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/* * copyright (c) 2001 Fabrice Bellard * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #ifndef AVCODEC_AVCODEC_H #define AVCODEC_AVCODEC_H /** * @file * @ingroup libavc * Libavcodec external API header */ #include "libavutil/samplefmt.h" #include "libavutil/attributes.h" #include "libavutil/avutil.h" #include "libavutil/buffer.h" #include "libavutil/channel_layout.h" #include "libavutil/dict.h" #include "libavutil/frame.h" #include "libavutil/log.h" #include "libavutil/pixfmt.h" #include "libavutil/rational.h" #include "codec.h" #include "codec_id.h" #include "defs.h" #include "packet.h" #include "version_major.h" #ifndef HAVE_AV_CONFIG_H /* When included as part of the ffmpeg build, only include the major version * to avoid unnecessary rebuilds. When included externally, keep including * the full version information. */ #include "version.h" #include "codec_desc.h" #include "codec_par.h" #endif struct AVCodecParameters; /** * @defgroup libavc libavcodec * Encoding/Decoding Library * * @{ * * @defgroup lavc_decoding Decoding * @{ * @} * * @defgroup lavc_encoding Encoding * @{ * @} * * @defgroup lavc_codec Codecs * @{ * @defgroup lavc_codec_native Native Codecs * @{ * @} * @defgroup lavc_codec_wrappers External library wrappers * @{ * @} * @defgroup lavc_codec_hwaccel Hardware Accelerators bridge * @{ * @} * @} * @defgroup lavc_internal Internal * @{ * @} * @} */ /** * @ingroup libavc * @defgroup lavc_encdec send/receive encoding and decoding API overview * @{ * * The avcodec_send_packet()/avcodec_receive_frame()/avcodec_send_frame()/ * avcodec_receive_packet() functions provide an encode/decode API, which * decouples input and output. * * The API is very similar for encoding/decoding and audio/video, and works as * follows: * - Set up and open the AVCodecContext as usual. * - Send valid input: * - For decoding, call avcodec_send_packet() to give the decoder raw * compressed data in an AVPacket. * - For encoding, call avcodec_send_frame() to give the encoder an AVFrame * containing uncompressed audio or video. * * In both cases, it is recommended that AVPackets and AVFrames are * refcounted, or libavcodec might have to copy the input data. (libavformat * always returns refcounted AVPackets, and av_frame_get_buffer() allocates * refcounted AVFrames.) * - Receive output in a loop. Periodically call one of the avcodec_receive_*() * functions and process their output: * - For decoding, call avcodec_receive_frame(). On success, it will return * an AVFrame containing uncompressed audio or video data. * - For encoding, call avcodec_receive_packet(). On success, it will return * an AVPacket with a compressed frame. * * Repeat this call until it returns AVERROR(EAGAIN) or an error. The * AVERROR(EAGAIN) return value means that new input data is required to * return new output. In this case, continue with sending input. For each * input frame/packet, the codec will typically return 1 output frame/packet, * but it can also be 0 or more than 1. * * At the beginning of decoding or encoding, the codec might accept multiple * input frames/packets without returning a frame, until its internal buffers * are filled. This situation is handled transparently if you follow the steps * outlined above. * * In theory, sending input can result in EAGAIN - this should happen only if * not all output was received. You can use this to structure alternative decode * or encode loops other than the one suggested above. For example, you could * try sending new input on each iteration, and try to receive output if that * returns EAGAIN. * * End of stream situations. These require "flushing" (aka draining) the codec, * as the codec might buffer multiple frames or packets internally for * performance or out of necessity (consider B-frames). * This is handled as follows: * - Instead of valid input, send NULL to the avcodec_send_packet() (decoding) * or avcodec_send_frame() (encoding) functions. This will enter draining * mode. * - Call avcodec_receive_frame() (decoding) or avcodec_receive_packet() * (encoding) in a loop until AVERROR_EOF is returned. The functions will * not return AVERROR(EAGAIN), unless you forgot to enter draining mode. * - Before decoding can be resumed again, the codec has to be reset with * avcodec_flush_buffers(). * * Using the API as outlined above is highly recommended. But it is also * possible to call functions outside of this rigid schema. For example, you can * call avcodec_send_packet() repeatedly without calling * avcodec_receive_frame(). In this case, avcodec_send_packet() will succeed * until the codec's internal buffer has been filled up (which is typically of * size 1 per output frame, after initial input), and then reject input with * AVERROR(EAGAIN). Once it starts rejecting input, you have no choice but to * read at least some output. * * Not all codecs will follow a rigid and predictable dataflow; the only * guarantee is that an AVERROR(EAGAIN) return value on a send/receive call on * one end implies that a receive/send call on the other end will succeed, or * at least will not fail with AVERROR(EAGAIN). In general, no codec will * permit unlimited buffering of input or output. * * A codec is not allowed to return AVERROR(EAGAIN) for both sending and receiving. This * would be an invalid state, which could put the codec user into an endless * loop. The API has no concept of time either: it cannot happen that trying to * do avcodec_send_packet() results in AVERROR(EAGAIN), but a repeated call 1 second * later accepts the packet (with no other receive/flush API calls involved). * The API is a strict state machine, and the passage of time is not supposed * to influence it. Some timing-dependent behavior might still be deemed * acceptable in certain cases. But it must never result in both send/receive * returning EAGAIN at the same time at any point. It must also absolutely be * avoided that the current state is "unstable" and can "flip-flop" between * the send/receive APIs allowing progress. For example, it's not allowed that * the codec randomly decides that it actually wants to consume a packet now * instead of returning a frame, after it just returned AVERROR(EAGAIN) on an * avcodec_send_packet() call. * @} */ /** * @defgroup lavc_core Core functions/structures. * @ingroup libavc * * Basic definitions, functions for querying libavcodec capabilities, * allocating core structures, etc. * @{ */ /** * @ingroup lavc_encoding */ typedef struct RcOverride{ int start_frame; int end_frame; int qscale; // If this is 0 then quality_factor will be used instead. float quality_factor; } RcOverride; /* encoding support These flags can be passed in AVCodecContext.flags before initialization. Note: Not everything is supported yet. */ /** * Allow decoders to produce frames with data planes that are not aligned * to CPU requirements (e.g. due to cropping). */ #define AV_CODEC_FLAG_UNALIGNED (1 << 0) /** * Use fixed qscale. */ #define AV_CODEC_FLAG_QSCALE (1 << 1) /** * 4 MV per MB allowed / advanced prediction for H.263. */ #define AV_CODEC_FLAG_4MV (1 << 2) /** * Output even those frames that might be corrupted. */ #define AV_CODEC_FLAG_OUTPUT_CORRUPT (1 << 3) /** * Use qpel MC. */ #define AV_CODEC_FLAG_QPEL (1 << 4) /** * Request the encoder to output reconstructed frames, i.e.\ frames that would * be produced by decoding the encoded bitstream. These frames may be retrieved * by calling avcodec_receive_frame() immediately after a successful call to * avcodec_receive_packet(). * * Should only be used with encoders flagged with the * @ref AV_CODEC_CAP_ENCODER_RECON_FRAME capability. * * @note * Each reconstructed frame returned by the encoder corresponds to the last * encoded packet, i.e. the frames are returned in coded order rather than * presentation order. * * @note * Frame parameters (like pixel format or dimensions) do not have to match the * AVCodecContext values. Make sure to use the values from the returned frame. */ #define AV_CODEC_FLAG_RECON_FRAME (1 << 6) /** * @par decoding * Request the decoder to propagate each packet's AVPacket.opaque and * AVPacket.opaque_ref to its corresponding output AVFrame. * * @par encoding: * Request the encoder to propagate each frame's AVFrame.opaque and * AVFrame.opaque_ref values to its corresponding output AVPacket. * * @par * May only be set on encoders that have the * @ref AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE capability flag. * * @note * While in typical cases one input frame produces exactly one output packet * (perhaps after a delay), in general the mapping of frames to packets is * M-to-N, so * - Any number of input frames may be associated with any given output packet. * This includes zero - e.g. some encoders may output packets that carry only * metadata about the whole stream. * - A given input frame may be associated with any number of output packets. * Again this includes zero - e.g. some encoders may drop frames under certain * conditions. * . * This implies that when using this flag, the caller must NOT assume that * - a given input frame's opaques will necessarily appear on some output packet; * - every output packet will have some non-NULL opaque value. * . * When an output packet contains multiple frames, the opaque values will be * taken from the first of those. * * @note * The converse holds for decoders, with frames and packets switched. */ #define AV_CODEC_FLAG_COPY_OPAQUE (1 << 7) /** * Signal to the encoder that the values of AVFrame.duration are valid and * should be used (typically for transferring them to output packets). * * If this flag is not set, frame durations are ignored. */ #define AV_CODEC_FLAG_FRAME_DURATION (1 << 8) /** * Use internal 2pass ratecontrol in first pass mode. */ #define AV_CODEC_FLAG_PASS1 (1 << 9) /** * Use internal 2pass ratecontrol in second pass mode. */ #define AV_CODEC_FLAG_PASS2 (1 << 10) /** * loop filter. */ #define AV_CODEC_FLAG_LOOP_FILTER (1 << 11) /** * Only decode/encode grayscale. */ #define AV_CODEC_FLAG_GRAY (1 << 13) /** * error[?] variables will be set during encoding. */ #define AV_CODEC_FLAG_PSNR (1 << 15) /** * Use interlaced DCT. */ #define AV_CODEC_FLAG_INTERLACED_DCT (1 << 18) /** * Force low delay. */ #define AV_CODEC_FLAG_LOW_DELAY (1 << 19) /** * Place global headers in extradata instead of every keyframe. */ #define AV_CODEC_FLAG_GLOBAL_HEADER (1 << 22) /** * Use only bitexact stuff (except (I)DCT). */ #define AV_CODEC_FLAG_BITEXACT (1 << 23) /* Fx : Flag for H.263+ extra options */ /** * H.263 advanced intra coding / MPEG-4 AC prediction */ #define AV_CODEC_FLAG_AC_PRED (1 << 24) /** * interlaced motion estimation */ #define AV_CODEC_FLAG_INTERLACED_ME (1 << 29) #define AV_CODEC_FLAG_CLOSED_GOP (1U << 31) /** * Allow non spec compliant speedup tricks. */ #define AV_CODEC_FLAG2_FAST (1 << 0) /** * Skip bitstream encoding. */ #define AV_CODEC_FLAG2_NO_OUTPUT (1 << 2) /** * Place global headers at every keyframe instead of in extradata. */ #define AV_CODEC_FLAG2_LOCAL_HEADER (1 << 3) /** * Input bitstream might be truncated at a packet boundaries * instead of only at frame boundaries. */ #define AV_CODEC_FLAG2_CHUNKS (1 << 15) /** * Discard cropping information from SPS. */ #define AV_CODEC_FLAG2_IGNORE_CROP (1 << 16) /** * Show all frames before the first keyframe */ #define AV_CODEC_FLAG2_SHOW_ALL (1 << 22) /** * Export motion vectors through frame side data */ #define AV_CODEC_FLAG2_EXPORT_MVS (1 << 28) /** * Do not skip samples and export skip information as frame side data */ #define AV_CODEC_FLAG2_SKIP_MANUAL (1 << 29) /** * Do not reset ASS ReadOrder field on flush (subtitles decoding) */ #define AV_CODEC_FLAG2_RO_FLUSH_NOOP (1 << 30) /** * Generate/parse ICC profiles on encode/decode, as appropriate for the type of * file. No effect on codecs which cannot contain embedded ICC profiles, or * when compiled without support for lcms2. */ #define AV_CODEC_FLAG2_ICC_PROFILES (1U << 31) /* Exported side data. These flags can be passed in AVCodecContext.export_side_data before initialization. */ /** * Export motion vectors through frame side data */ #define AV_CODEC_EXPORT_DATA_MVS (1 << 0) /** * Export encoder Producer Reference Time through packet side data */ #define AV_CODEC_EXPORT_DATA_PRFT (1 << 1) /** * Decoding only. * Export the AVVideoEncParams structure through frame side data. */ #define AV_CODEC_EXPORT_DATA_VIDEO_ENC_PARAMS (1 << 2) /** * Decoding only. * Do not apply film grain, export it instead. */ #define AV_CODEC_EXPORT_DATA_FILM_GRAIN (1 << 3) /** * Decoding only. * Do not apply picture enhancement layers, export them instead. */ #define AV_CODEC_EXPORT_DATA_ENHANCEMENTS (1 << 4) /** * The decoder will keep a reference to the frame and may reuse it later. */ #define AV_GET_BUFFER_FLAG_REF (1 << 0) /** * The encoder will keep a reference to the packet and may reuse it later. */ #define AV_GET_ENCODE_BUFFER_FLAG_REF (1 << 0) /** * The decoder will bypass frame threading and return the next frame as soon as * possible. Note that this may deliver frames earlier than the advertised * `AVCodecContext.delay`. No effect when frame threading is disabled, or on * encoding. */ #define AV_CODEC_RECEIVE_FRAME_FLAG_SYNCHRONOUS (1 << 0) /** * main external API structure. * New fields can be added to the end with minor version bumps. * Removal, reordering and changes to existing fields require a major * version bump. * You can use AVOptions (av_opt* / av_set/get*()) to access these fields from user * applications. * The name string for AVOptions options matches the associated command line * parameter name and can be found in libavcodec/options_table.h * The AVOption/command line parameter names differ in some cases from the C * structure field names for historic reasons or brevity. * sizeof(AVCodecContext) must not be used outside libav*. */ typedef struct AVCodecContext { /** * information on struct for av_log * - set by avcodec_alloc_context3 */ const AVClass *av_class; int log_level_offset; enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */ const struct AVCodec *codec; enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */ /** * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A'). * This is used to work around some encoder bugs. * A demuxer should set this to what is stored in the field used to identify the codec. * If there are multiple such fields in a container then the demuxer should choose the one * which maximizes the information about the used codec. * If the codec tag field in a container is larger than 32 bits then the demuxer should * remap the longer ID to 32 bits with a table or other structure. Alternatively a new * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated * first. * - encoding: Set by user, if not then the default based on codec_id will be used. * - decoding: Set by user, will be converted to uppercase by libavcodec during init. */ unsigned int codec_tag; void *priv_data; /** * Private context used for internal data. * * Unlike priv_data, this is not codec-specific. It is used in general * libavcodec functions. */ struct AVCodecInternal *internal; /** * Private data of the user, can be used to carry app specific stuff. * - encoding: Set by user. * - decoding: Set by user. */ void *opaque; /** * the average bitrate * - encoding: Set by user; unused for constant quantizer encoding. * - decoding: Set by user, may be overwritten by libavcodec * if this info is available in the stream */ int64_t bit_rate; /** * AV_CODEC_FLAG_*. * - encoding: Set by user. * - decoding: Set by user. */ int flags; /** * AV_CODEC_FLAG2_* * - encoding: Set by user. * - decoding: Set by user. */ int flags2; /** * Out-of-band global headers that may be used by some codecs. * * - decoding: Should be set by the caller when available (typically from a * demuxer) before opening the decoder; some decoders require this to be * set and will fail to initialize otherwise. * * The array must be allocated with the av_malloc() family of functions; * allocated size must be at least AV_INPUT_BUFFER_PADDING_SIZE bytes * larger than extradata_size. * * - encoding: May be set by the encoder in avcodec_open2() (possibly * depending on whether the AV_CODEC_FLAG_GLOBAL_HEADER flag is set). * * After being set, the array is owned by the codec and freed in * avcodec_free_context(). */ uint8_t *extradata; int extradata_size; /** * This is the fundamental unit of time (in seconds) in terms * of which frame timestamps are represented. For fixed-fps content, * timebase should be 1/framerate and timestamp increments should be * identically 1. * This often, but not always is the inverse of the frame rate or field rate * for video. 1/time_base is not the average frame rate if the frame rate is not * constant. * * Like containers, elementary streams also can store timestamps, 1/time_base * is the unit in which these timestamps are specified. * As example of such codec time base see ISO/IEC 14496-2:2001(E) * vop_time_increment_resolution and fixed_vop_rate * (fixed_vop_rate == 0 implies that it is different from the framerate) * * - encoding: MUST be set by user. * - decoding: unused. */ AVRational time_base; /** * Timebase in which pkt_dts/pts and AVPacket.dts/pts are expressed. * - encoding: unused. * - decoding: set by user. */ AVRational pkt_timebase; /** * - decoding: For codecs that store a framerate value in the compressed * bitstream, the decoder may export it here. { 0, 1} when * unknown. * - encoding: May be used to signal the framerate of CFR content to an * encoder. */ AVRational framerate; /** * Codec delay. * * Encoding: Number of frames delay there will be from the encoder input to * the decoder output. (we assume the decoder matches the spec) * Decoding: Number of frames delay in addition to what a standard decoder * as specified in the spec would produce. * * Video: * Number of frames the decoded output will be delayed relative to the * encoded input. * * Audio: * For encoding, this field is unused (see initial_padding). * * For decoding, this is the number of samples the decoder needs to * output before the decoder's output is valid. When seeking, you should * start decoding this many samples prior to your desired seek point. * * - encoding: Set by libavcodec. * - decoding: Set by libavcodec. */ int delay; /* video only */ /** * picture width / height. * * @note Those fields may not match the values of the last * AVFrame output by avcodec_receive_frame() due frame * reordering. * * - encoding: MUST be set by user. * - decoding: May be set by the user before opening the decoder if known e.g. * from the container. Some decoders will require the dimensions * to be set by the caller. During decoding, the decoder may * overwrite those values as required while parsing the data. */ int width, height; /** * Bitstream width / height, may be different from width/height e.g. when * the decoded frame is cropped before being output or lowres is enabled. * * @note Those field may not match the value of the last * AVFrame output by avcodec_receive_frame() due frame * reordering. * * - encoding: unused * - decoding: May be set by the user before opening the decoder if known * e.g. from the container. During decoding, the decoder may * overwrite those values as required while parsing the data. */ int coded_width, coded_height; /** * sample aspect ratio (0 if unknown) * That is the width of a pixel divided by the height of the pixel. * Numerator and denominator must be relatively prime and smaller than 256 for some video standa * - encoding: Set by user. * - decoding: Set by libavcodec. */ AVRational sample_aspect_ratio; /** * Pixel format, see AV_PIX_FMT_xxx. * May be set by the demuxer if known from headers. * May be overridden by the decoder if it knows better. * * @note This field may not match the value of the last * AVFrame output by avcodec_receive_frame() due frame * reordering. * * - encoding: Set by user. * - decoding: Set by user if known, overridden by libavcodec while * parsing the data. */ enum AVPixelFormat pix_fmt; /** * Nominal unaccelerated pixel format, see AV_PIX_FMT_xxx. * - encoding: unused. * - decoding: Set by libavcodec before calling get_format() */ enum AVPixelFormat sw_pix_fmt; /** * Chromaticity coordinates of the source primaries. * - encoding: Set by user * - decoding: Set by libavcodec */ enum AVColorPrimaries color_primaries; /** * Color Transfer Characteristic. * - encoding: Set by user * - decoding: Set by libavcodec */ enum AVColorTransferCharacteristic color_trc; /** * YUV colorspace type. * - encoding: Set by user * - decoding: Set by libavcodec */ enum AVColorSpace colorspace; /** * MPEG vs JPEG YUV range. * - encoding: Set by user to override the default output color range value, * If not specified, libavcodec sets the color range depending on the * output format. * - decoding: Set by libavcodec, can be set by the user to propagate the * color range to components reading from the decoder context. */ enum AVColorRange color_range; /** * This defines the location of chroma samples. * - encoding: Set by user * - decoding: Set by libavcodec */ enum AVChromaLocation chroma_sample_location; /** Field order * - encoding: set by libavcodec * - decoding: Set by user. */ enum AVFieldOrder field_order; /** * number of reference frames * - encoding: Set by user. * - decoding: Set by lavc. */ int refs; /** * Size of the frame reordering buffer in the decoder. * For MPEG-2 it is 1 IPB or 0 low delay IP. * - encoding: Set by libavcodec. * - decoding: Set by libavcodec. */ int has_b_frames; /** * slice flags * - encoding: unused * - decoding: Set by user. */ int slice_flags; #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order inste #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a tim /** * If non NULL, 'draw_horiz_band' is called by the libavcodec * decoder to draw a horizontal band. It improves cache usage. Not * all codecs can do that. You must check the codec capabilities * beforehand. * When multithreading is used, it may be called from multiple threads * at the same time; threads might draw different parts of the same AVFrame, * or multiple AVFrames, and there is no guarantee that slices will be drawn * in order. * The function is also used by hardware acceleration APIs. * It is called at least once during frame decoding to pass * the data needed for hardware render. * In that mode instead of pixel data, AVFrame points to * a structure specific to the acceleration API. The application * reads the structure and can change some fields to indicate progress * or mark state. * - encoding: unused * - decoding: Set by user. * @param height the height of the slice * @param y the y position of the slice * @param type 1->top field, 2->bottom field, 3->frame * @param offset offset into the AVFrame.data from which the slice should be read */ void (*draw_horiz_band)(struct AVCodecContext *s, const AVFrame *src, int offset[AV_NUM_DATA_POINTERS], int y, int type, int height); /** * Callback to negotiate the pixel format. Decoding only, may be set by the * caller before avcodec_open2(). * * Called by some decoders to select the pixel format that will be used for * the output frames. This is mainly used to set up hardware acceleration, * then the provided format list contains the corresponding hwaccel pixel * formats alongside the "software" one. The software pixel format may also * be retrieved from \ref sw_pix_fmt. * * This callback will be called when the coded frame properties (such as * resolution, pixel format, etc.) change and more than one output format is * supported for those new properties. If a hardware pixel format is chosen * and initialization for it fails, the callback may be called again * immediately. * * This callback may be called from different threads if the decoder is * multi-threaded, but not from more than one thread simultaneously. * * @param fmt list of formats which may be used in the current * configuration, terminated by AV_PIX_FMT_NONE. * @warning Behavior is undefined if the callback returns a value other * than one of the formats in fmt or AV_PIX_FMT_NONE. * @return the chosen format or AV_PIX_FMT_NONE */ enum AVPixelFormat (*get_format)(struct AVCodecContext *s, const enum AVPixelFormat * fmt /** * maximum number of B-frames between non-B-frames * Note: The output will be delayed by max_b_frames+1 relative to the input. * - encoding: Set by user. * - decoding: unused */ int max_b_frames; /** * qscale factor between IP and B-frames * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset). * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset). * - encoding: Set by user. * - decoding: unused */ float b_quant_factor; /** * qscale offset between IP and B-frames * - encoding: Set by user. * - decoding: unused */ float b_quant_offset; /** * qscale factor between P- and I-frames * If > 0 then the last P-frame quantizer will be used (q = lastp_q * factor + offset). * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset). * - encoding: Set by user. * - decoding: unused */ float i_quant_factor; /** * qscale offset between P and I-frames * - encoding: Set by user. * - decoding: unused */ float i_quant_offset; /** * luminance masking (0-> disabled) * - encoding: Set by user. * - decoding: unused */ float lumi_masking; /** * temporary complexity masking (0-> disabled) * - encoding: Set by user. * - decoding: unused */ float temporal_cplx_masking; /** * spatial complexity masking (0-> disabled) * - encoding: Set by user. * - decoding: unused */ float spatial_cplx_masking; /** * p block masking (0-> disabled) * - encoding: Set by user. * - decoding: unused */ float p_masking; /** * darkness masking (0-> disabled) * - encoding: Set by user. * - decoding: unused */ float dark_masking; /** * noise vs. sse weight for the nsse comparison function * - encoding: Set by user. * - decoding: unused */ int nsse_weight; /** * motion estimation comparison function * - encoding: Set by user. * - decoding: unused */ int me_cmp; /** * subpixel motion estimation comparison function * - encoding: Set by user. * - decoding: unused */ int me_sub_cmp; /** * macroblock comparison function (not supported yet) * - encoding: Set by user. * - decoding: unused */ int mb_cmp; /** * interlaced DCT comparison function * - encoding: Set by user. * - decoding: unused */ int ildct_cmp; #define FF_CMP_SAD 0 #define FF_CMP_SSE 1 #define FF_CMP_SATD 2 #define FF_CMP_DCT 3 #define FF_CMP_PSNR 4 #define FF_CMP_BIT 5 #define FF_CMP_RD 6 #define FF_CMP_ZERO 7 #define FF_CMP_VSAD 8 #define FF_CMP_VSSE 9 #define FF_CMP_NSSE 10 #define FF_CMP_W53 11 #define FF_CMP_W97 12 #define FF_CMP_DCTMAX 13 #define FF_CMP_DCT264 14 #define FF_CMP_MEDIAN_SAD 15 #define FF_CMP_CHROMA 256 /** * ME diamond size & shape * - encoding: Set by user. * - decoding: unused */ int dia_size; /** * amount of previous MV predictors (2a+1 x 2a+1 square) * - encoding: Set by user. * - decoding: unused */ int last_predictor_count; /** * motion estimation prepass comparison function * - encoding: Set by user. * - decoding: unused */ int me_pre_cmp; /** * ME prepass diamond size & shape * - encoding: Set by user. * - decoding: unused */ int pre_dia_size; /** * subpel ME quality * - encoding: Set by user. * - decoding: unused */ int me_subpel_quality; /** * maximum motion estimation search range in subpel units * If 0 then no limit. * * - encoding: Set by user. * - decoding: unused */ int me_range; /** * macroblock decision mode * - encoding: Set by user. * - decoding: unused */ int mb_decision; #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits #define FF_MB_DECISION_RD 2 ///< rate distortion /** * custom intra quantization matrix * Must be allocated with the av_malloc() family of functions, and will be freed in * avcodec_free_context(). * - encoding: Set/allocated by user, freed by libavcodec. Can be NULL. * - decoding: Set/allocated/freed by libavcodec. */ uint16_t *intra_matrix; /** * custom inter quantization matrix * Must be allocated with the av_malloc() family of functions, and will be freed in * avcodec_free_context(). * - encoding: Set/allocated by user, freed by libavcodec. Can be NULL. * - decoding: Set/allocated/freed by libavcodec. */ uint16_t *inter_matrix; /** * custom intra quantization matrix * - encoding: Set by user, can be NULL. * - decoding: unused. */ uint16_t *chroma_intra_matrix; #if FF_API_INTRA_DC_PRECISION /** * precision of the intra DC coefficient - 8 * - encoding: Set by user. * - decoding: Set by libavcodec * @deprecated Use the MPEG-2 encoder's private option "intra_dc_precision" instead. */ attribute_deprecated int intra_dc_precision; #endif /** * minimum MB Lagrange multiplier * - encoding: Set by user. * - decoding: unused */ int mb_lmin; /** * maximum MB Lagrange multiplier * - encoding: Set by user. * - decoding: unused */ int mb_lmax; /** * - encoding: Set by user. * - decoding: unused */ int bidir_refine; /** * minimum GOP size * - encoding: Set by user. * - decoding: unused */ int keyint_min; /** * the number of pictures in a group of pictures, or 0 for intra_only * - encoding: Set by user. * - decoding: unused */ int gop_size; /** * Note: Value depends upon the compare function used for fullpel ME. * - encoding: Set by user. * - decoding: unused */ int mv0_threshold; /** * Number of slices. * Indicates number of picture subdivisions. Used for parallelized * decoding. * - encoding: Set by user * - decoding: unused */ int slices; /* audio only */ int sample_rate; ///< samples per second /** * audio sample format * - encoding: Set by user. * - decoding: Set by libavcodec. */ enum AVSampleFormat sample_fmt; ///< sample format /** * Audio channel layout. * - encoding: must be set by the caller, to one of AVCodec.ch_layouts. * - decoding: may be set by the caller if known e.g. from the container. * The decoder can then override during decoding as needed. */ AVChannelLayout ch_layout; /* The following data should not be initialized. */ /** * Number of samples per channel in an audio frame. * * - encoding: set by libavcodec in avcodec_open2(). Each submitted frame * except the last must contain exactly frame_size samples per channel. * May be 0 when the codec has AV_CODEC_CAP_VARIABLE_FRAME_SIZE set, then the * frame size is not restricted. * - decoding: may be set by some decoders to indicate constant frame size */ int frame_size; /** * number of bytes per packet if constant and known or 0 * Used by some WAV based audio codecs. */ int block_align; /** * Audio cutoff bandwidth (0 means "automatic") * - encoding: Set by user. * - decoding: unused */ int cutoff; /** * Type of service that the audio stream conveys. * - encoding: Set by user. * - decoding: Set by libavcodec. */ enum AVAudioServiceType audio_service_type; /** * desired sample format * - encoding: Not used. * - decoding: Set by user. * Decoder will decode to this format if it can. */ enum AVSampleFormat request_sample_fmt; /** * Audio only. The number of "priming" samples (padding) inserted by the * encoder at the beginning of the audio. I.e. this number of leading * decoded samples must be discarded by the caller to get the original audio * without leading padding. * * - decoding: unused * - encoding: Set by libavcodec. The timestamps on the output packets are * adjusted by the encoder so that they always refer to the * first sample of the data actually contained in the packet, * including any added padding. E.g. if the timebase is * 1/samplerate and the timestamp of the first input sample is * 0, the timestamp of the first output packet will be * -initial_padding. */ int initial_padding; /** * Audio only. The amount of padding (in samples) appended by the encoder to * the end of the audio. I.e. this number of decoded samples must be * discarded by the caller from the end of the stream to get the original * audio without any trailing padding. * * - decoding: unused * - encoding: unused */ int trailing_padding; /** * Number of samples to skip after a discontinuity * - decoding: unused * - encoding: set by libavcodec */ int seek_preroll; /** * This callback is called at the beginning of each frame to get data * buffer(s) for it. There may be one contiguous buffer for all the data or * there may be a buffer per each data plane or anything in between. What * this means is, you may set however many entries in buf[] you feel necessary. * Each buffer must be reference-counted using the AVBuffer API (see description * of buf[] below). * * The following fields will be set in the frame before this callback is * called: * - format * - width, height (video only) * - sample_rate, channel_layout, nb_samples (audio only) * Their values may differ from the corresponding values in * AVCodecContext. This callback must use the frame values, not the codec * context values, to calculate the required buffer size. * * This callback must fill the following fields in the frame: * - data[] * - linesize[] * - extended_data: * * if the data is planar audio with more than 8 channels, then this * callback must allocate and fill extended_data to contain all pointers * to all data planes. data[] must hold as many pointers as it can. * extended_data must be allocated with av_malloc() and will be freed in * av_frame_unref(). * * otherwise extended_data must point to data * - buf[] must contain one or more pointers to AVBufferRef structures. Each of * the frame's data and extended_data pointers must be contained in these. That * is, one AVBufferRef for each allocated chunk of memory, not necessarily one * AVBufferRef per data[] entry. See: av_buffer_create(), av_buffer_alloc(), * and av_buffer_ref(). * - extended_buf and nb_extended_buf must be allocated with av_malloc() by * this callback and filled with the extra buffers if there are more * buffers than buf[] can hold. extended_buf will be freed in * av_frame_unref(). * Decoders will generally initialize the whole buffer before it is output * but it can in rare error conditions happen that uninitialized data is passed * through. \important The buffers returned by get_buffer* should thus not contain sensitive * data. * * If AV_CODEC_CAP_DR1 is not set then get_buffer2() must call * avcodec_default_get_buffer2() instead of providing buffers allocated by * some other means. * * Each data plane must be aligned to the maximum required by the target * CPU. * * @see avcodec_default_get_buffer2() * * Video: * * If AV_GET_BUFFER_FLAG_REF is set in flags then the frame may be reused * (read and/or written to if it is writable) later by libavcodec. * * avcodec_align_dimensions2() should be used to find the required width and * height, as they normally need to be rounded up to the next multiple of 16. * * Some decoders do not support linesizes changing between frames. * * If frame multithreading is used, this callback may be called from a * different thread, but not from more than one at once. Does not need to be * reentrant. * * @see avcodec_align_dimensions2() * * Audio: * * Decoders request a buffer of a particular size by setting * AVFrame.nb_samples prior to calling get_buffer2(). The decoder may, * however, utilize only part of the buffer by setting AVFrame.nb_samples * to a smaller value in the output frame. * * As a convenience, av_samples_get_buffer_size() and * av_samples_fill_arrays() in libavutil may be used by custom get_buffer2() * functions to find the required data size and to fill data pointers and * linesize. In AVFrame.linesize, only linesize[0] may be set for audio * since all planes must be the same size. * * @see av_samples_get_buffer_size(), av_samples_fill_arrays() * * - encoding: unused * - decoding: Set by libavcodec, user can override. */ int (*get_buffer2)(struct AVCodecContext *s, AVFrame *frame, int flags); /* - encoding parameters */ /** * number of bits the bitstream is allowed to diverge from the reference. * the reference can be CBR (for CBR pass1) or VBR (for pass2) * - encoding: Set by user; unused for constant quantizer encoding. * - decoding: unused */ int bit_rate_tolerance; /** * Global quality for codecs which cannot change it per frame. * This should be proportional to MPEG-1/2/4 qscale. * - encoding: Set by user. * - decoding: unused */ int global_quality; /** * - encoding: Set by user. * - decoding: unused */ int compression_level; #define FF_COMPRESSION_DEFAULT -1 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0) float qblur; ///< amount of qscale smoothing over time (0.0-1.0) /** * minimum quantizer * - encoding: Set by user. * - decoding: unused */ int qmin; /** * maximum quantizer * - encoding: Set by user. * - decoding: unused */ int qmax; /** * maximum quantizer difference between frames * - encoding: Set by user. * - decoding: unused */ int max_qdiff; /** * decoder bitstream buffer size * - encoding: Set by user. * - decoding: May be set by libavcodec. */ int rc_buffer_size; /** * ratecontrol override, see RcOverride * - encoding: Allocated/set/freed by user. * - decoding: unused */ int rc_override_count; RcOverride *rc_override; /** * maximum bitrate * - encoding: Set by user. * - decoding: Set by user, may be overwritten by libavcodec. */ int64_t rc_max_rate; /** * minimum bitrate * - encoding: Set by user. * - decoding: unused */ int64_t rc_min_rate; /** * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow. * - encoding: Set by user. * - decoding: unused. */ float rc_max_available_vbv_use; /** * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow. * - encoding: Set by user. * - decoding: unused. */ float rc_min_vbv_overflow_use; /** * Number of bits which should be loaded into the rc buffer before decoding starts. * - encoding: Set by user. * - decoding: unused */ int rc_initial_buffer_occupancy; /** * trellis RD quantization * - encoding: Set by user. * - decoding: unused */ int trellis; /** * pass1 encoding statistics output buffer * - encoding: Set by libavcodec. * - decoding: unused */ char *stats_out; /** * pass2 encoding statistics input buffer * Concatenated stuff from stats_out of pass1 should be placed here. * - encoding: Allocated/set/freed by user. * - decoding: unused */ char *stats_in; /** * Work around bugs in encoders which sometimes cannot be detected automatically. * - encoding: Set by user * - decoding: Set by user */ int workaround_bugs; #define FF_BUG_AUTODETECT 1 ///< autodetection #define FF_BUG_XVID_ILACE 4 #define FF_BUG_UMP4 8 #define FF_BUG_NO_PADDING 16 #define FF_BUG_AMV 32 #define FF_BUG_QPEL_CHROMA 64 #define FF_BUG_STD_QPEL 128 #define FF_BUG_QPEL_CHROMA2 256 #define FF_BUG_DIRECT_BLOCKSIZE 512 #define FF_BUG_EDGE 1024 #define FF_BUG_HPEL_CHROMA 2048 #define FF_BUG_DC_CLIP 4096 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders. #define FF_BUG_TRUNCATED 16384 #define FF_BUG_IEDGE 32768 /** * strictly follow the standard (MPEG-4, ...). * - encoding: Set by user. * - decoding: Set by user. * Setting this to STRICT or higher means the encoder and decoder will * generally do stupid things, whereas setting it to unofficial or lower * will mean the encoder might produce output that is not supported by all * spec-compliant decoders. Decoders don't differentiate between normal, * unofficial and experimental (that is, they always try to decode things * when they can) unless they are explicitly asked to behave stupidly * (=strictly conform to the specs) * This may only be set to one of the FF_COMPLIANCE_* values in defs.h. */ int strict_std_compliance; /** * error concealment flags * - encoding: unused * - decoding: Set by user. */ int error_concealment; #define FF_EC_GUESS_MVS 1 #define FF_EC_DEBLOCK 2 #define FF_EC_FAVOR_INTER 256 /** * debug * - encoding: Set by user. * - decoding: Set by user. */ int debug; #define FF_DEBUG_PICT_INFO 1 #define FF_DEBUG_RC 2 #define FF_DEBUG_BITSTREAM 4 #define FF_DEBUG_MB_TYPE 8 #define FF_DEBUG_QP 16 #define FF_DEBUG_DCT_COEFF 0x00000040 #define FF_DEBUG_SKIP 0x00000080 #define FF_DEBUG_STARTCODE 0x00000100 #define FF_DEBUG_ER 0x00000400 #define FF_DEBUG_MMCO 0x00000800 #define FF_DEBUG_BUGS 0x00001000 #define FF_DEBUG_BUFFERS 0x00008000 #define FF_DEBUG_THREADS 0x00010000 #define FF_DEBUG_GREEN_MD 0x00800000 #define FF_DEBUG_NOMC 0x01000000 /** * Error recognition; may misdetect some more or less valid parts as errors. * This is a bitfield of the AV_EF_* values defined in defs.h. * * - encoding: Set by user. * - decoding: Set by user. */ int err_recognition; /** * Hardware accelerator in use * - encoding: unused. * - decoding: Set by libavcodec */ const struct AVHWAccel *hwaccel; /** * Legacy hardware accelerator context. * * For some hardware acceleration methods, the caller may use this field to * signal hwaccel-specific data to the codec. The struct pointed to by this * pointer is hwaccel-dependent and defined in the respective header. Please * refer to the FFmpeg HW accelerator documentation to know how to fill * this. * * In most cases this field is optional - the necessary information may also * be provided to libavcodec through @ref hw_frames_ctx or @ref * hw_device_ctx (see avcodec_get_hw_config()). However, in some cases it * may be the only method of signalling some (optional) information. * * The struct and its contents are owned by the caller. * * - encoding: May be set by the caller before avcodec_open2(). Must remain * valid until avcodec_free_context(). * - decoding: May be set by the caller in the get_format() callback. * Must remain valid until the next get_format() call, * or avcodec_free_context() (whichever comes first). */ void *hwaccel_context; /** * A reference to the AVHWFramesContext describing the input (for encoding) * or output (decoding) frames. The reference is set by the caller and * afterwards owned (and freed) by libavcodec - it should never be read by * the caller after being set. * * - decoding: This field should be set by the caller from the get_format() * callback. The previous reference (if any) will always be * unreffed by libavcodec before the get_format() call. * * If the default get_buffer2() is used with a hwaccel pixel * format, then this AVHWFramesContext will be used for * allocating the frame buffers. * * - encoding: For hardware encoders configured to use a hwaccel pixel * format, this field should be set by the caller to a reference * to the AVHWFramesContext describing input frames. * AVHWFramesContext.format must be equal to * AVCodecContext.pix_fmt. * * This field should be set before avcodec_open2() is called. */ AVBufferRef *hw_frames_ctx; /** * A reference to the AVHWDeviceContext describing the device which will * be used by a hardware encoder/decoder. The reference is set by the * caller and afterwards owned (and freed) by libavcodec. * * This should be used if either the codec device does not require * hardware frames or any that are used are to be allocated internally by * libavcodec. If the user wishes to supply any of the frames used as * encoder input or decoder output then hw_frames_ctx should be used * instead. When hw_frames_ctx is set in get_format() for a decoder, this * field will be ignored while decoding the associated stream segment, but * may again be used on a following one after another get_format() call. * * For both encoders and decoders this field should be set before * avcodec_open2() is called and must not be written to thereafter. * * Note that some decoders may require this field to be set initially in * order to support hw_frames_ctx at all - in that case, all frames * contexts used must be created on the same device. */ AVBufferRef *hw_device_ctx; /** * Bit set of AV_HWACCEL_FLAG_* flags, which affect hardware accelerated * decoding (if active). * - encoding: unused * - decoding: Set by user (either before avcodec_open2(), or in the * AVCodecContext.get_format callback) */ int hwaccel_flags; /** * Video decoding only. Sets the number of extra hardware frames which * the decoder will allocate for use by the caller. This must be set * before avcodec_open2() is called. * * Some hardware decoders require all frames that they will use for * output to be defined in advance before decoding starts. For such * decoders, the hardware frame pool must therefore be of a fixed size. * The extra frames set here are on top of any number that the decoder * needs internally in order to operate normally (for example, frames * used as reference pictures). */ int extra_hw_frames; /** * error * - encoding: Set by libavcodec if flags & AV_CODEC_FLAG_PSNR. * - decoding: unused */ uint64_t error[AV_NUM_DATA_POINTERS]; /** * DCT algorithm, see FF_DCT_* below * - encoding: Set by user. * - decoding: unused */ int dct_algo; #define FF_DCT_AUTO 0 #define FF_DCT_FASTINT 1 #define FF_DCT_INT 2 #define FF_DCT_MMX 3 #define FF_DCT_ALTIVEC 5 #define FF_DCT_FAAN 6 #define FF_DCT_NEON 7 /** * IDCT algorithm, see FF_IDCT_* below. * - encoding: Set by user. * - decoding: Set by user. */ int idct_algo; #define FF_IDCT_AUTO 0 #define FF_IDCT_INT 1 #define FF_IDCT_SIMPLE 2 #define FF_IDCT_SIMPLEMMX 3 #define FF_IDCT_ARM 7 #define FF_IDCT_ALTIVEC 8 #define FF_IDCT_SIMPLEARM 10 #define FF_IDCT_XVID 14 #define FF_IDCT_SIMPLEARMV5TE 16 #define FF_IDCT_SIMPLEARMV6 17 #define FF_IDCT_FAAN 20 #define FF_IDCT_SIMPLENEON 22 #define FF_IDCT_SIMPLEAUTO 128 /** * bits per sample/pixel from the demuxer (needed for huffyuv). * - encoding: Set by libavcodec. * - decoding: Set by user. */ int bits_per_coded_sample; /** * Bits per sample/pixel of internal libavcodec pixel/sample format. * - encoding: set by user. * - decoding: set by libavcodec. */ int bits_per_raw_sample; /** * thread count * is used to decide how many independent tasks should be passed to execute() * - encoding: Set by user. * - decoding: Set by user. */ int thread_count; /** * Which multithreading methods to use. * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread, * so clients which cannot provide future frames should not use it. * * - encoding: Set by user, otherwise the default is used. * - decoding: Set by user, otherwise the default is used. */ int thread_type; #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once /** * Which multithreading methods are in use by the codec. * - encoding: Set by libavcodec. * - decoding: Set by libavcodec. */ int active_thread_type; /** * The codec may call this to execute several independent things. * It will return only after finishing all tasks. * The user may replace this with some multithreaded implementation, * the default implementation will execute the parts serially. * @param count the number of things to execute * - encoding: Set by libavcodec, user can override. * - decoding: Set by libavcodec, user can override. */ int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg /** * The codec may call this to execute several independent things. * It will return only after finishing all tasks. * The user may replace this with some multithreaded implementation, * the default implementation will execute the parts serially. * @param c context passed also to func * @param count the number of things to execute * @param arg2 argument passed unchanged to func * @param ret return values of executed functions, must have space for "count" values. May be NUL * @param func function that will be called count times, with jobnr from 0 to count-1. * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no * two instances of func executing at the same time will have the same threadnr. * @return always 0 currently, but code should handle a future improvement where when any call to * returns < 0 no further calls to func may be done and < 0 is returned. * - encoding: Set by libavcodec, user can override. * - decoding: Set by libavcodec, user can override. */ int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *ar /** * profile * - encoding: Set by user. * - decoding: Set by libavcodec. * See the AV_PROFILE_* defines in defs.h. */ int profile; /** * Encoding level descriptor. * - encoding: Set by user, corresponds to a specific level defined by the * codec, usually corresponding to the profile level, if not specified it * is set to AV_LEVEL_UNKNOWN. * - decoding: Set by libavcodec. * See AV_LEVEL_* in defs.h. */ int level; #if FF_API_CODEC_PROPS /** * Properties of the stream that gets decoded * - encoding: unused * - decoding: set by libavcodec */ attribute_deprecated unsigned properties; #define FF_CODEC_PROPERTY_LOSSLESS 0x00000001 #define FF_CODEC_PROPERTY_CLOSED_CAPTIONS 0x00000002 #define FF_CODEC_PROPERTY_FILM_GRAIN 0x00000004 #endif /** * Skip loop filtering for selected frames. * - encoding: unused * - decoding: Set by user. */ enum AVDiscard skip_loop_filter; /** * Skip IDCT/dequantization for selected frames. * - encoding: unused * - decoding: Set by user. */ enum AVDiscard skip_idct; /** * Skip decoding for selected frames. * - encoding: unused * - decoding: Set by user. */ enum AVDiscard skip_frame; /** * Skip processing alpha if supported by codec. * Note that if the format uses pre-multiplied alpha (common with VP6, * and recommended due to better video quality/compression) * the image will look as if alpha-blended onto a black background. * However for formats that do not use pre-multiplied alpha * there might be serious artefacts (though e.g. libswscale currently * assumes pre-multiplied alpha anyway). * * - decoding: set by user * - encoding: unused */ int skip_alpha; /** * Number of macroblock rows at the top which are skipped. * - encoding: unused * - decoding: Set by user. */ int skip_top; /** * Number of macroblock rows at the bottom which are skipped. * - encoding: unused * - decoding: Set by user. */ int skip_bottom; /** * low resolution decoding, 1-> 1/2 size, 2->1/4 size * - encoding: unused * - decoding: Set by user. */ int lowres; /** * AVCodecDescriptor * - encoding: unused. * - decoding: set by libavcodec. */ const struct AVCodecDescriptor *codec_descriptor; /** * Character encoding of the input subtitles file. * - decoding: set by user * - encoding: unused */ char *sub_charenc; /** * Subtitles character encoding mode. Formats or codecs might be adjusting * this setting (if they are doing the conversion themselves for instance). * - decoding: set by libavcodec * - encoding: unused */ int sub_charenc_mode; #define FF_SUB_CHARENC_MODE_DO_NOTHING -1 ///< do nothing (demuxer outputs a stream suppose #define FF_SUB_CHARENC_MODE_AUTOMATIC 0 ///< libavcodec will select the mode itself #define FF_SUB_CHARENC_MODE_PRE_DECODER 1 ///< the AVPacket data needs to be recoded to UTF-8 #define FF_SUB_CHARENC_MODE_IGNORE 2 ///< neither convert the subtitles, nor check them for v /** * Header containing style information for text subtitles. * For SUBTITLE_ASS subtitle type, it should contain the whole ASS * [Script Info] and [V4+ Styles] section, plus the [Events] line and * the Format line following. It shouldn't include any Dialogue line. * * - encoding: May be set by the caller before avcodec_open2() to an array * allocated with the av_malloc() family of functions. * - decoding: May be set by libavcodec in avcodec_open2(). * * After being set, the array is owned by the codec and freed in * avcodec_free_context(). */ int subtitle_header_size; uint8_t *subtitle_header; /** * dump format separator. * can be ", " or "\n " or anything else * - encoding: Set by user. * - decoding: Set by user. */ uint8_t *dump_separator; /** * ',' separated list of allowed decoders. * If NULL then all are allowed * - encoding: unused * - decoding: set by user */ char *codec_whitelist; /** * Additional data associated with the entire coded stream. * * - decoding: may be set by user before calling avcodec_open2(). * - encoding: may be set by libavcodec after avcodec_open2(). */ AVPacketSideData *coded_side_data; int nb_coded_side_data; /** * Bit set of AV_CODEC_EXPORT_DATA_* flags, which affects the kind of * metadata exported in frame, packet, or coded stream side data by * decoders and encoders. * * - decoding: set by user * - encoding: set by user */ int export_side_data; /** * The number of pixels per image to maximally accept. * * - decoding: set by user * - encoding: set by user */ int64_t max_pixels; /** * Video decoding only. Certain video codecs support cropping, meaning that * only a sub-rectangle of the decoded frame is intended for display. This * option controls how cropping is handled by libavcodec. * * When set to 1 (the default), libavcodec will apply cropping internally. * I.e. it will modify the output frame width/height fields and offset the * data pointers (only by as much as possible while preserving alignment, or * by the full amount if the AV_CODEC_FLAG_UNALIGNED flag is set) so that * the frames output by the decoder refer only to the cropped area. The * crop_* fields of the output frames will be zero. * * When set to 0, the width/height fields of the output frames will be set * to the coded dimensions and the crop_* fields will describe the cropping * rectangle. Applying the cropping is left to the caller. * * @warning When hardware acceleration with opaque output frames is used, * libavcodec is unable to apply cropping from the top/left border. * * @note when this option is set to zero, the width/height fields of the * AVCodecContext and output AVFrames have different meanings. The codec * context fields store display dimensions (with the coded dimensions in * coded_width/height), while the frame fields store the coded dimensions * (with the display dimensions being determined by the crop_* fields). */ int apply_cropping; /** * The percentage of damaged samples to discard a frame. * * - decoding: set by user * - encoding: unused */ int discard_damaged_percentage; /** * The number of samples per frame to maximally accept. * * - decoding: set by user * - encoding: set by user */ int64_t max_samples; /** * This callback is called at the beginning of each packet to get a data * buffer for it. * * The following field will be set in the packet before this callback is * called: * - size * This callback must use the above value to calculate the required buffer size, * which must padded by at least AV_INPUT_BUFFER_PADDING_SIZE bytes. * * In some specific cases, the encoder may not use the entire buffer allocated by this * callback. This will be reflected in the size value in the packet once returned by * avcodec_receive_packet(). * * This callback must fill the following fields in the packet: * - data: alignment requirements for AVPacket apply, if any. Some architectures and * encoders may benefit from having aligned data. * - buf: must contain a pointer to an AVBufferRef structure. The packet's * data pointer must be contained in it. See: av_buffer_create(), av_buffer_alloc(), * and av_buffer_ref(). * * If AV_CODEC_CAP_DR1 is not set then get_encode_buffer() must call * avcodec_default_get_encode_buffer() instead of providing a buffer allocated by * some other means. * * The flags field may contain a combination of AV_GET_ENCODE_BUFFER_FLAG_ flags. * They may be used for example to hint what use the buffer may get after being * created. * Implementations of this callback may ignore flags they don't understand. * If AV_GET_ENCODE_BUFFER_FLAG_REF is set in flags then the packet may be reused * (read and/or written to if it is writable) later by libavcodec. * * This callback must be thread-safe, as when frame threading is used, it may * be called from multiple threads simultaneously. * * @see avcodec_default_get_encode_buffer() * * - encoding: Set by libavcodec, user can override. * - decoding: unused */ int (*get_encode_buffer)(struct AVCodecContext *s, AVPacket *pkt, int flags); /** * Frame counter, set by libavcodec. * * - decoding: total number of frames returned from the decoder so far. * - encoding: total number of frames passed to the encoder so far. * * @note the counter is not incremented if encoding/decoding resulted in * an error. */ int64_t frame_num; /** * Decoding only. May be set by the caller before avcodec_open2() to an * av_malloc()'ed array (or via AVOptions). Owned and freed by the decoder * afterwards. * * Side data attached to decoded frames may come from several sources: * 1. coded_side_data, which the decoder will for certain types translate * from packet-type to frame-type and attach to frames; * 2. side data attached to an AVPacket sent for decoding (same * considerations as above); * 3. extracted from the coded bytestream. * The first two cases are supplied by the caller and typically come from a * container. * * This array configures decoder behaviour in cases when side data of the * same type is present both in the coded bytestream and in the * user-supplied side data (items 1. and 2. above). In all cases, at most * one instance of each side data type will be attached to output frames. By * default it will be the bytestream side data. Adding an * AVPacketSideDataType value to this array will flip the preference for * this type, thus making the decoder prefer user-supplied side data over * bytestream. In case side data of the same type is present both in * coded_data and attacked to a packet, the packet instance always has * priority. * * The array may also contain a single -1, in which case the preference is * switched for all side data types. */ int *side_data_prefer_packet; /** * Number of entries in side_data_prefer_packet. */ unsigned nb_side_data_prefer_packet; /** * Array containing static side data, such as HDR10 CLL / MDCV structures. * Side data entries should be allocated by usage of helpers defined in * libavutil/frame.h. * * - encoding: may be set by user before calling avcodec_open2() for * encoder configuration. Afterwards owned and freed by the * encoder. * - decoding: may be set by libavcodec in avcodec_open2(). */ AVFrameSideData **decoded_side_data; int nb_decoded_side_data; /** * Indicates how the alpha channel of the video is represented. * - encoding: Set by user * - decoding: Set by libavcodec */ enum AVAlphaMode alpha_mode; int moz_extradata_offset; void* moz_ndk_crypto; } AVCodecContext; /** * @defgroup lavc_hwaccel AVHWAccel * * @note Nothing in this structure should be accessed by the user. At some * point in future it will not be externally visible at all. * * @{ */ typedef struct AVHWAccel { /** * Name of the hardware accelerated codec. * The name is globally unique among encoders and among decoders (but an * encoder and a decoder can share the same name). */ const char *name; /** * Type of codec implemented by the hardware accelerator. * * See AVMEDIA_TYPE_xxx */ enum AVMediaType type; /** * Codec implemented by the hardware accelerator. * * See AV_CODEC_ID_xxx */ enum AVCodecID id; /** * Supported pixel format. * * Only hardware accelerated formats are supported here. */ enum AVPixelFormat pix_fmt; /** * Hardware accelerated codec capabilities. * see AV_HWACCEL_CODEC_CAP_* */ int capabilities; } AVHWAccel; /** * HWAccel is experimental and is thus avoided in favor of non experimental * codecs */ #define AV_HWACCEL_CODEC_CAP_EXPERIMENTAL 0x0200 /** * Hardware acceleration should be used for decoding even if the codec level * used is unknown or higher than the maximum supported level reported by the * hardware driver. * * It's generally a good idea to pass this flag unless you have a specific * reason not to, as hardware tends to under-report supported levels. */ #define AV_HWACCEL_FLAG_IGNORE_LEVEL (1 << 0) /** * Hardware acceleration can output YUV pixel formats with a different chroma * sampling than 4:2:0 and/or other than 8 bits per component. */ #define AV_HWACCEL_FLAG_ALLOW_HIGH_DEPTH (1 << 1) /** * Hardware acceleration should still be attempted for decoding when the * codec profile does not match the reported capabilities of the hardware. * * For example, this can be used to try to decode baseline profile H.264 * streams in hardware - it will often succeed, because many streams marked * as baseline profile actually conform to constrained baseline profile. * * @warning If the stream is actually not supported then the behaviour is * undefined, and may include returning entirely incorrect output * while indicating success. */ #define AV_HWACCEL_FLAG_ALLOW_PROFILE_MISMATCH (1 << 2) /** * Some hardware decoders (namely nvdec) can either output direct decoder * surfaces, or make an on-device copy and return said copy. * There is a hard limit on how many decoder surfaces there can be, and it * cannot be accurately guessed ahead of time. * For some processing chains, this can be okay, but others will run into the * limit and in turn produce very confusing errors that require fine tuning of * more or less obscure options by the user, or in extreme cases cannot be * resolved at all without inserting an avfilter that forces a copy. * * Thus, the hwaccel will by default make a copy for safety and resilience. * If a users really wants to minimize the amount of copies, they can set this * flag and ensure their processing chain does not exhaust the surface pool. */ #define AV_HWACCEL_FLAG_UNSAFE_OUTPUT (1 << 3) /** * @} */ enum AVSubtitleType { SUBTITLE_NONE, SUBTITLE_BITMAP, ///< A bitmap, pict will be set /** * Plain text, the text field must be set by the decoder and is * authoritative. ass and pict fields may contain approximations. */ SUBTITLE_TEXT, /** * Formatted text, the ass field must be set by the decoder and is * authoritative. pict and text fields may contain approximations. */ SUBTITLE_ASS, }; #define AV_SUBTITLE_FLAG_FORCED 0x00000001 typedef struct AVSubtitleRect { int x; ///< top left corner of pict, undefined when pict is not set int y; ///< top left corner of pict, undefined when pict is not set int w; ///< width of pict, undefined when pict is not set int h; ///< height of pict, undefined when pict is not set int nb_colors; ///< number of colors in pict, undefined when pict is not set /** * data+linesize for the bitmap of this subtitle. * Can be set for text/ass as well once they are rendered. */ uint8_t *data[4]; int linesize[4]; int flags; enum AVSubtitleType type; char *text; ///< 0 terminated plain UTF-8 text /** * 0 terminated ASS/SSA compatible event line. * The presentation of this is unaffected by the other values in this * struct. */ char *ass; } AVSubtitleRect; typedef struct AVSubtitle { uint16_t format; /* 0 = graphics */ uint32_t start_display_time; /* relative to packet pts, in ms */ uint32_t end_display_time; /* relative to packet pts, in ms */ unsigned num_rects; AVSubtitleRect **rects; int64_t pts; ///< Same as packet pts, in AV_TIME_BASE } AVSubtitle; /** * Return the LIBAVCODEC_VERSION_INT constant. */ unsigned avcodec_version(void); /** * Return the libavcodec build-time configuration. */ const char *avcodec_configuration(void); /** * Return the libavcodec license. */ const char *avcodec_license(void); /** * Allocate an AVCodecContext and set its fields to default values. The * resulting struct should be freed with avcodec_free_context(). * * @param codec if non-NULL, allocate private data and initialize defaults * for the given codec. It is illegal to then call avcodec_open2() * with a different codec. * If NULL, then the codec-specific defaults won't be initialized, * which may result in suboptimal default settings (this is * important mainly for encoders, e.g. libx264). * * @return An AVCodecContext filled with default values or NULL on failure. */ AVCodecContext *avcodec_alloc_context3(const AVCodec *codec); /** * Free the codec context and everything associated with it and write NULL to * the provided pointer. */ void avcodec_free_context(AVCodecContext **avctx); /** * Get the AVClass for AVCodecContext. It can be used in combination with * AV_OPT_SEARCH_FAKE_OBJ for examining options. * * @see av_opt_find(). */ const AVClass *avcodec_get_class(void); /** * Get the AVClass for AVSubtitleRect. It can be used in combination with * AV_OPT_SEARCH_FAKE_OBJ for examining options. * * @see av_opt_find(). */ const AVClass *avcodec_get_subtitle_rect_class(void); /** * Fill the parameters struct based on the values from the supplied codec * context. Any allocated fields in par are freed and replaced with duplicates * of the corresponding fields in codec. * * @return >= 0 on success, a negative AVERROR code on failure */ int avcodec_parameters_from_context(struct AVCodecParameters *par, const AVCodecContext *codec); /** * Fill the codec context based on the values from the supplied codec * parameters. Any allocated fields in codec that have a corresponding field in * par are freed and replaced with duplicates of the corresponding field in par. * Fields in codec that do not have a counterpart in par are not touched. * * @return >= 0 on success, a negative AVERROR code on failure. */ int avcodec_parameters_to_context(AVCodecContext *codec, const struct AVCodecParameters *par); /** * Initialize the AVCodecContext to use the given AVCodec. Prior to using this * function the context has to be allocated with avcodec_alloc_context3(). * * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(), * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for * retrieving a codec. * * Depending on the codec, you might need to set options in the codec context * also for decoding (e.g. width, height, or the pixel or audio sample format in * the case the information is not available in the bitstream, as when decoding * raw audio or video). * * Options in the codec context can be set either by setting them in the options * AVDictionary, or by setting the values in the context itself, directly or by * using the av_opt_set() API before calling this function. * * Example: * @code * av_dict_set(&opts, "b", "2.5M", 0); * codec = avcodec_find_decoder(AV_CODEC_ID_H264); * if (!codec) * exit(1); * * context = avcodec_alloc_context3(codec); * * if (avcodec_open2(context, codec, opts) < 0) * exit(1); * @endcode * * In the case AVCodecParameters are available (e.g. when demuxing a stream * using libavformat, and accessing the AVStream contained in the demuxer), the * codec parameters can be copied to the codec context using * avcodec_parameters_to_context(), as in the following example: * * @code * AVStream *stream = ...; * context = avcodec_alloc_context3(codec); * if (avcodec_parameters_to_context(context, stream->codecpar) < 0) * exit(1); * if (avcodec_open2(context, codec, NULL) < 0) * exit(1); * @endcode * * @note Always call this function before using decoding routines (such as * @ref avcodec_receive_frame()). * * @param avctx The context to initialize. * @param codec The codec to open this context for. If a non-NULL codec has been * previously passed to avcodec_alloc_context3() or * for this context, then this parameter MUST be either NULL or * equal to the previously passed codec. * @param options A dictionary filled with AVCodecContext and codec-private * options, which are set on top of the options already set in * avctx, can be NULL. On return this object will be filled with * options that were not found in the avctx codec context. * * @return zero on success, a negative value on error * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(), * av_dict_set(), av_opt_set(), av_opt_find(), avcodec_parameters_to_context() */ int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options); /** * Free all allocated data in the given subtitle struct. * * @param sub AVSubtitle to free. */ void avsubtitle_free(AVSubtitle *sub); /** * @} */ /** * @addtogroup lavc_decoding * @{ */ /** * The default callback for AVCodecContext.get_buffer2(). It is made public so * it can be called by custom get_buffer2() implementations for decoders without * AV_CODEC_CAP_DR1 set. */ int avcodec_default_get_buffer2(AVCodecContext *s, AVFrame *frame, int flags); /** * The default callback for AVCodecContext.get_encode_buffer(). It is made public so * it can be called by custom get_encode_buffer() implementations for encoders without * AV_CODEC_CAP_DR1 set. */ int avcodec_default_get_encode_buffer(AVCodecContext *s, AVPacket *pkt, int flags); /** * Modify width and height values so that they will result in a memory * buffer that is acceptable for the codec if you do not use any horizontal * padding. * * May only be used if a codec with AV_CODEC_CAP_DR1 has been opened. */ void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height); /** * Modify width and height values so that they will result in a memory * buffer that is acceptable for the codec if you also ensure that all * line sizes are a multiple of the respective linesize_align[i]. * * May only be used if a codec with AV_CODEC_CAP_DR1 has been opened. */ void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height, int linesize_align[AV_NUM_DATA_POINTERS]); /** * Decode a subtitle message. * Return a negative value on error, otherwise return the number of bytes used. * If no subtitle could be decompressed, got_sub_ptr is zero. * Otherwise, the subtitle is stored in *sub. * Note that AV_CODEC_CAP_DR1 is not available for subtitle codecs. This is for * simplicity, because the performance difference is expected to be negligible * and reusing a get_buffer written for video codecs would probably perform badly * due to a potentially very different allocation pattern. * * Some decoders (those marked with AV_CODEC_CAP_DELAY) have a delay between input * and output. This means that for some packets they will not immediately * produce decoded output and need to be flushed at the end of decoding to get * all the decoded data. Flushing is done by calling this function with packets * with avpkt->data set to NULL and avpkt->size set to 0 until it stops * returning subtitles. It is safe to flush even those decoders that are not * marked with AV_CODEC_CAP_DELAY, then no subtitles will be returned. * * @note The AVCodecContext MUST have been opened with @ref avcodec_open2() * before packets may be fed to the decoder. * * @param avctx the codec context * @param[out] sub The preallocated AVSubtitle in which the decoded subtitle will be stored, * must be freed with avsubtitle_free if *got_sub_ptr is set. * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonz * @param[in] avpkt The input AVPacket containing the input buffer. */ int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub, int *got_sub_ptr, const AVPacket *avpkt); /** * Supply raw packet data as input to a decoder. * * Internally, this call will copy relevant AVCodecContext fields, which can * influence decoding per-packet, and apply them when the packet is actually * decoded. (For example AVCodecContext.skip_frame, which might direct the * decoder to drop the frame contained by the packet sent with this function.) * * @warning The input buffer, avpkt->data must be AV_INPUT_BUFFER_PADDING_SIZE * larger than the actual read bytes because some optimized bitstream * readers read 32 or 64 bits at once and could read over the end. * * @note The AVCodecContext MUST have been opened with @ref avcodec_open2() * before packets may be fed to the decoder. * * @param avctx codec context * @param[in] avpkt The input AVPacket. Usually, this will be a single video * frame, or several complete audio frames. * Ownership of the packet remains with the caller, and the * decoder will not write to the packet. The decoder may create * a reference to the packet data (or copy it if the packet is * not reference-counted). * Unlike with older APIs, the packet is always fully consumed, * and if it contains multiple frames (e.g. some audio codecs), * will require you to call avcodec_receive_frame() multiple * times afterwards before you can send a new packet. * It can be NULL (or an AVPacket with data set to NULL and * size set to 0); in this case, it is considered a flush * packet, which signals the end of the stream. Sending the * first flush packet will return success. Subsequent ones are * unnecessary and will return AVERROR_EOF. If the decoder * still has frames buffered, it will return them after sending * a flush packet. * * @retval 0 success * @retval AVERROR(EAGAIN) input is not accepted in the current state - user * must read output with avcodec_receive_frame() (once * all output is read, the packet should be resent, * and the call will not fail with EAGAIN). * @retval AVERROR_EOF the decoder has been flushed, and no new packets can be * sent to it (also returned if more than 1 flush * packet is sent) * @retval AVERROR(EINVAL) codec not opened, it is an encoder, or requires flush * @retval AVERROR(ENOMEM) failed to add packet to internal queue, or similar * @retval "another negative error code" legitimate decoding errors */ int avcodec_send_packet(AVCodecContext *avctx, const AVPacket *avpkt); /** * Return decoded output data from a decoder or encoder (when the * @ref AV_CODEC_FLAG_RECON_FRAME flag is used). * * @param avctx codec context * @param frame This will be set to a reference-counted video or audio * frame (depending on the decoder type) allocated by the * codec. Note that the function will always call * av_frame_unref(frame) before doing anything else. * @param flags Combination of AV_CODEC_RECEIVE_FRAME_FLAG_* flags. * * @retval 0 success, a frame was returned * @retval AVERROR(EAGAIN) output is not available in this state - user must * try to send new input * @retval AVERROR_EOF the codec has been fully flushed, and there will be * no more output frames * @retval AVERROR(EINVAL) codec not opened, or it is an encoder without the * @ref AV_CODEC_FLAG_RECON_FRAME flag enabled * @retval "other negative error code" legitimate decoding errors */ int avcodec_receive_frame_flags(AVCodecContext *avctx, AVFrame *frame, unsigned flags) /** * Alias for `avcodec_receive_frame_flags(avctx, frame, 0)`. */ int avcodec_receive_frame(AVCodecContext *avctx, AVFrame *frame); /** * Supply a raw video or audio frame to the encoder. Use avcodec_receive_packet() * to retrieve buffered output packets. * * @param avctx codec context * @param[in] frame AVFrame containing the raw audio or video frame to be encoded. * Ownership of the frame remains with the caller, and the * encoder will not write to the frame. The encoder may create * a reference to the frame data (or copy it if the frame is * not reference-counted). * It can be NULL, in which case it is considered a flush * packet. This signals the end of the stream. If the encoder * still has packets buffered, it will return them after this * call. Once flushing mode has been entered, additional flush * packets are ignored, and sending frames will return * AVERROR_EOF. * * For audio: * If AV_CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame * can have any number of samples. * If it is not set, frame->nb_samples must be equal to * avctx->frame_size for all frames except the last. * The final frame may be smaller than avctx->frame_size. * @retval 0 success * @retval AVERROR(EAGAIN) input is not accepted in the current state - user must * read output with avcodec_receive_packet() (once all * output is read, the packet should be resent, and the * call will not fail with EAGAIN). * @retval AVERROR_EOF the encoder has been flushed, and no new frames can * be sent to it * @retval AVERROR(EINVAL) codec not opened, it is a decoder, or requires flush * @retval AVERROR(ENOMEM) failed to add packet to internal queue, or similar * @retval "another negative error code" legitimate encoding errors */ int avcodec_send_frame(AVCodecContext *avctx, const AVFrame *frame); /** * Read encoded data from the encoder. * * @param avctx codec context * @param avpkt This will be set to a reference-counted packet allocated by the * encoder. Note that the function will always call * av_packet_unref(avpkt) before doing anything else. * @retval 0 success * @retval AVERROR(EAGAIN) output is not available in the current state - user must * try to send input * @retval AVERROR_EOF the encoder has been fully flushed, and there will be no * more output packets * @retval AVERROR(EINVAL) codec not opened, or it is a decoder * @retval "another negative error code" legitimate encoding errors */ int avcodec_receive_packet(AVCodecContext *avctx, AVPacket *avpkt); /** * Create and return a AVHWFramesContext with values adequate for hardware * decoding. This is meant to get called from the get_format callback, and is * a helper for preparing a AVHWFramesContext for AVCodecContext.hw_frames_ctx. * This API is for decoding with certain hardware acceleration modes/APIs only. * * The returned AVHWFramesContext is not initialized. The caller must do this * with av_hwframe_ctx_init(). * * Calling this function is not a requirement, but makes it simpler to avoid * codec or hardware API specific details when manually allocating frames. * * Alternatively to this, an API user can set AVCodecContext.hw_device_ctx, * which sets up AVCodecContext.hw_frames_ctx fully automatically, and makes * it unnecessary to call this function or having to care about * AVHWFramesContext initialization at all. * * There are a number of requirements for calling this function: * * - It must be called from get_format with the same avctx parameter that was * passed to get_format. Calling it outside of get_format is not allowed, and * can trigger undefined behavior. * - The function is not always supported (see description of return values). * Even if this function returns successfully, hwaccel initialization could * fail later. (The degree to which implementations check whether the stream * is actually supported varies. Some do this check only after the user's * get_format callback returns.) * - The hw_pix_fmt must be one of the choices suggested by get_format. If the * user decides to use a AVHWFramesContext prepared with this API function, * the user must return the same hw_pix_fmt from get_format. * - The device_ref passed to this function must support the given hw_pix_fmt. * - After calling this API function, it is the user's responsibility to * initialize the AVHWFramesContext (returned by the out_frames_ref parameter), * and to set AVCodecContext.hw_frames_ctx to it. If done, this must be done * before returning from get_format (this is implied by the normal * AVCodecContext.hw_frames_ctx API rules). * - The AVHWFramesContext parameters may change every time time get_format is * called. Also, AVCodecContext.hw_frames_ctx is reset before get_format. So * you are inherently required to go through this process again on every * get_format call. * - It is perfectly possible to call this function without actually using * the resulting AVHWFramesContext. One use-case might be trying to reuse a * previously initialized AVHWFramesContext, and calling this API function * only to test whether the required frame parameters have changed. * - Fields that use dynamically allocated values of any kind must not be set * by the user unless setting them is explicitly allowed by the documentation. * If the user sets AVHWFramesContext.free and AVHWFramesContext.user_opaque, * the new free callback must call the potentially set previous free callback. * This API call may set any dynamically allocated fields, including the free * callback. * * The function will set at least the following fields on AVHWFramesContext * (potentially more, depending on hwaccel API): * * - All fields set by av_hwframe_ctx_alloc(). * - Set the format field to hw_pix_fmt. * - Set the sw_format field to the most suited and most versatile format. (An * implication is that this will prefer generic formats over opaque formats * with arbitrary restrictions, if possible.) * - Set the width/height fields to the coded frame size, rounded up to the * API-specific minimum alignment. * - Only _if_ the hwaccel requires a pre-allocated pool: set the initial_pool_size * field to the number of maximum reference surfaces possible with the codec, * plus 1 surface for the user to work (meaning the user can safely reference * at most 1 decoded surface at a time), plus additional buffering introduced * by frame threading. If the hwaccel does not require pre-allocation, the * field is left to 0, and the decoder will allocate new surfaces on demand * during decoding. * - Possibly AVHWFramesContext.hwctx fields, depending on the underlying * hardware API. * * Essentially, out_frames_ref returns the same as av_hwframe_ctx_alloc(), but * with basic frame parameters set. * * The function is stateless, and does not change the AVCodecContext or the * device_ref AVHWDeviceContext. * * @param avctx The context which is currently calling get_format, and which * implicitly contains all state needed for filling the returned * AVHWFramesContext properly. * @param device_ref A reference to the AVHWDeviceContext describing the device * which will be used by the hardware decoder. * @param hw_pix_fmt The hwaccel format you are going to return from get_format. * @param out_frames_ref On success, set to a reference to an _uninitialized_ * AVHWFramesContext, created from the given device_ref. * Fields will be set to values required for decoding. * Not changed if an error is returned. * @return zero on success, a negative value on error. The following error codes * have special semantics: * AVERROR(ENOENT): the decoder does not support this functionality. Setup * is always manual, or it is a decoder which does not * support setting AVCodecContext.hw_frames_ctx at all, * or it is a software format. * AVERROR(EINVAL): it is known that hardware decoding is not supported for * this configuration, or the device_ref is not supported * for the hwaccel referenced by hw_pix_fmt. */ int avcodec_get_hw_frames_parameters(AVCodecContext *avctx, AVBufferRef *device_ref, enum AVPixelFormat hw_pix_fmt, AVBufferRef **out_frames_ref); enum AVCodecConfig { AV_CODEC_CONFIG_PIX_FORMAT, ///< AVPixelFormat, terminated by AV_PIX_FMT_NONE AV_CODEC_CONFIG_FRAME_RATE, ///< AVRational, terminated by {0, 0} AV_CODEC_CONFIG_SAMPLE_RATE, ///< int, terminated by 0 AV_CODEC_CONFIG_SAMPLE_FORMAT, ///< AVSampleFormat, terminated by AV_SAMPLE_FMT_NONE AV_CODEC_CONFIG_CHANNEL_LAYOUT, ///< AVChannelLayout, terminated by {0} AV_CODEC_CONFIG_COLOR_RANGE, ///< AVColorRange, terminated by AVCOL_RANGE_UNSPECIFIED AV_CODEC_CONFIG_COLOR_SPACE, ///< AVColorSpace, terminated by AVCOL_SPC_UNSPECIFIED AV_CODEC_CONFIG_ALPHA_MODE, ///< AVAlphaMode, terminated by AVALPHA_MODE_UNSPECIFIED }; /** * Retrieve a list of all supported values for a given configuration type. * * @param avctx An optional context to use. Values such as * `strict_std_compliance` may affect the result. If NULL, * default values are used. * @param codec The codec to query, or NULL to use avctx->codec. * @param config The configuration to query. * @param flags Currently unused; should be set to zero. * @param out_configs On success, set to a list of configurations, terminated * by a config-specific terminator, or NULL if all * possible values are supported. * @param out_num_configs On success, set to the number of elements in *out_configs, excluding the terminator. Optional. */ int avcodec_get_supported_config(const AVCodecContext *avctx, const AVCodec *codec, enum AVCodecConfig config, unsigned flags, const void **out_configs, int *out_num_configs); /** * @defgroup lavc_parsing Frame parsing * @{ */ enum AVPictureStructure { AV_PICTURE_STRUCTURE_UNKNOWN, ///< unknown AV_PICTURE_STRUCTURE_TOP_FIELD, ///< coded as top field AV_PICTURE_STRUCTURE_BOTTOM_FIELD, ///< coded as bottom field AV_PICTURE_STRUCTURE_FRAME, ///< coded as frame }; typedef struct AVCodecParserContext { void *priv_data; const struct AVCodecParser *parser; int64_t frame_offset; /* offset of the current frame */ int64_t cur_offset; /* current offset (incremented by each av_parser_parse()) */ int64_t next_frame_offset; /* offset of the next frame */ /* video info */ int pict_type; /* XXX: Put it back in AVCodecContext. */ /** * This field is used for proper frame duration computation in lavf. * It signals, how much longer the frame duration of the current frame * is compared to normal frame duration. * * frame_duration = (1 + repeat_pict) * time_base * * It is used by codecs like H.264 to display telecined material. */ int repeat_pict; /* XXX: Put it back in AVCodecContext. */ int64_t pts; /* pts of the current frame */ int64_t dts; /* dts of the current frame */ /* private data */ int64_t last_pts; int64_t last_dts; int fetch_timestamp; #define AV_PARSER_PTS_NB 4 int cur_frame_start_index; int64_t cur_frame_offset[AV_PARSER_PTS_NB]; int64_t cur_frame_pts[AV_PARSER_PTS_NB]; int64_t cur_frame_dts[AV_PARSER_PTS_NB]; int flags; #define PARSER_FLAG_COMPLETE_FRAMES 0x0001 #define PARSER_FLAG_ONCE 0x0002 /// Set if the parser has a valid file offset #define PARSER_FLAG_FETCHED_OFFSET 0x0004 #define PARSER_FLAG_USE_CODEC_TS 0x1000 int64_t offset; ///< byte offset from starting packet start int64_t cur_frame_end[AV_PARSER_PTS_NB]; /** * Set by parser to 1 for key frames and 0 for non-key frames. * It is initialized to -1, so if the parser doesn't set this flag, * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames * will be used. */ int key_frame; // Timestamp generation support: /** * Synchronization point for start of timestamp generation. * * Set to >0 for sync point, 0 for no sync point and <0 for undefined * (default). * * For example, this corresponds to presence of H.264 buffering period * SEI message. */ int dts_sync_point; /** * Offset of the current timestamp against last timestamp sync point in * units of AVCodecContext.time_base. * * Set to INT_MIN when dts_sync_point unused. Otherwise, it must * contain a valid timestamp offset. * * Note that the timestamp of sync point has usually a nonzero * dts_ref_dts_delta, which refers to the previous sync point. Offset of * the next frame after timestamp sync point will be usually 1. * * For example, this corresponds to H.264 cpb_removal_delay. */ int dts_ref_dts_delta; /** * Presentation delay of current frame in units of AVCodecContext.time_base. * * Set to INT_MIN when dts_sync_point unused. Otherwise, it must * contain valid non-negative timestamp delta (presentation time of a frame * must not lie in the past). * * This delay represents the difference between decoding and presentation * time of the frame. * * For example, this corresponds to H.264 dpb_output_delay. */ int pts_dts_delta; /** * Position of the packet in file. * * Analogous to cur_frame_pts/dts */ int64_t cur_frame_pos[AV_PARSER_PTS_NB]; /** * Byte position of currently parsed frame in stream. */ int64_t pos; /** * Previous frame byte position. */ int64_t last_pos; /** * Duration of the current frame. * For audio, this is in units of 1 / AVCodecContext.sample_rate. * For all other types, this is in units of AVCodecContext.time_base. */ int duration; enum AVFieldOrder field_order; /** * Indicate whether a picture is coded as a frame, top field or bottom field. * * For example, H.264 field_pic_flag equal to 0 corresponds to * AV_PICTURE_STRUCTURE_FRAME. An H.264 picture with field_pic_flag * equal to 1 and bottom_field_flag equal to 0 corresponds to * AV_PICTURE_STRUCTURE_TOP_FIELD. */ enum AVPictureStructure picture_structure; /** * Picture number incremented in presentation or output order. * This field may be reinitialized at the first picture of a new sequence. * * For example, this corresponds to H.264 PicOrderCnt. */ int output_picture_number; /** * Dimensions of the decoded video intended for presentation. */ int width; int height; /** * Dimensions of the coded video. */ int coded_width; int coded_height; /** * The format of the coded data, corresponds to enum AVPixelFormat for video * and for enum AVSampleFormat for audio. * * Note that a decoder can have considerable freedom in how exactly it * decodes the data, so the format reported here might be different from the * one returned by a decoder. */ int format; } AVCodecParserContext; typedef struct AVCodecParser { #if FF_API_PARSER_CODECID int codec_ids[7]; /* several codec IDs are permitted */ #else enum AVCodecID codec_ids[7]; /* several codec IDs are permitted */ #endif #if FF_API_PARSER_PRIVATE /***************************************************************** * All fields below this line are not part of the public API. They * may not be used outside of libavcodec and can be changed and * removed at will. * New public fields should be added right above. ***************************************************************** */ attribute_deprecated int priv_data_size; attribute_deprecated int (*parser_init)(AVCodecParserContext *s); /* This callback never returns an error, a negative value means that * the frame start was in a previous packet. */ attribute_deprecated int (*parser_parse)(AVCodecParserContext *s, AVCodecContext *avctx, const uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size); attribute_deprecated void (*parser_close)(AVCodecParserContext *s); attribute_deprecated int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size); #endif } AVCodecParser; /** * Iterate over all registered codec parsers. * * @param opaque a pointer where libavcodec will store the iteration state. Must * point to NULL to start the iteration. * * @return the next registered codec parser or NULL when the iteration is * finished */ const AVCodecParser *av_parser_iterate(void **opaque); #if FF_API_PARSER_CODECID AVCodecParserContext *av_parser_init(int codec_id); #else AVCodecParserContext *av_parser_init(enum AVCodecID codec_id); #endif /** * Parse a packet. * * @param s parser context. * @param avctx codec context. * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished. * @param poutbuf_size set to size of parsed buffer or zero if not yet finished. * @param buf input buffer. * @param buf_size buffer size in bytes without the padding. I.e. the full buffer size is assumed to be buf_size + AV_INPUT_BUFFER_PADDING_SIZE. To signal EOF, this should be 0 (so that the last frame can be output). * @param pts input presentation timestamp. * @param dts input decoding timestamp. * @param pos input byte position in stream. * @return the number of bytes of the input bitstream used. * * Example: * @code * while(in_len){ * len = av_parser_parse2(myparser, AVCodecContext, &data, &size, * in_data, in_len, * pts, dts, pos); * in_data += len; * in_len -= len; * * if(size) * decode_frame(data, size); * } * @endcode */ int av_parser_parse2(AVCodecParserContext *s, AVCodecContext *avctx, uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size, int64_t pts, int64_t dts, int64_t pos); void av_parser_close(AVCodecParserContext *s); /** * @} * @} */ /** * @addtogroup lavc_encoding * @{ */ int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size, const AVSubtitle *sub); /** * @} */ /** * @defgroup lavc_misc Utility functions * @ingroup libavc * * Miscellaneous utility functions related to both encoding and decoding * (or neither). * @{ */ /** * @defgroup lavc_misc_pixfmt Pixel formats * * Functions for working with pixel formats. * @{ */ /** * Return a value representing the fourCC code associated to the * pixel format pix_fmt, or 0 if no associated fourCC code can be * found. */ unsigned int avcodec_pix_fmt_to_codec_tag(enum AVPixelFormat pix_fmt); /** * Find the best pixel format to convert to given a certain source pixel * format. When converting from one pixel format to another, information loss * may occur. For example, when converting from RGB24 to GRAY, the color * information will be lost. Similarly, other losses occur when converting from * some formats to other formats. avcodec_find_best_pix_fmt_of_2() searches which of * the given pixel formats should be used to suffer the least amount of loss. * The pixel formats from which it chooses one, are determined by the * pix_fmt_list parameter. * * * @param[in] pix_fmt_list AV_PIX_FMT_NONE terminated array of pixel formats to choose from * @param[in] src_pix_fmt source pixel format * @param[in] has_alpha Whether the source pixel format alpha channel is used. * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur. * @return The best pixel format to convert to or -1 if none was found. */ enum AVPixelFormat avcodec_find_best_pix_fmt_of_list(const enum AVPixelFormat *pix_fm enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr); enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPi /** * @} */ void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode); int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *ar int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *a //FIXME func typedef /** * Fill AVFrame audio data and linesize pointers. * * The buffer buf must be a preallocated buffer with a size big enough * to contain the specified samples amount. The filled AVFrame data * pointers will point to this buffer. * * AVFrame extended_data channel pointers are allocated if necessary for * planar audio. * * @param frame the AVFrame * frame->nb_samples must be set prior to calling the * function. This function fills in frame->data, * frame->extended_data, frame->linesize[0]. * @param nb_channels channel count * @param sample_fmt sample format * @param buf buffer to use for frame data * @param buf_size size of buffer * @param align plane size sample alignment (0 = default) * @return >=0 on success, negative error code on failure * @todo return the size in bytes required to store the samples in * case of success, at the next libavutil bump */ int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels, enum AVSampleFormat sample_fmt, const uint8_t *buf, int buf_size, int align); /** * Reset the internal codec state / flush internal buffers. Should be called * e.g. when seeking or when switching to a different stream. * * @note for decoders, this function just releases any references the decoder * might keep internally, but the caller's references remain valid. * * @note for encoders, this function will only do something if the encoder * declares support for AV_CODEC_CAP_ENCODER_FLUSH. When called, the encoder * will drain any remaining packets, and can then be reused for a different * stream (as opposed to sending a null frame which will leave the encoder * in a permanent EOF state after draining). This can be desirable if the * cost of tearing down and replacing the encoder instance is high. */ void avcodec_flush_buffers(AVCodecContext *avctx); /** * Return audio frame duration. * * @param avctx codec context * @param frame_bytes size of the frame, or 0 if unknown * @return frame duration, in samples, if known. 0 if not able to * determine. */ int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes); /* memory */ /** * Same behaviour av_fast_malloc but the buffer has additional * AV_INPUT_BUFFER_PADDING_SIZE at the end which will always be 0. * * In addition the whole buffer will initially and after resizes * be 0-initialized so that no uninitialized data will ever appear. */ void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size); /** * Same behaviour av_fast_padded_malloc except that buffer will always * be 0-initialized after call. */ void av_fast_padded_mallocz(void *ptr, unsigned int *size, size_t min_size); /** * @return a positive value if s is open (i.e. avcodec_open2() was called on it), * 0 otherwise. */ int avcodec_is_open(AVCodecContext *s); /** * @} */ #endif /* AVCODEC_AVCODEC_H */
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2026-08-25