/* * Copyright (c) 2016, Alliance for Open Media. All rights reserved. * * This source code is subject to the terms of the BSD 2 Clause License and * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License * was not distributed with this source code in the LICENSE file, you can * obtain it at www.aomedia.org/license/software. If the Alliance for Open * Media Patent License 1.0 was not distributed with this source code in the * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
*/
/*! * \brief Contains coding block data required by the decoder. * * This includes: * - Coding block info that is common between encoder and decoder. * - Other coding block info only needed by the decoder. * Contrast this with a similar struct MACROBLOCK on encoder side. * This data is also common between ThreadData and AV1Decoder structs.
*/ typedefstruct DecoderCodingBlock { /*! * Coding block info that is common between encoder and decoder.
*/
DECLARE_ALIGNED(32, MACROBLOCKD, xd); /*! * True if the at least one of the coding blocks decoded was corrupted.
*/ int corrupted; /*! * Pointer to 'mc_buf' inside 'pbi->td' (single-threaded decoding) or * 'pbi->thread_data[i].td' (multi-threaded decoding).
*/
uint8_t *mc_buf[2]; /*! * Pointer to 'dqcoeff' inside 'td->cb_buffer_base' or 'pbi->cb_buffer_base' * with appropriate offset for the current superblock, for each plane.
*/
tran_low_t *dqcoeff_block[MAX_MB_PLANE]; /*! * cb_offset[p] is the offset into the dqcoeff_block[p] for the current coding * block, for each plane 'p'.
*/
uint16_t cb_offset[MAX_MB_PLANE]; /*! * Pointer to 'eob_data' inside 'td->cb_buffer_base' or 'pbi->cb_buffer_base' * with appropriate offset for the current superblock, for each plane.
*/
eob_info *eob_data[MAX_MB_PLANE]; /*! * txb_offset[p] is the offset into the eob_data[p] for the current coding * block, for each plane 'p'.
*/
uint16_t txb_offset[MAX_MB_PLANE]; /*! * ref_mv_count[i] specifies the number of number of motion vector candidates * in xd->ref_mv_stack[i].
*/
uint8_t ref_mv_count[MODE_CTX_REF_FRAMES];
} DecoderCodingBlock;
// Coding block buffer for the current superblock. // Used only for single-threaded decoding and multi-threaded decoding with // row_mt == 1 cases. // See also: similar buffer in 'AV1Decoder'.
CB_BUFFER cb_buffer_base;
aom_reader *bit_reader;
// Motion compensation buffer used to get a prediction buffer with extended // borders. One buffer for each of the two possible references.
uint8_t *mc_buf[2]; // Mask for this block used for compound prediction.
uint8_t *seg_mask; // Allocated size of 'mc_buf'.
int32_t mc_buf_size; // If true, the pointers in 'mc_buf' were converted from highbd pointers. int mc_buf_use_highbd; // Boolean: whether the byte pointers stored in // mc_buf were converted from highbd pointers.
typedefstruct AV1DecRowMTJobInfo { int tile_row; int tile_col; int mi_row;
} AV1DecRowMTJobInfo;
typedefstruct AV1DecRowMTSyncData { #if CONFIG_MULTITHREAD
pthread_mutex_t *mutex_;
pthread_cond_t *cond_; #endif int allocated_sb_rows; int *cur_sb_col; // Denotes the superblock interval at which conditional signalling should // happen. Also denotes the minimum number of extra superblocks of the top row // to be complete to start decoding the current superblock. A value of 1 // indicates top-right dependency. int sync_range; // Denotes the additional number of superblocks in the previous row to be // complete to start decoding the current superblock when intraBC tool is // enabled. This additional top-right delay is required to satisfy the // hardware constraints for intraBC tool when row multithreading is enabled. int intrabc_extra_top_right_sb_delay; int mi_rows; int mi_cols; int mi_rows_parse_done; int mi_rows_decode_started; int num_threads_working;
} AV1DecRowMTSync;
typedefstruct AV1DecRowMTInfo { int tile_rows_start; int tile_rows_end; int tile_cols_start; int tile_cols_end; int start_tile; int end_tile; int mi_rows_to_decode;
// Invariant: // mi_rows_parse_done >= mi_rows_decode_started. // mi_rows_parse_done and mi_rows_decode_started are both initialized to 0. // mi_rows_parse_done is incremented freely. mi_rows_decode_started may only // be incremented to catch up with mi_rows_parse_done but is not allowed to // surpass mi_rows_parse_done. // // When mi_rows_decode_started reaches mi_rows_to_decode, there are no more // decode jobs.
// Indicates the progress of the bit-stream parsing of superblocks. // Initialized to 0. Incremented by sb_mi_size when parse sb row is done. int mi_rows_parse_done; // Indicates the progress of the decoding of superblocks. // Initialized to 0. Incremented by sb_mi_size when decode sb row is started. int mi_rows_decode_started; // Boolean: Initialized to 0 (false). Set to 1 (true) on error to abort // decoding. int row_mt_exit;
} AV1DecRowMTInfo;
typedefstruct AV1DecTileMTData { #if CONFIG_MULTITHREAD
pthread_mutex_t *job_mutex; #endif
TileJobsDec *job_queue; int jobs_enqueued; int jobs_dequeued; int alloc_tile_rows; int alloc_tile_cols;
} AV1DecTileMT;
// Each time the decoder is called, we expect to receive a full temporal unit. // This can contain up to one shown frame per spatial layer in the current // operating point (note that some layers may be entirely omitted). // If the 'output_all_layers' option is true, we save all of these shown // frames so that they can be returned to the application. If the // 'output_all_layers' option is false, then we only output one image per // temporal unit. // // Note: The saved buffers are released at the start of the next time the // application calls aom_codec_decode(). int output_all_layers;
RefCntBuffer *output_frames[MAX_NUM_SPATIAL_LAYERS];
size_t num_output_frames; // How many frames are queued up so far?
// In order to properly support random-access decoding, we need // to behave slightly differently for the very first frame we decode. // So we track whether this is the first frame or not. int decoding_first_frame;
int allow_lowbitdepth; int max_threads; int inv_tile_order; int need_resync; // wait for key/intra-only frame. int reset_decoder_state;
int tile_size_bytes; int tile_col_size_bytes; int dec_tile_row, dec_tile_col; // always -1 for non-VR tile encoding #if CONFIG_ACCOUNTING int acct_enabled;
Accounting accounting; #endif int sequence_header_ready; int sequence_header_changed; #if CONFIG_INSPECTION
aom_inspect_cb inspect_cb; void *inspect_ctx; #endif int operating_point; int current_operating_point; int seen_frame_header; // The expected start_tile (tg_start syntax element) of the next tile group. int next_start_tile;
// State if the camera frame header is already decoded while // large_scale_tile = 1. int camera_frame_header_ready;
size_t frame_header_size;
DataBuffer obu_size_hdr; int output_frame_width_in_tiles_minus_1; int output_frame_height_in_tiles_minus_1; int tile_count_minus_1;
uint32_t coded_tile_data_size; unsignedint ext_tile_debug; // for ext-tile software debug & testing
// Decoder has 3 modes of operation: // (1) Single-threaded decoding. // (2) Multi-threaded decoding with each tile decoded in parallel. // (3) In addition to (2), each thread decodes 1 superblock row in parallel. // row_mt = 1 triggers mode (3) above, while row_mt = 0, will trigger mode (1) // or (2) depending on 'max_threads'. unsignedint row_mt;
// Coding block buffer for the current frame. // Allocated and used only for multi-threaded decoding with 'row_mt == 0'. // See also: similar buffer in 'ThreadData' struct.
CB_BUFFER *cb_buffer_base; // Allocated size of 'cb_buffer_base'. Currently same as the number of // superblocks in the coded frame. int cb_buffer_alloc_size;
int context_update_tile_id; int skip_loop_filter; int skip_film_grain; int is_annexb; int valid_for_referencing[REF_FRAMES]; int is_fwd_kf_present; int is_arf_frame_present; int num_tile_groups;
aom_s_frame_info sframe_info;
/*! * Elements part of the sequence header, that are applicable for all the * frames in the video.
*/
SequenceHeader seq_params;
/*! * If true, buffer removal times are present.
*/ bool buffer_removal_time_present;
/*! * Code and details about current error status.
*/ struct aom_internal_error_info error;
/*! * Number of temporal layers: may be > 1 for SVC (scalable vector coding).
*/ unsignedint number_temporal_layers;
/*! * Number of spatial layers: may be > 1 for SVC (scalable vector coding).
*/ unsignedint number_spatial_layers;
} AV1Decoder;
// Returns 0 on success. Sets pbi->common.error.error_code to a nonzero error // code and returns a nonzero value on failure. int av1_receive_compressed_data(struct AV1Decoder *pbi, size_t size, const uint8_t **psource);
// Get the frame at a particular index in the output queue int av1_get_raw_frame(AV1Decoder *pbi, size_t index, YV12_BUFFER_CONFIG **sd,
aom_film_grain_t **grain_params);
int av1_get_frame_to_show(struct AV1Decoder *pbi, YV12_BUFFER_CONFIG *frame);
aom_codec_err_t av1_copy_reference_dec(struct AV1Decoder *pbi, int idx,
YV12_BUFFER_CONFIG *sd);
aom_codec_err_t av1_set_reference_dec(AV1_COMMON *cm, int idx, int use_external_ref,
YV12_BUFFER_CONFIG *sd);
aom_codec_err_t av1_copy_new_frame_dec(AV1_COMMON *cm,
YV12_BUFFER_CONFIG *new_frame,
YV12_BUFFER_CONFIG *sd);
staticinlinevoid decrease_ref_count(RefCntBuffer *const buf,
BufferPool *const pool) { if (buf != NULL) {
--buf->ref_count; // Reference counts should never become negative. If this assertion fails, // there is a bug in our reference count management.
assert(buf->ref_count >= 0); // A worker may only get a free framebuffer index when calling get_free_fb. // But the raw frame buffer is not set up until we finish decoding header. // So if any error happens during decoding header, frame_bufs[idx] will not // have a valid raw frame buffer. if (buf->ref_count == 0 && buf->raw_frame_buffer.data) {
pool->release_fb_cb(pool->cb_priv, &buf->raw_frame_buffer);
buf->raw_frame_buffer.data = NULL;
buf->raw_frame_buffer.size = 0;
buf->raw_frame_buffer.priv = NULL;
}
}
}
#define ACCT_STR __func__ staticinlineint av1_read_uniform(aom_reader *r, int n) { constint l = get_unsigned_bits(n); constint m = (1 << l) - n; constint v = aom_read_literal(r, l - 1, ACCT_STR);
assert(l != 0); if (v < m) return v; else return (v << 1) - m + aom_read_literal(r, 1, ACCT_STR);
}
typedefvoid (*palette_visitor_fn_t)(MACROBLOCKD *const xd, int plane,
aom_reader *r);
Die Informationen auf dieser Webseite wurden
nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit,
noch Qualität der bereit gestellten Informationen zugesichert.
Bemerkung:
Die farbliche Syntaxdarstellung und die Messung sind noch experimentell.