/* * Copyright (c) 2017, 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.
*/
// Lightfield Encoder // ================== // // This is an example of a simple lightfield encoder. It builds upon the // twopass_encoder.c example. It takes an input file in YV12 format, // treating it as a planar lightfield instead of a video. The img_width // and img_height arguments are the dimensions of the lightfield images, // while the lf_width and lf_height arguments are the number of // lightfield images in each dimension. The lf_blocksize determines the // number of reference images used for MCP. For example, 5 means that there // is a reference image for every 5x5 lightfield image block. All images // within a block will use the center image in that block as the reference // image for MCP. // Run "make test" to download lightfield test data: vase10x10.yuv. // Run lightfield encoder to encode whole lightfield: // examples/lightfield_encoder 1024 1024 vase10x10.yuv vase10x10.ivf 10 10 5
// Note: In bitstream.c and encoder.c, define EXT_TILE_DEBUG as 1 will print // out the uncompressed header and the frame contexts, which can be used to // test the bit exactness of the headers and the frame contexts for large scale // tile coded frames.
if (!aom_video_writer_write_frame(writer, pkt->data.frame.buf,
pkt->data.frame.sz,
pkt->data.frame.pts))
die_codec(ctx, "Failed to write compressed frame.");
printf(keyframe ? "K" : ".");
fflush(stdout);
}
}
return got_pkts;
}
staticvoid get_raw_image(aom_image_t **frame_to_encode, aom_image_t *raw,
aom_image_t *raw_shift) { if (FORCE_HIGHBITDEPTH_DECODING) { // Need to allocate larger buffer to use hbd internal. int input_shift = 0;
aom_img_upshift(raw_shift, raw, input_shift);
*frame_to_encode = raw_shift;
} else {
*frame_to_encode = raw;
}
}
static aom_fixed_buf_t pass0(aom_image_t *raw, FILE *infile,
aom_codec_iface_t *encoder, const aom_codec_enc_cfg_t *cfg, int lf_width, int lf_height, int lf_blocksize, int flags,
aom_image_t *raw_shift) {
aom_codec_ctx_t codec; int frame_count = 0; int image_size_bytes = img_size_bytes(raw); int u_blocks, v_blocks; int bu, bv;
aom_fixed_buf_t stats = { NULL, 0 };
aom_image_t *frame_to_encode;
if (aom_codec_enc_init(&codec, encoder, cfg, flags))
die("Failed to initialize encoder"); if (aom_codec_control(&codec, AOME_SET_ENABLEAUTOALTREF, 0))
die_codec(&codec, "Failed to turn off auto altref"); if (aom_codec_control(&codec, AV1E_SET_FRAME_PARALLEL_DECODING, 0))
die_codec(&codec, "Failed to set frame parallel decoding");
// How many reference images we need to encode.
u_blocks = (lf_width + lf_blocksize - 1) / lf_blocksize;
v_blocks = (lf_height + lf_blocksize - 1) / lf_blocksize;
printf("\n First pass: ");
for (bv = 0; bv < v_blocks; ++bv) { for (bu = 0; bu < u_blocks; ++bu) { constint block_u_min = bu * lf_blocksize; constint block_v_min = bv * lf_blocksize; int block_u_end = (bu + 1) * lf_blocksize; int block_v_end = (bv + 1) * lf_blocksize; int u_block_size, v_block_size; int block_ref_u, block_ref_v;
staticvoid pass1(aom_image_t *raw, FILE *infile, constchar *outfile_name,
aom_codec_iface_t *encoder, aom_codec_enc_cfg_t *cfg, int lf_width, int lf_height, int lf_blocksize, int flags,
aom_image_t *raw_shift) {
AvxVideoInfo info = { get_fourcc_by_aom_encoder(encoder),
cfg->g_w,
cfg->g_h,
{ cfg->g_timebase.num, cfg->g_timebase.den },
0 };
AvxVideoWriter *writer = NULL;
aom_codec_ctx_t codec; int frame_count = 0; int image_size_bytes = img_size_bytes(raw); int bu, bv; int u_blocks, v_blocks;
aom_image_t *frame_to_encode;
aom_image_t reference_images[MAX_EXTERNAL_REFERENCES]; int reference_image_num = 0; int i;
writer = aom_video_writer_open(outfile_name, kContainerIVF, &info); if (!writer) die("Failed to open %s for writing", outfile_name);
if (aom_codec_enc_init(&codec, encoder, cfg, flags))
die("Failed to initialize encoder"); if (aom_codec_control(&codec, AOME_SET_ENABLEAUTOALTREF, 0))
die_codec(&codec, "Failed to turn off auto altref"); if (aom_codec_control(&codec, AV1E_SET_FRAME_PARALLEL_DECODING, 0))
die_codec(&codec, "Failed to set frame parallel decoding"); if (aom_codec_control(&codec, AV1E_ENABLE_EXT_TILE_DEBUG, 1))
die_codec(&codec, "Failed to enable encoder ext_tile debug"); if (aom_codec_control(&codec, AOME_SET_CPUUSED, 3))
die_codec(&codec, "Failed to set cpu-used");
// Note: The superblock is a sequence parameter and has to be the same for 1 // sequence. In lightfield application, must choose the superblock size(either // 64x64 or 128x128) before the encoding starts. Otherwise, the default is // AOM_SUPERBLOCK_SIZE_DYNAMIC, and the superblock size will be set to 64x64 // internally. if (aom_codec_control(&codec, AV1E_SET_SUPERBLOCK_SIZE,
AOM_SUPERBLOCK_SIZE_64X64))
die_codec(&codec, "Failed to set SB size");
reference_image_num = u_blocks * v_blocks; // Set the max gf group length so the references are guaranteed to be in // a different gf group than any of the regular frames. This avoids using // both vbr and constant quality mode in a single group. The number of // references now cannot surpass 17 because of the enforced MAX_GF_INTERVAL of // 16. If it is necessary to exceed this reference frame limit, one will have // to do some additional handling to ensure references are in separate gf // groups from the regular frames. if (aom_codec_control(&codec, AV1E_SET_MAX_GF_INTERVAL,
reference_image_num - 1))
die_codec(&codec, "Failed to set max gf interval");
aom_img_fmt_t ref_fmt = AOM_IMG_FMT_I420; if (FORCE_HIGHBITDEPTH_DECODING) ref_fmt |= AOM_IMG_FMT_HIGHBITDEPTH; // Allocate memory with the border so that it can be used as a reference. constbool resize =
codec.config.enc->rc_resize_mode || codec.config.enc->rc_superres_mode; constbool all_intra = reference_image_num - 1 == 0; int border_in_pixels =
av1_get_enc_border_size(resize, all_intra, BLOCK_64X64);
for (i = 0; i < reference_image_num; i++) { if (!aom_img_alloc_with_border(&reference_images[i], ref_fmt, cfg->g_w,
cfg->g_h, 32, 8, border_in_pixels)) {
die("Failed to allocate image.");
}
}
printf("\n Second pass: ");
// Encode reference images first.
printf("Encoding Reference Images\n"); for (bv = 0; bv < v_blocks; ++bv) { for (bu = 0; bu < u_blocks; ++bu) { constint block_u_min = bu * lf_blocksize; constint block_v_min = bv * lf_blocksize; int block_u_end = (bu + 1) * lf_blocksize; int block_v_end = (bv + 1) * lf_blocksize; int u_block_size, v_block_size; int block_ref_u, block_ref_v;
// Reference frames may be encoded without tiles.
++frame_count;
printf("Encoding reference image %d of %d\n", bv * u_blocks + bu,
u_blocks * v_blocks);
encode_frame(&codec, frame_to_encode, frame_count, 1,
AOM_EFLAG_NO_REF_LAST2 | AOM_EFLAG_NO_REF_LAST3 |
AOM_EFLAG_NO_REF_GF | AOM_EFLAG_NO_REF_ARF |
AOM_EFLAG_NO_REF_BWD | AOM_EFLAG_NO_REF_ARF2 |
AOM_EFLAG_NO_UPD_LAST | AOM_EFLAG_NO_UPD_GF |
AOM_EFLAG_NO_UPD_ARF | AOM_EFLAG_NO_UPD_ENTROPY,
writer);
if (aom_codec_control(&codec, AV1_COPY_NEW_FRAME_IMAGE,
&reference_images[frame_count - 1]))
die_codec(&codec, "Failed to copy decoder reference frame");
}
}
cfg->large_scale_tile = 1; // Fixed q encoding for camera frames.
cfg->rc_end_usage = AOM_Q; if (aom_codec_enc_config_set(&codec, cfg))
die_codec(&codec, "Failed to configure encoder");
// The fixed q value used in encoding. if (aom_codec_control(&codec, AOME_SET_CQ_LEVEL, 36))
die_codec(&codec, "Failed to set cq level"); if (aom_codec_control(&codec, AV1E_SET_FRAME_PARALLEL_DECODING, 1))
die_codec(&codec, "Failed to set frame parallel decoding"); if (aom_codec_control(&codec, AV1E_SET_SINGLE_TILE_DECODING, 1))
die_codec(&codec, "Failed to turn on single tile decoding"); // Set tile_columns and tile_rows to MAX values, which guarantees the tile // size of 64 x 64 pixels(i.e. 1 SB) for <= 4k resolution. if (aom_codec_control(&codec, AV1E_SET_TILE_COLUMNS, 6))
die_codec(&codec, "Failed to set tile width"); if (aom_codec_control(&codec, AV1E_SET_TILE_ROWS, 6))
die_codec(&codec, "Failed to set tile height");
for (bv = 0; bv < v_blocks; ++bv) { for (bu = 0; bu < u_blocks; ++bu) { constint block_u_min = bu * lf_blocksize; constint block_v_min = bv * lf_blocksize; int block_u_end = (bu + 1) * lf_blocksize; int block_v_end = (bv + 1) * lf_blocksize; int u, v;
block_u_end = block_u_end < lf_width ? block_u_end : lf_width;
block_v_end = block_v_end < lf_height ? block_v_end : lf_height; for (v = block_v_min; v < block_v_end; ++v) { for (u = block_u_min; u < block_u_end; ++u) {
av1_ref_frame_t ref;
ref.idx = 0;
ref.use_external_ref = 1;
ref.img = reference_images[bv * u_blocks + bu]; if (aom_codec_control(&codec, AV1_SET_REFERENCE, &ref))
die_codec(&codec, "Failed to set reference frame");
printf("C%d, ", (u + v * lf_width));
fseek(infile, (u + v * lf_width) * image_size_bytes, SEEK_SET);
aom_img_read(raw, infile);
get_raw_image(&frame_to_encode, raw, raw_shift);
int main(int argc, char **argv) {
FILE *infile = NULL; int w, h; // The number of lightfield images in the u and v dimensions. int lf_width, lf_height; // Defines how many images refer to the same reference image for MCP. // lf_blocksize X lf_blocksize images will all use the reference image // in the middle of the block of images. int lf_blocksize;
aom_codec_ctx_t codec;
aom_codec_enc_cfg_t cfg;
aom_image_t raw;
aom_image_t raw_shift;
aom_codec_err_t res;
aom_fixed_buf_t stats; int flags = 0;
if (w <= 0 || h <= 0 || (w % 2) != 0 || (h % 2) != 0)
die("Invalid frame size: %dx%d", w, h); if (lf_width <= 0 || lf_height <= 0)
die("Invalid lf_width and/or lf_height: %dx%d", lf_width, lf_height); if (lf_blocksize <= 0) die("Invalid lf_blocksize: %d", lf_blocksize);
if (!aom_img_alloc(&raw, AOM_IMG_FMT_I420, w, h, 32)) {
die("Failed to allocate image.");
} if (FORCE_HIGHBITDEPTH_DECODING) { // Need to allocate larger buffer to use hbd internal.
aom_img_alloc(&raw_shift, AOM_IMG_FMT_I420 | AOM_IMG_FMT_HIGHBITDEPTH, w, h,
32);
}
// Configuration
res = aom_codec_enc_config_default(encoder, &cfg, 0); if (res) die_codec(&codec, "Failed to get default codec config.");
cfg.g_w = w;
cfg.g_h = h;
cfg.g_timebase.num = 1;
cfg.g_timebase.den = fps;
cfg.rc_target_bitrate = bitrate;
cfg.g_error_resilient = 0; // This is required.
cfg.g_lag_in_frames = 0; // need to set this since default is 19.
cfg.kf_mode = AOM_KF_DISABLED;
cfg.large_scale_tile = 0; // Only set it to 1 for camera frame encoding.
cfg.g_bit_depth = AOM_BITS_8;
flags |= (cfg.g_bit_depth > AOM_BITS_8 || FORCE_HIGHBITDEPTH_DECODING)
? AOM_CODEC_USE_HIGHBITDEPTH
: 0;
if (!(infile = fopen(infile_arg, "rb")))
die("Failed to open %s for reading", infile_arg);
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