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/*
* AV1 parser
*
* Copyright (C) 2018 James Almer <jamrial@gmail.com>
*
* 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
*/
#include "av1_parse.h"
#include "cbs.h"
#include "cbs_av1.h"
#include "parser.h"
typedef struct AV1ParseContext {
CodedBitstreamContext *cbc;
CodedBitstreamFragment temporal_unit;
int parsed_extradata;
} AV1ParseContext;
static const enum AVPixelFormat pix_fmts_8bit[2][2] = {
{ AV_PIX_FMT_YUV444P, AV_PIX_FMT_NONE },
{ AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P },
};
static const enum AVPixelFormat pix_fmts_10bit[2][2] = {
{ AV_PIX_FMT_YUV444P10, AV_PIX_FMT_NONE },
{ AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV420P10 },
};
static const enum AVPixelFormat pix_fmts_12bit[2][2] = {
{ AV_PIX_FMT_YUV444P12, AV_PIX_FMT_NONE },
{ AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV420P12 },
};
static int av1_parser_parse(AVCodecParserContext *ctx,
AVCodecContext *avctx,
const uint8_t **out_data, int *out_size,
const uint8_t *data, int size)
{
AV1ParseContext *s = ctx->priv_data;
CodedBitstreamFragment *td = &s->temporal_unit;
CodedBitstreamAV1Context *av1 = s->cbc->priv_data;
int ret;
*out_data = data;
*out_size = size;
ctx->key_frame = -1;
ctx->pict_type = AV_PICTURE_TYPE_NONE;
ctx->picture_structure = AV_PICTURE_STRUCTURE_UNKNOWN;
s->cbc->log_ctx = avctx;
if (avctx->extradata_size && !s->parsed_extradata) {
s->parsed_extradata = 1;
ret = ff_cbs_read(s->cbc, td, avctx->extradata, avctx->extradata_size);
if (ret < 0) {
av_log(avctx, AV_LOG_WARNING, "Failed to parse extradata.\n");
}
ff_cbs_fragment_reset(s->cbc, td);
}
ret = ff_cbs_read(s->cbc, td, data, size);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "Failed to parse temporal unit.\n");
goto end;
}
if (!av1->sequence_header) {
av_log(avctx, AV_LOG_ERROR, "No sequence header available\n");
goto end;
}
for (int i = 0; i < td->nb_units; i++) {
CodedBitstreamUnit *unit = &td->units[i];
AV1RawOBU *obu = unit->content;
AV1RawSequenceHeader *seq = av1->sequence_header;
AV1RawColorConfig *color = &seq->color_config;
AV1RawFrameHeader *frame;
int frame_type;
if (unit->type == AV1_OBU_FRAME)
frame = &obu->obu.frame.header;
else if (unit->type == AV1_OBU_FRAME_HEADER)
frame = &obu->obu.frame_header;
else
continue;
if (frame->show_existing_frame) {
AV1ReferenceFrameState *ref = &av1->ref[frame->frame_to_show_map_idx];
if (!ref->valid) {
av_log(avctx, AV_LOG_ERROR, "Invalid reference frame\n");
goto end;
}
ctx->width = ref->frame_width;
ctx->height = ref->frame_height;
frame_type = ref->frame_type;
ctx->key_frame = 0;
} else if (!frame->show_frame) {
continue;
} else {
ctx->width = av1->frame_width;
ctx->height = av1->frame_height;
frame_type = frame->frame_type;
ctx->key_frame = frame_type == AV1_FRAME_KEY;
}
avctx->profile = seq->seq_profile;
avctx->level = seq->seq_level_idx[0];
switch (frame_type) {
case AV1_FRAME_KEY:
case AV1_FRAME_INTRA_ONLY:
ctx->pict_type = AV_PICTURE_TYPE_I;
break;
case AV1_FRAME_INTER:
ctx->pict_type = AV_PICTURE_TYPE_P;
break;
case AV1_FRAME_SWITCH:
ctx->pict_type = AV_PICTURE_TYPE_SP;
break;
}
ctx->picture_structure = AV_PICTURE_STRUCTURE_FRAME;
switch (av1->bit_depth) {
case 8:
ctx->format = color->mono_chrome ? AV_PIX_FMT_GRAY8
: pix_fmts_8bit [color->subsampling_x][color->subsampling_y];
break;
case 10:
ctx->format = color->mono_chrome ? AV_PIX_FMT_GRAY10
: pix_fmts_10bit[color->subsampling_x][color->subsampling_y];
break;
case 12:
ctx->format = color->mono_chrome ? AV_PIX_FMT_GRAY12
: pix_fmts_12bit[color->subsampling_x][color->subsampling_y];
break;
}
av_assert2(ctx->format != AV_PIX_FMT_NONE);
}
end:
ff_cbs_fragment_reset(s->cbc, td);
s->cbc->log_ctx = NULL;
return size;
}
static const CodedBitstreamUnitType decompose_unit_types[] = {
AV1_OBU_TEMPORAL_DELIMITER,
AV1_OBU_SEQUENCE_HEADER,
AV1_OBU_FRAME_HEADER,
AV1_OBU_TILE_GROUP,
AV1_OBU_FRAME,
};
static av_cold int av1_parser_init(AVCodecParserContext *ctx)
{
AV1ParseContext *s = ctx->priv_data;
int ret;
ret = ff_cbs_init(&s->cbc, AV_CODEC_ID_AV1, NULL);
if (ret < 0)
return ret;
s->cbc->decompose_unit_types = (CodedBitstreamUnitType *)decompose_unit_types;
s->cbc->nb_decompose_unit_types = FF_ARRAY_ELEMS(decompose_unit_types);
return 0;
}
static void av1_parser_close(AVCodecParserContext *ctx)
{
AV1ParseContext *s = ctx->priv_data;
ff_cbs_fragment_free(s->cbc, &s->temporal_unit);
ff_cbs_close(&s->cbc);
}
static int av1_parser_split(AVCodecContext *avctx,
const uint8_t *buf, int buf_size)
{
AV1OBU obu;
const uint8_t *ptr = buf, *end = buf + buf_size;
while (ptr < end) {
int len = ff_av1_extract_obu(&obu, ptr, buf_size, avctx);
if (len < 0)
break;
if (obu.type == AV1_OBU_FRAME_HEADER ||
obu.type == AV1_OBU_FRAME) {
return ptr - buf;
}
ptr += len;
buf_size -= len;
}
return 0;
}
AVCodecParser ff_av1_parser = {
.codec_ids = { AV_CODEC_ID_AV1 },
.priv_data_size = sizeof(AV1ParseContext),
.parser_init = av1_parser_init,
.parser_close = av1_parser_close,
.parser_parse = av1_parser_parse,
.split = av1_parser_split,
};
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