libavcodec/av1_parser.c - third_party/ffmpeg - Git at Google

 /*
  * 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,
 };
	/*
	* 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,
	};