diff options
Diffstat (limited to 'libavcodec/av1_parser.c')
| -rw-r--r-- | libavcodec/av1_parser.c | 228 |
1 files changed, 228 insertions, 0 deletions
diff --git a/libavcodec/av1_parser.c b/libavcodec/av1_parser.c new file mode 100644 index 0000000000..8df66498f4 --- /dev/null +++ b/libavcodec/av1_parser.c @@ -0,0 +1,228 @@ +/* + * 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_ERROR, "Failed to parse extradata.\n"); + goto end; + } + + ff_cbs_fragment_uninit(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_uninit(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_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, +}; |