diff options
Diffstat (limited to 'libavformat/av1dec.c')
| -rw-r--r-- | libavformat/av1dec.c | 263 |
1 files changed, 240 insertions, 23 deletions
diff --git a/libavformat/av1dec.c b/libavformat/av1dec.c index 1be2fac1c1..3fa8764387 100644 --- a/libavformat/av1dec.c +++ b/libavformat/av1dec.c @@ -22,6 +22,7 @@ #include "config.h" #include "libavutil/common.h" +#include "libavutil/fifo.h" #include "libavutil/opt.h" #include "libavcodec/av1_parse.h" #include "avformat.h" @@ -70,6 +71,25 @@ static int read_obu(const uint8_t *buf, int size, int64_t *obu_size, int *type) return 0; } +//return < 0 if we need more data +static int get_score(int type, int *seq) +{ + switch (type) { + case AV1_OBU_SEQUENCE_HEADER: + *seq = 1; + return -1; + case AV1_OBU_FRAME: + case AV1_OBU_FRAME_HEADER: + return *seq ? AVPROBE_SCORE_EXTENSION + 1 : 0; + case AV1_OBU_METADATA: + case AV1_OBU_PADDING: + return -1; + default: + break; + } + return 0; +} + static int annexb_probe(const AVProbeData *p) { AVIOContext pb; @@ -123,19 +143,9 @@ static int annexb_probe(const AVProbeData *p) return 0; cnt += obu_unit_size; - switch (type) { - case AV1_OBU_SEQUENCE_HEADER: - seq = 1; - break; - case AV1_OBU_FRAME: - case AV1_OBU_FRAME_HEADER: - return seq ? AVPROBE_SCORE_EXTENSION + 1 : 0; - case AV1_OBU_TILE_GROUP: - case AV1_OBU_TEMPORAL_DELIMITER: - return 0; - default: - break; - } + ret = get_score(type, &seq); + if (ret >= 0) + return ret; temporal_unit_size -= obu_unit_size + ret; frame_unit_size -= obu_unit_size + ret; @@ -144,15 +154,14 @@ static int annexb_probe(const AVProbeData *p) return 0; } -static int annexb_read_header(AVFormatContext *s) +static int read_header(AVFormatContext *s, const AVRational *framerate, AVBSFContext **bsf, void *logctx) { - AnnexBContext *c = s->priv_data; const AVBitStreamFilter *filter = av_bsf_get_by_name("av1_frame_merge"); AVStream *st; int ret; if (!filter) { - av_log(c, AV_LOG_ERROR, "av1_frame_merge bitstream filter " + av_log(logctx, AV_LOG_ERROR, "av1_frame_merge bitstream filter " "not found. This is a bug, please report it.\n"); return AVERROR_BUG; } @@ -165,25 +174,32 @@ static int annexb_read_header(AVFormatContext *s) st->codecpar->codec_id = AV_CODEC_ID_AV1; st->need_parsing = AVSTREAM_PARSE_HEADERS; - st->internal->avctx->framerate = c->framerate; + st->internal->avctx->framerate = *framerate; // taken from rawvideo demuxers avpriv_set_pts_info(st, 64, 1, 1200000); - ret = av_bsf_alloc(filter, &c->bsf); + ret = av_bsf_alloc(filter, bsf); if (ret < 0) return ret; - ret = avcodec_parameters_copy(c->bsf->par_in, st->codecpar); + ret = avcodec_parameters_copy((*bsf)->par_in, st->codecpar); if (ret < 0) { - av_bsf_free(&c->bsf); + av_bsf_free(bsf); return ret; } - ret = av_bsf_init(c->bsf); + ret = av_bsf_init(*bsf); if (ret < 0) - av_bsf_free(&c->bsf); + av_bsf_free(bsf); return ret; + +} + +static int annexb_read_header(AVFormatContext *s) +{ + AnnexBContext *c = s->priv_data; + return read_header(s, &c->framerate, &c->bsf, c); } static int annexb_read_packet(AVFormatContext *s, AVPacket *pkt) @@ -251,12 +267,193 @@ static int annexb_read_close(AVFormatContext *s) return 0; } -#define OFFSET(x) offsetof(AnnexBContext, x) +typedef struct ObuContext { + const AVClass *class; + AVBSFContext *bsf; + AVRational framerate; + AVFifoBuffer *fifo; +} ObuContext; + +//For low overhead obu, we can't foresee the obu size before we parsed the header. +//So, we can't use parse_obu_header here, since it will check size <= buf_size +//see c27c7b49dc for more details +static int read_obu_with_size(const uint8_t *buf, int buf_size, int64_t *obu_size, int *type) +{ + GetBitContext gb; + int ret, extension_flag, start_pos; + int64_t size; + + ret = init_get_bits8(&gb, buf, FFMIN(buf_size, MAX_OBU_HEADER_SIZE)); + if (ret < 0) + return ret; + + if (get_bits1(&gb) != 0) // obu_forbidden_bit + return AVERROR_INVALIDDATA; + + *type = get_bits(&gb, 4); + extension_flag = get_bits1(&gb); + if (!get_bits1(&gb)) // has_size_flag + return AVERROR_INVALIDDATA; + skip_bits1(&gb); // obu_reserved_1bit + + if (extension_flag) { + get_bits(&gb, 3); // temporal_id + get_bits(&gb, 2); // spatial_id + skip_bits(&gb, 3); // extension_header_reserved_3bits + } + + *obu_size = leb128(&gb); + if (*obu_size > INT_MAX) + return AVERROR_INVALIDDATA; + + if (get_bits_left(&gb) < 0) + return AVERROR_INVALIDDATA; + + start_pos = get_bits_count(&gb) / 8; + + size = *obu_size + start_pos; + if (size > INT_MAX) + return AVERROR_INVALIDDATA; + return size; +} + +static int obu_probe(const AVProbeData *p) +{ + int64_t obu_size; + int seq = 0; + int ret, type, cnt; + + // Check that the first OBU is a Temporal Delimiter. + cnt = read_obu_with_size(p->buf, p->buf_size, &obu_size, &type); + if (cnt < 0 || type != AV1_OBU_TEMPORAL_DELIMITER || obu_size != 0) + return 0; + + while (1) { + ret = read_obu_with_size(p->buf + cnt, p->buf_size - cnt, &obu_size, &type); + if (ret < 0 || obu_size <= 0) + return 0; + cnt += ret; + + ret = get_score(type, &seq); + if (ret >= 0) + return ret; + } + return 0; +} + +static int obu_read_header(AVFormatContext *s) +{ + ObuContext *c = s->priv_data; + c->fifo = av_fifo_alloc(MAX_OBU_HEADER_SIZE); + if (!c->fifo) + return AVERROR(ENOMEM); + return read_header(s, &c->framerate, &c->bsf, c); +} + +static int obu_prefetch(AVFormatContext *s, uint8_t* dest) +{ + ObuContext *c = s->priv_data; + int size = av_fifo_space(c->fifo); + av_fifo_generic_write(c->fifo, s->pb, size, + (int (*)(void*, void*, int))avio_read); + size = av_fifo_size(c->fifo); + if (size > 0) { + av_fifo_generic_peek(c->fifo, dest, size, NULL); + } + return size; +} + +static int obu_read_data(AVFormatContext *s, AVPacket *pkt, int len) +{ + int size, left; + ObuContext *c = s->priv_data; + int ret = av_new_packet(pkt, len); + if (ret < 0) { + av_log(c, AV_LOG_ERROR, "Failed to allocate packet for obu\n"); + return ret; + } + size = FFMIN(av_fifo_size(c->fifo), len); + av_fifo_generic_read(c->fifo, pkt->data, size, NULL); + left = len - size; + if (left > 0) { + ret = avio_read(s->pb, pkt->data + size, left); + if (ret != left) { + av_log(c, AV_LOG_ERROR, "Failed to read %d frome file\n", left); + return ret; + } + } + return 0; +} + +static int obu_get_packet(AVFormatContext *s, AVPacket *pkt) +{ + ObuContext *c = s->priv_data; + int64_t obu_size; + int ret, type; + uint8_t header[MAX_OBU_HEADER_SIZE]; + + ret = obu_prefetch(s, header); + if (!ret) + return AVERROR(EOF); + + ret = read_obu_with_size(header, ret, &obu_size, &type); + if (ret < 0) { + av_log(c, AV_LOG_ERROR, "Failed to read obu\n"); + return ret; + } + return obu_read_data(s, pkt, ret); +} + +static int obu_read_packet(AVFormatContext *s, AVPacket *pkt) +{ + ObuContext *c = s->priv_data; + int ret; + + while (1) { + ret = obu_get_packet(s, pkt); + if (ret < 0) + return ret; + ret = av_bsf_send_packet(c->bsf, pkt); + if (ret < 0) { + av_log(s, AV_LOG_ERROR, "Failed to send packet to " + "av1_frame_merge filter\n"); + return ret; + } + ret = av_bsf_receive_packet(c->bsf, pkt); + if (ret < 0 && ret != AVERROR(EAGAIN) && ret != AVERROR_EOF) + av_log(s, AV_LOG_ERROR, "av1_frame_merge filter failed to " + "send output packet\n"); + if (ret != AVERROR(EAGAIN)) + break; + } + + return ret; +} + +static int obu_read_close(AVFormatContext *s) +{ + ObuContext *c = s->priv_data; + + av_fifo_freep(&c->fifo); + av_bsf_free(&c->bsf); + return 0; +} + #define DEC AV_OPT_FLAG_DECODING_PARAM + +#define OFFSET(x) offsetof(AnnexBContext, x) static const AVOption annexb_options[] = { { "framerate", "", OFFSET(framerate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, INT_MAX, DEC}, { NULL }, }; +#undef OFFSET + +#define OFFSET(x) offsetof(ObuContext, x) +static const AVOption obu_options[] = { + { "framerate", "", OFFSET(framerate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, INT_MAX, DEC}, + { NULL }, +}; +#undef OFFSET static const AVClass annexb_demuxer_class = { .class_name = "AV1 Annex B demuxer", @@ -277,3 +474,23 @@ AVInputFormat ff_av1_demuxer = { .flags = AVFMT_GENERIC_INDEX, .priv_class = &annexb_demuxer_class, }; + +static const AVClass obu_demuxer_class = { + .class_name = "AV1 low overhead OBU demuxer", + .item_name = av_default_item_name, + .option = obu_options, + .version = LIBAVUTIL_VERSION_INT, +}; + +AVInputFormat ff_obu_demuxer = { + .name = "obu", + .long_name = NULL_IF_CONFIG_SMALL("AV1 low overhead OBU"), + .priv_data_size = sizeof(ObuContext), + .read_probe = obu_probe, + .read_header = obu_read_header, + .read_packet = obu_read_packet, + .read_close = obu_read_close, + .extensions = "obu", + .flags = AVFMT_GENERIC_INDEX, + .priv_class = &obu_demuxer_class, +}; |