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Code Issues Releases Activity

avformat/flvdec: support all multi-track modes

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This commit is contained in:
Timo Rothenpieler
2024-05-20 02:32:11 +02:00
parent da32990e83
commit e2a8ece352
1 changed files with 334 additions and 285 deletions
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97
libavformat/flvdec.c
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@@ -1275,6 +1275,7 @@ static int flv_read_packet(AVFormatContext *s, AVPacket *pkt)
{
FLVContext *flv = s->priv_data;
int ret, i, size, flags;
int res = 0;
enum FlvTagType type;
int stream_type=-1;
int64_t next, pos, meta_pos;
@@ -1289,6 +1290,7 @@ static int flv_read_packet(AVFormatContext *s, AVPacket *pkt)
int pkt_type = 0;
uint8_t track_idx = 0;
uint32_t codec_id = 0;
int multitrack_type = MultitrackTypeOneTrack;
retry:
/* pkt size is repeated at end. skip it */
@@ -1339,14 +1341,9 @@ retry:
if (pkt_type == AudioPacketTypeMultitrack) {
uint8_t types = avio_r8(s->pb);
int multitrack_type = types >> 4;
multitrack_type = types & 0xF0;
pkt_type = types & 0xF;
if (multitrack_type != MultitrackTypeOneTrack) {
av_log(s, AV_LOG_ERROR, "Audio multitrack types other than MultitrackTypeOneTrack are unsupported!\n");
return AVERROR_PATCHWELCOME;
}
multitrack = 1;
size--;
}
@@ -1373,14 +1370,9 @@ retry:
if (pkt_type == PacketTypeMultitrack) {
uint8_t types = avio_r8(s->pb);
int multitrack_type = types >> 4;
multitrack_type = types & 0xF0;
pkt_type = types & 0xF;
if (multitrack_type != MultitrackTypeOneTrack) {
av_log(s, AV_LOG_ERROR, "Multitrack types other than MultitrackTypeOneTrack are unsupported!\n");
return AVERROR_PATCHWELCOME;
}
multitrack = 1;
size--;
}
@@ -1449,6 +1441,14 @@ skip:
goto leave;
}
for (;;) {
int track_size = size;
if (multitrack_type != MultitrackTypeOneTrack) {
track_size = avio_rb24(s->pb);
size -= 3;
}
/* now find stream */
for (i = 0; i < s->nb_streams; i++) {
st = s->streams[i];
@@ -1485,7 +1485,7 @@ skip:
if ((s->pb->seekable & AVIO_SEEKABLE_NORMAL) &&
((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY ||
stream_type == FLV_STREAM_TYPE_AUDIO))
av_add_index_entry(st, pos, dts, size, 0, AVINDEX_KEYFRAME);
av_add_index_entry(st, pos, dts, track_size, 0, AVINDEX_KEYFRAME);
if ((st->discard >= AVDISCARD_NONKEY && !((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY || stream_type == FLV_STREAM_TYPE_AUDIO)) ||
(st->discard >= AVDISCARD_BIDIR && ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_DISP_INTER && stream_type == FLV_STREAM_TYPE_VIDEO)) ||
@@ -1573,6 +1573,7 @@ retry_duration:
int channel_order = avio_r8(s->pb);
channels = avio_r8(s->pb);
size -= 2;
track_size -= 2;
av_channel_layout_uninit(&st->codecpar->ch_layout);
@@ -1597,6 +1598,7 @@ retry_duration:
} else if (channel_order == AudioChannelOrderNative) {
uint64_t mask = avio_rb32(s->pb);
size -= 4;
track_size -= 4;
// The first 18 entries in the mask match ours, but the remaining 6 entries start at AV_CHAN_LOW_FREQUENCY_2
mask = (mask & 0x3FFFF) | ((mask & 0xFC0000) << (AV_CHAN_LOW_FREQUENCY_2 - 18));
@@ -1616,6 +1618,7 @@ retry_duration:
if (sret < 0)
return sret;
size -= sret;
track_size -= sret;
} else if (stream_type == FLV_STREAM_TYPE_SUBTITLE) {
st->codecpar->codec_id = AV_CODEC_ID_TEXT;
} else if (stream_type == FLV_STREAM_TYPE_DATA) {
@@ -1636,9 +1639,10 @@ retry_duration:
} else {
type = avio_r8(s->pb);
size--;
track_size--;
}
if (size < 0) {
if (size < 0 || track_size < 0) {
ret = AVERROR_INVALIDDATA;
goto leave;
}
@@ -1665,6 +1669,7 @@ retry_duration:
dts = pts = AV_NOPTS_VALUE;
}
size -= 3;
track_size -= 3;
}
if (type == 0 && (!st->codecpar->extradata || st->codecpar->codec_id == AV_CODEC_ID_AAC ||
st->codecpar->codec_id == AV_CODEC_ID_OPUS || st->codecpar->codec_id == AV_CODEC_ID_FLAC ||
@@ -1673,12 +1678,12 @@ retry_duration:
AVDictionaryEntry *t;
if (st->codecpar->extradata) {
if ((ret = flv_queue_extradata(flv, s->pb, multitrack ? track_idx : stream_type, size, multitrack)) < 0)
if ((ret = flv_queue_extradata(flv, s->pb, multitrack ? track_idx : stream_type, track_size, multitrack)) < 0)
return ret;
ret = FFERROR_REDO;
goto leave;
}
if ((ret = flv_get_extradata(s, st, size)) < 0)
if ((ret = flv_get_extradata(s, st, track_size)) < 0)
return ret;
/* Workaround for buggy Omnia A/XE encoder */
@@ -1691,34 +1696,42 @@ retry_duration:
}
}
/* skip empty data packets */
if (!size) {
/* skip empty or broken data packets */
if (size <= 0 || track_size < 0) {
ret = FFERROR_REDO;
goto leave;
}
ret = av_get_packet(s->pb, pkt, size);
/* skip empty data track */
if (!track_size)
goto next_track;
ret = av_get_packet(s->pb, pkt, track_size);
if (ret < 0)
return ret;
track_size -= ret;
size -= ret;
pkt->dts = dts;
pkt->pts = pts == AV_NOPTS_VALUE ? dts : pts;
pkt->stream_index = st->index;
pkt->pos = pos;
if (!multitrack && flv->new_extradata[stream_type]) {
int sret = av_packet_add_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA,
ret = av_packet_add_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA,
flv->new_extradata[stream_type],
flv->new_extradata_size[stream_type]);
if (sret >= 0) {
if (ret >= 0) {
flv->new_extradata[stream_type] = NULL;
flv->new_extradata_size[stream_type] = 0;
}
} else if (multitrack &&
flv->mt_extradata_cnt > track_idx &&
flv->mt_extradata[track_idx]) {
int sret = av_packet_add_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA,
ret = av_packet_add_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA,
flv->mt_extradata[track_idx],
flv->mt_extradata_sz[track_idx]);
if (sret >= 0) {
if (ret >= 0) {
flv->mt_extradata[track_idx] = NULL;
flv->mt_extradata_sz[track_idx] = 0;
}
@@ -1737,6 +1750,42 @@ retry_duration:
stream_type == FLV_STREAM_TYPE_DATA)
pkt->flags |= AV_PKT_FLAG_KEY;
ret = ff_buffer_packet(s, pkt);
if (ret < 0)
return ret;
res = FFERROR_REDO;
if (track_size) {
av_log(s, AV_LOG_WARNING, "Track size mismatch: %d!\n", track_size);
avio_skip(s->pb, track_size);
size -= track_size;
}
if (!size)
break;
next_track:
if (multitrack_type == MultitrackTypeOneTrack) {
av_log(s, AV_LOG_ERROR, "Attempted to read next track in single-track mode.\n");
ret = FFERROR_REDO;
goto leave;
}
if (multitrack_type == MultitrackTypeManyTracksManyCodecs) {
codec_id = avio_rb32(s->pb);
size -= 4;
}
track_idx = avio_r8(s->pb);
size--;
if (avio_feof(s->pb)) {
av_log(s, AV_LOG_WARNING, "Premature EOF\n");
/* return REDO so that any potentially queued up packages can be drained first */
return FFERROR_REDO;
}
}
leave:
last = avio_rb32(s->pb);
if (!flv->trust_datasize) {
@@ -1757,7 +1806,7 @@ leave:
if (ret >= 0)
flv->last_ts = pkt->dts;
return ret;
return ret ? ret : res;
}
static int flv_read_seek(AVFormatContext *s, int stream_index,