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ogg/flac: implement header packet skip in chained ogg bitstreams.

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This commit is contained in:
Romain Beauxis 2025-05-06 09:13:06 -05:00 • committed by Lynne
parent bd2dcfaed4
commit 2fb6416dd0
2 changed files with 26 additions and 4 deletions
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28
libavformat/oggparseflac.c
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@ -27,6 +27,8 @@
#include "oggdec.h"
#define OGG_FLAC_METADATA_TYPE_STREAMINFO 0x7F
#define OGG_FLAC_MAGIC "\177FLAC"
#define OGG_FLAC_MAGIC_SIZE sizeof(OGG_FLAC_MAGIC)-1
static int
flac_header (AVFormatContext * s, int idx)
@ -78,6 +80,27 @@ flac_header (AVFormatContext * s, int idx)
return 1;
}
static int
flac_packet (AVFormatContext * s, int idx)
{
struct ogg *ogg = s->priv_data;
struct ogg_stream *os = ogg->streams + idx;
if (os->psize > OGG_FLAC_MAGIC_SIZE &&
!memcmp(
os->buf + os->pstart,
OGG_FLAC_MAGIC,
OGG_FLAC_MAGIC_SIZE))
return 1;
if (os->psize > 0 &&
((os->buf[os->pstart] & 0x7F) == FLAC_METADATA_TYPE_VORBIS_COMMENT)) {
return 1;
}
return 0;
}
static int
old_flac_header (AVFormatContext * s, int idx)
{
@ -127,10 +150,11 @@ fail:
}
const struct ogg_codec ff_flac_codec = {
.magic = "\177FLAC",
.magicsize = 5,
.magic = OGG_FLAC_MAGIC,
.magicsize = OGG_FLAC_MAGIC_SIZE,
.header = flac_header,
.nb_header = 2,
.packet = flac_packet,
};
const struct ogg_codec ff_old_flac_codec = {