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

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Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Romain Beauxis
2025-05-24 13:14:07 -05:00
committed by Michael Niedermayer
parent c9cc61d620
commit 574f634e49
4 changed files with 122 additions and 40 deletions
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11
libavcodec/vorbis_parser.h
View File

@ -30,6 +30,17 @@
typedef struct AVVorbisParseContext AVVorbisParseContext;
/**
* Used by the vorbis parser to pass new chained stream headers
* as extradata.
*/
typedef struct vorbis_new_extradata {
uint8_t *header;
size_t header_size;
uint8_t *setup;
size_t setup_size;
} vorbis_new_extradata;
/**
* Allocate and initialize the Vorbis parser using headers in the extradata.
*/

37
libavcodec/vorbisdec.c
View File

@ -43,6 +43,7 @@
#include "vorbis.h"
#include "vorbisdsp.h"
#include "vorbis_data.h"
#include "vorbis_parser.h"
#include "xiph.h"
#define V_NB_BITS 8
@ -1778,11 +1779,24 @@ static int vorbis_decode_frame(AVCodecContext *avctx, AVFrame *frame,
GetBitContext *gb = &vc->gb;
float *channel_ptrs[255];
int i, len, ret;
size_t new_extradata_size;
vorbis_new_extradata *new_extradata;
const uint8_t *header;
const uint8_t *setup;
ff_dlog(NULL, "packet length %d \n", buf_size);
if (*buf == 1 && buf_size > 7) {
if ((ret = init_get_bits8(gb, buf + 1, buf_size - 1)) < 0)
new_extradata = (vorbis_new_extradata *)av_packet_get_side_data(
avpkt, AV_PKT_DATA_NEW_EXTRADATA, &new_extradata_size);
if (new_extradata) {
header = new_extradata->header;
setup = new_extradata->setup;
if (new_extradata->header_size > 7 && *header == 1) {
if ((ret = init_get_bits8(
gb, header + 1,
new_extradata->header_size - 1)) < 0)
return ret;
vorbis_free(vc);
@ -1797,20 +1811,19 @@ static int vorbis_decode_frame(AVCodecContext *avctx, AVFrame *frame,
avctx->ch_layout.order = AV_CHANNEL_ORDER_UNSPEC;
avctx->ch_layout.nb_channels = vc->audio_channels;
} else {
av_channel_layout_copy(&avctx->ch_layout, &ff_vorbis_ch_layouts[vc->audio_channels - 1]);
av_channel_layout_copy(
&avctx->ch_layout,
&ff_vorbis_ch_layouts[vc->audio_channels - 1]);
}
avctx->sample_rate = vc->audio_samplerate;
return buf_size;
}
if (*buf == 3 && buf_size > 7) {
av_log(avctx, AV_LOG_DEBUG, "Ignoring comment header\n");
return buf_size;
}
if (*buf == 5 && buf_size > 7 && vc->channel_residues && !vc->modes) {
if ((ret = init_get_bits8(gb, buf + 1, buf_size - 1)) < 0)
if (new_extradata->setup_size > 7 && *setup == 5 &&
vc->channel_residues && !vc->modes) {
if ((ret = init_get_bits8(
gb, setup + 1,
new_extradata->setup_size - 1)) < 0)
return ret;
if ((ret = vorbis_parse_setup_hdr(vc))) {
@ -1818,7 +1831,7 @@ static int vorbis_decode_frame(AVCodecContext *avctx, AVFrame *frame,
vorbis_free(vc);
return ret;
}
return buf_size;
}
}
if (!vc->channel_residues || !vc->modes) {

69
libavformat/oggparsevorbis.c
View File

@ -255,12 +255,19 @@ static void vorbis_cleanup(AVFormatContext *s, int idx)
struct ogg *ogg = s->priv_data;
struct ogg_stream *os = ogg->streams + idx;
struct oggvorbis_private *priv = os->private;
vorbis_new_extradata *new_extradata;
int i;
if (os->private) {
av_vorbis_parse_free(&priv->vp);
for (i = 0; i < 3; i++)
av_freep(&priv->packet[i]);
}
if (os->new_extradata) {
new_extradata = (vorbis_new_extradata *)os->new_extradata;
av_freep(&new_extradata->header);
av_freep(&new_extradata->setup);
}
}
static int vorbis_update_metadata(AVFormatContext *s, int idx)
@ -433,7 +440,10 @@ static int vorbis_packet(AVFormatContext *s, int idx)
struct ogg *ogg = s->priv_data;
struct ogg_stream *os = ogg->streams + idx;
struct oggvorbis_private *priv = os->private;
vorbis_new_extradata *new_extradata;
int duration, flags = 0;
int skip_packet = 0;
int ret;
if (!priv->vp)
return AVERROR_INVALIDDATA;
@ -496,10 +506,61 @@ static int vorbis_packet(AVFormatContext *s, int idx)
if (duration < 0) {
os->pflags |= AV_PKT_FLAG_CORRUPT;
return 0;
} else if (flags & VORBIS_FLAG_COMMENT) {
vorbis_update_metadata(s, idx);
flags = 0;
}
if (flags & VORBIS_FLAG_HEADER) {
ret = vorbis_parse_header(s, s->streams[idx], os->buf + os->pstart, os->psize);
if (ret < 0)
return ret;
if (!os->new_extradata) {
os->new_extradata = av_mallocz(sizeof(vorbis_new_extradata));
if (!os->new_extradata)
return AVERROR(ENOMEM);
}
os->new_extradata_size = sizeof(vorbis_new_extradata);
new_extradata = (vorbis_new_extradata *)os->new_extradata;
ret = av_reallocp(&new_extradata->header, os->psize);
if (ret < 0)
return ret;
memcpy(new_extradata->header, os->buf + os->pstart, os->psize);
new_extradata->header_size = os->psize;
skip_packet = 1;
}
if (flags & VORBIS_FLAG_COMMENT) {
ret = vorbis_update_metadata(s, idx);
if (ret < 0)
return ret;
flags = 0;
skip_packet = 1;
}
if (flags & VORBIS_FLAG_SETUP) {
if (!os->new_extradata) {
os->new_extradata = av_mallocz(sizeof(vorbis_new_extradata));
if (!os->new_extradata)
return AVERROR(ENOMEM);
}
os->new_extradata_size = sizeof(vorbis_new_extradata);
new_extradata = (vorbis_new_extradata *)os->new_extradata;
ret = av_reallocp(&new_extradata->setup, os->psize);
if (ret < 0)
return ret;
memcpy(new_extradata->setup, os->buf + os->pstart, os->psize);
new_extradata->setup_size = os->psize;
skip_packet = 1;
}
os->pduration = duration;
}
@ -521,7 +582,7 @@ static int vorbis_packet(AVFormatContext *s, int idx)
priv->final_duration += os->pduration;
}
return 0;
return skip_packet;
}
const struct ogg_codec ff_vorbis_codec = {

3
tests/ref/fate/ogg-vorbis-chained-meta.txt
View File

@ -6,10 +6,7 @@ Stream ID: 0, frame PTS: 128, metadata: N/A
Stream ID: 0, packet PTS: 704, packet DTS: 704
Stream ID: 0, frame PTS: 704, metadata: N/A
Stream ID: 0, packet PTS: 0, packet DTS: 0
Stream ID: 0, packet PTS: 0, packet DTS: 0
Stream ID: 0, new metadata: encoder=Lavc61.19.100 libvorbis:title=Second Stream
Stream ID: 0, packet PTS: 0, packet DTS: 0
Stream ID: 0, packet PTS: 0, packet DTS: 0
Stream ID: 0, frame PTS: 0, metadata: N/A
Stream ID: 0, packet PTS: 128, packet DTS: 128
Stream ID: 0, frame PTS: 128, metadata: N/A