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In ogg muxer, use random serial number of each ogg streams

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Originally committed as revision 23302 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Baptiste Coudurier 2010-05-24 23:37:33 +00:00
parent a24039861d
commit ce2a9bc3c8
1 changed files with 18 additions and 1 deletions
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19
libavformat/oggenc.c
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@ -20,6 +20,7 @@
*/
#include "libavutil/crc.h"
#include "libavutil/random_seed.h"
#include "libavcodec/xiph.h"
#include "libavcodec/bytestream.h"
#include "libavcodec/flac.h"
@ -50,6 +51,7 @@ typedef struct {
int eos;
unsigned page_count; ///< number of page buffered
OGGPage page; ///< current page
unsigned serial_num; ///< serial number
} OGGStreamContext;
typedef struct OGGPageList {
@ -80,7 +82,7 @@ static void ogg_write_page(AVFormatContext *s, OGGPage *page, int extra_flags)
put_byte(s->pb, 0);
put_byte(s->pb, page->flags | extra_flags);
put_le64(s->pb, page->granule);
put_le32(s->pb, page->stream_index);
put_le32(s->pb, oggstream->serial_num);
put_le32(s->pb, oggstream->page_counter++);
crc_offset = url_ftell(s->pb);
put_le32(s->pb, 0); // crc
@ -280,8 +282,11 @@ static int ogg_write_header(AVFormatContext *s)
{
OGGStreamContext *oggstream;
int i, j;
for (i = 0; i < s->nb_streams; i++) {
AVStream *st = s->streams[i];
unsigned serial_num = i;
if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO)
av_set_pts_info(st, 64, 1, st->codec->sample_rate);
else if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO)
@ -300,6 +305,18 @@ static int ogg_write_header(AVFormatContext *s)
}
oggstream = av_mallocz(sizeof(*oggstream));
oggstream->page.stream_index = i;
if (!(st->codec->flags & CODEC_FLAG_BITEXACT))
do {
serial_num = av_get_random_seed();
for (j = 0; j < i; j++) {
OGGStreamContext *sc = s->streams[j]->priv_data;
if (serial_num == sc->serial_num)
break;
}
} while (j < i);
oggstream->serial_num = serial_num;
st->priv_data = oggstream;
if (st->codec->codec_id == CODEC_ID_FLAC) {
int err = ogg_build_flac_headers(st->codec, oggstream,