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Write segment UID

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Originally committed as revision 10337 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
David Conrad 2007-09-05 00:24:03 +00:00
parent 80380a0f71
commit 4b8f58eea5
1 changed files with 12 additions and 1 deletions
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13
libavformat/matroskaenc.c
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@ -20,6 +20,7 @@
*/
#include "avformat.h"
#include "random.h"
#include "riff.h"
#include "xiph.h"
#include "matroska.h"
@ -61,6 +62,8 @@ typedef struct MatroskaMuxContext {
mkv_seekhead *main_seekhead;
mkv_seekhead *cluster_seekhead;
mkv_cues *cues;
AVRandomState rand_state;
} MatroskaMuxContext;
static void put_ebml_id(ByteIOContext *pb, unsigned int id)
@ -507,6 +510,9 @@ static int mkv_write_header(AVFormatContext *s)
MatroskaMuxContext *mkv = s->priv_data;
ByteIOContext *pb = &s->pb;
offset_t ebml_header, segment_info;
int i;
av_init_random(av_gettime(), &mkv->rand_state);
ebml_header = start_ebml_master(pb, EBML_ID_HEADER);
put_ebml_uint (pb, EBML_ID_EBMLVERSION , 1);
@ -536,11 +542,16 @@ static int mkv_write_header(AVFormatContext *s)
if (strlen(s->title))
put_ebml_string(pb, MATROSKA_ID_TITLE, s->title);
if (!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)) {
uint8_t segmentuid[16];
for (i = 0; i < 16; i++)
segmentuid[i] = av_random(&mkv->rand_state);
put_ebml_string(pb, MATROSKA_ID_MUXINGAPP , LIBAVFORMAT_IDENT);
put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, LIBAVFORMAT_IDENT);
put_ebml_date (pb, MATROSKA_ID_DATEUTC , av_gettime() );
put_ebml_binary(pb, MATROSKA_ID_SEGMENTUID, segmentuid, 16);
}
// XXX: segment UID
// reserve space for the duration
mkv->duration = 0;
mkv->duration_offset = url_ftell(pb);