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Write the duration of the file

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Originally committed as revision 10312 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
David Conrad 2007-09-05 00:23:11 +00:00
parent f57b85a569
commit 02f487fc77
1 changed files with 18 additions and 1 deletions
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19
libavformat/matroskaenc.c
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@ -28,6 +28,8 @@ typedef struct MatroskaMuxContext {
offset_t segment;
offset_t cluster;
uint64_t cluster_pts;
offset_t duration_offset;
uint64_t duration;
} MatroskaMuxContext;
static void put_ebml_id(ByteIOContext *pb, unsigned int id)
@ -155,7 +157,11 @@ static int mkv_write_header(AVFormatContext *s)
// XXX: both are required; something better for writing app?
put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, LIBAVFORMAT_IDENT);
}
// XXX: segment UID and duration
// XXX: segment UID
// reserve space for the duration
mkv->duration = 0;
mkv->duration_offset = url_ftell(pb);
put_ebml_void(pb, 11); // assumes double-precision float to be written
end_ebml_master(pb, segment_info);
tracks = start_ebml_master(pb, MATROSKA_ID_TRACKS);
@ -290,6 +296,8 @@ static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
put_byte(pb, !!(pkt->flags & PKT_FLAG_KEY));
put_buffer(pb, pkt->data, pkt->size);
end_ebml_master(pb, block);
mkv->duration = pkt->pts + pkt->duration;
return 0;
}
@ -297,7 +305,16 @@ static int mkv_write_trailer(AVFormatContext *s)
{
MatroskaMuxContext *mkv = s->priv_data;
ByteIOContext *pb = &s->pb;
offset_t currentpos;
end_ebml_master(pb, mkv->cluster);
// update the duration
currentpos = url_ftell(pb);
url_fseek(pb, mkv->duration_offset, SEEK_SET);
put_ebml_float(pb, MATROSKA_ID_DURATION, mkv->duration);
url_fseek(pb, currentpos, SEEK_SET);
end_ebml_master(pb, mkv->segment);
return 0;
}