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Write the first seekhead if writing to a stream, we won't be able to seek

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back and write it at the end

Originally committed as revision 22198 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
David Conrad 2010-03-04 08:53:04 +00:00
parent 2529bb3019
commit 7a2a484081
1 changed files with 11 additions and 4 deletions
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11
libavformat/matroskaenc.c
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@ -288,7 +288,8 @@ static int mkv_add_seekhead_entry(mkv_seekhead *seekhead, unsigned int elementid
* be written at the location reserved for it. Otherwise, it is written
* at the current location in the file.
*
* @return The file offset where the seekhead was written.
* @return The file offset where the seekhead was written,
* -1 if an error occurred.
*/
static int64_t mkv_write_seekhead(ByteIOContext *pb, mkv_seekhead *seekhead)
{
@ -299,7 +300,8 @@ static int64_t mkv_write_seekhead(ByteIOContext *pb, mkv_seekhead *seekhead)
currentpos = url_ftell(pb);
if (seekhead->reserved_size > 0)
url_fseek(pb, seekhead->filepos, SEEK_SET);
if (url_fseek(pb, seekhead->filepos, SEEK_SET) < 0)
return -1;
metaseek = start_ebml_master(pb, MATROSKA_ID_SEEKHEAD, seekhead->reserved_size);
for (i = 0; i < seekhead->num_entries; i++) {
@ -731,6 +733,9 @@ static int mkv_write_header(AVFormatContext *s)
put_ebml_uint(pb, MATROSKA_ID_CLUSTERTIMECODE, 0);
mkv->cluster_pts = 0;
if (url_is_streamed(s->pb))
mkv_write_seekhead(pb, mkv->main_seekhead);
mkv->cues = mkv_start_cues(mkv->segment_offset);
if (mkv->cues == NULL)
return AVERROR(ENOMEM);
@ -896,8 +901,10 @@ static int mkv_write_trailer(AVFormatContext *s)
ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CUES , cuespos);
if (ret < 0) return ret;
if (second_seekhead >= 0) {
ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_SEEKHEAD, second_seekhead);
if (ret < 0) return ret;
}
mkv_write_seekhead(pb, mkv->main_seekhead);
// update the duration