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Predicting the size of the hdlr, string data and trkn tags in the MOV muxer

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Originally committed as revision 22846 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Tomas Härdin 2010-04-12 07:24:30 +00:00
parent a367be1e88
commit 6b174197b5
1 changed files with 8 additions and 14 deletions
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22
libavformat/movenc.c
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@ -1330,8 +1330,7 @@ static int mov_write_mvhd_tag(ByteIOContext *pb, MOVMuxContext *mov)
static int mov_write_itunes_hdlr_tag(ByteIOContext *pb, MOVMuxContext *mov,
AVFormatContext *s)
{
int64_t pos = url_ftell(pb);
put_be32(pb, 0); /* size */
put_be32(pb, 33); /* size */
put_tag(pb, "hdlr");
put_be32(pb, 0);
put_be32(pb, 0);
@ -1340,20 +1339,20 @@ static int mov_write_itunes_hdlr_tag(ByteIOContext *pb, MOVMuxContext *mov,
put_be32(pb, 0);
put_be32(pb, 0);
put_byte(pb, 0);
return updateSize(pb, pos);
return 33;
}
/* helper function to write a data tag with the specified string as data */
static int mov_write_string_data_tag(ByteIOContext *pb, const char *data, int lang, int long_style)
{
if(long_style){
int64_t pos = url_ftell(pb);
put_be32(pb, 0); /* size */
int size = 16 + strlen(data);
put_be32(pb, size); /* size */
put_tag(pb, "data");
put_be32(pb, 1);
put_be32(pb, 0);
put_buffer(pb, data, strlen(data));
return updateSize(pb, pos);
return size;
}else{
if (!lang)
lang = ff_mov_iso639_to_lang("und", 1);
@ -1407,12 +1406,9 @@ static int mov_write_trkn_tag(ByteIOContext *pb, MOVMuxContext *mov,
AVMetadataTag *t = av_metadata_get(s->metadata, "track", NULL, 0);
int size = 0, track = t ? atoi(t->value) : 0;
if (track) {
int64_t pos = url_ftell(pb);
put_be32(pb, 0); /* size */
put_be32(pb, 32); /* size */
put_tag(pb, "trkn");
{
int64_t pos = url_ftell(pb);
put_be32(pb, 0); /* size */
put_be32(pb, 24); /* size */
put_tag(pb, "data");
put_be32(pb, 0); // 8 bytes empty
put_be32(pb, 0);
@ -1420,9 +1416,7 @@ static int mov_write_trkn_tag(ByteIOContext *pb, MOVMuxContext *mov,
put_be16(pb, track); // track number
put_be16(pb, 0); // total track number
put_be16(pb, 0); // empty
updateSize(pb, pos);
}
size = updateSize(pb, pos);
size = 32;
}
return size;
}