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movenc: reserved_moov_size, which allows placing moov at the begin of the file.

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2011-10-26 22:09:26 +02:00
parent 4416931fc0
commit 3a56169fec
2 changed files with 21 additions and 1 deletions
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20
libavformat/movenc.c
View File

@ -44,6 +44,7 @@
static const AVOption options[] = {
{ "movflags", "MOV muxer flags", offsetof(MOVMuxContext, flags), AV_OPT_TYPE_FLAGS, {.dbl = 0}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "movflags" },
{ "rtphint", "Add RTP hint tracks", 0, AV_OPT_TYPE_CONST, {.dbl = FF_MOV_FLAG_RTP_HINT}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "movflags" },
{ "moov_size", "maximum moov size so it can be placed at the begin", offsetof(MOVMuxContext, reserved_moov_size), AV_OPT_TYPE_INT, {.dbl = 0}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, 0 },
FF_RTP_FLAG_OPTS(MOVMuxContext, rtp_flags),
{ NULL },
};
@ -2274,6 +2275,11 @@ static int mov_write_header(AVFormatContext *s)
av_set_pts_info(st, 64, 1, track->timescale);
}
if(mov->reserved_moov_size){
mov->reserved_moov_pos= avio_tell(pb);
avio_skip(pb, mov->reserved_moov_size);
}
mov_write_mdat_tag(pb, mov);
#if FF_API_TIMESTAMP
@ -2328,9 +2334,21 @@ static int mov_write_trailer(AVFormatContext *s)
ffio_wfourcc(pb, "mdat");
avio_wb64(pb, mov->mdat_size+16);
}
avio_seek(pb, moov_pos, SEEK_SET);
avio_seek(pb, mov->reserved_moov_size ? mov->reserved_moov_pos : moov_pos, SEEK_SET);
mov_write_moov_tag(pb, mov, s);
if(mov->reserved_moov_size){
int64_t size= mov->reserved_moov_size - (avio_tell(pb) - mov->reserved_moov_pos);
if(size < 8){
av_log(s, AV_LOG_ERROR, "reserved_moov_size is too small, needed %Ld additional\n", 8-size);
return -1;
}
avio_wb32(pb, size);
ffio_wfourcc(pb, "free");
for(i=0; i<size; i++)
avio_w8(pb, 0);
avio_seek(pb, moov_pos, SEEK_SET);
}
if (mov->chapter_track)
av_freep(&mov->tracks[mov->chapter_track].enc);

2
libavformat/movenc.h
View File

@ -112,6 +112,8 @@ typedef struct MOVMuxContext {
int flags;
int rtp_flags;
int reserved_moov_size;
int64_t reserved_moov_pos;
} MOVMuxContext;
#define FF_MOV_FLAG_RTP_HINT 1