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movenc: Buffer the mdat for the initial moov fragment, too

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This allows writing QuickTime-compatible fragmented mp4 (with
a non-empty moov atom) to a non-seekable output.

This buffers the mdat for the initial fragment just as it does
for all normal fragments, too. Previously, the resulting
atom structure was mdat,moov, moof,mdat ..., while it now
is moov,mdat, moof,mdat.

Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Martin Storsjö 2012-02-02 12:50:26 +02:00
parent b70f04c261
commit 0c7b8b758a
2 changed files with 51 additions and 24 deletions
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74
libavformat/movenc.c
View File

@ -96,9 +96,9 @@ static int mov_write_stco_tag(AVIOContext *pb, MOVTrack *track)
avio_wb32(pb, track->entry); /* entry count */
for (i=0; i<track->entry; i++) {
if(mode64 == 1)
avio_wb64(pb, track->cluster[i].pos);
avio_wb64(pb, track->cluster[i].pos + track->data_offset);
else
avio_wb32(pb, track->cluster[i].pos);
avio_wb32(pb, track->cluster[i].pos + track->data_offset);
}
return update_size(pb, pos);
}
@ -2681,6 +2681,10 @@ static int mov_flush_fragment(AVFormatContext *s)
if (!(mov->flags & FF_MOV_FLAG_EMPTY_MOOV) && mov->fragments == 0) {
int64_t pos = avio_tell(s->pb);
int ret;
AVIOContext *moov_buf;
uint8_t *buf;
int buf_size;
for (i = 0; i < mov->nb_streams; i++)
if (!mov->tracks[i].entry)
@ -2688,10 +2692,24 @@ static int mov_flush_fragment(AVFormatContext *s)
/* Don't write the initial moov unless all tracks have data */
if (i < mov->nb_streams)
return 0;
avio_seek(s->pb, mov->mdat_pos, SEEK_SET);
avio_wb32(s->pb, mov->mdat_size + 8);
avio_seek(s->pb, pos, SEEK_SET);
if ((ret = avio_open_dyn_buf(&moov_buf)) < 0)
return ret;
mov_write_moov_tag(moov_buf, mov, s);
buf_size = avio_close_dyn_buf(moov_buf, &buf);
av_free(buf);
for (i = 0; i < mov->nb_streams; i++)
mov->tracks[i].data_offset = pos + buf_size + 8;
mov_write_moov_tag(s->pb, mov, s);
buf_size = avio_close_dyn_buf(mov->mdat_buf, &buf);
mov->mdat_buf = NULL;
avio_wb32(s->pb, buf_size + 8);
ffio_wfourcc(s->pb, "mdat");
avio_write(s->pb, buf, buf_size);
av_free(buf);
mov->fragments++;
mov->mdat_size = 0;
for (i = 0; i < mov->nb_streams; i++) {
@ -2804,13 +2822,21 @@ static int mov_write_packet_internal(AVFormatContext *s, AVPacket *pkt)
mov_flush_fragment(s);
}
if (mov->flags & FF_MOV_FLAG_FRAGMENT && mov->fragments > 0) {
if (!trk->mdat_buf) {
int ret;
if ((ret = avio_open_dyn_buf(&trk->mdat_buf)) < 0)
return ret;
if (mov->flags & FF_MOV_FLAG_FRAGMENT) {
int ret;
if (mov->fragments > 0) {
if (!trk->mdat_buf) {
if ((ret = avio_open_dyn_buf(&trk->mdat_buf)) < 0)
return ret;
}
pb = trk->mdat_buf;
} else {
if (!mov->mdat_buf) {
if ((ret = avio_open_dyn_buf(&mov->mdat_buf)) < 0)
return ret;
}
pb = mov->mdat_buf;
}
pb = trk->mdat_buf;
}
if (enc->codec_id == CODEC_ID_AMR_NB) {
@ -2972,11 +2998,18 @@ static int mov_write_header(AVFormatContext *s)
AVDictionaryEntry *t;
int i, hint_track = 0;
/* Non-seekable output is ok if EMPTY_MOOV is set, or if using the ismv
* format (which sets EMPTY_MOOV later in this function). If ism_lookahead
/* Set the FRAGMENT flag if any of the fragmentation methods are
* enabled. */
if (mov->max_fragment_duration || mov->max_fragment_size ||
mov->flags & (FF_MOV_FLAG_EMPTY_MOOV |
FF_MOV_FLAG_FRAG_KEYFRAME |
FF_MOV_FLAG_FRAG_CUSTOM))
mov->flags |= FF_MOV_FLAG_FRAGMENT;
/* Non-seekable output is ok if using fragmentation. If ism_lookahead
* is enabled, we don't support non-seekable output at all. */
if (!s->pb->seekable &&
((!(mov->flags & FF_MOV_FLAG_EMPTY_MOOV) &&
((!(mov->flags & FF_MOV_FLAG_FRAGMENT) &&
!(s->oformat && !strcmp(s->oformat->name, "ismv")))
|| mov->ism_lookahead)) {
av_log(s, AV_LOG_ERROR, "muxer does not support non seekable output\n");
@ -3116,18 +3149,11 @@ static int mov_write_header(AVFormatContext *s)
FF_MOV_FLAG_FRAG_CUSTOM)) &&
!mov->max_fragment_duration && !mov->max_fragment_size)
mov->max_fragment_duration = 5000000;
mov->flags |= FF_MOV_FLAG_EMPTY_MOOV | FF_MOV_FLAG_SEPARATE_MOOF;
mov->flags |= FF_MOV_FLAG_EMPTY_MOOV | FF_MOV_FLAG_SEPARATE_MOOF |
FF_MOV_FLAG_FRAGMENT;
}
/* Set the FRAGMENT flag if any of the fragmentation methods are
* enabled. */
if (mov->max_fragment_duration || mov->max_fragment_size ||
mov->flags & (FF_MOV_FLAG_EMPTY_MOOV |
FF_MOV_FLAG_FRAG_KEYFRAME |
FF_MOV_FLAG_FRAG_CUSTOM))
mov->flags |= FF_MOV_FLAG_FRAGMENT;
if (!(mov->flags & FF_MOV_FLAG_EMPTY_MOOV))
if (!(mov->flags & FF_MOV_FLAG_FRAGMENT))
mov_write_mdat_tag(pb, mov);
if (t = av_dict_get(s->metadata, "creation_time", NULL, 0))

1
libavformat/movenc.h
View File

@ -151,6 +151,7 @@ typedef struct MOVMuxContext {
int max_fragment_duration;
int max_fragment_size;
int ism_lookahead;
AVIOContext *mdat_buf;
} MOVMuxContext;
#define FF_MOV_FLAG_RTP_HINT 1