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movenc: Allow writing to a non-seekable output if using empty moov

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In this mode, no seeks will be done except for within moov/moof
fragments, which should fit within the AVIOContext buffer.

This allows pushing live smooth streaming format data to
a live publishing point on IIS over http.

Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Martin Storsjö 2012-01-19 11:17:13 +02:00
parent f532210499
commit e771e6dd63
1 changed files with 13 additions and 2 deletions
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15
libavformat/movenc.c
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@ -2518,6 +2518,7 @@ static int mov_flush_fragment(AVFormatContext *s)
mov->tracks[i].cluster[0].dts;
mov->tracks[i].entry = 0;
}
avio_flush(s->pb);
return 0;
}
@ -2557,6 +2558,7 @@ static int mov_flush_fragment(AVFormatContext *s)
if (write_moof) {
MOVFragmentInfo *info;
avio_flush(s->pb);
track->nb_frag_info++;
track->frag_info = av_realloc(track->frag_info,
sizeof(*track->frag_info) *
@ -2589,6 +2591,7 @@ static int mov_flush_fragment(AVFormatContext *s)
mov->mdat_size = 0;
avio_flush(s->pb);
return 0;
}
@ -2602,7 +2605,9 @@ static int mov_write_packet_internal(AVFormatContext *s, AVPacket *pkt)
int size= pkt->size;
uint8_t *reformatted_data = NULL;
if (!s->pb->seekable) return 0; /* Can't handle that */
if (!s->pb->seekable && !(mov->flags & FF_MOV_FLAG_EMPTY_MOOV))
return 0; /* Can't handle that */
if (!size) return 0; /* Discard 0 sized packets */
if ((mov->max_fragment_duration && trk->entry &&
@ -2782,7 +2787,13 @@ static int mov_write_header(AVFormatContext *s)
AVDictionaryEntry *t;
int i, hint_track = 0;
if (!s->pb->seekable) {
/* 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
* is enabled, we don't support non-seekable output at all. */
if (!s->pb->seekable &&
((!(mov->flags & FF_MOV_FLAG_EMPTY_MOOV) &&
!(s->oformat && !strcmp(s->oformat->name, "ismv")))
|| mov->ism_lookahead)) {
av_log(s, AV_LOG_ERROR, "muxer does not support non seekable output\n");
return -1;
}