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Diffstat (limited to 'libavformat/movenc.c')
-rw-r--r--libavformat/movenc.c71
1 files changed, 58 insertions, 13 deletions
diff --git a/libavformat/movenc.c b/libavformat/movenc.c
index 22ba3fdf1b..9cc43ae8ce 100644
--- a/libavformat/movenc.c
+++ b/libavformat/movenc.c
@@ -61,6 +61,7 @@ static const AVOption options[] = {
{ "default_base_moof", "Set the default-base-is-moof flag in tfhd atoms", 0, AV_OPT_TYPE_CONST, {.i64 = FF_MOV_FLAG_DEFAULT_BASE_MOOF}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "movflags" },
{ "dash", "Write DASH compatible fragmented MP4", 0, AV_OPT_TYPE_CONST, {.i64 = FF_MOV_FLAG_DASH}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "movflags" },
{ "frag_discont", "Signal that the next fragment is discontinuous from earlier ones", 0, AV_OPT_TYPE_CONST, {.i64 = FF_MOV_FLAG_FRAG_DISCONT}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "movflags" },
+ { "delay_moov", "Delay writing the initial moov until the first fragment is cut, or until the first fragment flush", 0, AV_OPT_TYPE_CONST, {.i64 = FF_MOV_FLAG_DELAY_MOOV}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "movflags" },
FF_RTP_FLAG_OPTS(MOVMuxContext, rtp_flags),
{ "skip_iods", "Skip writing iods atom.", offsetof(MOVMuxContext, iods_skip), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, AV_OPT_FLAG_ENCODING_PARAM},
{ "iods_audio_profile", "iods audio profile atom.", offsetof(MOVMuxContext, iods_audio_profile), AV_OPT_TYPE_INT, {.i64 = -1}, -1, 255, AV_OPT_FLAG_ENCODING_PARAM},
@@ -1260,7 +1261,7 @@ static int mov_write_stbl_tag(AVIOContext *pb, MOVTrack *track)
if (track->mode == MODE_MOV && track->flags & MOV_TRACK_STPS)
mov_write_stss_tag(pb, track, MOV_PARTIAL_SYNC_SAMPLE);
if (track->enc->codec_type == AVMEDIA_TYPE_VIDEO &&
- track->flags & MOV_TRACK_CTTS)
+ track->flags & MOV_TRACK_CTTS && track->entry)
mov_write_ctts_tag(pb, track);
mov_write_stsc_tag(pb, track);
mov_write_stsz_tag(pb, track);
@@ -1771,6 +1772,12 @@ static int mov_write_trak_tag(AVIOContext *pb, MOVMuxContext *mov,
MOVTrack *track, AVStream *st)
{
int64_t pos = avio_tell(pb);
+ int entry_backup = track->entry;
+ /* If we want to have an empty moov, but some samples already have been
+ * buffered (delay_moov), pretend that no samples have been written yet. */
+ if (mov->flags & FF_MOV_FLAG_EMPTY_MOOV)
+ track->entry = 0;
+
avio_wb32(pb, 0); /* size */
ffio_wfourcc(pb, "trak");
mov_write_tkhd_tag(pb, mov, track, st);
@@ -1802,6 +1809,7 @@ static int mov_write_trak_tag(AVIOContext *pb, MOVMuxContext *mov,
}
}
mov_write_track_udta_tag(pb, mov, st);
+ track->entry = entry_backup;
return update_size(pb, pos);
}
@@ -1876,6 +1884,12 @@ static int mov_write_mvhd_tag(AVIOContext *pb, MOVMuxContext *mov)
max_track_id = mov->tracks[i].track_id;
}
}
+ /* If using delay_moov, make sure the output is the same as if no
+ * samples had been written yet. */
+ if (mov->flags & FF_MOV_FLAG_EMPTY_MOOV) {
+ max_track_len = 0;
+ max_track_id = 1;
+ }
version = max_track_len < UINT32_MAX ? 0 : 1;
(version == 1) ? avio_wb32(pb, 120) : avio_wb32(pb, 108); /* size */
@@ -3110,8 +3124,18 @@ static int mov_flush_fragment(AVFormatContext *s)
for (i = 0; i < mov->nb_streams; i++)
mov->tracks[i].data_offset = pos + buf_size + 8;
+ if (mov->flags & FF_MOV_FLAG_DELAY_MOOV)
+ mov_write_identification(s->pb, s);
mov_write_moov_tag(s->pb, mov, s);
+ if (mov->flags & FF_MOV_FLAG_DELAY_MOOV) {
+ if (mov->flags & FF_MOV_FLAG_FASTSTART)
+ mov->reserved_moov_pos = avio_tell(s->pb);
+ avio_flush(s->pb);
+ mov->fragments++;
+ return 0;
+ }
+
buf_size = avio_close_dyn_buf(mov->mdat_buf, &buf);
mov->mdat_buf = NULL;
avio_wb32(s->pb, buf_size + 8);
@@ -3194,6 +3218,19 @@ static int mov_flush_fragment(AVFormatContext *s)
return 0;
}
+static int mov_auto_flush_fragment(AVFormatContext *s)
+{
+ MOVMuxContext *mov = s->priv_data;
+ int ret = mov_flush_fragment(s);
+ if (ret < 0)
+ return ret;
+ // If using delay_moov, the first flush only wrote the moov,
+ // not the actual moof+mdat pair, thus flush once again.
+ if (mov->fragments == 1 && mov->flags & FF_MOV_FLAG_DELAY_MOOV)
+ ret = mov_flush_fragment(s);
+ return ret;
+}
+
int ff_mov_write_packet(AVFormatContext *s, AVPacket *pkt)
{
MOVMuxContext *mov = s->priv_data;
@@ -3206,7 +3243,7 @@ int ff_mov_write_packet(AVFormatContext *s, AVPacket *pkt)
if (mov->flags & FF_MOV_FLAG_FRAGMENT) {
int ret;
- if (mov->fragments > 0) {
+ if (mov->fragments > 0 || mov->flags & FF_MOV_FLAG_EMPTY_MOOV) {
if (!trk->mdat_buf) {
if ((ret = avio_open_dyn_buf(&trk->mdat_buf)) < 0)
return ret;
@@ -3334,11 +3371,12 @@ int ff_mov_write_packet(AVFormatContext *s, AVPacket *pkt)
trk->frag_start = pkt->dts;
trk->start_dts = 0;
trk->frag_discont = 0;
- } else if (pkt->dts && mov->flags & FF_MOV_FLAG_EMPTY_MOOV)
+ } else if (mov->fragments >= 1)
av_log(s, AV_LOG_WARNING,
- "Track %d starts with a nonzero dts %"PRId64". This "
- "currently isn't handled correctly in combination with "
- "empty_moov.\n", pkt->stream_index, pkt->dts);
+ "Track %d starts with a nonzero dts %"PRId64", while the moov "
+ "already has been written. Set the delay_moov flag to handle "
+ "this case.\n",
+ pkt->stream_index, pkt->dts);
}
trk->track_duration = pkt->dts - trk->start_dts + pkt->duration;
@@ -3413,7 +3451,7 @@ static int mov_write_packet(AVFormatContext *s, AVPacket *pkt)
enc->codec_type == AVMEDIA_TYPE_VIDEO &&
trk->entry && pkt->flags & AV_PKT_FLAG_KEY)) {
if (frag_duration >= mov->min_fragment_duration)
- mov_flush_fragment(s);
+ mov_auto_flush_fragment(s);
}
return ff_mov_write_packet(s, pkt);
@@ -3636,6 +3674,9 @@ static int mov_write_header(AVFormatContext *s)
else if (!strcmp("f4v", s->oformat->name)) mov->mode = MODE_F4V;
}
+ if (mov->flags & FF_MOV_FLAG_DELAY_MOOV)
+ mov->flags |= FF_MOV_FLAG_EMPTY_MOOV;
+
/* Set the FRAGMENT flag if any of the fragmentation methods are
* enabled. */
if (mov->max_fragment_duration || mov->max_fragment_size ||
@@ -3663,8 +3704,9 @@ static int mov_write_header(AVFormatContext *s)
mov->use_editlist = 0;
}
}
- if (mov->flags & FF_MOV_FLAG_EMPTY_MOOV && mov->use_editlist)
- av_log(s, AV_LOG_WARNING, "No meaningful edit list will be written when using empty_moov\n");
+ if (mov->flags & FF_MOV_FLAG_EMPTY_MOOV &&
+ !(mov->flags & FF_MOV_FLAG_DELAY_MOOV) && mov->use_editlist)
+ av_log(s, AV_LOG_WARNING, "No meaningful edit list will be written when using empty_moov without delay_moov\n");
if (!mov->use_editlist && s->avoid_negative_ts == AVFMT_AVOID_NEG_TS_AUTO)
s->avoid_negative_ts = AVFMT_AVOID_NEG_TS_MAKE_ZERO;
@@ -3678,8 +3720,10 @@ static int mov_write_header(AVFormatContext *s)
}
- if ((ret = mov_write_identification(pb, s)) < 0)
- return ret;
+ if (!(mov->flags & FF_MOV_FLAG_DELAY_MOOV)) {
+ if ((ret = mov_write_identification(pb, s)) < 0)
+ return ret;
+ }
mov->nb_streams = s->nb_streams;
if (mov->mode & (MODE_MP4|MODE_MOV|MODE_IPOD) && s->nb_chapters)
@@ -3828,7 +3872,8 @@ static int mov_write_header(AVFormatContext *s)
if (mov->flags & FF_MOV_FLAG_ISML)
mov_write_isml_manifest(pb, mov);
- if (mov->flags & FF_MOV_FLAG_EMPTY_MOOV) {
+ if (mov->flags & FF_MOV_FLAG_EMPTY_MOOV &&
+ !(mov->flags & FF_MOV_FLAG_DELAY_MOOV)) {
mov_write_moov_tag(pb, mov, s);
mov->fragments++;
if (mov->flags & FF_MOV_FLAG_FASTSTART)
@@ -4025,7 +4070,7 @@ static int mov_write_trailer(AVFormatContext *s)
mov_write_moov_tag(pb, mov, s);
}
} else {
- mov_flush_fragment(s);
+ mov_auto_flush_fragment(s);
for (i = 0; i < mov->nb_streams; i++)
mov->tracks[i].data_offset = 0;
if (mov->flags & FF_MOV_FLAG_FASTSTART) {
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-01 18:10:15 +0000