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movenc: Add a flag for using default-base-is-moof in tfhd atoms 

Similarly to the omit_tfhd_offset flag added in e7bf085b, this
avoids writing absolute byte positions to the file, making them
more easily streamable.

This is a new feature from 14496-12:2012, so application support
isn't necessarily too widespread yet (support for it in libav was
added in 20f95f21f in July 2014).

Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Martin Storsjö 2014-10-29 11:53:21 +02:00
parent 600d5ee6b1
commit cf589faa5b
4 changed files with 20 additions and 4 deletions
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7
doc/muxers.texi
View File

@ -340,6 +340,13 @@ cause failures when the file is reprocessed with certain tagging programs.
@item -movflags omit_tfhd_offset
Do not write any absolute base_data_offset in tfhd atoms. This avoids
tying fragments to absolute byte positions in the file/streams.
@item -movflags default_base_moof
Similarly to the omit_tfhd_offset, this flag avoids writing the
absolute base_data_offset field in tfhd atoms, but does so by using
the new default-base-is-moof flag instead. This flag is new from
14496-12:2012. This may make the fragments easier to parse in certain
circumstances (avoiding basing track fragment location calculations
on the implicit end of the previous track fragment).
@end table
Smooth Streaming content can be pushed in real time to a publishing

14
libavformat/movenc.c
View File

@ -58,6 +58,7 @@ static const AVOption options[] = {
{ "faststart", "Run a second pass to put the index (moov atom) at the beginning of the file", 0, AV_OPT_TYPE_CONST, {.i64 = FF_MOV_FLAG_FASTSTART}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "movflags" },
{ "omit_tfhd_offset", "Omit the base data offset in tfhd atoms", 0, AV_OPT_TYPE_CONST, {.i64 = FF_MOV_FLAG_OMIT_TFHD_OFFSET}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "movflags" },
{ "disable_chpl", "Disable Nero chapter atom", 0, AV_OPT_TYPE_CONST, {.i64 = FF_MOV_FLAG_DISABLE_CHPL}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "movflags" },
{ "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" },
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},
@ -2386,6 +2387,10 @@ static int mov_write_tfhd_tag(AVIOContext *pb, MOVMuxContext *mov,
}
if (mov->flags & FF_MOV_FLAG_OMIT_TFHD_OFFSET)
flags &= ~MOV_TFHD_BASE_DATA_OFFSET;
if (mov->flags & FF_MOV_FLAG_DEFAULT_BASE_MOOF) {
flags &= ~MOV_TFHD_BASE_DATA_OFFSET;
flags |= MOV_TFHD_DEFAULT_BASE_IS_MOOF;
}
/* Don't set a default sample size, the silverlight player refuses
* to play files with that set. Don't set a default sample duration,
@ -2457,7 +2462,7 @@ static int mov_write_trun_tag(AVIOContext *pb, MOVMuxContext *mov,
avio_wb32(pb, track->entry); /* sample count */
if (mov->flags & FF_MOV_FLAG_OMIT_TFHD_OFFSET &&
!(mov->flags & FF_MOV_FLAG_SEPARATE_MOOF) &&
!(mov->flags & (FF_MOV_FLAG_SEPARATE_MOOF | FF_MOV_FLAG_DEFAULT_BASE_MOOF)) &&
!mov->first_trun)
avio_wb32(pb, 0); /* Later tracks follow immediately after the previous one */
else
@ -2717,6 +2722,8 @@ static int mov_write_ftyp_tag(AVIOContext *pb, AVFormatContext *s)
minor = has_h264 ? 0x20000 : 0x10000;
} else if (mov->mode == MODE_PSP)
ffio_wfourcc(pb, "MSNV");
else if (mov->mode == MODE_MP4 && mov->flags & FF_MOV_FLAG_DEFAULT_BASE_MOOF)
ffio_wfourcc(pb, "iso5"); // Required when using default-base-is-moof
else if (mov->mode == MODE_MP4)
ffio_wfourcc(pb, "isom");
else if (mov->mode == MODE_IPOD)
@ -2734,8 +2741,9 @@ static int mov_write_ftyp_tag(AVIOContext *pb, AVFormatContext *s)
ffio_wfourcc(pb, "qt ");
else if (mov->mode == MODE_ISM) {
ffio_wfourcc(pb, "piff");
ffio_wfourcc(pb, "iso2");
} else {
if (!(mov->flags & FF_MOV_FLAG_DEFAULT_BASE_MOOF))
ffio_wfourcc(pb, "iso2");
} else if (!(mov->flags & FF_MOV_FLAG_DEFAULT_BASE_MOOF)) {
ffio_wfourcc(pb, "isom");
ffio_wfourcc(pb, "iso2");
if (has_h264)

1
libavformat/movenc.h
View File

@ -178,6 +178,7 @@ typedef struct MOVMuxContext {
#define FF_MOV_FLAG_FASTSTART 128
#define FF_MOV_FLAG_OMIT_TFHD_OFFSET 256
#define FF_MOV_FLAG_DISABLE_CHPL 512
#define FF_MOV_FLAG_DEFAULT_BASE_MOOF 1024
int ff_mov_write_packet(AVFormatContext *s, AVPacket *pkt);

2
libavformat/version.h
View File

@ -31,7 +31,7 @@
#define LIBAVFORMAT_VERSION_MAJOR 56
#define LIBAVFORMAT_VERSION_MINOR 6
#define LIBAVFORMAT_VERSION_MICRO 1
#define LIBAVFORMAT_VERSION_MICRO 2
#define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
LIBAVFORMAT_VERSION_MINOR, \