diff options
| -rw-r--r-- | doc/muxers.texi | 10 | ||||
| -rw-r--r-- | libavformat/movenc.c | 50 | ||||
| -rw-r--r-- | libavformat/movenc.h | 9 |
3 files changed, 69 insertions, 0 deletions
diff --git a/doc/muxers.texi b/doc/muxers.texi index 80c65420ba..33f1f7bbaf 100644 --- a/doc/muxers.texi +++ b/doc/muxers.texi @@ -1344,6 +1344,16 @@ be negative. This enables the initial sample to have DTS/CTS of zero, and reduces the need for edit lists for some cases such as video tracks with B-frames. Additionally, eases conformance with the DASH-IF interoperability guidelines. +@item -write_prft +Write producer time reference box (PRFT) with a specified time source for the +NTP field in the PRFT box. Set value as @samp{wallclock} to specify timesource +as wallclock time and @samp{pts} to specify timesource as input packets' PTS +values. + +Setting value to @samp{pts} is applicable only for a live encoding use case, +where PTS values are set as as wallclock time at the source. For example, an +encoding use case with decklink capture source where @option{video_pts} and +@option{audio_pts} are set to @samp{abs_wallclock}. @end table @subsection Example diff --git a/libavformat/movenc.c b/libavformat/movenc.c index 0b44fd66ea..7e616e866f 100644 --- a/libavformat/movenc.c +++ b/libavformat/movenc.c @@ -98,6 +98,9 @@ static const AVOption options[] = { { "encryption_kid", "The media encryption key identifier (hex)", offsetof(MOVMuxContext, encryption_kid), AV_OPT_TYPE_BINARY, .flags = AV_OPT_FLAG_ENCODING_PARAM }, { "use_stream_ids_as_track_ids", "use stream ids as track ids", offsetof(MOVMuxContext, use_stream_ids_as_track_ids), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, AV_OPT_FLAG_ENCODING_PARAM}, { "write_tmcd", "force or disable writing tmcd", offsetof(MOVMuxContext, write_tmcd), AV_OPT_TYPE_BOOL, {.i64 = -1}, -1, 1, AV_OPT_FLAG_ENCODING_PARAM}, + { "write_prft", "Write producer reference time box with specified time source", offsetof(MOVMuxContext, write_prft), AV_OPT_TYPE_INT, {.i64 = MOV_PRFT_NONE}, 0, MOV_PRFT_NB-1, AV_OPT_FLAG_ENCODING_PARAM, "prft"}, + { "wallclock", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = MOV_PRFT_SRC_WALLCLOCK}, 0, 0, AV_OPT_FLAG_ENCODING_PARAM, "prft"}, + { "pts", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = MOV_PRFT_SRC_PTS}, 0, 0, AV_OPT_FLAG_ENCODING_PARAM, "prft"}, { NULL }, }; @@ -4514,6 +4517,49 @@ static int mov_write_sidx_tags(AVIOContext *pb, MOVMuxContext *mov, return 0; } +static int mov_write_prft_tag(AVIOContext *pb, MOVMuxContext *mov, int tracks) +{ + int64_t pos = avio_tell(pb), pts_us, ntp_ts; + MOVTrack *first_track; + + /* PRFT should be associated with at most one track. So, choosing only the + * first track. */ + if (tracks > 0) + return 0; + first_track = &(mov->tracks[0]); + + if (!first_track->entry) { + av_log(mov->fc, AV_LOG_WARNING, "Unable to write PRFT, no entries in the track\n"); + return 0; + } + + if (first_track->cluster[0].pts == AV_NOPTS_VALUE) { + av_log(mov->fc, AV_LOG_WARNING, "Unable to write PRFT, first PTS is invalid\n"); + return 0; + } + + if (mov->write_prft == MOV_PRFT_SRC_WALLCLOCK) { + ntp_ts = ff_get_formatted_ntp_time(ff_ntp_time()); + } else if (mov->write_prft == MOV_PRFT_SRC_PTS) { + pts_us = av_rescale_q(first_track->cluster[0].pts, + first_track->st->time_base, AV_TIME_BASE_Q); + ntp_ts = ff_get_formatted_ntp_time(pts_us + NTP_OFFSET_US); + } else { + av_log(mov->fc, AV_LOG_WARNING, "Unsupported PRFT box configuration: %d\n", + mov->write_prft); + return 0; + } + + avio_wb32(pb, 0); // Size place holder + ffio_wfourcc(pb, "prft"); // Type + avio_w8(pb, 1); // Version + avio_wb24(pb, 0); // Flags + avio_wb32(pb, first_track->track_id); // reference track ID + avio_wb64(pb, ntp_ts); // NTP time stamp + avio_wb64(pb, first_track->cluster[0].pts); //media time + return update_size(pb, pos); +} + static int mov_write_moof_tag(AVIOContext *pb, MOVMuxContext *mov, int tracks, int64_t mdat_size) { @@ -4528,6 +4574,9 @@ static int mov_write_moof_tag(AVIOContext *pb, MOVMuxContext *mov, int tracks, if (mov->flags & FF_MOV_FLAG_DASH && !(mov->flags & FF_MOV_FLAG_GLOBAL_SIDX)) mov_write_sidx_tags(pb, mov, tracks, moof_size + 8 + mdat_size); + if (mov->write_prft > MOV_PRFT_NONE && mov->write_prft < MOV_PRFT_NB) + mov_write_prft_tag(pb, mov, tracks); + if (mov->flags & FF_MOV_FLAG_GLOBAL_SIDX || !(mov->flags & FF_MOV_FLAG_SKIP_TRAILER) || mov->ism_lookahead) { @@ -5317,6 +5366,7 @@ int ff_mov_write_packet(AVFormatContext *s, AVPacket *pkt) trk->cluster[trk->entry].size = size; trk->cluster[trk->entry].entries = samples_in_chunk; trk->cluster[trk->entry].dts = pkt->dts; + trk->cluster[trk->entry].pts = pkt->pts; if (!trk->entry && trk->start_dts != AV_NOPTS_VALUE) { if (!trk->frag_discont) { /* First packet of a new fragment. We already wrote the duration diff --git a/libavformat/movenc.h b/libavformat/movenc.h index c9b4072fb9..f2967bface 100644 --- a/libavformat/movenc.h +++ b/libavformat/movenc.h @@ -46,6 +46,7 @@ typedef struct MOVIentry { uint64_t pos; int64_t dts; + int64_t pts; unsigned int size; unsigned int samples_in_chunk; unsigned int chunkNum; ///< Chunk number if the current entry is a chunk start otherwise 0 @@ -169,6 +170,13 @@ typedef enum { MOV_ENC_CENC_AES_CTR, } MOVEncryptionScheme; +typedef enum { + MOV_PRFT_NONE = 0, + MOV_PRFT_SRC_WALLCLOCK, + MOV_PRFT_SRC_PTS, + MOV_PRFT_NB +} MOVPrftBox; + typedef struct MOVMuxContext { const AVClass *av_class; int mode; @@ -224,6 +232,7 @@ typedef struct MOVMuxContext { int use_stream_ids_as_track_ids; int track_ids_ok; int write_tmcd; + MOVPrftBox write_prft; } MOVMuxContext; #define FF_MOV_FLAG_RTP_HINT (1 << 0) |