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lavc/h264: create AVFrame side data from H.264 timecodes

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Create SMPTE ST 12-1 timecodes based on H.264 SEI picture timing
info.

For framerates > 30 FPS, the field flag is used in conjunction with
pairs of frames which contain the same frame timestamp in S12M.
Ensure the field is properly set per the spec.
This commit is contained in:
Devin Heitmueller
2018-06-29 14:57:13 -04:00
committed by Kieran Kunhya
parent 92c25963e8
commit 4241e44a3c
5 changed files with 76 additions and 17 deletions
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38
libavcodec/h264_slice.c
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@@ -1287,6 +1287,44 @@ static int h264_export_frame_props(H264Context *h)
h->avctx->properties |= FF_CODEC_PROPERTY_CLOSED_CAPTIONS;
}
if (h->sei.picture_timing.fulltc_received) {
uint32_t tc = 0;
uint32_t frames;
AVFrameSideData *tcside = av_frame_new_side_data(cur->f,
AV_FRAME_DATA_S12M_TIMECODE,
sizeof(uint32_t));
if (!tcside)
return AVERROR(ENOMEM);
/* For SMPTE 12-M timecodes, frame count is a special case if > 30 FPS.
See SMPTE ST 12-1:2014 Sec 12.1 for more info. */
if (av_cmp_q(h->avctx->framerate, (AVRational) {30, 1}) == 1) {
frames = h->sei.picture_timing.tc_frames / 2;
if (h->sei.picture_timing.tc_frames % 2 == 1) {
if (av_cmp_q(h->avctx->framerate, (AVRational) {50, 1}) == 0)
tc |= (1 << 7);
else
tc |= (1 << 23);
}
} else {
frames = h->sei.picture_timing.tc_frames;
}
tc |= h->sei.picture_timing.tc_dropframe << 30;
tc |= (frames / 10) << 28;
tc |= (frames % 10) << 24;
tc |= (h->sei.picture_timing.tc_seconds / 10) << 20;
tc |= (h->sei.picture_timing.tc_seconds % 10) << 16;
tc |= (h->sei.picture_timing.tc_minutes / 10) << 12;
tc |= (h->sei.picture_timing.tc_minutes % 10) << 8;
tc |= (h->sei.picture_timing.tc_hours / 10) << 4;
tc |= (h->sei.picture_timing.tc_hours % 10);
memcpy(tcside->data, &tc, sizeof(uint32_t));
h->sei.picture_timing.fulltc_received = 0;
}
if (h->sei.alternative_transfer.present &&
av_color_transfer_name(h->sei.alternative_transfer.preferred_transfer_characteristics) &&
h->sei.alternative_transfer.preferred_transfer_characteristics != AVCOL_TRC_UNSPECIFIED) {