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Code Issues Releases Activity

avformat/mxfenc: correctly set content package rate in system element

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This commit is contained in:
Baptiste Coudurier 2018-03-21 13:13:51 -07:00
parent 84e8a87ca0
commit bb89109a0a
4 changed files with 23 additions and 2 deletions
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17
libavformat/mxf.c
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@ -171,3 +171,20 @@ const MXFSamplesPerFrame *ff_mxf_get_samples_per_frame(AVFormatContext *s,
return &mxf_spf[idx];
}
static const int mxf_content_package_rates[] = {
3, 2, 7, 13, 4, 10, 12,
};
int ff_mxf_get_content_package_rate(AVRational time_base)
{
int idx = av_find_nearest_q_idx(time_base, mxf_time_base);
AVRational diff = av_sub_q(time_base, mxf_time_base[idx]);
diff.num = FFABS(diff.num);
if (av_cmp_q(diff, (AVRational){1, 1000}) >= 0)
return -1;
return mxf_content_package_rates[idx];
}

2
libavformat/mxf.h
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@ -93,6 +93,8 @@ extern const MXFCodecUL ff_mxf_codec_tag_uls[];
int ff_mxf_decode_pixel_layout(const char pixel_layout[16], enum AVPixelFormat *pix_fmt);
const MXFSamplesPerFrame *ff_mxf_get_samples_per_frame(AVFormatContext *s, AVRational time_base);
int ff_mxf_get_content_package_rate(AVRational time_base);
#define PRIxUID \
"%02x.%02x.%02x.%02x." \

4
libavformat/mxfenc.c
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@ -416,6 +416,7 @@ typedef struct MXFContext {
AVStream *timecode_track;
int timecode_base; ///< rounded time code base (25 or 30)
int edit_unit_byte_count; ///< fixed edit unit byte count
int content_package_rate; ///< content package rate in system element, see SMPTE 326M
uint64_t body_offset;
uint32_t instance_number;
uint8_t umid[16]; ///< unique material identifier
@ -2462,6 +2463,7 @@ static int mxf_write_header(AVFormatContext *s)
tbc.den, tbc.num);
return AVERROR(EINVAL);
}
mxf->content_package_rate = ff_mxf_get_content_package_rate(tbc);
mxf->time_base = spf->time_base;
rate = av_inv_q(mxf->time_base);
avpriv_set_pts_info(st, 64, mxf->time_base.num, mxf->time_base.den);
@ -2630,7 +2632,7 @@ static void mxf_write_system_item(AVFormatContext *s)
avio_write(pb, system_metadata_pack_key, 16);
klv_encode_ber4_length(pb, 57);
avio_w8(pb, 0x5c); // UL, user date/time stamp, picture and sound item present
avio_w8(pb, 0x04); // content package rate
avio_w8(pb, mxf->content_package_rate); // content package rate
avio_w8(pb, 0x00); // content package type
avio_wb16(pb, 0x00); // channel handle
avio_wb16(pb, (mxf->tc.start + frame) & 0xFFFF); // continuity count, supposed to overflow

2
tests/ref/lavf/mxf
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@ -1,7 +1,7 @@
649009e3d3d62eb3b6c56334d057cc4d *./tests/data/lavf/lavf.mxf
526393 ./tests/data/lavf/lavf.mxf
./tests/data/lavf/lavf.mxf CRC=0x8dddfaab
5025d7f79b638166b787b3cb8364e5d9 *./tests/data/lavf/lavf.mxf
9076b7015cffe8aa72883e900a2041a5 *./tests/data/lavf/lavf.mxf
561721 ./tests/data/lavf/lavf.mxf
./tests/data/lavf/lavf.mxf CRC=0x96ff1b48
02bf8f0cd8951a49e277306691cb1538 *./tests/data/lavf/lavf.mxf