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

libavformat/mxf.c

@@ -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];
+}

libavformat/mxf.h

@@ -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."                  \

libavformat/mxfenc.c

@@ -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

tests/ref/lavf/mxf

 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