avformat/mxfenc: factorize timecode checking and setting

Signed-off-by: Marton Balint <cus@passwd.hu>

libavformat/mxfenc.c

@@ -2407,17 +2407,24 @@ static void mxf_gen_umid(AVFormatContext *s)
     mxf->instance_number = seed & 0xFFFFFF;
 }
 
-static int mxf_init_timecode(AVFormatContext *s, AVStream *st, AVRational rate)
+static int mxf_init_timecode(AVFormatContext *s, AVStream *st, AVRational tbc)
 {
     MXFContext *mxf = s->priv_data;
     AVDictionaryEntry *tcr = av_dict_get(s->metadata, "timecode", NULL, 0);
+
+    if (!ff_mxf_get_content_package_rate(tbc)) {
+        av_log(s, AV_LOG_ERROR, "Unsupported frame rate %d/%d\n", tbc.den, tbc.num);
+        return AVERROR(EINVAL);
+    }
+
+    mxf->timecode_base = (tbc.den + tbc.num/2) / tbc.num;
     if (!tcr)
         tcr = av_dict_get(st->metadata, "timecode", NULL, 0);
 
     if (tcr)
-        return av_timecode_init_from_string(&mxf->tc, rate, tcr->value, s);
+        return av_timecode_init_from_string(&mxf->tc, av_inv_q(tbc), tcr->value, s);
     else
-        return av_timecode_init(&mxf->tc, rate, 0, 0, s);
+        return av_timecode_init(&mxf->tc, av_inv_q(tbc), 0, 0, s);
 }
 
 static int mxf_write_header(AVFormatContext *s)
@@ -2454,7 +2461,7 @@ static int mxf_write_header(AVFormatContext *s)
         if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
             const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(st->codecpar->format);
             // TODO: should be avg_frame_rate
-            AVRational rate, tbc = st->time_base;
+            AVRational tbc = st->time_base;
             // Default component depth to 8
             sc->component_depth = 8;
             sc->h_chroma_sub_sample = 2;
@@ -2479,16 +2486,9 @@ static int mxf_write_header(AVFormatContext *s)
             }
 
             mxf->content_package_rate = ff_mxf_get_content_package_rate(tbc);
-            if (!mxf->content_package_rate) {
-                av_log(s, AV_LOG_ERROR, "Unsupported video frame rate %d/%d\n",
-                       tbc.den, tbc.num);
-                return AVERROR(EINVAL);
-            }
-            mxf->timecode_base = (tbc.den + tbc.num/2) / tbc.num;
             mxf->time_base = tbc;
-            rate = av_inv_q(mxf->time_base);
             avpriv_set_pts_info(st, 64, mxf->time_base.num, mxf->time_base.den);
-            if((ret = mxf_init_timecode(s, st, rate)) < 0)
+            if((ret = mxf_init_timecode(s, st, tbc)) < 0)
                 return ret;
 
             if (st->codecpar->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
@@ -2564,16 +2564,10 @@ static int mxf_write_header(AVFormatContext *s)
                     return AVERROR(EINVAL);
                 }
 
-                if (!ff_mxf_get_content_package_rate(tbc)) {
-                    av_log(s, AV_LOG_ERROR, "Unsupported timecode frame rate %d/%d\n", tbc.den, tbc.num);
-                    return AVERROR(EINVAL);
-                }
-
                 mxf->time_base = st->time_base;
-                if((ret = mxf_init_timecode(s, st, av_inv_q(tbc))) < 0)
+                if((ret = mxf_init_timecode(s, st, tbc)) < 0)
                     return ret;
 
-                mxf->timecode_base = (tbc.den + tbc.num/2) / tbc.num;
                 mxf->edit_unit_byte_count = (av_get_bits_per_sample(st->codecpar->codec_id) * st->codecpar->channels) >> 3;
                 sc->index = INDEX_WAV;
             } else {