+int avpriv_check_timecode_rate(void *avcl, AVRational rate, int drop)
+{
+ int fps;
+
+ if (!rate.num || !rate.den) {
+ av_log(avcl, AV_LOG_ERROR, "Timecode frame rate must be specified\n");
+ return -1;
+ }
+ fps = (rate.num + rate.den/2) / rate.den;
+ if (drop && fps != 30) {
+ av_log(avcl, AV_LOG_ERROR, "Drop frame is only allowed with 30000/1001 FPS\n");
+ return -2;
+ }
+ switch (fps) {
+ case 24:
+ case 25:
+ case 30: return 0;
+
+ default:
+ av_log(avcl, AV_LOG_ERROR, "Timecode frame rate not supported\n");
+ return -3;
+ }
+}
+
+char *avpriv_timecode_to_string(char *buf, const struct ff_timecode *tc, unsigned frame)
+{
+ int frame_num = tc->start + frame;
+ int fps = (tc->rate.num + tc->rate.den/2) / tc->rate.den;
+ int hh, mm, ss, ff, neg = 0;
+
+ if (tc->drop)
+ frame_num = avpriv_framenum_to_drop_timecode(frame_num);
+ if (frame_num < 0) {
+ frame_num = -frame_num;
+ neg = 1;
+ }
+ ff = frame_num % fps;
+ ss = frame_num / fps % 60;
+ mm = frame_num / (fps*60) % 60;
+ hh = frame_num / (fps*3600);
+ snprintf(buf, 16, "%s%02d:%02d:%02d%c%02d",
+ neg ? "-" : "",
+ hh, mm, ss, tc->drop ? ';' : ':', ff);
+ return buf;
+}
+
+int avpriv_init_smpte_timecode(void *avcl, struct ff_timecode *tc)