mux/nut: factorize ff_choose_timebase() out of nut

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

1 files changed, 19 insertions, 0 deletions

diff --git a/libavformat/mux.c b/libavformat/mux.c
index debc6a16b9..cd5481f1d2 100644
--- a/libavformat/mux.c
+++ b/libavformat/mux.c
@@ -103,6 +103,25 @@ static void frac_add(AVFrac *f, int64_t incr)
     f->num = num;
 }
 
+AVRational ff_choose_timebase(AVFormatContext *s, AVStream *st, int min_precission)
+{
+    AVRational q;
+    int j;
+
+    if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
+        q = (AVRational){1, st->codec->sample_rate};
+    } else {
+        q = st->codec->time_base;
+    }
+    for (j=2; j<2000; j+= 1+(j>2))
+        while (q.den / q.num < min_precission && q.num % j == 0)
+            q.num /= j;
+    while (q.den / q.num < min_precission && q.den < (1<<24))
+        q.den <<= 1;
+
+    return q;
+}
+
 int avformat_alloc_output_context2(AVFormatContext **avctx, AVOutputFormat *oformat,
                                    const char *format, const char *filename)
 {