Move WMA case from ff_get_audio_frame_size() to av_get_audio_frame_duration()

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

1 files changed, 7 insertions, 0 deletions

diff --git a/libavcodec/utils.c b/libavcodec/utils.c
index 4531311f63..b3715a95de 100644
--- a/libavcodec/utils.c
+++ b/libavcodec/utils.c
@@ -3310,6 +3310,13 @@ int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes)
     if (avctx->frame_size > 1 && frame_bytes)
         return avctx->frame_size;
 
+    //For WMA we currently have no other means to calculate duration thus we
+    //do it here by assuming CBR, which is true for all known cases.
+    if (avctx->bit_rate>0 && frame_bytes>0 && avctx->sample_rate>0 && avctx->block_align>1) {
+        if (avctx->codec_id == AV_CODEC_ID_WMAV1 || avctx->codec_id == AV_CODEC_ID_WMAV2)
+            return  (frame_bytes * 8LL * avctx->sample_rate) / avctx->bit_rate;
+    }
+
     return 0;
 }