av_get_audio_frame_duration: add G723_1

Signed-off-by: Paul B Mahol <onemda@gmail.com>

libavcodec/utils.c

@@ -2438,6 +2438,8 @@ int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes)
             return 256 * (frame_bytes / 64);
         if (id == AV_CODEC_ID_RA_144)
             return 160 * (frame_bytes / 20);
+        if (id == AV_CODEC_ID_G723_1)
+            return 240 * (frame_bytes / 24);
 
         if (bps > 0) {
             /* calc from frame_bytes and bits_per_coded_sample */