Set the step index correctly for flash adpcm. Patch by Baptiste

Coudurier.

Originally committed as revision 9743 to svn://svn.ffmpeg.org/ffmpeg/trunk

diff --git a/libavcodec/adpcm.c b/libavcodec/adpcm.c
index 5539cf9..9111a7a 100644 (file)
--- a/libavcodec/adpcm.c
+++ b/libavcodec/adpcm.c
@@ -531,8 +531,9 @@ static int adpcm_encode_frame(AVCodecContext *avctx,
 
         //Init the encoder state
         for(i=0; i<avctx->channels; i++){
+            c->status[i].step_index = av_clip(c->status[i].step_index, 0, 63); // clip step so it fits 6 bits
             put_bits(&pb, 16, samples[i] & 0xFFFF);
-            put_bits(&pb, 6, c->status[i].step_index & 0x3F);
+            put_bits(&pb, 6, c->status[i].step_index);
             c->status[i].prev_sample = (signed short)samples[i];
         }