adpcm: fix clipping for yamaha

According to specification max value allowed is 0x6000.
Fixes #5862.

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

libavcodec/adpcm.c

@@ -343,7 +343,7 @@ static inline int16_t adpcm_yamaha_expand_nibble(ADPCMChannelStatus *c, uint8_t
     c->predictor += (c->step * ff_adpcm_yamaha_difflookup[nibble]) / 8;
     c->predictor = av_clip_int16(c->predictor);
     c->step = (c->step * ff_adpcm_yamaha_indexscale[nibble]) >> 8;
-    c->step = av_clip(c->step, 127, 24567);
+    c->step = av_clip(c->step, 127, 24576);
     return c->predictor;
 }
 

libavcodec/adpcmenc.c

@@ -258,7 +258,7 @@ static inline uint8_t adpcm_yamaha_compress_sample(ADPCMChannelStatus *c,
     c->predictor += ((c->step * ff_adpcm_yamaha_difflookup[nibble]) / 8);
     c->predictor = av_clip_int16(c->predictor);
     c->step = (c->step * ff_adpcm_yamaha_indexscale[nibble]) >> 8;
-    c->step = av_clip(c->step, 127, 24567);
+    c->step = av_clip(c->step, 127, 24576);
 
     return nibble;
 }
@@ -415,7 +415,7 @@ static void adpcm_compress_trellis(AVCodecContext *avctx,
             } else { //AV_CODEC_ID_ADPCM_YAMAHA
                 LOOP_NODES(yamaha, step,
                            av_clip((step * ff_adpcm_yamaha_indexscale[nibble]) >> 8,
-                                   127, 24567));
+                                   127, 24576));
 #undef LOOP_NODES
 #undef STORE_NODE
             }

tests/ref/acodec/adpcm-yamaha

@@ -1,4 +1,4 @@
-e9c14f701d25947317db9367b9dc772d *tests/data/fate/acodec-adpcm-yamaha.wav
+245c194e84d482a70ca89de9c0bbd591 *tests/data/fate/acodec-adpcm-yamaha.wav
 265274 tests/data/fate/acodec-adpcm-yamaha.wav
-93b95a663ec8799e0c4db18467b21234 *tests/data/fate/acodec-adpcm-yamaha.out.wav
-stddev: 1247.60 PSNR: 34.41 MAXDIFF:39895 bytes:  1058400/  1060864
+758b4aee62964831d0a335ada9672104 *tests/data/fate/acodec-adpcm-yamaha.out.wav
+stddev: 1242.71 PSNR: 34.44 MAXDIFF:39960 bytes:  1058400/  1060864

tests/ref/acodec/adpcm-yamaha-trellis

@@ -1,4 +1,4 @@
-247a06c3f26c57abd2db1a793174cb66 *tests/data/fate/acodec-adpcm-yamaha-trellis.wav
+c8306ada93ef52b1e87b6758853f4937 *tests/data/fate/acodec-adpcm-yamaha-trellis.wav
 265274 tests/data/fate/acodec-adpcm-yamaha-trellis.wav
-a42b5fa74b39a07691b0df80ce67f77e *tests/data/fate/acodec-adpcm-yamaha-trellis.out.wav
-stddev:  928.29 PSNR: 36.98 MAXDIFF:33557 bytes:  1058400/  1060864
+8ad27b0ea7e13e70ed334b5ec26c62ef *tests/data/fate/acodec-adpcm-yamaha-trellis.out.wav
+stddev:  926.56 PSNR: 36.99 MAXDIFF:33570 bytes:  1058400/  1060864