mlpdec: Split filter_state_buffer into [fi]irbuf and fp to [fi]ir.

Originally committed as revision 18232 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/mlpdec.c

@@ -652,17 +652,18 @@ static void filter_channel(MLPDecodeContext *m, unsigned int substr,
                            unsigned int channel)
 {
     SubStream *s = &m->substream[substr];
-    int32_t filter_state_buffer[NUM_FILTERS][MAX_BLOCKSIZE + MAX_FIR_ORDER];
-    FilterParams *fp[NUM_FILTERS] = { &m->channel_params[channel].filter_params[FIR],
-                                      &m->channel_params[channel].filter_params[IIR], };
-    unsigned int filter_shift = fp[FIR]->shift;
+    int32_t firbuf[MAX_BLOCKSIZE + MAX_FIR_ORDER];
+    int32_t iirbuf[MAX_BLOCKSIZE + MAX_IIR_ORDER];
+    FilterParams *fir = &m->channel_params[channel].filter_params[FIR];
+    FilterParams *iir = &m->channel_params[channel].filter_params[IIR];
+    unsigned int filter_shift = fir->shift;
     int32_t mask = MSB_MASK(s->quant_step_size[channel]);
     int index = MAX_BLOCKSIZE;
     int i;
 
-    memcpy(&filter_state_buffer[FIR][MAX_BLOCKSIZE], &fp[FIR]->state[0],
+    memcpy(&firbuf[MAX_BLOCKSIZE], &fir->state[0],
             MAX_FIR_ORDER * sizeof(int32_t));
-    memcpy(&filter_state_buffer[IIR][MAX_BLOCKSIZE], &fp[IIR]->state[0],
+    memcpy(&iirbuf[MAX_BLOCKSIZE], &iir->state[0],
             MAX_IIR_ORDER * sizeof(int32_t));
 
     for (i = 0; i < s->blocksize; i++) {
@@ -673,27 +674,27 @@ static void filter_channel(MLPDecodeContext *m, unsigned int substr,
 
         /* TODO: Move this code to DSPContext? */
 
-        for (order = 0; order < fp[FIR]->order; order++)
-            accum += (int64_t)filter_state_buffer[FIR][index + order] *
-                                fp[FIR]->coeff[order];
-        for (order = 0; order < fp[IIR]->order; order++)
-            accum += (int64_t)filter_state_buffer[IIR][index + order] *
-                                fp[IIR]->coeff[order];
+        for (order = 0; order < fir->order; order++)
+            accum += (int64_t)firbuf[index + order] *
+                                fir->coeff[order];
+        for (order = 0; order < iir->order; order++)
+            accum += (int64_t)iirbuf[index + order] *
+                                iir->coeff[order];
 
         accum  = accum >> filter_shift;
         result = (accum + residual) & mask;
 
         --index;
 
-        filter_state_buffer[FIR][index] = result;
-        filter_state_buffer[IIR][index] = result - accum;
+        firbuf[index] = result;
+        iirbuf[index] = result - accum;
 
         m->sample_buffer[i + s->blockpos][channel] = result;
     }
 
-    memcpy(&fp[FIR]->state[0], &filter_state_buffer[FIR][index],
+    memcpy(&fir->state[0], &firbuf[index],
             MAX_FIR_ORDER * sizeof(int32_t));
-    memcpy(&fp[IIR]->state[0], &filter_state_buffer[IIR][index],
+    memcpy(&iir->state[0], &iirbuf[index],
             MAX_IIR_ORDER * sizeof(int32_t));
 }