adxenc: use a loop to encode each channel

libavcodec/adxenc.c

@@ -128,6 +128,7 @@ static int adx_encode_frame(AVCodecContext *avctx, uint8_t *frame,
     ADXContext *c          = avctx->priv_data;
     const int16_t *samples = data;
     uint8_t *dst           = frame;
+    int ch;
 
     if (!c->header_parsed) {
         int hdrsize = adx_encode_header(avctx, dst, buf_size);
@@ -135,13 +136,9 @@ static int adx_encode_frame(AVCodecContext *avctx, uint8_t *frame,
         c->header_parsed = 1;
     }
 
-    if (avctx->channels == 1) {
-            adx_encode(c, dst, samples, c->prev, avctx->channels);
-            dst     += 18;
-    } else {
-            adx_encode(c, dst,      samples,     c->prev,     avctx->channels);
-            adx_encode(c, dst + 18, samples + 1, c->prev + 1, avctx->channels);
-            dst     += 18*2;
+    for (ch = 0; ch < avctx->channels; ch++) {
+        adx_encode(c, dst, samples + ch, &c->prev[ch], avctx->channels);
+        dst += 18;
     }
     return dst - frame;
 }