sipr: use a function pointer to select the decode_frame function

libavcodec/sipr.c

@@ -492,8 +492,12 @@ static av_cold int sipr_decoder_init(AVCodecContext * avctx)
 
     av_log(avctx, AV_LOG_DEBUG, "Mode: %s\n", modes[ctx->mode].mode_name);
 
-    if (ctx->mode == MODE_16k)
+    if (ctx->mode == MODE_16k) {
         ff_sipr_init_16k(ctx);
+        ctx->decode_frame = ff_sipr_decode_frame_16k;
+    } else {
+        ctx->decode_frame = decode_frame;
+    }
 
     for (i = 0; i < LP_FILTER_ORDER; i++)
         ctx->lsp_history[i] = cos((i+1) * M_PI / (LP_FILTER_ORDER + 1));
@@ -541,10 +545,7 @@ static int sipr_decode_frame(AVCodecContext *avctx, void *datap,
     for (i = 0; i < mode_par->frames_per_packet; i++) {
         decode_parameters(&parm, &gb, mode_par);
 
-        if (ctx->mode == MODE_16k)
-            ff_sipr_decode_frame_16k(ctx, &parm, data);
-        else
-            decode_frame(ctx, &parm, data);
+        ctx->decode_frame(ctx, &parm, data);
 
         data += subframe_size * mode_par->subframe_count;
     }

libavcodec/sipr.h

@@ -53,8 +53,18 @@ typedef enum {
     MODE_COUNT
 } SiprMode;
 
-typedef struct {
+typedef struct SiprParameters {
+    int ma_pred_switch;        ///< switched moving average predictor
+    int vq_indexes[5];
+    int pitch_delay[5];        ///< pitch delay
+    int gp_index[5];           ///< adaptive-codebook gain indexes
+    int16_t fc_indexes[5][10]; ///< fixed-codebook indexes
+    int gc_index[5];           ///< fixed-codebook gain indexes
+} SiprParameters;
+
+typedef struct SiprContext {
     AVCodecContext *avctx;
+    AVFrame frame;
 
     SiprMode mode;
 
@@ -85,16 +95,10 @@ typedef struct {
     float mem_preemph[LP_FILTER_ORDER_16k];
     float synth[LP_FILTER_ORDER_16k];
     double lsp_history_16k[16];
-} SiprContext;
 
-typedef struct {
-    int ma_pred_switch;        ///< switched moving average predictor
-    int vq_indexes[5];
-    int pitch_delay[5];        ///< pitch delay
-    int gp_index[5];           ///< adaptive-codebook gain indexes
-    int16_t fc_indexes[5][10]; ///< fixed-codebook indexes
-    int gc_index[5];           ///< fixed-codebook gain indexes
-} SiprParameters;
+    void (*decode_frame)(struct SiprContext *ctx, SiprParameters *params,
+                         float *out_data);
+} SiprContext;
 
 extern const float ff_pow_0_5[16];