swr: fix mix* related function pointer warnings

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libswresample/rematrix.c

@@ -308,9 +308,9 @@ int swri_rematrix_init(SwrContext *s){
             for (j = 0; j < nb_in; j++)
                 ((int*)s->native_matrix)[i * nb_in + j] = lrintf(s->matrix[i][j] * 32768);
         *((int*)s->native_one) = 32768;
-        s->mix_1_1_f = copy_s16;
-        s->mix_2_1_f = sum2_s16;
-        s->mix_any_f = get_mix_any_func_s16(s);
+        s->mix_1_1_f = (mix_1_1_func_type*)copy_s16;
+        s->mix_2_1_f = (mix_2_1_func_type*)sum2_s16;
+        s->mix_any_f = (mix_any_func_type*)get_mix_any_func_s16(s);
     }else if(s->midbuf.fmt == AV_SAMPLE_FMT_FLTP){
         s->native_matrix = av_mallocz(nb_in * nb_out * sizeof(float));
         s->native_one    = av_mallocz(sizeof(float));
@@ -318,9 +318,9 @@ int swri_rematrix_init(SwrContext *s){
             for (j = 0; j < nb_in; j++)
                 ((float*)s->native_matrix)[i * nb_in + j] = s->matrix[i][j];
         *((float*)s->native_one) = 1.0;
-        s->mix_1_1_f = copy_float;
-        s->mix_2_1_f = sum2_float;
-        s->mix_any_f = get_mix_any_func_float(s);
+        s->mix_1_1_f = (mix_1_1_func_type*)copy_float;
+        s->mix_2_1_f = (mix_2_1_func_type*)sum2_float;
+        s->mix_any_f = (mix_any_func_type*)get_mix_any_func_float(s);
     }else if(s->midbuf.fmt == AV_SAMPLE_FMT_DBLP){
         s->native_matrix = av_mallocz(nb_in * nb_out * sizeof(double));
         s->native_one    = av_mallocz(sizeof(double));
@@ -328,9 +328,9 @@ int swri_rematrix_init(SwrContext *s){
             for (j = 0; j < nb_in; j++)
                 ((double*)s->native_matrix)[i * nb_in + j] = s->matrix[i][j];
         *((double*)s->native_one) = 1.0;
-        s->mix_1_1_f = copy_double;
-        s->mix_2_1_f = sum2_double;
-        s->mix_any_f = get_mix_any_func_double(s);
+        s->mix_1_1_f = (mix_1_1_func_type*)copy_double;
+        s->mix_2_1_f = (mix_2_1_func_type*)sum2_double;
+        s->mix_any_f = (mix_any_func_type*)get_mix_any_func_double(s);
     }else
         av_assert0(0);
     //FIXME quantize for integeres

libswresample/rematrix_template.c

@@ -18,6 +18,7 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+typedef void (RENAME(mix_any_func_type))(SAMPLE **out, const SAMPLE **in1, COEFF *coeffp, int len);
 
 static void RENAME(sum2)(SAMPLE *out, const SAMPLE *in1, const SAMPLE *in2, COEFF *coeffp, int index1, int index2, int len){
     int i;
@@ -55,7 +56,7 @@ static void RENAME(mix8to2)(SAMPLE **out, const SAMPLE **in, COEFF *coeffp, int
     }
 }
 
-static mix_any_func_type *RENAME(get_mix_any_func)(SwrContext *s){
+static RENAME(mix_any_func_type) *RENAME(get_mix_any_func)(SwrContext *s){
     if(   s->out_ch_layout == AV_CH_LAYOUT_STEREO && (s->in_ch_layout == AV_CH_LAYOUT_5POINT1 || s->in_ch_layout == AV_CH_LAYOUT_5POINT1_BACK)
        && s->matrix[0][2] == s->matrix[1][2] && s->matrix[0][3] == s->matrix[1][3]
        && !s->matrix[0][1] && !s->matrix[0][5] && !s->matrix[1][0] && !s->matrix[1][4]