Add declarations for the sine tables used in wma.c (half window sizes…

…: 128,

256, 512, 1024 and 2048) to mdct.c. Make them accessible via dsputil.h. Make
wma.c use these shared tables.

Originally committed as revision 14758 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/dsputil.h

@@ -702,6 +702,12 @@ void ff_kbd_window_init(float *window, float alpha, int n);
  * @param   n       size of half window
  */
 void ff_sine_window_init(float *window, int n);
+extern float ff_sine_128 [ 128];
+extern float ff_sine_256 [ 256];
+extern float ff_sine_512 [ 512];
+extern float ff_sine_1024[1024];
+extern float ff_sine_2048[2048];
+extern float *ff_sine_windows[5];
 
 int ff_mdct_init(MDCTContext *s, int nbits, int inverse);
 void ff_imdct_calc_c(MDCTContext *s, FFTSample *output, const FFTSample *input);

libavcodec/mdct.c

@@ -48,6 +48,15 @@ void ff_kbd_window_init(float *window, float alpha, int n)
        window[i] = sqrt(local_window[i] / sum);
 }
 
+float ff_sine_128 [ 128];
+float ff_sine_256 [ 256];
+float ff_sine_512 [ 512];
+float ff_sine_1024[1024];
+float ff_sine_2048[2048];
+float *ff_sine_windows[5] = {
+    ff_sine_128, ff_sine_256, ff_sine_512, ff_sine_1024, ff_sine_2048,
+};
+
 // Generate a sine window.
 void ff_sine_window_init(float *window, int n) {
     int i;

libavcodec/wma.c

@@ -66,7 +66,6 @@ int ff_wma_init(AVCodecContext * avctx, int flags2)
 {
     WMACodecContext *s = avctx->priv_data;
     int i;
-    float *window;
     float bps1, high_freq;
     volatile float bps;
     int sample_rate1;
@@ -303,9 +302,8 @@ int ff_wma_init(AVCodecContext * avctx, int flags2)
     for(i = 0; i < s->nb_block_sizes; i++) {
         int n;
         n = 1 << (s->frame_len_bits - i);
-        window = av_malloc(sizeof(float) * n);
-        ff_sine_window_init(window, n);
-        s->windows[i] = window;
+        ff_sine_window_init(ff_sine_windows[i], n);
+        s->windows[i] = ff_sine_windows[i];
     }
 
     s->reset_block_lengths = 1;