First shot at new audio resampling code.

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%403483

src/audio/SDL_audio.c

@@ -371,6 +371,7 @@ SDL_RunAudio(void *devicep)
             silence = 0;
         }
 
+#if 0  /* !!! FIXME: I took len_div out of the structure. Use rate_incr instead? */
         /* If the result of the conversion alters the length, i.e. resampling is being used, use the streamer */
         if (device->convert.len_mult != 1 || device->convert.len_div != 1) {
             /* The streamer's maximum length should be twice whichever is larger: spec.size or len_cvt */
@@ -391,6 +392,7 @@ SDL_RunAudio(void *devicep)
                 device->spec.size * device->convert.len_div /
                 device->convert.len_mult;
         }
+#endif
 
         /* stream_len = device->convert.len; */
         stream_len = device->spec.size;

src/audio/SDL_audio_c.h

@@ -42,4 +42,15 @@ typedef struct
 } SDL_AudioTypeFilters;
 extern const SDL_AudioTypeFilters sdl_audio_type_filters[];
 
+/* this is used internally to access some autogenerated code. */
+typedef struct
+{
+    SDL_AudioFormat fmt;
+    int channels;
+    int upsample;
+    int multiple;
+    SDL_AudioFilter filter;
+} SDL_AudioRateFilters;
+extern const SDL_AudioRateFilters sdl_audio_rate_filters[];
+
 /* vi: set ts=4 sw=4 expandtab: */