pcm: pass void pointers to PCM functions

In generic PCM functions allowing all sample formats, pass a void
pointer instead of a char pointer.

src/pcm_convert.c

@@ -117,21 +117,20 @@ pcm_convert_24(const struct audio_format *src_format,
 	return len;
 }
 
-/* outFormat bits must be 16 and channels must be 1 or 2! */
 size_t pcm_convert(const struct audio_format *inFormat,
-		   const char *src, size_t src_size,
+		   const void *src, size_t src_size,
 		   const struct audio_format *outFormat,
-		   char *outBuffer,
+		   void *dest,
 		   struct pcm_convert_state *convState)
 {
 	switch (outFormat->bits) {
 	case 16:
 		return pcm_convert_16(inFormat, src, src_size,
-				      outFormat, (int16_t*)outBuffer,
+				      outFormat, (int16_t*)dest,
 				      convState);
 	case 24:
 		return pcm_convert_24(inFormat, src, src_size,
-				      outFormat, (int32_t*)outBuffer,
+				      outFormat, (int32_t*)dest,
 				      convState);
 
 	default:

src/pcm_convert.h

@@ -33,9 +33,9 @@ struct pcm_convert_state {
 void pcm_convert_init(struct pcm_convert_state *state);
 
 size_t pcm_convert(const struct audio_format *inFormat,
-		   const char *inBuffer, size_t inSize,
+		   const void *src, size_t src_size,
 		   const struct audio_format *outFormat,
-		   char *outBuffer,
+		   void *dest,
 		   struct pcm_convert_state *convState);
 
 size_t pcm_convert_size(const struct audio_format *inFormat, size_t inSize,

src/pcm_mix.c

@@ -80,7 +80,7 @@ pcm_add_24(int32_t *buffer1, const int32_t *buffer2,
 }
 
 static void
-pcm_add(char *buffer1, const char *buffer2, size_t size,
+pcm_add(void *buffer1, const void *buffer2, size_t size,
 	int vol1, int vol2,
 	const struct audio_format *format)
 {
@@ -107,7 +107,7 @@ pcm_add(char *buffer1, const char *buffer2, size_t size,
 }
 
 void
-pcm_mix(char *buffer1, const char *buffer2, size_t size,
+pcm_mix(void *buffer1, const void *buffer2, size_t size,
 	const struct audio_format *format, float portion1)
 {
 	int vol1;

src/pcm_mix.h

@@ -24,7 +24,7 @@
 struct audio_format;
 
 void
-pcm_mix(char *buffer1, const char *buffer2, size_t size,
+pcm_mix(void *buffer1, const void *buffer2, size_t size,
 	const struct audio_format *format, float portion1);
 
 #endif

src/pcm_volume.c

@@ -74,7 +74,7 @@ pcm_volume_change_24(int32_t *buffer, unsigned num_samples, int volume)
 }
 
 void
-pcm_volume(char *buffer, int bufferSize,
+pcm_volume(void *buffer, int bufferSize,
 	   const struct audio_format *format,
 	   int volume)
 {

src/pcm_volume.h

@@ -52,7 +52,7 @@ pcm_volume_dither(void)
 }
 
 void
-pcm_volume(char *buffer, int bufferSize,
+pcm_volume(void *buffer, int bufferSize,
 	   const struct audio_format *format,
 	   int volume);