Changeset 2931:b35c453d35e9 in roaraudio for libroardsp

Timestamp:

10/16/09 21:10:17 (15 years ago)

Author:

phi

Branch:

default

Phase:

public

Message:

code for PCM mixer

File:

• libroardsp/mixer.c (modified) (1 diff)

libroardsp/mixer.c

@@ -25 +25 @@
 #include "libroardsp.h"
 
+int roar_mix_pcm       (void    * output, int bits, void ** input, int samples) {
+ switch (bits) {
+  case  8: return roar_mix_pcm_8bit (output, (int8_t  **)input, samples); break;
+  case 16: return roar_mix_pcm_16bit(output, (int16_t **)input, samples); break;
+  case 24: return roar_mix_pcm_24bit(output, input, samples); break;
+  case 32: return roar_mix_pcm_32bit(output, (int32_t **)input, samples); break;
+  default: return -1;
+ }
+}
+
+int roar_mix_pcm_8bit  (int8_t  * output, int8_t  ** input, int samples) {
+ int i, s;
+ register int c;
+
+ for (s = 0; s < samples; s++) {
+  c = 0;
+
+  for (i = 0; input[i] != NULL; i++)
+   c += input[i][s];
+
+  if ( c > 127 )
+   c = 127;
+  else if ( c < -128 )
+   c = -128;
+  output[s] = (char)c;
+ }
+
+ return 0;
+}
+
+int roar_mix_pcm_16bit (int16_t * output, int16_t ** input, int samples) {
+ int i, s;
+ register int_least32_t c;
+
+#ifdef DEBUG
+ for (i = 0; input[i] != NULL; i++)
+  ROAR_DBG("mix_clients_16bit(*): input[%i] = %p", i, input[i]);
+#endif
+
+ for (s = 0; s < samples; s++) {
+  c = 0;
+  for (i = 0; input[i] != NULL; i++) {
+   c += input[i][s];
+  }
+
+  if ( c > 32767 )
+   c = 32767;
+  else if ( c < -32768 )
+   c = -32768;
+
+  output[s] = c;
+ }
+
+ return 0;
+}
+
+int roar_mix_pcm_24bit (void    * output, void    ** input, int samples) {
+ return -1;
+}
+
+int roar_mix_pcm_32bit (int32_t * output, int32_t ** input, int samples) {
+#ifdef ROAR_NATIVE_INT64
+ int i, s;
+ ROAR_NATIVE_INT64 c;
+
+ for (s = 0; s < samples; s++) {
+  c = 0;
+
+  for (i = 0; input[i]; i++)
+   c += input[i][s];
+
+  if ( c > 21474836487LL )
+   c = 2147483647LL;
+  else if ( c < -2147483648LL )
+   c = -2147483648LL;
+  output[s] = (int32_t)c;
+ }
+
+ return  0;
+#else
+ return -1;
+#endif
+}
+
 
 //ll