diff options
| -rw-r--r-- | src/pcm_utils.c | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/src/pcm_utils.c b/src/pcm_utils.c index e7d767972..9cfb9efc3 100644 --- a/src/pcm_utils.c +++ b/src/pcm_utils.c @@ -85,7 +85,7 @@ void pcm_volumeChange(char * buffer, int bufferSize, AudioFormat * format, } void pcm_add(char * buffer1, char * buffer2, size_t bufferSize1, - size_t bufferSize2, AudioFormat * format) + size_t bufferSize2, int vol1, int vol2, AudioFormat * format) { mpd_sint32 temp32; mpd_sint8 * buffer8_1 = (mpd_sint8 *)buffer1; @@ -96,7 +96,7 @@ void pcm_add(char * buffer1, char * buffer2, size_t bufferSize1, switch(format->bits) { case 16: while(bufferSize1>0 && bufferSize2>0) { - temp32 = *buffer16_1+*buffer16_2; + temp32 = (vol1*(*buffer16_1)+vol2*(*buffer16_2))/100; *buffer16_1 = temp32>32767 ? 32767 : (temp32<-32768 ? -32768 : temp32); buffer16_1++; @@ -108,7 +108,7 @@ void pcm_add(char * buffer1, char * buffer2, size_t bufferSize1, break; case 8: while(bufferSize1>0 && bufferSize2>0) { - temp32 = *buffer8_1+*buffer8_2; + temp32 = (vol1*(*buffer8_1)+vol2*(*buffer8_2))/100; *buffer8_1 = temp32>127 ? 127 : (temp32<-128 ? -128 : temp32); buffer8_1++; @@ -127,10 +127,12 @@ void pcm_add(char * buffer1, char * buffer2, size_t bufferSize1, void pcm_mix(char * buffer1, char * buffer2, size_t bufferSize1, size_t bufferSize2, AudioFormat * format, float portion1) { + int vol1; float s = sin(M_PI_2*portion1); s*=s; + + vol1 = s*100+0.5; + vol1 = vol1>100 ? 100 : ( vol1<0 ? 0 : vol1 ); - pcm_volumeChange(buffer1,bufferSize1,format,(int)(s*100)); - pcm_volumeChange(buffer2,bufferSize2,format,(int)((1-s)*100)); - pcm_add(buffer1,buffer2,bufferSize1,bufferSize2,format); + pcm_add(buffer1,buffer2,bufferSize1,bufferSize2,vol1,100-vol1,format); } |