Initial Ogg Vorbis sounds effect support.

1 files changed, 27 insertions, 4 deletions

diff --git a/src/audio/pcm.cc b/src/audio/pcm.cc
index b04e080..2ef7381 100644
--- a/src/audio/pcm.cc
+++ b/src/audio/pcm.cc
@@ -7,6 +7,8 @@
 #include <stdlib.h>
 #include <string.h>
 
+#include <cassert>
+
 #include "audio/pcm.h"
 #include "audio/wavfile.h"
 
@@ -15,12 +17,12 @@ namespace audio
 
 PCM::PCM(unsigned int samplerate, unsigned int bitspersample, unsigned int channels, size_t size)
 {
+	pcm_size = size;
+	pcm_buff_size = size;
 	pcm_bitspersample = bitspersample;
 	pcm_samplerate = samplerate;
-	pcm_size = size;
 	pcm_channels = channels;
-
-	pcm_data = (unsigned char *) malloc(pcm_size);
+	pcm_data = (unsigned char *) malloc(pcm_buff_size);
 	clear();
 }
 
@@ -31,7 +33,28 @@ PCM::~PCM()
 
 void PCM::clear()
 {
-	memset(pcm_data, 0, pcm_size);
+	memset(pcm_data, 0, pcm_buff_size);
 }
 
+void PCM::set_size(size_t size) {
+	assert(size <= pcm_buff_size);
+	pcm_size = size;
+}
+
+void PCM::grow(size_t size) {
+	assert (size >= pcm_buff_size);
+	
+	// store a pointer to the previous buffer
+	unsigned char *old_data = pcm_data;
+	
+	// allocate a new, larger buffer
+	pcm_buff_size = size;
+	pcm_data = (unsigned char *) malloc(pcm_buff_size);
+	
+	// copy the content
+	memcpy(pcm_data, old_data, pcm_size);
+	
+	free(old_data);	
 }
+
+} // namespace audio