/*
   audio/pcm.cc
   This file is part of the Osirion project and is distributed under
   the terms of the GNU General Public License version 2
*/

#include <stdlib.h>
#include <string.h>

#include <cassert>

#include "audio/pcm.h"

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_channels = channels;
	pcm_data = (unsigned char *) malloc(pcm_buff_size);
	clear();
}

PCM::~PCM()
{
	free(pcm_data);
}

void PCM::clear()
{
	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