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#include <algorithm>
#include <limits>
#include "sox_audio_source.h"
using namespace std;
static const size_t kBufferSize = 2 * 4096;
bool SoxAudioSource::initialized_ = false;
SoxAudioSource::SoxAudioSource(const string &file_name)
: format_(0), file_name_(file_name)
{
if (!initialized_) {
sox_init();
initialized_ = true;
}
buffer_ = new sox_sample_t[kBufferSize];
}
SoxAudioSource::~SoxAudioSource()
{
Close();
delete[] buffer_;
}
bool SoxAudioSource::Open()
{
Close();
format_ = sox_open_read(file_name_.c_str(), NULL, NULL, NULL);
return format_ != 0;
}
void SoxAudioSource::Close()
{
if (format_) {
sox_close(format_);
format_ = 0;
}
}
int SoxAudioSource::SampleRate()
{
return static_cast<int>(format_->signal.rate);
}
int SoxAudioSource::Channels()
{
return format_->signal.channels;
}
std::size_t SoxAudioSource::Read(short *buffer, std::size_t size)
{
size_t remaining = size;
short *ptr = buffer;
while (remaining > 0) {
size_t res = sox_read(format_, buffer_, std::min(remaining, kBufferSize));
if (res == SOX_EOF || res == 0) {
break;
}
int clips = 0;
for (size_t i = 0; i < res; i++) {
// XXX assumes that short is 16-bit
SOX_SAMPLE_LOCALS;
*ptr++ = SOX_SAMPLE_TO_SIGNED_16BIT(buffer_[i], clips);
}
remaining -= res;
}
//cout << "read " << size - remaining << "\n";
return size - remaining;
}
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