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