RedCore/cocos2d/cocos/audio/win32/AudioDecoderOgg.cpp

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 Copyright (c) 2016-2017 Chukong Technologies Inc.

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#include "audio/win32/AudioDecoderOgg.h"
#include "audio/win32/AudioMacros.h"
#include "platform/CCFileUtils.h"

#define LOG_TAG "AudioDecoderOgg"

namespace cocos2d { namespace experimental {

    AudioDecoderOgg::AudioDecoderOgg()
    {
    }

    AudioDecoderOgg::~AudioDecoderOgg()
    {
        close();
    }

    bool AudioDecoderOgg::open(const char* path)
    {
        std::string fullPath = FileUtils::getInstance()->fullPathForFilename(path);
        if (0 == ov_fopen(fullPath.c_str(), &_vf))
        {
            // header
            vorbis_info* vi = ov_info(&_vf, -1);
            _sampleRate = static_cast<uint32_t>(vi->rate);
            _channelCount = vi->channels;
            _bytesPerFrame = vi->channels * sizeof(short);
            _totalFrames = static_cast<uint32_t>(ov_pcm_total(&_vf, -1));
            _isOpened = true;
            return true;
        }
        return false;
    }

    void AudioDecoderOgg::close()
    {
        if (isOpened())
        {
            ov_clear(&_vf);
            _isOpened = false;
        }
    }

    uint32_t AudioDecoderOgg::read(uint32_t framesToRead, char* pcmBuf)
    {
        int currentSection = 0;
        int bytesToRead = framesToRead * _bytesPerFrame;
        long bytesRead = ov_read(&_vf, pcmBuf, bytesToRead, 0, 2, 1, &currentSection);
        return static_cast<uint32_t>(bytesRead / _bytesPerFrame);
    }

    bool AudioDecoderOgg::seek(uint32_t frameOffset)
    {
        return 0 == ov_pcm_seek(&_vf, frameOffset);
    }

    uint32_t AudioDecoderOgg::tell() const
    {
        return static_cast<uint32_t>(ov_pcm_tell(const_cast<OggVorbis_File*>(&_vf)));
    }

}} // namespace cocos2d { namespace experimental {