RedCore/cocos2d/cocos/audio/android/AudioDecoderWav.cpp

/****************************************************************************
Copyright (c) 2017 Chukong Technologies Inc.

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#define LOG_TAG "AudioDecoderWav"

#include "audio/android/AudioDecoderWav.h"
#include "audio/android/tinysndfile.h"
#include "platform/CCFileUtils.h"

namespace cocos2d { namespace experimental {

AudioDecoderWav::AudioDecoderWav()
{
    ALOGV("Create AudioDecoderWav");
}

AudioDecoderWav::~AudioDecoderWav()
{

}

void* AudioDecoderWav::onWavOpen(const char* path, void* user)
{
    return user;
}

int AudioDecoderWav::onWavSeek(void* datasource, long offset, int whence)
{
    return AudioDecoder::fileSeek(datasource, (int64_t) offset, whence);
}

int AudioDecoderWav::onWavClose(void* datasource)
{
}

bool AudioDecoderWav::decodeToPcm()
{
    _fileData = FileUtils::getInstance()->getDataFromFile(_url);
    if (_fileData.isNull())
    {
        return false;
    }

    SF_INFO info;

    snd_callbacks cb;
    cb.open = onWavOpen;
    cb.read = AudioDecoder::fileRead;
    cb.seek = onWavSeek;
    cb.close = onWavClose;
    cb.tell = AudioDecoder::fileTell;

    SNDFILE* handle = NULL;
    bool ret = false;
    do
    {
        handle = sf_open_read(_url.c_str(), &info, &cb, this);
        if (handle == nullptr)
            break;

        if (info.frames == 0)
            break;

        ALOGD("wav info: frames: %d, samplerate: %d, channels: %d, format: %d", info.frames, info.samplerate, info.channels, info.format);
        size_t bufSize = sizeof(short) * info.frames * info.channels;
        unsigned char* buf = (unsigned char*)malloc(bufSize);
        sf_count_t readFrames = sf_readf_short(handle, (short*)buf, info.frames);
        assert(readFrames == info.frames);

        _result.pcmBuffer->insert(_result.pcmBuffer->end(), buf, buf + bufSize);
        _result.numChannels = info.channels;
        _result.sampleRate = info.samplerate;
        _result.bitsPerSample = SL_PCMSAMPLEFORMAT_FIXED_16;
        _result.containerSize = SL_PCMSAMPLEFORMAT_FIXED_16;
        _result.channelMask = _result.numChannels == 1 ? SL_SPEAKER_FRONT_CENTER : (SL_SPEAKER_FRONT_LEFT | SL_SPEAKER_FRONT_RIGHT);
        _result.endianness = SL_BYTEORDER_LITTLEENDIAN;
        _result.numFrames = info.frames;
        _result.duration = 1.0f * info.frames / _result.sampleRate;

        free(buf);
        ret = true;
    } while (false);

    if (handle != NULL)
        sf_close(handle);

    return ret;
}

}} // namespace cocos2d { namespace experimental {