axmol/cocos/audio/android/AudioDecoderMp3.cpp

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Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.

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#define LOG_TAG "AudioDecoderMp3"

#include "audio/android/AudioDecoderMp3.h"
#include "audio/android/mp3reader.h"
#include "platform/CCFileUtils.h"

namespace cocos2d { namespace experimental {

AudioDecoderMp3::AudioDecoderMp3()
{
    ALOGV("Create AudioDecoderMp3");
}

AudioDecoderMp3::~AudioDecoderMp3()
{

}

bool AudioDecoderMp3::decodeToPcm()
{
    _fileData = FileUtils::getInstance()->getDataFromFile(_url);
    if (_fileData.isNull())
    {
        return false;
    }

    mp3_callbacks callbacks;
    callbacks.read = AudioDecoder::fileRead;
    callbacks.seek = AudioDecoder::fileSeek;
    callbacks.close = AudioDecoder::fileClose;
    callbacks.tell = AudioDecoder::fileTell;

    int numChannels = 0;
    int sampleRate = 0;
    int numFrames = 0;
    
    if (EXIT_SUCCESS == decodeMP3(&callbacks, this, *_result.pcmBuffer, &numChannels, &sampleRate, &numFrames)
        && numChannels > 0 && sampleRate > 0 && numFrames > 0)
    {
        _result.numChannels = numChannels;
        _result.sampleRate = sampleRate;
        _result.bitsPerSample = SL_PCMSAMPLEFORMAT_FIXED_16;
        _result.containerSize = SL_PCMSAMPLEFORMAT_FIXED_16;
        _result.channelMask = numChannels == 1 ? SL_SPEAKER_FRONT_CENTER : (SL_SPEAKER_FRONT_LEFT | SL_SPEAKER_FRONT_RIGHT);
        _result.endianness = SL_BYTEORDER_LITTLEENDIAN;
        _result.numFrames = numFrames;
        _result.duration = 1.0f * numFrames / sampleRate;

        std::string info = _result.toString();
        ALOGI("Original audio info: %s, total size: %d", info.c_str(), (int)_result.pcmBuffer->size());
        return true;
    }

    ALOGE("Decode MP3 (%s) failed, channels: %d, rate: %d, frames: %d", _url.c_str(), numChannels, sampleRate, numFrames);
    return false;
}

}} // namespace cocos2d { namespace experimental {