如何在android下使用superpowered SDK将文件写到外部存储？

Question

当执行一个项目使用超强的Android音频效果，如flunge，回声，混响等，我能够通过本机录制和写入文件在外部存储，然后使用超强的交叉推子示例我打开该文件，并在它上应用效果很好。

现在我需要将输出文件写入外部存储器，并应用特效，但不知道如何做到这一点。有像SuperpoweredOfflineProcessingExample这样的iOS例子，但我没有找到它对安卓文件的解决方案。任何帮助将高度赞赏，使音频输出wav文件的效果。

Answer 1

我有一个应用效果的要求，只是录制的音频(所以我有原始的wav和应用效果)。以下是将效果应用于原始文件并将其保存到单独文件方法的截图：

applyEffect(const char *input, const char *output, int effectId) {

SuperpoweredDecoder *decoder = new SuperpoweredDecoder();

const char *openError = decoder->open(input, false);
if (openError) {
    delete decoder;
    return false;
};

FILE *fd = createWAV(output, decoder->samplerate, 2);
if (!fd) {
    delete decoder;
    return false;
};

float effectMix = 0.5f;
SuperpoweredFX *effect = NULL;
if (effectId == 0) {
    effect = new SuperpoweredEcho(decoder->samplerate);
    ((SuperpoweredEcho *) effect)->setMix(effectMix);
} else if (effectId == 1) {
    effect = new SuperpoweredReverb(decoder->samplerate);
    ((SuperpoweredReverb *) effect)->setMix(effectMix);
}

if (effect == NULL) {
    delete decoder;
    return false;
}

effect->enable(true);

// Create a buffer for the 16-bit integer samples coming from the decoder.
short int *intBuffer = (short int *)malloc(decoder->samplesPerFrame * 2 * sizeof(short int) + 16384);
// Create a buffer for the 32-bit floating point samples required by the effect.
float *floatBuffer = (float *)malloc(decoder->samplesPerFrame * 2 * sizeof(float) + 1024);

// Processing.
while (true) {
    // Decode one frame. samplesDecoded will be overwritten with the actual decoded number of samples.
    unsigned int samplesDecoded = decoder->samplesPerFrame;
    if (decoder->decode(intBuffer, &samplesDecoded) == SUPERPOWEREDDECODER_ERROR) {
        break;
    }
    if (samplesDecoded < 1) {
        break;
    }

    // Apply the effect.

    // Convert the decoded PCM samples from 16-bit integer to 32-bit floating point.
    SuperpoweredShortIntToFloat(intBuffer, floatBuffer, samplesDecoded);

    effect->process(floatBuffer, floatBuffer, samplesDecoded);

    // Convert the PCM samples from 32-bit floating point to 16-bit integer.
    SuperpoweredFloatToShortInt(floatBuffer, intBuffer, samplesDecoded);
    }

    // Write the audio to disk.
    fwrite(intBuffer, 1, samplesDecoded * 4, fd);

};

// Cleanup.
closeWAV(fd);
delete decoder;
delete effect;
free(intBuffer);
free(floatBuffer);
return true;

}

将创建具有应用效果的新文件。希望它能以某种方式帮助你！