FloatSampleBuffer.java 文件源码

/**
 * Write the contents of the byte array to this buffer, overwriting existing
 * data. If the byte array has fewer channels than this float buffer, only
 * the first channels are written. Vice versa, if the byte buffer has more
 * channels than this float buffer, only the first channels of the byte
 * buffer are written to this buffer.
 * <p>
 * The format and the number of samples of this float buffer are not
 * changed, so if the byte array has more samples than fit into this float
 * buffer, it is not expanded.
 * 
 * @param buffer the byte buffer to write to this float buffer
 * @param srcByteOffset the offset in bytes in buffer where to start reading
 * @param format the audio format of the bytes in buffer
 * @param dstSampleOffset the offset in samples where to start writing the
 *            converted float data into this float buffer
 * @param aSampleCount the number of samples to write
 * @return the number of samples actually written
 */
public int writeByteBuffer(byte[] buffer, int srcByteOffset,
        AudioFormat format, int dstSampleOffset, int aSampleCount) {
    if (dstSampleOffset + aSampleCount > getSampleCount()) {
        aSampleCount = getSampleCount() - dstSampleOffset;
    }
    int lChannels = format.getChannels();
    if (lChannels > getChannelCount()) {
        lChannels = getChannelCount();
    }
    if (lChannels > format.getChannels()) {
        lChannels = format.getChannels();
    }
    for (int channel = 0; channel < lChannels; channel++) {
        float[] data = getChannel(channel);

        FloatSampleTools.byte2floatGeneric(buffer, srcByteOffset,
                format.getFrameSize(), data, dstSampleOffset, aSampleCount,
                format);
        srcByteOffset += format.getFrameSize() / format.getChannels();
    }
    return aSampleCount;
}