AudioFrame

原始音频数据。

Java

public class AudioFrame {
  public ByteBuffer buffer;
  public int sampleRataHz;
  public int bytesPerSample;
  public int channelNums;
  public int samplesPerChannel;
  public long timestamp;
  @CalledByNative
  public AudioFrame(ByteBuffer buffer, int sampleRataHz, int bytesPerSample, int channelNums,
      int samplesPerChannel, long timestamp) {
    this.sampleRataHz = sampleRataHz;
    this.bytesPerSample = bytesPerSample;
    this.channelNums = channelNums;
    this.samplesPerChannel = samplesPerChannel;
    this.timestamp = timestamp;
    this.buffer = buffer;
  }
  @CalledByNative
  public ByteBuffer getByteBuffer() {
    return buffer;
  }
  @CalledByNative
  public int getBytesPerSample() {
    return bytesPerSample;
  }
  @CalledByNative
  public int getChannelNums() {
    return channelNums;
  }
  @CalledByNative
  public int getSampleRataHz() {
    return sampleRataHz;
  }
  @CalledByNative
  public int getSamplesPerChannel() {
    return samplesPerChannel;
  }
  @CalledByNative
  public long getTimestamp() {
    return timestamp;
  }
  @Override
  public String toString() {
    return "AudioFrame{sampleRataHz=" + sampleRataHz + ", bytesPerSample=" + bytesPerSample
        + ", channelNums=" + channelNums + ", samplesPerChannel=" + samplesPerChannel
        + ", timestamp=" + timestamp + '}';
  }
}

samplesPerChannel

每个声道的采样点数。

bytesPerSample

每个采样点的字节数。对于 PCM 来说，一般使用 16 bit，即两个字节。

channelNums

声道数量(如果是立体声，数据是交叉的)。

• 1: 单声道
• 2: 双声道

sampleRataHz

每声道每秒的采样点数。

buffer

声音数据缓存区（如果是立体声，数据是交叉存储的）。

缓存区数据大小 buffer = samples × channels × bytesPerSample。

timestamp

音频帧的时间戳。