以 wav 格式录制时,如何在 Android 上将 AudioRecord 对象中的每个样本的位数从 16 位更改为 8 位(或其他比特率)?
这不起作用(例如在这里讨论:Using AudioRecord with 8-bit encoding in android):
private static int RECORDER_AUDIO_ENCODING =
AudioFormat.ENCODING_PCM_8BIT; -->ERROR: Invalid Audio Format.
bufferSize = AudioRecord.getMinBufferSize(RECORDER_SAMPLERATE,RECORDER_CHANNELS,
RECORDER_AUDIO_ENCODING);
recorder = new AudioRecord(MediaRecorder.AudioSource.MIC,RECORDER_SAMPLERATE,
RECORDER_CHANNELS,RECORDER_AUDIO_ENCODING, bufferSize);
带有标题:
private void WriteWaveFileHeader(
FileOutputStream out, long totalAudioLen,
long totalDataLen, long longSampleRate, int channels,
long byteRate) throws IOException {
byte[] header = new byte[44];
header[0] = 'R'; // RIFF/WAVE header
...header content...
header[32] = (byte) (2 * 16 / 8); // block align
header[33] = 0;
header[34] = (byte)RECORDER_BPP; // bits per sample, set to 8
...header content...
out.write(header, 0, 44);
}