mirror of https://github.com/Genymobile/scrcpy
Capture device audio
Create an AudioRecorder to capture the audio source REMOTE_SUBMIX. For now, the captured packets are just logged into the console. PR #3757 <https://github.com/Genymobile/scrcpy/pull/3757> Co-authored-by: Romain Vimont <rom@rom1v.com> Signed-off-by: Romain Vimont <rom@rom1v.com>pull/3757/head
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package com.genymobile.scrcpy;
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import android.annotation.SuppressLint;
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import android.annotation.TargetApi;
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import android.media.AudioFormat;
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import android.media.AudioRecord;
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import android.media.MediaRecorder;
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import android.os.Build;
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public final class AudioEncoder {
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private static final int SAMPLE_RATE = 48000;
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private static final int CHANNEL_CONFIG = AudioFormat.CHANNEL_IN_STEREO;
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private static final int CHANNELS = 2;
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private static final int FORMAT = AudioFormat.ENCODING_PCM_16BIT;
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private static final int BYTES_PER_SAMPLE = 2;
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private static final int READ_MS = 5; // milliseconds
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private static final int READ_SIZE = SAMPLE_RATE * CHANNELS * BYTES_PER_SAMPLE * READ_MS / 1000;
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private Thread thread;
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private static AudioFormat createAudioFormat() {
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AudioFormat.Builder builder = new AudioFormat.Builder();
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builder.setEncoding(FORMAT);
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builder.setSampleRate(SAMPLE_RATE);
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builder.setChannelMask(CHANNEL_CONFIG);
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return builder.build();
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}
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@TargetApi(Build.VERSION_CODES.M)
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@SuppressLint({"WrongConstant", "MissingPermission"})
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private static AudioRecord createAudioRecord() {
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AudioRecord.Builder builder = new AudioRecord.Builder();
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if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {
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// On older APIs, Workarounds.fillAppInfo() must be called beforehand
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builder.setContext(FakeContext.get());
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}
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builder.setAudioSource(MediaRecorder.AudioSource.REMOTE_SUBMIX);
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builder.setAudioFormat(createAudioFormat());
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int minBufferSize = AudioRecord.getMinBufferSize(SAMPLE_RATE, CHANNEL_CONFIG, FORMAT);
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// This buffer size does not impact latency
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builder.setBufferSizeInBytes(8 * minBufferSize);
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return builder.build();
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}
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public void start() {
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AudioRecord recorder = createAudioRecord();
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thread = new Thread(() -> {
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recorder.startRecording();
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try {
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byte[] buf = new byte[READ_SIZE];
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while (!Thread.currentThread().isInterrupted()) {
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int r = recorder.read(buf, 0, READ_SIZE);
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if (r > 0) {
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Ln.i("Audio captured: " + r + " bytes");
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} else {
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Ln.e("Audio capture error: " + r);
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}
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}
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} finally {
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recorder.stop();
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}
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});
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thread.start();
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}
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public void stop() {
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if (thread != null) {
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thread.interrupt();
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}
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}
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public void join() throws InterruptedException {
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if (thread != null) {
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thread.join();
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}
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}
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}
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