mirror of
https://github.com/encounter/SDL.git
synced 2025-12-08 21:17:45 +00:00
Added support for surround sound and float audio on Android
This commit is contained in:
Sam Lantinga
@@ -1,6 +1,7 @@
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package org.libsdl.app;
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import android.media.*;
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import android.os.Build;
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import android.util.Log;
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public class SDLAudioManager
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@@ -17,41 +18,250 @@ public class SDLAudioManager
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// Audio
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/**
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* This method is called by SDL using JNI.
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*/
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public static int audioOpen(int sampleRate, boolean is16Bit, boolean isStereo, int desiredFrames) {
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int channelConfig = isStereo ? AudioFormat.CHANNEL_CONFIGURATION_STEREO : AudioFormat.CHANNEL_CONFIGURATION_MONO;
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int audioFormat = is16Bit ? AudioFormat.ENCODING_PCM_16BIT : AudioFormat.ENCODING_PCM_8BIT;
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int frameSize = (isStereo ? 2 : 1) * (is16Bit ? 2 : 1);
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protected static String getAudioFormatString(int audioFormat) {
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switch (audioFormat) {
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case AudioFormat.ENCODING_PCM_8BIT:
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return "8-bit";
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case AudioFormat.ENCODING_PCM_16BIT:
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return "16-bit";
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case AudioFormat.ENCODING_PCM_FLOAT:
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return "float";
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default:
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return Integer.toString(audioFormat);
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}
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}
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Log.v(TAG, "SDL audio: wanted " + (isStereo ? "stereo" : "mono") + " " + (is16Bit ? "16-bit" : "8-bit") + " " + (sampleRate / 1000f) + "kHz, " + desiredFrames + " frames buffer");
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protected static int[] open(boolean isCapture, int sampleRate, int audioFormat, int desiredChannels, int desiredFrames) {
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int channelConfig;
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int sampleSize;
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int frameSize;
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Log.v(TAG, "Opening " + (isCapture ? "capture" : "playback") + ", requested " + desiredFrames + " frames of " + desiredChannels + " channel " + getAudioFormatString(audioFormat) + " audio at " + sampleRate + " Hz");
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/* On older devices let's use known good settings */
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if (Build.VERSION.SDK_INT < 21) {
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if (desiredChannels > 2) {
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desiredChannels = 2;
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}
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if (sampleRate < 8000) {
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sampleRate = 8000;
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} else if (sampleRate > 48000) {
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sampleRate = 48000;
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}
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}
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if (audioFormat == AudioFormat.ENCODING_PCM_FLOAT) {
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int minSDKVersion = (isCapture ? 23 : 21);
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if (Build.VERSION.SDK_INT < minSDKVersion) {
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audioFormat = AudioFormat.ENCODING_PCM_16BIT;
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}
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}
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switch (audioFormat)
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{
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case AudioFormat.ENCODING_PCM_8BIT:
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sampleSize = 1;
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break;
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case AudioFormat.ENCODING_PCM_16BIT:
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sampleSize = 2;
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break;
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case AudioFormat.ENCODING_PCM_FLOAT:
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sampleSize = 4;
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break;
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default:
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Log.v(TAG, "Requested format " + audioFormat + ", getting ENCODING_PCM_16BIT");
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audioFormat = AudioFormat.ENCODING_PCM_16BIT;
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sampleSize = 2;
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break;
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}
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if (isCapture) {
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switch (desiredChannels) {
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case 1:
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channelConfig = AudioFormat.CHANNEL_IN_MONO;
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break;
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case 2:
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channelConfig = AudioFormat.CHANNEL_IN_STEREO;
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break;
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default:
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Log.v(TAG, "Requested " + desiredChannels + " channels, getting stereo");
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desiredChannels = 2;
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channelConfig = AudioFormat.CHANNEL_IN_STEREO;
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break;
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}
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} else {
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switch (desiredChannels) {
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case 1:
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channelConfig = AudioFormat.CHANNEL_OUT_MONO;
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break;
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case 2:
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channelConfig = AudioFormat.CHANNEL_OUT_STEREO;
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break;
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case 3:
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channelConfig = AudioFormat.CHANNEL_OUT_STEREO | AudioFormat.CHANNEL_OUT_FRONT_CENTER;
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break;
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case 4:
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channelConfig = AudioFormat.CHANNEL_OUT_QUAD;
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break;
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case 5:
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channelConfig = AudioFormat.CHANNEL_OUT_QUAD | AudioFormat.CHANNEL_OUT_FRONT_CENTER;
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break;
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case 6:
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channelConfig = AudioFormat.CHANNEL_OUT_5POINT1;
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break;
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case 7:
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channelConfig = AudioFormat.CHANNEL_OUT_5POINT1 | AudioFormat.CHANNEL_OUT_BACK_CENTER;
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break;
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case 8:
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if (Build.VERSION.SDK_INT >= 23) {
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channelConfig = AudioFormat.CHANNEL_OUT_7POINT1_SURROUND;
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} else {
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Log.v(TAG, "Requested " + desiredChannels + " channels, getting 5.1 surround");
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desiredChannels = 6;
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channelConfig = AudioFormat.CHANNEL_OUT_5POINT1;
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}
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break;
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default:
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Log.v(TAG, "Requested " + desiredChannels + " channels, getting stereo");
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desiredChannels = 2;
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channelConfig = AudioFormat.CHANNEL_OUT_STEREO;
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break;
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}
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/*
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Log.v(TAG, "Speaker configuration (and order of channels):");
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if ((channelConfig & 0x00000004) != 0) {
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Log.v(TAG, " CHANNEL_OUT_FRONT_LEFT");
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}
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if ((channelConfig & 0x00000008) != 0) {
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Log.v(TAG, " CHANNEL_OUT_FRONT_RIGHT");
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}
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if ((channelConfig & 0x00000010) != 0) {
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Log.v(TAG, " CHANNEL_OUT_FRONT_CENTER");
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}
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if ((channelConfig & 0x00000020) != 0) {
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Log.v(TAG, " CHANNEL_OUT_LOW_FREQUENCY");
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}
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if ((channelConfig & 0x00000040) != 0) {
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Log.v(TAG, " CHANNEL_OUT_BACK_LEFT");
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}
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if ((channelConfig & 0x00000080) != 0) {
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Log.v(TAG, " CHANNEL_OUT_BACK_RIGHT");
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}
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if ((channelConfig & 0x00000100) != 0) {
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Log.v(TAG, " CHANNEL_OUT_FRONT_LEFT_OF_CENTER");
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}
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if ((channelConfig & 0x00000200) != 0) {
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Log.v(TAG, " CHANNEL_OUT_FRONT_RIGHT_OF_CENTER");
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}
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if ((channelConfig & 0x00000400) != 0) {
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Log.v(TAG, " CHANNEL_OUT_BACK_CENTER");
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}
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if ((channelConfig & 0x00000800) != 0) {
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Log.v(TAG, " CHANNEL_OUT_SIDE_LEFT");
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}
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if ((channelConfig & 0x00001000) != 0) {
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Log.v(TAG, " CHANNEL_OUT_SIDE_RIGHT");
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}
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*/
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}
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frameSize = (sampleSize * desiredChannels);
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// Let the user pick a larger buffer if they really want -- but ye
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// gods they probably shouldn't, the minimums are horrifyingly high
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// latency already
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desiredFrames = Math.max(desiredFrames, (AudioTrack.getMinBufferSize(sampleRate, channelConfig, audioFormat) + frameSize - 1) / frameSize);
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int minBufferSize;
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if (isCapture) {
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minBufferSize = AudioRecord.getMinBufferSize(sampleRate, channelConfig, audioFormat);
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} else {
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minBufferSize = AudioTrack.getMinBufferSize(sampleRate, channelConfig, audioFormat);
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}
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desiredFrames = Math.max(desiredFrames, (minBufferSize + frameSize - 1) / frameSize);
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if (mAudioTrack == null) {
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mAudioTrack = new AudioTrack(AudioManager.STREAM_MUSIC, sampleRate,
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channelConfig, audioFormat, desiredFrames * frameSize, AudioTrack.MODE_STREAM);
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int[] results = new int[4];
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// Instantiating AudioTrack can "succeed" without an exception and the track may still be invalid
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// Ref: https://android.googlesource.com/platform/frameworks/base/+/refs/heads/master/media/java/android/media/AudioTrack.java
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// Ref: http://developer.android.com/reference/android/media/AudioTrack.html#getState()
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if (isCapture) {
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if (mAudioRecord == null) {
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mAudioRecord = new AudioRecord(MediaRecorder.AudioSource.DEFAULT, sampleRate,
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channelConfig, audioFormat, desiredFrames * frameSize);
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if (mAudioTrack.getState() != AudioTrack.STATE_INITIALIZED) {
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Log.e(TAG, "Failed during initialization of Audio Track");
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mAudioTrack = null;
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return -1;
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// see notes about AudioTrack state in audioOpen(), above. Probably also applies here.
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if (mAudioRecord.getState() != AudioRecord.STATE_INITIALIZED) {
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Log.e(TAG, "Failed during initialization of AudioRecord");
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mAudioRecord.release();
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mAudioRecord = null;
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return null;
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}
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mAudioRecord.startRecording();
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}
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mAudioTrack.play();
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results[0] = mAudioRecord.getSampleRate();
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results[1] = mAudioRecord.getAudioFormat();
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results[2] = mAudioRecord.getChannelCount();
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results[3] = desiredFrames;
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} else {
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if (mAudioTrack == null) {
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mAudioTrack = new AudioTrack(AudioManager.STREAM_MUSIC, sampleRate, channelConfig, audioFormat, desiredFrames * frameSize, AudioTrack.MODE_STREAM);
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// Instantiating AudioTrack can "succeed" without an exception and the track may still be invalid
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// Ref: https://android.googlesource.com/platform/frameworks/base/+/refs/heads/master/media/java/android/media/AudioTrack.java
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// Ref: http://developer.android.com/reference/android/media/AudioTrack.html#getState()
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if (mAudioTrack.getState() != AudioTrack.STATE_INITIALIZED) {
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/* Try again, with safer values */
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Log.e(TAG, "Failed during initialization of Audio Track");
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mAudioTrack.release();
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mAudioTrack = null;
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return null;
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}
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mAudioTrack.play();
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}
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results[0] = mAudioTrack.getSampleRate();
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results[1] = mAudioTrack.getAudioFormat();
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results[2] = mAudioTrack.getChannelCount();
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results[3] = desiredFrames;
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}
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Log.v(TAG, "SDL audio: got " + ((mAudioTrack.getChannelCount() >= 2) ? "stereo" : "mono") + " " + ((mAudioTrack.getAudioFormat() == AudioFormat.ENCODING_PCM_16BIT) ? "16-bit" : "8-bit") + " " + (mAudioTrack.getSampleRate() / 1000f) + "kHz, " + desiredFrames + " frames buffer");
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Log.v(TAG, "Opening " + (isCapture ? "capture" : "playback") + ", got " + results[3] + " frames of " + results[2] + " channel " + getAudioFormatString(results[1]) + " audio at " + results[0] + " Hz");
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return 0;
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return results;
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}
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/**
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* This method is called by SDL using JNI.
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*/
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public static int[] audioOpen(int sampleRate, int audioFormat, int desiredChannels, int desiredFrames) {
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return open(false, sampleRate, audioFormat, desiredChannels, desiredFrames);
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}
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/**
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* This method is called by SDL using JNI.
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*/
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public static void audioWriteFloatBuffer(float[] buffer) {
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if (mAudioTrack == null) {
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Log.e(TAG, "Attempted to make audio call with uninitialized audio!");
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return;
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}
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for (int i = 0; i < buffer.length;) {
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int result = mAudioTrack.write(buffer, i, buffer.length - i, AudioTrack.WRITE_BLOCKING);
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if (result > 0) {
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i += result;
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} else if (result == 0) {
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try {
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Thread.sleep(1);
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} catch(InterruptedException e) {
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// Nom nom
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}
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} else {
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Log.w(TAG, "SDL audio: error return from write(float)");
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return;
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}
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}
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}
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/**
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@@ -63,7 +273,7 @@ public class SDLAudioManager
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return;
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}
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for (int i = 0; i < buffer.length; ) {
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for (int i = 0; i < buffer.length;) {
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int result = mAudioTrack.write(buffer, i, buffer.length - i);
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if (result > 0) {
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i += result;
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@@ -109,53 +319,33 @@ public class SDLAudioManager
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/**
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* This method is called by SDL using JNI.
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*/
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public static int captureOpen(int sampleRate, boolean is16Bit, boolean isStereo, int desiredFrames) {
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int channelConfig = isStereo ? AudioFormat.CHANNEL_CONFIGURATION_STEREO : AudioFormat.CHANNEL_CONFIGURATION_MONO;
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int audioFormat = is16Bit ? AudioFormat.ENCODING_PCM_16BIT : AudioFormat.ENCODING_PCM_8BIT;
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int frameSize = (isStereo ? 2 : 1) * (is16Bit ? 2 : 1);
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public static int[] captureOpen(int sampleRate, int audioFormat, int desiredChannels, int desiredFrames) {
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return open(true, sampleRate, audioFormat, desiredChannels, desiredFrames);
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}
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Log.v(TAG, "SDL capture: wanted " + (isStereo ? "stereo" : "mono") + " " + (is16Bit ? "16-bit" : "8-bit") + " " + (sampleRate / 1000f) + "kHz, " + desiredFrames + " frames buffer");
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// Let the user pick a larger buffer if they really want -- but ye
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// gods they probably shouldn't, the minimums are horrifyingly high
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// latency already
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desiredFrames = Math.max(desiredFrames, (AudioRecord.getMinBufferSize(sampleRate, channelConfig, audioFormat) + frameSize - 1) / frameSize);
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if (mAudioRecord == null) {
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mAudioRecord = new AudioRecord(MediaRecorder.AudioSource.DEFAULT, sampleRate,
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channelConfig, audioFormat, desiredFrames * frameSize);
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// see notes about AudioTrack state in audioOpen(), above. Probably also applies here.
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if (mAudioRecord.getState() != AudioRecord.STATE_INITIALIZED) {
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Log.e(TAG, "Failed during initialization of AudioRecord");
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mAudioRecord.release();
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mAudioRecord = null;
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return -1;
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}
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mAudioRecord.startRecording();
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}
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Log.v(TAG, "SDL capture: got " + ((mAudioRecord.getChannelCount() >= 2) ? "stereo" : "mono") + " " + ((mAudioRecord.getAudioFormat() == AudioFormat.ENCODING_PCM_16BIT) ? "16-bit" : "8-bit") + " " + (mAudioRecord.getSampleRate() / 1000f) + "kHz, " + desiredFrames + " frames buffer");
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return 0;
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/** This method is called by SDL using JNI. */
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public static int captureReadFloatBuffer(float[] buffer, boolean blocking) {
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return mAudioRecord.read(buffer, 0, buffer.length, blocking ? AudioRecord.READ_BLOCKING : AudioRecord.READ_NON_BLOCKING);
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}
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/** This method is called by SDL using JNI. */
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public static int captureReadShortBuffer(short[] buffer, boolean blocking) {
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// !!! FIXME: this is available in API Level 23. Until then, we always block. :(
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//return mAudioRecord.read(buffer, 0, buffer.length, blocking ? AudioRecord.READ_BLOCKING : AudioRecord.READ_NON_BLOCKING);
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return mAudioRecord.read(buffer, 0, buffer.length);
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if (Build.VERSION.SDK_INT < 23) {
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return mAudioRecord.read(buffer, 0, buffer.length);
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} else {
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return mAudioRecord.read(buffer, 0, buffer.length, blocking ? AudioRecord.READ_BLOCKING : AudioRecord.READ_NON_BLOCKING);
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}
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}
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/** This method is called by SDL using JNI. */
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public static int captureReadByteBuffer(byte[] buffer, boolean blocking) {
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// !!! FIXME: this is available in API Level 23. Until then, we always block. :(
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//return mAudioRecord.read(buffer, 0, buffer.length, blocking ? AudioRecord.READ_BLOCKING : AudioRecord.READ_NON_BLOCKING);
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return mAudioRecord.read(buffer, 0, buffer.length);
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if (Build.VERSION.SDK_INT < 23) {
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return mAudioRecord.read(buffer, 0, buffer.length);
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} else {
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return mAudioRecord.read(buffer, 0, buffer.length, blocking ? AudioRecord.READ_BLOCKING : AudioRecord.READ_NON_BLOCKING);
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}
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}
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/** This method is called by SDL using JNI. */
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public static void audioClose() {
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if (mAudioTrack != null) {
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Block a user