Android13 AudioTrack getMinBufferSize流程分析

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已于 2024-05-30 08:29:14 修改 · 589 阅读

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#android

于 2024-05-07 09:11:32 首次发布

AudioTrack的getMinBufferSize方法：

//frameworks/base/media/java/android/media/AudioTrack.java
public class AudioTrack extends PlayerBase implements AudioRouting, VolumeAutomation
{
    static public int getMinBufferSize(int sampleRateInHz, int channelConfig, int audioFormat) {
        int channelCount = 0;
        switch(channelConfig) {
        case AudioFormat.CHANNEL_OUT_MONO:
        case AudioFormat.CHANNEL_CONFIGURATION_MONO:
            channelCount = 1;
            break;
        case AudioFormat.CHANNEL_OUT_STEREO:
        case AudioFormat.CHANNEL_CONFIGURATION_STEREO:
            channelCount = 2;
            break;
        default:
            if (!isMultichannelConfigSupported(channelConfig, audioFormat)) {
                loge("getMinBufferSize(): Invalid channel configuration.");
                return ERROR_BAD_VALUE;
            } else {
                channelCount = AudioFormat.channelCountFromOutChannelMask(channelConfig);