android hdmi 播放

Question

背景：制作一个android电视的app，需要实现在app内播放HDMI视频源。
目前使用 TvView 可以播放HDMI源的画面，但没有声音该怎么办？代码如下：

补充：
audioManager.setParameters("audio_devices_out_active=AUDIO_HDMI");
按照上面这个思路找了网上的这个方法，但只成功了第一次，后面又再没声音了。
以下为目前代码

package com.example.hsy;

import static android.content.ContentValues.TAG;

import androidx.annotation.RequiresApi;
import androidx.appcompat.app.AppCompatActivity;

import android.content.Context;
import android.media.AudioAttributes;
import android.media.AudioFocusRequest;
import android.media.AudioManager;
import android.media.tv.TvContract;
import android.media.tv.TvInputInfo;
import android.media.tv.TvInputManager;
import android.media.tv.TvView;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.util.Log;

public class Tv extends AppCompatActivity {
    private TvView tvView;
    private AudioManager audioManager;
    private AudioFocusRequest audioFocusRequest;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_tv);
        tvView = (TvView)findViewById(R.id.tvView);
        audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            AudioAttributes audioAttributes = new AudioAttributes.Builder().setUsage(AudioAttributes.USAGE_MEDIA).setContentType(AudioAttributes.CONTENT_TYPE_MOVIE).build();
            audioFocusRequest = new AudioFocusRequest.Builder(AudioManager.AUDIOFOCUS_GAIN_TRANSIENT_MAY_DUCK).setAudioAttributes(audioAttributes).setAcceptsDelayedFocusGain(true).setOnAudioFocusChangeListener(new AudioManager.OnAudioFocusChangeListener() {
                @Override
                public void onAudioFocusChange(int focusChange) {
                    // Handle audio focus changes if needed
                }
            }).build();
        }

        tvView.setCallback(new TvView.TvInputCallback() {
            @Override
            public void onVideoAvailable(String inputId) {
                super.onVideoAvailable(inputId);
                // Request audio focus
                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                    audioManager.requestAudioFocus(audioFocusRequest);
                } else {
                    audioManager.requestAudioFocus(null, AudioManager.STREAM_MUSIC, AudioManager.AUDIOFOCUS_GAIN);
                }
            }

            @Override
            public void onVideoUnavailable(String inputId, int reason) {
                super.onVideoUnavailable(inputId, reason);
                // Abandon audio focus
                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                    audioManager.abandonAudioFocusRequest(audioFocusRequest);
                } else {
                    audioManager.abandonAudioFocus(null);
                }
            }
        });



        tvView.setStreamVolume(1.0f);
//        initData();
        playHdmi("com.mediatek.tvinput/.hdmi.HDMIInputService/HW5");


    }
    /**
     * 获取当前设备的输入源列表
     */
    private void initData() {
        TvInputManager tvInputManager = (TvInputManager) getSystemService(Context.TV_INPUT_SERVICE);
        if (tvInputManager == null) {
            return;
        }

        for (TvInputInfo info : tvInputManager.getTvInputList()) {
            Log.i(TAG, "id 信号源 :" + info.getId());
        }
    }

    /**
     * Build a special channel URI intended to be used with pass-through inputs. (e.g. HDMI)
     *
     * @param inputId The ID of the pass-through input to build a channels URI for.
     * @see TvInputInfo#isPassthroughInput()
     */
    public static Uri buildChannelUriForPassthroughInput(String inputId) {
        return TvContract.buildChannelUriForPassthroughInput(inputId);
    }

    @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
    private void playHdmi(String inputId) {
        tvView.reset();
        // Build a special channel URI intended to be used with pass-through inputs. (e.g. HDMI)
        Uri uri = buildChannelUriForPassthroughInput(inputId);
        tvView.tune(inputId, uri,null);

// 设置音频流类型为HDMI音频输出
        audioManager.setParameters("audio_devices_out_active=AUDIO_HDMI");
    }
    @Override
    protected void onDestroy() {
        super.onDestroy();
        // Abandon audio focus when the activity is destroyed
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            audioManager.abandonAudioFocusRequest(audioFocusRequest);
        } else {
            audioManager.abandonAudioFocus(null);
        }
    }

}

Answer 1

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---

要在Android应用中播放HDMI源的声音，您可以尝试使用AudioManager类来控制音量。请修改您的代码如下：

tvView = (TvView)findViewById(R.id.tvView);
tvView.setStreamVolume(1.0f);
initData();
playHdmi("com.mediatek.tvinput/.hdmi.HDMIInputService/HW5");

@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
private void playHdmi(string inputId) {
tvView.reset();
// Build a special channel URI intended to be used with pass-through inputs. (e.g. HDMI)
Uri uri = buildChannelUriForPassthroughInput(inputId);
tvView.tune(inputId, uri. params: null) ;

// 获取系统的AudioManager实例
AudioManager audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
// 设置音频流类型为HDMI音频输出
audioManager.setMode(AudioManager.MODE_IN_COMMUNICATION);
audioManager.setSpeakerphoneOn(false);
audioManager.setStreamVolume(AudioManager.STREAM_MUSIC, 1.0f, 0);
}