Android录制通话参数

我正在开发一个DTMF解码器。我需要的是录制语音通话，然后提取频率范围。一切正常，但在一些android版本中，我在设置音频源时遇到以下错误

“音频属性的捕获预设3无效”

为了获得正确的参数，我开发了一种算法：

private static final int[] FREQUENCY = {8000, 11025, 16000, 22050, 44100}; // 44100 is guaranteed to work in all devices

private static final int[] CHANNEL_CONFIGURATION = {AudioFormat.CHANNEL_IN_MONO,
                                                    AudioFormat.CHANNEL_IN_STEREO};

private static final int[] AUDIO_ENCODING = {AudioFormat.ENCODING_DEFAULT,
                                             AudioFormat.ENCODING_PCM_8BIT,
                                             AudioFormat.ENCODING_PCM_16BIT};

for (int i = 0; i < FREQUENCY.length && !found; i ++) {
        for (int j = 0; j < CHANNEL_CONFIGURATION.length && !found; j ++) {
            for (int k = 0; k < AUDIO_ENCODING.length && !found; k ++) {
                try {
                    bufferSize = AudioRecord.getMinBufferSize(FREQUENCY[i], CHANNEL_CONFIGURATION[j], AUDIO_ENCODING[k]);
                    if (bufferSize != AudioRecord.ERROR_BAD_VALUE && bufferSize != AudioRecord.ERROR) {
                        audioRecord = new AudioRecord(MediaRecorder.AudioSource.VOICE_DOWNLINK, FREQUENCY[i], CHANNEL_CONFIGURATION[j], AUDIO_ENCODING[k], bufferSize);
                        found = true;
                    }
                } catch (Exception e) {
                    Log.e(TAG, e.toString());
                }
            }
        }
    }

private static final int[]频率={8000、11025、16000、22050、44100}；//44100保证在所有设备中工作
私有静态最终int[]通道配置={AudioFormat.CHANNEL\u IN_MONO，
AudioFormat.CHANNEL_IN_STEREO}；
私有静态final int[]音频编码={AudioFormat.ENCODING_默认值，
AudioFormat.ENCODING_PCM8bit，
AudioFormat.ENCODING_PCM_16BIT}；
对于（int i=0；i

未找到api 19或22的正确参数，无法设置录音。在任何情况下都会引发异常。 我对这件事很感兴趣。我没有考虑使用MediaRecoder类，因为我不能直接从recoder读取缓冲区，这对dtmf解码过程至关重要。我也见过一些dtmf开源解码器，但它们都有这个问题 Android官方BUG

第一 它的构造器

公共录音（int audioSource，int sampleRateInHz，int channelConfig，int audioFormat，int bufferSizeInBytes）

可能不推荐使用（我认为），一个非法的argumentexception被直接抛出，另一个构造器方法如下（特别是公共API的候选构造器）：

第二 你可以试试

/**语音呼叫上行+下行音频源*/
公共静态最终int语音通话=4；

第三 参考资源

---

一些android版本禁用了此功能。如果你有android的源代码，你可以让它工作。我目前正在使用cyanogenmod，因此我定制了AudioAttributes.java类，以便在发生异常时不引发异常

我们只需在AudioAttributes.java中更改setCapturePreset（）方法，即在switch/case结构中添加所需的所有音频源

这是原件：

/**
     * @hide
     * Sets the capture preset.
     * Use this audio attributes configuration method when building an {@link AudioRecord}
     * instance with {@link AudioRecord#AudioRecord(AudioAttributes, AudioFormat, int)}.
     * @param preset one of {@link MediaRecorder.AudioSource#DEFAULT},
     *     {@link MediaRecorder.AudioSource#MIC}, {@link MediaRecorder.AudioSource#CAMCORDER},
     *     {@link MediaRecorder.AudioSource#VOICE_RECOGNITION} or
     *     {@link MediaRecorder.AudioSource#VOICE_COMMUNICATION}.
     * @return the same Builder instance.
     */
    @SystemApi
    public Builder setCapturePreset(int preset) {
        switch (preset) {
            case MediaRecorder.AudioSource.DEFAULT:
            case MediaRecorder.AudioSource.MIC:
            case MediaRecorder.AudioSource.CAMCORDER:
            case MediaRecorder.AudioSource.VOICE_RECOGNITION:
            case MediaRecorder.AudioSource.VOICE_COMMUNICATION:
                mSource = preset;
                break;
            default:
                Log.e(TAG, "Invalid capture preset " + preset + " for AudioAttributes");
        }
        return this;
    }

我用这个来代替：

/**
     * @hide
     * Sets the capture preset.
     * Use this audio attributes configuration method when building an {@link AudioRecord}
     * instance with {@link AudioRecord#AudioRecord(AudioAttributes, AudioFormat, int)}.
     * @param preset one of {@link MediaRecorder.AudioSource#DEFAULT},
     *     {@link MediaRecorder.AudioSource#MIC}, {@link MediaRecorder.AudioSource#CAMCORDER},
     *     {@link MediaRecorder.AudioSource#VOICE_RECOGNITION} or
     *     {@link MediaRecorder.AudioSource#VOICE_COMMUNICATION}.
     * @return the same Builder instance.
     */
    @SystemApi
    public Builder setCapturePreset(int preset) {
        switch (preset) {
            case MediaRecorder.AudioSource.DEFAULT:
            case MediaRecorder.AudioSource.MIC:
            case MediaRecorder.AudioSource.CAMCORDER:
            case MediaRecorder.AudioSource.VOICE_RECOGNITION:
            case MediaRecorder.AudioSource.VOICE_COMMUNICATION:
            case MediaRecorder.AudioSource.VOICE_DOWNLINK:
            case MediaRecorder.AudioSource.VOICE_UPLINK:
            case MediaRecorder.AudioSource.VOICE_CALL:
                mSource = preset;
                break;
            default:
                Log.e(TAG, "Invalid capture preset " + preset + " for AudioAttributes");
        }
        return this;
    }

---

嗨，谢谢你的回复。当我这样做时，我得到一个反射调用目标异常：Constructor cons=AudioRecord.class.getConstructor（AudioAttributes.class，AudioFormat.class，int.class，int.class）；audioRecord=（audioRecord）cons.newInstance（attrs.build（），format.build（），bufferSize，AudioManager.AUDIO_SESSION_ID_GENERATE）；--有什么想法吗？我用api 22编译

/**
     * @hide
     * Sets the capture preset.
     * Use this audio attributes configuration method when building an {@link AudioRecord}
     * instance with {@link AudioRecord#AudioRecord(AudioAttributes, AudioFormat, int)}.
     * @param preset one of {@link MediaRecorder.AudioSource#DEFAULT},
     *     {@link MediaRecorder.AudioSource#MIC}, {@link MediaRecorder.AudioSource#CAMCORDER},
     *     {@link MediaRecorder.AudioSource#VOICE_RECOGNITION} or
     *     {@link MediaRecorder.AudioSource#VOICE_COMMUNICATION}.
     * @return the same Builder instance.
     */
    @SystemApi
    public Builder setCapturePreset(int preset) {
        switch (preset) {
            case MediaRecorder.AudioSource.DEFAULT:
            case MediaRecorder.AudioSource.MIC:
            case MediaRecorder.AudioSource.CAMCORDER:
            case MediaRecorder.AudioSource.VOICE_RECOGNITION:
            case MediaRecorder.AudioSource.VOICE_COMMUNICATION:
                mSource = preset;
                break;
            default:
                Log.e(TAG, "Invalid capture preset " + preset + " for AudioAttributes");
        }
        return this;
    }

/**
     * @hide
     * Sets the capture preset.
     * Use this audio attributes configuration method when building an {@link AudioRecord}
     * instance with {@link AudioRecord#AudioRecord(AudioAttributes, AudioFormat, int)}.
     * @param preset one of {@link MediaRecorder.AudioSource#DEFAULT},
     *     {@link MediaRecorder.AudioSource#MIC}, {@link MediaRecorder.AudioSource#CAMCORDER},
     *     {@link MediaRecorder.AudioSource#VOICE_RECOGNITION} or
     *     {@link MediaRecorder.AudioSource#VOICE_COMMUNICATION}.
     * @return the same Builder instance.
     */
    @SystemApi
    public Builder setCapturePreset(int preset) {
        switch (preset) {
            case MediaRecorder.AudioSource.DEFAULT:
            case MediaRecorder.AudioSource.MIC:
            case MediaRecorder.AudioSource.CAMCORDER:
            case MediaRecorder.AudioSource.VOICE_RECOGNITION:
            case MediaRecorder.AudioSource.VOICE_COMMUNICATION:
            case MediaRecorder.AudioSource.VOICE_DOWNLINK:
            case MediaRecorder.AudioSource.VOICE_UPLINK:
            case MediaRecorder.AudioSource.VOICE_CALL:
                mSource = preset;
                break;
            default:
                Log.e(TAG, "Invalid capture preset " + preset + " for AudioAttributes");
        }
        return this;
    }