OpenHarmony OpenSl ES音频录制
1、OpenHarmony OpenSl ES音频录制开发简介
开发者可以通过本博文了解在OpenHarmony中如何使用OpenSL ES进行录音相关操作;当前仅实现了部分OpenSL ES接口,因此调用未实现接口后会返回。SL_RESULT_FEATURE_UNSUPPORTED。
2、OpenHarmony OpenSl ES音频录制开发指导
以下步骤描述了在OpenHarmony如何使用 OpenSL ES 开发音频录音功能:
(1).添加头文件
#include #include #include
(2).使用 slCreateEngine 接口创建引擎对象和实例化引擎对象 engine
SLObjectItf engineObject = nullptr;slCreateEngine(&engineObject, 0, nullptr, 0, nullptr, nullptr);(*engineObject)->Realize(engineObject, SL_BOOLEAN_FALSE);
(3).获取接口 SL_IID_ENGINE 的引擎接口 engineEngine 实例
SLEngineItf engineItf = nullptr;result = (*engineObject)->GetInterface(engineObject, SL_IID_ENGINE, &engineItf);
(4).配置录音器信息(配置输入源audiosource、输出源audiosink),创建录音对象pcmCapturerObject
SLDataLocator_IODevice io_device = { SL_DATALOCATOR_IODEVICE, SL_IODEVICE_AUDIOINPUT, SL_DEFAULTDEVICEID_AUDIOINPUT, NULL};SLDataSource audioSource = { &io_device, NULL};SLDataLocator_BufferQueue buffer_queue = { SL_DATALOCATOR_BUFFERQUEUE, 3};//具体参数需要根据音频文件格式进行适配SLDataFormat_PCM format_pcm = { SL_DATAFORMAT_PCM, OHOS::AudioStandard::AudioChannel::MONO, OHOS::AudioStandard::AudioSamplingRate::SAMPLE_RATE_44100, OHOS::AudioStandard::AudioSampleFormat::SAMPLE_S16LE, 0, 0, 0};SLDataSink audioSink = { &buffer_queue, &format_pcm};SLObjectItf pcmCapturerObject = nullptr;result = (*engineItf)->CreateAudioRecorder(engineItf, &pcmCapturerObject, &audioSource, &audioSink, 0, nullptr, nullptr);(*pcmCapturerObject)->Realize(pcmCapturerObject, SL_BOOLEAN_FALSE);
(5).获取录音接口SL_IID_RECORD 的 recordItf 接口实例
SLRecordItf recordItf;(*pcmCapturerObject)->GetInterface(pcmCapturerObject, SL_IID_RECORD, &recordItf);
(6).获取接口 SL_IID_OH_BUFFERQUEUE 的 bufferQueueItf 实例
SLOHBufferQueueItf bufferQueueItf;(*pcmCapturerObject)->GetInterface(pcmCapturerObject, SL_IID_OH_BUFFERQUEUE, &bufferQueueItf);
(7).注册 BufferQueueCallback 回调
static void BufferQueueCallback(SLOHBufferQueueItf bufferQueueItf, void *pContext, SLuint32 size){ AUDIO_INFO_LOG("BufferQueueCallback"); FILE *wavFile = (FILE *)pContext; if (wavFile != nullptr) { SLuint8 *buffer = nullptr; SLuint32 pSize = 0; (*bufferQueueItf)->GetBuffer(bufferQueueItf, &buffer, pSize); if (buffer != nullptr) { fwrite(buffer, 1, pSize, wavFile); (*bufferQueueItf)->Enqueue(bufferQueueItf, buffer, size); } } return;}//wavFile_ 需要设置为用户想要录音的文件描述符(*bufferQueueItf)->RegisterCallback(bufferQueueItf, BufferQueueCallback, wavFile_);
(8).开始录音
static void CaptureStart(SLRecordItf recordItf, SLOHBufferQueueItf bufferQueueItf, FILE *wavFile){ AUDIO_INFO_LOG("CaptureStart"); (*recordItf)->SetRecordState(recordItf, SL_RECORDSTATE_RECORDING); if (wavFile != nullptr) { SLuint8* buffer = nullptr; SLuint32 pSize = 0; (*bufferQueueItf)->GetBuffer(bufferQueueItf, &buffer, pSize); if (buffer != nullptr) { AUDIO_INFO_LOG("CaptureStart, enqueue buffer length: %{public}lu.", pSize); fwrite(buffer, 1, pSize, wavFile); (*bufferQueueItf)->Enqueue(bufferQueueItf, buffer, pSize); } else { AUDIO_INFO_LOG("CaptureStart, buffer is null or pSize: %{public}lu.", pSize); } } return;}
(9). 结束录音
static void CaptureStop(SLRecordItf recordItf){ AUDIO_INFO_LOG("Enter CaptureStop"); fflush(wavFile_); (*recordItf)->SetRecordState(recordItf, SL_RECORDSTATE_STOPPED); (*pcmCapturerObject)->Destroy(pcmCapturerObject); fclose(wavFile_); wavFile_ = nullptr; return;}