harmony 鸿蒙OpenSL ES音频播放开发指导
OpenSL ES音频播放开发指导
简介
开发者可以通过本文档了解在OpenHarmony中如何使用OpenSL ES进行音频播放相关操作;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
开发指导
以下步骤描述了在OpenHarmony如何使用OpenSL ES开发音频播放功能:
添加头文件
#include <OpenSLES.h> #include <OpenSLES_OpenHarmony.h> #include <OpenSLES_Platform.h>
使用 slCreateEngine 接口和获取 engine 实例
SLObjectItf engineObject = nullptr; slCreateEngine(&engineObject, 0, nullptr, 0, nullptr, nullptr); (*engineObject)->Realize(engineObject, SL_BOOLEAN_FALSE);
获取接口 SL_IID_ENGINE 的 engineEngine 实例
SLEngineItf engineEngine = nullptr; (*engineObject)->GetInterface(engineObject, SL_IID_ENGINE, &engineEngine);
配置播放器信息,创建 AudioPlayer
SLDataLocator_BufferQueue slBufferQueue = { SL_DATALOCATOR_BUFFERQUEUE, 0 }; // 具体参数需要根据音频文件格式进行适配 SLDataFormat_PCM pcmFormat = { SL_DATAFORMAT_PCM, 2, 48000, 16, 0, 0, 0 }; SLDataSource slSource = {&slBufferQueue, &pcmFormat}; SLObjectItf pcmPlayerObject = nullptr; (*engineEngine)->CreateAudioPlayer(engineEngine, &pcmPlayerObject, &slSource, null, 0, nullptr, nullptr); (*pcmPlayerObject)->Realize(pcmPlayerObject, SL_BOOLEAN_FALSE);
获取接口 SL_IID_OH_BUFFERQUEUE 的 bufferQueueItf 实例
SLOHBufferQueueItf bufferQueueItf; (*pcmPlayerObject)->GetInterface(pcmPlayerObject, SL_IID_OH_BUFFERQUEUE, &bufferQueueItf);
打开音频文件,注册 BufferQueueCallback 回调
FILE *wavFile_ = nullptr; static void BufferQueueCallback (SLOHBufferQueueItf bufferQueueItf, void *pContext, SLuint32 size) { FILE *wavFile = (FILE *)pContext; if (!feof(wavFile)) { SLuint8 *buffer = nullptr; SLuint32 pSize = 0; (*bufferQueueItf)->GetBuffer(bufferQueueItf, &buffer, pSize); //从文件读取数据 fread(buffer, 1, size, wavFile); (*bufferQueueItf)->Enqueue(bufferQueueItf, buffer, size); } return; } // wavFile_ 需要设置为用户想要播放的文件描述符 wavFile_ = fopen(path, "rb"); (*bufferQueueItf)->RegisterCallback(bufferQueueItf, BufferQueueCallback, wavFile_);
获取接口 SL_PLAYSTATE_PLAYING 的 playItf 实例,开始播放
SLPlayItf playItf = nullptr; (*pcmPlayerObject)->GetInterface(pcmPlayerObject, SL_IID_PLAY, &playItf); (*playItf)->SetPlayState(playItf, SL_PLAYSTATE_PLAYING);
结束音频播放
(*playItf)->SetPlayState(playItf, SL_PLAYSTATE_STOPPED); (*pcmPlayerObject)->Destroy(pcmPlayerObject); (*engineObject)->Destroy(engineObject);
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