From 639c0082bf25da19cb833622df84e261221a3398 Mon Sep 17 00:00:00 2001 From: xufulong <839789740@qq.com> Date: Tue, 14 Apr 2020 23:44:07 +0800 Subject: [PATCH] translate audio_player.c into English translate audio_player.c into English --- app/src/main/cpp/openSL_audio_player.c | 91 ++++++++------------------ 1 file changed, 26 insertions(+), 65 deletions(-) diff --git a/app/src/main/cpp/openSL_audio_player.c b/app/src/main/cpp/openSL_audio_player.c index 2f2abe5..82412c4 100644 --- a/app/src/main/cpp/openSL_audio_player.c +++ b/app/src/main/cpp/openSL_audio_player.c @@ -17,29 +17,28 @@ #define TAG "OpenSLPlayer" -//引擎接口 +//object of engine SLObjectItf engineObject = NULL; SLEngineItf engineEngine; -//输出混音器接口 +//object of mixer SLObjectItf outputMixObject = NULL; SLEnvironmentalReverbItf outputMixEnvironmentalReverb = NULL; -//缓冲播放器接口 +//object of buffer SLObjectItf bqPlayerObject = NULL; SLPlayItf bqPlayerPlay; SLAndroidSimpleBufferQueueItf bqPlayerBufferQueue; SLEffectSendItf bqPlayerEffectSend; SLVolumeItf bqPlayerVolume; -//音效设置 +//audio effect const SLEnvironmentalReverbSettings reverbSettings = SL_I3DL2_ENVIRONMENT_PRESET_STONECORRIDOR; void *buffer; size_t bufferSize; uint8_t *outputBuffer; size_t outputBufferSize; -//FFmpeg相关 AVPacket packet; int audioStream; AVFrame *aFrame; @@ -48,48 +47,40 @@ AVFormatContext *aFormatCtx; AVCodecContext *aCodecCtx; int frame_count = 0; -int createAudioPlayer(int *rate, int *channel, const char *file_name) ; +int createAudioPlayer(int *rate, int *channel, const char *file_name); -// 释放相关资源 int releaseAudioPlayer(); -// 获取PCM数据, 自动回调获取 -int getPCM(void **pcm, size_t *pcmSize) ; +int getPCM(void **pcm, size_t *pcmSize); -//播放回调方法 +//callback by player void bqPlayerCallback(SLAndroidSimpleBufferQueueItf bufferQueueItf, void *context) { bufferSize = 0; getPCM(&buffer, &bufferSize); - //如果buffer不为空，入待播放队列 if (NULL != buffer && 0 != bufferSize) { SLresult result; result = (*bqPlayerBufferQueue)->Enqueue(bqPlayerBufferQueue, buffer, bufferSize); - if(result < 0){ + if (result < 0) { LOGE(TAG, "Enqueue error..."); - } else{ + } else { LOGI(TAG, "decode frame count=%d", frame_count++); } } } -//创建OpenSLES引擎 +//create the engine of OpenSLES void createEngine() { SLresult result; - //创建引擎 result = slCreateEngine(&engineObject, 0, NULL, 0, NULL, NULL); LOGI(TAG, "slCreateEngine=%d", result); result = (*engineObject)->Realize(engineObject, SL_BOOLEAN_FALSE); LOGI(TAG, "engineObject->Realize=%d", result); - //获取引擎接口 result = (*engineObject)->GetInterface(engineObject, SL_IID_ENGINE, &engineEngine); LOGI(TAG, "engineObject->GetInterface=%d", result); - //创建输出混音器 result = (*engineEngine)->CreateOutputMix(engineEngine, &outputMixObject, 0, 0, 0); LOGI(TAG, "CreateOutputMix=%d", result); - //关联输出混音器 result = (*outputMixObject)->Realize(outputMixObject, SL_BOOLEAN_FALSE); LOGI(TAG, "outputMixObject->Realize=%d", result); - //获取reverb接口 result = (*outputMixObject)->GetInterface(outputMixObject, SL_IID_ENVIRONMENTALREVERB, &outputMixEnvironmentalReverb); LOGI(TAG, "outputMixObject->GetInterface=%d", result); @@ -101,12 +92,12 @@ void createEngine() { } -//创建带有缓冲队列的音频播放器 void createBufferQueueAudioPlayer(int rate, int channel, int bitsPerSample) { SLresult result; - //配置音频源 - SLDataLocator_AndroidSimpleBufferQueue buffer_queue = {SL_DATALOCATOR_ANDROIDSIMPLEBUFFERQUEUE, 2}; + //config audio source + SLDataLocator_AndroidSimpleBufferQueue buffer_queue = {SL_DATALOCATOR_ANDROIDSIMPLEBUFFERQUEUE, + 2}; SLDataFormat_PCM format_pcm; format_pcm.formatType = SL_DATAFORMAT_PCM; format_pcm.numChannels = (SLuint32) channel; @@ -120,66 +111,54 @@ void createBufferQueueAudioPlayer(int rate, int channel, int bitsPerSample) { format_pcm.endianness = SL_BYTEORDER_LITTLEENDIAN; SLDataSource audioSrc = {&buffer_queue, &format_pcm}; - //配置音频池 SLDataLocator_OutputMix loc_outmix = {SL_DATALOCATOR_OUTPUTMIX, outputMixObject}; SLDataSink audioSnk = {&loc_outmix, NULL}; - //创建音频播放器 const SLInterfaceID ids[3] = {SL_IID_BUFFERQUEUE, SL_IID_EFFECTSEND, SL_IID_VOLUME}; const SLboolean req[3] = {SL_BOOLEAN_TRUE, SL_BOOLEAN_TRUE, SL_BOOLEAN_TRUE}; result = (*engineEngine)->CreateAudioPlayer(engineEngine, &bqPlayerObject, &audioSrc, &audioSnk, 3, ids, req); LOGI(TAG, "CreateAudioPlayer=%d", result); - //关联播放器 result = (*bqPlayerObject)->Realize(bqPlayerObject, SL_BOOLEAN_FALSE); LOGI(TAG, "bqPlayerObject Realize=%d", result); - //获取播放接口 result = (*bqPlayerObject)->GetInterface(bqPlayerObject, SL_IID_PLAY, &bqPlayerPlay); LOGI(TAG, "GetInterface bqPlayerPlay=%d", result); - //获取缓冲队列接口 result = (*bqPlayerObject)->GetInterface(bqPlayerObject, SL_IID_BUFFERQUEUE, &bqPlayerBufferQueue); LOGI(TAG, "GetInterface bqPlayerBufferQueue=%d", result); - //注册缓冲队列回调 result = (*bqPlayerBufferQueue)->RegisterCallback(bqPlayerBufferQueue, bqPlayerCallback, NULL); LOGI(TAG, "RegisterCallback=%d", result); - //获取音效接口 result = (*bqPlayerObject)->GetInterface(bqPlayerObject, SL_IID_EFFECTSEND, &bqPlayerEffectSend); LOGI(TAG, "GetInterface effect=%d", result); - //获取音量接口 result = (*bqPlayerObject)->GetInterface(bqPlayerObject, SL_IID_VOLUME, &bqPlayerVolume); LOGI(TAG, "GetInterface volume=%d", result); - //开始播放音乐 result = (*bqPlayerPlay)->SetPlayState(bqPlayerPlay, SL_PLAYSTATE_PLAYING); LOGI(TAG, "SetPlayState=%d", result); } int createAudioPlayer(int *rate, int *channel, const char *file_name) { - //注册相关组件 + av_register_all(); aFormatCtx = avformat_alloc_context(); - //打开音频文件 if (avformat_open_input(&aFormatCtx, file_name, NULL, NULL) != 0) { LOGE(TAG, "Couldn't open file:%s\n", file_name); - return -1; // Couldn't open file + return -1; } - //寻找stream信息 if (avformat_find_stream_info(aFormatCtx, NULL) < 0) { LOGE(TAG, "Couldn't find stream information."); return -1; } - //寻找音频stream int i; audioStream = -1; for (i = 0; i < aFormatCtx->nb_streams; i++) { @@ -192,64 +171,56 @@ int createAudioPlayer(int *rate, int *channel, const char *file_name) { LOGE(TAG, "Couldn't find audio stream!"); return -1; } - //获取解码器context + aCodecCtx = aFormatCtx->streams[audioStream]->codec; - //寻找音频解码器 AVCodec *aCodec = avcodec_find_decoder(aCodecCtx->codec_id); if (!aCodec) { fprintf(stderr, "Unsupported codec!\n"); return -1; } - //打开解码器 if (avcodec_open2(aCodecCtx, aCodec, NULL) < 0) { LOGE(TAG, "Could not open codec."); return -1; } aFrame = av_frame_alloc(); - // 设置格式转换 swr = swr_alloc(); - av_opt_set_int(swr, "in_channel_layout", aCodecCtx->channel_layout, 0); - av_opt_set_int(swr, "out_channel_layout", aCodecCtx->channel_layout, 0); - av_opt_set_int(swr, "in_sample_rate", aCodecCtx->sample_rate, 0); - av_opt_set_int(swr, "out_sample_rate", aCodecCtx->sample_rate, 0); - av_opt_set_sample_fmt(swr, "in_sample_fmt", aCodecCtx->sample_fmt, 0); - av_opt_set_sample_fmt(swr, "out_sample_fmt", AV_SAMPLE_FMT_S16, 0); + av_opt_set_int(swr, "in_channel_layout", aCodecCtx->channel_layout, 0); + av_opt_set_int(swr, "out_channel_layout", aCodecCtx->channel_layout, 0); + av_opt_set_int(swr, "in_sample_rate", aCodecCtx->sample_rate, 0); + av_opt_set_int(swr, "out_sample_rate", aCodecCtx->sample_rate, 0); + av_opt_set_sample_fmt(swr, "in_sample_fmt", aCodecCtx->sample_fmt, 0); + av_opt_set_sample_fmt(swr, "out_sample_fmt", AV_SAMPLE_FMT_S16, 0); swr_init(swr); - // 分配PCM数据缓存 outputBufferSize = 8196; outputBuffer = (uint8_t *) malloc(sizeof(uint8_t) * outputBufferSize); - // 返回sample rate和channels *rate = aCodecCtx->sample_rate; *channel = aCodecCtx->channels; return 0; } -// 获取PCM数据, 自动回调获取 int getPCM(void **pcm, size_t *pcmSize) { while (av_read_frame(aFormatCtx, &packet) >= 0) { int frameFinished = 0; - //音频流 + //is audio stream if (packet.stream_index == audioStream) { avcodec_decode_audio4(aCodecCtx, aFrame, &frameFinished, &packet); - //解码完一帧数据 + //decode success if (frameFinished) { - // data_size为音频数据所占的字节数 int data_size = av_samples_get_buffer_size( aFrame->linesize, aCodecCtx->channels, aFrame->nb_samples, aCodecCtx->sample_fmt, 1); if (data_size > outputBufferSize) { outputBufferSize = (size_t) data_size; - outputBuffer = (uint8_t *) realloc(outputBuffer, sizeof(uint8_t) * outputBufferSize); + outputBuffer = (uint8_t *) realloc(outputBuffer, + sizeof(uint8_t) * outputBufferSize); } - // 音频格式转换 swr_convert(swr, &outputBuffer, aFrame->nb_samples, (uint8_t const **) (aFrame->extended_data), aFrame->nb_samples); - // 返回pcm数据 *pcm = outputBuffer; *pcmSize = (size_t) data_size; return 0; @@ -259,7 +230,6 @@ int getPCM(void **pcm, size_t *pcmSize) { return -1; } -// 释放相关资源 int releaseAudioPlayer() { av_packet_unref(&packet); av_free(outputBuffer); @@ -275,20 +245,12 @@ AUDIO_PLAYER_FUNC(void, playAudio, jstring filePath) { const char *file_name = (*env)->GetStringUTFChars(env, filePath, NULL); LOGI(TAG, "file_name=%s", file_name); - // 创建音频解码器 createAudioPlayer(&rate, &channel, file_name); - - // 创建播放引擎 createEngine(); - - // 创建缓冲队列音频播放器 createBufferQueueAudioPlayer(rate, channel, SL_PCMSAMPLEFORMAT_FIXED_16); - - // 启动音频播放 bqPlayerCallback(bqPlayerBufferQueue, NULL); } -//停止播放，释放相关资源 AUDIO_PLAYER_FUNC(void, stop) { if (bqPlayerObject != NULL) { (*bqPlayerObject)->Destroy(bqPlayerObject); @@ -311,6 +273,5 @@ AUDIO_PLAYER_FUNC(void, stop) { engineEngine = NULL; } - // 释放解码器相关资源 releaseAudioPlayer(); }