AudioPolicyService.java 也会通过AudioSystem中的接口(如AudioSystem::get_audio_flinger())来获取AF实例。音量的控制也是调用AudioSystem中的接口(如AudioSystem::setVoiceVolume(data->mVolume))来控制,终于AS也是调用AF的接口来实现。 Ø AudioTrack(AT):
/vendor/qcom/proprietary/wfd/mm/source/framework/src/ – Contains the Wi-Fi Display (WFD) frameworks-related code; WFDMMSourceAudioSource.cpp configures the RT Proxy port via ALSA APIs and gets the PCM data from the audio layer /system/core/include/system/ – Contains audio.h and audio_pol...
MediaPlayer、MediaPlayerService和Stagefrightplayer作为Audio系统框架的Client端,最终由StagefrightPlayer将Audio数据交给Server端的AudioFlinger处理,由AudioFlinger将最终的Audio数据交由Audio HAL层输出到硬件设备上,完成Audio的播放。 从纵向的角度来看,上层的应用程序将媒体的URI作为输入,交给Java Framework层的MediaPlayer,经...
void AudioFlinger::onFirstRef(){Mutex::Autolock _l(mLock);/* TODO: move all this work into an Init() function */char val_str[PROPERTY_VALUE_MAX] = { 0 };if (property_get("ro.audio.flinger_standbytime_ms", val_str, NULL) >= 0) {uint32_t int_val;if (1 == sscanf(val_str...
ApplicationFramework通过Binder和音频服务进程通讯,对上提供AudioTrack的API。 3.代码结构 Audio Driver部分代码如下 Codec部分: Tfa9890驱动代码:/kernel/sound/soc/codecs/tfa Realtek5670驱动代码: /kernel/sound/soc/codec/rt5670.c /kernel/sound/soc/codec/rt5670-dsp.c /kernel/sound/soc/codec/rt5670.h Mac...
Framework 一、岗位职责1、负责android车载系统软件audio链路配置及相关问题处理;2、整理并封装audio hal相关接口并提供给应用层调用; 3、协助linux驱动工程师完善android系统audio相关驱动的衔接; 二、任职要求1、本科及以上学历;2、有扎实的C++和java语言基础,良好的工作习惯;3、熟练掌握AudioFocus、通道切换管理、播放...
详细源码解析见Android Framework分析(1)-init 初始化epoll,依次设置signal、property、keychord这3个fd可读时相对应的回调函数; 进入无限循环状态 init进程在开机之后的核心工作就是响应property变化事件和回收僵尸进程。当某个进程调用property_set来改变一个系统属性值时,系统会通过socket向init进程发送一个property变化的...
AudioEffect is the base class for controlling audio effects provided by the android audio framework. AudioEffect.ControlStatusChangeEventArgs Provides data for the ControlStatus event. AudioEffect.Descriptor The effect descriptor contains information on a particular effect implemented in the audio framewo...
init.rc文件是以“块”(section)为单位服务的,,一个“块”(section)可以包含多行。“块”(section)分成两大类:一类称为"动作(action)",另一类称为“服务(service)”。 动作(action):以关键字"on" 开头,表示一堆命令 服务(service):以关键字“service”开头,表示启动某个进程的方式和参数 ...
Returns whether direct playback of an audio format with the provided attributes is currently supported on the system. Direct playback means that the audio stream is not resampled or downmixed by the framework. Checking for direct support can help the app select the representation of audio content...