audio_hw_device_open:调用audio device open 3、open_output_stream:打开output DevicesFactory::loadAudioInterface(const char *if_name, audio_hw_device_t **dev) rc = hw_get_module_by_class(AUDIO_HARDWARE_MODULE_ID, if_name, &mod); if (rc) { ALOGE("%s couldn't load audio hw module %s....
system/media/audio/include/system/audio_policy.h 1. 2. Android 5.1及之前的版本,头文件路径是: system/core/include/system/audio.h system/core/include/system/audio_policy.h 1. 2. 1.1 多声道支持 如果你的硬件和驱动支持通过HDMI的多声道(multi-channel)音频, 你可以直接输出音频流到音频硬件。这样就...
AUDIO_OUTPUT_FLAG_NONE = 0x0, // no attributes AUDIO_OUTPUT_FLAG_DIRECT = 0x1, // this output directly connects a track // to one output stream: no software mixer AUDIO_OUTPUT_FLAG_PRIMARY = 0x2, // this output is the primary output of // the device. It is unique and must be ...
AUDIO_OUTPUT_FLAG_FAST = 0x4, // output supports "fast tracks", 《==什么叫fast track?太难理解了!目前,java层的audiotrack只会使用第一个标志。 // defined elsewhere AUDIO_OUTPUT_FLAG_DEEP_BUFFER = 0x8 // use deep audio buffers 《==deep buffer是个什么玩意?这个马赛克是不是太大了点?现在完...
通过遍历HwModule,获取IOProfile并作为参数创建SwAudioOutputDescriptor,在做open来打开音频设备获取output 的id。 这里是以primary模块为例,使用hidl方式访问hal层。 4.4音频寻找设备流程 音频播放的时候会根据streamtype和attributes 寻找对应的strategy,在根据strategy寻找对应device,在根据device寻找对应的output。根据ooutput...
src/main/cpp/libopus/src/opus_multistream_decoder.c src/main/cpp/libopus/src/opus_multistream_encoder.c src/main/cpp/libopus/src/opus_multistream.c src/main/cpp/libopus/src/opus_encoder.c src/main/cpp/libopus/celt/celt_encoder.c ...
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 ...
// the plane height of a multi-planar (YUV) video bytebuffer layout int strideHeight = MediaFormat.getInteger(MediaFormat.KEY_SLICE_HEIGHT); // The left-coordinate (x) of the crop rectangle int cropLeft = MediaFormat.getInteger("crop-left"); ...
向下寻找到hal层,hardware/rockchip/audio/tinyalsa_hal/ 日志打印如下 听筒 start_output_stream:873 out = 0xf75a8000,device = 0x2,outputs[OUTPUT_HDMI_MULTI] = 0x0 AudioHardwareTiny: out->Device : 0x2 alsa_route: route_pcm_card_open(card 0, route 0) ...
Class for Multi-Band compressor bands MBC bands have multiple controllable parameters: enabled/disabled, cutoffFrequency, attackTime, releaseTime, ratio, threshold, kneeWidth, noiseGateThreshold, expanderRatio, preGain and postGain. DynamicsProcessing.Stage base class for the different stages. Environmenta...