Audio_Output Flag Direct

What is required to make Android use a new Audio HAL ...

https://stackoverflow.com/questions/39746221/what-is-required-to-make-android-use-a-new-audio-hal

Android 音频系统：从 AudioTrack 到 AudioFlinger - CSDN

https://blog.csdn.net/zyuanyun/article/details/60890534

audio_output_flag description; audio_output_flag_direct: 表示音频流直接输出到音频设备，不需要软件混音，一般用于 hdmi 设备声音输出

include/system/audio.h - platform/system/core - Git at Google

https://android.googlesource.com/platform/system/core/+/android-5.0.0_r2/include/system/audio.h

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 // present. It is opened by default and // receives routing, audio mode and …

Android Audio Playback Mode_ch853199769的博客 ... - CSDN

https://blog.csdn.net/ch853199769/article/details/79916166

直接输出线程,direct_output最终和这个线程有关。负责处理标识为 audio_output_flag_direct 的音频流，这种音频流数据不需要软件混音，直接输出到音频设备 ...

android 音频总结 - 简书

https://www.jianshu.com/p/5389a9abe2b9

flags = (audio_output_flags_t)(flags & ~AUDIO_OUTPUT_FLAG_DIRECT); output = selectOutput(outputs, flags, format); ALOGW_IF((output == 0), "getOutput() could not find output for stream %d, samplingRate %d,"

Audio output using a separate output from DirecTV to ...

https://forums.directv.com/conversations/directv-equipment/audio-output-using-a-separate-output-from-directv-to-receiver-and-television/610c0f82df08a4122a4675ec

Audio output using a separate output from DirecTV to receiver and television. Using a separate audio output on your DirecTV receiver connected to the television, if you want to be able to use the sound on your television without having to turn on the stereo receiver every time you watch TV.

关于播放模式的选择 - wulizhi - 博客园

https://www.cnblogs.com/wulizhi/p/8183658.html

AudioPolicyManager中进行的，它主要有以下判断标准：. 1). stream type必须是 AUDIO_STREAM_MUSIC. 2). 如果音源是PCM格式，audio.offload.pcm.enable 属性必须为true. 3). audio.offload.disable 属性必须为false. 4). 如果音源是Multichannel类型的，例如声道数大于2，并且是AAC或者FLAC格式的，也不 ...

Design For Reduced Latency - Android Open Source Project

https://source.android.com/devices/audio/latency/design

The normal mixer interacts extensively with the outside world, including binder threads, audio policy manager, fast mixer thread, and client tracks. The normal mixer's sink is a blocking pipe to the fast mixer's track 0. Flags. AUDIO_OUTPUT_FLAG_FAST bit is a hint. There's no guarantee the request will be fulfilled.