TTS的默认音频流是什么? [英] What is the default audio stream of TTS?
问题描述
据我所知,Android :
STREAM_ALARM (for alarms)
STREAM_DTMF (for DTMF Tones)
STREAM_MUSIC (for music playback)
STREAM_NOTIFICATION (for notifications)
STREAM_RING (for the phone ring)
STREAM_SYSTEM (for system sounds)
STREAM_VOICE_CALL (for phone calls)
我也知道可以明确地告诉TTS引擎使用哪个流:
I also know that it is possible to explicitly tell the TTS engine which stream to use:
params.put(TextToSpeech.Engine.KEY_PARAM_STREAM, String.valueOf(AudioManager.STREAM_ALARM));
mTts.speak(text, TextToSpeech.QUEUE_ADD, params);
但是,我找不到的是当我未指定音频流时默认使用的流.
What I couldn't find, however, is what stream is used by default when I don't specify an audio stream.
Android的TextToSpeech引擎的默认音频流是什么?
What is the default audio stream from Android's TextToSpeech engine?
是否可以查询Android的TextToSpeech引擎当前正在使用哪个流?
Is there a way to query which stream is currently being used by Android's TextToSpeech engine?
更新: TextToSpeech.Engine
的常量定义为
UPDATE: TextToSpeech.Engine
has a constant defined as DEFAULT_STREAM but it is unclear which of the 7 streams it is referring to. It has the same hex value (0x3) as STREAM_MUSIC, though. Is this it?
推荐答案
STREAM_MUSIC
是AOSP源代码中的默认值,定义在
STREAM_MUSIC
is the default in the AOSP source, defined in TextToSpeech.java (line 164 as of this writing) in frameworks/base.git
:
/**
* Default audio stream used when playing synthesized speech.
*/
public static final int DEFAULT_STREAM = AudioManager.STREAM_MUSIC;
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