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I want to ask you if there is an API that plays a sound file (mp3,...) instead of microphone or change the input from microphone to speaker like stereo mix on windows .

Lizinh
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  • possible duplicate of [Stream audio to a phone call Android](http://stackoverflow.com/questions/5268964/stream-audio-to-a-phone-call-android) – StephenG Aug 10 '15 at 17:03

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I think you're looking for this question:

Stream audio to a phone call Android

Summary: You need to be rooted if you want to achieve that

Community
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StephenG
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