Direct Music Player audio to Caller

Question

Assume you have a call. I would like to play a piece of one song to the caller at one point of discussion, while keeping your voice too in the discussion. I am using Android 6.0 CyanogenMod with Samsung Galaxy S4.

Edited: According to Media Playback's docs, the standard Android system does not allow the feature. However, I am interested in how this restriction works. If the feature works in non-rooted CyanogenMod, then it is not a restriction. Also, I am not sure if Media Playback's manual applies to the whole system.

How can you direct Music Player's output into the ongoing discussion?

Answer 1

You cannot

Media Playback developer documentation says (emphasis added)

You can play back the audio data only to the standard output device. Currently, that is the mobile device speaker or a Bluetooth headset. You cannot play sound files in the conversation audio during a call

Edit

In response to your edited question:

• I am not aware of Cyanogenmod permitting this- searching in their source code may give a clue
• To enable this, I presumed would require programming, so searched Stack Overflow and found this Why it is not possible to play an audio file on a voice call in android. This gives a couple of reasons, in answers as to why it is not possible - security and prioritization of audio
• It also suggests ways of achieving which are in programmers domain