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chenxiaolong / BCR

A Basic Call Recorder for rooted Android devices
GNU General Public License v3.0
1.67k stars 109 forks source link

Is it possible to record calls at their originating volume? #317

Closed blackwind closed 1 year ago

blackwind commented 1 year ago

I just noticed that, when I reduce the volume of a call using the volume buttons on my device, BCR's recording mirrors that reduction -- the person on the other end is quiet on the recording, but I remain just as loud. Obviously less than ideal. Since you're capturing an internal stream, is it possible to capture that stream in its original state, as it arrived over the network, before the output volume adjustment is applied by the mixer?

chenxiaolong commented 1 year ago

As far as I'm aware, BCR is already capturing the most unprocessed audio that Android provides. At least on my previous Qualcomm devices, the actual raw audio stream from the IMS connection never leaves the modem firmware. I no longer have any interest in reverse engineering modem things, but I bet the situation is not too different on Pixels.

EDIT: Also related to this: it's not possible to record the input and output audio as separate streams either (eg. for manual volume correction).