Recording stereo with AudioRecord in Android
I'm looking for a definitive answer to getting audio recordings to use both top-mounted and bottom-mounted microphones, so I don't have two identical (mono) channels. I would like to know what kind of poll I could do before the gadget provides a good flow.
I am working on galaxy nexus 5 and cannot get it to work, so I am not sure if it is stable on all devices.
I've tried everything
AudioRecord audioInputStream1 = new AudioRecord(Media.Recorder.CAMCORDER, AudioFormat.CHANNEL_IN_STEREO, AudioFormat.ENCODING_PCM_16BIT, samplesPerBuffer * bytesPerSample)
and also creating two records:
AudioRecord audioInputStream1 = new AudioRecord(Media.Recorder.MIC, AudioFormat.CHANNEL_IN_MONO, AudioFormat.ENCODING_PCM_16BIT, samplesPerBuffer * bytesPerSample) AudioRecord audioInputStream2 = new AudioRecord(Media.Recorder.CAMCORDER, AudioFormat.CHANNEL_IN_MONO, AudioFormat.ENCODING_PCM_16BIT, samplesPerBuffer * bytesPerSample)
If anyone could get a stereo recording on Bundle 5, I would be very grateful for your help. Should I go to alsa or tinyAlsa?
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Your question is closely related to my question , and it seems that the answer is device dependent:
1) For some devices (for example, Samsung S2 Plus GT-I9105P, HTC One M7, HTC One M8, G3 LG-D855, Nexus 5, ...) there is simply no way to activate real stereo recordings through the built-in microphone capsules. While in some cases the manufacturer's video camera app produces a real stereo system, you won't find another app that can do this.
2) For some other devices, only a few specific combinations
and, for example, the sampling rate (or other basic settings) allows for real stereo recording (for example, the Motorola Moto G also requires
a sampling rate of 48 kHz ).
3) On most devices with two microphone capsules, it is
enough to activate real stereo recording.
Unfortunately, Alsa or tinyAlsa most likely won't fix the problem without rooting the device.
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