50 lines
1.8 KiB
Markdown
50 lines
1.8 KiB
Markdown
# Know bugs
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None
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# Recording locations
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Android has several storage locations:
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* /data/data/ - internal user storage on new android
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* /storage/self/primary/ - internal storage
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* /storage/emulated/0/ - external storage (sdcard formated as internal or emulated external)
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* /storage/1D13-0F08/ - sdcard formated as portable
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Some Androids can have more:
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/storage/sdcard - emulated external sdcard
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/data/user/0/ - internal user storage
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/sdcard - link for default extenral storage /storage/emulated/0/
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Plus application / user specified folders (all combinations of):
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* .../Android/data/com.github.axet.audiorecorder/files
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* .../com.github.axet.audiorecorder/files
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* .../Audio Recorder
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For example:
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* /data/data/com.github.axet.audiorecorder/files
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* /data/user/0/com.github.axet.audiorecorder/files
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* /sdcard/Android/data/com.github.axet.audiorecorder/files
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* /sdcard/Audio Recorder
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# Raw format
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* Signed 16-bit PCM or float (depends on user settings)
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* Big Endian
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* 1 or 2 channels (depends on user settings). First 2 bytes for left channel, Second 2 bytes for right channel.
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* 16hz to 48hz Sample Rate / Frequincy (depends on user settings)
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Android supports 16-bit PCM format or PCM float. Android recomends to use PCM float over 24-bit PCM format or 16-bit PCM if possible.
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* https://developer.android.com/reference/android/media/AudioFormat#encoding
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float mantisa is 23 bits (plus sign bit and float point bits) persition in range from -1..1 can hold about 2130706431 unique numbers which is equivalent to 31 bits integer. When 24-bit PCM only gives you 2^24=16,777,216 unique values.
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# Adb commands
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# adb shell am start -n com.github.axet.audiorecorder/.activities.RecordingActivity
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# adb shell am broadcast -a com.github.axet.audiorecorder.STOP_RECORDING
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