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readme comments on raw format

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Alexey Kuznetsov 2024-09-26 23:46:23 +03:00
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@ -32,16 +32,18 @@ For example:
# Raw format
* Signed 16-bit PCM or float (depends on user settings)
Temporary recordings stored inside application specific data folders (described in Recording locations) with following format:
* Signed 16-bit PCM (2 bytes) or (4 bytes) Float (depends on Settings/Audio Format user setup)
* Big Endian
* 1 or 2 channels (depends on user settings). First 2 bytes for left channel, Second 2 bytes for right channel.
* 1 or 2 channels (depends on user settings). First 2/4 bytes for left channel, second 2/4 bytes for right channel.
* 16hz to 48hz Sample Rate / Frequincy (depends on user settings)
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.
* https://developer.android.com/reference/android/media/AudioFormat#encoding
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.
float mantisa is 23 bits (plus sign bit and float point bits) persition in range from -1..1 can hold about 2,130,706,431 unique numbers which is equivalent to 31 bits integer. When 24-bit PCM only gives you 2^24=16,777,216 unique values.
# Adb commands