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5b5cd252d0
Replace the factor calculation from pcm-alsa.c, which is based on signal *power* ratios, with the fp_factor() calculation that is based on amplitude ratios. Because power changes with the square of amplitude, this means 1 dB of power equals 2 dB of amplitude. Rockbox's volume controls are amplitude-based, so the smallest step size for pcm-alsa was effectively 2 dB. The fp_factor() method supports 0.1 dB steps and is a bit more accurate besides, so it's simply superior in all respects (aside from taking a few more CPU cycles to calculate the factor). Change-Id: I34d143c225d8b5e085cde299fc405f83c13314bf |
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