On Wed, 14 Sep 2016 08:24:45 +0200 Alexandre Ratchov <a...@caoua.org> wrote:
> the diff was forgotten, it's discussed here: > > http://marc.info/?l=openbsd-ports&m=145505706611958 > > It's about playing 24-bit files with full precision (assuming audio > sub-system supports it), i.e. without converting samples to 16-bit > first and loosing 8-bits of precision. > > OK? [diff omitted] Thank you Alexandre, this is nice! Both playback and recording with 24bit precision appear to work for me. (Recording turntable->phono preamp->line-in on the on-board sound card.) One thing I noticed: when recording with sndiod running, sox prints "Precision : 24-bit" but when sndiod is disabled, it prints "Precision : 32-bit" when using the same command. The resulting files are in the same format though - here is the full transcript of how I checked that: HAMLET: /tmp/0 $ doas rcctl start sndiod sndiod(ok) HAMLET: /tmp/0 $ rec -t wav -c 2 -r 48000 -b 24 test1.wav Input File : 'default' (sndio) Channels : 2 Sample Rate : 48000 Precision : 24-bit Sample Encoding: 24-bit Signed Integer PCM In:0.00% 00:00:08.36 [00:00:00.00] Out:397k [!=====|=====!] Hd:0.0 Clip:0 ^C Aborted. HAMLET: /tmp/0 $ doas rcctl stop sndiod sndiod(ok) HAMLET: /tmp/0 $ rec -t wav -c 2 -r 48000 -b 24 test2.wav Input File : 'default' (sndio) Channels : 2 Sample Rate : 48000 Precision : 32-bit Sample Encoding: 32-bit Signed Integer PCM In:0.00% 00:00:15.45 [00:00:00.00] Out:737k [ ====|===- ] Hd:1.2 Clip:0 ^C Aborted. HAMLET: /tmp/0 $ file * test1.wav: RIFF (little-endian) data, WAVE audio, stereo 48000 Hz test2.wav: RIFF (little-endian) data, WAVE audio, stereo 48000 Hz HAMLET: /tmp/0 $ ffmpeg -i test1.wav 2>&1 | grep Stream Stream #0:0: Audio: pcm_s24le ([1][0][0][0] / 0x0001), 48000 Hz, stereo, s32 (24 bit), 2304 kb/s HAMLET: /tmp/0 $ ffmpeg -i test2.wav 2>&1 | grep Stream Stream #0:0: Audio: pcm_s24le ([1][0][0][0] / 0x0001), 48000 Hz, stereo, s32 (24 bit), 2304 kb/s
