Hello.
While testing application support for weird-rate cards (such as snd-pcsp), I found a bug in alsa-lib. Alsa-plugins are installed, so the "libspeex (builtin)" rate converter is used. This bug already exists in alsa-plugins 1.0.27.2, so not a regression and thus should not block 1.0.28.
$ file test.wav test.wav: RIFF (little-endian) data, WAVE audio, Microsoft PCM, 16 bit, stereo 32000 Hz
$ aplay -vvv -D plughw:pcsp test.wav Playing WAVE 'test.wav' : Signed 16 bit Little Endian, Rate 32000 Hz, Stereo aplay: set_params:1297: Unable to install hw params: ACCESS: RW_INTERLEAVED FORMAT: S16_LE SUBFORMAT: STD SAMPLE_BITS: 16 FRAME_BITS: 32 CHANNELS: 2 RATE: NONE PERIOD_TIME: (125006 125007) PERIOD_SIZE: NONE PERIOD_BYTES: (16000 16004) PERIODS: (3 4) BUFFER_TIME: 500000 BUFFER_SIZE: 16000 BUFFER_BYTES: 64000 TICK_TIME: 0
The pcsp device supports the sample rate of 37286 Hz.
Files with 44100 Hz sample rate work fine.
$ aplay -vv -D plughw:pcsp -f cd /dev/zero Playing raw data '/dev/zero' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo Plug PCM: Route conversion PCM (sformat=S16_LE) Transformation table: 0 <- 0*0,5 + 1*0,5 Its setup is: stream : PLAYBACK access : RW_INTERLEAVED format : S16_LE subformat : STD channels : 2 rate : 44100 exact rate : 44100 (44100/1) msbits : 16 buffer_size : 22050 period_size : 5512 period_time : 125006 tstamp_mode : NONE period_step : 1 avail_min : 5512 period_event : 0 start_threshold : 22050 stop_threshold : 22050 silence_threshold: 0 silence_size : 0 boundary : 6206523236469964800 Slave: Rate conversion PCM (37286, sformat=S16_LE) Converter: libspeex (builtin) Protocol version: 10002 Its setup is: stream : PLAYBACK access : MMAP_INTERLEAVED format : S16_LE subformat : STD channels : 1 rate : 44100 exact rate : 44100 (44100/1) msbits : 16 buffer_size : 22050 period_size : 5512 period_time : 125006 tstamp_mode : NONE period_step : 1 avail_min : 5512 period_event : 0 start_threshold : 22050 stop_threshold : 22050 silence_threshold: 0 silence_size : 0 boundary : 6206523236469964800 Slave: Hardware PCM card 2 'pcsp' device 0 subdevice 0 Its setup is: stream : PLAYBACK access : MMAP_INTERLEAVED format : S16_LE subformat : STD channels : 1 rate : 37286 exact rate : 37286 (37286/1) msbits : 16 buffer_size : 18644 period_size : 4661 period_time : 125006 tstamp_mode : NONE period_step : 1 avail_min : 4661 period_event : 0 start_threshold : 18644 stop_threshold : 18644 silence_threshold: 0 silence_size : 0 boundary : 5247819465793470464 appl_ptr : 0 hw_ptr : 0 #+ | 00%^C