alsa-project/alsa-lib pull request #62 was edited from aditpape:
Feature 'variable periodsize' allows to extend user period size up to buffer_size/2 independent of slave period. On enlargement of the settings for period_time.max and period_size.max the setting for openmax was not updated.
This lead to the effect, that if the slave period itself had openmax set it was still set on the extended size. Configuration of a period matching half buffer size was thus rejected.
Example for failure: period size of 384 (half buffer size) is requested which is rejected and rounded down to 352:
<pre> root@oracle-virtualbox:~# arecord -DDSNOOP_32 -r48000 -fS16_LE -c2 --period-size=382 -vv --dump-hw-params > /dev/null Recording WAVE 'stdin' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo HW Params of device "DSNOOP_32": -------------------- ACCESS: MMAP_INTERLEAVED MMAP_NONINTERLEAVED RW_INTERLEAVED RW_NONINTERLEAVED FORMAT: S16_LE SUBFORMAT: STD SAMPLE_BITS: 16 FRAME_BITS: 32 CHANNELS: 2 RATE: 48000 PERIOD_TIME: (666 7334) PERIOD_SIZE: [32 352] PERIOD_BYTES: [128 1408] PERIODS: [2 24] BUFFER_TIME: (1333 16000] BUFFER_SIZE: [64 768] BUFFER_BYTES: [256 3072] TICK_TIME: ALL -------------------- Direct Snoop PCM Its setup is: stream : CAPTURE access : RW_INTERLEAVED format : S16_LE subformat : STD channels : 2 rate : 48000 exact rate : 48000 (48000/1) msbits : 16 buffer_size : 704 period_size : 352 period_time : 7333 tstamp_mode : NONE tstamp_type : MONOTONIC period_step : 1 avail_min : 352 period_event : 0 start_threshold : 1 stop_threshold : 704 silence_threshold: 0 silence_size : 0 boundary : 6341068275337658368 Hardware PCM card 0 'Intel 82801AA-ICH' device 0 subdevice 0 Its setup is: stream : CAPTURE access : MMAP_INTERLEAVED format : S16_LE subformat : STD channels : 2 rate : 48000 exact rate : 48000 (48000/1) msbits : 16 buffer_size : 768 period_size : 32 period_time : 666 tstamp_mode : ENABLE tstamp_type : MONOTONIC period_step : 1 avail_min : 32 period_event : 0 start_threshold : 1 stop_threshold : 6917529027641081856 silence_threshold: 0 silence_size : 0 boundary : 6917529027641081856 appl_ptr : 0 hw_ptr : 224
When correctly applying the openmax setting:
root@oracle-virtualbox:~# arecord -DDSNOOP_32 -r48000 -fS16_LE -c2 --period-size=382 -vv --dump-hw-params > /dev/null Recording WAVE 'stdin' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo HW Params of device "DSNOOP_32": -------------------- ACCESS: MMAP_INTERLEAVED MMAP_NONINTERLEAVED RW_INTERLEAVED RW_NONINTERLEAVED FORMAT: S16_LE SUBFORMAT: STD SAMPLE_BITS: 16 FRAME_BITS: 32 CHANNELS: 2 RATE: 48000 PERIOD_TIME: (666 8000] PERIOD_SIZE: [32 384] PERIOD_BYTES: [128 1536] PERIODS: [2 24] BUFFER_TIME: (1333 16000] BUFFER_SIZE: [64 768] BUFFER_BYTES: [256 3072] TICK_TIME: ALL -------------------- Direct Snoop PCM Its setup is: stream : CAPTURE access : RW_INTERLEAVED format : S16_LE subformat : STD channels : 2 rate : 48000 exact rate : 48000 (48000/1) msbits : 16 buffer_size : 768 period_size : 384 period_time : 8000 tstamp_mode : NONE tstamp_type : MONOTONIC period_step : 1 avail_min : 384 period_event : 0 start_threshold : 1 stop_threshold : 768 silence_threshold: 0 silence_size : 0 boundary : 6917529027641081856 Hardware PCM card 0 'Intel 82801AA-ICH' device 0 subdevice 0 Its setup is: stream : CAPTURE access : MMAP_INTERLEAVED format : S16_LE subformat : STD channels : 2 rate : 48000 exact rate : 48000 (48000/1) msbits : 16 buffer_size : 768 period_size : 32 period_time : 666 tstamp_mode : ENABLE tstamp_type : MONOTONIC period_step : 1 avail_min : 32 period_event : 0 start_threshold : 1 stop_threshold : 6917529027641081856 silence_threshold: 0 silence_size : 0 boundary : 6917529027641081856 appl_ptr : 0 hw_ptr : 224 </pre>
Signed-off-by: Andreas Pape apape@de.adit-jv.com
Request URL : https://github.com/alsa-project/alsa-lib/pull/62 Patch URL : https://github.com/alsa-project/alsa-lib/pull/62.patch Repository URL: https://github.com/alsa-project/alsa-lib