[ALSA - utils 0001990]: aplay/arecord cannot play/capture A_LAW

[bugtrack@alsa-project.org]

A NOTE has been added to this issue.
======================================================================
<https://bugtrack.alsa-project.org/alsa-bug/view.php?id=1990> 
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Reported By:                Raymond
Assigned To:                
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Project:                    ALSA - utils
Issue ID:                   1990
Category:                   aplay/arecord
Reproducibility:            always
Severity:                   major
Priority:                   normal
Status:                     new
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Date Submitted:             04-01-2006 04:26 CEST
Last Modified:              04-07-2006 19:32 CEST
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Summary:                    aplay/arecord cannot play/capture A_LAW
Description: 
aplay/arecord can play MU_LAW and the sound card support MU_LAW and A_LAW

arecord -D hw:0,0 -f MU_LAW -t au -c 1 -r 8000 test.au

aplay -D hw:0,0 test.au


Try to use -t raw but the quality of A_LAW is very bad when compare with
MU_LAW

arecord -D hw:0,0 -f A_LAW -t raw -c 1 -r 8000 test.raw

aplay -D hw:0,0 test.raw


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----------------------------------------------------------------------
 Raymond - 04-03-06 07:36 
----------------------------------------------------------------------
pcm.convert {
        type alaw  
        slave {
		pcm "hw:0"
		format A_LAW
	}
}


aplay -v -Dconvert test.wav
Playing WAVE 'test.wav' : Signed 16 bit Little Endian, Rate 8000 Hz, Mono
A-Law conversion PCM (A_LAW)
Its setup is:
  stream       : PLAYBACK
  access       : RW_INTERLEAVED
  format       : S16_LE
  subformat    : STD
  channels     : 1
  rate         : 8000
  exact rate   : 8000 (8000/1)
  msbits       : 16
  buffer_size  : 4096
  period_size  : 1024
  period_time  : 128000
  tick_time    : 10000
  tstamp_mode  : NONE
  period_step  : 1
  sleep_min    : 0
  avail_min    : 1024
  xfer_align   : 1024
  start_threshold  : 4096
  stop_threshold   : 4096
  silence_threshold: 0
  silence_size : 0
  boundary     : 1073741824
Slave: Hardware PCM card 0 'au8830' device 0 subdevice 0
Its setup is:
  stream       : PLAYBACK
  access       : MMAP_INTERLEAVED
  format       : A_LAW
  subformat    : STD
  channels     : 1
  rate         : 8000
  exact rate   : 8000 (8000/1)
  msbits       : 8
  buffer_size  : 4096
  period_size  : 1024
  period_time  : 128000
  tick_time    : 10000
  tstamp_mode  : NONE
  period_step  : 1
  sleep_min    : 0
  avail_min    : 1024
  xfer_align   : 1024
  start_threshold  : 4096
  stop_threshold   : 4096
  silence_threshold: 0
  silence_size : 0
  boundary     : 1073741824

It seem that the plugin alaw work , the sound play at expected quality

This mean that aplay/arecord only need to implement read/write the A_LAW
audio in a suitable file format

----------------------------------------------------------------------
 tiwai - 04-07-06 19:32 
----------------------------------------------------------------------
aplay doesn't support A-law in .au format.

Issue History
Date Modified  Username       Field                    Change              
======================================================================
04-01-06 04:26 Raymond        New Issue                                    
04-03-06 07:16 Raymond        Note Added: 0009085                          
04-03-06 07:36 Raymond        Note Added: 0009086                          
04-07-06 19:32 tiwai          Note Added: 0009152                          
======================================================================




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