[alsa-devel] How to choose output channels for AD1386A sound?
Hello! I build my BF533-EZKIT-based board (Blackfin processor development board) sound system on AD1386A sound. I use blackfin.uclinux.org distribution for it. One of my board's function is to play three different stereo sound streams simultaneously on it. What I done is choosing for AD1386 '3 stereos' option. After loading the kernel, my software is able to open pcm 3 times and plays sound properly, with no glitches or smth. The only missed functionality is that I can't specify the needed subdevice I want to play a stream on. I should have the possibility to play, f.e., mplayer stream on the 3rd stereo output while the 1st and the 2nd are not used. How can I do it? Also that would be great if I can optionally play the same stream on all the outputs. If I'm not wrong, this can be made through asound.conf settings though I can't figer out what are the right values. If I can choose next used output through kernel interface (kobject value or smth) then please tell me where should I look into.
Here are some info (line-in playing on the 1st subdevice):
root:~> aplay -l **** List of PLAYBACK Hardware Devices **** card 0: ad1836 [ADI ad1836], device 0: AD1836_PCM [AD1836_PCM] Subdevices: 2/3 Subdevice #0: subdevice #0 Subdevice #1: subdevice #1 Subdevice #2: subdevice #2
root:~> cat /proc/asound/devices 0: [ 0] : control 16: [ 0- 0]: digital audio playback 24: [ 0- 0]: digital audio capture 33: : timer
root:~> cat /proc/asound/pcm 00-00: AD1836_PCM : AD1836_PCM : playback 3 : capture 1
root:~> cat /proc/asound/cards 0 [ad1836 ]: AD1836 - ADI ad1836 ADI ad1836 at PF4 SPORT0 rx/tx dma 1/2 err irq 10
root:~> cat /proc/asound/ad1836/registers DAC_CTRL_1 0x0000 DAC_CTRL_2 0x1000 DAC_VOL_1L 0x23ff DAC_VOL_1R 0x33ff DAC_VOL_2L 0x43fa DAC_VOL_2R 0x53fa DAC_VOL_3L 0x63fa DAC_VOL_3R 0x73fa ADC_PEAK_1L 0xffff -63 dBFS ADC_PEAK_1R 0xffff -63 dBFS ADC_PEAK_2L 0xffff -63 dBFS ADC_PEAK_2R 0xffff -63 dBFS ADC_CTRL_1 0xc000 ADC_CTRL_2 0xd180 ADC_CTRL_3 0xe03a
root:~> cat /proc/asound/ad1836/pcm0p/info card: 0 device: 0 subdevice: 0 stream: PLAYBACK id: AD1836_PCM name: AD1836_PCM subname: subdevice #0 class: 0 subclass: 0 subdevices_count: 3 subdevices_avail: 2
root:~> ls /proc/asound/ad1836/pcm0p/ info oss sub0 sub1 sub2 xrun_debug
root:~> cat /proc/asound/ad1836/pcm0p/sub0/status state: RUNNING trigger_time: 1208611073.963748000 tstamp : 1208611991.506408000 delay : 6441 avail : 1751 avail_max : 6188 ----- hw_ptr : 44035799 appl_ptr : 44042240
root:~> cat /proc/asound/ad1836/pcm0p/sub1/status closed
root:~> cat /proc/asound/ad1836/pcm0p/sub2/status closed
Thanks for help.
At Thu, 17 Apr 2008 10:27:59 +0000, Ihar Hrachyshka wrote:
Hello! I build my BF533-EZKIT-based board (Blackfin processor development board) sound system on AD1386A sound. I use blackfin.uclinux.org distribution for it. One of my board's function is to play three different stereo sound streams simultaneously on it. What I done is choosing for AD1386 '3 stereos' option. After loading the kernel, my software is able to open pcm 3 times and plays sound properly, with no glitches or smth. The only missed functionality is that I can't specify the needed subdevice I want to play a stream on. I should have the possibility to play, f.e., mplayer stream on the 3rd stereo output while the 1st and the 2nd are not used. How can I do it?
You can pass three numbers to PCM arguments: card, device and subdevice. For example, the below will choose card = 0, device = 2, subdevice = 1, i.e. the secondary substream: % aplay -Dplughw:0,2,1
Also that would be great if I can optionally play the same stream on all the outputs.
You'll need to define a PCM with multi plugin.
Takashi
On Thu, Apr 17, 2008 at 2:57 PM, Takashi Iwai tiwai@suse.de wrote:
At Thu, 17 Apr 2008 10:27:59 +0000,
Ihar Hrachyshka wrote:
Hello! I build my BF533-EZKIT-based board (Blackfin processor development board) sound system on AD1386A sound. I use blackfin.uclinux.org distribution for it. One of my board's function is to play three different stereo sound streams simultaneously on it. What I done is choosing for AD1386 '3 stereos' option. After loading the kernel, my software is able to open pcm 3 times and plays sound properly, with no glitches or smth. The only missed functionality is that I can't specify the needed subdevice I want to play a stream on. I should have the possibility to play, f.e., mplayer stream on the 3rd stereo output while the 1st and the 2nd are not used. How can I do it?
You can pass three numbers to PCM arguments: card, device and subdevice. For example, the below will choose card = 0, device = 2, subdevice = 1, i.e. the secondary substream: % aplay -Dplughw:0,2,1
That's what I've done:
# arecord -c 2 -f dat -d 30 a.wav # aplay -Dplughw:0,0,0 a.wav ALSA sound/blackfin/ad1836.c:924: snd_ad1836_playback_open Playing WAVE 'aAwLvS A isnodu1n di/ biltaecEkdfai,nR/ta d8108 3z6 .tcr:o1
046: snd_ad1836_hw_free ALSA lib ../../../alsa-lib-1.0.12-svn-rev6478/src/pcm/pcm_plug.c:773:(snd_pcm_plug_hw_refine_schange) find an usable access for 'plughw:0,0,0' aplay: set_params:904: Sample format non available
# arecord -c 2 -f S32_LE -d 30 a.wav # aplay -Dplughw:0,0,0 a.wav ALSA sound/blackfin/ad1836.c:924: snd_ad1836_playback_open Playing WAVEA'L.SaA' :sSoguen d2/bbtlLatclk fniinn/ aade18803 6z. ct:r1o0
46: snd_ad1836_hw_free ALSA lib ../../../alsa-lib-1.0.12-svn-rev6478/src/pcm/pcm_plug.c:773:(snd_pcm_plug_hw_refine_schange) to find an usable access for 'plughw:0,0,0' aplay: ../../aplay/aplay.c: 919: set_params: Assertion `err >= 0' failed. Aborted by signal Aborted...
Though ALSA shows that I have 3 subdevices it doesn't work with plughw:0,0,0..2. What else can I do to iinvestigate the problem?
Also that would be great if I can optionally play the same stream on all the outputs.
You'll need to define a PCM with multi plugin.
Takashi
At Mon, 21 Apr 2008 10:45:51 +0300, Ihar Hrachyshka wrote:
On Thu, Apr 17, 2008 at 2:57 PM, Takashi Iwai tiwai@suse.de wrote:
At Thu, 17 Apr 2008 10:27:59 +0000,
Ihar Hrachyshka wrote:
Hello! I build my BF533-EZKIT-based board (Blackfin processor development board) sound system on AD1386A sound. I use blackfin.uclinux.org distribution for it. One of my board's function is to play three different stereo sound streams simultaneously on it. What I done is choosing for AD1386 '3 stereos' option. After loading the kernel, my software is able to open pcm 3 times and plays sound properly, with no glitches or smth. The only missed functionality is that I can't specify the needed subdevice I want to play a stream on. I should have the possibility to play, f.e., mplayer stream on the 3rd stereo output while the 1st and the 2nd are not used. How can I do it?
You can pass three numbers to PCM arguments: card, device and subdevice. For example, the below will choose card = 0, device = 2, subdevice = 1, i.e. the secondary substream: % aplay -Dplughw:0,2,1
That's what I've done:
# arecord -c 2 -f dat -d 30 a.wav # aplay -Dplughw:0,0,0 a.wav ALSA sound/blackfin/ad1836.c:924: snd_ad1836_playback_open Playing WAVE 'aAwLvS A isnodu1n di/ biltaecEkdfai,nR/ta d8108 3z6 .tcr:o1
046: snd_ad1836_hw_free ALSA lib ../../../alsa-lib-1.0.12-svn-rev6478/src/pcm/pcm_plug.c:773:(snd_pcm_plug_hw_refine_schange) find an usable access for 'plughw:0,0,0' aplay: set_params:904: Sample format non available
The problem seems different. I guess you can't run with 'plughw:0' as well? According to the message, the sample format isn't available although wrapped with plug layer. Did you install all alsa-lib plugins properly? If you don't pass any configure options, all plugins should be built.
Takashi
# arecord -c 2 -f S32_LE -d 30 a.wav # aplay -Dplughw:0,0,0 a.wav ALSA sound/blackfin/ad1836.c:924: snd_ad1836_playback_open Playing WAVEA'L.SaA' :sSoguen d2/bbtlLatclk fniinn/ aade18803 6z. ct:r1o0
46: snd_ad1836_hw_free ALSA lib ../../../alsa-lib-1.0.12-svn-rev6478/src/pcm/pcm_plug.c:773:(snd_pcm_plug_hw_refine_schange) to find an usable access for 'plughw:0,0,0' aplay: ../../aplay/aplay.c: 919: set_params: Assertion `err >= 0' failed. Aborted by signal Aborted...
Though ALSA shows that I have 3 subdevices it doesn't work with plughw:0,0,0..2. What else can I do to iinvestigate the problem?
Also that would be great if I can optionally play the same stream on all the outputs.
You'll need to define a PCM with multi plugin.
Takashi
Alsa-devel mailing list Alsa-devel@alsa-project.org http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
participants (2)
-
Ihar Hrachyshka -
Takashi Iwai