Open Sound System

by **davemar** » Mon Jul 04, 2011 2:04 pm

I'm trying to get my LynxTwo card to play out multichannel audio (5.1) using portaudio based programs. Portaudio lists the available devices as /dev/dsp, /dev/dsp1, /dev/dsp2, ... and so on, with either 2 outputs or 0 outputs. I was under the impression /dev/dsp8 should be a multichannel (8) output, but it is just listed as 0 outputs. Is there anyway I can either get /dev/dsp8 to actually show up a 8 channel output, or do something clever with vmixctl?

Thanks,
Dave.

by **igorzwx** » Mon Jul 04, 2011 2:46 pm

davemar wrote:I'm trying to get my LynxTwo card to play out multichannel audio (5.1) using portaudio based programs. Portaudio lists the available devices as /dev/dsp, /dev/dsp1, /dev/dsp2, ... and so on, with either 2 outputs or 0 outputs. I was under the impression /dev/dsp8 should be a multichannel (8) output, but it is just listed as 0 outputs. Is there anyway I can either get /dev/dsp8 to actually show up a 8 channel output, or do something clever with vmixctl?

Thanks,
Dave.

You may try DeadBeef player http://deadbeef.sourceforge.net/
They told that they need OSS4 testers.

deadbeef-git
http://aur.archlinux.org/packages.php?ID=29502

Code: Select all: $ yaourt deadbeef-git 1 aur/deadbeef-git 20101022-1 (78) mp3/ogg/flac/ape/sid/mod/nsf/m4a/mpc/shn music player based on GTK2 with translations ==> Enter n° of packages to be installed (ex: 1 2 3 or 1-3) ==> ------------------------------------------------------- ==>

Code: Select all: ./autogen.sh ./configure --prefix=/usr --disable-alsa --disable-pulse make make DESTDIR=$pkgdir install

by **cesium** » Mon Jul 04, 2011 2:58 pm

Can you paste 'ossinfo -v3' output?

by **davemar** » Tue Jul 05, 2011 12:46 pm

It's a bit of a monster. Here goes:

Code: Select all: Version info: OSS 4.2 (b 2004/201101052230) (0x00040100) TRIAL Platform: Linux/x86_64 2.6.32-32-generic #62-Ubuntu SMP Wed Apr 20 21:52:38 UTC 2011 (rd00055) Number of audio devices: 27 Number of audio engines: 31 Number of MIDI devices: 0 Number of mixer devices: 4 Device objects 0: osscore0 OSS core services 1: lynxtwo0 LynxTWO-B interrupts=2502 (6504) Firmware revision: 13 PCB Revision 1 2: oss_hdaudio0 Intel HD Audio interrupts=1600 (14504) HD Audio controller Intel HD Audio Vendor ID 0x80863a3e Subvendor ID 0x17aa1022 Codec 2: AD1988A (0x11d41988/0x17aa1022) 3: oss_usb0 USB audio core services MIDI devices (/dev/midi*) Mixer devices 0: LynxTWO-B Adapter (Mixer 0 of device object 1) Device file /dev/oss/lynxtwo0/mix0, Legacy device /dev/mixer0 Priority: -2 Caps: Device handle: PCI00211621-0000:06:0d.0-mx01 Device priority: -2 1: LynxTWO-B Record/Play (Mixer 1 of device object 1) Device file /dev/oss/lynxtwo0/mix1, Legacy device /dev/mixer1 Priority: -2 Caps: LAYOUT_B NARROW Device handle: PCI00211621-0000:06:0d.0-mx02 Device priority: -2 2: LynxTWO-B Outputs (Mixer 2 of device object 1) Device file /dev/oss/lynxtwo0/mix2, Legacy device /dev/mixer2 Priority: -2 Caps: LAYOUT_B NARROW Device handle: PCI00211621-0000:06:0d.0-mx03 Device priority: -2 3: High Definition Audio AD1988A (Mixer 0 of device object 2) Device file /dev/oss/oss_hdaudio0/mix0, Legacy device /dev/mixer3 Priority: 10 Caps: Device handle: PCI102217aa-0000:00:1b.0-mx01 Device priority: 10 Audio devices LynxTWO-B Play 1 /dev/oss/lynxtwo0/pcm0 (device index 0) Legacy device /dev/dsp0 Caps: TRIGGER MMAP Modes: OUTPUT Out engine 1: 0/LynxTWO-B Play 1 Available for use Input formats (0x00001050): AFMT_S16_LE - 16 bit signed little endian AFMT_S8 - 8 bit signed AFMT_S32_LE - 32 bit signed little endian Output formats (0x00001050): AFMT_S16_LE - 16 bit signed little endian AFMT_S8 - 8 bit signed AFMT_S32_LE - 32 bit signed little endian Device handle: PCI00211621-0000:06:0d.0-au01 Related mixer dev: -1 Sample rate source: 0 Preferred channel configuration: Not indicated Supported number of channels (min - max): 1 - 2 Native sample rates (min - max): 8000 - 200000 (8000,11025,16000,22050,32000,44100,48000,64000,88200,96000,128000,176400,192000,200000) HW Type: Not indicated. Minimum latency: Not indicated LynxTWO-B Play 2 /dev/oss/lynxtwo0/pcm1 (device index 1) Legacy device /dev/dsp1 Caps: TRIGGER MMAP Modes: OUTPUT Out engine 1: 1/LynxTWO-B Play 2 Available for use Input formats (0x00001050): AFMT_S16_LE - 16 bit signed little endian AFMT_S8 - 8 bit signed AFMT_S32_LE - 32 bit signed little endian Output formats (0x00001050): AFMT_S16_LE - 16 bit signed little endian AFMT_S8 - 8 bit signed AFMT_S32_LE - 32 bit signed little endian Device handle: PCI00211621-0000:06:0d.0-au02 Related mixer dev: -1 Sample rate source: 0 Preferred channel configuration: Not indicated Supported number of channels (min - max): 1 - 2 Native sample rates (min - max): 8000 - 200000 (8000,11025,16000,22050,32000,44100,48000,64000,88200,96000,128000,176400,192000,200000) HW Type: Not indicated. Minimum latency: Not indicated LynxTWO-B Play 3 /dev/oss/lynxtwo0/pcm2 (device index 2) Legacy device /dev/dsp2 Caps: TRIGGER MMAP Modes: OUTPUT Out engine 1: 2/LynxTWO-B Play 3 Available for use Input formats (0x00001050): AFMT_S16_LE - 16 bit signed little endian AFMT_S8 - 8 bit signed AFMT_S32_LE - 32 bit signed little endian Output formats (0x00001050): AFMT_S16_LE - 16 bit signed little endian AFMT_S8 - 8 bit signed AFMT_S32_LE - 32 bit signed little endian Device handle: PCI00211621-0000:06:0d.0-au03 Related mixer dev: -1 Sample rate source: 0 Preferred channel configuration: Not indicated Supported number of channels (min - max): 1 - 2 Native sample rates (min - max): 8000 - 200000 (8000,11025,16000,22050,32000,44100,48000,64000,88200,96000,128000,176400,192000,200000) HW Type: Not indicated. Minimum latency: Not indicated LynxTWO-B Play 4 /dev/oss/lynxtwo0/pcm3 (device index 3) Legacy device /dev/dsp3 Caps: TRIGGER MMAP Modes: OUTPUT Out engine 1: 3/LynxTWO-B Play 4 Available for use Input formats (0x00001050): AFMT_S16_LE - 16 bit signed little endian AFMT_S8 - 8 bit signed AFMT_S32_LE - 32 bit signed little endian Output formats (0x00001050): AFMT_S16_LE - 16 bit signed little endian AFMT_S8 - 8 bit signed AFMT_S32_LE - 32 bit signed little endian Device handle: PCI00211621-0000:06:0d.0-au04 Related mixer dev: -1 Sample rate source: 0 Preferred channel configuration: Not indicated Supported number of channels (min - max): 1 - 2 Native sample rates (min - max): 8000 - 200000 (8000,11025,16000,22050,32000,44100,48000,64000,88200,96000,128000,176400,192000,200000) HW Type: Not indicated. Minimum latency: Not indicated LynxTWO-B Play 5 /dev/oss/lynxtwo0/pcm4 (device index 4) Legacy device /dev/dsp4 Caps: TRIGGER MMAP Modes: OUTPUT Out engine 1: 4/LynxTWO-B Play 5 Available for use Input formats (0x00001050): AFMT_S16_LE - 16 bit signed little endian AFMT_S8 - 8 bit signed AFMT_S32_LE - 32 bit signed little endian Output formats (0x00001050): AFMT_S16_LE - 16 bit signed little endian AFMT_S8 - 8 bit signed AFMT_S32_LE - 32 bit signed little endian Device handle: PCI00211621-0000:06:0d.0-au05 Related mixer dev: -1 Sample rate source: 0 Preferred channel configuration: Not indicated Supported number of channels (min - max): 1 - 2 Native sample rates (min - max): 8000 - 200000 (8000,11025,16000,22050,32000,44100,48000,64000,88200,96000,128000,176400,192000,200000) HW Type: Not indicated. Minimum latency: Not indicated LynxTWO-B Play 6 /dev/oss/lynxtwo0/pcm5 (device index 5) Legacy device /dev/dsp5 Caps: TRIGGER MMAP Modes: OUTPUT Out engine 1: 5/LynxTWO-B Play 6 Available for use Input formats (0x00001050): AFMT_S16_LE - 16 bit signed little endian AFMT_S8 - 8 bit signed AFMT_S32_LE - 32 bit signed little endian Output formats (0x00001050): AFMT_S16_LE - 16 bit signed little endian AFMT_S8 - 8 bit signed AFMT_S32_LE - 32 bit signed little endian Device handle: PCI00211621-0000:06:0d.0-au06 Related mixer dev: -1 Sample rate source: 0 Preferred channel configuration: Not indicated Supported number of channels (min - max): 1 - 2 Native sample rates (min - max): 8000 - 200000 (8000,11025,16000,22050,32000,44100,48000,64000,88200,96000,128000,176400,192000,200000) HW Type: Not indicated. Minimum latency: Not indicated LynxTWO-B Play 7 /dev/oss/lynxtwo0/pcm6 (device index 6) Legacy device /dev/dsp6 Caps: TRIGGER MMAP Modes: OUTPUT Out engine 1: 6/LynxTWO-B Play 7 Available for use Input formats (0x00001050): AFMT_S16_LE - 16 bit signed little endian AFMT_S8 - 8 bit signed AFMT_S32_LE - 32 bit signed little endian Output formats (0x00001050): AFMT_S16_LE - 16 bit signed little endian AFMT_S8 - 8 bit signed AFMT_S32_LE - 32 bit signed little endian Device handle: PCI00211621-0000:06:0d.0-au07 Related mixer dev: -1 Sample rate source: 0 Preferred channel configuration: Not indicated Supported number of channels (min - max): 1 - 2 Native sample rates (min - max): 8000 - 200000 (8000,11025,16000,22050,32000,44100,48000,64000,88200,96000,128000,176400,192000,200000) HW Type: Not indicated. Minimum latency: Not indicated LynxTWO-B Play 8 /dev/oss/lynxtwo0/pcm7 (device index 7) Legacy device /dev/dsp7 Caps: TRIGGER MMAP Modes: OUTPUT Out engine 1: 7/LynxTWO-B Play 8 Available for use Input formats (0x00001050): AFMT_S16_LE - 16 bit signed little endian AFMT_S8 - 8 bit signed AFMT_S32_LE - 32 bit signed little endian Output formats (0x00001050): AFMT_S16_LE - 16 bit signed little endian AFMT_S8 - 8 bit signed AFMT_S32_LE - 32 bit signed little endian Device handle: PCI00211621-0000:06:0d.0-au08 Related mixer dev: -1 Sample rate source: 0 Preferred channel configuration: Not indicated Supported number of channels (min - max): 1 - 2 Native sample rates (min - max): 8000 - 200000 (8000,11025,16000,22050,32000,44100,48000,64000,88200,96000,128000,176400,192000,200000) HW Type: Not indicated. Minimum latency: Not indicated LynxTWO-B Record 1 /dev/oss/lynxtwo0/pcmin0 (device index 8) Legacy device /dev/dsp8 Caps: TRIGGER MMAP Modes: INPUT In engine 1: 8/LynxTWO-B Record 1 Available for use Input formats (0x00001050): AFMT_S16_LE - 16 bit signed little endian AFMT_S8 - 8 bit signed AFMT_S32_LE - 32 bit signed little endian Output formats (0x00001050): AFMT_S16_LE - 16 bit signed little endian AFMT_S8 - 8 bit signed AFMT_S32_LE - 32 bit signed little endian Device handle: PCI00211621-0000:06:0d.0-au09 Related mixer dev: -1 Sample rate source: 0 Preferred channel configuration: Not indicated Supported number of channels (min - max): 1 - 2 Native sample rates (min - max): 8000 - 200000 (8000,11025,16000,22050,32000,44100,48000,64000,88200,96000,128000,176400,192000,200000) HW Type: Not indicated. Minimum latency: Not indicated LynxTWO-B Record 2 /dev/oss/lynxtwo0/pcmin1 (device index 9) Legacy device /dev/dsp9 Caps: TRIGGER MMAP Modes: INPUT In engine 1: 9/LynxTWO-B Record 2 Available for use Input formats (0x00001050): AFMT_S16_LE - 16 bit signed little endian AFMT_S8 - 8 bit signed AFMT_S32_LE - 32 bit signed little endian Output formats (0x00001050): AFMT_S16_LE - 16 bit signed little endian AFMT_S8 - 8 bit signed AFMT_S32_LE - 32 bit signed little endian Device handle: PCI00211621-0000:06:0d.0-au10 Related mixer dev: -1 Sample rate source: 0 Preferred channel configuration: Not indicated Supported number of channels (min - max): 1 - 2 Native sample rates (min - max): 8000 - 200000 (8000,11025,16000,22050,32000,44100,48000,64000,88200,96000,128000,176400,192000,200000) HW Type: Not indicated. Minimum latency: Not indicated LynxTWO-B Record 3 /dev/oss/lynxtwo0/pcmin2 (device index 10) Legacy device /dev/dsp10 Caps: TRIGGER MMAP Modes: INPUT In engine 1: 10/LynxTWO-B Record 3 Available for use Input formats (0x00001050): AFMT_S16_LE - 16 bit signed little endian AFMT_S8 - 8 bit signed AFMT_S32_LE - 32 bit signed little endian Output formats (0x00001050): AFMT_S16_LE - 16 bit signed little endian AFMT_S8 - 8 bit signed AFMT_S32_LE - 32 bit signed little endian Device handle: PCI00211621-0000:06:0d.0-au11 Related mixer dev: -1 Sample rate source: 0 Preferred channel configuration: Not indicated Supported number of channels (min - max): 1 - 2 Native sample rates (min - max): 8000 - 200000 (8000,11025,16000,22050,32000,44100,48000,64000,88200,96000,128000,176400,192000,200000) HW Type: Not indicated. Minimum latency: Not indicated LynxTWO-B Record 4 /dev/oss/lynxtwo0/pcmin3 (device index 11) Legacy device /dev/dsp11 Caps: TRIGGER MMAP Modes: INPUT In engine 1: 11/LynxTWO-B Record 4 Available for use Input formats (0x00001050): AFMT_S16_LE - 16 bit signed little endian AFMT_S8 - 8 bit signed AFMT_S32_LE - 32 bit signed little endian Output formats (0x00001050): AFMT_S16_LE - 16 bit signed little endian AFMT_S8 - 8 bit signed AFMT_S32_LE - 32 bit signed little endian Device handle: PCI00211621-0000:06:0d.0-au12 Related mixer dev: -1 Sample rate source: 0 Preferred channel configuration: Not indicated Supported number of channels (min - max): 1 - 2 Native sample rates (min - max): 8000 - 200000 (8000,11025,16000,22050,32000,44100,48000,64000,88200,96000,128000,176400,192000,200000) HW Type: Not indicated. Minimum latency: Not indicated LynxTWO-B Record 5 /dev/oss/lynxtwo0/pcmin4 (device index 12) Legacy device /dev/dsp12 Caps: TRIGGER MMAP Modes: INPUT In engine 1: 12/LynxTWO-B Record 5 Available for use Input formats (0x00001050): AFMT_S16_LE - 16 bit signed little endian AFMT_S8 - 8 bit signed AFMT_S32_LE - 32 bit signed little endian Output formats (0x00001050): AFMT_S16_LE - 16 bit signed little endian AFMT_S8 - 8 bit signed AFMT_S32_LE - 32 bit signed little endian Device handle: PCI00211621-0000:06:0d.0-au13 Related mixer dev: -1 Sample rate source: 0 Preferred channel configuration: Not indicated Supported number of channels (min - max): 1 - 2 Native sample rates (min - max): 8000 - 200000 (8000,11025,16000,22050,32000,44100,48000,64000,88200,96000,128000,176400,192000,200000) HW Type: Not indicated. Minimum latency: Not indicated LynxTWO-B Record 6 /dev/oss/lynxtwo0/pcmin5 (device index 13) Legacy device /dev/dsp13 Caps: TRIGGER MMAP Modes: INPUT In engine 1: 13/LynxTWO-B Record 6 Available for use Input formats (0x00001050): AFMT_S16_LE - 16 bit signed little endian AFMT_S8 - 8 bit signed AFMT_S32_LE - 32 bit signed little endian Output formats (0x00001050): AFMT_S16_LE - 16 bit signed little endian AFMT_S8 - 8 bit signed AFMT_S32_LE - 32 bit signed little endian Device handle: PCI00211621-0000:06:0d.0-au14 Related mixer dev: -1 Sample rate source: 0 Preferred channel configuration: Not indicated Supported number of channels (min - max): 1 - 2 Native sample rates (min - max): 8000 - 200000 (8000,11025,16000,22050,32000,44100,48000,64000,88200,96000,128000,176400,192000,200000) HW Type: Not indicated. Minimum latency: Not indicated LynxTWO-B Record 7 /dev/oss/lynxtwo0/pcmin6 (device index 14) Legacy device /dev/dsp14 Caps: TRIGGER MMAP Modes: INPUT In engine 1: 14/LynxTWO-B Record 7 Available for use Input formats (0x00001050): AFMT_S16_LE - 16 bit signed little endian AFMT_S8 - 8 bit signed AFMT_S32_LE - 32 bit signed little endian Output formats (0x00001050): AFMT_S16_LE - 16 bit signed little endian AFMT_S8 - 8 bit signed AFMT_S32_LE - 32 bit signed little endian Device handle: PCI00211621-0000:06:0d.0-au15 Related mixer dev: -1 Sample rate source: 0 Preferred channel configuration: Not indicated Supported number of channels (min - max): 1 - 2 Native sample rates (min - max): 8000 - 200000 (8000,11025,16000,22050,32000,44100,48000,64000,88200,96000,128000,176400,192000,200000) HW Type: Not indicated. Minimum latency: Not indicated LynxTWO-B Record 8 /dev/oss/lynxtwo0/pcmin7 (device index 15) Legacy device /dev/dsp15 Caps: TRIGGER MMAP Modes: INPUT In engine 1: 15/LynxTWO-B Record 8 Available for use Input formats (0x00001050): AFMT_S16_LE - 16 bit signed little endian AFMT_S8 - 8 bit signed AFMT_S32_LE - 32 bit signed little endian Output formats (0x00001050): AFMT_S16_LE - 16 bit signed little endian AFMT_S8 - 8 bit signed AFMT_S32_LE - 32 bit signed little endian Device handle: PCI00211621-0000:06:0d.0-au16 Related mixer dev: -1 Sample rate source: 0 Preferred channel configuration: Not indicated Supported number of channels (min - max): 1 - 2 Native sample rates (min - max): 8000 - 200000 (8000,11025,16000,22050,32000,44100,48000,64000,88200,96000,128000,176400,192000,200000) HW Type: Not indicated. Minimum latency: Not indicated LynxTWO-B 7.1 output /dev/oss/lynxtwo0/pcm8 (device index 16) Legacy device /dev/dsp16 Caps: TRIGGER MMAP Modes: OUTPUT Out engine 1: 16/LynxTWO-B 7.1 output Available for use Input formats (0x00000010): AFMT_S16_LE - 16 bit signed little endian Output formats (0x00000010): AFMT_S16_LE - 16 bit signed little endian Device handle: PCI00211621-0000:06:0d.0-au17 Related mixer dev: -1 Sample rate source: 0 Preferred channel configuration: MULTICH Supported number of channels (min - max): 2 - 8 Native sample rates (min - max): 8000 - 200000 HW Type: Not indicated. Minimum latency: Not indicated HD Audio play front /dev/oss/oss_hdaudio0/pcm0 (device index 17) Legacy device /dev/dsp17 Caps: DUPLEX TRIGGER MMAP Modes: IN/OUT Out engine 1: 17/HD Audio play front Available for use Engine 2: 27/HD Audio play front (vmix) Available for use Engine 3: 28/HD Audio play front (vmix) Available for use Engine 4: 29/HD Audio play front (vmix) Available for use Engine 5: 30/HD Audio play front (vmix) Available for use Input formats (0x00001010): AFMT_S16_LE - 16 bit signed little endian AFMT_S32_LE - 32 bit signed little endian Output formats (0x00001010): AFMT_S16_LE - 16 bit signed little endian AFMT_S32_LE - 32 bit signed little endian Device handle: PCI102217aa-0000:00:1b.0-au01 Related mixer dev: 3 Sample rate source: 17 Preferred channel configuration: Not indicated Supported number of channels (min - max): 2 - 8 Native sample rates (min - max): 8000 - 192000 (8000,11025,16000,22050,32000,44100,48000,88200,96000,176400,192000) HW Type: Not indicated. Minimum latency: Not indicated HD Audio play center/LFE /dev/oss/oss_hdaudio0/pcm1 (device index 18) Legacy device /dev/dsp18 Caps: TRIGGER MMAP Modes: OUTPUT Out engine 1: 18/HD Audio play center/LFE Available for use Input formats (0x00001010): AFMT_S16_LE - 16 bit signed little endian AFMT_S32_LE - 32 bit signed little endian Output formats (0x00001010): AFMT_S16_LE - 16 bit signed little endian AFMT_S32_LE - 32 bit signed little endian Device handle: PCI102217aa-0000:00:1b.0-au02 Related mixer dev: 3 Sample rate source: 17 Preferred channel configuration: Not indicated Supported number of channels (min - max): 2 - 2 Native sample rates (min - max): 8000 - 192000 (8000,11025,16000,22050,32000,44100,48000,88200,96000,176400,192000) HW Type: Not indicated. Minimum latency: Not indicated HD Audio play rear /dev/oss/oss_hdaudio0/pcm2 (device index 19) Legacy device /dev/dsp19 Caps: TRIGGER MMAP Modes: OUTPUT Out engine 1: 19/HD Audio play rear Available for use Input formats (0x00001010): AFMT_S16_LE - 16 bit signed little endian AFMT_S32_LE - 32 bit signed little endian Output formats (0x00001010): AFMT_S16_LE - 16 bit signed little endian AFMT_S32_LE - 32 bit signed little endian Device handle: PCI102217aa-0000:00:1b.0-au03 Related mixer dev: 3 Sample rate source: 17 Preferred channel configuration: Not indicated Supported number of channels (min - max): 2 - 2 Native sample rates (min - max): 8000 - 192000 (8000,11025,16000,22050,32000,44100,48000,88200,96000,176400,192000) HW Type: Not indicated. Minimum latency: Not indicated HD Audio play side /dev/oss/oss_hdaudio0/pcm3 (device index 20) Legacy device /dev/dsp20 Caps: TRIGGER MMAP Modes: OUTPUT Out engine 1: 20/HD Audio play side Available for use Input formats (0x00001010): AFMT_S16_LE - 16 bit signed little endian AFMT_S32_LE - 32 bit signed little endian Output formats (0x00001010): AFMT_S16_LE - 16 bit signed little endian AFMT_S32_LE - 32 bit signed little endian Device handle: PCI102217aa-0000:00:1b.0-au04 Related mixer dev: 3 Sample rate source: 17 Preferred channel configuration: Not indicated Supported number of channels (min - max): 2 - 2 Native sample rates (min - max): 8000 - 192000 (8000,11025,16000,22050,32000,44100,48000,88200,96000,176400,192000) HW Type: Not indicated. Minimum latency: Not indicated HD Audio play headphone /dev/oss/oss_hdaudio0/pcm4 (device index 21) Legacy device /dev/dsp21 Caps: TRIGGER MMAP Modes: OUTPUT Out engine 1: 21/HD Audio play headphone Available for use Input formats (0x00001010): AFMT_S16_LE - 16 bit signed little endian AFMT_S32_LE - 32 bit signed little endian Output formats (0x00001010): AFMT_S16_LE - 16 bit signed little endian AFMT_S32_LE - 32 bit signed little endian Device handle: PCI102217aa-0000:00:1b.0-au05 Related mixer dev: 3 Sample rate source: 17 Preferred channel configuration: Not indicated Supported number of channels (min - max): 2 - 2 Native sample rates (min - max): 8000 - 192000 (8000,11025,16000,22050,32000,44100,48000,88200,96000,176400,192000) HW Type: Not indicated. Minimum latency: Not indicated HD Audio play spdifout-mix /dev/oss/oss_hdaudio0/spdout0 (device index 22) Legacy device /dev/dsp22 Caps: TRIGGER MMAP Modes: OUTPUT Out engine 1: 22/HD Audio play spdifout-mix Available for use Input formats (0x00001410): AFMT_S16_LE - 16 bit signed little endian AFMT_AC3 - AC3 (Dolby Digital) encoded audio AFMT_S32_LE - 32 bit signed little endian Output formats (0x00001410): AFMT_S16_LE - 16 bit signed little endian AFMT_AC3 - AC3 (Dolby Digital) encoded audio AFMT_S32_LE - 32 bit signed little endian Device handle: PCI102217aa-0000:00:1b.0-au06 Related mixer dev: 3 Sample rate source: 17 Preferred channel configuration: Not indicated Supported number of channels (min - max): 2 - 2 Native sample rates (min - max): 44100 - 192000 (44100,48000,88200,96000,176400,192000) HW Type: Not indicated. Minimum latency: Not indicated HD Audio rec rec1-src /dev/oss/oss_hdaudio0/pcmin0 (device index 23) Legacy device /dev/dsp23 Caps: DUPLEX TRIGGER MMAP Modes: IN/OUT In engine 1: 23/HD Audio rec rec1-src Available for use Engine 2: 27/HD Audio play front (vmix) Available for use Engine 3: 28/HD Audio play front (vmix) Available for use Engine 4: 29/HD Audio play front (vmix) Available for use Engine 5: 30/HD Audio play front (vmix) Available for use Input formats (0x00001010): AFMT_S16_LE - 16 bit signed little endian AFMT_S32_LE - 32 bit signed little endian Output formats (0x00001010): AFMT_S16_LE - 16 bit signed little endian AFMT_S32_LE - 32 bit signed little endian Device handle: PCI102217aa-0000:00:1b.0-au07 Related mixer dev: 3 Sample rate source: 17 Preferred channel configuration: Not indicated Supported number of channels (min - max): 2 - 2 Native sample rates (min - max): 8000 - 192000 (8000,11025,16000,22050,32000,44100,48000,88200,96000,176400,192000) HW Type: Not indicated. Minimum latency: Not indicated HD Audio rec rec2-src /dev/oss/oss_hdaudio0/pcmin1 (device index 24) Legacy device /dev/dsp24 Caps: TRIGGER MMAP Modes: INPUT In engine 1: 24/HD Audio rec rec2-src Available for use Input formats (0x00001010): AFMT_S16_LE - 16 bit signed little endian AFMT_S32_LE - 32 bit signed little endian Output formats (0x00001010): AFMT_S16_LE - 16 bit signed little endian AFMT_S32_LE - 32 bit signed little endian Device handle: PCI102217aa-0000:00:1b.0-au08 Related mixer dev: 3 Sample rate source: 17 Preferred channel configuration: Not indicated Supported number of channels (min - max): 2 - 2 Native sample rates (min - max): 8000 - 192000 (8000,11025,16000,22050,32000,44100,48000,88200,96000,176400,192000) HW Type: Not indicated. Minimum latency: Not indicated HD Audio rec rec3-src /dev/oss/oss_hdaudio0/pcmin2 (device index 25) Legacy device /dev/dsp25 Caps: TRIGGER MMAP Modes: INPUT In engine 1: 25/HD Audio rec rec3-src Available for use Input formats (0x00001010): AFMT_S16_LE - 16 bit signed little endian AFMT_S32_LE - 32 bit signed little endian Output formats (0x00001010): AFMT_S16_LE - 16 bit signed little endian AFMT_S32_LE - 32 bit signed little endian Device handle: PCI102217aa-0000:00:1b.0-au09 Related mixer dev: 3 Sample rate source: 17 Preferred channel configuration: Not indicated Supported number of channels (min - max): 2 - 2 Native sample rates (min - max): 8000 - 192000 (8000,11025,16000,22050,32000,44100,48000,88200,96000,176400,192000) HW Type: Not indicated. Minimum latency: Not indicated HD Audio rec spdif-in /dev/oss/oss_hdaudio0/spdin0 (device index 26) Legacy device /dev/dsp26 Caps: TRIGGER MMAP Modes: INPUT In engine 1: 26/HD Audio rec spdif-in Available for use Input formats (0x00001410): AFMT_S16_LE - 16 bit signed little endian AFMT_AC3 - AC3 (Dolby Digital) encoded audio AFMT_S32_LE - 32 bit signed little endian Output formats (0x00001410): AFMT_S16_LE - 16 bit signed little endian AFMT_AC3 - AC3 (Dolby Digital) encoded audio AFMT_S32_LE - 32 bit signed little endian Device handle: PCI102217aa-0000:00:1b.0-au10 Related mixer dev: 3 Sample rate source: 17 Preferred channel configuration: Not indicated Supported number of channels (min - max): 2 - 2 Native sample rates (min - max): 44100 - 192000 (44100,48000,88200,96000,176400,192000) HW Type: Not indicated. Minimum latency: Not indicated Nodes /dev/dsp -> /dev/oss/oss_hdaudio0/pcm0 /dev/dsp_in -> /dev/oss/lynxtwo0/pcmin0 /dev/dsp_out -> /dev/oss/lynxtwo0/pcm0 /dev/dsp_ac3 -> /dev/oss/oss_hdaudio0/spdout0 /dev/dsp_mmap -> /dev/oss/lynxtwo0/pcm0 /dev/dsp_multich -> /dev/oss/lynxtwo0/pcm8

by **davemar** » Tue Jul 05, 2011 2:18 pm

My portaudio program also lists all the devices it can find and the number of channels of each one:

Code: Select all: 0) default 32 1) /dev/dsp 2 2) /dev/dsp1 2 3) /dev/dsp2 2 4) /dev/dsp3 2 5) /dev/dsp4 2 6) /dev/dsp5 2 7) /dev/dsp6 2 8) /dev/dsp7 2 9) /dev/dsp8 0 10) /dev/dsp9 0 11) /dev/dsp10 0 12) /dev/dsp11 0 13) /dev/dsp12 0 14) /dev/dsp13 0 15) /dev/dsp14 0 16) /dev/dsp15 0 17) /dev/dsp16 2 18) /dev/dsp17 2 19) /dev/dsp18 2 20) /dev/dsp19 2 21) /dev/dsp20 2 22) /dev/dsp21 2 23) /dev/dsp22 2 24) /dev/dsp23 2 25) /dev/dsp24 2 26) /dev/dsp25 2 27) /dev/dsp26 2

The two faults are that /dev/dsp0 (output channels 1 & 2) is missing, and that /dev/dsp16 is listed as only 2 channels when it should be 8 (it is supposed to be the multichannel device).

I can get stereo sound out of /dev/dsp1, /dev/dsp2 and /dev/dsp3, but when I try anything with /dev/dsp16 (even a 2 channel file) I get this error:

Code: Select all: Expression 'tempDevHandle = open( deviceInfo->name, flags )' failed in 'src/hostapi/oss/pa_unix_oss.c', line: 687 Pa_IsFormatSupported reports device will not support number of channels.

However, doing:

Code: Select all: ossplay -d/dev/dsp16 my_surround_file.wav

does work.

by **cesium** » Tue Jul 05, 2011 3:43 pm

Sounds like a bug in portaudio... You can try to strace the program (strace -e trace=ioctl ...) to see what portaudio does with the card. This patched version of strace is better since it shows the original ioctl argument and the returned result.

by **davemar** » Thu Jul 07, 2011 10:23 am

Here's the output of strace:

Code: Select all: syscall_293(0x7fff78458ce0, 0x80000, 0x7f8fa5ec6e7b, 0x11, 0x7f8fa83df720, 0x7f8fa5ec6025, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0) = 0 --- SIGCHLD (Child exited) @ 0 (0) --- syscall_293(0x7fff78458ce0, 0x80000, 0x7f8fa5ec6e7b, 0x7f8fa6ead0f8, 0x7f8fa83df720, 0x7f8fa5ec6025, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0) = 0 --- SIGCHLD (Child exited) @ 0 (0) --- syscall_293(0x7fff78458f90, 0x80000, 0x7f8fa5ec6e7b, 0x7f8fa6eacfe8, 0x7f8fa83df720, 0x7f8fa5ec6025, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0) = 0 --- SIGCHLD (Child exited) @ 0 (0) --- syscall_293(0x7fff78458f90, 0x80000, 0x7f8fa5ec6e7b, 0x7f8fa6eacfc8, 0x7f8fa83df720, 0x7f8fa5ec6025, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0) = 0 --- SIGCHLD (Child exited) @ 0 (0) --- ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 1 => 1) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 3 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_SPEED or SOUND_PCM_READ_RATE, 44100 => 44100) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 1 => 1) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 3 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 1 => 1) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 3 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_SPEED or SOUND_PCM_READ_RATE, 44100 => 44100) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 1 => 1) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 3 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_SPEED or SOUND_PCM_READ_RATE, 44100 => 44100) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 1 => 1) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 3 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_SPEED or SOUND_PCM_READ_RATE, 44100 => 44100) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 1 => 1) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 3 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_SPEED or SOUND_PCM_READ_RATE, 44100 => 44100) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 1 => 1) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 3 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_SPEED or SOUND_PCM_READ_RATE, 44100 => 44100) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 1 => 1) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 3 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_SPEED or SOUND_PCM_READ_RATE, 44100 => 44100) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 1 => 1) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 3 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_SPEED or SOUND_PCM_READ_RATE, 44100 => 44100) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 1 => 1) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 3 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_SPEED or SOUND_PCM_READ_RATE, 44100 => 44100) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 1 => 1) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 3 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_SPEED or SOUND_PCM_READ_RATE, 44100 => 44100) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 1 => 1) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 3 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_SPEED or SOUND_PCM_READ_RATE, 44100 => 44100) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 1 => 1) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 3 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_SPEED or SOUND_PCM_READ_RATE, 44100 => 44100) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 1 => 1) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 3 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_SPEED or SOUND_PCM_READ_RATE, 44100 => 44100) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 1 => 1) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 3 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_SPEED or SOUND_PCM_READ_RATE, 44100 => 44100) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 1 => 1) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 3 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_SPEED or SOUND_PCM_READ_RATE, 44100 => 44100) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 1 => 1) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 3 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_SPEED or SOUND_PCM_READ_RATE, 44100 => 44100) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 1 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 3 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_SPEED or SOUND_PCM_READ_RATE, 44100 => 44100) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 1 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 3 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 1 => 1) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 3 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_SPEED or SOUND_PCM_READ_RATE, 44100 => 44100) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 1 => 1) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 3 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 1 => 1) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 3 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_SPEED or SOUND_PCM_READ_RATE, 44100 => 44100) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 1 => 1) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 3 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 1 => 1) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 3 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_SPEED or SOUND_PCM_READ_RATE, 44100 => 44100) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 1 => 1) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 3 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 1 => 1) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 3 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_SPEED or SOUND_PCM_READ_RATE, 44100 => 44100) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 1 => 1) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 3 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 1 => 1) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 3 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_SPEED or SOUND_PCM_READ_RATE, 44100 => 44100) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 1 => 1) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 3 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 1 => 1) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 3 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_SPEED or SOUND_PCM_READ_RATE, 44100 => 44100) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 1 => 1) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 3 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 1 => 1) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 3 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_SPEED or SOUND_PCM_READ_RATE, 44100 => 44100) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 1 => 1) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 3 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 1 => 1) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 3 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_SPEED or SOUND_PCM_READ_RATE, 44100 => 44100) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 1 => 1) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 3 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 1 => 1) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 3 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_SPEED or SOUND_PCM_READ_RATE, 44100 => 44100) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 1 => 1) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 3 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 1 => 1) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 3 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_SPEED or SOUND_PCM_READ_RATE, 44100 => 44100) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 1 => 1) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 3 => 2) = 0 ioctl(3, SNDCTL_DSP_CHANNELS or SOUND_PCM_READ_CHANNELS, 2 => 2) = 0 syscall_293(0x7fff784595c0, 0x80000, 0x7f8fa5ec6e7b, 0x11, 0x7f8fa83df720, 0x7f8fa5ec6025, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0) = 0 --- SIGCHLD (Child exited) @ 0 (0) ---

I can't really work out much from this to be honest.

Also, I'm finding the ossplay program doesn't always playback the correct channel order. It is usually correct, but a lot of the time it randomises the order.

So it looks like there's two separate faults to deal with now:
1) OSS drivers channel order stability.
2) Portaudio device identification.

by **igorzwx** » Thu Jul 07, 2011 10:58 am

davemar wrote: I'm finding the ossplay program doesn't always playback the correct channel order. It is usually correct, but a lot of the time it randomises the order.

So it looks like there's two separate faults to deal with now:
1) OSS drivers channel order stability.
2) Portaudio device identification.

Portaudio has always been problematic with OSS4. But ossplay?

Code: Select all: $ man ossplay -R Disable redirection to virtual mixer engines and sample rate/format conversions. Should not be used unless absolutely necessary.

In a word, ALSA can randomise soundcards through the help of UDev. This can be prevented by preloading drivers viewtopic.php?f=3&t=4372#p17360
Perhaps, a kind of "advanced innovation" in OSS4.

You see, "ossplay -R" plays a wave "as is". If it plays a mono wave though a stereo device, you may hear "strange effects".
The notion that "ossplay -R" "should not be used unless absolutely necessary" may surely help to keep the OSS4 users "stupid and ignorant".

Notice that vmixctl is an "Open Sound System utility to control the vmix subsystem". The channels are somehow mapped through the help of vmix

Code: Select all: $ man vmixctl CHANGING THE VMIX CHANNEL MAP The vmix subsystem can remap channels, so that all output sent to a channel via vmix will end up being played on a different channel. The syntax uses a list of channels, where typically 0=default, 1=left, 2=right, 3=center, 4=lfe, 5=left surround, 6=right surround, 7=left rear and 8=right rear. Note that vmix-channels should be set first to Multich if vmix is to recognize the extra channels. EXAMPLES o vmixctl remap /dev/dsp 2 1 #switch left and right o vmixctl remap /dev/dsp 0 0 0 0 6 5 #switch left and right sur‐ round

All these seem to be a kind of "dirty hack", perhaps, an attempt to imitate PulseAudio.
The reason is simple. If some Linux drivers do not support "multi-channel", or "hardware mixing", or "hardware resampling", you can simply create a kind of PulseAudio or "vmix" to imitate "technological progress and innovations". The alternative is to fix drivers - this means a great deal of hard work.

Does ultimate perfection exist?... Today we are testing the Lynx Two sound card from the American company of Lynx Studio Technology. The distinguishing features of this solution are the reference quality of sound and an a high price ($1000 to $1200 depending on the modification). http://ixbtlabs.com/articles2/lynxtwo/

Is it capable of "hardware mixing"? Or it should be powered with a kind of PulseAudio?

Open Sound System

Getting multichannel output on LynxTwo

Getting multichannel output on LynxTwo

Re: Getting multichannel output on LynxTwo

Re: Getting multichannel output on LynxTwo

Re: Getting multichannel output on LynxTwo

Re: Getting multichannel output on LynxTwo

Re: Getting multichannel output on LynxTwo

Re: Getting multichannel output on LynxTwo

Re: Getting multichannel output on LynxTwo

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