> Thanks. To start somewhere, what type of playback/recording do you want > to work? As in, what sample format, what number of channels etc? I apologize but currently I have no better answer for this question. (It's an evidence that I'm a newbie for this project...) Let me describe about devices which the drivers enable: - S32 for capture, S16/S32 for playback - its range of the number of channels for playback/capture is between 2 to 34 (depending on devices) - some devices change its number of channels at the same sampling rate according to settings - Playback stream don't always go to fixed output port because the devices have rich internal mixer. The device are not designed as a standard sound devices with 2/3.1/4/4.1/5/5.1/7.1 positions. The devices are designed for studio use. Currently I load module-alsa-sink/module-alsa-source in my hand and check PulseAudio can use the devices. For example, this device has 16ch for capture and 12ch for playback at 44.1kHz: ###### $ pactl list sources ... Source #3 State: RUNNING Name: alsa_input.hw_1_0 Description: Motherboard Driver: module-alsa-source.c Sample Specification: s32le 16ch 44100Hz Channel Map: front-left,front-right,rear-left,rear-right,front-center,lfe,side-left,side-right,aux0,aux1,aux2,aux3,aux4,aux5,aux6,aux7 Owner Module: 27 Mute: no Volume: 0: 100% 1: 100% 2: 100% 3: 100% 4: 100% 5: 100% 6: 100% 7: 100% 8: 100% 9: 100% 10: 100% 11: 100% 12: 100% 13: 100% 14: 100% 15: 100% 0: -0.00 dB 1: -0.00 dB 2: -0.00 dB 3: -0.00 dB 4: -0.00 dB 5: -0.00 dB 6: -0.00 dB 7: -0.00 dB 8: -0.00 dB 9: -0.00 dB 10: -0.00 dB 11: -0.00 dB 12: -0.00 dB 13: -0.00 dB 14: -0.00 dB 15: -0.00 dB balance 0.00 Base Volume: 100% 0.00 dB Monitor of Sink: n/a Latency: 1448 usec, configured 20000 usec Flags: HARDWARE DECIBEL_VOLUME LATENCY Properties: alsa.resolution_bits = "24" device.api = "alsa" device.class = "sound" alsa.class = "generic" alsa.subclass = "generic-mix" alsa.name = "FW 1814 PCM" alsa.id = "BeBoB" alsa.subdevice = "0" alsa.subdevice_name = "subdevice #0" alsa.device = "0" alsa.card = "1" alsa.card_name = "FW 1814" alsa.long_card_name = "M-AUDIO FW 1814 (id:131, rev:1), GUID 000d6c04007feef8 at fw1.0, S400" alsa.driver_name = "snd_bebob" device.bus_path = "pci-0000:0c:06.0" sysfs.path = "/devices/pci0000:00/0000:00:1e.0/0000:0c:06.0/fw1/fw1.0/sound/card1" udev.id = "firewire-0x000d6c04007feef8" device.bus = "firewire" device.vendor.name = "Texas Instruments" device.product.name = "Motherboard" device.string = "hw:1,0" device.buffering.buffer_size = "5644800" device.buffering.fragment_size = "2822400" device.access_mode = "mmap+timer" device.description = "Motherboard" device.icon_name = "audio-input-microphone-firewire" Formats: pcm $ pactl list sinks Sink #1 State: IDLE Name: alsa_output.hw_1_0 Description: Motherboard Driver: module-alsa-sink.c Sample Specification: s16le 12ch 44100Hz Channel Map: front-left,front-right,rear-left,rear-right,front-center,lfe,side-left,side-right,aux0,aux1,aux2,aux3 Owner Module: 26 Mute: no Volume: 0: 100% 1: 100% 2: 100% 3: 100% 4: 100% 5: 100% 6: 100% 7: 100% 8: 100% 9: 100% 10: 100% 11: 100% 0: 0.00 dB 1: 0.00 dB 2: 0.00 dB 3: 0.00 dB 4: 0.00 dB 5: 0.00 dB 6: 0.00 dB 7: 0.00 dB 8: 0.00 dB 9: 0.00 dB 10: 0.00 dB 11: 0.00 dB balance 0.00 Base Volume: 100% 0.00 dB Monitor Source: alsa_output.hw_1_0.monitor Latency: 20078 usec, configured 20000 usec Flags: HARDWARE DECIBEL_VOLUME LATENCY Properties: alsa.resolution_bits = "16" device.api = "alsa" device.class = "sound" alsa.class = "generic" alsa.subclass = "generic-mix" alsa.name = "FW 1814 PCM" alsa.id = "BeBoB" alsa.subdevice = "0" alsa.subdevice_name = "subdevice #0" alsa.device = "0" alsa.card = "1" alsa.card_name = "FW 1814" alsa.long_card_name = "M-AUDIO FW 1814 (id:131, rev:1), GUID 000d6c04007feef8 at fw1.0, S400" alsa.driver_name = "snd_bebob" device.bus_path = "pci-0000:0c:06.0" sysfs.path = "/devices/pci0000:00/0000:00:1e.0/0000:0c:06.0/fw1/fw1.0/sound/card1" udev.id = "firewire-0x000d6c04007feef8" device.bus = "firewire" device.vendor.name = "Texas Instruments" device.product.name = "Motherboard" device.string = "hw:1,0" device.buffering.buffer_size = "2116800" device.buffering.fragment_size = "1058400" device.access_mode = "mmap+timer" device.description = "Motherboard" device.icon_name = "audio-card-firewire" Formats: pcm ###### I must consider about how PulseAudio handle these devices but I have a little knowledgement about PulseAudio. So I need your help. Thanks Takashi Sakamoto
