Re: [Alsa-user] Hardware loopback
Hi, 2014-01-16 12:04 GMT+04:00 Clemens Ladisch : > Denis Shulyaka wrote: > > 2014/1/14 Clemens Ladisch : > >> This device's descriptor do not define a mixer control > >> for this control. > >> > >> Apparently, you have to set the SPDIFMIX bit. > > > > Well, do you have any idea on how can I do it? I'm OK with compiling a > > custom kernel, but I don't have any experience with ALSA code. Just a > > small hint would be appreciated) Can I somehow define it in the > > descriptor? > > This is not a mixer control that could be described with a descriptor; > one needs to write a custom control that writes to that vendor-specific > register. > > I'll write a patch ... > > > Regards, > Clemens > Well, I've finally managed to set the SPDIFMIX bit in by modifying the snd_usb_cm6206_boot_quirk() function. However it led me to another problem: PCM streams are played fine and are routed to the analog speakers without CPU interaction, but DTS streams sound like a loud noise. Do I understand it right that the card hardware is not able to decode DTS itself and it merely relies on a proprietary software driver for DTS support? Can Alsa and PulseAudio deal with DTS? I just need to get the idea what DTS is... Best regards, Denis Shulyaka -- Open source business process management suite built on Java and Eclipse Turn processes into business applications with Bonita BPM Community Edition Quickly connect people, data, and systems into organized workflows Winner of BOSSIE, CODIE, OW2 and Gartner awards http://p.sf.net/sfu/Bonitasoft___ Alsa-user mailing list Alsa-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/alsa-user
Re: [Alsa-user] Hardware loopback
Denis Shulyaka wrote: > 2014/1/14 Clemens Ladisch : >> This device's descriptor do not define a mixer control >> for this control. >> >> Apparently, you have to set the SPDIFMIX bit. > > Well, do you have any idea on how can I do it? I'm OK with compiling a > custom kernel, but I don't have any experience with ALSA code. Just a > small hint would be appreciated) Can I somehow define it in the > descriptor? This is not a mixer control that could be described with a descriptor; one needs to write a custom control that writes to that vendor-specific register. I'll write a patch ... Regards, Clemens -- CenturyLink Cloud: The Leader in Enterprise Cloud Services. Learn Why More Businesses Are Choosing CenturyLink Cloud For Critical Workloads, Development Environments & Everything In Between. Get a Quote or Start a Free Trial Today. http://pubads.g.doubleclick.net/gampad/clk?id=119420431&iu=/4140/ostg.clktrk ___ Alsa-user mailing list Alsa-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/alsa-user
Re: [Alsa-user] Hardware loopback
Hi, 2014/1/14 Clemens Ladisch : > This device's descriptor do not define a mixer control > for this control. > > Apparently, you have to set the SPDIFMIX bit. Well, do you have any idea on how can I do it? I'm OK with compiling a custom kernel, but I don't have any experience with ALSA code. Just a small hint would be appreciated) Can I somehow define it in the descriptor? Best regards, Denis Shulyaka -- CenturyLink Cloud: The Leader in Enterprise Cloud Services. Learn Why More Businesses Are Choosing CenturyLink Cloud For Critical Workloads, Development Environments & Everything In Between. Get a Quote or Start a Free Trial Today. http://pubads.g.doubleclick.net/gampad/clk?id=119420431&iu=/4140/ostg.clktrk ___ Alsa-user mailing list Alsa-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/alsa-user
Re: [Alsa-user] Hardware loopback
Denis Shulyaka wrote: > 2014/1/14 Clemens Ladisch : >> What is the output of "lsusb -v" for this device? > > The output is below, also sending it as an attachment. This device's descriptor do not define a mixer control for this control. Apparently, you have to set the SPDIFMIX bit. Regards, Clemens -- CenturyLink Cloud: The Leader in Enterprise Cloud Services. Learn Why More Businesses Are Choosing CenturyLink Cloud For Critical Workloads, Development Environments & Everything In Between. Get a Quote or Start a Free Trial Today. http://pubads.g.doubleclick.net/gampad/clk?id=119420431&iu=/4140/ostg.clktrk ___ Alsa-user mailing list Alsa-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/alsa-user
Re: [Alsa-user] Hardware loopback
Hi, 2014/1/14 Clemens Ladisch : > What is the output of "lsusb -v" for this device? The output is below, also sending it as an attachment. pi@speaker ~ $ sudo lsusb -v -s 001:006 Bus 001 Device 006: ID 0d8c:0102 C-Media Electronics, Inc. CM106 Like Sound Device Device Descriptor: bLength18 bDescriptorType 1 bcdUSB 1.10 bDeviceClass0 (Defined at Interface level) bDeviceSubClass 0 bDeviceProtocol 0 bMaxPacketSize0 8 idVendor 0x0d8c C-Media Electronics, Inc. idProduct 0x0102 CM106 Like Sound Device bcdDevice0.10 iManufacturer 0 iProduct2 USB Sound Device iSerial 0 bNumConfigurations 1 Configuration Descriptor: bLength 9 bDescriptorType 2 wTotalLength 534 bNumInterfaces 4 bConfigurationValue 1 iConfiguration 0 bmAttributes 0x80 (Bus Powered) MaxPower 500mA Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber0 bAlternateSetting 0 bNumEndpoints 0 bInterfaceClass 1 Audio bInterfaceSubClass 1 Control Device bInterfaceProtocol 0 iInterface 0 AudioControl Interface Descriptor: bLength10 bDescriptorType36 bDescriptorSubtype 1 (HEADER) bcdADC 1.00 wTotalLength 200 bInCollection 2 baInterfaceNr( 0) 1 baInterfaceNr( 1) 2 AudioControl Interface Descriptor: bLength12 bDescriptorType36 bDescriptorSubtype 2 (INPUT_TERMINAL) bTerminalID 1 wTerminalType 0x0101 USB Streaming bAssocTerminal 0 bNrChannels 8 wChannelConfig 0x063f Left Front (L) Right Front (R) Center Front (C) Low Freqency Enhancement (LFE) Left Surround (LS) Right Surround (RS) Side Left (SL) Side Right (SR) iChannelNames 0 iTerminal 0 AudioControl Interface Descriptor: bLength12 bDescriptorType36 bDescriptorSubtype 2 (INPUT_TERMINAL) bTerminalID 4 wTerminalType 0x0201 Microphone bAssocTerminal 0 bNrChannels 2 wChannelConfig 0x0003 Left Front (L) Right Front (R) iChannelNames 0 iTerminal 0 AudioControl Interface Descriptor: bLength10 bDescriptorType36 bDescriptorSubtype 6 (FEATURE_UNIT) bUnitID 8 bSourceID 4 bControlSize1 bmaControls( 0) 0x01 Mute Control bmaControls( 1) 0x02 Volume Control bmaControls( 2) 0x02 Volume Control iFeature0 AudioControl Interface Descriptor: bLength10 bDescriptorType36 bDescriptorSubtype 6 (FEATURE_UNIT) bUnitID 9 bSourceID 4 bControlSize1 bmaControls( 0) 0x01 Mute Control bmaControls( 1) 0x02 Volume Control bmaControls( 2) 0x02 Volume Control iFeature0 AudioControl Interface Descriptor: bLength25 bDescriptorType36 bDescriptorSubtype 4 (MIXER_UNIT) bUnitID12 bNrInPins 3 baSourceID( 0) 1 baSourceID( 1) 9 baSourceID( 2) 11 bNrChannels 8 wChannelConfig 0x063f Left Front (L) Right Front (R) Center Front (C) Low Freqency Enhancement (LFE) Left Surround (LS) Right Surround (RS) Side Left (SL) Side Right (SR) iChannelNames 0 bmControls 0x00 bmControls 0x00 bmControls 0x00 iMixer 0 junk at descriptor end: 00 00 00 00 00 00 00 00 00 AudioControl Interface Descriptor: bLength16 bDescriptorType36 bDescriptorSubtype 6 (FEATURE_UNIT) bUnitID13 bSourceID 12 bControlSize1 bmaControls( 0) 0x01 Mute Control bmaControls( 1) 0x02 Volume Control bmaControl
Re: [Alsa-user] Hardware loopback
Denis Shulyaka wrote: > 2014/1/13 Clemens Ladisch >> there should be a normal mixer control for the front output. > > Unfortunately I am unable to find such control myself. What is the output of "lsusb -v" for this device? Regards, Clemens -- CenturyLink Cloud: The Leader in Enterprise Cloud Services. Learn Why More Businesses Are Choosing CenturyLink Cloud For Critical Workloads, Development Environments & Everything In Between. Get a Quote or Start a Free Trial Today. http://pubads.g.doubleclick.net/gampad/clk?id=119420431&iu=/4140/ostg.clktrk ___ Alsa-user mailing list Alsa-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/alsa-user
Re: [Alsa-user] Hardware loopback
Hi Clemens, 2014/1/13 Clemens Ladisch > As you can see in the block diagram, the S/PDIF input can be routed to > both the S/PDIF output and to the analong front outputs. "Loopback" > usually means the same kind of connection, so there should be a normal > mixer control for the front output. Thank you for the response. Unfortunately I am unable to find such control myself. Below is my amixer output: pi@speaker ~ $ amixer -c 0 info Card hw:0 'Device'/'USB Sound Device at usb-bcm2708_usb-1.2.1, full speed' Mixer name: 'USB Mixer' Components: 'USB0d8c:0102' Controls : 15 Simple ctrls : 6 pi@speaker ~ $ amixer -c 0 scontents Simple mixer control 'Speaker',0 Capabilities: pvolume pswitch pswitch-joined penum Playback channels: Front Left - Front Right - Rear Left - Rear Right - Front Center - Woofer - Side Left - Side Right Limits: Playback 0 - 197 Mono: Front Left: Playback 90 [46%] [-20.06dB] [on] Front Right: Playback 90 [46%] [-20.06dB] [on] Rear Left: Playback 90 [46%] [-20.06dB] [on] Rear Right: Playback 90 [46%] [-20.06dB] [on] Front Center: Playback 90 [46%] [-20.06dB] [on] Woofer: Playback 90 [46%] [-20.06dB] [on] Side Left: Playback 90 [46%] [-20.06dB] [on] Side Right: Playback 90 [46%] [-20.06dB] [on] Simple mixer control 'PCM',0 Capabilities: cvolume cswitch cswitch-joined penum Capture channels: Front Left - Front Right Limits: Capture 0 - 6928 Front Left: Capture 4096 [59%] [0.01dB] [on] Front Right: Capture 4096 [59%] [0.01dB] [on] Simple mixer control 'PCM Capture Source',0 Capabilities: enum Items: 'Mic' 'Line' 'IEC958 In' 'Mixer' Item0: 'IEC958 In' Simple mixer control 'Line',0 Capabilities: pvolume cvolume pswitch pswitch-joined cswitch cswitch-joined penum Playback channels: Front Left - Front Right Capture channels: Front Left - Front Right Limits: Playback 0 - 8065 Capture 0 - 6928 Front Left: Playback 6144 [76%] [0.01dB] [off] Capture 0 [0%] [-16.00dB] [off] Front Right: Playback 6144 [76%] [0.01dB] [off] Capture 0 [0%] [-16.00dB] [off] Simple mixer control 'Mic',0 Capabilities: pvolume cvolume pswitch pswitch-joined cswitch cswitch-joined penum Playback channels: Front Left - Front Right Capture channels: Front Left - Front Right Limits: Playback 0 - 8065 Capture 0 - 6928 Front Left: Playback 6153 [76%] [0.03dB] [off] Capture 4096 [59%] [0.01dB] [on] Front Right: Playback 6153 [76%] [0.03dB] [off] Capture 4096 [59%] [0.01dB] [on] Simple mixer control 'IEC958 In',0 Capabilities: cswitch cswitch-joined penum Capture channels: Mono Mono: Capture [on] The two controls related to SPDIF In are 'PCM Capture Source' and 'IEC958 In'. I'm not sure what they mean. The latter seems to enable/disable the mix of the SPDIF In into capture stream (i.e., Input). For the first one I have no idea. I will try to experiment with different values of the controls, but unfortunately for the following two weeks I will not have any SPDIF signal source to play with. Best regards, Denis Shulyaka -- CenturyLink Cloud: The Leader in Enterprise Cloud Services. Learn Why More Businesses Are Choosing CenturyLink Cloud For Critical Workloads, Development Environments & Everything In Between. Get a Quote or Start a Free Trial Today. http://pubads.g.doubleclick.net/gampad/clk?id=119420431&iu=/4140/ostg.clktrk ___ Alsa-user mailing list Alsa-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/alsa-user
Re: [Alsa-user] Hardware loopback
Denis Shulyaka wrote: > 2) USB sound card based on CM106 chip. > > For this to work as a SPDIF receiver I need to somehow connect SPDIF > IN and analog out. > > 1) Configure a loopback on hardware level for the best latency and >CPU usage > > I am currently trying to understand if my hardware supports Option 1. > I have found a CM106 datasheet which suggests that setting bit 2 > (SPDIFLOOP) of register REG1 will enable SPDIF loop-back, however it > is not clear whether the sound from SPDIF IN will be routed to SPDIF > OUT or analog output As you can see in the block diagram, the S/PDIF input can be routed to both the S/PDIF output and to the analong front outputs. "Loopback" usually means the same kind of connection, so there should be a normal mixer control for the front output. Regards, Clemens -- CenturyLink Cloud: The Leader in Enterprise Cloud Services. Learn Why More Businesses Are Choosing CenturyLink Cloud For Critical Workloads, Development Environments & Everything In Between. Get a Quote or Start a Free Trial Today. http://pubads.g.doubleclick.net/gampad/clk?id=119420431&iu=/4140/ostg.clktrk ___ Alsa-user mailing list Alsa-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/alsa-user
[Alsa-user] Hardware loopback
Hi list, Please forgive if it's the wrong place to post this question. I'm trying to build a sound server connected to my speaker set that will act as: 1) SPDIF receiver from TV 2) Network sound server My hardware: 1) Raspberry Pi 2) USB sound card based on CM106 chip. My Software: 1) Raspbian 2) Linux 3.10.25 3) Pulseaudio 2.0 (will try to compile 4.0 tonight) For this to work as a SPDIF receiver I need to somehow connect SPDIF IN and analog out. So my question is, What is the best way to configure it? If I get it right, I have three options here: 1) Configure a loopback on hardware level for the best latency and CPU usage 2) Configure a loopback on alsa level 3) Configure a loopback on pulseaudio level since I will use it for mixing anyway I am currently trying to understand if my hardware supports Option 1. I have found a CM106 datasheet which suggests that setting bit 2 (SPDIFLOOP) of register REG1 will enable SPDIF loop-back, however it is not clear whether the sound from SPDIF IN will be routed to SPDIF OUT or analog output and also whether this feature is what I'm looking for. If the first option is not available, I would also ask for your advice on which of the two last options is preferable. Thanks in advance! Best regards, Denis Shulyaka -- CenturyLink Cloud: The Leader in Enterprise Cloud Services. Learn Why More Businesses Are Choosing CenturyLink Cloud For Critical Workloads, Development Environments & Everything In Between. Get a Quote or Start a Free Trial Today. http://pubads.g.doubleclick.net/gampad/clk?id=119420431&iu=/4140/ostg.clktrk___ Alsa-user mailing list Alsa-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/alsa-user
