使ALSA能够捕获to 4207‘S SPDIF输入的音频

Question

在一个自定义平台上，我利用聪慧的SA5模块和附加的CS4207 HDA编解码器，尝试使用编解码器数字SPDIF输入和输出。HDA-设计是从康泰克的康纳-斯瓦尔评估委员会复制而来的。

SPDIF输出(连接到放大器)是开箱即用的--这里没有问题。

但是SPDIF的输入(信号需要被记录)让我头疼。

在测试期间，我使用了一个Xubuntu20.04

Linux Test-01 5.4.0-48-generic #52-Ubuntu SMP Thu Sep 10 10:58:49 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

稍后，我们将在buildroot中实现这些特性。

我到目前为止做了什么，

通过使用hda_analyser.py工具，我能够看到，在默认情况下，SPDIF输入小部件是禁用的。手动启用它们对结果没有任何影响：

# Node 0x07 SPDIF Reciver Input Converter - Enable
hda-verb /dev/snd/hwC0D0 0x07 0x70d 0x01
# Node 0x0f SPDIF Reciver Input Pin - Enable
hda-verb /dev/snd/hwC0D0 0x0f 0x707 0x20

当我向SPDIF输入提供信号时，hda_analyser将显示信号的有效标志和控制字内容。所以我认为消息来源是好的。

通过手动启用By 4207‘S "SPDIF到TX1环通“功能：

# Enable Rx to Tx1 Loopthru
hda-verb /dev/snd/hwC0D0 0x11 0x0500 0x01 && hda-verb /dev/snd/hwC0D0 0x11 0x0400 0x402a

我也能听到信号输入到SPDIF输入从扬声器连接到SPDIF输出。

->，所以我的结论是硬件部分应该是好的。

在ALSA方面，我认为有一个配置问题，因为没有列出IEC958数字捕获设备。但这也是我脑子不清醒的地方。有太多的配置路径(/usr/share/pulseaudio/alsa-mixer/ /etc/alsa/conf.d/ /usr/share/alsa/)和更多的配置模板，它们的占位符似乎都是由其他东西填充的。但我没有找到一种方法来找出有效使用的配置。

在ALSA文档中也找不到任何提示。

aplay -l输出

**** List of PLAYBACK Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: CS4207 Analog [CS4207 Analog]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 1: CS4207 Digital [CS4207 Digital]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 3: HDMI 0 [HDMI 0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 7: HDMI 1 [HDMI 1]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 8: HDMI 2 [HDMI 2]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 9: HDMI 3 [HDMI 3]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 10: HDMI 4 [HDMI 4]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

arecord -l的输出(此处没有数字输入)：

**** List of CAPTURE Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: CS4207 Analog [CS4207 Analog]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

pacmd list-cards的输出：

1 card(s) available.
    index: 0
        name: <alsa_card.pci-0000_00_0e.0>
        driver: <module-alsa-card.c>
        owner module: 7
        properties:
                alsa.card = "0"
                alsa.card_name = "HDA Intel PCH"
                alsa.long_card_name = "HDA Intel PCH at 0x91410000 irq 143"
                alsa.driver_name = "snd_hda_intel"
                device.bus_path = "pci-0000:00:0e.0"
                sysfs.path = "/devices/pci0000:00/0000:00:0e.0/sound/card0"
                device.bus = "pci"
                device.vendor.id = "8086"
                device.vendor.name = "Intel Corporation"
                device.product.id = "5a98"
                device.product.name = "Celeron N3350/Pentium N4200/Atom E3900 Series Audio Cluster"
                device.form_factor = "internal"
                device.string = "0"
                device.description = "Built-in Audio"
                module-udev-detect.discovered = "1"
                device.icon_name = "audio-card-pci"
        profiles:
                input:analog-stereo: Analog Stereo Input (priority 65, available: unknown)
                output:analog-stereo: Analog Stereo Output (priority 6500, available: unknown)
                output:analog-stereo+input:analog-stereo: Analog Stereo Duplex (priority 6565, available: unknown)
                output:iec958-stereo: Digital Stereo (IEC958) Output (priority 5500, available: unknown)
                output:iec958-stereo+input:analog-stereo: Digital Stereo (IEC958) Output + Analog Stereo Input (priority 5565, available: unknown)
                output:hdmi-stereo: Digital Stereo (HDMI) Output (priority 5900, available: no)
                output:hdmi-stereo+input:analog-stereo: Digital Stereo (HDMI) Output + Analog Stereo Input (priority 5965, available: no)
                output:hdmi-surround: Digital Surround 5.1 (HDMI) Output (priority 800, available: no)
                output:hdmi-surround+input:analog-stereo: Digital Surround 5.1 (HDMI) Output + Analog Stereo Input (priority 865, available: no)
                output:hdmi-surround71: Digital Surround 7.1 (HDMI) Output (priority 800, available: no)
                output:hdmi-surround71+input:analog-stereo: Digital Surround 7.1 (HDMI) Output + Analog Stereo Input (priority 865, available: no)
                output:hdmi-stereo-extra1: Digital Stereo (HDMI 2) Output (priority 5700, available: no)
                output:hdmi-stereo-extra1+input:analog-stereo: Digital Stereo (HDMI 2) Output + Analog Stereo Input (priority 5765, available: no)
                output:hdmi-surround-extra1: Digital Surround 5.1 (HDMI 2) Output (priority 600, available: no)
                output:hdmi-surround-extra1+input:analog-stereo: Digital Surround 5.1 (HDMI 2) Output + Analog Stereo Input (priority 665, available: no)
                output:hdmi-surround71-extra1: Digital Surround 7.1 (HDMI 2) Output (priority 600, available: no)
                output:hdmi-surround71-extra1+input:analog-stereo: Digital Surround 7.1 (HDMI 2) Output + Analog Stereo Input (priority 665, available: no)
                output:hdmi-stereo-extra2: Digital Stereo (HDMI 3) Output (priority 5700, available: no)
                output:hdmi-stereo-extra2+input:analog-stereo: Digital Stereo (HDMI 3) Output + Analog Stereo Input (priority 5765, available: no)
                output:hdmi-surround-extra2: Digital Surround 5.1 (HDMI 3) Output (priority 600, available: no)
                output:hdmi-surround-extra2+input:analog-stereo: Digital Surround 5.1 (HDMI 3) Output + Analog Stereo Input (priority 665, available: no)
                output:hdmi-surround71-extra2: Digital Surround 7.1 (HDMI 3) Output (priority 600, available: no)
                output:hdmi-surround71-extra2+input:analog-stereo: Digital Surround 7.1 (HDMI 3) Output + Analog Stereo Input (priority 665, available: no)
                output:hdmi-stereo-extra3: Digital Stereo (HDMI 4) Output (priority 5700, available: no)
                output:hdmi-stereo-extra3+input:analog-stereo: Digital Stereo (HDMI 4) Output + Analog Stereo Input (priority 5765, available: no)
                output:hdmi-surround-extra3: Digital Surround 5.1 (HDMI 4) Output (priority 600, available: no)
                output:hdmi-surround-extra3+input:analog-stereo: Digital Surround 5.1 (HDMI 4) Output + Analog Stereo Input (priority 665, available: no)
                output:hdmi-surround71-extra3: Digital Surround 7.1 (HDMI 4) Output (priority 600, available: no)
                output:hdmi-surround71-extra3+input:analog-stereo: Digital Surround 7.1 (HDMI 4) Output + Analog Stereo Input (priority 665, available: no)
                output:hdmi-stereo-extra4: Digital Stereo (HDMI 5) Output (priority 5700, available: no)
                output:hdmi-stereo-extra4+input:analog-stereo: Digital Stereo (HDMI 5) Output + Analog Stereo Input (priority 5765, available: no)
                output:hdmi-surround-extra4: Digital Surround 5.1 (HDMI 5) Output (priority 600, available: no)
                output:hdmi-surround-extra4+input:analog-stereo: Digital Surround 5.1 (HDMI 5) Output + Analog Stereo Input (priority 665, available: no)
                output:hdmi-surround71-extra4: Digital Surround 7.1 (HDMI 5) Output (priority 600, available: no)
                output:hdmi-surround71-extra4+input:analog-stereo: Digital Surround 7.1 (HDMI 5) Output + Analog Stereo Input (priority 665, available: no)
                off: Off (priority 0, available: unknown)
        active profile: <output:analog-stereo+input:analog-stereo>
        sinks:
                alsa_output.pci-0000_00_0e.0.analog-stereo/#0: Built-in Audio Analog Stereo
        sources:
                alsa_output.pci-0000_00_0e.0.analog-stereo.monitor/#0: Monitor of Built-in Audio Analog Stereo
                alsa_input.pci-0000_00_0e.0.analog-stereo/#1: Built-in Audio Analog Stereo
        ports:
                analog-input-mic: Microphone (priority 8700, latency offset 0 usec, available: no)
                        properties:
                                device.icon_name = "audio-input-microphone"
                analog-input-linein: Line In (priority 8100, latency offset 0 usec, available: yes)
                        properties:

                analog-output-lineout: Line Out (priority 9000, latency offset 0 usec, available: no)
                        properties:

                analog-output-speaker: Speakers (priority 10000, latency offset 0 usec, available: unknown)
                        properties:
                                device.icon_name = "audio-speakers"
                analog-output-headphones: Headphones (priority 9900, latency offset 0 usec, available: no)
                        properties:
                                device.icon_name = "audio-headphones"
                iec958-stereo-output: Digital Output (S/PDIF) (priority 0, latency offset 0 usec, available: unknown)
                        properties:

                hdmi-output-0: HDMI / DisplayPort (priority 5900, latency offset 0 usec, available: no)
                        properties:
                                device.icon_name = "video-display"
                hdmi-output-1: HDMI / DisplayPort 2 (priority 5800, latency offset 0 usec, available: no)
                        properties:
                                device.icon_name = "video-display"
                hdmi-output-2: HDMI / DisplayPort 3 (priority 5700, latency offset 0 usec, available: no)
                        properties:
                                device.icon_name = "video-display"
                hdmi-output-3: HDMI / DisplayPort 4 (priority 5600, latency offset 0 usec, available: no)
                        properties:
                                device.icon_name = "video-display"
                hdmi-output-4: HDMI / DisplayPort 5 (priority 5500, latency offset 0 usec, available: no)
                        properties:
                                device.icon_name = "video-display"

另一件引起我注意的事情是/usr/share/pulseaudio/alsa-mixer/paths/analog-input.conf.common上的一条评论

;  We explicitly don't want to wrap the following sources:
;
;       CD
[...]
;       Digital/SPDIF

现在的

那么，是否有一种简单的方法可以简单地启用IEC958捕获设备？

在哪里或如何获得当前有效的alsa配置以进行修改？

-->见这个答案

编辑

CS4207编解码器的SPDIF-In特性在内核3.5和3.8之间丢失了。在此期间，对补丁_cirrus.c进行了主要的重构。

因此，即使当我为i 958输入添加ALSA控件(从内核3.5的默认配置复制)到当前内核的合并时：

    control.67 {
        iface MIXER
        name 'IEC958 Capture Switch'
        value false
        comment {
            access 'read write'
            type BOOLEAN
            count 1
        }
    }
    control.68 {
        iface MIXER
        name 'IEC958 Capture Default'
        value '0400000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000'
        comment {
            access read
            type IEC958
            count 1
        }
    }

我得到了回报：

Found hardware: "HDA-Intel" "Cirrus Logic CS4207" "HDA:10134207,10134207,00100302 HDA:8086280a,80860101,00100000" "0x8086" "0x7270"
Hardware is initialized using a generic method
alsactl: set_control:1325: failed to obtain info for control #67 (No such file or directory)
alsactl: set_control:1325: failed to obtain info for control #68 (No such file or directory)

因此，hda驱动程序似乎没有向系统提供SPDIF输入。因此，这个问题不再是关于ALSA配置的，而是与hda驱动相关的.

Answer 1

使SPDIF-In可用

主要问题是snd_hda框架目前只支持一个数字输入引脚，而CS4207有3种支持。

在解析编解码器引脚期间，它们都通过循环，最后一个则获胜，并呈现给ALSA。诀窍是没有配置任何连接在循环中跳过的引脚。

通常，引脚配置是由BIOS设置的。因为我们在这个设置中不控制BIOS，所以这不是一个选项。

另一种选择是使用修补程序文件(如早期修补程序一节中描述的这里 )来设置引脚配置。

为此，我需要引脚节点ID (在本例中为0x0E和0x12 )，并读取它们当前的引脚配置：

# hda-verb /dev/snd/hwC0D0 0x0e GET_CONFIG_DEFAULT 0x00
nid = 0xe, verb = 0xf1c, param = 0x0
value = 0xb7d6003e
# hda-verb /dev/snd/hwC0D0 0x12 GET_CONFIG_DEFAULT 0x00
nid = 0x12, verb = 0xf1c, param = 0x0
value = 0xb7d6005e

替代方案

# cat /sys/class/sound/hwC0D0/init_pin_configs
0x09 0x022140f0
0x0a 0x010140f0
0x0b 0x901700f0
0x0c 0x01813051
0x0d 0x01a19031
0x0e 0xb7d6003e
0x0f 0x02c4e0f0
0x10 0x014460f0
0x12 0xb7d6005e
0x15 0x014510f0

然后将配置中的前2位更改为“无连接”(01)。配置位的含义记录在HDA规范 7.3.3.31配置默认值中。

0x0e 0xb7d6003e -> 0x0e 0x77d6003e和0x12 0xb7d6005e -> 0x12 0xb7d6005e。

可以使用这些值创建具有以下内容的修补程序文件(例如/lib/firmware/patch_cs4207 )：

[codec]
0x10134207 0x10134207 0

[pincfg]
0x0e 0x77d6003e
0x12 0x77d6005e

在编解码器下，需要列出vendor_id、subsystem_id和address。

之后，修补程序文件需要由snd_hda_intel加载。为此，需要将以下行添加到/etc/modprobe.d/alsa-base.conf中：

options snd-hda-intel patch=patch_cs4207

重新启动后，无需进一步调整ALSA，SPDIF-In将被识别：

# arecord -l
**** List of CAPTURE Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: CS4207 Analog [CS4207 Analog]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 1: CS4207 Digital [CS4207 Digital]
  Subdevices: 0/1
  Subdevice #0: subdevice #0

Answer 2

请参阅原始文章中的编辑以了解其他(ALSA无关的)问题。

对有关ALSA-配置的原始问题的回答：

alsa-info似乎也是第一位看的最好的地方。

根据该脚本，您可以通过以下方式保存当前有效的ALSA确认：

alsactl -f /tmp/alsa-config.txt store

之后，可以在文件中更改配置(在本例中为/tmp/alsa-config.txt)，配置可以通过

alsactl -f /tmp/alsa-config.txt restore

此外，当前有效的ALSA-配置默认存储在

/var/lib/alsa/asound.state