PULSEAUDIO 没有将我的 ALSA 捕获设备列为捕获源

2024-6-3 • tag-icon

我最近为我的音频捕获卡编写了一个 ALSA 驱动程序，但在 PulseAudio 将其识别为捕获源时遇到了问题。

以下是一些事实，希望你们中有人过去经历过这种情况并能够提供帮助：

采集卡有 2 个音频输入（立体声）：一个 HDMI 和一个模拟。直接使用 ALSA 时，我可以从这两个输入中捕获声音。
当我使用 pulseaudio 命令列出音频捕获源时：
```
$ pactl list | grep -A2 'Source #' | grep 'Name: ' | cut -d" " -f2 
```
输出显示以下内容，它们是板载设备，不使用我的 ALSA 驱动程序：
```
alsa_output.pci-0000_00_1b.0.analog-stereo.monitor
alsa_input.pci-0000_00_1b.0.analog-stereo
```
因此从上面可以看出我的设备没有被列为捕获源。

当我使用时：

$ pactl list

输出中显示了“我的” ALSA 卡。请参见以下 2 个示例输出：(a) 针对板载卡（不使用我的驱动程序）和 (b) 针对使用我的驱动程序的卡：

（a）机载卡：

    Card #0
        Name: alsa_card.pci-0000_00_1b.0
        Driver: module-alsa-card.c
        Owner Module: 4
        Properties:
            alsa.card = "10"
            alsa.card_name = "HDA Intel PCH"
            alsa.long_card_name = "HDA Intel PCH at 0xfbf20000 irq 67"
            alsa.driver_name = "snd_hda_intel"
            device.bus_path = "pci-0000:00:1b.0"
            sysfs.path = "/devices/pci0000:00/0000:00:1b.0/sound/card10"
            device.bus = "pci"
            device.vendor.id = "8086"
            device.vendor.name = "Intel Corporation"
            device.product.name = "6 Series/C200 Series Chipset Family High Definition Audio Controller"
            device.form_factor = "internal"
            device.string = "10"
            device.description = "Built-in Audio"
            module-udev-detect.discovered = "1"
            device.icon_name = "audio-card-pci"
        Profiles:
            output:analog-stereo: Analogue Stereo Output (sinks: 1, sources: 0, priority. 6000)
            output:analog-stereo+input:analog-stereo: Analogue Stereo Duplex (sinks: 1, sources: 1, priority. 6060)
            output:analog-surround-40: Analogue Surround 4.0 Output (sinks: 1, sources: 0, priority. 700)
            output:analog-surround-40+input:analog-stereo: Analogue Surround 4.0 Output + Analogue Stereo Input (sinks: 1, sources: 1, priority. 760)
            output:analog-surround-41: Analogue Surround 4.1 Output (sinks: 1, sources: 0, priority. 800)
            output:analog-surround-41+input:analog-stereo: Analogue Surround 4.1 Output + Analogue Stereo Input (sinks: 1, sources: 1, priority. 860)
            output:analog-surround-50: Analogue Surround 5.0 Output (sinks: 1, sources: 0, priority. 700)
            output:analog-surround-50+input:analog-stereo: Analogue Surround 5.0 Output + Analogue Stereo Input (sinks: 1, sources: 1, priority. 760)
            output:analog-surround-51: Analogue Surround 5.1 Output (sinks: 1, sources: 0, priority. 800)
            output:analog-surround-51+input:analog-stereo: Analogue Surround 5.1 Output + Analogue Stereo Input (sinks: 1, sources: 1, priority. 860)
            input:analog-stereo: Analogue Stereo Input (sinks: 0, sources: 1, priority. 60)
            off: Off (sinks: 0, sources: 0, priority. 0)
        Active Profile: output:analog-stereo+input:analog-stereo
        Ports:
            analog-output: Analogue Output (priority 9900)
                Part of profile(s): output:analog-stereo, output:analog-stereo+input:analog-stereo, output:analog-surround-40, output:analog-surround-40+input:analog-stereo, output:analog-surround-41, output:analog-surround-41+input:analog-stereo, output:analog-surround-50, output:analog-surround-50+input:analog-stereo, output:analog-surround-51, output:analog-surround-51+input:analog-stereo
            analog-input-microphone: Microphone (priority 8700)
                Part of profile(s): output:analog-stereo+input:analog-stereo, output:analog-surround-40+input:analog-stereo, output:analog-surround-41+input:analog-stereo, output:analog-surround-50+input:analog-stereo, output:analog-surround-51+input:analog-stereo, input:analog-stereo
            analog-input-linein: Line In (priority 8100)
                Part of profile(s): output:analog-stereo+input:analog-stereo, output:analog-surround-40+input:analog-stereo, output:analog-surround-41+input:analog-stereo, output:analog-surround-50+input:analog-stereo, output:analog-surround-51+input:analog-stereo, input:analog-stereo

（b）我的一张卡（我有多张卡）：

    Card #11
        Name: alsa_card.1
        Driver: module-alsa-card.c
        Owner Module: 31
        Properties:
            alsa.card = "1"
            alsa.card_name = "OEM_VISIONRGB_AV"
            alsa.long_card_name = "OEM_VISIONRGB_AV Analog DGC dada"
            device.bus_path = "/devices/virtual/sound/card1"
            sysfs.path = "/devices/virtual/sound/card1"
            device.string = "1"
            device.description = "OEM_VISIONRGB_AV"
            module-udev-detect.discovered = "1"
            device.icon_name = "audio-card"
        Profiles:
            input:analog-stereo: Analogue Stereo Input (sinks: 0, sources: 1, priority. 60)
            off: Off (sinks: 0, sources: 0, priority. 0)
        Active Profile: input:analog-stereo
        Ports:
            analog-input: Analogue Input (priority 10000)
                Part of profile(s): input:analog-stereo

请注意，我的卡和板载卡上的“姓名”字段在格式上有很大不同。我测试了：

从alsa_card.pci-0000_00_1b.0（板载卡）捕获数据可以正常进行。
alsa_card.1它无法从（我的卡）捕获。

请注意，我的 ALSA 驱动程序仍然缺少一些元素，例如，未包含混频器元素，我推测这可能是 ALSA 和 PULSEAUDIO 之间缺乏合作的原因。根据您的经验，您是否知道混频器元素对于 PULSEAUDIO 是否是将 ALSA 设备限定为捕获源所必需的。

我很抱歉发了这么冗长的信息。不过，上面的内容有没有给你一些启发？

相关内容