我的声卡有多少音频通道？

Question

我有一块技嘉 GA-H170N-WIFI主板，我想用它作为家庭音响系统的基础。它有两个 HDMI 输出和 5.1 模拟音频输出。

问题是，我如何知道声卡/子系统支持多少个独立的音频通道？我真的可以让每个 HDMI 输出有 8 个独立的音频通道，外加 6 个模拟通道（更不用说 S/PDIF 输出上多达 8 个通道）同时运行，发送不同的信号吗？此外，是否有可能说服 PulseAudio“拆分”HDMI 音频通道并将它们提供为 8 个独立的接收器？

谢谢！

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更新：我的 /proc/asound/card0/codec#2

Codec: Intel Skylake HDMI
Address: 2
AFG Function Id: 0x1 (unsol 0)
Vendor Id: 0x80862809
Subsystem Id: 0x80860101
Revision Id: 0x100000
No Modem Function Group found
Default PCM:
    rates [0x0]:
    bits [0x0]:
    formats [0x0]:
Default Amp-In caps: N/A
Default Amp-Out caps: N/A
State of AFG node 0x01:
  Power states:  D0 D3 CLKSTOP EPSS
  Power: setting=D0, actual=D0, Clock-stop-OK
GPIO: io=0, o=0, i=0, unsolicited=0, wake=0
Node 0x02 [Audio Output] wcaps 0x6611: 8-Channels Digital
  Converter: stream=0, channel=0
  Digital: Enabled KAE
  Digital category: 0x0
  IEC Coding Type: 0x0
  PCM:
    rates [0x7f0]: 32000 44100 48000 88200 96000 176400 192000
    bits [0x1a]: 16 24 32
    formats [0x5]: PCM AC3
  Power states:  D0 D3 EPSS
  Power: setting=D0, actual=D0
Node 0x03 [Audio Output] wcaps 0x6611: 8-Channels Digital
  Converter: stream=0, channel=0
  Digital: Enabled KAE
  Digital category: 0x0
  IEC Coding Type: 0x0
  PCM:
    rates [0x7f0]: 32000 44100 48000 88200 96000 176400 192000
    bits [0x1a]: 16 24 32
    formats [0x5]: PCM AC3
  Power states:  D0 D3 EPSS
  Power: setting=D0, actual=D0
Node 0x04 [Audio Output] wcaps 0x6611: 8-Channels Digital
  Converter: stream=0, channel=0
  Digital: Enabled KAE
  Digital category: 0x0
  IEC Coding Type: 0x0
  PCM:
    rates [0x7f0]: 32000 44100 48000 88200 96000 176400 192000
    bits [0x1a]: 16 24 32
    formats [0x5]: PCM AC3
  Power states:  D0 D3 EPSS
  Power: setting=D0, actual=D0
Node 0x05 [Pin Complex] wcaps 0x40778d: 8-Channels Digital Amp-Out CP
  Amp-Out caps: ofs=0x00, nsteps=0x00, stepsize=0x00, mute=1
  Amp-Out vals:  [0x00 0x00]
  Pincap 0x0b000094: OUT Detect HBR HDMI DP
  Pin Default 0x18560010: [Jack] Digital Out at Int HDMI
    Conn = Digital, Color = Unknown
    DefAssociation = 0x1, Sequence = 0x0
  Pin-ctls: 0x40: OUT
  Unsolicited: tag=00, enabled=0
  Power states:  D0 D3 EPSS
  Power: setting=D0, actual=D0
  Devices: 0
  Connection: 3
     0x02* 0x03 0x04
Node 0x06 [Pin Complex] wcaps 0x40778d: 8-Channels Digital Amp-Out CP
  Amp-Out caps: ofs=0x00, nsteps=0x00, stepsize=0x00, mute=1
  Amp-Out vals:  [0x00 0x00]
  Pincap 0x0b000094: OUT Detect HBR HDMI DP
  Pin Default 0x18560010: [Jack] Digital Out at Int HDMI
    Conn = Digital, Color = Unknown
    DefAssociation = 0x1, Sequence = 0x0
  Pin-ctls: 0x00:
  Unsolicited: tag=00, enabled=0
  Power states:  D0 D3 EPSS
  Power: setting=D0, actual=D0
  Devices: 0
  Connection: 0
  In-driver Connection: 3
     0x02 0x03 0x04
Node 0x07 [Pin Complex] wcaps 0x40778d: 8-Channels Digital Amp-Out CP
  Amp-Out caps: ofs=0x00, nsteps=0x00, stepsize=0x00, mute=1
  Amp-Out vals:  [0x00 0x00]
  Pincap 0x0b000094: OUT Detect HBR HDMI DP
  Pin Default 0x18560010: [Jack] Digital Out at Int HDMI
    Conn = Digital, Color = Unknown
    DefAssociation = 0x1, Sequence = 0x0
  Pin-ctls: 0x00:
  Unsolicited: tag=00, enabled=0
  Power states:  D0 D3 EPSS
  Power: setting=D0, actual=D0
  Devices: 0
  Connection: 0
  In-driver Connection: 3
     0x02 0x03 0x04
Node 0x08 [Vendor Defined Widget] wcaps 0xf00000: Mono

Answer 1

根据编解码器信息，您有 3 个转换器节点（接受数字数据流），每个节点有 8 个通道，以及 3 个 pin 节点（连接到图形卡以将声音流嵌入到 HDMI 中）。

所以你的硬件确实能够为每个 HDMI 提供 8 个通道加上 6 个模拟通道（除非 HDA 声卡有带宽限制，但我猜你只需要尝试一下），它甚至可以为另一个 HDMI 输出做额外的 8 个通道如果你有物理输出。

不过，在 Pulseaudio 的两个 HDMI 通道上设置同时输出可能有点头疼。/usr/share/pulseaudio/alsa-mixer/如果您确实打算这样做，则可能需要摆弄配置文件集。

您可以使用module-remap-sink模块在 Pulseaudio 中轻松地将通道拆分为额外的接收器。