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kokoko3k

Member

Registered: 2008-11-14

Posts: 2,457

How to add/remove ac-3,dts,eac3 etc formats to a sink?

Finally I managed to have my laptop output an ac3 encoded stream to my TV and the TV passing it through to the 5.1 ac decoder.

I wasn't able to do it in the past because that format wasn't "published" by the output sink; but I've found that I can enable various formats via pavucontrol (output tab -> advanced).

koko@thinkbook# pactl list sinks 
Sink #651
        State: SUSPENDED
        Name: alsa_output.pci-0000_00_1f.3.hdmi-stereo
        Description: Built-in Audio Digital Stereo (HDMI)
        Driver: PipeWire
        Sample Specification: s32le 2ch 44100Hz
        Channel Map: front-left,front-right
        Owner Module: 4294967295
        Mute: no
        Volume: front-left: 65536 / 100% / 0,00 dB,   front-right: 65536 / 100% / 0,00 dB
                balance 0,00
        Base Volume: 65536 / 100% / 0,00 dB
        Monitor Source: alsa_output.pci-0000_00_1f.3.hdmi-stereo.monitor
        Latency: 0 usec, configured 0 usec
        Flags: HARDWARE DECIBEL_VOLUME LATENCY SET_FORMATS 
        Properties:
                object.path = "alsa:acp:PCH:8:playback"
                api.alsa.path = "hdmi:0"
                api.alsa.pcm.card = "0"
                api.alsa.pcm.stream = "playback"
                port.group = "playback"
                device.icon_name = "audio-card-analog"
                device.bus = "pci"
                audio.channels = "2"
                audio.position = "FL,FR"
                iec958.codecs = "[\"PCM\",\"AC3\",\"EAC3\",\"TrueHD\"]"
                device.routes = "1"
                alsa.resolution_bits = "16"
                alsa.card = "0"
                alsa.card_name = "HDA Intel PCH"
                alsa.long_card_name = "HDA Intel PCH at 0x6001130000 irq 151"
                alsa.driver_name = "snd_hda_intel"
                alsa.mixer_name = "Realtek ALC257"
                alsa.components = "HDA:10ec0257,17aa3851,00100001 HDA:8086280f,80860101,00100000"
                alsa.id = "HDMI 0"
                device.api = "alsa"
                device.class = "sound"
                alsa.class = "generic"
                alsa.subclass = "generic-mix"
                alsa.name = "LG TV SSCR2"
                alsa.subdevice = "0"
                alsa.subdevice_name = "subdevice #0"
                alsa.device = "3"
                alsa.sync.id = "00000000:00000000:00000000:00000000"
                device.profile.name = "hdmi-stereo"
                device.profile.description = "Digital Stereo (HDMI)"
                card.profile.device = "8"
                device.id = "43"
                factory.name = "api.alsa.pcm.sink"
                priority.driver = "952"
                priority.session = "952"
                media.class = "Audio/Sink"
                node.nick = "HDA Intel PCH"
                node.name = "alsa_output.pci-0000_00_1f.3.hdmi-stereo"
                device.description = "Built-in Audio"
                device.bus_path = "pci-0000:00:1f.3"
                device.form_factor = "internal"
                factory.id = "19"
                clock.quantum-limit = "8192"
                client.id = "34"
                node.driver = "true"
                node.loop.name = "data-loop.0"
                library.name = "audioconvert/libspa-audioconvert"
                object.id = "130"
                object.serial = "651"
                device.enum.api = "udev"
                api.alsa.card = "0"
                api.alsa.card.name = "HDA Intel PCH"
                api.alsa.card.longname = "HDA Intel PCH at 0x6001130000 irq 151"
                device.plugged.usec = "5029842"
                sysfs.path = "/devices/pci0000:00/0000:00:1f.3/sound/card0"
                device.subsystem = "sound"
                device.vendor.id = "0x8086"
                device.vendor.name = "Intel Corporation"
                device.product.id = "0x34c8"
                device.product.name = "Ice Lake-LP Smart Sound Technology Audio Controller"
                device.name = "alsa_card.pci-0000_00_1f.3"
                device.nick = "HDA Intel PCH"
                api.dbus.ReserveDevice1 = "Audio0"
                device.string = "0"
        Ports:
                hdmi-output-0: HDMI / DisplayPort (type: HDMI, priority: 5900, availability group: Legacy 4, available)
        Active Port: hdmi-output-0
        Formats:
                pcm
                ac3-iec61937, format.rate = "{ \"min\": 32000, \"max\": 192000 }"
                eac3-iec61937, format.rate = "{ \"min\": 32000, \"max\": 192000 }"

Now under "Formats:" I've pcm, ac3, eac3.

My question is: How can I manually add or remove them via command line? I'm using pipewire.
Thanks!

Last edited by kokoko3k (2025-11-16 11:37:49)

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