Re: AAC/DTS audio HDMI passthrough issue

Dear community,

Would be great if somebody has a hint about how to play 5+1 AC3 sound using mplayer. Thanks in advance!

On 2022-09-30 01:51, Dmitry Katsubo wrote:
>
> Dear MPlayer users,
>
> I am trying to enable passthrough for AAC/DTS audio channels, but unfortunately MPlayer fails to open a sound card:
>
> $ mplayer -afm hwac3 -vo fbdev2 test.mkv
> MPlayer 1.4 (Debian), built with gcc-10 (C) 2000-2019 MPlayer Team
> do_connect: could not connect to socket
> connect: No such file or directory
> Failed to open LIRC support. You will not be able to use your remote control.
>
> Playing test.mkv.
> libavformat version 58.45.100 (external)
> libavformat file format detected.
> [lavf] stream 0: video (h264), -vid 0
> [lavf] stream 1: audio (ac3), -aid 0, AC3 5.1 ~384 kbps
> VIDEO:  [H264]  960x402  0bpp  23.976 fps    0.0 kbps ( 0.0 kbyte/s)
> ==========================================================================
> ==========================================================================
> Clip info:
>  title: test :: AFM ::
>  encoder: libebml v1.3.1 + libmatroska v1.4.2
>  creation_time: 2016-12-28T00:01:43.000000Z
> ==========================================================================
> Trying to force audio codec driver family hwac3...
> Opening audio decoder: [hwac3] AC3/DTS pass-through S/PDIF
> hwac3: switched to AC3, 384000 bps, 48000 Hz
>
> AUDIO: 48000 Hz, 2 ch, ac3be, 384.0 kbit/25.00% (ratio: 48000->192000)
> Selected audio codec: [hwac3] afm: hwac3 (AC3 through S/PDIF)
> ==========================================================================
> AO: [pulse] Init failed: Connection refused
> Failed to initialize audio driver 'pulse'
> [AO_ALSA] alsa-lib: confmisc.c:1281:(snd_func_refer) Unable to find definition 'cards.HDA-Intel.pcm.iec958.7:CARD=0,AES0=6,AES1=130,AES2=0,AES3=2'
> [AO_ALSA] alsa-lib: conf.c:4745:(_snd_config_evaluate) function snd_func_refer returned error: No such file or directory
> [AO_ALSA] alsa-lib: conf.c:5233:(snd_config_expand) Evaluate error: No such file or directory
> [AO_ALSA] alsa-lib: pcm.c:2660:(snd_pcm_open_noupdate) Unknown PCM iec958:AES0=6
> [AO_ALSA] alsa-lib: confmisc.c:1281:(snd_func_refer) Unable to find definition 'cards.HDA-Intel.pcm.iec958.7:CARD=0,AES0=4,AES1=130,AES2=0,AES3=2'
> [AO_ALSA] alsa-lib: conf.c:4745:(_snd_config_evaluate) function snd_func_refer returned error: No such file or directory
> [AO_ALSA] alsa-lib: conf.c:5233:(snd_config_expand) Evaluate error: No such file or directory
> [AO_ALSA] alsa-lib: pcm.c:2660:(snd_pcm_open_noupdate) Unknown PCM iec958
> [AO_ALSA] Playback open error: No such file or directory
> Failed to initialize audio driver 'alsa'
> [AO SDL] Samplerate: 48000Hz Channels: Stereo Format ac3be
> [AO SDL] using aalib audio driver.
> [AO SDL] Unsupported audio format: 0x108.
> [AO SDL] Unable to open audio: No available audio device
> Failed to initialize audio driver 'sdl:aalib'
> Could not open/initialize audio device -> no sound.
> Audio: no sound
> Starting playback...
> Movie-Aspect is 2.39:1 - prescaling to correct movie aspect.
> Specified y offset not supported for YUV, reduced to 338.
> [swscaler @ 0x7fc8b2dd3000]bicubic scaler, from yuv420p to bgra using MMXEXT
> [swscaler @ 0x7fc8b2dd3000]using unscaled yuv420p -> bgra special converter
> VO: [fbdev2] 960x402 => 960x402 BGRA  [fs]
>
> I am totally confused with a card name cards.HDA-Intel.pcm.iec958.7 which is not listed as available one:
>
> $ aplay -l
> **** List of PLAYBACK Hardware Devices ****
> card 0: HDMI [HDA Intel HDMI], device 3: HDMI 0 [HDMI 0]
>   Subdevices: 1/1
>   Subdevice #0: subdevice #0
> card 0: HDMI [HDA Intel HDMI], device 7: HDMI 1 [HDMI 1]
>   Subdevices: 1/1
>   Subdevice #0: subdevice #0
> card 0: HDMI [HDA Intel HDMI], device 8: HDMI 2 [HDMI 2]
>   Subdevices: 1/1
>   Subdevice #0: subdevice #0
> card 0: HDMI [HDA Intel HDMI], device 9: HDMI 3 [HDMI 3]
>   Subdevices: 1/1
>   Subdevice #0: subdevice #0
> card 0: HDMI [HDA Intel HDMI], device 10: HDMI 4 [HDMI 4]
>   Subdevices: 1/1
>   Subdevice #0: subdevice #0
> card 1: PCH [HDA Intel PCH], device 0: ALC892 Analog [ALC892 Analog]
>   Subdevices: 1/1
>   Subdevice #0: subdevice #0
> card 1: PCH [HDA Intel PCH], device 1: ALC892 Digital [ALC892 Digital]
>   Subdevices: 1/1
>   Subdevice #0: subdevice #0
>
> $ cat /etc/asound.conf
> defaults.pcm.card 0
> defaults.pcm.device 7
> defaults.ctl.card 0
>
> $ iecset -x
> AES0=0x04,AES1=0x00,AES2=0x00,AES3=0x00
>
> $ iecset
> Mode: consumer
> Data: audio
> Rate: 44100 Hz
> Copyright: permitted
> Emphasis: none
> Category: general
> Original: 1st generation
> Clock: 1000 ppm
>
> When I force the default card/device like below, it complains and switches to 2 channels when paying audio:
>
> $ mplayer -afm hwac3 -ao alsa:device=plughw=0.7 -vo fbdev2 test.mkv
> Trying to force audio codec driver family hwac3...
> Opening audio decoder: [hwac3] AC3/DTS pass-through S/PDIF
> hwac3: switched to AC3, 384000 bps, 48000 Hz
>
> AUDIO: 48000 Hz, 2 ch, ac3be, 384.0 kbit/25.00% (ratio: 48000->192000)
> Selected audio codec: [hwac3] afm: hwac3 (AC3 through S/PDIF)
> ==========================================================================
> [AO_ALSA] alsa-lib: conf.c:5084:(parse_args) Unknown parameter AES0
> [AO_ALSA] alsa-lib: conf.c:5217:(snd_config_expand) Parse arguments error: No such file or directory
> [AO_ALSA] alsa-lib: pcm.c:2660:(snd_pcm_open_noupdate) Unknown PCM plughw:0,7,AES0=6
> AO: [alsa] 48000Hz 2ch ac3be (2 bytes per sample)
> Starting playback...
>
> Is there anything I've missed? Thanks in advance!
>
> I have read so far:
>
>   * Digital surround passthrough
>     <https://alsa.opensrc.org/DigitalOut#mplayer>
>   * Surround/Multichannel playback <http://www.mplayerhq.hu/DOCS/HTML/en/advaudio-surround.html>
>
> -- 
> With best regards,
> Dmitry


-- 
With best regards,
Dmitry

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