- Alsa-devel - mailman.alsa-project.org

Help on specifying 'chmap' in asound.conf
by Xinhui Zhou 19 Jul '24

19 Jul '24

Dear all, I am having a question regarding how to specify 'champ' for a plugin. I do not see any examples of this. I tried many ways to specify but failed. As indicated by the link below, I can specify the MAP as a string array. Can someone provide one example on how exactly this [chmap MAP] can be specified? " pcm.name { type cras [chmap MAP] # Provide channel maps; MAP is a string array } " https://www.alsa-project.org/alsa-doc/alsa-lib/pcm_plugins.html I can something like these, but none of these work for me. chmap LFE chmap "LFE" chmap FR,FL,LFE champ "FR,FL,LFE" Thanks! Xinhui,

3 3

[PATCH alsa-utils 1/2] aplaymidi2: Add -a option to pass all UMP packets
by Takashi Iwai 19 Jul '24

19 Jul '24

So far, aplaymidi2 passes the MIDI1/MIDI2 channel voice UMP messages to the target while processing other UMP messages internally. But sometimes we'd like to pass all UMP messages as is and let the receiver processes. This patch adds a new option -a (or --passall) to pass the all UMP packets included in the given MIDI Clip file to the target as-is. Signed-off-by: Takashi Iwai <tiwai(a)suse.de> --- seq/aplaymidi2/aplaymidi2.1 | 8 ++++++++ seq/aplaymidi2/aplaymidi2.c | 20 +++++++++++++++----- 2 files changed, 23 insertions(+), 5 deletions(-) diff --git a/seq/aplaymidi2/aplaymidi2.1 b/seq/aplaymidi2/aplaymidi2.1 index fc85943c0d38..681796222914 100644 --- a/seq/aplaymidi2/aplaymidi2.1 +++ b/seq/aplaymidi2/aplaymidi2.1 @@ -67,6 +67,14 @@ Default is 2 seconds. .I \-s, \-\-silent Don't show message texts. +.TP +.I \-a, \-\-passall +Pass all UMP packets as is. + +As default, \fBaplaymidi2\fP passes only MIDI1 and MIDI2 channel voice +messages and process other UMP packets internally. +With this option, it passes all UMP packets to the target. + .SH SEE ALSO pmidi(1) .br diff --git a/seq/aplaymidi2/aplaymidi2.c b/seq/aplaymidi2/aplaymidi2.c index 6a1f21e92444..f5dfdbd91f30 100644 --- a/seq/aplaymidi2/aplaymidi2.c +++ b/seq/aplaymidi2/aplaymidi2.c @@ -21,6 +21,7 @@ static snd_seq_addr_t ports[16]; static int queue; static int end_delay = 2; static int silent; +static int passall; static unsigned int _current_tempo = 50000000; /* default 120 bpm */ static unsigned int tempo_base = 10; @@ -411,6 +412,9 @@ static void play_midi(FILE *file) while ((len = read_ump_packet(file, ump)) > 0) { const snd_ump_msg_hdr_t *h = (snd_ump_msg_hdr_t *)ump; + if (passall) + send_ump(ump, len); + if (h->type == SND_UMP_MSG_TYPE_UTILITY) { const snd_ump_msg_utility_t *uh = (const snd_ump_msg_utility_t *)ump; @@ -448,9 +452,10 @@ static void play_midi(FILE *file) end_clip(); continue; } - } else if (h->type == SND_UMP_MSG_TYPE_MIDI1_CHANNEL_VOICE || - h->type == SND_UMP_MSG_TYPE_DATA || - h->type == SND_UMP_MSG_TYPE_MIDI2_CHANNEL_VOICE) { + } else if (!passall && + (h->type == SND_UMP_MSG_TYPE_MIDI1_CHANNEL_VOICE || + h->type == SND_UMP_MSG_TYPE_DATA || + h->type == SND_UMP_MSG_TYPE_MIDI2_CHANNEL_VOICE)) { send_ump(ump, len); } } @@ -496,7 +501,8 @@ static void usage(const char *argv0) "-V, --version print current version\n" "-p, --port=client:port,... set port(s) to play to\n" "-d, --delay=seconds delay after song ends\n" - "-s, --silent don't show texts\n", + "-s, --silent don't show texts\n" + "-a, --passall pass all UMP packets as-is\n", argv0); } @@ -513,13 +519,14 @@ int main(int argc, char *argv[]) {"port", 1, NULL, 'p'}, {"delay", 1, NULL, 'd'}, {"silent", 0, NULL, 's'}, + {"passall", 0, NULL, 'a'}, {0} }; int c; init_seq(); - while ((c = getopt_long(argc, argv, "hVp:d:s", + while ((c = getopt_long(argc, argv, "hVp:d:sa", long_options, NULL)) != -1) { switch (c) { case 'h': @@ -537,6 +544,9 @@ int main(int argc, char *argv[]) case 's': silent = 1; break; + case 'a': + passall = 1; + break; default: usage(argv[0]); return 1; -- 2.43.0

1 0

[PATCH] ASoC: sof: amd: fix for firmware reload failure in Vangogh platform
by Venkata Prasad Potturu 18 Jul '24

18 Jul '24

Setting ACP ACLK as clock source when ACP enters D0 state causing firmware load failure, as per design clock source should be internal clock. Remove acp_clkmux_sel field so that ACP will use internal clock source when ACP enters into D0 state. Fixes: d0dab6b76a9f ("ASoC: SOF: amd: Add sof support for vangogh platform") Signed-off-by: Venkata Prasad Potturu <venkataprasad.potturu(a)amd.com> --- sound/soc/sof/amd/pci-vangogh.c | 1 - 1 file changed, 1 deletion(-) diff --git a/sound/soc/sof/amd/pci-vangogh.c b/sound/soc/sof/amd/pci-vangogh.c index 16eb2994fbab..eba580840100 100644 --- a/sound/soc/sof/amd/pci-vangogh.c +++ b/sound/soc/sof/amd/pci-vangogh.c @@ -34,7 +34,6 @@ static const struct sof_amd_acp_desc vangogh_chip_info = { .dsp_intr_base = ACP5X_DSP_SW_INTR_BASE, .sram_pte_offset = ACP5X_SRAM_PTE_OFFSET, .hw_semaphore_offset = ACP5X_AXI2DAGB_SEM_0, - .acp_clkmux_sel = ACP5X_CLKMUX_SEL, .probe_reg_offset = ACP5X_FUTURE_REG_ACLK_0, }; -- 2.39.2

2 1

[PATCH v2] ALSA: usb-audio: Fix microphone sound on HD webcam.
by wangdicheng 18 Jul '24

18 Jul '24

I own an external usb Webcam, HD webcam, which had low mic volume and inconsistent sound quality. Video works as expected. (snip) [ 95.473820][ 1] [ T73] usb 5-2.2: new high-speed USB device number 7 using xhci_hcd [ 95.773974][ 1] [ T73] usb 5-2.2: New USB device found, idVendor=1bcf, idProduct=2281, bcdDevice= 0.05 [ 95.783445][ 1] [ T73] usb 5-2.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 95.791872][ 1] [ T73] usb 5-2.2: Product: HD webcam [ 95.797001][ 1] [ T73] usb 5-2.2: Manufacturer: Sunplus IT Co [ 95.802996][ 1] [ T73] usb 5-2.2: SerialNumber: 20200513 [ 96.092610][ 2] [ T3680] usb 5-2.2: Warning! Unlikely big volume range (=4096), cval->res is probably wrong. [ 96.102436][ 2] [ T3680] usb 5-2.2: [5] FU [Mic Capture Volume] ch = 1, val = 0/4096/1 Set up quirk cval->res to 16 for 256 levels, Set GET_SAMPLE_RATE quirk flag to stop trying to get the sample rate. Confirmed that happened anyway later due to the backoff mechanism, After 3 failures. All audio stream on device interfaces share the same values, apart from wMaxPacketSize and tSamFreq : bLength 9 bDescriptorType 4 bInterfaceNumber 3 bAlternateSetting 4 bNumEndpoints 1 bInterfaceClass 1 Audio Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 3 bAlternateSetting 4 bNumEndpoints 1 bInterfaceClass 1 Audio bInterfaceSubClass 2 Streaming bInterfaceProtocol 0 iInterface 0 AudioStreaming Interface Descriptor: bLength 7 bDescriptorType 36 bDescriptorSubtype 1 (AS_GENERAL) bTerminalLink 3 bDelay 1 frames wFormatTag 0x0001 PCM AudioStreaming Interface Descriptor: bLength 11 bDescriptorType 36 bDescriptorSubtype 2 (FORMAT_TYPE) bFormatType 1 (FORMAT_TYPE_I) bNrChannels 1 bSubframeSize 2 bBitResolution 16 bSamFreqType 1 Discrete tSamFreq[ 0] 48000 Endpoint Descriptor: bLength 9 bDescriptorType 5 bEndpointAddress 0x86 EP 6 IN bmAttributes 5 Transfer Type Isochronous Synch Type Asynchronous Usage Type Data wMaxPacketSize 0x0064 1x 100 bytes bInterval 4 bRefresh 0 bSynchAddress 0 AudioStreaming Endpoint Descriptor: bLength 7 bDescriptorType 37 bDescriptorSubtype 1 (EP_GENERAL) bmAttributes 0x01 Sampling Frequency bLockDelayUnits 0 Undefined wLockDelay 0x0000 (snip) Testing patch provides consistent good sound recording quality and volume range. (snip) [ 95.473820][ 1] [ T73] usb 5-2.2: new high-speed USB device number 7 using xhci_hcd [ 95.773974][ 1] [ T73] usb 5-2.2: New USB device found, idVendor=1bcf, idProduct=2281, bcdDevice= 0.05 [ 95.783445][ 1] [ T73] usb 5-2.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 95.791872][ 1] [ T73] usb 5-2.2: Product: HD webcam [ 95.797001][ 1] [ T73] usb 5-2.2: Manufacturer: Sunplus IT Co [ 95.802996][ 1] [ T73] usb 5-2.2: SerialNumber: 20200513 [ 96.110630][ 3] [ T3680] usbcore: registered new interface driver snd-usb-audio [ 96.114329][ 7] [ T3677] usb 5-2.2: Found UVC 1.00 device HD webcam (1bcf:2281) [ 96.167555][ 7] [ T3677] usbcore: registered new interface driver uvcvideo Signed-off-by: wangdicheng <wangdicheng(a)kylinos.cn> --- V1 -> V2: align the space,Update code to v6.8-rc3,and make modifications based on it --- sound/usb/mixer.c | 7 +++++++ sound/usb/quirks.c | 2 ++ 2 files changed, 9 insertions(+) diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c index 409fc1164694..d1bdb0b93bda 100644 --- a/sound/usb/mixer.c +++ b/sound/usb/mixer.c @@ -1211,6 +1211,13 @@ static void volume_control_quirks(struct usb_mixer_elem_info *cval, cval->res = 16; } break; + case USB_ID(0x1bcf, 0x2281): /* HD Webcam */ + if (!strcmp(kctl->id.name, "Mic Capture Volume")) { + usb_audio_info(chip, + "set resolution quirk: cval->res = 16\n"); + cval->res = 16; + } + break; } } diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c index 09712e61c606..f222532d4d43 100644 --- a/sound/usb/quirks.c +++ b/sound/usb/quirks.c @@ -2185,6 +2185,8 @@ static const struct usb_audio_quirk_flags_table quirk_flags_table[] = { QUIRK_FLAG_ALIGN_TRANSFER), DEVICE_FLG(0x534d, 0x2109, /* MacroSilicon MS2109 */ QUIRK_FLAG_ALIGN_TRANSFER), + DEVICE_FLG(0x1bcf, 0x2281, /* HD Webcam */ + QUIRK_FLAG_GET_SAMPLE_RATE), /* Vendor matches */ VENDOR_FLG(0x045e, /* MS Lifecam */ -- 2.25.1

1 0

[PATCH v1] ALSA: hda/tas2781: Add new quirk for Lenovo Hera2 Laptop
by Shenghao Ding 18 Jul '24

18 Jul '24

Add new vendor_id and subsystem_id in quirk for Lenovo Hera2 Laptop. Signed-off-by: Shenghao Ding <shenghao-ding(a)ti.com> --- sound/pci/hda/patch_realtek.c | 1 + 1 file changed, 1 insertion(+) diff --git a/sound/pci/hda/patch_realtek.c b/sound/pci/hda/patch_realtek.c index 766f0b1d3e9d..bac68a84fd50 100644 --- a/sound/pci/hda/patch_realtek.c +++ b/sound/pci/hda/patch_realtek.c @@ -10539,6 +10539,7 @@ static const struct snd_pci_quirk alc269_fixup_tbl[] = { SND_PCI_QUIRK(0x17aa, 0x231a, "Thinkpad Z16 Gen2", ALC287_FIXUP_MG_RTKC_CSAMP_CS35L41_I2C_THINKPAD), SND_PCI_QUIRK(0x17aa, 0x231e, "Thinkpad", ALC287_FIXUP_LENOVO_THKPAD_WH_ALC1318), SND_PCI_QUIRK(0x17aa, 0x231f, "Thinkpad", ALC287_FIXUP_LENOVO_THKPAD_WH_ALC1318), + SND_PCI_QUIRK(0x17aa, 0x2326, "Hera2", ALC287_FIXUP_TAS2781_I2C), SND_PCI_QUIRK(0x17aa, 0x30bb, "ThinkCentre AIO", ALC233_FIXUP_LENOVO_LINE2_MIC_HOTKEY), SND_PCI_QUIRK(0x17aa, 0x30e2, "ThinkCentre AIO", ALC233_FIXUP_LENOVO_LINE2_MIC_HOTKEY), SND_PCI_QUIRK(0x17aa, 0x310c, "ThinkCentre Station", ALC294_FIXUP_LENOVO_MIC_LOCATION), -- 2.34.1

2 1

[REGRESSION] ALSA: firewire-lib: snd_pcm_period_elapsed deadlock with Fireface 800
by edmund.raile 18 Jul '24

18 Jul '24

On kernels since 5.14.0, ALSA playback to the FireWire RME Fireface 800 audio interface results in a deadlock involving snd_pcm_period_elapsed(), freezing the system. On kernels 5.0.0 to 5.13.19 the interface works just fine, as it does with the RME driver. Distributions tested: Ubuntu Manjaro Arch Fedora FireWire chipsets tested: LSI FW643 TI XIO2213B Platforms tested: Intel i5 4570 on AsRock H97 Pro4 Intel i5 12600K on MSI MS-7D25 The behavior was also observed on the RME forum: https://forum.rme-audio.de/viewtopic.php?pid=190472#p190472 Shortened traces of 6.10.0-rc7 (Arch linux-mainline): RIP: 0010:tasklet_unlock_spin_wait (./arch/x86/include/asm/bitops.h:206 ./arch/x86/include/asm/bitops.h:238 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/softirq.c:851) <NMI> ? watchdog_hardlockup_check.cold (kernel/watchdog.c:200) ? __perf_event_overflow (kernel/events/core.c:9737 (discriminator 2)) ? handle_pmi_common (arch/x86/events/intel/core.c:3061 (discriminator 1)) ? intel_pmu_handle_irq (./arch/x86/include/asm/paravirt.h:192 arch/x86/events/intel/core.c:2428 arch/x86/events/intel/core.c:3127) ? perf_event_nmi_handler (arch/x86/events/core.c:1744 arch/x86/events/core.c:1730) ? nmi_handle (arch/x86/kernel/nmi.c:151) ? default_do_nmi (arch/x86/kernel/nmi.c:352 (discriminator 61)) ? exc_nmi (arch/x86/kernel/nmi.c:546) ? end_repeat_nmi (arch/x86/entry/entry_64.S:1408) ? tasklet_unlock_spin_wait (./arch/x86/include/asm/bitops.h:206 ./arch/x86/include/asm/bitops.h:238 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/softirq.c:851) ? tasklet_unlock_spin_wait (./arch/x86/include/asm/bitops.h:206 ./arch/x86/include/asm/bitops.h:238 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/softirq.c:851) ? tasklet_unlock_spin_wait (./arch/x86/include/asm/bitops.h:206 ./arch/x86/include/asm/bitops.h:238 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/softirq.c:851) </NMI> <TASK> ohci_flush_iso_completions (./include/linux/interrupt.h:740 drivers/firewire/ohci.c:3530) firewire_ohci amdtp_domain_stream_pcm_pointer (sound/firewire/amdtp-stream.c:1858) snd_firewire_lib snd_pcm_update_hw_ptr0 (sound/core/pcm_lib.c:304) snd_pcm snd_pcm_status64 (sound/core/pcm_native.c:1034) snd_pcm snd_pcm_status_user64 (./include/linux/uaccess.h:191 sound/core/pcm_native.c:1096) snd_pcm snd_pcm_ioctl (sound/core/pcm_native.c:3401 (discriminator 1)) snd_pcm __x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:907 fs/ioctl.c:893 fs/ioctl.c:893) do_syscall_64 (arch/x86/entry/common.c:52 (discriminator 1) arch/x86/entry/common.c:83 (discriminator 1)) ? snd_pcm_status_user64 (sound/core/pcm_native.c:1096 (discriminator 1)) snd_pcm ? futex_wake (kernel/futex/waitwake.c:173) ? do_futex (kernel/futex/syscalls.c:107 (discriminator 1)) ? __x64_sys_futex (kernel/futex/syscalls.c:179 kernel/futex/syscalls.c:160 kernel/futex/syscalls.c:160) ? syscall_exit_to_user_mode (kernel/entry/common.c:221) ? do_syscall_64 (./arch/x86/include/asm/cpufeature.h:178 arch/x86/entry/common.c:98) ? do_futex (kernel/futex/syscalls.c:107 (discriminator 1)) ? __x64_sys_futex (kernel/futex/syscalls.c:179 kernel/futex/syscalls.c:160 kernel/futex/syscalls.c:160) ? syscall_exit_to_user_mode (kernel/entry/common.c:221) ? do_syscall_64 (./arch/x86/include/asm/cpufeature.h:178 arch/x86/entry/common.c:98) ? syscall_exit_to_user_mode (kernel/entry/common.c:221) ? do_syscall_64 (./arch/x86/include/asm/cpufeature.h:178 arch/x86/entry/common.c:98) ? do_syscall_64 (./arch/x86/include/asm/cpufeature.h:178 arch/x86/entry/common.c:98) ? __irq_exit_rcu (kernel/softirq.c:620 (discriminator 1) kernel/softirq.c:639 (discriminator 1)) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) RIP: 0010:native_queued_spin_lock_slowpath (kernel/locking/qspinlock.c:380 (discriminator 3)) <NMI> ? watchdog_hardlockup_check.cold (kernel/watchdog.c:200) ? __perf_event_overflow (kernel/events/core.c:9737 (discriminator 2)) ? handle_pmi_common (arch/x86/events/intel/core.c:3061 (discriminator 1)) ? intel_pmu_handle_irq (./arch/x86/include/asm/paravirt.h:192 arch/x86/events/intel/core.c:2428 arch/x86/events/intel/core.c:3127) ? perf_event_nmi_handler (arch/x86/events/core.c:1744 arch/x86/events/core.c:1730) ? nmi_handle (arch/x86/kernel/nmi.c:151) ? default_do_nmi (arch/x86/kernel/nmi.c:352 (discriminator 61)) ? exc_nmi (arch/x86/kernel/nmi.c:546) ? end_repeat_nmi (arch/x86/entry/entry_64.S:1408) ? native_queued_spin_lock_slowpath (kernel/locking/qspinlock.c:380 (discriminator 3)) ? native_queued_spin_lock_slowpath (kernel/locking/qspinlock.c:380 (discriminator 3)) ? native_queued_spin_lock_slowpath (kernel/locking/qspinlock.c:380 (discriminator 3)) </NMI> <IRQ> _raw_spin_lock_irqsave (./arch/x86/include/asm/paravirt.h:584 ./arch/x86/include/asm/qspinlock.h:51 ./include/asm-generic/qspinlock.h:114 ./include/linux/spinlock.h:187 ./include/linux/spinlock_api_smp.h:111 kernel/locking/spinlock.c:162) snd_pcm_period_elapsed (sound/core/pcm_lib.c:1905) snd_pcm process_rx_packets (sound/firewire/amdtp-stream.c:1164) snd_firewire_lib irq_target_callback (sound/firewire/amdtp-stream.c:1549) snd_firewire_lib handle_it_packet (drivers/firewire/ohci.c:2786 drivers/firewire/ohci.c:2974) firewire_ohci context_tasklet (drivers/firewire/ohci.c:1127) firewire_ohci tasklet_action_common.isra.0 (kernel/softirq.c:789) handle_softirqs (kernel/softirq.c:554) __irq_exit_rcu (kernel/softirq.c:589 kernel/softirq.c:428 kernel/softirq.c:637) common_interrupt (arch/x86/kernel/irq.c:278 (discriminator 35)) </IRQ> <TASK> asm_common_interrupt (./arch/x86/include/asm/idtentry.h:693) It can be induced by direct ALSA playback to the device: mpv --audio-device=alsa/sysdefault:CARD=Fireface800 Spor-Ignition.flac Time to occurrence ranges from two seconds to 30 minutes. Loading the CPU appears to increase the likelihood: stress --cpu $(nproc) So does switching between applications via workspaces (only tested Xfce). The regression has been traced to these two commits: 7ba5ca32fe6e8d2e153fb5602997336517b34743 b5b519965c4c364ae65c49fe9f11d222dd70a9c2 I am currently testing a simple patch, in essence reverting both commits. Behaves well so far (stable), will likely send it in tomorrow. #regzbot introduced: 7ba5ca32fe6e

2 2

ThinkPad P14s Gen 5 AMD micmute LED is not working sometimes.
by GitHub issues - opened 18 Jul '24

18 Jul '24

alsa-project/alsa-ucm-conf issue #433 was opened from pma1: The mic and sound output works fine. The mute LED works fine. But when press Fn+F4, the mic-mute led is not working sometimes after bootup. The failrate is like 1/10. Tested with latest alsa-ucm from git, it's reproduced. /sys/class/sound/ctl-led/mic/card1# cat list 7 # amixer -c 1 controls numid=12,iface=CARD,name='Headphone Jack' numid=11,iface=CARD,name='Mic Jack' numid=13,iface=CARD,name='Speaker Phantom Jack' numid=10,iface=MIXER,name='Master Playback Switch' numid=9,iface=MIXER,name='Master Playback Volume' numid=2,iface=MIXER,name='Headphone Playback Switch' numid=1,iface=MIXER,name='Headphone Playback Volume' numid=16,iface=MIXER,name='PCM Playback Volume' numid=17,iface=MIXER,name='Mic ACP LED Capture Switch' numid=8,iface=MIXER,name='Mic Boost Volume' numid=7,iface=MIXER,name='Capture Switch' numid=6,iface=MIXER,name='Capture Volume' numid=5,iface=MIXER,name='Auto-Mute Mode' numid=4,iface=MIXER,name='Speaker Playback Switch' numid=3,iface=MIXER,name='Speaker Playback Volume' numid=15,iface=PCM,name='Capture Channel Map' numid=14,iface=PCM,name='Playback Channel Map' # echo 'Capture Switch' > detach # echo 'Mic ACP LED Capture Switch' > attach /sys/class/sound/ctl-led/mic/card1# cat list 17 Then the micmute LED will work. [alsa-info-amd-micmutled.txt](https://github.com/user-attachments/files/1627… Issue URL : https://github.com/alsa-project/alsa-ucm-conf/issues/433 Repository URL: https://github.com/alsa-project/alsa-ucm-conf

1 0

Inconsistent order of channels on C-Media 7.1 channel device
by victor＠allumeenergy.com.au 18 Jul '24

18 Jul '24

I have a USB sound device (Startech ICUSBAUDIO7D, which comes up as `ID 0d8c:0102 C-Media Electronics, Inc. CM106 Like Sound Device` through lsusb) which I'm trying to program the output of for 8 channels. The python code (outputs a 50Hz sine wave) I'm using is below (each channel gets a different amplitude so I can identify them with an oscilloscope). The sound card has 4 stereo jacks, to which I have a scope connected. The problem is that on different runs of the program, the output mappings are not consistent - each run of the program might have the order of the channels different to the previous. So running it one time might have amplitudes (0, 0.125) on the first jack, but the next run it might have those (0.75, 0.25) on the first jack (it doesn't appear to be 'paired' per jack) I initially discovered this when using portaudio, and decided to try using alsa-only and the issue persists. Is this likely to be a problem with the driver, alsa-lib, or is there something else going on here? ``` import numpy as np import alsaaudio def sine_wave(amplitude=1, freq=50, sample_rate=48000): wave_len = sample_rate/freq samples = (amplitude * 32767 * np.sin(2 * np.pi * np.arange(wave_len) * freq / sample_rate)).astype(np.int16) return samples def eightchan(freq=50, sample_rate=48000): wave_len = sample_rate//freq frames = np.zeros((wave_len, 8), dtype=np.int16) samples = sine_wave() for c in range(8): frames[:wave_len,c] = samples[:wave_len]*(c/8) return frames.tobytes() if __name__ == '__main__': pcm = alsaaudio.PCM(device='surround71:CARD=ICUSBAUDIO7D,DEV=0', format=alsaaudio.PCM_FORMAT_S16_LE, channels=8, rate=48000, type=alsaaudio.PCM_PLAYBACK, periodsize=960, periods=1) frames = eightchan() while True: pcm.write(frames) ``` alsa-info output is attached [alsa-info.txt](https://github.com/user-attachments/files/16277691/alsa-info…

1 1

Inconsistent order of channels on C-Media 7.1 channel device
by GitHub issues - opened 18 Jul '24

18 Jul '24

alsa-project/alsa-lib issue #402 was opened from victorallume: I have a USB sound device (Startech ICUSBAUDIO7D, which comes up as `ID 0d8c:0102 C-Media Electronics, Inc. CM106 Like Sound Device` through lsusb) which I'm trying to program the output of for 8 channels. The python code (outputs a 50Hz sine wave) I'm using is below (each channel gets a different amplitude so I can identify them with an oscilloscope). The sound card has 4 stereo jacks, to which I have a scope connected. The problem is that on different runs of the program, the output mappings are not consistent - each run of the program might have the order of the channels different to the previous. So running it one time might have amplitudes (0, 0.125) on the first jack, but the next run it might have those (0.75, 0.25) on the first jack (it doesn't appear to be 'paired' per jack) I initially discovered this when using portaudio, and decided to try using alsa-only and the issue persists. Is this likely to be a problem with the driver, alsa-lib, or is there something else going on here? ``` import numpy as np import alsaaudio def sine_wave(amplitude=1, freq=50, sample_rate=48000): wave_len = sample_rate/freq samples = (amplitude * 32767 * np.sin(2 * np.pi * np.arange(wave_len) * freq / sample_rate)).astype(np.int16) return samples def eightchan(freq=50, sample_rate=48000): wave_len = sample_rate//freq frames = np.zeros((wave_len, 8), dtype=np.int16) samples = sine_wave() for c in range(8): frames[:wave_len,c] = samples[:wave_len]*(c/8) return frames.tobytes() if __name__ == '__main__': pcm = alsaaudio.PCM(device='surround71:CARD=ICUSBAUDIO7D,DEV=0', format=alsaaudio.PCM_FORMAT_S16_LE, channels=8, rate=48000, type=alsaaudio.PCM_PLAYBACK, periodsize=960, periods=1) frames = eightchan() while True: pcm.write(frames) ``` alsa-info output is attached [alsa-info.txt](https://github.com/user-attachments/files/16277691/alsa-info… Issue URL : https://github.com/alsa-project/alsa-lib/issues/402 Repository URL: https://github.com/alsa-project/alsa-lib

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[PATCH] ALSA: usb-audio: Fix microphone sound on HD webcam.
by wangdicheng 17 Jul '24

17 Jul '24

I own an external usb Webcam, HD webcam, which had low mic volume and inconsistent sound quality. Video works as expected. (snip) [ 95.473820][ 1] [ T73] usb 5-2.2: new high-speed USB device number 7 using xhci_hcd [ 95.773974][ 1] [ T73] usb 5-2.2: New USB device found, idVendor=1bcf, idProduct=2281, bcdDevice= 0.05 [ 95.783445][ 1] [ T73] usb 5-2.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 95.791872][ 1] [ T73] usb 5-2.2: Product: HD webcam [ 95.797001][ 1] [ T73] usb 5-2.2: Manufacturer: Sunplus IT Co [ 95.802996][ 1] [ T73] usb 5-2.2: SerialNumber: 20200513 [ 96.092610][ 2] [ T3680] usb 5-2.2: Warning! Unlikely big volume range (=4096), cval->res is probably wrong. [ 96.102436][ 2] [ T3680] usb 5-2.2: [5] FU [Mic Capture Volume] ch = 1, val = 0/4096/1 Set up quirk cval->res to 16 for 256 levels, Set GET_SAMPLE_RATE quirk flag to stop trying to get the sample rate. Confirmed that happened anyway later due to the backoff mechanism, After 3 failures. All audio stream on device interfaces share the same values, apart from wMaxPacketSize and tSamFreq : bLength 9 bDescriptorType 4 bInterfaceNumber 3 bAlternateSetting 4 bNumEndpoints 1 bInterfaceClass 1 Audio Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 3 bAlternateSetting 4 bNumEndpoints 1 bInterfaceClass 1 Audio bInterfaceSubClass 2 Streaming bInterfaceProtocol 0 iInterface 0 AudioStreaming Interface Descriptor: bLength 7 bDescriptorType 36 bDescriptorSubtype 1 (AS_GENERAL) bTerminalLink 3 bDelay 1 frames wFormatTag 0x0001 PCM AudioStreaming Interface Descriptor: bLength 11 bDescriptorType 36 bDescriptorSubtype 2 (FORMAT_TYPE) bFormatType 1 (FORMAT_TYPE_I) bNrChannels 1 bSubframeSize 2 bBitResolution 16 bSamFreqType 1 Discrete tSamFreq[ 0] 48000 Endpoint Descriptor: bLength 9 bDescriptorType 5 bEndpointAddress 0x86 EP 6 IN bmAttributes 5 Transfer Type Isochronous Synch Type Asynchronous Usage Type Data wMaxPacketSize 0x0064 1x 100 bytes bInterval 4 bRefresh 0 bSynchAddress 0 AudioStreaming Endpoint Descriptor: bLength 7 bDescriptorType 37 bDescriptorSubtype 1 (EP_GENERAL) bmAttributes 0x01 Sampling Frequency bLockDelayUnits 0 Undefined wLockDelay 0x0000 (snip) Testing patch provides consistent good sound recording quality and volume range. (snip) [ 95.473820][ 1] [ T73] usb 5-2.2: new high-speed USB device number 7 using xhci_hcd [ 95.773974][ 1] [ T73] usb 5-2.2: New USB device found, idVendor=1bcf, idProduct=2281, bcdDevice= 0.05 [ 95.783445][ 1] [ T73] usb 5-2.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 95.791872][ 1] [ T73] usb 5-2.2: Product: HD webcam [ 95.797001][ 1] [ T73] usb 5-2.2: Manufacturer: Sunplus IT Co [ 95.802996][ 1] [ T73] usb 5-2.2: SerialNumber: 20200513 [ 96.110630][ 3] [ T3680] usbcore: registered new interface driver snd-usb-audio [ 96.114329][ 7] [ T3677] usb 5-2.2: Found UVC 1.00 device HD webcam (1bcf:2281) [ 96.167555][ 7] [ T3677] usbcore: registered new interface driver uvcvideo Signed-off-by: wangdicheng <wangdicheng(a)kylinos.cn> --- v2 -> v3: Update code to v6.8-rc3,and make modifications based on it V1 -> V2: align the space --- sound/usb/mixer.c | 7 +++++++ sound/usb/quirks.c | 2 ++ 2 files changed, 9 insertions(+) diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c index 409fc1164694..d1bdb0b93bda 100644 --- a/sound/usb/mixer.c +++ b/sound/usb/mixer.c @@ -1211,6 +1211,13 @@ static void volume_control_quirks(struct usb_mixer_elem_info *cval, cval->res = 16; } break; + case USB_ID(0x1bcf, 0x2281): /* HD Webcam */ + if (!strcmp(kctl->id.name, "Mic Capture Volume")) { + usb_audio_info(chip, + "set resolution quirk: cval->res = 16\n"); + cval->res = 16; + } + break; } } diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c index 09712e61c606..f222532d4d43 100644 --- a/sound/usb/quirks.c +++ b/sound/usb/quirks.c @@ -2185,6 +2185,8 @@ static const struct usb_audio_quirk_flags_table quirk_flags_table[] = { QUIRK_FLAG_ALIGN_TRANSFER), DEVICE_FLG(0x534d, 0x2109, /* MacroSilicon MS2109 */ QUIRK_FLAG_ALIGN_TRANSFER), + DEVICE_FLG(0x1bcf, 0x2281, /* HD Webcam */ + QUIRK_FLAG_GET_SAMPLE_RATE), /* Vendor matches */ VENDOR_FLG(0x045e, /* MS Lifecam */ -- 2.25.1

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