Hi all / Takashi,
I saw Takashi has a patch for this question: https://www.mail-archive.com/alsa-user@lists.sourceforge.net/msg25548.html But I still have this issue when I use “hooks” and “dmix” plugin in my asound.conf. I am using alsa-lib and utils 1.1.9. Aplay –v xxx.wav from one console and aplay –v yyy.wav from another console. Can Takashi or any other one help? Thanks! My asound.conf is: pcm.dmix_44 { type dmix slave.pcm "spk_stereo" ipc_key 321456 # any unique value ipc_key_add_uid true slave { pcm "hw:0" format S32_LE rate 44100 } } pcm.spk_stereo { type hw card "MapleLeaf" device 0 format S32_LE } pcm.playback { type hooks slave.pcm "dmix_44" hooks.0 { type ctl_elems hook_args [ { name "HPL Output Mixer L_DAC Switch" preserve true lock true value true } { name "HPR Output Mixer R_DAC Switch" preserve true lock true value true } { name "HP DAC Playback Switch" preserve true lock true value [ 1 1 ] } { name "HP Driver Gain Volume" preserve true lock true value [ 6 6 ] #[6 6]=0dB, [3 3]=-3dB } { name "REF Power-up Cfg" preserve true lock true value 1 #40ms } ] } } pcm.hooks { type asym playback.pcm "playback" capture.pcm "capture" } pcm.!default { type plug slave.pcm "hooks" } First aplay play out music. Second failed as: # aplay LRMonoPhase4.wav Playing WAVE 'LRMonoPhase4.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo ALSA lib setup.c:96:(snd_sctl_install) Cannot lock ctl elem aplay: set_params:1403: Unable to install hw params: ACCESS: RW_INTERLEAVED FORMAT: S16_LE SUBFORMAT: STD SAMPLE_BITS: 16 FRAME_BITS: 32 CHANNELS: 2 RATE: 48000 PERIOD_TIME: (23129 23130) PERIOD_SIZE: [1110 1110] PERIOD_BYTES: (4440 4444) PERIODS: (2 3) BUFFER_TIME: 69375 BUFFER_SIZE: 3330 BUFFER_BYTES: 13320 TICK_TIME: 0 1st aplay shows: # aplay -v Hotel_California.wav Playing WAVE 'Hotel_California.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo Plug PCM: Linear conversion PCM (S32_LE) Its setup is: stream : PLAYBACK access : RW_INTERLEAVED format : S16_LE subformat : STD channels : 2 rate : 44100 exact rate : 44100 (44100/1) msbits : 16 buffer_size : 3060 period_size : 1020 period_time : 23129 tstamp_mode : NONE tstamp_type : MONOTONIC period_step : 1 avail_min : 1020 period_event : 0 start_threshold : 3060 stop_threshold : 3060 silence_threshold: 0 silence_size : 0 boundary : 1604321280 Slave: Hooks PCM Its setup is: stream : PLAYBACK access : MMAP_INTERLEAVED format : S32_LE subformat : STD channels : 2 rate : 44100 exact rate : 44100 (44100/1) msbits : 32 buffer_size : 3060 period_size : 1020 period_time : 23129 tstamp_mode : NONE tstamp_type : MONOTONIC period_step : 1 avail_min : 1020 period_event : 0 start_threshold : 3060 stop_threshold : 3060 silence_threshold: 0 silence_size : 0 boundary : 1604321280 Slave: Direct Stream Mixing PCM Its setup is: stream : PLAYBACK access : MMAP_INTERLEAVED format : S32_LE subformat : STD channels : 2 rate : 44100 exact rate : 44100 (44100/1) msbits : 32 buffer_size : 3060 period_size : 1020 period_time : 23129 tstamp_mode : NONE tstamp_type : MONOTONIC period_step : 1 avail_min : 1020 period_event : 0 start_threshold : 3060 stop_threshold : 3060 silence_threshold: 0 silence_size : 0 boundary : 1604321280 Hardware PCM card 0 'MapleLeaf' device 0 subdevice 0 Its setup is: stream : PLAYBACK access : MMAP_INTERLEAVED format : S32_LE subformat : STD channels : 2 rate : 44100 exact rate : 44100 (44100/1) msbits : 32kasho buffer_size : 3060 period_size : 1020 period_time : 23129 tstamp_mode : ENABLE tstamp_type : MONOTONIC period_step : 1 avail_min : 1020 period_event : 0 start_threshold : 1 stop_threshold : 1604321280 silence_threshold: 0 silence_size : 1604321280 boundary : 1604321280 appl_ptr : 0 hw_ptr : 13260 Regards! Kevin
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