19 Feb
2009
19 Feb
'09
7:42 a.m.
At Thu, 19 Feb 2009 13:20:16 +0800, Wu Fengguang wrote:
Hi Takashi,
I noticed that 'appl_ptr' is always 0 during playback, whether it be mplayer or aplay, T61 or DG45ID. Is this a bug?
No, it's a feature. When you use dmix, the appl_ptr isn't updated in the driver side but the driver is running in a "free-wheel" mode. OTOH, if you use pulseaudio or use HDMI out, the device is opened in a normal mode, thus appl_ptr is handled in the driver side.
Takashi
% grep -r . /proc/asound/card0/pcm0p /proc/asound/card0/pcm0p/sub0/prealloc_max:32768 /proc/asound/card0/pcm0p/sub0/prealloc:64 /proc/asound/card0/pcm0p/sub0/status:state: RUNNING /proc/asound/card0/pcm0p/sub0/status:trigger_time: 260.550520867 /proc/asound/card0/pcm0p/sub0/status:tstamp : 264.361429403 /proc/asound/card0/pcm0p/sub0/status:delay : -182952 /proc/asound/card0/pcm0p/sub0/status:avail : 191144 /proc/asound/card0/pcm0p/sub0/status:avail_max : 191144 /proc/asound/card0/pcm0p/sub0/status:----- /proc/asound/card0/pcm0p/sub0/status:hw_ptr : 182952 /proc/asound/card0/pcm0p/sub0/status:appl_ptr : 0 /proc/asound/card0/pcm0p/sub0/sw_params:tstamp_mode: ENABLE /proc/asound/card0/pcm0p/sub0/sw_params:period_step: 1 /proc/asound/card0/pcm0p/sub0/sw_params:avail_min: 1024 /proc/asound/card0/pcm0p/sub0/sw_params:start_threshold: 1 /proc/asound/card0/pcm0p/sub0/sw_params:stop_threshold: 4611686018427387904 /proc/asound/card0/pcm0p/sub0/sw_params:silence_threshold: 0 /proc/asound/card0/pcm0p/sub0/sw_params:silence_size: 4611686018427387904 /proc/asound/card0/pcm0p/sub0/sw_params:boundary: 4611686018427387904 /proc/asound/card0/pcm0p/sub0/hw_params:access: MMAP_INTERLEAVED /proc/asound/card0/pcm0p/sub0/hw_params:format: S32_LE /proc/asound/card0/pcm0p/sub0/hw_params:subformat: STD /proc/asound/card0/pcm0p/sub0/hw_params:channels: 2 /proc/asound/card0/pcm0p/sub0/hw_params:rate: 48000 (48000/1) /proc/asound/card0/pcm0p/sub0/hw_params:period_size: 1024 /proc/asound/card0/pcm0p/sub0/hw_params:buffer_size: 8192 /proc/asound/card0/pcm0p/sub0/info:card: 0 /proc/asound/card0/pcm0p/sub0/info:device: 0 /proc/asound/card0/pcm0p/sub0/info:subdevice: 0 /proc/asound/card0/pcm0p/sub0/info:stream: PLAYBACK /proc/asound/card0/pcm0p/sub0/info:id: STAC92xx Analog /proc/asound/card0/pcm0p/sub0/info:name: STAC92xx Analog /proc/asound/card0/pcm0p/sub0/info:subname: subdevice #0 /proc/asound/card0/pcm0p/sub0/info:class: 0 /proc/asound/card0/pcm0p/sub0/info:subclass: 0 /proc/asound/card0/pcm0p/sub0/info:subdevices_count: 1 /proc/asound/card0/pcm0p/sub0/info:subdevices_avail: 0 /proc/asound/card0/pcm0p/xrun_debug:0 /proc/asound/card0/pcm0p/info:card: 0 /proc/asound/card0/pcm0p/info:device: 0 /proc/asound/card0/pcm0p/info:subdevice: 0 /proc/asound/card0/pcm0p/info:stream: PLAYBACK /proc/asound/card0/pcm0p/info:id: STAC92xx Analog /proc/asound/card0/pcm0p/info:name: STAC92xx Analog /proc/asound/card0/pcm0p/info:subname: subdevice #0 /proc/asound/card0/pcm0p/info:class: 0 /proc/asound/card0/pcm0p/info:subclass: 0 /proc/asound/card0/pcm0p/info:subdevices_count: 1 /proc/asound/card0/pcm0p/info:subdevices_avail: 0Interestingly DG45ID HDMI audio playback does not have this problem:
/proc/asound/card0/pcm3p/sub0/prealloc_max:32768 /proc/asound/card0/pcm3p/sub0/prealloc:64 /proc/asound/card0/pcm3p/sub0/status:state: RUNNING /proc/asound/card0/pcm3p/sub0/status:trigger_time: 441.375970806 /proc/asound/card0/pcm3p/sub0/status:tstamp : 447.039903859 /proc/asound/card0/pcm3p/sub0/status:delay : 16096 /proc/asound/card0/pcm3p/sub0/status:avail : 288 /proc/asound/card0/pcm3p/sub0/status:avail_max : 288 /proc/asound/card0/pcm3p/sub0/status:----- /proc/asound/card0/pcm3p/sub0/status:hw_ptr : 249824 /proc/asound/card0/pcm3p/sub0/status:appl_ptr : 265920 /proc/asound/card0/pcm3p/sub0/sw_params:tstamp_mode: NONE /proc/asound/card0/pcm3p/sub0/sw_params:period_step: 1 /proc/asound/card0/pcm3p/sub0/sw_params:avail_min: 1024 /proc/asound/card0/pcm3p/sub0/sw_params:start_threshold: 1024 /proc/asound/card0/pcm3p/sub0/sw_params:stop_threshold: 4611686018427387904 /proc/asound/card0/pcm3p/sub0/sw_params:silence_threshold: 0 /proc/asound/card0/pcm3p/sub0/sw_params:silence_size: 4611686018427387904 /proc/asound/card0/pcm3p/sub0/sw_params:boundary: 4611686018427387904 /proc/asound/card0/pcm3p/sub0/hw_params:access: RW_INTERLEAVED /proc/asound/card0/pcm3p/sub0/hw_params:format: S16_LE /proc/asound/card0/pcm3p/sub0/hw_params:subformat: STD /proc/asound/card0/pcm3p/sub0/hw_params:channels: 2 /proc/asound/card0/pcm3p/sub0/hw_params:rate: 44100 (44100/1) /proc/asound/card0/pcm3p/sub0/hw_params:period_size: 1024 /proc/asound/card0/pcm3p/sub0/hw_params:buffer_size: 16384 /proc/asound/card0/pcm3p/sub0/info:card: 0 /proc/asound/card0/pcm3p/sub0/info:device: 3 /proc/asound/card0/pcm3p/sub0/info:subdevice: 0 /proc/asound/card0/pcm3p/sub0/info:stream: PLAYBACK /proc/asound/card0/pcm3p/sub0/info:id: INTEL HDMI /proc/asound/card0/pcm3p/sub0/info:name: INTEL HDMI /proc/asound/card0/pcm3p/sub0/info:subname: subdevice #0 /proc/asound/card0/pcm3p/sub0/info:class: 0 /proc/asound/card0/pcm3p/sub0/info:subclass: 0 /proc/asound/card0/pcm3p/sub0/info:subdevices_count: 1 /proc/asound/card0/pcm3p/sub0/info:subdevices_avail: 0 /proc/asound/card0/pcm3p/xrun_debug:0 /proc/asound/card0/pcm3p/info:card: 0 /proc/asound/card0/pcm3p/info:device: 3 /proc/asound/card0/pcm3p/info:subdevice: 0 /proc/asound/card0/pcm3p/info:stream: PLAYBACK /proc/asound/card0/pcm3p/info:id: INTEL HDMI /proc/asound/card0/pcm3p/info:name: INTEL HDMI /proc/asound/card0/pcm3p/info:subname: subdevice #0 /proc/asound/card0/pcm3p/info:class: 0 /proc/asound/card0/pcm3p/info:subclass: 0 /proc/asound/card0/pcm3p/info:subdevices_count: 1 /proc/asound/card0/pcm3p/info:subdevices_avail: 0Thanks, Fengguang