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?
% 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: 0
Interestingly 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: 0
Thanks,
Fengguang
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