Re: [Jack-Devel] from alsa_[in|out] to zita
I've found this thread: http://linuxaudio.org/mailarchive/lad/2013/7/11/200910
and I've read through it. There's a substantial difference between how I start
zita and how the thread OP (IOhannes m zmoelnig) starts it.
I use
zita-j2a -j ploop -v -d hw:0,1 ...
but IOhannes uses hw:Loopback,0,1. So I've switched to his syntax and I think
I've moved one step forward:
zita-j2a -j ploop -v -d hw:Loopback,0,1 -r 48000 -p 64 -L -n 2 &
zita-a2j -j cloop -v -d hw:Loopback,0,1 -r 48000 -p 64 -L -n 2 &
$ aplay /usr/share/sounds/alsa/Front_Center.wav
Playing WAVE '/usr/share/sounds/alsa/Front_Center.wav' : Signed 16 bit Little
Endian, Rate 48000 Hz, Mono
e.g. no more errors, except I don't hear anything... well, to be honest I do
hear something: if I speak into the mic, I can hear myself into the
headphones, and that's great. I still can't hear anything from alsa
applications.
I don't know if it helps, however here is the hw params output:
$ aplay --device=hw:Loopback,0 --dump-hw-params
/usr/share/sounds/alsa/Front_Center.wav
Playing WAVE '/usr/share/sounds/alsa/Front_Center.wav' : Signed 16 bit Little
Endian, Rate 48000 Hz, Mono
HW Params of device "hw:Loopback,0":
--------------------
ACCESS: MMAP_INTERLEAVED RW_INTERLEAVED
FORMAT: S16_LE S16_BE S32_LE S32_BE FLOAT_LE FLOAT_BE
SUBFORMAT: STD
SAMPLE_BITS: [16 32]
FRAME_BITS: [16 1024]
CHANNELS: [1 32]
RATE: [8000 192000]
PERIOD_TIME: (5 65536000]
PERIOD_SIZE: [1 524288]
PERIOD_BYTES: [64 1048576]
PERIODS: [1 1024]
BUFFER_TIME: (5 131072000]
BUFFER_SIZE: [1 1048576]
BUFFER_BYTES: [64 2097152]
TICK_TIME: ALL
--------------------
but the same command, without specifying the device, gives:
$ aplay --dump-hw-params /usr/share/sounds/alsa/Front_Center.wav
Playing WAVE '/usr/share/sounds/alsa/Front_Center.wav' : Signed 16 bit Little
Endian, Rate 48000 Hz, Mono
HW Params of device "default":
--------------------
ACCESS: MMAP_INTERLEAVED MMAP_NONINTERLEAVED MMAP_COMPLEX RW_INTERLEAVED
RW_NONINTERLEAVED
FORMAT: S8 U8 S16_LE S16_BE U16_LE U16_BE S24_LE S24_BE U24_LE U24_BE S32_LE
S32_BE U32_LE U32_BE FLOAT_LE FLOAT_BE FLOAT64_LE FLOAT64_BE MU_LAW A_LAW
IMA_ADPCM S24_3LE S24_3BE U24_3LE U24_3BE S20_3LE S20_3BE U20_3LE U20_3BE
S18_3LE S18_3BE U18_3LE U18_3BE
SUBFORMAT: STD
SAMPLE_BITS: [4 64]
FRAME_BITS: [4 640000]
CHANNELS: [1 10000]
RATE: [4000 4294967295)
PERIOD_TIME: (85331 85332)
PERIOD_SIZE: (341 366498150)
PERIOD_BYTES: (170 4294967295)
PERIODS: (0 2149583)
BUFFER_TIME: [1 4294967295]
BUFFER_SIZE: [682 733007751]
BUFFER_BYTES: [341 4294967295]
TICK_TIME: ALL
--------------------
i.e. totally different params... wasn't my Loopback device supposed to be the
default one?
$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: Loopback [Loopback], device 0: Loopback PCM [Loopback PCM]
Subdevices: 1/2
Subdevice #0: subdevice #0
Subdevice #1: subdevice #1
card 0: Loopback [Loopback], device 1: Loopback PCM [Loopback PCM]
Subdevices: 2/2
Subdevice #0: subdevice #0
Subdevice #1: subdevice #1
card 1: SB [HDA ATI SB], device 0: ALC892 Analog [ALC892 Analog]
Subdevices: 0/1
Subdevice #0: subdevice #0
card 1: SB [HDA ATI SB], device 1: ALC892 Digital [ALC892 Digital]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 2: Generic [HD-Audio Generic], device 3: HDMI 0 [HDMI 0]
Subdevices: 1/1
Subdevice #0: subdevice #0
1388773043.31904_0.ltw:2, <2688150.aoZGMJ3bMN at fx>