[alsa-devel] Unable to open CAPTURE device
Hello,
I have connected ipod to my hardware (using USB) and i want to read the audio pcm data from ipod. I am running following section of code to detect connection of ipod. But i am not finding any capture device connected. Am i giving some wrong name of capture device ? If wrong how can i find correct name of Audio Capture device.
/***********************************************************************************************************************************************/ const char *capture_device="plughw:1,0";
while((retVal = snd_pcm_open( &pcm_capture, (const char *)capture_device, SND_PCM_STREAM_CAPTURE, 1))!=0) { if (retVal != 0){ printf("Opening Capture device FAILED\n"); printf("Still waiting for Capture device to be connected\n"); usleep(5000); } } /***********************************************************************************************************************************************/ OUTPUT :
Opening Capture device FAILED Still waiting for Capture device to be connected ALSA lib pcm_hw.c:1433:(_snd_pcm_hw_open) Invalid value for card Opening Capture device FAILED Still waiting for Capture device to be connected ALSA lib pcm_hw.c:1433:(_snd_pcm_hw_open) Invalid value for card Opening Capture device FAILED Still waiting for Capture device to be connected ALSA lib pcm_hw.c:1433:(_snd_pcm_hw_open) Invalid value for card Opening Capture device FAILED Still waiting for Capture device to be connected ALSA lib pcm_hw.c:1433:(_snd_pcm_hw_open) Invalid value for card Opening Capture device FAILED Still waiting for Capture device to be connected . . . . . . . /*Continues*/ . . . . . . . . . . . . .
Regards
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Irfan Shaikh wrote:
I have connected ipod to my hardware (using USB) and i want to read the audio pcm data from ipod. I am running following section of code to detect connection of ipod. But i am not finding any capture device connected.
The iPod is not a USB audio capture device.
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But Since ipod is connected using USB interface (USB Audio Class device). Wont it be treated as USB Audio capture device ?
________________________________________ From: Clemens Ladisch [clemens@ladisch.de] Sent: Tuesday, November 30, 2010 3:26 PM To: Irfan Shaikh Cc: alsa-devel@alsa-project.org Subject: Re: [alsa-devel] Unable to open CAPTURE device
Irfan Shaikh wrote:
I have connected ipod to my hardware (using USB) and i want to read the audio pcm data from ipod. I am running following section of code to detect connection of ipod. But i am not finding any capture device connected.
The iPod is not a USB audio capture device.
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Now i am able to open ipod as capture device. The problem was ipod was been shown as the mass storage device (/dev/sda1). //snd_pcm_open was failing I reconfigured my ipod so that is is being showed as usbaudio class device. // Works fine now
Thanks for your inputs, Regards Irfan ________________________________________ From: Clemens Ladisch [clemens@ladisch.de] Sent: Tuesday, November 30, 2010 9:05 PM To: Irfan Shaikh Cc: alsa-devel@alsa-project.org Subject: Re: [alsa-devel] Unable to open CAPTURE device
Irfan Shaikh wrote:
But Since ipod is connected using USB interface (USB Audio Class device). Wont it be treated as USB Audio capture device ?
In that case, yes.
Does the device show up in /proc/asound/cards?
Regards, Clemens
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participants (2)
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Clemens Ladisch -
Irfan Shaikh