Arve Knudsen <[EMAIL PROTECTED]> writes:
>>>>
>>>> My ALSA card is quite capable of doing 44100
>>>>
>>> Can you verify that the ALSA API is in use, after configuring out OSS
>>> and
>>> JACK? I cannot see why this test should fail, granted your card supports
>>> the given samplerate. If you could be bothered, perhaps you could add
>>> some
>>> debug output to function SetApproximateSampleRate at
>>> pa_linux_alsa/pa_linux_alsa.c: 1575? Ie. you could verify that the
>>> correct
>>> samplerate is indeed passed to ALSA-lib, and that ALSA-lib rejects it.
>>
>> SetApproximateSampleRate is @ line 1583 in my copy:
>> Making that :
>>
>> err = snd_pcm_hw_params_set_rate( pcm, hwParams, approx, dir );
>> printf("%s approx=%lu rate=%d dir=%d\n",
>> __FUNCTION__,approx, err, dir);
>>
>> return err;
>>
>> Yields:
>>
>> [EMAIL PROTECTED]:~/portaudio> bin/patest_sine_formats
>> PortAudio Test: output Signed 16 Bit
>> SetApproximateSampleRate approx=44100 rate=-22 dir=0
>> Host API: ALSA
>> An error occured while using the portaudio stream
>> Error number: -9997
>> Error message: Invalid sample rate
>> [EMAIL PROTECTED]:~/portaudio>
>>
>> Which seems sane. Changing it to:
>>
>> err = snd_pcm_hw_params_set_rate_near( pcm, hwParams, &approx, &dir
>> );
>> printf("%s approx=%lu rate=%d dir=%d\n",
>> __FUNCTION__,approx, err, dir);
>>
>> return err;
>>
>> Yields:
>>
>> [EMAIL PROTECTED]:~/portaudio> bin/patest_sine_formats
>> PortAudio Test: output Signed 16 Bit
>> SetApproximateSampleRate approx=48000 rate=0 dir=0
>> Host API: ALSA
>> Waiting 10 seconds for sound to finish.
>> PortAudio Test Finished: Signed 16 Bit
>>
>> So perhaps my card does _NOT_ support 44100Hz after all.
>> This is the card as autodetected/configured by SuSE9.0's YaST.
>> Seems there are options to play with including the clock rate
>> but I don't know what I am doing ...
>>
>It looks like you got PortAudio working at least :)
Well if you consider 48000 "near" 44100 ...
>You can also look up
>the PaDeviceInfo struct for any device, to check out the default sample
>rate. I think the ALSA plughw device will convert the samplerate to a
>hardware supported one for you, so that might be your best bet?
I think so - googling for 8235 and 44100 shows I am not the 1st to
have this kind of problem...
>I have
>never used the PCM plugin myself, but its possible to specify a custom
>device string with pa_linux_alsa. If you look in the pa_linux_alsa.h file,
>you'll see a custom stream structure, PaAlsaStreamInfo, which basically
>can be used like this:
>PaAlsaStreamInfo alsaStreamInfo;
>PaStreamParameters outputParameters;
>
>PaAlsa_InitializeStreamInfo(&alsaStreamInfo);
>alsaStreamInfo.deviceString = "plughw:0,0";
>
>outputParameters.device = paUseHostApiSpecificDeviceSpecification;
>outputParameters.hostApiSpecificStreamInfo = &alsaStreamInfo;
>
>It's device string will then be used when opening the output device.
But having a custom string then means I need to know that
A. PortAudio is using ALSA
B. This user's ALSA hw device cannot do my rate
C. Which magic custom string to use.
If I need to know that much I might as well use native ALSA code...
Surely the whole point of PortAudio is that app says
"open sound card for 44100Hz, 16-bit, 2 channels"
and the PortAudio layer figures out how to do that?
>
>Hope this helps
>
>Arve Knudsen
>
>
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