From 2e416ee0095f1bf608f849f156d564e0f45fb8ab Mon Sep 17 00:00:00 2001 From: Guenter Geiger Date: Mon, 2 Feb 2004 12:18:59 +0000 Subject: merged in version_0_37_1test6 svn path=/trunk/; revision=1305 --- pd/portaudio/docs/pa_tut_devs.html | 65 -------------------------------------- 1 file changed, 65 deletions(-) delete mode 100644 pd/portaudio/docs/pa_tut_devs.html (limited to 'pd/portaudio/docs/pa_tut_devs.html') diff --git a/pd/portaudio/docs/pa_tut_devs.html b/pd/portaudio/docs/pa_tut_devs.html deleted file mode 100644 index 1756992c..00000000 --- a/pd/portaudio/docs/pa_tut_devs.html +++ /dev/null @@ -1,65 +0,0 @@ - - - - - - - - - PortAudio Tutorial - - -  -
- - - -
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-

-PortAudio Tutorial

-
- -

-Querying for Available Devices

- -
There are often several different audio devices available in -a computer with different capabilities. They can differ in the sample rates -supported, bit widths, etc. PortAudio provides a simple way to query for -the available devices, and then pass the selected device to Pa_OpenStream(). -For an example, see the file "pa_tests/pa_devs.c". -

To determine the number of devices: -

-
numDevices = Pa_CountDevices();
-
-You can then query each device in turn by calling Pa_GetDeviceInfo() with -an index. -
-
for( i=0; i<numDevices; i++ ) {
-     pdi = Pa_GetDeviceInfo( i );
-
-It will return a pointer to a PaDeviceInfo structure which is -defined as: -
-
typedef struct{
-    int structVersion; 
-    const char *name;
-    int maxInputChannels;
-    int maxOutputChannels;
-/* Number of discrete rates, or -1 if range supported. */
-    int numSampleRates;
-/* Array of supported sample rates, or {min,max} if range supported. */
-    const double *sampleRates;
-    PaSampleFormat nativeSampleFormat;
-}PaDeviceInfo;
-
-If the device supports a continuous range of sample rates, then numSampleRates -will equal -1, and the sampleRates array will have two values, the minimum  -and maximum rate. -

The device information is allocated by Pa_Initialize() and freed by -Pa_Terminate() so you do not have to free() the structure returned by Pa_GetDeviceInfo().

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