Open Sound System
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int channels=Number of Channels;
ioctl(fd, SNDCTL_DSP_CHANNELS, &channels);
The above code fragment lacks all error checks for clarity. Real world applications must always check for the errors and handle them as described below. Also most OSS ioctl calls will return information in the argument variable and it's usually necessary to check it too.
Please look at the When OSS audio ioctl calls can be made section for information about DSP ioctl call ordering.
The return value from the OSS ioctl calls will be -1 if a fatal error occurred. Other values mean that the ioctl call was more or less successful. However in most cases the application must check the value returned in the argument to see what was the accepted value.
Please see the Possible error codes (errno) returned by OSS calls section for more info about the error codes returned by OSS.
|osstest.c||The osstest program shipped with OSS|
|ossplay.c||Sources for the ossplay audio player and for the ossrecord|
|fulldup.c||Full duplex sample program using the single device approach.|
|mmap_duplex.c||A simple sample program for doing dull duplex using mmap|
|mmap_test.c||A sample program for using mmap()|
|singen.c||A simple audio playback program that plays continuous 1 kHz sine wave.|
|audiolevel.c||A simple program that does audio recording.|
|dsp_geterror_demo.c||A simple demonstration of|
|iosync.c||Measuring the hardware level latencies.|
|sweepdown.c||Plays a funny synthetic engine stop sound|
|multich32.c||Source file oss-testing/tutorials/sndkit/tests/multich32.c|
|sweepup.c||A simple program that plays frequency sweep from 10 Hz to fs/2.|
|multich16.c||Source file oss-testing/tutorials/sndkit/tests/multich16.c|
|ioctl_test.c||This program has been used to verify that some of the ioctl calls work|
|spdif_in_debug.c||A program that prints the S/PDIF receiver status.|
|softsynth_gtk.c||A simple software MIDI synthesizer program with GTK GUI.|
|softsynth.c||A simple software MIDI synthesizer program.|