[linux-audio-dev] OSS, Sound playback too fast

Hello list, before someone tells me to use ALSA - the AC97 codec on my Arm-Board does not work wit ALSA according to the distributor... so it seems I have to stick with OSS. I opened a 16 bit 44100 wav-file with libsndfile and wrote the PCM to a buffer. Then I configure the card with 16 bit NE, 44100 and with 5 fragments of the size of 2048 bytes. According to the readback values, all data was set by OSS. In my main loop I use SNDCTL_DSP_GETOSPACE to poll the buffer. Whenever it shows free fragments, I write more data to the card. What I experience is that playback is too fast. I can make it slower by reducing the buffer-size or by setting a very high usleep value so that all fragments practically stay free. There is a precompiled madplayer on the device and it plays perfectly... can someone give me a hint what went wrong? Thanks! Tobias