Hi,I have changed them as a same value 22050,like this: MIN_SAMPLE_RATE 22050 // Min Sample Rate MAX_SAMPLE_RATE 22050 // Max Sample Rate But it doesn't work. When I change sample rate in the 'SetFormat', only the header changed, when play a wav file, it is very slow of very fast. Si Gang <sigangllj@xxxxxxxxx> 写道: Hi, Maybe you can search MIN_SAMPLE_RATE and MAX_SAMPLE_RATE in your code and modify them as follows. #define MIN_SAMPLE_RATE 8000 // Min Sample Rate #define MAX_SAMPLE_RATE 96000 // Max Sample Rate Best wishes Gaby --------------------------------- 雅虎邮箱传递新年祝福,个性贺卡送亲朋!