Ok so the error that I got come from a bad SPI configuration in my code. But I have an other problem now.
I can play a file on my sd card but the play rate is really too low, it's like a "slow-motion" but for a song (RATE = 8000 Hz display in the visual output)
How can I speed it up ? (I'm sorry I don't understand perfectly your playstream function hanzibal ^^")