SDL_Mixer noise in linux

SDL Development
1

hello

When i play a wave file with sdl_mixer, I hear is a staticy noise. but when
i used the sdl directly, it sound well.
i test the player with Ubuntu and fedora 8, both sound badly.
Thank you in advance.

my player source code as follows, it use sdl_mixer library
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <SDL/SDL.h>
#include <SDL/SDL_mixer.h>

static int play_over = 0;
void channel_finished(int channel)
{
play_over = 1;
}

int main(int argc, char* argv[])
{
SDL_Surface* screen = NULL;
SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO);

struct
{
    SDL_AudioSpec spec;
    Uint8   *sound; /* Pointer to wave data */
    Uint32   soundlen; /* Length of wave data */
    int      soundpos; /* Current play position */
}wave;

SDL_LoadWAV("sample.wav", &wave.spec, &wave.sound, &wave.soundlen);
SDL_FreeWAV(wave.sound);

if(Mix_OpenAudio(wave.spec.freq, wave.spec.format, wave.spec.channels,

wave.spec.samples))
{
printf(“Unable to open audio!\n”);
exit(1);
}

int freq, format, channels;
Mix_QuerySpec(&freq, (unsigned short int*)&format, &channels);
fprintf(stderr, "<freq: %d vs %d>|<format: %d vs %d>|<channels: %d vs

%d>",
wave.spec.freq, freq, wave.spec.format, format,
wave.spec.channels, channels);

Mix_AllocateChannels(1);
Mix_ChannelFinished(channel_finished);

/* Pre-load sound effects */
Mix_Chunk* mixChunk = Mix_LoadWAV("sample.wav");
mixChunk->volume = 64;

screen = SDL_SetVideoMode(320, 240, 0, 0);

char name[32];
printf("Using audio driver: %s\n", SDL_AudioDriverName(name, 32));

Mix_PlayChannel(0, mixChunk, 2);  // you can change 2 to any times

while(play_over == 0)
{
    usleep(20 * 1000);
}

Mix_FreeChunk(mixChunk);
Mix_CloseAudio();
SDL_Quit();
return 0;

}

gcc -g -o sMixer sMixer.c -lSDL -lSDL_mixer