1. wav转MP3示例程序代码：

/*

gcc -I /usr/include/lame/ lame_test.c -lmp3lame -o lame_test -lm

*/#include

#include

#include

#define INBUFSIZE 4096

#define MP3BUFSIZE (int) (1.25 * INBUFSIZE) + 7200

int encode(char* inPath, char* outPath) {

int status = 0;

lame_global_flags* gfp;

int ret_code;

FILE* infp;

FILE* outfp;

short* input_buffer;

int input_samples;

char* mp3_buffer;

int mp3_bytes;

gfp = lame_init();

if (gfp == NULL) {

printf("lame_init failed/n");

status = -1;

goto exit;

}

ret_code = lame_init_params(gfp);

if (ret_code < 0) {

printf("lame_init_params returned %d/n",ret_code);

status = -1;

goto close_lame;

}

infp = fopen(inPath, "rb");

outfp = fopen(outPath, "wb");

input_buffer = (short*)malloc(INBUFSIZE*2);

mp3_buffer = (char*)malloc(MP3BUFSIZE);

do{

input_samples = fread(input_buffer, 2, INBUFSIZE, infp);

//fprintf(stderr, "input_samples is %d./n", input_samples);

mp3_bytes = lame_encode_buffer_interleaved(gfp, input_buffer,input_samples/2, mp3_buffer, MP3BUFSIZE);

//fprintf(stderr, "mp3_bytes is %d./n", mp3_bytes);

if (mp3_bytes < 0) {

printf("lame_encode_buffer_interleaved returned %d/n", mp3_bytes);

status = -1;

goto free_buffers;

} else if(mp3_bytes > 0) {

fwrite(mp3_buffer, 1, mp3_bytes, outfp);

}

}while (input_samples == INBUFSIZE);

mp3_bytes = lame_encode_flush(gfp, mp3_buffer, sizeof(mp3_buffer));

if (mp3_bytes > 0) {

printf("writing %d mp3 bytes/n", mp3_bytes);

fwrite(mp3_buffer, 1, mp3_bytes, outfp);

}

free_buffers:

free(mp3_buffer);

free(input_buffer);

fclose(outfp);

fclose(infp);

close_lame:

lame_close(gfp);

exit:

return status;

}

int main(int argc, char** argv) {

if (argc < 3) {

printf("usage: lame_test rawinfile mp3outfile/n");

}

encode(argv[1], argv[2]);

return 0;

}

2. 录音成MP3格式程序代码：

/*

gcc -I /usr/include/lame/ -lmp3lame -o mp3_record mp3_record.c -lm

*/

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include "lame.h"

#define BUFF_SIZE 512

#define INBUFF_SIZE 4096

#define MP3BUFF_SIZE (int) (1.25 * INBUFF_SIZE) + 7200

static int run=1;

static void stop(int signum){

fprintf(stderr, "exit/n");

run=0;

}

int SetFormat(int fd, unsigned int bit, unsigned int channel, unsigned int hz)

{

int ioctl_val;

/* set bit format */

ioctl_val = bit;

if(ioctl(fd, SNDCTL_DSP_SETFMT, &ioctl_val) < 0){

fprintf(stderr, "Set fmt to bit %d failed:%s/n", bit, strerror(errno));

return -1;

}

if (ioctl_val != bit) {

fprintf(stderr, "do not support bit %d, supported %d/n", bit,ioctl_val);

return (-1);

}

/*set channel */

ioctl_val = channel;

if ((ioctl(fd, SNDCTL_DSP_CHANNELS, &ioctl_val)) == -1) {

fprintf(stderr, "Set Audio Channels %d failed:%s/n", channel, strerror(errno));

return (-1);

}

if (ioctl_val != channel) {

fprintf(stderr, "do not support channel %d,supported %d/n", channel, ioctl_val);

return (-1);

}

/*set speed */

ioctl_val = hz;

if (ioctl(fd, SNDCTL_DSP_SPEED, &ioctl_val) == -1) {

fprintf(stderr, "Set speed to %d failed:%s/n", hz, strerror(errno));

return (-1);

}

if (ioctl_val != hz) {

fprintf(stderr, "do not support speed %d,supported is %d/n", hz,ioctl_val);

return (-1);

}

return 0;

}

int main(int argc, char **argv)

{

int status =0;

int snd_f;

int fd_f;

lame_global_flags* gfp;

short *input_buff;

char *mp3_buff;

if(argc !=2){

fprintf(stderr, "useage: ./mp3_record test.mp3/n");

return -1;

}

signal(SIGINT,stop);

if((snd_f = open("/dev/dsp", O_RDONLY)) < 0){

fprintf(stderr, "open audio device error: %s", strerror(errno));

status = -1;

goto exit;

}

if((fd_f = open(argv[1], O_CREAT | O_WRONLY)) < 0){

fprintf(stderr, "open file error: %s", strerror(errno));

status = -1;

goto exit;

}

if (SetFormat(snd_f, 16, 2, 44100) < 0) {

fprintf(stderr, "cannot set /dev/dsp in bit 16, channel 2, speed 44100/n");

status = -1;

goto exit;

}

gfp = lame_init();

if (gfp == NULL) {

printf("lame_init failed/n");

status = -1;

goto exit;

}

int ret_code = lame_init_params(gfp);

if (ret_code < 0) {

printf("lame_init_params returned %d/n",ret_code);

status = -1;

goto close_lame;

}

input_buff = (short *)malloc(INBUFF_SIZE*2);

mp3_buff = (char *)malloc(MP3BUFF_SIZE);

int samples;

int mp3_bytes;

int write_bytes;

int n=100;

while(run){

//while(n>0){

//n--;

//fprintf(stderr, "n is %d./n", n);

memset(input_buff, 0 , INBUFF_SIZE*2);

memset(mp3_buff, 0 , MP3BUFF_SIZE);

samples = read(snd_f, input_buff, INBUFF_SIZE*2);

if (samples < 0) {

perror("read sound device failed");

status = -1;

goto free_buffers;

}

// fprintf(stderr, "samples is %d./n", samples);

mp3_bytes = lame_encode_buffer_interleaved(gfp, input_buff, samples/4, mp3_buff, MP3BUFF_SIZE);

//fprintf(stderr, "mp3_bytes is %d./n", mp3_bytes);

if (mp3_bytes < 0) {

printf("lame_encode_buffer_interleaved returned %d/n", mp3_bytes);

status = -1;

goto free_buffers;

}

write_bytes = write(fd_f, mp3_buff, mp3_bytes);

//fprintf(stderr, "write_bytes is %d./n", write_bytes);

if(write_bytes < 0){

perror("write sound data file failed");

status = -1;

goto free_buffers;

}

}

mp3_bytes = lame_encode_flush(gfp, mp3_buff, sizeof(mp3_buff));

if (mp3_bytes > 0) {

fprintf(stderr, "writing %d mp3 bytes/n", mp3_bytes);

if(write(fd_f, mp3_buff, mp3_bytes) <0)

fprintf(stderr, "'writing mp3 bytes error/n");

}

else

fprintf(stderr, "writing mp3 bytes 0/n");

free_buffers:

free(mp3_buff);

mp3_buff = NULL;

free(input_buff);

input_buff = NULL;

close(snd_f);

close(fd_f);

close_lame:

lame_close(gfp);

exit:

return status;

}

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