PCM转MP3音频文件（借助lame库）

pcm2mp3.c

#include <stdio.h>#include <stdlib.h>#include <lame.h>#define INBUFSIZE 4096#define MP3BUFSIZE (int) (1.25 * INBUFSIZE) + 7200int 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);printf("input_samples is %d./n",input_samples);//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;}