LIBMAD解码播放器

简单的libmad封装类LibMP3:

// LibmadMP3.h: interface for the LibmadMP3 class.////////////////////////////////////////////////////////////////////////#if !defined(AFX_LIBMADMP3_H__0363C03A_CE0B_45E2_BA2D_EB73AB15B66C__INCLUDED_)#define AFX_LIBMADMP3_H__0363C03A_CE0B_45E2_BA2D_EB73AB15B66C__INCLUDED_#if _MSC_VER > 1000#pragma once#endif // _MSC_VER > 1000#include "mad.h"class LibmadMP3  {public:LibmadMP3(const char* filename);virtual ~LibmadMP3();        long  ReadFrame(unsigned char* pcm);private:int   Setup();private:    struct mad_stream    stream;    struct mad_frame     frame;    struct mad_synth     synth;    struct mad_header    header;    mad_timer_t          timer;        FILE*                file;                long                 readsize; long                 freq;long                 bitrate;int                  channel;};#endif // !defined(AFX_LIBMADMP3_H__0363C03A_CE0B_45E2_BA2D_EB73AB15B66C__INCLUDED_)

cpp文件：

// LibmadMP3.cpp: implementation of the LibmadMP3 class.////////////////////////////////////////////////////////////////////////#include "LibmadMP3.h"//////////////////////////////////////////////////////////////////////// Construction/Destruction//////////////////////////////////////////////////////////////////////static unsigned char inputBuffer[4096 + MAD_BUFFER_GUARD];signed short to_short(mad_fixed_t fixed){    if(fixed >= MAD_F_ONE)        return (SHRT_MAX);    if(fixed <= -MAD_F_ONE)        return (-SHRT_MAX);    fixed = fixed>>(MAD_F_FRACBITS-15);    return ((signed short)fixed);}LibmadMP3::LibmadMP3(const char* filename):freq(0),bitrate(0),channel(2),frameCount(0){file = fopen(filename,"rb");    mad_stream_init(&stream);    mad_frame_init(&frame);        mad_synth_init(&synth);    mad_timer_reset(&timer);}LibmadMP3::~LibmadMP3(){mad_synth_finish(&synth);    mad_frame_finish(&frame);    mad_stream_finish(&stream);     fclose(file); }int LibmadMP3::Setup(){size_t    remaining;unsigned char* read;    if(stream.next_frame != NULL)    {remaining = stream.bufend - stream.next_frame;memmove(inputBuffer, stream.next_frame, remaining);        read = inputBuffer + remaining;        readsize = 4096 - remaining;}else{readsize = 4096;read = inputBuffer;remaining=0;}readsize = fread(read,1,readsize,file);if(readsize <= 0)    {return -1;}        mad_stream_buffer(&stream, inputBuffer, readsize+remaining);    //char dest[100];    //mad_timer_string(timer, dest, "%02lu:%02u:%02u", MAD_UNITS_HOURS, MAD_UNITS_MILLISECONDS, 0);    stream.error=(mad_error)0;return 0;        }long LibmadMP3::ReadFrame(unsigned char* pcm){if(stream.buffer == NULL){if(Setup() == -1) return -1;}mad_header_decode(&frame.header,&stream);    while(mad_frame_decode(&frame,&stream) == -1)    {        if(MAD_RECOVERABLE(stream.error))        {            if(stream.error!=MAD_ERROR_LOSTSYNC)            {            }            continue;        }        else{            if(stream.error == MAD_ERROR_BUFLEN)            {                 if (Setup() == -1) return -1;                continue;            }            return -1;}    }    mad_synth_frame(&synth,&frame);if(bitrate < 128000){//获取频率freq = synth.pcm.samplerate;           ///采样频率44100bitrate = frame.header.bitrate;        ///比特率128000channel = (frame.header.mode == MAD_MODE_SINGLE_CHANNEL) ? 1 : 2;   ///声道2 立体声}        mad_timer_add(&timer,frame.header.duration);    int j = 0;    for(int i=0; i<synth.pcm.length; i++)    {        signed short sample;        sample=to_short(synth.pcm.samples[0][i]);        pcm[j++] = sample & 0xff;        pcm[j++] = sample >> 8;        if(MAD_NCHANNELS(&frame.header)==2)            sample=to_short(synth.pcm.samples[1][i]);        pcm[j++] = sample & 0xff;        pcm[j++] = sample >> 8;    }    //char dest[120];    //mad_timer_string(timer,dest, "%lu:%02lu.%03u", MAD_UNITS_MINUTES, MAD_UNITS_MILLISECONDS, 0);    return j;        }long LibmadMP3::GetPlayTime(){return mad_timer_count(timer,MAD_UNITS_MILLISECONDS);}

截图以及链接地址，百度盘：http://pan.baidu.com/s/1eQlPTmy

CSDN资源：http://download.csdn.net/detail/c_tianzi/8970807