求LibMPG123的使用方法。。。
最近我写的程序要灵活播放mp3，播放好多不到1秒的小mp3文件。
DirectShow定位不准，有的文件打开就从一半开始播放。。。一共就不足秒，这。。。
但是下载下来了LibMPG123，编辑了dll文件。。。但是现在只是勉强能用来播放mp3而已。。。
问下有没有办法像CDXGraph类一样的现成的类？
// mp3_to_wav.cpp : 定义控制台应用程序的入口点。//#include "stdafx.h"static int which = 0;static BYTE buffer[8192];static BYTE outbuf[2][1638400];static HWAVEOUT _ghWaveOut = NULL;static HANDLE _ghEvent = NULL;static WAVEHDR WaveHdr[2];static int playSetup(long rate, int chanel){ int err = 0; WAVEFORMATEX waveform; waveform.wFormatTag =WAVE_FORMAT_PCM; waveform.nChannels =chanel; waveform.nSamplesPerSec =rate; waveform.nAvgBytesPerSec=rate*chanel; waveform.nBlockAlign =rate*chanel/8; waveform.wBitsPerSample =16; waveform.cbSize =0; _ghEvent = CreateEvent(NULL, FALSE, FALSE, NULL); err = waveOutOpen(&_ghWaveOut, WAVE_MAPPER, &waveform, (DWORD)_ghEvent, 0, CALLBACK_EVENT); memset(WaveHdr, 0, sizeof(WaveHdr)); WaveHdr[1].dwLoops = 1; WaveHdr[0].dwLoops = 1; waveOutPrepareHeader(_ghWaveOut, &WaveHdr[1], sizeof(WAVEHDR)); waveOutPrepareHeader(_ghWaveOut, &WaveHdr[0], sizeof(WAVEHDR)); return err;}static int playAudio(const BYTE buf[], int len){ int err = 0; LPWAVEHDR pWaveHdr = &WaveHdr[which]; pWaveHdr->lpData = (LPSTR)(LPTSTR)buf ; pWaveHdr->dwBufferLength = len; err = waveOutWrite (_ghWaveOut, pWaveHdr, sizeof (WAVEHDR)); which = !which; pWaveHdr = &WaveHdr[which]; while(pWaveHdr->dwFlags == 0x12){ WaitForSingleObject(_ghEvent, -1); } return err;}static int decode_file(mpg123_handle *mh, char *path){ int n; int err; size_t done; FILE *fp = fopen(path, "rb"); if (fp == NULL){ return -1; } while(feof(fp) == 0){ n = fread(buffer, 1, sizeof(buffer), fp); err = mpg123_decode(mh, buffer, n, outbuf[which], 1638400, &done); if (err == MPG123_NEW_FORMAT){ long rate; int channels, enc; mpg123_getformat(mh, &rate, &channels, &enc); printf("new format\n"); playSetup(rate, channels); } playAudio(outbuf[which], done); while (err!=MPG123_NEED_MORE && err!=MPG123_ERR){ err = mpg123_decode(mh, NULL, 0, outbuf[which], 1638400, &done); playAudio(outbuf[which], done); } if (err == MPG123_ERR){ printf("err = %s\n", mpg123_strerror(mh)); break; } } waveOutReset(_ghWaveOut); waveOutClose(_ghWaveOut); fclose(fp); return 0;}int _tmain(int argc, _TCHAR* argv[]){ int err = 0; mpg123_init(); mpg123_handle *mh = mpg123_new(NULL, &err); assert(mh != NULL); err = mpg123_open_feed(mh); assert(err == MPG123_OK); char path[] = "300.mp3"; decode_file(mh, path); mpg123_close(mh); mpg123_delete(mh); mpg123_exit(); return 0;}