基於bass& glut的聲音可視化

 /* * @(#)$Id: bass_app.cpp [7/11/2010 RenYaFei] [e-mail] $ * @(#)基於OpenGL的聲音可視化 * Author: Dizuo.Hangzhou. * All Rights Reserved. * bass download URL: http://www.un4seen.com/ */ #include<windows.h> #include <GL/glut.h> #include <stdlib.h> #include <iostream> #include <vector> #include "bass.h" #pragma comment( lib, "bass.lib") using namespace std; ////////////////////////////////////////////////////////////////////////// std::vector<float> wave_ampli; int g_max_ampli(0); int g_min_ampli(1000); float g_camera_z = 0; bool g_stop(false); std::string file_name("jazz_drum.mp3"); //std::string file_name("only for you.mp3"); DWORD chan; //the file handle DWORD g_bypePerPixel; // const int MAX_PEAK = 32768; // peak max amplitude const int WIDTH = 600; // display width const int HEIGHT = 201; // height (odd number for centre line) ////////////////////////////////////////////////////////////////////////// // scan the peaks void ScanPeaks(DWORD decoder) { DWORD length = BASS_ChannelGetLength(decoder, BASS_POS_BYTE); g_bypePerPixel=BASS_ChannelGetLength(decoder,BASS_POS_BYTE)/WIDTH; // bytes per pixel if (g_bypePerPixel<BASS_ChannelSeconds2Bytes(decoder,0.02)) // minimum 20ms per pixel (BASS_ChannelGetLevel scans 20ms) g_bypePerPixel=BASS_ChannelSeconds2Bytes(decoder,0.02); DWORD cpos=0,peak[2]={0}; while (true) { DWORD level=BASS_ChannelGetLevel(decoder); // scan peaks DWORD pos; if (peak[0]<LOWORD(level)) peak[0]=LOWORD(level); // set left peak if (peak[1]<HIWORD(level)) peak[1]=HIWORD(level); // set right peak if (!BASS_ChannelIsActive(decoder)) pos=-1; // reached the end else pos=BASS_ChannelGetPosition(decoder,BASS_POS_BYTE) / g_bypePerPixel; if (pos>cpos) { DWORD a(0); int max_ampli = peak[0]*(HEIGHT/2)/MAX_PEAK; int min_ampli = peak[1]*(HEIGHT/2)/MAX_PEAK; int avg_ampli = (max_ampli + min_ampli)/2; if (avg_ampli>g_max_ampli) g_max_ampli = avg_ampli; if (avg_ampli<g_min_ampli) g_min_ampli = avg_ampli; wave_ampli.push_back( avg_ampli ); if (pos>=WIDTH) break; // gone off end of display cpos=pos; peak[0]=peak[1]=0; } } BASS_StreamFree(decoder); // free the decoder } ////////////////////////////////////////////////////////////////////////// void CALLBACK LoopSyncProc(HSYNC handle, DWORD channel, DWORD data, void *user) { BASS_ChannelSetPosition(channel,0,BASS_POS_BYTE); // failed, go to start of file instead } ////////////////////////////////////////////////////////////////////////// bool PlayFile() { const char* file=file_name.c_str(); if (!(chan=BASS_StreamCreateFile(FALSE,file,0,0,0)) && !(chan=BASS_MusicLoad(FALSE,file,0,0,BASS_MUSIC_RAMPS|BASS_MUSIC_POSRESET|BASS_MUSIC_PRESCAN,0))) { return FALSE; // Can't load the file } // repeat playing BASS_ChannelSetSync(chan,BASS_SYNC_END|BASS_SYNC_MIXTIME,0,LoopSyncProc,0); // set sync to loop at end BASS_ChannelPlay(chan,false); return true; } void init() { ////////////////////////////////////////////////////////////////////////// // Init bass if(!BASS_Init(-1,44100,0,0,NULL)) { std::cout << ("Can't initialize device"); return ; } if(!PlayFile()) { // start a file playing BASS_Free(); std::cout << "Cannot play the file" << std::endl; return; } DWORD chan2=BASS_StreamCreateFile(FALSE, file_name.c_str(),0,0,BASS_STREAM_DECODE); if (!chan2) chan2=BASS_MusicLoad(FALSE, file_name.c_str(),0,0,BASS_MUSIC_DECODE,0); ScanPeaks(chan2); for (size_t i(0); i<wave_ampli.size(); i++) std::cout << wave_ampli[i] << std::endl; cout << "max" << g_max_ampli << endl; cout << "min" << g_min_ampli << endl; ////////////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////////// GLfloat mat_diffuse[] = { 1.0, 1.0, 0.0 }; GLfloat mat_specular[] = {0.8, 0.8, 0.0, 1.0}; GLfloat mat_shininess[] = { 300. }; GLfloat light_position[] = { 100.0, 100.0, 100.0, 0.0 }; GLfloat light_diffuse[] = { 1.0, 1.0, 0.0 }; GLfloat light_ambient[] = {0.7, 0.2, 0.2, 1.0}; glClearColor (0.0, 0.0, 0.0, 0.0); glShadeModel (GL_SMOOTH); glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular); glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse); glMaterialfv(GL_FRONT, GL_SHININESS, mat_shininess); glLightfv(GL_LIGHT0, GL_POSITION, light_position); glLightfv(GL_LIGHT0, GL_AMBIENT, light_ambient); glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse); glEnable(GL_LIGHTING); glEnable(GL_LIGHT0); glEnable(GL_DEPTH_TEST); ////////////////////////////////////////////////////////////////////////// } ////////////////////////////////////////////////////////////////////////// // The sound wave will be showed in such rect: // (-w/2,h/2) (w/2,h/2) // // (-w/2, 0) (w/2, 0) ////////////////////////////////////////////////////////////////////////// void display (void) { ////////////////////////////////////////////////////////////////////////// glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glColor3f(.0, .0, .0); ////////////////////////////////////////////////////////////////////////// const float torus_offset = 50.0f; //origin, rightup, leftup, leftdown, rightdown const int offset_list[10] = {0,0, 1,1, -1,1, -1,-1, 1,-1}; const float peaks_beginPos = -WIDTH/2.0f; const float peaks_height_max = HEIGHT/2.0f; QWORD pos = BASS_ChannelGetPosition(chan,BASS_POS_BYTE); DWORD wpos = pos / g_bypePerPixel; //compute the current position DWORD peaks_level=BASS_ChannelGetLevel(chan); // get current peak's level DWORD avg_level = ( LOWORD(peaks_level) + HIWORD(peaks_level) )/2; //compute the average level:0~32768 DWORD peaks_height = avg_level*(peaks_height_max)/MAX_PEAK; //compress the level to 0~100 const float peaks_delta = WIDTH/(float)wave_ampli.size(); float scale_f = (float)avg_level/(float)MAX_PEAK; //compress the scale factor(0~1) std::cout << scale_f << std::endl; std::cout << wpos << std::endl; glPushMatrix(); glTranslatef(0, 0, g_camera_z); glPushMatrix(); { // draw peaks glBegin(GL_LINE_STRIP); //glVertex3f(beginPos, wave_ampli[0], 0); for (int i(0); i<wave_ampli.size(); i++) glVertex3f(i*peaks_delta + peaks_beginPos, wave_ampli[i], 0); glEnd(); } glPopMatrix(); ////////////////////////////////////////////////////////////////////////// // draw the current line and bounding rect edges glPushMatrix(); { // draw current position line. glBegin(GL_LINES); glVertex3f(peaks_beginPos + wpos, 0, 0); glVertex3f(peaks_beginPos + wpos, peaks_height, 0); glEnd(); glBegin(GL_LINES); glVertex3f(peaks_beginPos, 0, 0); glVertex3f(peaks_beginPos, peaks_height_max, 0); glVertex3f(-peaks_beginPos, 0, 0); glVertex3f(-peaks_beginPos, peaks_height_max, 0); glVertex3f(peaks_beginPos, 0, 0); glVertex3f(-peaks_beginPos, 0, 0); glVertex3f(peaks_beginPos, peaks_height_max, 0); glVertex3f(-peaks_beginPos, peaks_height_max, 0); glEnd(); } glPopMatrix(); ////////////////////////////////////////////////////////////////////////// // draw five torus for (int i(0); i<5; i++) { glPushMatrix(); { glTranslatef(torus_offset * offset_list[2*i], torus_offset * offset_list[2*i+1], 0.0f); if (!g_stop) glScalef(scale_f, scale_f, scale_f); glutSolidTorus(5, 30, 100, 100); } glPopMatrix(); } glPopMatrix(); glutSwapBuffers(); glutPostRedisplay(); Sleep(20); } void reshape (int w, int h) { glViewport (0, 0, w, h); glMatrixMode (GL_PROJECTION); glLoadIdentity (); gluPerspective(60.0, (float)w/h, 1.0, 500.0); glMatrixMode (GL_MODELVIEW); glLoadIdentity (); glTranslatef(0.0, 0.0, -400.0); } void keyboard(unsigned char key, int x, int y) { if (key == 's') g_stop = !g_stop; if (key == 'e') g_camera_z += 1; if (key == 'd') g_camera_z -= 1; } void mouse(int button, int state, int x, int y) { } int main(int argc, char* argv[]) { glutInit (&argc, argv); glutInitDisplayMode (GLUT_DOUBLE | GLUT_RGB); glutInitWindowSize (1027, 768); glutInitWindowPosition (100, 100); glutCreateWindow ("hello"); init(); glutDisplayFunc (display); glutReshapeFunc (reshape); glutMouseFunc(mouse); glutKeyboardFunc(keyboard); glutMainLoop (); return 0; }

 

如下圖：

矩形框中是聲音文件: jazz_drum.mp3的振幅顯示。一條運動的黃線是當然播放位置。

空間中的五個torus會根據聲音的振幅縮放，與聲音同步~

 

 

程序依賴庫：

bass.h  bass.lib  bass.dll

glut.h  glut.lib  glut.dll

 

程序簡介：

1，chan：一個DWORD類型的全局句柄保持內存中的聲音數據

2，BASS_ChannelGetLength：獲得聲音文件的字節長度

每個像素字節數 = 文件的字節長度 / 顯示區域的寬度

Bpp = file_length / area_width

將文件的字節數據分爲area_width塊。每塊有bpp個字節。

3，QWORD pos = BASS_ChannelGetPosition(chan,BASS_POS_BYTE); 獲得當前播放字節的位置。4，DWORD wpos = pos / g_bypePerPixel; 獲得當前像素位置：第pos個字節位於第幾個數據塊

5，DWORD peaks_level = BASS_ChannelGetLevel(chan);     獲得當前波峯的峯值，振幅

DWORD avg_level = ( LOWORD(peaks_level) + HIWORD(peaks_level) )/2;  需要計算出平均峯值。

6，波峯值的區間是0~32768，所以可以將平均峯值轉化到區間：[0,1]。在display函數中，每次根據當前聲音的波峯值轉化到標準0，1區間，以此作爲3d場景中的模型縮放因子。

7，scanPeaks函數是預處理聲音文件，存儲所有的峯值數據顯示。

8，可以修改width的數值。Width值越大，顯示出來的聲音波更加精確。

 

 

修改日誌：
11/7/2010 增加聲音重複播放！

效果圖：