在Linux下使用Openal來播放聲音類

頭文件

1. /*
2. * SoundPlay.h
3. * 1:需要下載開發openal開發包(Software implementation of the OpenAL API(devlopment files))和alut開發包
4. * 2：添加頭文件路徑：/usr/include/AL
5. * 3:添加庫：openal和alut
6. */
7. #ifndef SOUNDPLAY_H_
8. #define SOUNDPLAY_H_
10. #include <al.h>
11. #include <alc.h>
12. #include <alut.h>
14. #include <iostream>
15. #include <stdlib.h>
16. #include <stdio.h>
18. #define numBuffer 4 //可以同時播放4個聲音
19. #define numSource 4 //可以同時播放4個聲音
21. using namespace std;
22. class SoundPlay {
23. public:
24. SoundPlay();
25. virtual ~SoundPlay();
26. void PlaySound(string fileName,int index,float volume);//當index=0：循環播放;index!=0:播放1次
27. void SetVolume(int index,float volume);
28. void ReleaseSound(int index);
29. void MusicPause(int index);
30. void MusicContinue(int index);
31. bool CheckPlayState(int i);
32. private:
33. void PlayLongSound(const char* fileName,int index);
34. void OpenDevice();
35. void CloseDevice();
36. string GetALCErrorString(ALenum err);
37. private:
38. ALuint buffers[numBuffer];
39. ALuint sources[numSource];
40. ALCcontext* cc;
41. ALCdevice* dev;
42. bool checkstate;
43. ALenum result;
44. };
45. #endif /* SOUNDPLAY_H_ */

cpp文件

1. /*
2. * SoundPlay.cpp
3. */
4. #include "SoundPlay.h"
6. SoundPlay::SoundPlay()
7. {
8. alutInit(NULL,0);
9. if ((result=alGetError()) != AL_NO_ERROR)
10. cout<<"alutInit--"<<result<<endl;
11. OpenDevice();
12. //PlaySound("Media/Music/BGSound1.wav",0,100);
13. }
14. SoundPlay::~SoundPlay()
15. {
16. CloseDevice();
17. }
18. void SoundPlay::OpenDevice()
19. {
20. ALCchar DeviceName[] = "ALSA Software";//ALSA Software,DirectSound3D
21. dev=alcOpenDevice(DeviceName);
22. cc=alcCreateContext(dev,NULL);
23. alcMakeContextCurrent(cc);
24. }
25. void SoundPlay::CloseDevice()
26. {
27. ALCcontext* context = alcGetCurrentContext();
28. ALCdevice* device = alcGetContextsDevice( context );
29. alcMakeContextCurrent( NULL );
30. alcDestroyContext( context );
31. alcCloseDevice( device );
32. }
33. void SoundPlay::ReleaseSound(int index)
34. {
35. alDeleteSources(1,&sources[index]);
36. alDeleteBuffers(1,&buffers[index]);
37. }
38. void SoundPlay::PlayLongSound(const char* fileName,int index)
39. {
40. alGenSources(1,&sources[index]);
41. alGenBuffers(1,&buffers[index]);
42. ALvoid *data;
43. ALsizei size=0,freq=0;
44. ALenum format;
45. ALboolean loop;
46. alutLoadWAVFile((ALbyte *)fileName,&format,&data,&size,&freq,&loop);
47. alBufferData(buffers[index],format,data,size,freq);
48. if ((result=alGetError()) != AL_NO_ERROR)
49. cout<<"PlayLongSound alBufferData errno"<<result<<endl;
50. alutUnloadWAV(format,data,size,freq);
51. alSourcei(sources[index],AL_BUFFER,buffers[index]);//用音源關聯緩沖器
52. if(index==0)
53. alSourcei(sources[index],AL_LOOPING,AL_TRUE);
54. alSourcePlay(sources[index]);
55. }
56. void SoundPlay::PlaySound(string fileName,int index,float volume)
57. {
58. alGenSources(1,&sources[index]);
59. alGenBuffers(1,&buffers[index]);
60. ReleaseSound(index);
61. PlayLongSound(fileName.data(),index);
62. alSourcef(sources[index],AL_GAIN,volume);
63. }
64. void SoundPlay::SetVolume(int index,float volume)//volume取值范圍(0~1)
65. {
66. alSourcef(sources[index],AL_GAIN,volume);
67. }
68. void SoundPlay::MusicPause(int index)
69. {
70. alSourcePause(sources[index]);
71. alSourceStop(sources[index]);
72. }
73. void SoundPlay::MusicContinue(int index)
74. {
75. alSourcePlay(sources[index]);
76. }
77. bool SoundPlay::CheckPlayState(int i)
78. {
79. ALint state;
80. alGetSourcei(sources[i], AL_SOURCE_STATE, &state);
81. if(state != AL_PLAYING)
82. {
83. checkstate=false;
84. return true;
85. }
86. return false;
87. }
88. int main()
89. {
90. SoundPlay sp;
91. sp.PlaySound("Media/Music/BGSound1.wav",0,100);
92. while(1){}
93. return 0;
94. }