15eb0001 |
1 | \r |
2 | #include "stdafx.h"\r |
3 | \r |
4 | int WaveRate=0;\r |
5 | int WaveLen=0; // Length of each buffer in samples\r |
6 | short *WaveDest=NULL; // Destination to render sound\r |
7 | \r |
8 | static HWAVEOUT WaveOut=NULL;\r |
9 | static short *WaveBuf=NULL; // Wave double-buffer\r |
10 | static WAVEHDR WaveHeader[2]; // WAVEHDR for each buffer\r |
11 | static int WavePlay=0; // Next buffer side to play\r |
12 | \r |
13 | int WaveInit()\r |
14 | {\r |
15 | WAVEFORMATEX wfx;\r |
16 | WAVEHDR *pwh=NULL;\r |
17 | \r |
18 | if (WaveOut) return 0; // Already initted\r |
19 | \r |
20 | memset(&wfx,0,sizeof(wfx));\r |
21 | memset(&WaveHeader,0,sizeof(WaveHeader));\r |
22 | \r |
23 | wfx.wFormatTag=WAVE_FORMAT_PCM;\r |
24 | wfx.nChannels=2; // stereo\r |
25 | wfx.nSamplesPerSec=WaveRate; // sample rate\r |
26 | wfx.wBitsPerSample=16;\r |
27 | // Calculate bytes per sample and per second\r |
28 | wfx.nBlockAlign=(unsigned short)( (wfx.wBitsPerSample>>3)*wfx.nChannels );\r |
29 | wfx.nAvgBytesPerSec=wfx.nSamplesPerSec*wfx.nBlockAlign;\r |
30 | \r |
31 | waveOutOpen(&WaveOut,WAVE_MAPPER,&wfx,0,NULL,CALLBACK_NULL);\r |
32 | \r |
33 | // Allocate both buffers\r |
34 | WaveBuf=(short *)malloc(WaveLen<<3);\r |
35 | if (WaveBuf==NULL) return 1;\r |
36 | memset(WaveBuf,0,WaveLen<<3);\r |
37 | \r |
38 | // Make WAVEHDRs for both buffers\r |
39 | pwh=WaveHeader+0;\r |
40 | pwh->lpData=(char *)WaveBuf;\r |
41 | pwh->dwBufferLength=WaveLen<<2;\r |
42 | pwh->dwLoops=1;\r |
43 | \r |
44 | pwh=WaveHeader+1;\r |
45 | *pwh=WaveHeader[0]; pwh->lpData+=WaveLen<<2;\r |
46 | \r |
47 | // Prepare the buffers\r |
48 | waveOutPrepareHeader(WaveOut,WaveHeader, sizeof(WAVEHDR));\r |
49 | waveOutPrepareHeader(WaveOut,WaveHeader+1,sizeof(WAVEHDR));\r |
50 | \r |
51 | // Queue both buffers:\r |
52 | WavePlay=0;\r |
53 | WaveHeader[0].dwFlags|=WHDR_DONE;\r |
54 | WaveHeader[1].dwFlags|=WHDR_DONE;\r |
55 | WaveUpdate();\r |
56 | return 0;\r |
57 | }\r |
58 | \r |
59 | int WaveExit()\r |
60 | {\r |
61 | WAVEHDR *pwh=NULL;\r |
62 | int i=0;\r |
63 | \r |
64 | if (WaveOut) waveOutReset(WaveOut);\r |
65 | \r |
66 | for (i=0;i<2;i++)\r |
67 | {\r |
68 | pwh=WaveHeader+i;\r |
69 | if (pwh->lpData) waveOutUnprepareHeader(WaveOut,pwh,sizeof(*pwh));\r |
70 | }\r |
71 | memset(WaveHeader,0,sizeof(WaveHeader));\r |
72 | \r |
73 | free(WaveBuf); WaveBuf=NULL; WaveLen=0;\r |
74 | \r |
75 | if (WaveOut) waveOutClose(WaveOut); WaveOut=NULL;\r |
76 | return 0;\r |
77 | }\r |
78 | \r |
79 | int WaveUpdate()\r |
80 | {\r |
81 | WAVEHDR *pwh=NULL; int i=0;\r |
82 | int Last=-1;\r |
83 | \r |
84 | for (i=0;i<2;i++)\r |
85 | {\r |
86 | pwh=WaveHeader+WavePlay;\r |
87 | if (pwh->lpData==NULL) return 1; // Not initted\r |
88 | \r |
89 | if (pwh->dwFlags&WHDR_DONE)\r |
90 | {\r |
91 | // This buffer has finished - start it playing again\r |
92 | WaveDest=(short *)pwh->lpData;\r |
93 | SndRender();\r |
94 | WaveDest=NULL;\r |
95 | \r |
96 | waveOutWrite(WaveOut,pwh,sizeof(*pwh));\r |
97 | Last=WavePlay; // Remember the last buffer we played\r |
98 | }\r |
99 | \r |
100 | WavePlay++; WavePlay&=1;\r |
101 | }\r |
102 | \r |
103 | if (Last>=0) WavePlay=Last^1; // Next buffer to play is the other one\r |
104 | return 0;\r |
105 | }\r |