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1 | \r |
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2 | // This file is part of the PicoDrive Megadrive Emulator\r |
3 | \r |
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4 | // Copyright (c) 2011 FinalDave (emudave (at) gmail.com)\r |
5 | \r |
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6 | // This code is licensed under the GNU General Public License version 2.0 and the MAME License.\r |
7 | // You can choose the license that has the most advantages for you.\r |
8 | \r |
9 | // SVN repository can be found at http://code.google.com/p/cyclone68000/\r |
10 | \r |
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11 | #include "stdafx.h"\r |
12 | \r |
13 | int WaveRate=0;\r |
14 | int WaveLen=0; // Length of each buffer in samples\r |
15 | short *WaveDest=NULL; // Destination to render sound\r |
16 | \r |
17 | static HWAVEOUT WaveOut=NULL;\r |
18 | static short *WaveBuf=NULL; // Wave double-buffer\r |
19 | static WAVEHDR WaveHeader[2]; // WAVEHDR for each buffer\r |
20 | static int WavePlay=0; // Next buffer side to play\r |
21 | \r |
22 | int WaveInit()\r |
23 | {\r |
24 | WAVEFORMATEX wfx;\r |
25 | WAVEHDR *pwh=NULL;\r |
26 | \r |
27 | if (WaveOut) return 0; // Already initted\r |
28 | \r |
29 | memset(&wfx,0,sizeof(wfx));\r |
30 | memset(&WaveHeader,0,sizeof(WaveHeader));\r |
31 | \r |
32 | wfx.wFormatTag=WAVE_FORMAT_PCM;\r |
33 | wfx.nChannels=2; // stereo\r |
34 | wfx.nSamplesPerSec=WaveRate; // sample rate\r |
35 | wfx.wBitsPerSample=16;\r |
36 | // Calculate bytes per sample and per second\r |
37 | wfx.nBlockAlign=(unsigned short)( (wfx.wBitsPerSample>>3)*wfx.nChannels );\r |
38 | wfx.nAvgBytesPerSec=wfx.nSamplesPerSec*wfx.nBlockAlign;\r |
39 | \r |
40 | waveOutOpen(&WaveOut,WAVE_MAPPER,&wfx,0,NULL,CALLBACK_NULL);\r |
41 | \r |
42 | // Allocate both buffers\r |
43 | WaveBuf=(short *)malloc(WaveLen<<3);\r |
44 | if (WaveBuf==NULL) return 1;\r |
45 | memset(WaveBuf,0,WaveLen<<3);\r |
46 | \r |
47 | // Make WAVEHDRs for both buffers\r |
48 | pwh=WaveHeader+0;\r |
49 | pwh->lpData=(char *)WaveBuf;\r |
50 | pwh->dwBufferLength=WaveLen<<2;\r |
51 | pwh->dwLoops=1;\r |
52 | \r |
53 | pwh=WaveHeader+1;\r |
54 | *pwh=WaveHeader[0]; pwh->lpData+=WaveLen<<2;\r |
55 | \r |
56 | // Prepare the buffers\r |
57 | waveOutPrepareHeader(WaveOut,WaveHeader, sizeof(WAVEHDR));\r |
58 | waveOutPrepareHeader(WaveOut,WaveHeader+1,sizeof(WAVEHDR));\r |
59 | \r |
60 | // Queue both buffers:\r |
61 | WavePlay=0;\r |
62 | WaveHeader[0].dwFlags|=WHDR_DONE;\r |
63 | WaveHeader[1].dwFlags|=WHDR_DONE;\r |
64 | WaveUpdate();\r |
65 | return 0;\r |
66 | }\r |
67 | \r |
68 | int WaveExit()\r |
69 | {\r |
70 | WAVEHDR *pwh=NULL;\r |
71 | int i=0;\r |
72 | \r |
73 | if (WaveOut) waveOutReset(WaveOut);\r |
74 | \r |
75 | for (i=0;i<2;i++)\r |
76 | {\r |
77 | pwh=WaveHeader+i;\r |
78 | if (pwh->lpData) waveOutUnprepareHeader(WaveOut,pwh,sizeof(*pwh));\r |
79 | }\r |
80 | memset(WaveHeader,0,sizeof(WaveHeader));\r |
81 | \r |
82 | free(WaveBuf); WaveBuf=NULL; WaveLen=0;\r |
83 | \r |
84 | if (WaveOut) waveOutClose(WaveOut); WaveOut=NULL;\r |
85 | return 0;\r |
86 | }\r |
87 | \r |
88 | int WaveUpdate()\r |
89 | {\r |
90 | WAVEHDR *pwh=NULL; int i=0;\r |
91 | int Last=-1;\r |
92 | \r |
93 | for (i=0;i<2;i++)\r |
94 | {\r |
95 | pwh=WaveHeader+WavePlay;\r |
96 | if (pwh->lpData==NULL) return 1; // Not initted\r |
97 | \r |
98 | if (pwh->dwFlags&WHDR_DONE)\r |
99 | {\r |
100 | // This buffer has finished - start it playing again\r |
101 | WaveDest=(short *)pwh->lpData;\r |
102 | SndRender();\r |
103 | WaveDest=NULL;\r |
104 | \r |
105 | waveOutWrite(WaveOut,pwh,sizeof(*pwh));\r |
106 | Last=WavePlay; // Remember the last buffer we played\r |
107 | }\r |
108 | \r |
109 | WavePlay++; WavePlay&=1;\r |
110 | }\r |
111 | \r |
112 | if (Last>=0) WavePlay=Last^1; // Next buffer to play is the other one\r |
113 | return 0;\r |
114 | }\r |