| 1 | \r |
| 2 | // This file is part of the PicoDrive Megadrive Emulator\r |
| 3 | \r |
| 4 | // Copyright (c) 2011 FinalDave (emudave (at) gmail.com)\r |
| 5 | \r |
| 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 |
| 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 |