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annotate src/audio/mme/SDL_mmeaudio.c @ 1361:19418e4422cb

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New configure-based build system. Still work in progress, but much improved
author Sam Lantinga <slouken@libsdl.org>
date Thu, 16 Feb 2006 10:11:48 +0000
parents c71e05b4dc2e
children d910939febfa
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2004 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Library General Public License for more details.
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14
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15 You should have received a copy of the GNU Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22
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23 /* Tru64 UNIX MME support */
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24 #include <mme_api.h>
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25
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26 #include "SDL_timer.h"
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27 #include "SDL_audio.h"
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28 #include "../SDL_audio_c.h"
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29 #include "SDL_mmeaudio.h"
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30
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31 static BOOL inUse[NUM_BUFFERS];
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32
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33 /* Audio driver functions */
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34 static int MME_OpenAudio(_THIS, SDL_AudioSpec *spec);
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35 static void MME_WaitAudio(_THIS);
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36 static Uint8 *MME_GetAudioBuf(_THIS);
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37 static void MME_PlayAudio(_THIS);
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38 static void MME_WaitDone(_THIS);
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39 static void MME_CloseAudio(_THIS);
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40
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41 /* Audio driver bootstrap functions */
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42 static int Audio_Available(void)
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43 {
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44 return(1);
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45 }
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46
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47 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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48 {
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49 if ( device ) {
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50 if ( device->hidden ) {
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51 SDL_free(device->hidden);
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52 device->hidden = NULL;
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53 }
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54 SDL_free(device);
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55 device = NULL;
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56 }
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57 }
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58
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59 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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60 {
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61 SDL_AudioDevice *this;
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62
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63 /* Initialize all variables that we clean on shutdown */
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64 this = SDL_malloc(sizeof(SDL_AudioDevice));
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65 if ( this ) {
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66 SDL_memset(this, 0, (sizeof *this));
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67 this->hidden = SDL_malloc((sizeof *this->hidden));
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68 }
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69 if ( (this == NULL) || (this->hidden == NULL) ) {
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70 SDL_OutOfMemory();
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71 if ( this ) {
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72 SDL_free(this);
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73 }
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74 return(0);
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75 }
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76 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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77 /* Set the function pointers */
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78 this->OpenAudio = MME_OpenAudio;
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79 this->WaitAudio = MME_WaitAudio;
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80 this->PlayAudio = MME_PlayAudio;
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81 this->GetAudioBuf = MME_GetAudioBuf;
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82 this->WaitDone = MME_WaitDone;
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83 this->CloseAudio = MME_CloseAudio;
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84 this->free = Audio_DeleteDevice;
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85
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86 return this;
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87 }
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88
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89 AudioBootStrap MMEAUDIO_bootstrap = {
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90 "waveout", "Tru64 MME WaveOut",
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91 Audio_Available, Audio_CreateDevice
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92 };
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93
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94 static void SetMMerror(char *function, MMRESULT code)
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95 {
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96 int len;
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97 char errbuf[MAXERRORLENGTH];
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98
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99 SDL_snprintf(errbuf, SDL_arraysize(errbuf), "%s: ", function);
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100 len = SDL_strlen(errbuf);
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101 waveOutGetErrorText(code, errbuf+len, MAXERRORLENGTH-len);
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102 SDL_SetError("%s",errbuf);
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103 }
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104
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105 static void CALLBACK MME_CALLBACK(HWAVEOUT hwo,
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106 UINT uMsg,
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107 DWORD dwInstance,
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108 LPARAM dwParam1,
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109 LPARAM dwParam2)
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110 {
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111 WAVEHDR *wp = (WAVEHDR *) dwParam1;
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112
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113 if ( uMsg == WOM_DONE )
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114 inUse[wp->dwUser] = FALSE;
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115 }
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116
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117 static int MME_OpenAudio(_THIS, SDL_AudioSpec *spec)
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118 {
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119 MMRESULT result;
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120 int i;
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121
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122 mixbuf = NULL;
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123
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124 /* Set basic WAVE format parameters */
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125 shm = mmeAllocMem(sizeof(*shm));
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126 if ( shm == NULL ) {
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127 SDL_SetError("Out of memory: shm");
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128 return(-1);
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diff changeset
129 }
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diff changeset
130 shm->sound = 0;
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diff changeset
131 shm->wFmt.wf.wFormatTag = WAVE_FORMAT_PCM;
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132
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diff changeset
133 /* Determine the audio parameters from the AudioSpec */
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134 switch ( spec->format & 0xFF ) {
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135 case 8:
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diff changeset
136 /* Unsigned 8 bit audio data */
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diff changeset
137 spec->format = AUDIO_U8;
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138 shm->wFmt.wBitsPerSample = 8;
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139 break;
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diff changeset
140 case 16:
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diff changeset
141 /* Signed 16 bit audio data */
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142 spec->format = AUDIO_S16;
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143 shm->wFmt.wBitsPerSample = 16;
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diff changeset
144 break;
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diff changeset
145 default:
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146 SDL_SetError("Unsupported audio format");
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147 return(-1);
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148 }
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149
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150 shm->wFmt.wf.nChannels = spec->channels;
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151 shm->wFmt.wf.nSamplesPerSec = spec->freq;
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152 shm->wFmt.wf.nBlockAlign =
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diff changeset
153 shm->wFmt.wf.nChannels * shm->wFmt.wBitsPerSample / 8;
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154 shm->wFmt.wf.nAvgBytesPerSec =
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155 shm->wFmt.wf.nSamplesPerSec * shm->wFmt.wf.nBlockAlign;
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156
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157 /* Check the buffer size -- minimum of 1/4 second (word aligned) */
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158 if ( spec->samples < (spec->freq/4) )
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159 spec->samples = ((spec->freq/4)+3)&~3;
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160
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diff changeset
161 /* Update the fragment size as size in bytes */
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162 SDL_CalculateAudioSpec(spec);
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diff changeset
163
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
164 /* Open the audio device */
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165 result = waveOutOpen(&(shm->sound),
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166 WAVE_MAPPER,
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
167 &(shm->wFmt.wf),
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168 MME_CALLBACK,
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diff changeset
169 NULL,
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170 (CALLBACK_FUNCTION|WAVE_OPEN_SHAREABLE));
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171 if ( result != MMSYSERR_NOERROR ) {
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172 SetMMerror("waveOutOpen()", result);
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173 return(-1);
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174 }
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175
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
176 /* Create the sound buffers */
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177 mixbuf = (Uint8 *)mmeAllocBuffer(NUM_BUFFERS * (spec->size));
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178 if ( mixbuf == NULL ) {
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179 SDL_SetError("Out of memory: mixbuf");
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180 return(-1);
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181 }
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182
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183 for (i = 0; i < NUM_BUFFERS; i++) {
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diff changeset
184 shm->wHdr[i].lpData = &mixbuf[i * (spec->size)];
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185 shm->wHdr[i].dwBufferLength = spec->size;
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186 shm->wHdr[i].dwFlags = 0;
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187 shm->wHdr[i].dwUser = i;
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188 shm->wHdr[i].dwLoops = 0; /* loop control counter */
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189 shm->wHdr[i].lpNext = NULL; /* reserved for driver */
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190 shm->wHdr[i].reserved = 0;
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191 inUse[i] = FALSE;
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192 }
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193 next_buffer = 0;
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194 return 0;
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195 }
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196
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197 static void MME_WaitAudio(_THIS)
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198 {
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199 while ( inUse[next_buffer] ) {
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200 mmeWaitForCallbacks();
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201 mmeProcessCallbacks();
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202 }
654
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203 }
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204
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205 static Uint8 *MME_GetAudioBuf(_THIS)
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206 {
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diff changeset
207 Uint8 *retval;
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208
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diff changeset
209 inUse[next_buffer] = TRUE;
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210 retval = (Uint8 *)(shm->wHdr[next_buffer].lpData);
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211 return retval;
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212 }
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213
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diff changeset
214 static void MME_PlayAudio(_THIS)
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diff changeset
215 {
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diff changeset
216 /* Queue it up */
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diff changeset
217 waveOutWrite(shm->sound, &(shm->wHdr[next_buffer]), sizeof(WAVEHDR));
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218 next_buffer = (next_buffer+1)%NUM_BUFFERS;
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diff changeset
219 }
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diff changeset
220
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diff changeset
221 static void MME_WaitDone(_THIS)
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diff changeset
222 {
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diff changeset
223 MMRESULT result;
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parents:
diff changeset
224 int i;
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parents:
diff changeset
225
e92bcf2573cb Added audio and CD-ROM support for OSF/Tru64 (thanks Hayashi!)
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diff changeset
226 if ( shm->sound ) {
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227 for (i = 0; i < NUM_BUFFERS; i++)
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228 while ( inUse[i] ) {
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229 mmeWaitForCallbacks();
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230 mmeProcessCallbacks();
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diff changeset
231 }
654
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diff changeset
232 result = waveOutReset(shm->sound);
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233 if ( result != MMSYSERR_NOERROR )
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diff changeset
234 SetMMerror("waveOutReset()", result);
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235 mmeProcessCallbacks();
654
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236 }
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diff changeset
237 }
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238
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
239 static void MME_CloseAudio(_THIS)
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240 {
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diff changeset
241 MMRESULT result;
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diff changeset
242
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
243 if ( mixbuf ) {
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diff changeset
244 result = mmeFreeBuffer(mixbuf);
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diff changeset
245 if (result != MMSYSERR_NOERROR )
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diff changeset
246 SetMMerror("mmeFreeBuffer", result);
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diff changeset
247 mixbuf = NULL;
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
248 }
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249
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
250 if ( shm ) {
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
251 if ( shm->sound ) {
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
252 result = waveOutClose(shm->sound);
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diff changeset
253 if (result != MMSYSERR_NOERROR )
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diff changeset
254 SetMMerror("waveOutClose()", result);
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255 mmeProcessCallbacks();
654
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256 }
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257 result = mmeFreeMem(shm);
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258 if (result != MMSYSERR_NOERROR )
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259 SetMMerror("mmeFreeMem()", result);
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260 shm = NULL;
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261 }
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262 }
e92bcf2573cb Added audio and CD-ROM support for OSF/Tru64 (thanks Hayashi!)
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263