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annotate src/audio/mme/SDL_mmeaudio.c @ 769:b8d311d90021

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Updated copyright information for 2004 (Happy New Year!)
author Sam Lantinga <slouken@libsdl.org>
date Sun, 04 Jan 2004 16:49:27 +0000
parents b1595db396a7
children 3692456e7b0f
rev   line source
654
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1 /*
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2 SDL - Simple DirectMedia Layer
769
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parents: 755
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3 Copyright (C) 1997-2004 Sam Lantinga
654
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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 "SDL_mmeaudio.h"
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25
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26 static BOOL inUse[NUM_BUFFERS];
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27
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28 /* Audio driver functions */
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29 static int MME_OpenAudio(_THIS, SDL_AudioSpec *spec);
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30 static void MME_WaitAudio(_THIS);
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31 static Uint8 *MME_GetAudioBuf(_THIS);
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32 static void MME_PlayAudio(_THIS);
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33 static void MME_WaitDone(_THIS);
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34 static void MME_CloseAudio(_THIS);
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35
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36 /* Audio driver bootstrap functions */
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37 static int Audio_Available(void)
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38 {
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39 return(1);
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40 }
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41
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42 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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43 {
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44 if ( device ) {
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45 if ( device->hidden ) {
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46 free(device->hidden);
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47 device->hidden = NULL;
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48 }
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49 free(device);
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50 device = NULL;
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51 }
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52 }
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53
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54 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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55 {
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56 SDL_AudioDevice *this;
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57
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58 /* Initialize all variables that we clean on shutdown */
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59 this = malloc(sizeof(SDL_AudioDevice));
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60 if ( this ) {
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61 memset(this, 0, (sizeof *this));
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62 this->hidden = malloc((sizeof *this->hidden));
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63 }
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64 if ( (this == NULL) || (this->hidden == NULL) ) {
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65 SDL_OutOfMemory();
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66 if ( this ) {
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67 free(this);
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68 }
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69 return(0);
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70 }
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71 memset(this->hidden, 0, (sizeof *this->hidden));
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72 /* Set the function pointers */
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73 this->OpenAudio = MME_OpenAudio;
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74 this->WaitAudio = MME_WaitAudio;
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75 this->PlayAudio = MME_PlayAudio;
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76 this->GetAudioBuf = MME_GetAudioBuf;
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77 this->WaitDone = MME_WaitDone;
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78 this->CloseAudio = MME_CloseAudio;
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79 this->free = Audio_DeleteDevice;
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80
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81 return this;
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82 }
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83
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84 AudioBootStrap MMEAUDIO_bootstrap = {
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85 "waveout", "Tru64 MME WaveOut",
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86 Audio_Available, Audio_CreateDevice
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87 };
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88
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89 static void SetMMerror(char *function, MMRESULT code)
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90 {
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91 int len;
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92 char errbuf[MAXERRORLENGTH];
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93
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94 sprintf(errbuf, "%s: ", function);
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95 len = strlen(errbuf);
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96 waveOutGetErrorText(code, errbuf+len, MAXERRORLENGTH-len);
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97 SDL_SetError("%s",errbuf);
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98 }
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99
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100 static void CALLBACK MME_CALLBACK(HWAVEOUT hwo,
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101 UINT uMsg,
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102 DWORD dwInstance,
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103 LPARAM dwParam1,
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104 LPARAM dwParam2)
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105 {
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106 WAVEHDR *wp = (WAVEHDR *) dwParam1;
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107
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108 if ( uMsg == WOM_DONE )
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109 inUse[wp->dwUser] = FALSE;
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110 }
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111
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112 static int MME_OpenAudio(_THIS, SDL_AudioSpec *spec)
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113 {
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114 MMRESULT result;
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115 int i;
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116
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117 mixbuf = NULL;
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118
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119 /* Set basic WAVE format parameters */
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120 shm = mmeAllocMem(sizeof(*shm));
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121 if ( shm == NULL ) {
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122 SDL_SetError("Out of memory: shm");
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123 return(-1);
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124 }
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125 shm->sound = 0;
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126 shm->wFmt.wf.wFormatTag = WAVE_FORMAT_PCM;
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127
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128 /* Determine the audio parameters from the AudioSpec */
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diff changeset
129 switch ( spec->format & 0xFF ) {
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diff changeset
130 case 8:
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parents:
diff changeset
131 /* Unsigned 8 bit audio data */
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diff changeset
132 spec->format = AUDIO_U8;
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diff changeset
133 shm->wFmt.wBitsPerSample = 8;
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parents:
diff changeset
134 break;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
135 case 16:
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parents:
diff changeset
136 /* Signed 16 bit audio data */
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
137 spec->format = AUDIO_S16;
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diff changeset
138 shm->wFmt.wBitsPerSample = 16;
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diff changeset
139 break;
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
140 default:
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diff changeset
141 SDL_SetError("Unsupported audio format");
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diff changeset
142 return(-1);
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
143 }
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
144
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
145 shm->wFmt.wf.nChannels = spec->channels;
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
146 shm->wFmt.wf.nSamplesPerSec = spec->freq;
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diff changeset
147 shm->wFmt.wf.nBlockAlign =
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
148 shm->wFmt.wf.nChannels * shm->wFmt.wBitsPerSample / 8;
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diff changeset
149 shm->wFmt.wf.nAvgBytesPerSec =
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diff changeset
150 shm->wFmt.wf.nSamplesPerSec * shm->wFmt.wf.nBlockAlign;
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diff changeset
151
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
152 /* Check the buffer size -- minimum of 1/4 second (word aligned) */
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diff changeset
153 if ( spec->samples < (spec->freq/4) )
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diff changeset
154 spec->samples = ((spec->freq/4)+3)&~3;
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diff changeset
155
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
156 /* Update the fragment size as size in bytes */
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
157 SDL_CalculateAudioSpec(spec);
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diff changeset
158
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
159 /* Open the audio device */
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
160 result = waveOutOpen(&(shm->sound),
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diff changeset
161 WAVE_MAPPER,
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
162 &(shm->wFmt.wf),
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diff changeset
163 MME_CALLBACK,
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
164 NULL,
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diff changeset
165 (CALLBACK_FUNCTION|WAVE_OPEN_SHAREABLE));
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diff changeset
166 if ( result != MMSYSERR_NOERROR ) {
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diff changeset
167 SetMMerror("waveOutOpen()", result);
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diff changeset
168 return(-1);
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
169 }
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
170
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
171 /* Create the sound buffers */
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
172 mixbuf = (Uint8 *)mmeAllocBuffer(NUM_BUFFERS * (spec->size));
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
173 if ( mixbuf == NULL ) {
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
174 SDL_SetError("Out of memory: mixbuf");
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diff changeset
175 return(-1);
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
176 }
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diff changeset
177
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
178 for (i = 0; i < NUM_BUFFERS; i++) {
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
179 shm->wHdr[i].lpData = &mixbuf[i * (spec->size)];
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diff changeset
180 shm->wHdr[i].dwBufferLength = spec->size;
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
181 shm->wHdr[i].dwFlags = 0;
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
182 shm->wHdr[i].dwUser = i;
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diff changeset
183 shm->wHdr[i].dwLoops = 0; /* loop control counter */
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
184 shm->wHdr[i].lpNext = NULL; /* reserved for driver */
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diff changeset
185 shm->wHdr[i].reserved = 0;
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diff changeset
186 inUse[i] = FALSE;
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diff changeset
187 }
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diff changeset
188 next_buffer = 0;
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diff changeset
189 return 0;
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diff changeset
190 }
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diff changeset
191
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diff changeset
192 static void MME_WaitAudio(_THIS)
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193 {
755
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194 while ( inUse[next_buffer] ) {
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195 mmeWaitForCallbacks();
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196 mmeProcessCallbacks();
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diff changeset
197 }
654
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198 }
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199
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diff changeset
200 static Uint8 *MME_GetAudioBuf(_THIS)
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diff changeset
201 {
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diff changeset
202 Uint8 *retval;
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diff changeset
203
e92bcf2573cb Added audio and CD-ROM support for OSF/Tru64 (thanks Hayashi!)
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diff changeset
204 inUse[next_buffer] = TRUE;
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diff changeset
205 retval = (Uint8 *)(shm->wHdr[next_buffer].lpData);
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diff changeset
206 return retval;
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
207 }
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
208
e92bcf2573cb Added audio and CD-ROM support for OSF/Tru64 (thanks Hayashi!)
Sam Lantinga <slouken@libsdl.org>
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diff changeset
209 static void MME_PlayAudio(_THIS)
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diff changeset
210 {
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
211 /* Queue it up */
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
212 waveOutWrite(shm->sound, &(shm->wHdr[next_buffer]), sizeof(WAVEHDR));
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parents:
diff changeset
213 next_buffer = (next_buffer+1)%NUM_BUFFERS;
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parents:
diff changeset
214 }
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parents:
diff changeset
215
e92bcf2573cb Added audio and CD-ROM support for OSF/Tru64 (thanks Hayashi!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
216 static void MME_WaitDone(_THIS)
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parents:
diff changeset
217 {
e92bcf2573cb Added audio and CD-ROM support for OSF/Tru64 (thanks Hayashi!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
218 MMRESULT result;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
219 int i;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
220
e92bcf2573cb Added audio and CD-ROM support for OSF/Tru64 (thanks Hayashi!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
221 if ( shm->sound ) {
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diff changeset
222 for (i = 0; i < NUM_BUFFERS; i++)
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diff changeset
223 while ( inUse[i] ) {
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diff changeset
224 mmeWaitForCallbacks();
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diff changeset
225 mmeProcessCallbacks();
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diff changeset
226 }
654
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diff changeset
227 result = waveOutReset(shm->sound);
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diff changeset
228 if ( result != MMSYSERR_NOERROR )
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diff changeset
229 SetMMerror("waveOutReset()", result);
755
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230 mmeProcessCallbacks();
654
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diff changeset
231 }
e92bcf2573cb Added audio and CD-ROM support for OSF/Tru64 (thanks Hayashi!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
232 }
e92bcf2573cb Added audio and CD-ROM support for OSF/Tru64 (thanks Hayashi!)
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diff changeset
233
e92bcf2573cb Added audio and CD-ROM support for OSF/Tru64 (thanks Hayashi!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
234 static void MME_CloseAudio(_THIS)
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parents:
diff changeset
235 {
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
236 MMRESULT result;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
237
e92bcf2573cb Added audio and CD-ROM support for OSF/Tru64 (thanks Hayashi!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
238 if ( mixbuf ) {
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
239 result = mmeFreeBuffer(mixbuf);
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diff changeset
240 if (result != MMSYSERR_NOERROR )
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parents:
diff changeset
241 SetMMerror("mmeFreeBuffer", result);
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
242 mixbuf = NULL;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
243 }
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
244
e92bcf2573cb Added audio and CD-ROM support for OSF/Tru64 (thanks Hayashi!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
245 if ( shm ) {
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
246 if ( shm->sound ) {
e92bcf2573cb Added audio and CD-ROM support for OSF/Tru64 (thanks Hayashi!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
247 result = waveOutClose(shm->sound);
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diff changeset
248 if (result != MMSYSERR_NOERROR )
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diff changeset
249 SetMMerror("waveOutClose()", result);
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250 mmeProcessCallbacks();
654
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diff changeset
251 }
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
252 result = mmeFreeMem(shm);
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diff changeset
253 if (result != MMSYSERR_NOERROR )
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diff changeset
254 SetMMerror("mmeFreeMem()", result);
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parents:
diff changeset
255 shm = NULL;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
256 }
e92bcf2573cb Added audio and CD-ROM support for OSF/Tru64 (thanks Hayashi!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
257 }
e92bcf2573cb Added audio and CD-ROM support for OSF/Tru64 (thanks Hayashi!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
258