Mercurial > sdl-ios-xcode

annotate src/audio/mme/SDL_mmeaudio.c @ 3798:c8b3d3d13ed1 SDL-ryan-multiple-audio-device

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Audio bootstraps can now specify that a driver is only to be used if explicitly requested (for things like the "disk" driver that is always available but you would never want to default to using). Trimmed out code that can be handled by stubs in the core. The "dummy" driver is pretty damned small now. :)
author Ryan C. Gordon <icculus@icculus.org>
date Wed, 04 Oct 2006 21:27:53 +0000
parents b3741f227757
children 1806fd1acba4
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 #include "SDL_config.h"
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23
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24 /* Tru64 UNIX MME support */
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25 #include <mme_api.h>
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26
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27 #include "SDL_timer.h"
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28 #include "SDL_audio.h"
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29 #include "../SDL_audio_c.h"
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30 #include "SDL_mmeaudio.h"
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31
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32 static BOOL inUse[NUM_BUFFERS];
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33
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34 /* Audio driver functions */
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35 static int MME_OpenAudio(_THIS, SDL_AudioSpec * spec);
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36 static void MME_WaitAudio(_THIS);
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37 static Uint8 *MME_GetAudioBuf(_THIS);
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38 static void MME_PlayAudio(_THIS);
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39 static void MME_WaitDone(_THIS);
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40 static void MME_CloseAudio(_THIS);
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41
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42 /* Audio driver bootstrap functions */
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43 static int
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44 Audio_Available(void)
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45 {
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46 return (1);
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47 }
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48
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49 static void
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50 Audio_DeleteDevice(SDL_AudioDevice * device)
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51 {
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52 if (device) {
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53 if (device->hidden) {
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54 SDL_free(device->hidden);
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55 device->hidden = NULL;
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56 }
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57 SDL_free(device);
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58 device = NULL;
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59 }
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60 }
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61
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62 static SDL_AudioDevice *
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63 Audio_CreateDevice(int devindex)
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64 {
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65 SDL_AudioDevice *this;
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66
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67 /* Initialize all variables that we clean on shutdown */
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68 this = SDL_malloc(sizeof(SDL_AudioDevice));
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69 if (this) {
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70 SDL_memset(this, 0, (sizeof *this));
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71 this->hidden = SDL_malloc((sizeof *this->hidden));
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72 }
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73 if ((this == NULL) || (this->hidden == NULL)) {
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74 SDL_OutOfMemory();
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75 if (this) {
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76 SDL_free(this);
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77 }
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78 return (0);
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79 }
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80 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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81 /* Set the function pointers */
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82 this->OpenAudio = MME_OpenAudio;
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83 this->WaitAudio = MME_WaitAudio;
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84 this->PlayAudio = MME_PlayAudio;
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85 this->GetAudioBuf = MME_GetAudioBuf;
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86 this->WaitDone = MME_WaitDone;
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87 this->CloseAudio = MME_CloseAudio;
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88 this->free = Audio_DeleteDevice;
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89
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90 return this;
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91 }
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92
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93 AudioBootStrap MMEAUDIO_bootstrap = {
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94 "waveout", "Tru64 MME WaveOut",
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95 Audio_Available, Audio_CreateDevice, 0
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96 };
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97
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98 static void
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99 SetMMerror(char *function, MMRESULT code)
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100 {
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101 int len;
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102 char errbuf[MAXERRORLENGTH];
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103
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104 SDL_snprintf(errbuf, SDL_arraysize(errbuf), "%s: ", function);
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105 len = SDL_strlen(errbuf);
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106 waveOutGetErrorText(code, errbuf + len, MAXERRORLENGTH - len);
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107 SDL_SetError("%s", errbuf);
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108 }
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109
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110 static void CALLBACK
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111 MME_CALLBACK(HWAVEOUT hwo,
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112 UINT uMsg, DWORD dwInstance, LPARAM dwParam1, LPARAM dwParam2)
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113 {
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114 WAVEHDR *wp = (WAVEHDR *) dwParam1;
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115
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116 if (uMsg == WOM_DONE)
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117 inUse[wp->dwUser] = FALSE;
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118 }
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119
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120 static int
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121 MME_OpenAudio(_THIS, SDL_AudioSpec * spec)
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122 {
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123 MMRESULT result;
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124 int i;
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125
e92bcf2573cb Added audio and CD-ROM support for OSF/Tru64 (thanks Hayashi!)
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126 mixbuf = NULL;
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127
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128 /* Set basic WAVE format parameters */
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129 shm = mmeAllocMem(sizeof(*shm));
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130 if (shm == NULL) {
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131 SDL_SetError("Out of memory: shm");
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132 return (-1);
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133 }
e92bcf2573cb Added audio and CD-ROM support for OSF/Tru64 (thanks Hayashi!)
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134 shm->sound = 0;
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diff changeset
135 shm->wFmt.wf.wFormatTag = WAVE_FORMAT_PCM;
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136
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diff changeset
137 /* Determine the audio parameters from the AudioSpec */
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diff changeset
138 switch (SDL_AUDIO_BITSIZE(spec->format)) {
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139 case 8:
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140 /* Unsigned 8 bit audio data */
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141 spec->format = AUDIO_U8;
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142 shm->wFmt.wBitsPerSample = 8;
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143 break;
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144 case 16:
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145 /* Signed 16 bit audio data */
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146 spec->format = AUDIO_S16;
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147 shm->wFmt.wBitsPerSample = 16;
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148 break;
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diff changeset
149 case 32:
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diff changeset
150 /* Signed 32 bit audio data */
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diff changeset
151 spec->format = AUDIO_S32;
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diff changeset
152 shm->wFmt.wBitsPerSample = 32;
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diff changeset
153 break;
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154 default:
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155 SDL_SetError("Unsupported audio format");
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156 return (-1);
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157 }
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parents:
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158
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diff changeset
159 /* !!! FIXME: Can this handle more than stereo? */
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160 shm->wFmt.wf.nChannels = spec->channels;
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161 shm->wFmt.wf.nSamplesPerSec = spec->freq;
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162 shm->wFmt.wf.nBlockAlign =
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163 shm->wFmt.wf.nChannels * shm->wFmt.wBitsPerSample / 8;
654
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164 shm->wFmt.wf.nAvgBytesPerSec =
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165 shm->wFmt.wf.nSamplesPerSec * shm->wFmt.wf.nBlockAlign;
654
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166
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parents:
diff changeset
167 /* Check the buffer size -- minimum of 1/4 second (word aligned) */
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168 if (spec->samples < (spec->freq / 4))
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169 spec->samples = ((spec->freq / 4) + 3) & ~3;
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170
e92bcf2573cb Added audio and CD-ROM support for OSF/Tru64 (thanks Hayashi!)
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diff changeset
171 /* Update the fragment size as size in bytes */
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diff changeset
172 SDL_CalculateAudioSpec(spec);
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diff changeset
173
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diff changeset
174 /* Open the audio device */
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diff changeset
175 result = waveOutOpen(&(shm->sound),
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176 WAVE_MAPPER,
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177 &(shm->wFmt.wf),
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178 MME_CALLBACK,
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179 NULL, (CALLBACK_FUNCTION | WAVE_OPEN_SHAREABLE));
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180 if (result != MMSYSERR_NOERROR) {
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181 SetMMerror("waveOutOpen()", result);
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182 return (-1);
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183 }
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184
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185 /* Create the sound buffers */
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186 mixbuf = (Uint8 *) mmeAllocBuffer(NUM_BUFFERS * (spec->size));
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187 if (mixbuf == NULL) {
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188 SDL_SetError("Out of memory: mixbuf");
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189 return (-1);
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190 }
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191
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192 for (i = 0; i < NUM_BUFFERS; i++) {
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193 shm->wHdr[i].lpData = &mixbuf[i * (spec->size)];
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194 shm->wHdr[i].dwBufferLength = spec->size;
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195 shm->wHdr[i].dwFlags = 0;
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196 shm->wHdr[i].dwUser = i;
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197 shm->wHdr[i].dwLoops = 0; /* loop control counter */
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198 shm->wHdr[i].lpNext = NULL; /* reserved for driver */
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199 shm->wHdr[i].reserved = 0;
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200 inUse[i] = FALSE;
654
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201 }
e92bcf2573cb Added audio and CD-ROM support for OSF/Tru64 (thanks Hayashi!)
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diff changeset
202 next_buffer = 0;
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diff changeset
203 return 0;
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diff changeset
204 }
e92bcf2573cb Added audio and CD-ROM support for OSF/Tru64 (thanks Hayashi!)
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parents:
diff changeset
205
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diff changeset
206 static void
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diff changeset
207 MME_WaitAudio(_THIS)
654
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diff changeset
208 {
1895
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diff changeset
209 while (inUse[next_buffer]) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
210 mmeWaitForCallbacks();
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diff changeset
211 mmeProcessCallbacks();
755
b1595db396a7 Date: Fri, 12 Dec 2003 11:51:21 +0900
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diff changeset
212 }
654
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diff changeset
213 }
e92bcf2573cb Added audio and CD-ROM support for OSF/Tru64 (thanks Hayashi!)
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parents:
diff changeset
214
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diff changeset
215 static Uint8 *
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diff changeset
216 MME_GetAudioBuf(_THIS)
654
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diff changeset
217 {
e92bcf2573cb Added audio and CD-ROM support for OSF/Tru64 (thanks Hayashi!)
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diff changeset
218 Uint8 *retval;
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diff changeset
219
e92bcf2573cb Added audio and CD-ROM support for OSF/Tru64 (thanks Hayashi!)
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parents:
diff changeset
220 inUse[next_buffer] = TRUE;
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221 retval = (Uint8 *) (shm->wHdr[next_buffer].lpData);
654
e92bcf2573cb Added audio and CD-ROM support for OSF/Tru64 (thanks Hayashi!)
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parents:
diff changeset
222 return retval;
e92bcf2573cb Added audio and CD-ROM support for OSF/Tru64 (thanks Hayashi!)
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parents:
diff changeset
223 }
e92bcf2573cb Added audio and CD-ROM support for OSF/Tru64 (thanks Hayashi!)
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parents:
diff changeset
224
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diff changeset
225 static void
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
226 MME_PlayAudio(_THIS)
654
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diff changeset
227 {
e92bcf2573cb Added audio and CD-ROM support for OSF/Tru64 (thanks Hayashi!)
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parents:
diff changeset
228 /* Queue it up */
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parents:
diff changeset
229 waveOutWrite(shm->sound, &(shm->wHdr[next_buffer]), sizeof(WAVEHDR));
1895
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230 next_buffer = (next_buffer + 1) % NUM_BUFFERS;
654
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diff changeset
231 }
e92bcf2573cb Added audio and CD-ROM support for OSF/Tru64 (thanks Hayashi!)
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parents:
diff changeset
232
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diff changeset
233 static void
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
234 MME_WaitDone(_THIS)
654
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diff changeset
235 {
e92bcf2573cb Added audio and CD-ROM support for OSF/Tru64 (thanks Hayashi!)
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parents:
diff changeset
236 MMRESULT result;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
237 int i;
e92bcf2573cb Added audio and CD-ROM support for OSF/Tru64 (thanks Hayashi!)
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diff changeset
238
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diff changeset
239 if (shm->sound) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
240 for (i = 0; i < NUM_BUFFERS; i++)
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diff changeset
241 while (inUse[i]) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
242 mmeWaitForCallbacks();
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
243 mmeProcessCallbacks();
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diff changeset
244 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
245 result = waveOutReset(shm->sound);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
246 if (result != MMSYSERR_NOERROR)
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
247 SetMMerror("waveOutReset()", result);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
248 mmeProcessCallbacks();
654
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parents:
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249 }
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250 }
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251
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252 static void
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253 MME_CloseAudio(_THIS)
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254 {
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255 MMRESULT result;
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256
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257 if (mixbuf) {
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258 result = mmeFreeBuffer(mixbuf);
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259 if (result != MMSYSERR_NOERROR)
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260 SetMMerror("mmeFreeBuffer", result);
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261 mixbuf = NULL;
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262 }
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263
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264 if (shm) {
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265 if (shm->sound) {
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266 result = waveOutClose(shm->sound);
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267 if (result != MMSYSERR_NOERROR)
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268 SetMMerror("waveOutClose()", result);
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269 mmeProcessCallbacks();
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270 }
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271 result = mmeFreeMem(shm);
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272 if (result != MMSYSERR_NOERROR)
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273 SetMMerror("mmeFreeMem()", result);
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274 shm = NULL;
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275 }
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276 }
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277
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278 /* vi: set ts=4 sw=4 expandtab: */