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annotate src/audio/mme/SDL_mmeaudio.c @ 5267:b530ef003506

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Happy 2011! :)
author Sam Lantinga <slouken@libsdl.org>
date Fri, 11 Feb 2011 22:37:15 -0800
parents 4160ba33b597
children
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2011 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 Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 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 Lesser 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 Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 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 static void
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35 SetMMerror(char *function, MMRESULT code)
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36 {
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37 int len;
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38 char errbuf[MAXERRORLENGTH];
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39
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40 SDL_snprintf(errbuf, SDL_arraysize(errbuf), "%s: ", function);
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41 len = SDL_strlen(errbuf);
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42 waveOutGetErrorText(code, errbuf + len, MAXERRORLENGTH - len);
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43 SDL_SetError("%s", errbuf);
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44 }
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45
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46 static void CALLBACK
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47 MME_Callback(HWAVEOUT hwo,
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48 UINT uMsg, DWORD dwInstance, LPARAM dwParam1, LPARAM dwParam2)
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49 {
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50 WAVEHDR *wp = (WAVEHDR *) dwParam1;
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51
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52 if (uMsg == WOM_DONE)
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53 inUse[wp->dwUser] = FALSE;
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54 }
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55
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56 static int
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57 MME_OpenDevice(_THIS, const char *devname, int iscapture)
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58 {
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59 int valid_format = 0;
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60 MMRESULT result;
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61 Uint8 *mixbuf = NULL;
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62 int i;
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63
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64 /* Initialize all variables that we clean on shutdown */
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65 this->hidden = (struct SDL_PrivateAudioData *)
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66 SDL_malloc((sizeof *this->hidden));
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67 if (this->hidden == NULL) {
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68 SDL_OutOfMemory();
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69 return 0;
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70 }
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71 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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72
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73 /* Set basic WAVE format parameters */
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74 this->hidden->shm = mmeAllocMem(sizeof(*this->hidden->shm));
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75 if (this->hidden->shm == NULL) {
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76 MME_CloseDevice(this);
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77 SDL_OutOfMemory();
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78 return 0;
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79 }
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80
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81 SDL_memset(this->hidden->shm, '\0', sizeof(*this->hidden->shm));
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82 this->hidden->shm->sound = 0;
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83 this->hidden->shm->wFmt.wf.wFormatTag = WAVE_FORMAT_PCM;
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84
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85 /* Determine the audio parameters from the AudioSpec */
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86 /* Try for a closest match on audio format */
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87 for (test_format = SDL_FirstAudioFormat(this->spec.format);
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88 !valid_format && test_format;) {
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89 valid_format = 1;
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90 switch (test_format) {
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91 case AUDIO_U8:
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92 case AUDIO_S16:
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93 case AUDIO_S32:
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94 break;
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95 default:
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96 valid_format = 0;
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97 test_format = SDL_NextAudioFormat();
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98 }
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99 }
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100
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101 if (!valid_format) {
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102 MME_CloseDevice(this);
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103 SDL_SetError("Unsupported audio format");
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104 return 0;
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105 }
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106
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107 this->spec.format = test_format;
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108 this->hidden->shm->wFmt.wBitsPerSample = SDL_AUDIO_BITSIZE(test_format);
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109
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110 /* !!! FIXME: Can this handle more than stereo? */
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111 this->hidden->shm->wFmt.wf.nChannels = this->spec.channels;
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112 this->hidden->shm->wFmt.wf.nSamplesPerSec = this->spec.freq;
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113 this->hidden->shm->wFmt.wf.nBlockAlign =
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114 this->hidden->shm->wFmt.wf.nChannels *
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115 this->hidden->shm->wFmt.wBitsPerSample / 8;
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116 this->hidden->shm->wFmt.wf.nAvgBytesPerSec =
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117 this->hidden->shm->wFmt.wf.nSamplesPerSec *
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118 this->hidden->shm->wFmt.wf.nBlockAlign;
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119
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120 /* Check the buffer size -- minimum of 1/4 second (word aligned) */
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121 if (this->spec.samples < (this->spec.freq / 4))
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122 this->spec.samples = ((this->spec.freq / 4) + 3) & ~3;
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123
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124 /* Update the fragment size as size in bytes */
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125 SDL_CalculateAudioSpec(&this->spec);
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126
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127 /* Open the audio device */
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128 result = waveOutOpen(&(this->hidden->shm->sound),
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129 WAVE_MAPPER,
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130 &(this->hidden->shm->wFmt.wf),
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131 MME_Callback,
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132 NULL, (CALLBACK_FUNCTION | WAVE_OPEN_SHAREABLE));
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133 if (result != MMSYSERR_NOERROR) {
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134 MME_CloseDevice(this);
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135 SetMMerror("waveOutOpen()", result);
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136 return 0;
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137 }
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138
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139 /* Create the sound buffers */
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140 mixbuf = (Uint8 *) mmeAllocBuffer(NUM_BUFFERS * (this->spec.size));
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141 if (mixbuf == NULL) {
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142 MME_CloseDevice(this);
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143 SDL_OutOfMemory();
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144 return 0;
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145 }
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146 this->hidden->mixbuf = mixbuf;
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147
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148 for (i = 0; i < NUM_BUFFERS; i++) {
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149 this->hidden->shm->wHdr[i].lpData = &mixbuf[i * (this->spec.size)];
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150 this->hidden->shm->wHdr[i].dwBufferLength = this->spec.size;
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151 this->hidden->shm->wHdr[i].dwFlags = 0;
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152 this->hidden->shm->wHdr[i].dwUser = i;
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153 this->hidden->shm->wHdr[i].dwLoops = 0; /* loop control counter */
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154 this->hidden->shm->wHdr[i].lpNext = NULL; /* reserved for driver */
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155 this->hidden->shm->wHdr[i].reserved = 0;
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156 inUse[i] = FALSE;
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157 }
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158 this->hidden->next_buffer = 0;
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159
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160 return 1;
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161 }
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162
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163 static void
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164 MME_WaitDevice(_THIS)
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165 {
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166 while (inUse[this->hidden->next_buffer]) {
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167 mmeWaitForCallbacks();
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168 mmeProcessCallbacks();
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169 }
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170 }
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171
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172 static Uint8 *
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173 MME_GetDeviceBuf(_THIS)
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174 {
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175 void *retval = this->hidden->shm->wHdr[this->hidden->next_buffer].lpData;
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176 inUse[this->hidden->next_buffer] = TRUE;
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177 return (Uint8 *) retval;
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178 }
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179
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180 static void
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181 MME_PlayDevice(_THIS)
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182 {
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183 /* Queue it up */
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184 waveOutWrite(this->hidden->shm->sound,
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185 &(this->hidden->shm->wHdr[this->hidden->next_buffer]),
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186 sizeof(WAVEHDR));
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187 this->hidden->next_buffer = (this->hidden->next_buffer + 1) % NUM_BUFFERS;
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188 }
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189
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190 static void
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191 MME_WaitDone(_THIS)
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192 {
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193 MMRESULT result;
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194 int i;
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195
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196 if (this->hidden->shm->sound) {
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197 for (i = 0; i < NUM_BUFFERS; i++)
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198 while (inUse[i]) {
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199 mmeWaitForCallbacks();
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200 mmeProcessCallbacks();
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201 }
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202 result = waveOutReset(this->hidden->shm->sound);
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203 if (result != MMSYSERR_NOERROR)
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204 SetMMerror("waveOutReset()", result);
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205 mmeProcessCallbacks();
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206 }
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207 }
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208
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209 static void
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210 MME_CloseDevice(_THIS)
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211 {
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212 if (this->hidden != NULL) {
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213 MMRESULT result;
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214
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215 if (this->hidden->mixbuf) {
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216 result = mmeFreeBuffer(this->hidden->mixbuf);
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217 if (result != MMSYSERR_NOERROR)
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218 SetMMerror("mmeFreeBuffer", result);
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219 this->hidden->mixbuf = NULL;
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220 }
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221
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222 if (this->hidden->shm) {
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223 if (this->hidden->shm->sound) {
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224 result = waveOutClose(this->hidden->shm->sound);
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225 if (result != MMSYSERR_NOERROR)
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226 SetMMerror("waveOutClose()", result);
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227 mmeProcessCallbacks();
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228 }
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229 result = mmeFreeMem(this->hidden->shm);
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230 if (result != MMSYSERR_NOERROR)
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231 SetMMerror("mmeFreeMem()", result);
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232 this->hidden->shm = NULL;
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233 }
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234
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235 SDL_free(this->hidden);
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236 this->hidden = NULL;
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237 }
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238 }
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239
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240 static int
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241 MME_Init(SDL_AudioDriverImpl * impl)
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242 {
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243 /* Set the function pointers */
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Ryan C. Gordon <icculus@icculus.org>
parents: 2006
diff changeset
244 impl->OpenDevice = MME_OpenDevice;
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parents: 2006
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245 impl->WaitDevice = MME_WaitDevice;
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Ryan C. Gordon <icculus@icculus.org>
parents: 2006
diff changeset
246 impl->WaitDone = MME_WaitDone;
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Ryan C. Gordon <icculus@icculus.org>
parents: 2006
diff changeset
247 impl->PlayDevice = MME_PlayDevice;
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Ryan C. Gordon <icculus@icculus.org>
parents: 2006
diff changeset
248 impl->GetDeviceBuf = MME_GetDeviceBuf;
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Ryan C. Gordon <icculus@icculus.org>
parents: 2006
diff changeset
249 impl->CloseDevice = MME_CloseDevice;
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Ryan C. Gordon <icculus@icculus.org>
parents: 2006
diff changeset
250 impl->OnlyHasDefaultOutputDevice = 1;
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Ryan C. Gordon <icculus@icculus.org>
parents: 2006
diff changeset
251
3699
4160ba33b597 Removed test for "driver is valid, but doesn't see any audio devices."
Ryan C. Gordon <icculus@icculus.org>
parents: 3697
diff changeset
252 return 1; /* this audio target is available. */
2049
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Ryan C. Gordon <icculus@icculus.org>
parents: 2006
diff changeset
253 }
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Ryan C. Gordon <icculus@icculus.org>
parents: 2006
diff changeset
254
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Ryan C. Gordon <icculus@icculus.org>
parents: 2006
diff changeset
255 /* !!! FIXME: Windows "windib" driver is called waveout, too */
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Ryan C. Gordon <icculus@icculus.org>
parents: 2006
diff changeset
256 AudioBootStrap MMEAUDIO_bootstrap = {
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Ryan C. Gordon <icculus@icculus.org>
parents: 2006
diff changeset
257 "waveout", "Tru64 MME WaveOut", MME_Init, 0
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Ryan C. Gordon <icculus@icculus.org>
parents: 2006
diff changeset
258 };
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Ryan C. Gordon <icculus@icculus.org>
parents: 2006
diff changeset
259
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
260 /* vi: set ts=4 sw=4 expandtab: */