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annotate src/audio/mme/SDL_mmeaudio.c @ 1662:782fd950bd46 SDL-1.3

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Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API. WARNING: None of the video drivers have been updated for the new API yet! The API is still under design and very fluid. The code is now run through a consistent indent format: indent -i4 -nut -nsc -br -ce The headers are being converted to automatically generate doxygen documentation.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 28 May 2006 13:04:16 +0000
parents d910939febfa
children 4da1ee79c9af
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
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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
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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 }
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134 shm->sound = 0;
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135 shm->wFmt.wf.wFormatTag = WAVE_FORMAT_PCM;
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136
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137 /* Determine the audio parameters from the AudioSpec */
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138 switch (spec->format & 0xFF) {
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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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149 default:
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150 SDL_SetError ("Unsupported audio format");
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151 return (-1);
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152 }
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153
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154 shm->wFmt.wf.nChannels = spec->channels;
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155 shm->wFmt.wf.nSamplesPerSec = spec->freq;
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156 shm->wFmt.wf.nBlockAlign =
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157 shm->wFmt.wf.nChannels * shm->wFmt.wBitsPerSample / 8;
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158 shm->wFmt.wf.nAvgBytesPerSec =
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159 shm->wFmt.wf.nSamplesPerSec * shm->wFmt.wf.nBlockAlign;
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160
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161 /* Check the buffer size -- minimum of 1/4 second (word aligned) */
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162 if (spec->samples < (spec->freq / 4))
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163 spec->samples = ((spec->freq / 4) + 3) & ~3;
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164
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165 /* Update the fragment size as size in bytes */
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166 SDL_CalculateAudioSpec (spec);
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167
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168 /* Open the audio device */
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169 result = waveOutOpen (&(shm->sound),
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170 WAVE_MAPPER,
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171 &(shm->wFmt.wf),
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172 MME_CALLBACK,
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173 NULL, (CALLBACK_FUNCTION | WAVE_OPEN_SHAREABLE));
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174 if (result != MMSYSERR_NOERROR) {
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175 SetMMerror ("waveOutOpen()", result);
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176 return (-1);
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177 }
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178
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179 /* Create the sound buffers */
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180 mixbuf = (Uint8 *) mmeAllocBuffer (NUM_BUFFERS * (spec->size));
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181 if (mixbuf == NULL) {
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182 SDL_SetError ("Out of memory: mixbuf");
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183 return (-1);
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184 }
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185
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186 for (i = 0; i < NUM_BUFFERS; i++) {
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187 shm->wHdr[i].lpData = &mixbuf[i * (spec->size)];
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188 shm->wHdr[i].dwBufferLength = spec->size;
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189 shm->wHdr[i].dwFlags = 0;
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190 shm->wHdr[i].dwUser = i;
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191 shm->wHdr[i].dwLoops = 0; /* loop control counter */
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192 shm->wHdr[i].lpNext = NULL; /* reserved for driver */
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193 shm->wHdr[i].reserved = 0;
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194 inUse[i] = FALSE;
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195 }
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196 next_buffer = 0;
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197 return 0;
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198 }
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199
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200 static void
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201 MME_WaitAudio (_THIS)
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202 {
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203 while (inUse[next_buffer]) {
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204 mmeWaitForCallbacks ();
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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 Uint8 *
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210 MME_GetAudioBuf (_THIS)
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211 {
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212 Uint8 *retval;
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213
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214 inUse[next_buffer] = TRUE;
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215 retval = (Uint8 *) (shm->wHdr[next_buffer].lpData);
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216 return retval;
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217 }
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218
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219 static void
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220 MME_PlayAudio (_THIS)
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221 {
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222 /* Queue it up */
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223 waveOutWrite (shm->sound, &(shm->wHdr[next_buffer]), sizeof (WAVEHDR));
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224 next_buffer = (next_buffer + 1) % NUM_BUFFERS;
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225 }
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226
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227 static void
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228 MME_WaitDone (_THIS)
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229 {
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230 MMRESULT result;
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231 int i;
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232
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233 if (shm->sound) {
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234 for (i = 0; i < NUM_BUFFERS; i++)
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235 while (inUse[i]) {
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236 mmeWaitForCallbacks ();
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237 mmeProcessCallbacks ();
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238 }
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239 result = waveOutReset (shm->sound);
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240 if (result != MMSYSERR_NOERROR)
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241 SetMMerror ("waveOutReset()", result);
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242 mmeProcessCallbacks ();
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243 }
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244 }
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245
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246 static void
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247 MME_CloseAudio (_THIS)
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248 {
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249 MMRESULT result;
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250
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251 if (mixbuf) {
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252 result = mmeFreeBuffer (mixbuf);
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253 if (result != MMSYSERR_NOERROR)
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254 SetMMerror ("mmeFreeBuffer", result);
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255 mixbuf = NULL;
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256 }
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257
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258 if (shm) {
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259 if (shm->sound) {
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260 result = waveOutClose (shm->sound);
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261 if (result != MMSYSERR_NOERROR)
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262 SetMMerror ("waveOutClose()", result);
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263 mmeProcessCallbacks ();
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264 }
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265 result = mmeFreeMem (shm);
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266 if (result != MMSYSERR_NOERROR)
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267 SetMMerror ("mmeFreeMem()", result);
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268 shm = NULL;
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269 }
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270 }
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271
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272 /* vi: set ts=4 sw=4 expandtab: */