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annotate src/audio/disk/SDL_diskaudio.c @ 1898:f89e49e51e89

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Playing around, trying to find a fast path with GDI
author Sam Lantinga <slouken@libsdl.org>
date Wed, 12 Jul 2006 07:01:35 +0000
parents c121d94672cb
children 5f6550e5184f 37c9c4590689
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 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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19 Sam Lantinga
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20 slouken@libsdl.org
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21
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22 This file written by Ryan C. Gordon (icculus@icculus.org)
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23 */
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24 #include "SDL_config.h"
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25
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26 /* Output raw audio data to a file. */
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27
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28 #if HAVE_STDIO_H
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29 #include <stdio.h>
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30 #endif
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31
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32 #include "SDL_rwops.h"
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33 #include "SDL_timer.h"
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34 #include "SDL_audio.h"
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35 #include "../SDL_audiomem.h"
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36 #include "../SDL_audio_c.h"
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37 #include "../SDL_audiodev_c.h"
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38 #include "SDL_diskaudio.h"
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39
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40 /* The tag name used by DISK audio */
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41 #define DISKAUD_DRIVER_NAME "disk"
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42
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43 /* environment variables and defaults. */
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44 #define DISKENVR_OUTFILE "SDL_DISKAUDIOFILE"
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45 #define DISKDEFAULT_OUTFILE "sdlaudio.raw"
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46 #define DISKENVR_WRITEDELAY "SDL_DISKAUDIODELAY"
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47 #define DISKDEFAULT_WRITEDELAY 150
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48
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49 /* Audio driver functions */
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50 static int DISKAUD_OpenAudio(_THIS, SDL_AudioSpec * spec);
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51 static void DISKAUD_WaitAudio(_THIS);
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52 static void DISKAUD_PlayAudio(_THIS);
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53 static Uint8 *DISKAUD_GetAudioBuf(_THIS);
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54 static void DISKAUD_CloseAudio(_THIS);
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55
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56 static const char *
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57 DISKAUD_GetOutputFilename(void)
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58 {
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59 const char *envr = SDL_getenv(DISKENVR_OUTFILE);
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60 return ((envr != NULL) ? envr : DISKDEFAULT_OUTFILE);
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61 }
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62
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63 /* Audio driver bootstrap functions */
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64 static int
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65 DISKAUD_Available(void)
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66 {
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67 const char *envr = SDL_getenv("SDL_AUDIODRIVER");
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68 if (envr && (SDL_strcmp(envr, DISKAUD_DRIVER_NAME) == 0)) {
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69 return (1);
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70 }
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71 return (0);
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72 }
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73
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74 static void
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75 DISKAUD_DeleteDevice(SDL_AudioDevice * device)
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76 {
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77 SDL_free(device->hidden);
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78 SDL_free(device);
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79 }
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80
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81 static SDL_AudioDevice *
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82 DISKAUD_CreateDevice(int devindex)
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83 {
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84 SDL_AudioDevice *this;
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85 const char *envr;
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86
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87 /* Initialize all variables that we clean on shutdown */
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88 this = (SDL_AudioDevice *) SDL_malloc(sizeof(SDL_AudioDevice));
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89 if (this) {
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90 SDL_memset(this, 0, (sizeof *this));
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91 this->hidden = (struct SDL_PrivateAudioData *)
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92 SDL_malloc((sizeof *this->hidden));
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93 }
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94 if ((this == NULL) || (this->hidden == NULL)) {
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95 SDL_OutOfMemory();
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96 if (this) {
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97 SDL_free(this);
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98 }
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99 return (0);
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100 }
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101 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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102
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103 envr = SDL_getenv(DISKENVR_WRITEDELAY);
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104 this->hidden->write_delay =
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105 (envr) ? SDL_atoi(envr) : DISKDEFAULT_WRITEDELAY;
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106
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107 /* Set the function pointers */
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108 this->OpenAudio = DISKAUD_OpenAudio;
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109 this->WaitAudio = DISKAUD_WaitAudio;
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110 this->PlayAudio = DISKAUD_PlayAudio;
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111 this->GetAudioBuf = DISKAUD_GetAudioBuf;
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112 this->CloseAudio = DISKAUD_CloseAudio;
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113
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114 this->free = DISKAUD_DeleteDevice;
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115
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116 return this;
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117 }
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118
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119 AudioBootStrap DISKAUD_bootstrap = {
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120 DISKAUD_DRIVER_NAME, "direct-to-disk audio",
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121 DISKAUD_Available, DISKAUD_CreateDevice
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122 };
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123
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124 /* This function waits until it is possible to write a full sound buffer */
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125 static void
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126 DISKAUD_WaitAudio(_THIS)
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127 {
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128 SDL_Delay(this->hidden->write_delay);
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129 }
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130
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131 static void
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132 DISKAUD_PlayAudio(_THIS)
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133 {
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134 int written;
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135
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136 /* Write the audio data */
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137 written = SDL_RWwrite(this->hidden->output,
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138 this->hidden->mixbuf, 1, this->hidden->mixlen);
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139
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140 /* If we couldn't write, assume fatal error for now */
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141 if ((Uint32) written != this->hidden->mixlen) {
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142 this->enabled = 0;
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143 }
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144 #ifdef DEBUG_AUDIO
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145 fprintf(stderr, "Wrote %d bytes of audio data\n", written);
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146 #endif
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147 }
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148
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149 static Uint8 *
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150 DISKAUD_GetAudioBuf(_THIS)
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151 {
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152 return (this->hidden->mixbuf);
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153 }
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154
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155 static void
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156 DISKAUD_CloseAudio(_THIS)
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157 {
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158 if (this->hidden->mixbuf != NULL) {
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159 SDL_FreeAudioMem(this->hidden->mixbuf);
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160 this->hidden->mixbuf = NULL;
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161 }
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162 if (this->hidden->output != NULL) {
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163 SDL_RWclose(this->hidden->output);
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164 this->hidden->output = NULL;
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165 }
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166 }
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167
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168 static int
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169 DISKAUD_OpenAudio(_THIS, SDL_AudioSpec * spec)
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170 {
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171 const char *fname = DISKAUD_GetOutputFilename();
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172
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173 /* Open the audio device */
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174 this->hidden->output = SDL_RWFromFile(fname, "wb");
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175 if (this->hidden->output == NULL) {
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176 return (-1);
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177 }
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178 #if HAVE_STDIO_H
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179 fprintf(stderr, "WARNING: You are using the SDL disk writer"
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180 " audio driver!\n Writing to file [%s].\n", fname);
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181 #endif
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182
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183 /* Allocate mixing buffer */
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184 this->hidden->mixlen = spec->size;
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185 this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen);
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186 if (this->hidden->mixbuf == NULL) {
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187 return (-1);
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188 }
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189 SDL_memset(this->hidden->mixbuf, spec->silence, spec->size);
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190
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191 /* We're ready to rock and roll. :-) */
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192 return (0);
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193 }
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194
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195 /* vi: set ts=4 sw=4 expandtab: */