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annotate src/audio/disk/SDL_diskaudio.c @ 1555:780fd5b61df1

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Fixed bug #89 Date: Sun, 23 Oct 2005 16:39:03 +0200 From: "A. Schmid" <sahib@phreaker.net> Subject: [SDL] no software surfaces with svgalib driver? Hi, I noticed that the SDL (1.2.9) svgalib driver only makes use of linear addressable (framebuffer) video modes. On older systems (like one of mine), linear addressable modes are often not available. Especially for cards with VESA VBE < 2.0 the svgalib vesa driver is unusable, since VESA only supports framebuffering for VBE 2.0 and later. The changes necessary to add support for software surfaces seem to be relatively small. I only had to hack src/video/svga/SDL_svgavideo.c (see attached patch). The code worked fine for me, but it is no more than a proof of concept and should be reviewed (probably has a memory leak when switching modes). It also uses the vgagl library (included in the svgalib package) and needs to be linked against it. -Alex
author Sam Lantinga <slouken@libsdl.org>
date Sun, 19 Mar 2006 12:05:16 +0000
parents 84535f702874
children c439dad53df8
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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22 This file hacked^H^H^H^H^H^Hwritten by Ryan C. Gordon
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23 (icculus@linuxgames.com)
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24 */
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25 #include "SDL_config.h"
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26
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27 /* Output raw audio data to a file. */
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28
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29 #if HAVE_STDIO_H
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30 #include <stdio.h>
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31 #endif
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32
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33 #include "SDL_rwops.h"
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34 #include "SDL_timer.h"
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35 #include "SDL_audio.h"
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36 #include "../SDL_audiomem.h"
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37 #include "../SDL_audio_c.h"
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38 #include "../SDL_audiodev_c.h"
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39 #include "SDL_diskaudio.h"
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40
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41 /* The tag name used by DISK audio */
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42 #define DISKAUD_DRIVER_NAME "disk"
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43
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44 /* environment variables and defaults. */
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45 #define DISKENVR_OUTFILE "SDL_DISKAUDIOFILE"
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46 #define DISKDEFAULT_OUTFILE "sdlaudio.raw"
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47 #define DISKENVR_WRITEDELAY "SDL_DISKAUDIODELAY"
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48 #define DISKDEFAULT_WRITEDELAY 150
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49
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50 /* Audio driver functions */
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51 static int DISKAUD_OpenAudio(_THIS, SDL_AudioSpec *spec);
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52 static void DISKAUD_WaitAudio(_THIS);
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53 static void DISKAUD_PlayAudio(_THIS);
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54 static Uint8 *DISKAUD_GetAudioBuf(_THIS);
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55 static void DISKAUD_CloseAudio(_THIS);
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56
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57 static const char *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 DISKAUD_Available(void)
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65 {
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66 const char *envr = SDL_getenv("SDL_AUDIODRIVER");
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67 if (envr && (SDL_strcmp(envr, DISKAUD_DRIVER_NAME) == 0)) {
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68 return(1);
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69 }
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70 return(0);
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71 }
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72
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73 static void DISKAUD_DeleteDevice(SDL_AudioDevice *device)
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74 {
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75 SDL_free(device->hidden);
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76 SDL_free(device);
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77 }
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78
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79 static SDL_AudioDevice *DISKAUD_CreateDevice(int devindex)
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80 {
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81 SDL_AudioDevice *this;
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82 const char *envr;
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83
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84 /* Initialize all variables that we clean on shutdown */
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85 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice));
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86 if ( this ) {
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87 SDL_memset(this, 0, (sizeof *this));
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88 this->hidden = (struct SDL_PrivateAudioData *)
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89 SDL_malloc((sizeof *this->hidden));
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90 }
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91 if ( (this == NULL) || (this->hidden == NULL) ) {
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92 SDL_OutOfMemory();
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93 if ( this ) {
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94 SDL_free(this);
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95 }
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96 return(0);
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97 }
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98 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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99
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100 envr = SDL_getenv(DISKENVR_WRITEDELAY);
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101 this->hidden->write_delay = (envr) ? SDL_atoi(envr) : DISKDEFAULT_WRITEDELAY;
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102
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103 /* Set the function pointers */
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104 this->OpenAudio = DISKAUD_OpenAudio;
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105 this->WaitAudio = DISKAUD_WaitAudio;
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106 this->PlayAudio = DISKAUD_PlayAudio;
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107 this->GetAudioBuf = DISKAUD_GetAudioBuf;
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108 this->CloseAudio = DISKAUD_CloseAudio;
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109
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110 this->free = DISKAUD_DeleteDevice;
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111
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112 return this;
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113 }
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114
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115 AudioBootStrap DISKAUD_bootstrap = {
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116 DISKAUD_DRIVER_NAME, "direct-to-disk audio",
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117 DISKAUD_Available, DISKAUD_CreateDevice
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118 };
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119
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120 /* This function waits until it is possible to write a full sound buffer */
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121 static void DISKAUD_WaitAudio(_THIS)
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122 {
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123 SDL_Delay(this->hidden->write_delay);
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124 }
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125
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126 static void DISKAUD_PlayAudio(_THIS)
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127 {
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128 int written;
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129
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130 /* Write the audio data */
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131 written = SDL_RWwrite(this->hidden->output,
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132 this->hidden->mixbuf, 1,
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133 this->hidden->mixlen);
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134
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135 /* If we couldn't write, assume fatal error for now */
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136 if ( (Uint32)written != this->hidden->mixlen ) {
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137 this->enabled = 0;
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138 }
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139 #ifdef DEBUG_AUDIO
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140 fprintf(stderr, "Wrote %d bytes of audio data\n", written);
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141 #endif
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142 }
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143
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144 static Uint8 *DISKAUD_GetAudioBuf(_THIS)
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145 {
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146 return(this->hidden->mixbuf);
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147 }
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148
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149 static void DISKAUD_CloseAudio(_THIS)
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150 {
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151 if ( this->hidden->mixbuf != NULL ) {
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152 SDL_FreeAudioMem(this->hidden->mixbuf);
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153 this->hidden->mixbuf = NULL;
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154 }
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155 if ( this->hidden->output != NULL ) {
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156 SDL_RWclose(this->hidden->output);
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157 this->hidden->output = NULL;
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158 }
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159 }
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160
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161 static int DISKAUD_OpenAudio(_THIS, SDL_AudioSpec *spec)
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162 {
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163 const char *fname = DISKAUD_GetOutputFilename();
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164
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165 /* Open the audio device */
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166 this->hidden->output = SDL_RWFromFile(fname, "wb");
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167 if ( this->hidden->output == NULL ) {
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168 return(-1);
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169 }
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170
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171 #if HAVE_STDIO_H
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172 fprintf(stderr, "WARNING: You are using the SDL disk writer"
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173 " audio driver!\n Writing to file [%s].\n", fname);
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174 #endif
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175
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176 /* Allocate mixing buffer */
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177 this->hidden->mixlen = spec->size;
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178 this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen);
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179 if ( this->hidden->mixbuf == NULL ) {
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180 return(-1);
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181 }
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182 SDL_memset(this->hidden->mixbuf, spec->silence, spec->size);
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183
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184 /* We're ready to rock and roll. :-) */
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185 return(0);
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186 }
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187