Mercurial > sdl-ios-xcode

annotate src/audio/disk/SDL_diskaudio.c @ 2042:3908e1f808e1

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Fixed bug #292 I might be on crack here. It looks like SDL_ConvertMono() in src/audio/SDL_audiocvt.c adds the left and right channels of a stereo stream together, and clamps the new mono channel if it would overflow. Shouldn't it be dividing by 2 to average the two sample points instead of clamping? Otherwise the mono sample point's volume doubles in the conversion. This would also make the conversion faster, as it replaces two branches per sample frame with a bitwise shift. --ryan.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 24 Sep 2006 15:56:36 +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: */