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annotate src/audio/riscos/SDL_drenderer.c @ 955:d74fbf56f2f6

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Date: Fri, 25 Jun 2004 13:29:15 +0100 From: "alan buckley" Subject: Modification for RISC OS version of SDL Ive attached a zip file with the changes to this email, it contains the following: The file sdldiff.txt is the output from cvs diff u. . The directory thread/riscos contains all the new files to support threading. Readme.riscos is a new readme file to add.
author Sam Lantinga <slouken@libsdl.org>
date Fri, 17 Sep 2004 13:20:10 +0000
parents b8d311d90021
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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@devolution.com
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21 */
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22
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23
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24 #include <stdlib.h>
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25 #include <stdio.h>
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26 #include <memory.h>
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27
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28 #include <kernel.h>
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29 #include "swis.h"
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30
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31 #include "SDL_endian.h"
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32 #include "SDL_audio.h"
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33 #include "SDL_audio_c.h"
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34 #include "SDL_audiomem.h"
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35 #include "SDL_sysaudio.h"
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36 #include "SDL_drenderer.h"
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37
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38 #ifndef DISABLE_THREADS
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39 #include <pthread.h>
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40 #endif
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41
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42 #define DigitalRenderer_Activate 0x4F700
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43 #define DigitalRenderer_Deactivate 0x4F701
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44 #define DigitalRenderer_ReadState 0x4F705
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45 #define DigitalRenderer_NewSample 0x4F706
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46 #define DigitalRenderer_NumBuffers 0x4F709
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47 #define DigitalRenderer_StreamSamples 0x4F70A
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48 #define DigitalRenderer_Stream16BitSamples 0x4F70B
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49 #define DigitalRenderer_StreamStatistics 0x4F70C
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50 #define DigitalRenderer_StreamFlags 0x4F70D
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51 #define DigitalRenderer_Activate16 0x4F70F
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52 #define DigitalRenderer_GetFrequency 0x4F710
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53
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54 static int FillBuffer;
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55 extern SDL_AudioDevice *current_audio;
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56
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57 extern int riscos_audiobuffer; /* Override for audio buffer size */
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58
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59 /* Audio driver functions */
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60
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61 static void DRenderer_CloseAudio(_THIS);
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62 static int DRenderer_OpenAudio(_THIS, SDL_AudioSpec *spec);
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63
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64 #ifndef DISABLE_THREADS
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65 static void DRenderer_WaitAudio(_THIS);
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66 static Uint8 *DRenderer_GetAudioBuf(_THIS);
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67 static void DRenderer_PlayAudio(_THIS);
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68 #endif
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69
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70 /* Audio driver bootstrap functions */
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71
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72 /* Define following to dump stats to stdout */
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73 /* #define DUMP_AUDIO */
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74
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75
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76 static int Audio_Available(void)
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77 {
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78 _kernel_swi_regs regs;
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79 int available = 0;
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80
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81 /* Use call to set buffers to also check if Module is loaded */
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82 regs.r[0] = 0;
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83 if (_kernel_swi(DigitalRenderer_NumBuffers, &regs, &regs) == 0) available = 1;
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84
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85 return(available);
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86 }
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87
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88 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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89 {
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90 free(device->hidden);
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91 free(device);
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92 }
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93
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94 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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95 {
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96 SDL_AudioDevice *this;
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97
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98 /* Initialize all variables that we clean on shutdown */
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99 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice));
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100 if ( this ) {
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101 memset(this, 0, (sizeof *this));
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102 this->hidden = (struct SDL_PrivateAudioData *)
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103 malloc((sizeof *this->hidden));
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104 }
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105 if ( (this == NULL) || (this->hidden == NULL) ) {
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106 SDL_OutOfMemory();
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107 if ( this ) {
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108 free(this);
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109 }
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110 return(0);
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111 }
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112 memset(this->hidden, 0, (sizeof *this->hidden));
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113
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114 /* Set the function pointers */
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115 this->OpenAudio = DRenderer_OpenAudio;
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116 this->CloseAudio = DRenderer_CloseAudio;
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117 #ifndef DISABLE_THREADS
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118 this->GetAudioBuf = DRenderer_GetAudioBuf;
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119 this->PlayAudio = DRenderer_PlayAudio;
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120 this->WaitAudio = DRenderer_WaitAudio;
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121 #endif
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122 this->free = Audio_DeleteDevice;
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123
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124 return this;
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125 }
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126
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127 AudioBootStrap DRENDERER_bootstrap = {
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128 "drenderer", "RiscOS Digital Renderer Module",
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129 Audio_Available, Audio_CreateDevice
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130 };
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131
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132 /* Routine called to check and fill audio buffers if necessary */
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133 static Uint8 *buffer = NULL;
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134
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135 #ifdef DISABLE_THREADS
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136
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137 /* Buffer fill routine called during polling */
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138 void DRenderer_FillBuffers()
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139 {
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140 SDL_AudioDevice *audio = current_audio;
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141
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142 if ( !audio || ! audio->enabled )
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143 {
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144 return;
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145 }
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146
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147 if ( ! audio->paused )
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148 {
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149 _kernel_swi_regs regs;
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150 /* Check filled buffers count */
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151 _kernel_swi(DigitalRenderer_StreamStatistics, &regs, &regs);
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152
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153 #ifdef DUMP_AUDIO
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154 if (regs.r[0] <= FillBuffer)
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155 {
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156 printf("Buffers in use %d\n", regs.r[0]);
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157 }
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158 #endif
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159
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160 while (regs.r[0] <= FillBuffer && !audio->paused)
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161 {
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162 if ( audio->convert.needed )
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163 {
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164 int silence;
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165 if ( audio->convert.src_format == AUDIO_U8 )
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166 {
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167 silence = 0x80;
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168 } else {
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169 silence = 0;
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170 }
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171 memset(audio->convert.buf, silence, audio->convert.len);
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172 audio->spec.callback(audio->spec.userdata,
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173 (Uint8 *)audio->convert.buf,audio->convert.len);
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174 SDL_ConvertAudio(&audio->convert);
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175 #if 0
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176 if ( audio->convert.len_cvt != audio->spec.size ) {
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177 /* Uh oh... probably crashes here; */
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178 }
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179 #endif
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180 regs.r[0] = (int)audio->convert.buf;
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181 regs.r[1] = audio->spec.samples * audio->spec.channels;
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182 _kernel_swi(DigitalRenderer_Stream16BitSamples, &regs, &regs);
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183
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184 } else
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185 {
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186 /* Fill buffer with silence */
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187 memset (buffer, 0, audio->spec.size);
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188
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189 audio->spec.callback(audio->spec.userdata,
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190 (Uint8 *)buffer, audio->spec.size);
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191
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192 regs.r[0] = (int)buffer;
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193 regs.r[1] = audio->spec.samples * audio->spec.channels;
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194 _kernel_swi(DigitalRenderer_Stream16BitSamples, &regs, &regs);
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195 }
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196 /* Check if we have enough buffers yet */
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197 _kernel_swi(DigitalRenderer_StreamStatistics, &regs, &regs);
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198 }
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199
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200 }
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201 }
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202
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203 #endif
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204
630
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205 /* Size of DMA buffer to use */
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206 #define DRENDERER_BUFFER_SIZE 512
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207
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208 /* Number of centiseconds of sound to buffer.
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209 Hopefully more than the maximum time between calls to the
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210 FillBuffers routine above (non-threaded) or the PlayAudio
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211 routine below (threaded).
630
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212 */
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213
630
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214 #define DRENDERER_CSEC_TO_BUFFER 10
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215
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216 static void DeactivateAudio()
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217 {
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218 _kernel_swi_regs regs;
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219
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220 /* Close down the digital renderer */
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221 _kernel_swi(DigitalRenderer_Deactivate, &regs, &regs);
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222
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223 if (buffer != NULL)
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224 {
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225 free(buffer);
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226 buffer = NULL;
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227 }
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228 }
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229
630
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230 static int DRenderer_OpenAudio(_THIS, SDL_AudioSpec *spec)
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231 {
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232 _kernel_swi_regs regs;
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233 int buffers_per_sample;
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234
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235 #ifdef DUMP_AUDIO
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236 printf("Request format %d\n", spec->format);
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237 printf("Request freq %d\n", spec->freq);
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238 printf("Samples %d\n", spec->samples);
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239 printf("Channels %d\n", spec->channels);
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240 #endif
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241
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242 /* Only support signed 16bit format */
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243 spec->format = AUDIO_S16LSB;
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244
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245 if (spec->samples < DRENDERER_BUFFER_SIZE) spec->samples = DRENDERER_BUFFER_SIZE;
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246
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247 buffers_per_sample = spec->samples / DRENDERER_BUFFER_SIZE;
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248
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249 if ((spec->samples % DRENDERER_BUFFER_SIZE) != 0)
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250 {
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251 buffers_per_sample++;
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252 spec->samples = buffers_per_sample * DRENDERER_BUFFER_SIZE;
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253 }
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254
630
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255
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256 /* Set number of buffers to use - the following should give enough
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257 data between calls to the sound polling.
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258 */
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259
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260 if (riscos_audiobuffer == 0)
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261 {
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262 FillBuffer = (int)((double)DRENDERER_CSEC_TO_BUFFER / ((double)DRENDERER_BUFFER_SIZE * 100.0 / (double)spec->freq)) + 1;
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263 } else FillBuffer = riscos_audiobuffer/DRENDERER_BUFFER_SIZE - buffers_per_sample;
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264
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265 if (FillBuffer < buffers_per_sample) FillBuffer = buffers_per_sample;
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266 #ifndef DISABLE_THREADS
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267 if (buffers_per_sample < FillBuffer)
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268 {
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269 /* For the threaded version we are only called once per cycle
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270 so the callback needs to give us the full data we need in
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271 one go, rather than multiple calls as it the case for the
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272 non threaded version */
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273 buffers_per_sample = FillBuffer;
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274 spec->samples = buffers_per_sample * DRENDERER_BUFFER_SIZE;
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275 }
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276 #endif
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277 SDL_CalculateAudioSpec(spec);
630
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278 regs.r[0] = FillBuffer + buffers_per_sample;
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279
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280 #ifdef DUMP_AUDIO
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281 printf("Buffers per sample %d\n", buffers_per_sample);
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282 printf("Fill buffer %d\n", FillBuffer);
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283 printf("Time buffered (ms) %d\n",(int)((1000.0 * regs.r[0] * DRENDERER_BUFFER_SIZE)/(double)spec->freq));
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284 #endif
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285
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286 if (_kernel_swi(DigitalRenderer_NumBuffers, &regs, &regs) != 0)
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287 {
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288 SDL_SetError("Can't set number of streaming sound buffers\n");
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289 return -1;
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290 }
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291
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292 /* Now initialise sound system */
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293 regs.r[0] = spec->channels; /* Number of channels */
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294 regs.r[1] = DRENDERER_BUFFER_SIZE; /* Samples length */
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295 regs.r[2] = spec->freq; /* frequency */
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296 regs.r[3] = 1; /* Restore previous handler on exit */
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297
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298 if (_kernel_swi(DigitalRenderer_Activate16, &regs, &regs) != 0)
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299 {
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300 SDL_SetError("Unable to activate digital renderer in 16 bit mode\n");
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301 return -1;
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302 }
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303
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304 if (_kernel_swi(DigitalRenderer_GetFrequency, &regs, &regs) == 0)
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305 {
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306 spec->freq = regs.r[0];
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307 }
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308
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309 /* Ensure sound is deactivated if we exit without calling SDL_Quit */
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310 atexit(DeactivateAudio);
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311
630
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312 #ifdef DUMP_AUDIO
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313 printf("Got format %d\n", spec->format);
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314 printf("Frequency %d\n", spec->freq);
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315 printf("Samples %d\n", spec->samples);
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316 #endif
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317
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318 /* Set to fill buffer with zero if we don't get data to it fast enough */
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319 regs.r[0] = 1;
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320 regs.r[1] = ~1;
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321 _kernel_swi(DigitalRenderer_StreamFlags, &regs, &regs);
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322
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323 buffer = (Uint8 *)malloc(sizeof(Uint8) * spec->size);
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324 if (buffer == NULL)
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325 {
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326 SDL_OutOfMemory();
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327 return -1;
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328 }
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329
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330 #ifdef DISABLE_THREADS
630
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331 /* Hopefully returning 2 will show success, but not start up an audio thread */
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332 return 2;
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333 #else
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
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334 /* Success and start audio thread */
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
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335 return 0;
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336 #endif
630
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337 }
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338
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Sam Lantinga <slouken@libsdl.org>
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339 static void DRenderer_CloseAudio(_THIS)
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340 {
955
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341 DeactivateAudio();
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342 }
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Sam Lantinga <slouken@libsdl.org>
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343
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344 #ifndef DISABLE_THREADS
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345
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diff changeset
346 /* Routines for threaded version of audio */
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347
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348 void DRenderer_WaitAudio(_THIS)
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349 {
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
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350 _kernel_swi_regs regs;
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351 int waiting = 1;
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
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352
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353 while (waiting)
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
354 {
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
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355 /* Check filled buffers count */
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
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356 _kernel_swi(DigitalRenderer_StreamStatistics, &regs, &regs);
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
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diff changeset
357 #if 0
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
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358 if (regs.r[0] <= FillBuffer)
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359 {
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360 printf("Buffers in use %d\n", regs.r[0]);
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diff changeset
361 }
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
Sam Lantinga <slouken@libsdl.org>
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diff changeset
362 #endif
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
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diff changeset
363 if (regs.r[0] <= FillBuffer) waiting = 0;
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
Sam Lantinga <slouken@libsdl.org>
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diff changeset
364 else pthread_yield();
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
Sam Lantinga <slouken@libsdl.org>
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diff changeset
365 }
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
Sam Lantinga <slouken@libsdl.org>
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diff changeset
366 }
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
Sam Lantinga <slouken@libsdl.org>
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diff changeset
367
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
Sam Lantinga <slouken@libsdl.org>
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diff changeset
368 Uint8 *DRenderer_GetAudioBuf(_THIS)
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
Sam Lantinga <slouken@libsdl.org>
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diff changeset
369 {
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
Sam Lantinga <slouken@libsdl.org>
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diff changeset
370 return buffer;
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
Sam Lantinga <slouken@libsdl.org>
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diff changeset
371 }
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
Sam Lantinga <slouken@libsdl.org>
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diff changeset
372
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
Sam Lantinga <slouken@libsdl.org>
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diff changeset
373 void DRenderer_PlayAudio(_THIS)
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
Sam Lantinga <slouken@libsdl.org>
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diff changeset
374 {
630
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diff changeset
375 _kernel_swi_regs regs;
550bccdf04bd Added initial support for RISC OS (thanks Peter Naulls!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
376
955
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diff changeset
377 regs.r[0] = (int)buffer;
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
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diff changeset
378 regs.r[1] = current_audio->spec.samples * current_audio->spec.channels;
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
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diff changeset
379 _kernel_swi(DigitalRenderer_Stream16BitSamples, &regs, &regs);
630
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
380 }
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
381
955
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diff changeset
382 #endif