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annotate src/audio/dc/SDL_dcaudio.c @ 571:8e3ce997621c

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Date: Thu, 16 Jan 2003 13:48:31 +0200 From: "Mike Gorchak" Subject: All QNX patches whole patches concerning QNX. Almost all code has been rewritten by Julian and me. Added initial support for hw overlays in QNX and many many others fixes. P.S. This patches has been reviewed by Dave Rempel from QSSL and included in SDL 1.2.5 distribution, which coming on 3rd party CD for newest 6.2.1 version of QNX, which will be available soon.
author Sam Lantinga <slouken@libsdl.org>
date Mon, 20 Jan 2003 01:38:37 +0000
parents dad72daf44b3
children b8d311d90021
rev   line source
509
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 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 BERO <bero@geocities.co.jp>
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20 based on SDL_diskaudio.c by Sam Lantinga <slouken@libsdl.org>
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21
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22 */
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23
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24 #ifdef SAVE_RCSID
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25 static char rcsid =
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26 "@(#) $Id$";
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27 #endif
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28
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29 /* Output dreamcast aica */
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30
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31 #include <stdlib.h>
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32 #include <stdio.h>
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33 #include <string.h>
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34 #include <errno.h>
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35 #include <unistd.h>
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36 #include <sys/stat.h>
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37 #include <sys/types.h>
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38 #include <sys/stat.h>
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39 #include <fcntl.h>
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40
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41
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42 #include "SDL_audio.h"
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43 #include "SDL_error.h"
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44 #include "SDL_audiomem.h"
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45 #include "SDL_audio_c.h"
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46 #include "SDL_timer.h"
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47 #include "SDL_audiodev_c.h"
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48 #include "SDL_dcaudio.h"
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49
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50 #include "aica.h"
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51 #include <dc/spu.h>
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52
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53 /* Audio driver functions */
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54 static int DCAUD_OpenAudio(_THIS, SDL_AudioSpec *spec);
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55 static void DCAUD_WaitAudio(_THIS);
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56 static void DCAUD_PlayAudio(_THIS);
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57 static Uint8 *DCAUD_GetAudioBuf(_THIS);
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58 static void DCAUD_CloseAudio(_THIS);
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59
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60 /* Audio driver bootstrap functions */
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61 static int DCAUD_Available(void)
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62 {
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63 return 1;
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64 }
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65
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66 static void DCAUD_DeleteDevice(SDL_AudioDevice *device)
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67 {
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68 free(device->hidden);
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69 free(device);
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70 }
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71
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72 static SDL_AudioDevice *DCAUD_CreateDevice(int devindex)
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73 {
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74 SDL_AudioDevice *this;
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75
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76 /* Initialize all variables that we clean on shutdown */
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77 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice));
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78 if ( this ) {
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79 memset(this, 0, (sizeof *this));
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80 this->hidden = (struct SDL_PrivateAudioData *)
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81 malloc((sizeof *this->hidden));
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82 }
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83 if ( (this == NULL) || (this->hidden == NULL) ) {
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84 SDL_OutOfMemory();
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85 if ( this ) {
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86 free(this);
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87 }
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88 return(0);
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89 }
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90 memset(this->hidden, 0, (sizeof *this->hidden));
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91
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92 /* Set the function pointers */
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93 this->OpenAudio = DCAUD_OpenAudio;
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94 this->WaitAudio = DCAUD_WaitAudio;
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95 this->PlayAudio = DCAUD_PlayAudio;
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96 this->GetAudioBuf = DCAUD_GetAudioBuf;
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97 this->CloseAudio = DCAUD_CloseAudio;
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98
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99 this->free = DCAUD_DeleteDevice;
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100
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101 spu_init();
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102
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103 return this;
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104 }
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105
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106 AudioBootStrap DCAUD_bootstrap = {
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107 "dcaudio", "Dreamcast AICA audio",
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108 DCAUD_Available, DCAUD_CreateDevice
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109 };
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110
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111 /* This function waits until it is possible to write a full sound buffer */
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112 static void DCAUD_WaitAudio(_THIS)
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113 {
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114 if (this->hidden->playing) {
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115 /* wait */
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116 while(aica_get_pos(0)/this->spec.samples == this->hidden->nextbuf) {
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117 thd_pass();
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118 }
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119 }
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120 }
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121
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122 #define SPU_RAM_BASE 0xa0800000
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123
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124 static void spu_memload_stereo8(int leftpos,int rightpos,void *src0,size_t size)
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125 {
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126 uint8 *src = src0;
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127 uint32 *left = (uint32*)(leftpos +SPU_RAM_BASE);
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128 uint32 *right = (uint32*)(rightpos+SPU_RAM_BASE);
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129 size = (size+7)/8;
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130 while(size--) {
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131 unsigned lval,rval;
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132 lval = *src++;
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133 rval = *src++;
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134 lval|= (*src++)<<8;
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135 rval|= (*src++)<<8;
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136 lval|= (*src++)<<16;
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137 rval|= (*src++)<<16;
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138 lval|= (*src++)<<24;
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139 rval|= (*src++)<<24;
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140 g2_write_32(left++,lval);
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141 g2_write_32(right++,rval);
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142 g2_fifo_wait();
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143 }
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144 }
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145
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146 static void spu_memload_stereo16(int leftpos,int rightpos,void *src0,size_t size)
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147 {
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148 uint16 *src = src0;
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149 uint32 *left = (uint32*)(leftpos +SPU_RAM_BASE);
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150 uint32 *right = (uint32*)(rightpos+SPU_RAM_BASE);
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151 size = (size+7)/8;
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152 while(size--) {
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153 unsigned lval,rval;
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154 lval = *src++;
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155 rval = *src++;
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156 lval|= (*src++)<<16;
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157 rval|= (*src++)<<16;
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158 g2_write_32(left++,lval);
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159 g2_write_32(right++,rval);
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160 g2_fifo_wait();
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161 }
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162 }
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163
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164 static void DCAUD_PlayAudio(_THIS)
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165 {
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166 SDL_AudioSpec *spec = &this->spec;
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167 unsigned int offset;
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168
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169 if (this->hidden->playing) {
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170 /* wait */
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171 while(aica_get_pos(0)/spec->samples == this->hidden->nextbuf) {
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172 thd_pass();
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173 }
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174 }
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175
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176 offset = this->hidden->nextbuf*spec->size;
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177 this->hidden->nextbuf^=1;
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178 /* Write the audio data, checking for EAGAIN on broken audio drivers */
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179 if (spec->channels==1) {
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180 spu_memload(this->hidden->leftpos+offset,this->hidden->mixbuf,this->hidden->mixlen);
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181 } else {
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182 offset/=2;
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183 if ((this->spec.format&255)==8) {
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184 spu_memload_stereo8(this->hidden->leftpos+offset,this->hidden->rightpos+offset,this->hidden->mixbuf,this->hidden->mixlen);
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185 } else {
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186 spu_memload_stereo16(this->hidden->leftpos+offset,this->hidden->rightpos+offset,this->hidden->mixbuf,this->hidden->mixlen);
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187 }
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188 }
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189
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190 if (!this->hidden->playing) {
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191 int mode;
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192 this->hidden->playing = 1;
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193 mode = (spec->format==AUDIO_S8)?SM_8BIT:SM_16BIT;
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194 if (spec->channels==1) {
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195 aica_play(0,mode,this->hidden->leftpos,0,spec->samples*2,spec->freq,255,128,1);
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196 } else {
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197 aica_play(0,mode,this->hidden->leftpos ,0,spec->samples*2,spec->freq,255,0,1);
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198 aica_play(1,mode,this->hidden->rightpos,0,spec->samples*2,spec->freq,255,255,1);
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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 static Uint8 *DCAUD_GetAudioBuf(_THIS)
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204 {
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205 return(this->hidden->mixbuf);
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206 }
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207
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208 static void DCAUD_CloseAudio(_THIS)
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209 {
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210 aica_stop(0);
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211 if (this->spec.channels==2) aica_stop(1);
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212 if ( this->hidden->mixbuf != NULL ) {
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213 SDL_FreeAudioMem(this->hidden->mixbuf);
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214 this->hidden->mixbuf = NULL;
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215 }
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216 }
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217
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218 static int DCAUD_OpenAudio(_THIS, SDL_AudioSpec *spec)
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219 {
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220 switch(spec->format&0xff) {
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221 case 8: spec->format = AUDIO_S8; break;
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222 case 16: spec->format = AUDIO_S16LSB; break;
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223 default:
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224 SDL_SetError("Unsupported audio format");
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225 return(-1);
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226 }
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227
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diff changeset
228 /* Update the fragment size as size in bytes */
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229 SDL_CalculateAudioSpec(spec);
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230
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231 /* Allocate mixing buffer */
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232 this->hidden->mixlen = spec->size;
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diff changeset
233 this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen);
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diff changeset
234 if ( this->hidden->mixbuf == NULL ) {
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235 return(-1);
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diff changeset
236 }
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diff changeset
237 memset(this->hidden->mixbuf, spec->silence, spec->size);
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238 this->hidden->leftpos = 0x11000;
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239 this->hidden->rightpos = 0x11000+spec->size;
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240 this->hidden->playing = 0;
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diff changeset
241 this->hidden->nextbuf = 0;
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242
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diff changeset
243 /* We're ready to rock and roll. :-) */
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diff changeset
244 return(0);
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245 }