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annotate src/audio/dc/SDL_dcaudio.c @ 4165:3b8ac3d311a2 SDL-1.2

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Hello. This patch provides basic support for video on the Sony PS3 Linux framebuffer. Scaling, format-conversion, and drawing is done from the SPEs, so there is little performance impact to PPE applications. This is by no means production quality code, but it is a very good start and a good example of how to use the PS3's hardware capabilities to accelerate video playback on the box. The driver has been verified to work with ffplay, mplayer and xine. This piece of software has been developed at the IBM R&D Lab in Boeblingen, Germany and is now returned to the community. Enjoy ! Signed-off-by: D.Herrendoerfer < d.herrendoerfer [at] de [dot] ibm [dot] com >
author Sam Lantinga <slouken@libsdl.org>
date Thu, 02 Apr 2009 04:06:55 +0000
parents a1b03ba2fcd0
children
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 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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18
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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 */
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23 #include "SDL_config.h"
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24
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25 /* Output dreamcast aica */
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26
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27 #include "SDL_timer.h"
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28 #include "SDL_audio.h"
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29 #include "../SDL_audiomem.h"
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30 #include "../SDL_audio_c.h"
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31 #include "../SDL_audiodev_c.h"
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32 #include "SDL_dcaudio.h"
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33
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34 #include "aica.h"
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35 #include <dc/spu.h>
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36
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37 /* Audio driver functions */
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38 static int DCAUD_OpenAudio(_THIS, SDL_AudioSpec *spec);
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39 static void DCAUD_WaitAudio(_THIS);
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40 static void DCAUD_PlayAudio(_THIS);
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41 static Uint8 *DCAUD_GetAudioBuf(_THIS);
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42 static void DCAUD_CloseAudio(_THIS);
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43
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44 /* Audio driver bootstrap functions */
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45 static int DCAUD_Available(void)
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46 {
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47 return 1;
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48 }
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49
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50 static void DCAUD_DeleteDevice(SDL_AudioDevice *device)
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51 {
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52 SDL_free(device->hidden);
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53 SDL_free(device);
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54 }
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55
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56 static SDL_AudioDevice *DCAUD_CreateDevice(int devindex)
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57 {
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58 SDL_AudioDevice *this;
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59
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60 /* Initialize all variables that we clean on shutdown */
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61 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice));
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62 if ( this ) {
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63 SDL_memset(this, 0, (sizeof *this));
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64 this->hidden = (struct SDL_PrivateAudioData *)
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65 SDL_malloc((sizeof *this->hidden));
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66 }
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67 if ( (this == NULL) || (this->hidden == NULL) ) {
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68 SDL_OutOfMemory();
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69 if ( this ) {
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70 SDL_free(this);
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71 }
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72 return(0);
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73 }
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74 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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75
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76 /* Set the function pointers */
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77 this->OpenAudio = DCAUD_OpenAudio;
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78 this->WaitAudio = DCAUD_WaitAudio;
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79 this->PlayAudio = DCAUD_PlayAudio;
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80 this->GetAudioBuf = DCAUD_GetAudioBuf;
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81 this->CloseAudio = DCAUD_CloseAudio;
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82
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83 this->free = DCAUD_DeleteDevice;
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84
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85 spu_init();
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86
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87 return this;
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88 }
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89
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90 AudioBootStrap DCAUD_bootstrap = {
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91 "dcaudio", "Dreamcast AICA audio",
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92 DCAUD_Available, DCAUD_CreateDevice
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93 };
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94
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95 /* This function waits until it is possible to write a full sound buffer */
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96 static void DCAUD_WaitAudio(_THIS)
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97 {
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98 if (this->hidden->playing) {
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99 /* wait */
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100 while(aica_get_pos(0)/this->spec.samples == this->hidden->nextbuf) {
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101 thd_pass();
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102 }
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103 }
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104 }
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105
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106 #define SPU_RAM_BASE 0xa0800000
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107
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108 static void spu_memload_stereo8(int leftpos,int rightpos,void *src0,size_t size)
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109 {
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110 uint8 *src = src0;
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111 uint32 *left = (uint32*)(leftpos +SPU_RAM_BASE);
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112 uint32 *right = (uint32*)(rightpos+SPU_RAM_BASE);
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113 size = (size+7)/8;
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114 while(size--) {
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115 unsigned lval,rval;
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116 lval = *src++;
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117 rval = *src++;
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118 lval|= (*src++)<<8;
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119 rval|= (*src++)<<8;
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120 lval|= (*src++)<<16;
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121 rval|= (*src++)<<16;
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122 lval|= (*src++)<<24;
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123 rval|= (*src++)<<24;
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124 g2_write_32(left++,lval);
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125 g2_write_32(right++,rval);
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126 g2_fifo_wait();
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127 }
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128 }
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129
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130 static void spu_memload_stereo16(int leftpos,int rightpos,void *src0,size_t size)
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131 {
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132 uint16 *src = src0;
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133 uint32 *left = (uint32*)(leftpos +SPU_RAM_BASE);
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134 uint32 *right = (uint32*)(rightpos+SPU_RAM_BASE);
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135 size = (size+7)/8;
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136 while(size--) {
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137 unsigned lval,rval;
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138 lval = *src++;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
139 rval = *src++;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
140 lval|= (*src++)<<16;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
141 rval|= (*src++)<<16;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
142 g2_write_32(left++,lval);
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
143 g2_write_32(right++,rval);
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
144 g2_fifo_wait();
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
145 }
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
146 }
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!)
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parents:
diff changeset
147
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!)
Sam Lantinga <slouken@libsdl.org>
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diff changeset
148 static void DCAUD_PlayAudio(_THIS)
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149 {
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150 SDL_AudioSpec *spec = &this->spec;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
151 unsigned int offset;
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parents:
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152
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153 if (this->hidden->playing) {
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parents:
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154 /* wait */
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Sam Lantinga <slouken@libsdl.org>
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155 while(aica_get_pos(0)/spec->samples == this->hidden->nextbuf) {
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
156 thd_pass();
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
157 }
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
158 }
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!)
Sam Lantinga <slouken@libsdl.org>
parents:
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159
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!)
Sam Lantinga <slouken@libsdl.org>
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160 offset = this->hidden->nextbuf*spec->size;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
161 this->hidden->nextbuf^=1;
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Sam Lantinga <slouken@libsdl.org>
parents:
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162 /* Write the audio data, checking for EAGAIN on broken audio drivers */
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
163 if (spec->channels==1) {
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Sam Lantinga <slouken@libsdl.org>
parents:
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164 spu_memload(this->hidden->leftpos+offset,this->hidden->mixbuf,this->hidden->mixlen);
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parents:
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165 } else {
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
166 offset/=2;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
167 if ((this->spec.format&255)==8) {
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Sam Lantinga <slouken@libsdl.org>
parents:
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168 spu_memload_stereo8(this->hidden->leftpos+offset,this->hidden->rightpos+offset,this->hidden->mixbuf,this->hidden->mixlen);
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parents:
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169 } else {
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Sam Lantinga <slouken@libsdl.org>
parents:
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170 spu_memload_stereo16(this->hidden->leftpos+offset,this->hidden->rightpos+offset,this->hidden->mixbuf,this->hidden->mixlen);
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parents:
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171 }
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parents:
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172 }
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parents:
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173
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!)
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parents:
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174 if (!this->hidden->playing) {
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
175 int mode;
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176 this->hidden->playing = 1;
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177 mode = (spec->format==AUDIO_S8)?SM_8BIT:SM_16BIT;
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178 if (spec->channels==1) {
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parents:
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179 aica_play(0,mode,this->hidden->leftpos,0,spec->samples*2,spec->freq,255,128,1);
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parents:
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180 } else {
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parents:
diff changeset
181 aica_play(0,mode,this->hidden->leftpos ,0,spec->samples*2,spec->freq,255,0,1);
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parents:
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182 aica_play(1,mode,this->hidden->rightpos,0,spec->samples*2,spec->freq,255,255,1);
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183 }
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parents:
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184 }
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
185 }
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parents:
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186
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187 static Uint8 *DCAUD_GetAudioBuf(_THIS)
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188 {
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189 return(this->hidden->mixbuf);
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parents:
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190 }
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parents:
diff changeset
191
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diff changeset
192 static void DCAUD_CloseAudio(_THIS)
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parents:
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193 {
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194 aica_stop(0);
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diff changeset
195 if (this->spec.channels==2) aica_stop(1);
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diff changeset
196 if ( this->hidden->mixbuf != NULL ) {
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diff changeset
197 SDL_FreeAudioMem(this->hidden->mixbuf);
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diff changeset
198 this->hidden->mixbuf = NULL;
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diff changeset
199 }
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parents:
diff changeset
200 }
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parents:
diff changeset
201
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parents:
diff changeset
202 static int DCAUD_OpenAudio(_THIS, SDL_AudioSpec *spec)
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parents:
diff changeset
203 {
3852
5b5e549382b3 Removed some new 1.3 symbols from code backported to 1.2.
Ryan C. Gordon <icculus@icculus.org>
parents: 3851
diff changeset
204 Uint16 test_format = SDL_FirstAudioFormat(spec->format);
3851
405a192b68e7 Backport from 1.3: most of the audio drivers can now handle data
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parents: 1461
diff changeset
205 int valid_datatype = 0;
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parents: 1461
diff changeset
206 while ((!valid_datatype) && (test_format)) {
405a192b68e7 Backport from 1.3: most of the audio drivers can now handle data
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parents: 1461
diff changeset
207 spec->format = test_format;
405a192b68e7 Backport from 1.3: most of the audio drivers can now handle data
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parents: 1461
diff changeset
208 switch (test_format) {
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parents: 1461
diff changeset
209 /* only formats Dreamcast accepts... */
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parents: 1461
diff changeset
210 case AUDIO_S8:
405a192b68e7 Backport from 1.3: most of the audio drivers can now handle data
Ryan C. Gordon <icculus@icculus.org>
parents: 1461
diff changeset
211 case AUDIO_S16LSB:
405a192b68e7 Backport from 1.3: most of the audio drivers can now handle data
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parents: 1461
diff changeset
212 valid_datatype = 1;
405a192b68e7 Backport from 1.3: most of the audio drivers can now handle data
Ryan C. Gordon <icculus@icculus.org>
parents: 1461
diff changeset
213 break;
405a192b68e7 Backport from 1.3: most of the audio drivers can now handle data
Ryan C. Gordon <icculus@icculus.org>
parents: 1461
diff changeset
214
405a192b68e7 Backport from 1.3: most of the audio drivers can now handle data
Ryan C. Gordon <icculus@icculus.org>
parents: 1461
diff changeset
215 default:
405a192b68e7 Backport from 1.3: most of the audio drivers can now handle data
Ryan C. Gordon <icculus@icculus.org>
parents: 1461
diff changeset
216 test_format = SDL_NextAudioFormat();
405a192b68e7 Backport from 1.3: most of the audio drivers can now handle data
Ryan C. Gordon <icculus@icculus.org>
parents: 1461
diff changeset
217 break;
405a192b68e7 Backport from 1.3: most of the audio drivers can now handle data
Ryan C. Gordon <icculus@icculus.org>
parents: 1461
diff changeset
218 }
405a192b68e7 Backport from 1.3: most of the audio drivers can now handle data
Ryan C. Gordon <icculus@icculus.org>
parents: 1461
diff changeset
219 }
405a192b68e7 Backport from 1.3: most of the audio drivers can now handle data
Ryan C. Gordon <icculus@icculus.org>
parents: 1461
diff changeset
220
405a192b68e7 Backport from 1.3: most of the audio drivers can now handle data
Ryan C. Gordon <icculus@icculus.org>
parents: 1461
diff changeset
221 if (!valid_datatype) { /* shouldn't happen, but just in case... */
405a192b68e7 Backport from 1.3: most of the audio drivers can now handle data
Ryan C. Gordon <icculus@icculus.org>
parents: 1461
diff changeset
222 SDL_SetError("Unsupported audio format");
405a192b68e7 Backport from 1.3: most of the audio drivers can now handle data
Ryan C. Gordon <icculus@icculus.org>
parents: 1461
diff changeset
223 return (-1);
405a192b68e7 Backport from 1.3: most of the audio drivers can now handle data
Ryan C. Gordon <icculus@icculus.org>
parents: 1461
diff changeset
224 }
405a192b68e7 Backport from 1.3: most of the audio drivers can now handle data
Ryan C. Gordon <icculus@icculus.org>
parents: 1461
diff changeset
225
405a192b68e7 Backport from 1.3: most of the audio drivers can now handle data
Ryan C. Gordon <icculus@icculus.org>
parents: 1461
diff changeset
226 if (spec->channels > 2)
405a192b68e7 Backport from 1.3: most of the audio drivers can now handle data
Ryan C. Gordon <icculus@icculus.org>
parents: 1461
diff changeset
227 spec->channels = 2; /* no more than stereo on the Dreamcast. */
509
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!)
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parents:
diff changeset
228
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
229 /* Update the fragment size as size in bytes */
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
230 SDL_CalculateAudioSpec(spec);
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
231
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
232 /* Allocate mixing buffer */
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
233 this->hidden->mixlen = spec->size;
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
234 this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen);
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
235 if ( this->hidden->mixbuf == NULL ) {
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
236 return(-1);
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
237 }
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents: 1312
diff changeset
238 SDL_memset(this->hidden->mixbuf, spec->silence, spec->size);
509
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
239 this->hidden->leftpos = 0x11000;
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
240 this->hidden->rightpos = 0x11000+spec->size;
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
241 this->hidden->playing = 0;
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
242 this->hidden->nextbuf = 0;
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
243
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
244 /* We're ready to rock and roll. :-) */
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
245 return(0);
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
246 }