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annotate src/audio/riscos/SDL_drenderer.c @ 644:594422ab8f9f

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Atari MiNT: added more audio drivers
author Patrice Mandin <patmandin@gmail.com>
date Mon, 07 Jul 2003 19:16:03 +0000
parents 550bccdf04bd
children b8d311d90021
rev   line source
630
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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 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 #define DigitalRenderer_Activate 0x4F700
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39 #define DigitalRenderer_Deactivate 0x4F701
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40 #define DigitalRenderer_ReadState 0x4F705
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41 #define DigitalRenderer_NewSample 0x4F706
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42 #define DigitalRenderer_NumBuffers 0x4F709
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43 #define DigitalRenderer_StreamSamples 0x4F70A
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44 #define DigitalRenderer_Stream16BitSamples 0x4F70B
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45 #define DigitalRenderer_StreamStatistics 0x4F70C
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46 #define DigitalRenderer_StreamFlags 0x4F70D
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47 #define DigitalRenderer_Activate16 0x4F70F
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48 #define DigitalRenderer_GetFrequency 0x4F710
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49
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50 static int FillBuffer;
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51 extern SDL_AudioDevice *current_audio;
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52
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53 extern int riscos_audiobuffer; /* Override for audio buffer size */
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54
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55 /* Audio driver functions */
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56
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57 static void DRenderer_CloseAudio(_THIS);
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58 static int DRenderer_OpenAudio(_THIS, SDL_AudioSpec *spec);
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59
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60 /* Audio driver bootstrap functions */
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61
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62 /* Define following to dump stats to stdout */
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63 /* #define DUMP_AUDIO */
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64
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65
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66 static int Audio_Available(void)
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67 {
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68 _kernel_swi_regs regs;
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69 int available = 0;
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70
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71 /* Use call to set buffers to also check if Module is loaded */
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72 regs.r[0] = 0;
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73 if (_kernel_swi(DigitalRenderer_NumBuffers, &regs, &regs) == 0) available = 1;
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74
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75 return(available);
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76 }
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77
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78 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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79 {
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80 free(device->hidden);
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81 free(device);
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82 }
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83
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84 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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85 {
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86 SDL_AudioDevice *this;
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87
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88 /* Initialize all variables that we clean on shutdown */
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89 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice));
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90 if ( this ) {
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91 memset(this, 0, (sizeof *this));
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92 this->hidden = (struct SDL_PrivateAudioData *)
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93 malloc((sizeof *this->hidden));
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94 }
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95 if ( (this == NULL) || (this->hidden == NULL) ) {
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96 SDL_OutOfMemory();
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97 if ( this ) {
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98 free(this);
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99 }
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100 return(0);
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101 }
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102 memset(this->hidden, 0, (sizeof *this->hidden));
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103
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104 /* Set the function pointers */
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105 this->OpenAudio = DRenderer_OpenAudio;
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106 this->CloseAudio = DRenderer_CloseAudio;
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107 this->free = Audio_DeleteDevice;
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108
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109 return this;
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110 }
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111
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112 AudioBootStrap DRENDERER_bootstrap = {
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113 "drenderer", "RiscOS Digital Renderer Module",
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114 Audio_Available, Audio_CreateDevice
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115 };
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116
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117 /* Routine called to check and fill audio buffers if necessary */
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118 static Uint8 *buffer = NULL;
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119
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120 void DRenderer_FillBuffers()
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121 {
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122 SDL_AudioDevice *audio = current_audio;
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123
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124 if ( !audio || ! audio->enabled )
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125 {
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126 return;
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127 }
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128
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129 if ( ! audio->paused )
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130 {
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131 _kernel_swi_regs regs;
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132 /* Check filled buffers count */
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133 _kernel_swi(DigitalRenderer_StreamStatistics, &regs, &regs);
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134
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135 #ifdef DUMP_AUDIO
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136 if (regs.r[0] <= FillBuffer)
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137 {
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138 printf("Buffers in use %d\n", regs.r[0]);
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139 }
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140 #endif
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141
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142 while (regs.r[0] <= FillBuffer && !audio->paused)
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143 {
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144 if ( audio->convert.needed )
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
145 {
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
146 int silence;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
147 if ( audio->convert.src_format == AUDIO_U8 )
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
148 {
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
149 silence = 0x80;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
150 } else {
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
151 silence = 0;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
152 }
550bccdf04bd Added initial support for RISC OS (thanks Peter Naulls!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
153 memset(audio->convert.buf, silence, audio->convert.len);
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
154 audio->spec.callback(audio->spec.userdata,
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
155 (Uint8 *)audio->convert.buf,audio->convert.len);
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
156 SDL_ConvertAudio(&audio->convert);
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
157 #if 0
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
158 if ( audio->convert.len_cvt != audio->spec.size ) {
550bccdf04bd Added initial support for RISC OS (thanks Peter Naulls!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
159 /* Uh oh... probably crashes here; */
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
160 }
550bccdf04bd Added initial support for RISC OS (thanks Peter Naulls!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
161 #endif
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
162 regs.r[0] = (int)audio->convert.buf;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
163 regs.r[1] = audio->spec.samples * audio->spec.channels;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
164 _kernel_swi(DigitalRenderer_Stream16BitSamples, &regs, &regs);
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
165
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
166 } else
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
167 {
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
168 /* Fill buffer with silence */
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
169 memset (buffer, 0, audio->spec.size);
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
170
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
171 audio->spec.callback(audio->spec.userdata,
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
172 (Uint8 *)buffer, audio->spec.size);
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
173
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
174 regs.r[0] = (int)buffer;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
175 regs.r[1] = audio->spec.samples * audio->spec.channels;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
176 _kernel_swi(DigitalRenderer_Stream16BitSamples, &regs, &regs);
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
177 }
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
178 /* Check if we have enough buffers yet */
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
179 _kernel_swi(DigitalRenderer_StreamStatistics, &regs, &regs);
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
180 }
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
181
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
182 }
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
183 }
550bccdf04bd Added initial support for RISC OS (thanks Peter Naulls!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
184
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
185 /* Size of DMA buffer to use */
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
186 #define DRENDERER_BUFFER_SIZE 512
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
187
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
188 /* Number of centiseconds of sound to buffer.
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
189 Hopefully more than the maximum time between calls to the
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
190 FillBuffers routine above
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
191 */
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
192 #define DRENDERER_CSEC_TO_BUFFER 10
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
193
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
194 static int DRenderer_OpenAudio(_THIS, SDL_AudioSpec *spec)
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
195 {
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
196 _kernel_swi_regs regs;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
197 int buffers_per_sample;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
198
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
199 #ifdef DUMP_AUDIO
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
200 printf("Request format %d\n", spec->format);
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
201 printf("Request freq %d\n", spec->freq);
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
202 printf("Samples %d\n", spec->samples);
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
203 #endif
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
204
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
205 /* Only support signed 16bit format */
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
206 spec->format = AUDIO_S16LSB;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
207
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
208 if (spec->samples < DRENDERER_BUFFER_SIZE) spec->samples = DRENDERER_BUFFER_SIZE;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
209
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
210 SDL_CalculateAudioSpec(spec);
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
211
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
212
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
213 buffers_per_sample = spec->samples / DRENDERER_BUFFER_SIZE;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
214
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
215 if ((spec->samples % DRENDERER_BUFFER_SIZE) != 0)
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
216 {
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
217 buffers_per_sample++;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
218 spec->samples = buffers_per_sample * DRENDERER_BUFFER_SIZE;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
219 }
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
220
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
221 /* Set number of buffers to use - the following should give enough
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
222 data between calls to the sound polling.
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
223 */
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
224
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
225 if (riscos_audiobuffer == 0)
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
226 {
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
227 FillBuffer = (int)((double)DRENDERER_CSEC_TO_BUFFER / ((double)DRENDERER_BUFFER_SIZE * 100.0 / (double)spec->freq)) + 1;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
228 } else FillBuffer = riscos_audiobuffer/DRENDERER_BUFFER_SIZE - buffers_per_sample;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
229
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
230 if (FillBuffer < buffers_per_sample) FillBuffer = buffers_per_sample;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
231 regs.r[0] = FillBuffer + buffers_per_sample;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
232
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
233 #ifdef DUMP_AUDIO
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
234 printf("Buffers per sample %d\n", buffers_per_sample);
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
235 printf("Fill buffer %d\n", FillBuffer);
550bccdf04bd Added initial support for RISC OS (thanks Peter Naulls!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
236 printf("Time buffered (ms) %d\n",(int)((1000.0 * regs.r[0] * DRENDERER_BUFFER_SIZE)/(double)spec->freq));
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
237 #endif
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
238
550bccdf04bd Added initial support for RISC OS (thanks Peter Naulls!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
239 if (_kernel_swi(DigitalRenderer_NumBuffers, &regs, &regs) != 0)
550bccdf04bd Added initial support for RISC OS (thanks Peter Naulls!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
240 {
550bccdf04bd Added initial support for RISC OS (thanks Peter Naulls!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
241 SDL_SetError("Can't set number of streaming sound buffers\n");
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
242 return -1;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
243 }
550bccdf04bd Added initial support for RISC OS (thanks Peter Naulls!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
244
550bccdf04bd Added initial support for RISC OS (thanks Peter Naulls!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
245 /* Now initialise sound system */
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
246 regs.r[0] = spec->channels; /* Number of channels */
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
247 regs.r[1] = DRENDERER_BUFFER_SIZE; /* Samples length */
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
248 regs.r[2] = spec->freq; /* frequency */
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
249 regs.r[3] = 1; /* Restore previous handler on exit */
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
250
550bccdf04bd Added initial support for RISC OS (thanks Peter Naulls!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
251 if (_kernel_swi(DigitalRenderer_Activate16, &regs, &regs) != 0)
550bccdf04bd Added initial support for RISC OS (thanks Peter Naulls!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
252 {
550bccdf04bd Added initial support for RISC OS (thanks Peter Naulls!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
253 SDL_SetError("Unable to activate digital renderer in 16 bit mode\n");
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
254 return -1;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
255 }
550bccdf04bd Added initial support for RISC OS (thanks Peter Naulls!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
256
550bccdf04bd Added initial support for RISC OS (thanks Peter Naulls!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
257 if (_kernel_swi(DigitalRenderer_GetFrequency, &regs, &regs) == 0)
550bccdf04bd Added initial support for RISC OS (thanks Peter Naulls!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
258 {
550bccdf04bd Added initial support for RISC OS (thanks Peter Naulls!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
259 spec->freq = regs.r[0];
550bccdf04bd Added initial support for RISC OS (thanks Peter Naulls!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
260 }
550bccdf04bd Added initial support for RISC OS (thanks Peter Naulls!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
261
550bccdf04bd Added initial support for RISC OS (thanks Peter Naulls!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
262 #ifdef DUMP_AUDIO
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
263 printf("Got format %d\n", spec->format);
550bccdf04bd Added initial support for RISC OS (thanks Peter Naulls!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
264 printf("Frequency %d\n", spec->freq);
550bccdf04bd Added initial support for RISC OS (thanks Peter Naulls!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
265 printf("Samples %d\n", spec->samples);
550bccdf04bd Added initial support for RISC OS (thanks Peter Naulls!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
266 #endif
550bccdf04bd Added initial support for RISC OS (thanks Peter Naulls!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
267
550bccdf04bd Added initial support for RISC OS (thanks Peter Naulls!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
268 /* Set to fill buffer with zero if we don't get data to it fast enough */
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
269 regs.r[0] = 1;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
270 regs.r[1] = ~1;
550bccdf04bd Added initial support for RISC OS (thanks Peter Naulls!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
271 _kernel_swi(DigitalRenderer_StreamFlags, &regs, &regs);
550bccdf04bd Added initial support for RISC OS (thanks Peter Naulls!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
272
550bccdf04bd Added initial support for RISC OS (thanks Peter Naulls!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
273 buffer = (Uint8 *)malloc(sizeof(Uint8) * spec->size);
550bccdf04bd Added initial support for RISC OS (thanks Peter Naulls!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
274 if (buffer == NULL)
550bccdf04bd Added initial support for RISC OS (thanks Peter Naulls!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
275 {
550bccdf04bd Added initial support for RISC OS (thanks Peter Naulls!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
276 SDL_OutOfMemory();
550bccdf04bd Added initial support for RISC OS (thanks Peter Naulls!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
277 return -1;
550bccdf04bd Added initial support for RISC OS (thanks Peter Naulls!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
278 }
550bccdf04bd Added initial support for RISC OS (thanks Peter Naulls!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
279
550bccdf04bd Added initial support for RISC OS (thanks Peter Naulls!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
280 /* Hopefully returning 2 will show success, but not start up an audio thread */
550bccdf04bd Added initial support for RISC OS (thanks Peter Naulls!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
281 return 2;
550bccdf04bd Added initial support for RISC OS (thanks Peter Naulls!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
282 }
550bccdf04bd Added initial support for RISC OS (thanks Peter Naulls!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
283
550bccdf04bd Added initial support for RISC OS (thanks Peter Naulls!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
284 static void DRenderer_CloseAudio(_THIS)
550bccdf04bd Added initial support for RISC OS (thanks Peter Naulls!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
285 {
550bccdf04bd Added initial support for RISC OS (thanks Peter Naulls!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
286 _kernel_swi_regs regs;
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287
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288 /* Close down the digital renderer */
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289 _kernel_swi(DigitalRenderer_Deactivate, &regs, &regs);
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290
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291 if (buffer != NULL) free(buffer);
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292 }
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293