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annotate src/audio/mint/SDL_mintaudio_gsxb.c @ 961:185acc07127a

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Date: Fri, 29 Oct 2004 11:47:09 +0200 From: Patrice Mandin Subject: Reworked audio drivers for Atari platform These are reworked audio drivers for the Atari platform. Previous drivers were missing some features: - Test external clock plugged to DSP port on Atari Falcon 030. - Ability to select internal or external clock. So now, I generate a list of frequencies available, with the master clock and predivisor to use. One big caveat to this: I do not have an external clock, so I hope it works.
author Patrice Mandin <patmandin@gmail.com>
date Fri, 29 Oct 2004 09:56:53 +0000
parents b8d311d90021
children 176240cf4405
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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b8d311d90021 Updated copyright information for 2004 (Happy New Year!)
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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@libsdl.org
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21 */
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22
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23 /*
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24 MiNT audio driver
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25 using XBIOS functions (GSXB compatible driver)
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26
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27 Patrice Mandin
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28 */
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29
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30 #include <stdlib.h>
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31 #include <stdio.h>
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32 #include <string.h>
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33
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34 /* Mint includes */
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35 #include <mint/osbind.h>
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36 #include <mint/falcon.h>
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37 #include <mint/cookie.h>
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38
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39 #include "SDL_endian.h"
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40 #include "SDL_audio.h"
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41 #include "SDL_audio_c.h"
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42 #include "SDL_audiomem.h"
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43 #include "SDL_sysaudio.h"
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44
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45 #include "SDL_atarimxalloc_c.h"
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46
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47 #include "SDL_mintaudio.h"
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48 #include "SDL_mintaudio_gsxb.h"
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49
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50 /*--- Defines ---*/
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51
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52 #define MINT_AUDIO_DRIVER_NAME "mint_gsxb"
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53
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54 /* Debug print info */
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55 #define DEBUG_NAME "audio:gsxb: "
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56 #if 1
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57 #define DEBUG_PRINT(what) \
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58 { \
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59 printf what; \
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60 }
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61 #else
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62 #define DEBUG_PRINT(what)
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63 #endif
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64
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65 /*--- Static variables ---*/
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66
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67 static unsigned long cookie_snd, cookie_gsxb;
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68
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69 /*--- Audio driver functions ---*/
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70
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71 static void Mint_CloseAudio(_THIS);
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72 static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec);
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73 static void Mint_LockAudio(_THIS);
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74 static void Mint_UnlockAudio(_THIS);
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75
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76 /* To check/init hardware audio */
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77 static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec);
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78 static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec);
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79
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80 /*--- Audio driver bootstrap functions ---*/
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81
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82 static int Audio_Available(void)
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83 {
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84 const char *envr = getenv("SDL_AUDIODRIVER");
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85
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86 /* Check if user asked a different audio driver */
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87 if ((envr) && (strcmp(envr, MINT_AUDIO_DRIVER_NAME)!=0)) {
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88 DEBUG_PRINT((DEBUG_NAME "user asked a different audio driver\n"));
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89 return(0);
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90 }
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91
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92 /* Cookie _SND present ? if not, assume ST machine */
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93 if (Getcookie(C__SND, &cookie_snd) == C_NOTFOUND) {
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94 cookie_snd = SND_PSG;
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95 }
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96
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97 /* Check if we have 16 bits audio */
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98 if ((cookie_snd & SND_16BIT)==0) {
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99 DEBUG_PRINT((DEBUG_NAME "no 16 bits sound\n"));
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100 return(0);
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101 }
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102
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103 /* Cookie GSXB present ? */
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104 cookie_gsxb = (Getcookie(C_GSXB, &cookie_gsxb) == C_FOUND);
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105
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106 /* Is it GSXB ? */
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107 if (((cookie_snd & SND_GSXB)==0) || (cookie_gsxb==0)) {
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108 DEBUG_PRINT((DEBUG_NAME "no GSXB audio\n"));
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109 return(0);
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110 }
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111
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112 /* Check if audio is lockable */
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113 if (Locksnd()!=1) {
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114 DEBUG_PRINT((DEBUG_NAME "audio locked by other application\n"));
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115 return(0);
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116 }
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117
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118 Unlocksnd();
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119
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120 DEBUG_PRINT((DEBUG_NAME "GSXB audio available!\n"));
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121 return(1);
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122 }
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123
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124 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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125 {
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126 free(device->hidden);
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127 free(device);
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128 }
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129
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130 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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131 {
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132 SDL_AudioDevice *this;
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133
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134 /* Initialize all variables that we clean on shutdown */
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135 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice));
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136 if ( this ) {
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137 memset(this, 0, (sizeof *this));
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138 this->hidden = (struct SDL_PrivateAudioData *)
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139 malloc((sizeof *this->hidden));
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140 }
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141 if ( (this == NULL) || (this->hidden == NULL) ) {
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142 SDL_OutOfMemory();
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143 if ( this ) {
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144 free(this);
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145 }
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146 return(0);
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147 }
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148 memset(this->hidden, 0, (sizeof *this->hidden));
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149
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diff changeset
150 /* Set the function pointers */
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151 this->OpenAudio = Mint_OpenAudio;
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152 this->CloseAudio = Mint_CloseAudio;
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153 this->LockAudio = Mint_LockAudio;
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154 this->UnlockAudio = Mint_UnlockAudio;
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155 this->free = Audio_DeleteDevice;
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156
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157 return this;
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158 }
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diff changeset
159
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diff changeset
160 AudioBootStrap MINTAUDIO_GSXB_bootstrap = {
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diff changeset
161 MINT_AUDIO_DRIVER_NAME, "MiNT GSXB audio driver",
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diff changeset
162 Audio_Available, Audio_CreateDevice
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diff changeset
163 };
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164
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165 static void Mint_LockAudio(_THIS)
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166 {
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diff changeset
167 /* Stop replay */
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168 Buffoper(0);
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169 }
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170
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171 static void Mint_UnlockAudio(_THIS)
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172 {
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diff changeset
173 /* Restart replay */
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parents:
diff changeset
174 Buffoper(SB_PLA_ENA|SB_PLA_RPT);
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175 }
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176
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diff changeset
177 static void Mint_CloseAudio(_THIS)
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178 {
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179 /* Stop replay */
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180 Buffoper(0);
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181
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diff changeset
182 /* Uninstall interrupt */
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183 if (NSetinterrupt(2, SI_NONE, SDL_MintAudio_EmptyGsxbInterrupt)<0) {
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184 DEBUG_PRINT((DEBUG_NAME "NSetinterrupt() failed in close\n"));
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185 }
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186
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187 /* Wait if currently playing sound */
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188 while (SDL_MintAudio_mutex != 0) {
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189 }
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190
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diff changeset
191 /* Clear buffers */
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192 if (SDL_MintAudio_audiobuf[0]) {
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193 Mfree(SDL_MintAudio_audiobuf[0]);
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194 SDL_MintAudio_audiobuf[0] = SDL_MintAudio_audiobuf[1] = NULL;
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195 }
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196
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197 /* Unlock sound system */
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198 Unlocksnd();
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199 }
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200
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201 static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec)
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202 {
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203 long snd_format;
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204 int i, resolution, format_signed, format_bigendian;
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205
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206 resolution = spec->format & 0x00ff;
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207 format_signed = ((spec->format & 0x8000)!=0);
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208 format_bigendian = ((spec->format & 0x1000)!=0);
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diff changeset
209
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diff changeset
210 DEBUG_PRINT((DEBUG_NAME "asked: %d bits, ",spec->format & 0x00ff));
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diff changeset
211 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
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diff changeset
212 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
644
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213 DEBUG_PRINT(("channels=%d, ", spec->channels));
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214 DEBUG_PRINT(("freq=%d\n", spec->freq));
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215
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diff changeset
216 /* Check formats available */
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217 snd_format = Sndstatus(SND_QUERYFORMATS);
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diff changeset
218 switch (resolution) {
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diff changeset
219 case 8:
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diff changeset
220 if ((snd_format & SND_FORMAT8)==0) {
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diff changeset
221 SDL_SetError("Mint_CheckAudio: 8 bits samples not supported");
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222 return -1;
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diff changeset
223 }
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diff changeset
224 snd_format = Sndstatus(SND_QUERY8BIT);
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diff changeset
225 break;
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diff changeset
226 case 16:
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diff changeset
227 if ((snd_format & SND_FORMAT16)==0) {
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diff changeset
228 SDL_SetError("Mint_CheckAudio: 16 bits samples not supported");
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229 return -1;
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diff changeset
230 }
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diff changeset
231 snd_format = Sndstatus(SND_QUERY16BIT);
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diff changeset
232 break;
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diff changeset
233 default:
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diff changeset
234 SDL_SetError("Mint_CheckAudio: Unsupported sample resolution");
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235 return -1;
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parents:
diff changeset
236 break;
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parents:
diff changeset
237 }
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diff changeset
238
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diff changeset
239 /* Check signed/unsigned format */
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diff changeset
240 if (format_signed) {
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diff changeset
241 if (snd_format & SND_FORMATSIGNED) {
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parents:
diff changeset
242 /* Ok */
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parents:
diff changeset
243 } else if (snd_format & SND_FORMATUNSIGNED) {
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parents:
diff changeset
244 /* Give unsigned format */
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diff changeset
245 spec->format = spec->format & (~0x8000);
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diff changeset
246 }
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diff changeset
247 } else {
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diff changeset
248 if (snd_format & SND_FORMATUNSIGNED) {
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parents:
diff changeset
249 /* Ok */
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diff changeset
250 } else if (snd_format & SND_FORMATSIGNED) {
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parents:
diff changeset
251 /* Give signed format */
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diff changeset
252 spec->format |= 0x8000;
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253 }
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diff changeset
254 }
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diff changeset
255
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parents:
diff changeset
256 if (format_bigendian) {
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parents:
diff changeset
257 if (snd_format & SND_FORMATBIGENDIAN) {
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parents:
diff changeset
258 /* Ok */
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diff changeset
259 } else if (snd_format & SND_FORMATLITTLEENDIAN) {
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diff changeset
260 /* Give little endian format */
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diff changeset
261 spec->format = spec->format & (~0x1000);
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diff changeset
262 }
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diff changeset
263 } else {
704
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diff changeset
264 if (snd_format & SND_FORMATLITTLEENDIAN) {
644
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diff changeset
265 /* Ok */
704
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diff changeset
266 } else if (snd_format & SND_FORMATBIGENDIAN) {
644
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diff changeset
267 /* Give big endian format */
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diff changeset
268 spec->format |= 0x1000;
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diff changeset
269 }
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diff changeset
270 }
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parents:
diff changeset
271
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diff changeset
272 /* Calculate and select the closest frequency */
961
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
273 MINTAUDIO_freqcount=0;
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
274 for (i=1;i<4;i++) {
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diff changeset
275 SDL_MintAudio_AddFrequency(this, MASTERCLOCK_44K/(MASTERPREDIV_MILAN*(1<<i)), MASTERCLOCK_44K, (1<<i)-1);
644
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diff changeset
276 }
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diff changeset
277
961
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
278 #if 1
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
279 for (i=0; i<MINTAUDIO_freqcount; i++) {
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parents: 769
diff changeset
280 DEBUG_PRINT((DEBUG_NAME "freq %d: %lu Hz, clock %lu, prediv %d\n",
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
281 i, MINTAUDIO_frequencies[i].frequency, MINTAUDIO_frequencies[i].masterclock,
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
282 MINTAUDIO_frequencies[i].predivisor
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
283 ));
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
284 }
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
285 #endif
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
286
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
287 MINTAUDIO_numfreq=SDL_MintAudio_SearchFrequency(this, spec->freq);
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diff changeset
288 spec->freq=MINTAUDIO_frequencies[MINTAUDIO_numfreq].frequency;
644
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diff changeset
289
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diff changeset
290 DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ",spec->format & 0x00ff));
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diff changeset
291 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
704
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diff changeset
292 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
644
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diff changeset
293 DEBUG_PRINT(("channels=%d, ", spec->channels));
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parents:
diff changeset
294 DEBUG_PRINT(("freq=%d\n", spec->freq));
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parents:
diff changeset
295
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diff changeset
296 return 0;
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parents:
diff changeset
297 }
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parents:
diff changeset
298
594422ab8f9f Atari MiNT: added more audio drivers
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299 static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec)
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300 {
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301 int channels_mode, prediv;
644
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302 void *buffer;
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303
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304 /* Stop currently playing sound */
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305 Buffoper(0);
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306
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307 /* Set replay tracks */
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308 Settracks(0,0);
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309 Setmontracks(0);
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310
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311 /* Select replay format */
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312 switch (spec->format & 0xff) {
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313 case 8:
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314 if (spec->channels==2) {
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315 channels_mode=STEREO8;
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316 } else {
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317 channels_mode=MONO8;
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318 }
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319 break;
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320 case 16:
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321 if (spec->channels==2) {
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322 channels_mode=STEREO16;
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323 } else {
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324 channels_mode=MONO16;
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325 }
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326 break;
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327 default:
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328 channels_mode=STEREO16;
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329 break;
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330 }
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331 if (Setmode(channels_mode)<0) {
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332 DEBUG_PRINT((DEBUG_NAME "Setmode() failed\n"));
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333 }
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334
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335 prediv = MINTAUDIO_frequencies[MINTAUDIO_numfreq].predivisor;
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336 Devconnect(DMAPLAY, DAC, CLKEXT, prediv, 1);
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337
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338 /* Set buffer */
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339 buffer = SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];
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340 if (Setbuffer(0, buffer, buffer + spec->size)<0) {
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341 DEBUG_PRINT((DEBUG_NAME "Setbuffer() failed\n"));
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342 }
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343
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344 /* Install interrupt */
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345 if (NSetinterrupt(2, SI_PLAY, SDL_MintAudio_GsxbInterrupt)<0) {
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346 DEBUG_PRINT((DEBUG_NAME "NSetinterrupt() failed\n"));
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347 }
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348
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349 /* Go */
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350 Buffoper(SB_PLA_ENA|SB_PLA_RPT);
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351 DEBUG_PRINT((DEBUG_NAME "hardware initialized\n"));
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352 }
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353
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354 static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec)
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355 {
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356 /* Lock sound system */
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357 if (Locksnd()!=1) {
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358 SDL_SetError("Mint_OpenAudio: Audio system already in use");
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359 return(-1);
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360 }
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361
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362 SDL_MintAudio_device = this;
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363
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364 /* Check audio capabilities */
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365 if (Mint_CheckAudio(this, spec)==-1) {
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366 return -1;
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367 }
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368
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369 SDL_CalculateAudioSpec(spec);
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370
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371 /* Allocate memory for audio buffers in DMA-able RAM */
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372 DEBUG_PRINT((DEBUG_NAME "buffer size=%d\n", spec->size));
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373
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374 SDL_MintAudio_audiobuf[0] = Atari_SysMalloc(spec->size *2, MX_STRAM);
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375 if (SDL_MintAudio_audiobuf[0]==NULL) {
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376 SDL_SetError("MINT_OpenAudio: Not enough memory for audio buffer");
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377 return (-1);
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378 }
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379 SDL_MintAudio_audiobuf[1] = SDL_MintAudio_audiobuf[0] + spec->size ;
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380 SDL_MintAudio_numbuf=0;
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381 memset(SDL_MintAudio_audiobuf[0], spec->silence, spec->size *2);
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382 SDL_MintAudio_audiosize = spec->size;
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383 SDL_MintAudio_mutex = 0;
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384
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385 DEBUG_PRINT((DEBUG_NAME "buffer 0 at 0x%08x\n", SDL_MintAudio_audiobuf[0]));
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386 DEBUG_PRINT((DEBUG_NAME "buffer 1 at 0x%08x\n", SDL_MintAudio_audiobuf[1]));
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387
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388 /* Setup audio hardware */
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389 Mint_InitAudio(this, spec);
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390
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391 return(1); /* We don't use threaded audio */
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392 }