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annotate src/audio/mint/SDL_mintaudio_gsxb.c @ 2938:2929ed239d2a

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Adjusted default choice of audio driver. If a driver can definitely see available devices, it is chosen. Otherwise, we'll take the first driver that initializes but saw no devices...this might be because it can't enumerate them, or there really aren't any available. This prevents the dsp driver from hogging control when there are no /dev/dsp* nodes (for example, on a Linux box with ALSA and no OSS emulation).
author Ryan C. Gordon <icculus@icculus.org>
date Thu, 01 Jan 2009 07:54:58 +0000
parents 99210400e8b9
children 1e431c2631ee
rev   line source
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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 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 #include "SDL_config.h"
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23
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24 /*
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25 MiNT audio driver
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26 using XBIOS functions (GSXB compatible driver)
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27
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28 Patrice Mandin
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29 */
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30
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31 /* Mint includes */
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32 #include <mint/osbind.h>
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33 #include <mint/falcon.h>
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34 #include <mint/cookie.h>
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35
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36 #include "SDL_audio.h"
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37 #include "../SDL_audio_c.h"
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38 #include "../SDL_sysaudio.h"
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39
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40 #include "../../video/ataricommon/SDL_atarimxalloc_c.h"
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41
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42 #include "SDL_mintaudio.h"
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43 #include "SDL_mintaudio_gsxb.h"
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44
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45 /*--- Defines ---*/
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46
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47 #define MINT_AUDIO_DRIVER_NAME "mint_gsxb"
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48
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49 /* Debug print info */
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50 #define DEBUG_NAME "audio:gsxb: "
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51 #if 0
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52 #define DEBUG_PRINT(what) \
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53 { \
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54 printf what; \
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55 }
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56 #else
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57 #define DEBUG_PRINT(what)
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58 #endif
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59
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60 /*--- Static variables ---*/
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61
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62 static unsigned long cookie_snd, cookie_gsxb;
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63
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64 /*--- Audio driver functions ---*/
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65
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66 /* GSXB callbacks */
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67 static void MINTGSXB_GsxbInterrupt(void);
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68 static void MINTGSXB_GsxbNullInterrupt(void);
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69
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70 static void
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71 MINTGSXB_LockDevice(_THIS)
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72 {
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73 /* Stop replay */
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74 Buffoper(0);
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75 }
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76
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77 static void
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78 MINTGSXB_UnlockDevice(_THIS)
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79 {
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80 /* Restart replay */
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81 Buffoper(SB_PLA_ENA | SB_PLA_RPT);
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82 }
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83
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84 static void
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85 MINTGSXB_CloseDevice(_THIS)
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86 {
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87 if (this->hidden != NULL) {
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88 /* Stop replay */
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89 Buffoper(0);
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90
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91 /* Uninstall interrupt */
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92 if (NSetinterrupt(2, SI_NONE, MINTGSXB_GsxbNullInterrupt) < 0) {
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93 DEBUG_PRINT((DEBUG_NAME "NSetinterrupt() failed in close\n"));
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94 }
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95
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96 /* Wait if currently playing sound */
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97 while (SDL_MintAudio_mutex != 0) {
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98 }
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100 /* Clear buffers */
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101 if (SDL_MintAudio_audiobuf[0]) {
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102 Mfree(SDL_MintAudio_audiobuf[0]);
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103 SDL_MintAudio_audiobuf[0] = SDL_MintAudio_audiobuf[1] = NULL;
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104 }
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105
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106 /* Unlock sound system */
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107 Unlocksnd();
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108
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109 SDL_free(this->hidden);
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110 this->hidden = NULL;
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111 }
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112 }
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113
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114 static int
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115 MINTGSXB_CheckAudio(_THIS)
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116 {
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117 long snd_format;
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118 int i, resolution, format_signed, format_bigendian;
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119 SDL_AudioFormat test_format = SDL_FirstAudioFormat(this->spec.format);
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120 int valid_datatype = 0;
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122 resolution = SDL_AUDIO_BITSIZE(this->spec.format);
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123 format_signed = SDL_AUDIO_ISSIGNED(this->spec.format);
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124 format_bigendian = SDL_AUDIO_ISBIGENDIAN(this->spec.format);
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125
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126 DEBUG_PRINT((DEBUG_NAME "asked: %d bits, ", resolution));
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127 DEBUG_PRINT(("float=%d, ", SDL_AUDIO_ISFLOAT(this->spec.format)));
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128 DEBUG_PRINT(("signed=%d, ", format_signed));
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129 DEBUG_PRINT(("big endian=%d, ", format_bigendian));
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130 DEBUG_PRINT(("channels=%d, ", this->spec.channels));
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131 DEBUG_PRINT(("freq=%d\n", this->spec.freq));
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133 if (this->spec.channels > 2) {
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134 this->spec.channels = 2; /* no more than stereo! */
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135 }
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136
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137 while ((!valid_datatype) && (test_format)) {
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138 /* Check formats available */
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139 snd_format = Sndstatus(SND_QUERYFORMATS);
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140 this->spec.format = test_format;
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141 resolution = SDL_AUDIO_BITSIZE(this->spec.format);
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142 format_signed = SDL_AUDIO_ISSIGNED(this->spec.format);
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143 format_bigendian = SDL_AUDIO_ISBIGENDIAN(this->spec.format);
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144 switch (test_format) {
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145 case AUDIO_U8:
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146 case AUDIO_S8:
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147 if (snd_format & SND_FORMAT8) {
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148 valid_datatype = 1;
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149 snd_format = Sndstatus(SND_QUERY8BIT);
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150 }
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151 break;
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152
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153 case AUDIO_U16LSB:
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154 case AUDIO_S16LSB:
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155 case AUDIO_U16MSB:
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156 case AUDIO_S16MSB:
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157 if (snd_format & SND_FORMAT16) {
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158 valid_datatype = 1;
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159 snd_format = Sndstatus(SND_QUERY16BIT);
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160 }
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161 break;
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162
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163 case AUDIO_S32LSB:
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164 case AUDIO_S32MSB:
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165 if (snd_format & SND_FORMAT32) {
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166 valid_datatype = 1;
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167 snd_format = Sndstatus(SND_QUERY32BIT);
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168 }
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169 break;
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170
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171 /* no float support... */
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172
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173 default:
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174 test_format = SDL_NextAudioFormat();
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175 break;
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176 }
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177 }
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178
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179 if (!valid_datatype) {
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180 SDL_SetError("Unsupported audio format");
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181 return (-1);
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182 }
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183
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184 /* Check signed/unsigned format */
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185 if (format_signed) {
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186 if (snd_format & SND_FORMATSIGNED) {
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187 /* Ok */
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188 } else if (snd_format & SND_FORMATUNSIGNED) {
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189 /* Give unsigned format */
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190 this->spec.format = this->spec.format & (~SDL_AUDIO_MASK_SIGNED);
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191 }
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192 } else {
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193 if (snd_format & SND_FORMATUNSIGNED) {
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194 /* Ok */
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195 } else if (snd_format & SND_FORMATSIGNED) {
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196 /* Give signed format */
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197 this->spec.format |= SDL_AUDIO_MASK_SIGNED;
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198 }
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199 }
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200
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201 if (format_bigendian) {
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202 if (snd_format & SND_FORMATBIGENDIAN) {
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203 /* Ok */
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204 } else if (snd_format & SND_FORMATLITTLEENDIAN) {
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205 /* Give little endian format */
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206 this->spec.format = this->spec.format & (~SDL_AUDIO_MASK_ENDIAN);
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207 }
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208 } else {
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209 if (snd_format & SND_FORMATLITTLEENDIAN) {
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210 /* Ok */
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211 } else if (snd_format & SND_FORMATBIGENDIAN) {
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212 /* Give big endian format */
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213 this->spec.format |= SDL_AUDIO_MASK_ENDIAN;
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214 }
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215 }
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216
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217 /* Calculate and select the closest frequency */
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218 MINTAUDIO_freqcount = 0;
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219 for (i = 1; i < 4; i++) {
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220 SDL_MintAudio_AddFrequency(this,
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221 MASTERCLOCK_44K / (MASTERPREDIV_MILAN *
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222 (1 << i)),
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223 MASTERCLOCK_44K, (1 << i) - 1, -1);
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224 }
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225
961
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226 #if 1
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227 for (i = 0; i < MINTAUDIO_freqcount; i++) {
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228 DEBUG_PRINT((DEBUG_NAME "freq %d: %lu Hz, clock %lu, prediv %d\n",
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229 i, MINTAUDIO_frequencies[i].frequency,
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230 MINTAUDIO_frequencies[i].masterclock,
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231 MINTAUDIO_frequencies[i].predivisor));
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232 }
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233 #endif
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234
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235 MINTAUDIO_numfreq = SDL_MintAudio_SearchFrequency(this, this->spec.freq);
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236 this->spec.freq = MINTAUDIO_frequencies[MINTAUDIO_numfreq].frequency;
1895
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237
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diff changeset
238 DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ",
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239 SDL_AUDIO_BITSIZE(this->spec.format)));
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240 DEBUG_PRINT(("float=%d, ", SDL_AUDIO_ISFLOAT(this->spec.format)));
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241 DEBUG_PRINT(("signed=%d, ", SDL_AUDIO_ISSIGNED(this->spec.format)));
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242 DEBUG_PRINT(("big endian=%d, ",
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243 SDL_AUDIO_ISBIGENDIAN(this->spec.format)));
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244 DEBUG_PRINT(("channels=%d, ", this->spec.channels));
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245 DEBUG_PRINT(("freq=%d\n", this->spec.freq));
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246
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247 return 0;
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248 }
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249
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250 static void
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251 MINTGSXB_InitAudio(_THIS)
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252 {
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253 int channels_mode, prediv;
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254 void *buffer;
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255
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256 /* Stop currently playing sound */
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257 Buffoper(0);
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258
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259 /* Set replay tracks */
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260 Settracks(0, 0);
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261 Setmontracks(0);
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262
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263 /* Select replay format */
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diff changeset
264 switch (SDL_AUDIO_BITSIZE(this->spec.format)) {
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265 case 8:
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266 if (this->spec.channels == 2) {
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267 channels_mode = STEREO8;
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268 } else {
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269 channels_mode = MONO8;
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270 }
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271 break;
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diff changeset
272 case 16:
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273 if (this->spec.channels == 2) {
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274 channels_mode = STEREO16;
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275 } else {
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276 channels_mode = MONO16;
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277 }
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278 break;
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diff changeset
279 case 32:
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280 if (this->spec.channels == 2) {
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diff changeset
281 channels_mode = STEREO32;
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diff changeset
282 } else {
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diff changeset
283 channels_mode = MONO32;
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diff changeset
284 }
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diff changeset
285 break;
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286 default:
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287 channels_mode = STEREO16;
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288 break;
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289 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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290 if (Setmode(channels_mode) < 0) {
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291 DEBUG_PRINT((DEBUG_NAME "Setmode() failed\n"));
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292 }
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293
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294 prediv = MINTAUDIO_frequencies[MINTAUDIO_numfreq].predivisor;
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295 Devconnect(DMAPLAY, DAC, CLKEXT, prediv, 1);
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296
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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297 /* Set buffer */
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298 buffer = SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];
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299 if (Setbuffer(0, buffer, buffer + this->spec.size) < 0) {
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300 DEBUG_PRINT((DEBUG_NAME "Setbuffer() failed\n"));
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301 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
302
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
303 /* Install interrupt */
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diff changeset
304 if (NSetinterrupt(2, SI_PLAY, MINTGSXB_GsxbInterrupt) < 0) {
1895
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305 DEBUG_PRINT((DEBUG_NAME "NSetinterrupt() failed\n"));
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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306 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
307
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
308 /* Go */
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diff changeset
309 Buffoper(SB_PLA_ENA | SB_PLA_RPT);
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310 DEBUG_PRINT((DEBUG_NAME "hardware initialized\n"));
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311 }
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312
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313 static int
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diff changeset
314 MINTGSXB_OpenDevice(_THIS, const char *devname, int iscapture)
644
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315 {
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diff changeset
316 /* Lock sound system */
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317 if (Locksnd() != 1) {
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diff changeset
318 SDL_SetError("MINTGSXB_OpenDevice: Audio system already in use");
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319 return 0;
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320 }
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321
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322 SDL_MintAudio_device = this;
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323
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324 /* Check audio capabilities */
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325 if (MINTGSXB_CheckAudio(this) == -1) {
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326 return 0;
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327 }
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diff changeset
328
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329 /* Initialize all variables that we clean on shutdown */
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diff changeset
330 this->hidden = (struct SDL_PrivateAudioData *)
2060
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331 SDL_malloc((sizeof *this->hidden));
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332 if (this->hidden == NULL) {
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diff changeset
333 SDL_OutOfMemory();
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diff changeset
334 return 0;
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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diff changeset
335 }
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diff changeset
336 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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diff changeset
337
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diff changeset
338 SDL_CalculateAudioSpec(&this->spec);
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339
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340 /* Allocate memory for audio buffers in DMA-able RAM */
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341 DEBUG_PRINT((DEBUG_NAME "buffer size=%d\n", this->spec.size));
644
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diff changeset
342
2060
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343 SDL_MintAudio_audiobuf[0] =
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344 Atari_SysMalloc(this->spec.size * 2, MX_STRAM);
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345 if (SDL_MintAudio_audiobuf[0] == NULL) {
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346 SDL_free(this->hidden);
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diff changeset
347 this->hidden = NULL;
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diff changeset
348 SDL_OutOfMemory();
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diff changeset
349 return 0;
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350 }
2049
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351 SDL_MintAudio_audiobuf[1] = SDL_MintAudio_audiobuf[0] + this->spec.size;
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352 SDL_MintAudio_numbuf = 0;
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353 SDL_memset(SDL_MintAudio_audiobuf[0], this->spec.silence,
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diff changeset
354 this->spec.size * 2);
2049
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355 SDL_MintAudio_audiosize = this->spec.size;
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356 SDL_MintAudio_mutex = 0;
644
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357
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358 DEBUG_PRINT((DEBUG_NAME "buffer 0 at 0x%08x\n",
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
359 SDL_MintAudio_audiobuf[0]));
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360 DEBUG_PRINT((DEBUG_NAME "buffer 1 at 0x%08x\n",
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diff changeset
361 SDL_MintAudio_audiobuf[1]));
644
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362
2027
d48ead2d2ba5 Save/restore FPU registers in interrupt
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diff changeset
363 SDL_MintAudio_CheckFpu();
d48ead2d2ba5 Save/restore FPU registers in interrupt
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diff changeset
364
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diff changeset
365 /* Setup audio hardware */
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366 MINTGSXB_InitAudio(this);
644
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diff changeset
367
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368 return 1; /* good to go. */
644
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369 }
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370
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371 static void
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diff changeset
372 MINTGSXB_GsxbInterrupt(void)
644
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373 {
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diff changeset
374 Uint8 *newbuf;
644
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375
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376 if (SDL_MintAudio_mutex)
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377 return;
644
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378
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diff changeset
379 SDL_MintAudio_mutex = 1;
644
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diff changeset
380
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381 SDL_MintAudio_numbuf ^= 1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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382 SDL_MintAudio_Callback();
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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383 newbuf = SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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384 Setbuffer(0, newbuf, newbuf + SDL_MintAudio_audiosize);
644
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diff changeset
385
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386 SDL_MintAudio_mutex = 0;
644
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diff changeset
387 }
1097
c83fa1c650dd Move GSXB callback to C source
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388
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c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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389 static void
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390 MINTGSXB_GsxbNullInterrupt(void)
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391 {
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392 }
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393
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394 static int
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395 MINTGSXB_Init(SDL_AudioDriverImpl * impl)
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396 {
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397 /* Cookie _SND present ? if not, assume ST machine */
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398 if (Getcookie(C__SND, &cookie_snd) == C_NOTFOUND) {
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399 cookie_snd = SND_PSG;
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400 }
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401
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402 /* Check if we have 16 bits audio */
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403 if ((cookie_snd & SND_16BIT) == 0) {
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404 SDL_SetError(DEBUG_NAME "no 16-bit sound");
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405 return 0;
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406 }
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407
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408 /* Cookie GSXB present ? */
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409 cookie_gsxb = (Getcookie(C_GSXB, &cookie_gsxb) == C_FOUND);
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410
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411 /* Is it GSXB ? */
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412 if (((cookie_snd & SND_GSXB) == 0) || (cookie_gsxb == 0)) {
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413 SDL_SetError(DEBUG_NAME "no GSXB audio");
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414 return 0;
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415 }
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416
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417 /* Check if audio is lockable */
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418 if (Locksnd() != 1) {
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419 SDL_SetError(DEBUG_NAME "audio locked by other application");
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420 return 0;
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421 }
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422
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423 Unlocksnd();
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424
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425 DEBUG_PRINT((DEBUG_NAME "GSXB audio available!\n"));
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426
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427 /* Set the function pointers */
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428 impl->OpenDevice = MINTGSXB_OpenDevice;
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429 impl->CloseDevice = MINTGSXB_CloseDevice;
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430 impl->LockDevice = MINTGSXB_LockDevice;
29e07f91bc1f Rename LockAudio,UnlockAudio to LockDevice,UnlockDevice. Also some small fixes
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431 impl->UnlockDevice = MINTGSXB_UnlockDevice;
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432 impl->OnlyHasDefaultOutputDevice = 1;
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433 impl->ProvidesOwnCallbackThread = 1;
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434 impl->SkipMixerLock = 1;
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435
2938
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436 return 2; /* 2 == definitely has an audio device. */
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437 }
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438
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439 AudioBootStrap MINTAUDIO_GSXB_bootstrap = {
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440 MINT_AUDIO_DRIVER_NAME, "MiNT GSXB audio driver", MINTGSXB_Init, 0
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441 };
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442
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443 /* vi: set ts=4 sw=4 expandtab: */