annotate src/audio/nto/SDL_nto_audio.c @ 252:e8157fcb3114

Updated the source with the correct e-mail address
author Sam Lantinga <slouken@libsdl.org>
date Fri, 14 Dec 2001 12:38:15 +0000
parents 74212992fb08
children 3d8b6b9f1e18
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, 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
252
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20 slouken@libsdl.org
0
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21 */
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22
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23
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24
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25 /* Allow access to a raw mixing buffer */
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26
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27 #include <stdlib.h>
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28 #include <stdio.h>
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29 #include <string.h>
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30 #include <errno.h>
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31 #include <unistd.h>
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32 #include <fcntl.h>
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33 #include <signal.h>
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34 #include <sys/types.h>
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35 #include <sys/time.h>
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36 #include <sched.h>
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37 #include <sys/asoundlib.h>
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38
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39 #include "SDL_audio.h"
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40 #include "SDL_error.h"
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41 #include "SDL_audiomem.h"
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42 #include "SDL_audio_c.h"
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43 #include "SDL_timer.h"
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44 #include "SDL_nto_audio.h"
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45
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46 /* The tag name used by NTO audio */
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47 #define DRIVER_NAME "nto"
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48
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49 /* default card and device numbers as listed in dev/snd */
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50 static int card_no = 0;
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51 static int device_no = 0;
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52
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53 /* default channel communication parameters */
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54 #define DEFAULT_CPARAMS_RATE 22050
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55 #define DEFAULT_CPARAMS_VOICES 1
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56 #define DEFAULT_CPARAMS_FRAG_SIZE 4096 //was 512
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57 #define DEFAULT_CPARAMS_FRAGS_MIN 1
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58 #define DEFAULT_CPARAMS_FRAGS_MAX -1
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59
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60 /* Open the audio device for playback, and don't block if busy */
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61 #define OPEN_FLAGS SND_PCM_OPEN_PLAYBACK
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62
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63 /* Audio driver functions */
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64 static int NTO_OpenAudio(_THIS, SDL_AudioSpec *spec);
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65 static void NTO_WaitAudio(_THIS);
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66 static void NTO_PlayAudio(_THIS);
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67 static Uint8 *NTO_GetAudioBuf(_THIS);
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68 static void NTO_CloseAudio(_THIS);
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69
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70 static snd_pcm_channel_status_t cstatus;
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71 static snd_pcm_channel_params_t cparams;
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72 static snd_pcm_channel_setup_t csetup;
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73
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74 /* PCM transfer channel parameters initialize function */
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75 static void init_pcm_cparams(snd_pcm_channel_params_t* cparams)
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76 {
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77 memset(cparams,0,sizeof(snd_pcm_channel_params_t));
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78
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79 cparams->channel = SND_PCM_CHANNEL_PLAYBACK;
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80 cparams->mode = SND_PCM_MODE_BLOCK;
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81 cparams->start_mode = SND_PCM_START_DATA; //_FULL
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82 cparams->stop_mode = SND_PCM_STOP_STOP;
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83 cparams->format.format = SND_PCM_SFMT_S16_LE;
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84 cparams->format.interleave = 1;
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85 cparams->format.rate = DEFAULT_CPARAMS_RATE;
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86 cparams->format.voices = DEFAULT_CPARAMS_VOICES;
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87 cparams->buf.block.frag_size = DEFAULT_CPARAMS_FRAG_SIZE;
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88 cparams->buf.block.frags_min = DEFAULT_CPARAMS_FRAGS_MIN;
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89 cparams->buf.block.frags_max = DEFAULT_CPARAMS_FRAGS_MAX;
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90 }
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91
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92 /* Audio driver bootstrap functions */
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93
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94 static int Audio_Available(void)
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95 /*
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96 See if we can open a nonblocking channel.
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97 Return value '1' means we can.
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98 Return value '0' means we cannot.
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99 */
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100 {
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101 int available;
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102 int rval;
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103 snd_pcm_t *handle;
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104
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105 available = 0;
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106 handle = NULL;
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107
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108 //JB modified to take advantage of software mixer
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109 rval = snd_pcm_open_preferred(&handle, &card_no, &device_no, OPEN_FLAGS);
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110
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111 if (rval >= 0)
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112 {
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113 available = 1;
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114
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115 if ((rval = snd_pcm_close(handle)) < 0)
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116 {
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117 SDL_SetError("snd_pcm_close failed: %s\n",snd_strerror(rval));
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118 available = 0;
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119 }
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120 }
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121 else
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122 {
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123
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124 SDL_SetError("snd_pcm_open failed: %s\n", snd_strerror(rval));
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125 }
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126
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127 #ifdef DEBUG_AUDIO
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128 fprintf(stderr,"AudioAvailable rtns %d\n", available);
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129 #endif
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130 return(available);
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131 }
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132
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133 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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134 {
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135 #ifdef DEBUG_AUDIO
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136 fprintf(stderr,"Audio_DeleteDevice\n");
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137 #endif
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138
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139
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140 free(device->hidden);
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141 free(device);
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142 }
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143
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144 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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145 {
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146 SDL_AudioDevice *this;
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147 #ifdef DEBUG_AUDIO
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148 fprintf(stderr,"Audio_CreateDevice\n");
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149 #endif
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150 /* Initialize all variables that we clean on shutdown */
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151 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice));
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152 if ( this ) {
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153 memset(this, 0, (sizeof *this));
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154 this->hidden = (struct SDL_PrivateAudioData *)
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155 malloc((sizeof *this->hidden));
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156 }
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157 if ( (this == NULL) || (this->hidden == NULL) ) {
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158 SDL_OutOfMemory();
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159 if ( this ) {
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160 free(this);
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161 }
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162 return(0);
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163 }
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164 memset(this->hidden, 0, (sizeof *this->hidden));
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165 audio_handle = NULL;
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166
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167 /* Set the function pointers */
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168 this->OpenAudio = NTO_OpenAudio;
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169 this->WaitAudio = NTO_WaitAudio;
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170 this->PlayAudio = NTO_PlayAudio;
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diff changeset
171 this->GetAudioBuf = NTO_GetAudioBuf;
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172 this->CloseAudio = NTO_CloseAudio;
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parents:
diff changeset
173
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174 this->free = Audio_DeleteDevice;
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parents:
diff changeset
175
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176 return this;
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parents:
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177 }
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parents:
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178
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parents:
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179 /* Don't change the name from "ALSA_bootstrap" - that's how it's called */
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180 AudioBootStrap ALSA_bootstrap = {
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181 DRIVER_NAME, "Neutrino PCM audio",
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182 Audio_Available, Audio_CreateDevice
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183 };
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184
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185 /* This function waits until it is possible to write a full sound buffer */
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186 static void NTO_WaitAudio(_THIS)
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187 {
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188 int rval;
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189 int totalbytes,roomavail;
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190 /*we consider a full sound buffer to be of size pcm_len bytes */
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191
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192 #ifdef DEBUG_AUDIO
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193 fprintf(stderr,"NTO_WaitAudio\n");
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194 #endif
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195
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parents:
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196 while(1)
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diff changeset
197 {
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198 memset(&cstatus, 0, sizeof(cstatus));
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199 if( (rval = snd_pcm_plugin_status(audio_handle, &cstatus)) < 0 )
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200 {
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201 SDL_SetError("snd_pcm_plugin_status failed: %s\n", snd_strerror(rval));
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202 return;
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diff changeset
203 }
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204
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205 totalbytes = csetup.buf.block.frag_size *csetup.buf.block.frags;
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206 roomavail = totalbytes - cstatus.count;
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207
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208 #ifdef DEBUG_AUDIO
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209 fprintf(stderr,"NTO_WaitAudio roomavail %d pcm_len %d\n",roomavail,pcm_len);
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210 #endif
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diff changeset
211
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diff changeset
212 if ((roomavail >= pcm_len) || (roomavail < 0))
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213 return;
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diff changeset
214
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215 SDL_Delay(10);
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parents:
diff changeset
216 }
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parents:
diff changeset
217
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parents:
diff changeset
218 }
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parents:
diff changeset
219
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parents:
diff changeset
220
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diff changeset
221
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diff changeset
222 static void NTO_PlayAudio(_THIS)
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diff changeset
223 {
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diff changeset
224 int written, rval;
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diff changeset
225 int towrite;
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diff changeset
226
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diff changeset
227 #ifdef DEBUG_AUDIO
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228 fprintf(stderr, "NTO_PlayAudio\n");
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diff changeset
229 #endif
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diff changeset
230
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parents:
diff changeset
231 if( !this->enabled)
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diff changeset
232 return;
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diff changeset
233
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diff changeset
234 towrite = pcm_len;
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diff changeset
235
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diff changeset
236
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diff changeset
237 /* Write the audio data, checking for EAGAIN (buffer full) and underrun */
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diff changeset
238 do {
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diff changeset
239 written = snd_pcm_plugin_write(audio_handle, pcm_buf, towrite);
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diff changeset
240 #ifdef DEBUG_AUDIO
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diff changeset
241 fprintf(stderr, "NTO_PlayAudio: written = %d towrite = %d\n",written,towrite);
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diff changeset
242 #endif
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parents:
diff changeset
243 if (written != towrite)
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parents:
diff changeset
244 {
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parents:
diff changeset
245 if ((errno == EAGAIN) || (errno == EWOULDBLOCK))
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
246 {
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diff changeset
247 SDL_Delay(1); /* Let a little CPU time go by and try to write again */
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parents:
diff changeset
248 #ifdef DEBUG_AUDIO
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diff changeset
249 fprintf(stderr, "errno == EAGAIN written %d\n", written);
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parents:
diff changeset
250 towrite -= written; //we wrote some data
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parents:
diff changeset
251 #endif
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parents:
diff changeset
252 continue;
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parents:
diff changeset
253 }
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parents:
diff changeset
254 else if((errno == EINVAL) || (errno == EIO))
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
255 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
256 #ifdef DEBUG_AUDIO
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parents:
diff changeset
257 if(errno == EIO)
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parents:
diff changeset
258 fprintf(stderr,"snd_pcm_plugin_write failed EIO: %s\n", snd_strerror(written));
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parents:
diff changeset
259 if(errno == EINVAL)
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parents:
diff changeset
260 fprintf(stderr,"snd_pcm_plugin_write failed EINVAL: %s\n", snd_strerror(written));
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parents:
diff changeset
261
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
262 #endif
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parents:
diff changeset
263
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parents:
diff changeset
264 memset(&cstatus, 0, sizeof(cstatus));
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parents:
diff changeset
265 if( (rval = snd_pcm_plugin_status(audio_handle, &cstatus)) < 0 )
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
266 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
267 #ifdef DEBUG_AUDIO
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
268 fprintf(stderr, "snd_pcm_plugin_status failed %s\n",snd_strerror(rval));
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
269 #endif
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
270 SDL_SetError("snd_pcm_plugin_status failed: %s\n", snd_strerror(rval));
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
271 return;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
272 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
273
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
274 if ( (cstatus.status == SND_PCM_STATUS_UNDERRUN) ||
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
275 (cstatus.status == SND_PCM_STATUS_READY) )
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
276 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
277 #ifdef DEBUG_AUDIO
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
278 fprintf(stderr, "buffer underrun\n");
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
279 #endif
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
280 if ( (rval = snd_pcm_plugin_prepare (audio_handle,SND_PCM_CHANNEL_PLAYBACK)) < 0 )
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
281 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
282 #ifdef DEBUG_AUDIO
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
283 fprintf(stderr, "NTO_PlayAudio: prepare failed %s\n",snd_strerror(rval));
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
284 #endif
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
285 SDL_SetError("snd_pcm_plugin_prepare failed: %s\n",snd_strerror(rval) );
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
286 return;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
287 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
288
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
289 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
290 continue;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
291 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
292 else
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
293 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
294 #ifdef DEBUG_AUDIO
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
295 fprintf(stderr, "NTO_PlayAudio: snd_pcm_plugin_write failed unknown errno %d %s\n",errno, snd_strerror(rval));
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
296 #endif
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
297 return;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
298
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
299 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
300
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
301 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
302 else
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
303 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
304 towrite -= written; //we wrote all remaining data
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
305 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
306 } while ( (towrite > 0) && (this->enabled) );
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
307
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
308 /* If we couldn't write, assume fatal error for now */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
309 if ( towrite != 0 ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
310 this->enabled = 0;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
311 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
312 return;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
313 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
314
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
315 static Uint8 *NTO_GetAudioBuf(_THIS)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
316 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
317 #ifdef DEBUG_AUDIO
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
318 fprintf(stderr, "NTO_GetAudioBuf: pcm_buf %X\n",(Uint8 *)pcm_buf);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
319 #endif
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
320 return(pcm_buf);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
321 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
322
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
323 static void NTO_CloseAudio(_THIS)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
324 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
325 int rval;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
326
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
327 #ifdef DEBUG_AUDIO
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
328 fprintf(stderr, "NTO_CloseAudio\n");
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
329 #endif
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
330
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
331 this->enabled = 0;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
332
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
333 if ( audio_handle != NULL ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
334 if ((rval = snd_pcm_plugin_flush(audio_handle,SND_PCM_CHANNEL_PLAYBACK)) < 0)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
335 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
336 SDL_SetError("snd_pcm_plugin_flush failed: %s\n",snd_strerror(rval));
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
337 return;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
338 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
339 if ((rval = snd_pcm_close(audio_handle)) < 0)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
340 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
341 SDL_SetError("snd_pcm_close failed: %s\n",snd_strerror(rval));
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
342 return;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
343 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
344 audio_handle = NULL;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
345 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
346 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
347
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
348 static int NTO_OpenAudio(_THIS, SDL_AudioSpec *spec)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
349 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
350 int rval;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
351 int format;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
352 Uint16 test_format;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
353 int twidth;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
354 int found;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
355
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
356 #ifdef DEBUG_AUDIO
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
357 fprintf(stderr, "NTO_OpenAudio\n");
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
358 #endif
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
359
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
360 audio_handle = NULL;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
361 this->enabled = 0;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
362
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
363 if ( pcm_buf != NULL ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
364 free((Uint8 *)pcm_buf);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
365 pcm_buf = NULL;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
366 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
367
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
368 /* initialize channel transfer parameters to default */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
369 init_pcm_cparams(&cparams);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
370
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
371 /* Open the audio device */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
372
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
373 rval = snd_pcm_open_preferred(&audio_handle, &card_no, &device_no, OPEN_FLAGS);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
374 if ( rval < 0 ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
375 SDL_SetError("snd_pcm_open failed: %s\n", snd_strerror(rval));
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
376 return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
377 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
378
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
379 /* set to nonblocking mode */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
380 if ((rval = snd_pcm_nonblock_mode(audio_handle, 1))<0) //I assume 1 means on
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
381 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
382 SDL_SetError("snd_pcm_nonblock_mode failed: %s\n", snd_strerror(rval));
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
383 return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
384 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
385
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
386 /* enable count status parameter */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
387 if ((rval = snd_plugin_set_disable(audio_handle, PLUGIN_DISABLE_MMAP))<0)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
388 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
389 SDL_SetError("snd_plugin_set_disable failed: %s\n", snd_strerror(rval));
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
390 return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
391 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
392
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
393
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
394 /* Try for a closest match on audio format */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
395 format = 0;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
396 found = 0; // can't use format as SND_PCM_SFMT_U8 = 0 in nto
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
397 for ( test_format = SDL_FirstAudioFormat(spec->format); !found ; )
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
398
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
399 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
400 #ifdef DEBUG_AUDIO
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
401 fprintf(stderr, "Trying format 0x%4.4x spec->samples %d\n", test_format,spec->samples);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
402 #endif
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
403 /* if match found set format to equivalent ALSA format */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
404 switch ( test_format ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
405 case AUDIO_U8:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
406 format = SND_PCM_SFMT_U8;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
407 cparams.buf.block.frag_size = spec->samples * spec->channels;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
408 found = 1;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
409 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
410 case AUDIO_S8:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
411 format = SND_PCM_SFMT_S8;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
412 cparams.buf.block.frag_size = spec->samples * spec->channels;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
413 found = 1;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
414 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
415 case AUDIO_S16LSB:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
416 format = SND_PCM_SFMT_S16_LE;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
417 cparams.buf.block.frag_size = spec->samples*2 * spec->channels;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
418 found = 1;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
419 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
420 case AUDIO_S16MSB:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
421 format = SND_PCM_SFMT_S16_BE;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
422 cparams.buf.block.frag_size = spec->samples*2 * spec->channels;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
423 found = 1;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
424 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
425 case AUDIO_U16LSB:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
426 format = SND_PCM_SFMT_U16_LE;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
427 cparams.buf.block.frag_size = spec->samples*2 * spec->channels;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
428 found = 1;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
429 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
430 case AUDIO_U16MSB:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
431 format = SND_PCM_SFMT_U16_BE;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
432 cparams.buf.block.frag_size = spec->samples*2 * spec->channels;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
433 found = 1;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
434 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
435 default:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
436 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
437 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
438 if ( ! found ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
439 test_format = SDL_NextAudioFormat();
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
440 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
441 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
442
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
443 /* assumes test_format not 0 on success */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
444 if ( test_format == 0 ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
445 SDL_SetError("Couldn't find any hardware audio formats");
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
446 return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
447 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
448
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
449 spec->format = test_format;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
450
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
451 /* Set the audio format */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
452 cparams.format.format = format;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
453
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
454 /* Set mono or stereo audio (currently only two channels supported) */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
455 cparams.format.voices = spec->channels;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
456
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
457 #ifdef DEBUG_AUDIO
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
458 fprintf(stderr,"intializing channels %d\n", cparams.format.voices);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
459 #endif
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
460
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
461
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
462 /* Set rate */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
463 cparams.format.rate = spec->freq ;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
464
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
465 /* Setup the transfer parameters according to cparams */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
466 rval = snd_pcm_plugin_params(audio_handle, &cparams);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
467 if (rval < 0) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
468 SDL_SetError("snd_pcm_channel_params failed: %s\n", snd_strerror (rval));
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
469 return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
470 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
471
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
472 /* Make sure channel is setup right one last time */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
473 memset( &csetup, 0, sizeof( csetup ) );
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
474 csetup.channel = SND_PCM_CHANNEL_PLAYBACK;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
475 if ( snd_pcm_plugin_setup( audio_handle, &csetup ) < 0 )
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
476 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
477 SDL_SetError("Unable to setup playback channel\n" );
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
478 return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
479 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
480 else
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
481 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
482 #ifdef DEBUG_AUDIO
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
483 fprintf(stderr,"requested format: %d\n",cparams.format.format);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
484 fprintf(stderr,"requested frag size: %d\n",cparams.buf.block.frag_size);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
485 fprintf(stderr,"requested max frags: %d\n\n",cparams.buf.block.frags_max);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
486
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
487 fprintf(stderr,"real format: %d\n", csetup.format.format );
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
488 fprintf(stderr,"real frag size : %d\n", csetup.buf.block.frag_size );
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
489 fprintf(stderr,"real max frags : %d\n", csetup.buf.block.frags_max );
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
490 #endif // DEBUG_AUDIO
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
491 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
492
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
493
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
494 /* Allocate memory to the audio buffer and initialize with silence
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
495 (Note that buffer size must be a multiple of fragment size, so find closest multiple)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
496 */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
497
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
498 twidth = snd_pcm_format_width(format);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
499 if (twidth < 0) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
500 printf("snd_pcm_format_width failed\n");
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
501 twidth = 0;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
502 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
503
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
504 #ifdef DEBUG_AUDIO
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
505 fprintf(stderr,"format is %d bits wide\n",twidth);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
506 #endif
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
507
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
508 pcm_len = spec->size ;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
509
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
510
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
511 #ifdef DEBUG_AUDIO
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
512 fprintf(stderr,"pcm_len set to %d\n", pcm_len);
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513 #endif
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514
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515 if (pcm_len == 0)
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516 {
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517 pcm_len = csetup.buf.block.frag_size;
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518 }
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519
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520 pcm_buf = (Uint8*)malloc(pcm_len);
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521 if (pcm_buf == NULL) {
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522 SDL_SetError("pcm_buf malloc failed\n");
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523 return(-1);
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524 }
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525 memset(pcm_buf,spec->silence,pcm_len);
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526
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527 #ifdef DEBUG_AUDIO
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528 fprintf(stderr,"pcm_buf malloced and silenced.\n");
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529 #endif
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530
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531 /* get the file descriptor */
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532 if( (audio_fd = snd_pcm_file_descriptor(audio_handle, SND_PCM_CHANNEL_PLAYBACK)) < 0)
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533 {
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534 fprintf(stderr, "snd_pcm_file_descriptor failed with error code: %d\n", audio_fd);
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535 }
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536
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537 /* Trigger audio playback */
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538 rval = snd_pcm_plugin_prepare( audio_handle, SND_PCM_CHANNEL_PLAYBACK);
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539 if (rval < 0) {
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540 SDL_SetError("snd_pcm_plugin_prepare failed: %s\n", snd_strerror (rval));
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541 return(-1);
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542 }
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543
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544 this->enabled = 1;
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545
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546 /* Get the parent process id (we're the parent of the audio thread) */
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547 parent = getpid();
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548
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diff changeset
549 /* We're ready to rock and roll. :-) */
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550 return(0);
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551 }
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552
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parents:
diff changeset
553
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554