annotate src/audio/nto/SDL_nto_audio.c @ 673:63419da96d13

*** empty log message ***
author Sam Lantinga <slouken@libsdl.org>
date Fri, 08 Aug 2003 21:39:12 +0000
parents 8bedd6d61642
children cbc0f7fabd1c
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, 2002 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Library General Public License for more details.
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14
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15 You should have received a copy of the GNU Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22
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23 #include <stdlib.h>
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24 #include <stdio.h>
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25 #include <string.h>
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26 #include <errno.h>
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27 #include <unistd.h>
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28 #include <fcntl.h>
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29 #include <signal.h>
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30 #include <sys/types.h>
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31 #include <sys/time.h>
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32 #include <sched.h>
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33 #include <sys/asoundlib.h>
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34 #include <sys/select.h>
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35
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36 #include "SDL_audio.h"
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37 #include "SDL_error.h"
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38 #include "SDL_audiomem.h"
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39 #include "SDL_audio_c.h"
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40 #include "SDL_timer.h"
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41 #include "SDL_nto_audio.h"
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42
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43 /* The tag name used by NTO audio */
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44 #define DRIVER_NAME "nto"
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45
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46 /* default channel communication parameters */
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47 #define DEFAULT_CPARAMS_RATE 22050
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48 #define DEFAULT_CPARAMS_VOICES 1
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49 #define DEFAULT_CPARAMS_FRAG_SIZE 4096
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50 #define DEFAULT_CPARAMS_FRAGS_MIN 1
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51 #define DEFAULT_CPARAMS_FRAGS_MAX 1
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52
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53 /* Open the audio device for playback, and don't block if busy */
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54 #define OPEN_FLAGS SND_PCM_OPEN_PLAYBACK
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55
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56 /* Audio driver functions */
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57 static int NTO_OpenAudio(_THIS, SDL_AudioSpec *spec);
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58 static void NTO_WaitAudio(_THIS);
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59 static void NTO_PlayAudio(_THIS);
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60 static Uint8 *NTO_GetAudioBuf(_THIS);
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61 static void NTO_CloseAudio(_THIS);
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62
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63 static snd_pcm_channel_status_t cstatus;
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64 static snd_pcm_channel_params_t cparams;
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65 static snd_pcm_channel_setup_t csetup;
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66
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67 /* PCM transfer channel parameters initialize function */
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68 static void init_pcm_cparams(snd_pcm_channel_params_t* cparams)
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69 {
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70 memset(cparams,0,sizeof(snd_pcm_channel_params_t));
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71
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72 cparams->channel = SND_PCM_CHANNEL_PLAYBACK;
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73 cparams->mode = SND_PCM_MODE_BLOCK;
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74 cparams->start_mode = SND_PCM_START_DATA;
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75 cparams->stop_mode = SND_PCM_STOP_STOP;
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76 cparams->format.format = SND_PCM_SFMT_S16_LE;
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77 cparams->format.interleave = 1;
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78 cparams->format.rate = DEFAULT_CPARAMS_RATE;
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79 cparams->format.voices = DEFAULT_CPARAMS_VOICES;
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80 cparams->buf.block.frag_size = DEFAULT_CPARAMS_FRAG_SIZE;
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81 cparams->buf.block.frags_min = DEFAULT_CPARAMS_FRAGS_MIN;
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82 cparams->buf.block.frags_max = DEFAULT_CPARAMS_FRAGS_MAX;
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83 }
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84
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85 static int Audio_Available(void)
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86 {
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87 /*
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88 See if we can open a nonblocking channel.
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89 Return value '1' means we can.
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90 Return value '0' means we cannot.
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91 */
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92
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93 int available;
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94 int rval;
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95 snd_pcm_t *handle;
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96
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97 available = 0;
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98 handle = NULL;
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99
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100 rval = snd_pcm_open_preferred(&handle, NULL, NULL, OPEN_FLAGS);
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101
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102 if (rval >= 0){
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103 available = 1;
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104
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105 if ((rval = snd_pcm_close(handle)) < 0){
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106 SDL_SetError("snd_pcm_close failed: %s\n",snd_strerror(rval));
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107 available = 0;
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108 }
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109 }
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110 else{
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111 SDL_SetError("snd_pcm_open failed: %s\n", snd_strerror(rval));
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112 }
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113
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114 #ifdef DEBUG_AUDIO
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115 fprintf(stderr,"AudioAvailable rtns %d\n", available);
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116 #endif
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117
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118 return(available);
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119 }
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120
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121 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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122 {
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123 #ifdef DEBUG_AUDIO
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124 fprintf(stderr,"Audio_DeleteDevice\n");
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125 #endif
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126
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127 free(device->hidden);
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128 free(device);
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129 }
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130
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131 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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132 {
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133 SDL_AudioDevice *this;
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134 #ifdef DEBUG_AUDIO
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135 fprintf(stderr,"Audio_CreateDevice\n");
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136 #endif
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137 /* Initialize all variables that we clean on shutdown */
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138 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice));
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139 if ( this ) {
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140 memset(this, 0, (sizeof *this));
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141 this->hidden = (struct SDL_PrivateAudioData *)
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142 malloc((sizeof *this->hidden));
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143 }
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144 if ( (this == NULL) || (this->hidden == NULL) ) {
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145 SDL_OutOfMemory();
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146 if ( this ) {
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147 free(this);
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148 }
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149 return(0);
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150 }
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151 memset(this->hidden, 0, (sizeof *this->hidden));
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152 audio_handle = NULL;
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153
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154 /* Set the function pointers */
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155 this->OpenAudio = NTO_OpenAudio;
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156 this->WaitAudio = NTO_WaitAudio;
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157 this->PlayAudio = NTO_PlayAudio;
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158 this->GetAudioBuf = NTO_GetAudioBuf;
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159 this->CloseAudio = NTO_CloseAudio;
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160
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161 this->free = Audio_DeleteDevice;
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162
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163 return this;
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164 }
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165
663
8bedd6d61642 Date: Sat, 2 Aug 2003 16:22:51 +0300
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166 AudioBootStrap QNXNTOAUDIO_bootstrap = {
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167 DRIVER_NAME, "QNX6 NTO PCM audio",
0
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168 Audio_Available, Audio_CreateDevice
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169 };
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170
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171 /* This function waits until it is possible to write a full sound buffer */
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172 static void NTO_WaitAudio(_THIS)
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173 {
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174 fd_set wfds;
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175
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176 FD_SET( audio_fd, &wfds );
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177 switch( select( audio_fd + 1, NULL, &wfds, NULL, NULL ) )
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178 {
418
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179 case -1:
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180 case 0:
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181 /* Error */
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182 SDL_SetError("select() in NTO_WaitAudio failed: %s\n", strerror(errno));
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183 break;
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184 default:
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185 if(FD_ISSET(audio_fd, &wfds))
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186 return;
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187 }
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188 }
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189
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190 static void NTO_PlayAudio(_THIS)
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191 {
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192 int written, rval;
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193 int towrite;
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194
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195 #ifdef DEBUG_AUDIO
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196 fprintf(stderr, "NTO_PlayAudio\n");
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197 #endif
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198
418
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199 if( !this->enabled){
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200 return;
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201 }
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202
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203 towrite = pcm_len;
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204
418
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205 /* Write the audio data, checking for EAGAIN (buffer full) and underrun */
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206 do {
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207 written = snd_pcm_plugin_write(audio_handle, pcm_buf, towrite);
418
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208 #ifdef DEBUG_AUDIO
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209 fprintf(stderr, "NTO_PlayAudio: written = %d towrite = %d\n",written,towrite);
418
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210 #endif
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211 if (written != towrite){
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212 if ((errno == EAGAIN) || (errno == EWOULDBLOCK)){
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213 SDL_Delay(1); /* Let a little CPU time go by and try to write again */
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214 #ifdef DEBUG_AUDIO
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215 fprintf(stderr, "errno == EAGAIN written %d\n", written);
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216 #endif
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217 towrite -= written; //we wrote some data
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218 continue;
418
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219 }
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220 else if((errno == EINVAL) || (errno == EIO)){
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221 if(errno == EIO){
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222 #ifdef DEBUG_AUDIO
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223 fprintf(stderr,"snd_pcm_plugin_write failed EIO: %s\n", snd_strerror(written));
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224 #endif
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225 }
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226 if(errno == EINVAL){
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227 #ifdef DEBUG_AUDIO
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228 fprintf(stderr,"snd_pcm_plugin_write failed EINVAL: %s\n", snd_strerror(written));
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229 #endif
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230 }
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231
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232 memset(&cstatus, 0, sizeof(cstatus));
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233 if( (rval = snd_pcm_plugin_status(audio_handle, &cstatus)) < 0 ){
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234 #ifdef DEBUG_AUDIO
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235 fprintf(stderr, "snd_pcm_plugin_status failed %s\n",snd_strerror(rval));
418
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236 #endif
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237 SDL_SetError("snd_pcm_plugin_status failed: %s\n", snd_strerror(rval));
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238 return;
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239 }
0
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240
418
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241 if ( (cstatus.status == SND_PCM_STATUS_UNDERRUN) || (cstatus.status == SND_PCM_STATUS_READY) ){
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242 #ifdef DEBUG_AUDIO
0
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243 fprintf(stderr, "buffer underrun\n");
418
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244 #endif
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245 if ( (rval = snd_pcm_plugin_prepare (audio_handle,SND_PCM_CHANNEL_PLAYBACK)) < 0 ){
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246 #ifdef DEBUG_AUDIO
0
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247 fprintf(stderr, "NTO_PlayAudio: prepare failed %s\n",snd_strerror(rval));
418
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248 #endif
0
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249 SDL_SetError("snd_pcm_plugin_prepare failed: %s\n",snd_strerror(rval) );
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250 return;
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251 }
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252 }
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253 continue;
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254 }
418
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255 else{
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256 #ifdef DEBUG_AUDIO
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257 fprintf(stderr, "NTO_PlayAudio: snd_pcm_plugin_write failed unknown errno %d %s\n",errno, snd_strerror(rval));
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258 #endif
0
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259 return;
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260 }
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261
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262 }
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263 else
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264 {
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265 towrite -= written; //we wrote all remaining data
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266 }
418
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267 } while ( (towrite > 0) && (this->enabled) );
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268
418
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269 /* If we couldn't write, assume fatal error for now */
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270 if ( towrite != 0 ) {
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271 this->enabled = 0;
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272 }
0
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273 return;
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274 }
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275
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276 static Uint8 *NTO_GetAudioBuf(_THIS)
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277 {
418
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diff changeset
278 #ifdef DEBUG_AUDIO
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279 fprintf(stderr, "NTO_GetAudioBuf: pcm_buf %X\n",(Uint8 *)pcm_buf);
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280 #endif
0
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281 return(pcm_buf);
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282 }
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283
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284 static void NTO_CloseAudio(_THIS)
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285 {
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286 int rval;
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287
418
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diff changeset
288 #ifdef DEBUG_AUDIO
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diff changeset
289 fprintf(stderr, "NTO_CloseAudio\n");
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diff changeset
290 #endif
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diff changeset
291
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diff changeset
292 this->enabled = 0;
0
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293
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294 if ( audio_handle != NULL ) {
418
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diff changeset
295 if ((rval = snd_pcm_plugin_flush(audio_handle,SND_PCM_CHANNEL_PLAYBACK)) < 0){
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296 SDL_SetError("snd_pcm_plugin_flush failed: %s\n",snd_strerror(rval));
0
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297 return;
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298 }
418
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299 if ((rval = snd_pcm_close(audio_handle)) < 0){
0
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300 SDL_SetError("snd_pcm_close failed: %s\n",snd_strerror(rval));
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301 return;
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302 }
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303 audio_handle = NULL;
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304 }
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305 }
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306
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307 static int NTO_OpenAudio(_THIS, SDL_AudioSpec *spec)
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308 {
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309 int rval;
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310 int format;
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311 Uint16 test_format;
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312 int twidth;
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313 int found;
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314
418
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315 #ifdef DEBUG_AUDIO
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316 fprintf(stderr, "NTO_OpenAudio\n");
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317 #endif
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318
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319 audio_handle = NULL;
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320 this->enabled = 0;
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321
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322 if ( pcm_buf != NULL ) {
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323 free((Uint8 *)pcm_buf);
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324 pcm_buf = NULL;
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325 }
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326
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327 /* initialize channel transfer parameters to default */
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328 init_pcm_cparams(&cparams);
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329
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330 /* Open the audio device */
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331 rval = snd_pcm_open_preferred(&audio_handle, NULL, NULL, OPEN_FLAGS);
0
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332 if ( rval < 0 ) {
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333 SDL_SetError("snd_pcm_open failed: %s\n", snd_strerror(rval));
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334 return(-1);
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335 }
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336
418
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337 /* enable count status parameter */
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338 if ((rval = snd_pcm_plugin_set_disable(audio_handle, PLUGIN_DISABLE_MMAP))<0){
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339 SDL_SetError("snd_pcm_plugin_set_disable failed: %s\n", snd_strerror(rval));
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340 return(-1);
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341 }
0
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342
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343 /* Try for a closest match on audio format */
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344 format = 0;
418
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345 found = 0; /* can't use format as SND_PCM_SFMT_U8 = 0 in nto */
0
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346 for ( test_format = SDL_FirstAudioFormat(spec->format); !found ; )
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347 {
418
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348 #ifdef DEBUG_AUDIO
0
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349 fprintf(stderr, "Trying format 0x%4.4x spec->samples %d\n", test_format,spec->samples);
418
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diff changeset
350 #endif
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351
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352 /* if match found set format to equivalent ALSA format */
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353 switch ( test_format ) {
0
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354 case AUDIO_U8:
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355 format = SND_PCM_SFMT_U8;
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356 found = 1;
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357 break;
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358 case AUDIO_S8:
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359 format = SND_PCM_SFMT_S8;
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360 found = 1;
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361 break;
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362 case AUDIO_S16LSB:
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363 format = SND_PCM_SFMT_S16_LE;
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364 found = 1;
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365 break;
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366 case AUDIO_S16MSB:
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367 format = SND_PCM_SFMT_S16_BE;
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368 found = 1;
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369 break;
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370 case AUDIO_U16LSB:
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371 format = SND_PCM_SFMT_U16_LE;
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372 found = 1;
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parents:
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373 break;
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374 case AUDIO_U16MSB:
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375 format = SND_PCM_SFMT_U16_BE;
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376 found = 1;
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parents:
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377 break;
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parents:
diff changeset
378 default:
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parents:
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379 break;
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parents:
diff changeset
380 }
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381 if ( ! found ) {
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382 test_format = SDL_NextAudioFormat();
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parents:
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383 }
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384 }
418
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diff changeset
385
0
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386 /* assumes test_format not 0 on success */
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parents:
diff changeset
387 if ( test_format == 0 ) {
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diff changeset
388 SDL_SetError("Couldn't find any hardware audio formats");
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parents:
diff changeset
389 return(-1);
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parents:
diff changeset
390 }
418
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diff changeset
391
0
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diff changeset
392 spec->format = test_format;
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parents:
diff changeset
393
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diff changeset
394 /* Set the audio format */
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parents:
diff changeset
395 cparams.format.format = format;
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parents:
diff changeset
396
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parents:
diff changeset
397 /* Set mono or stereo audio (currently only two channels supported) */
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diff changeset
398 cparams.format.voices = spec->channels;
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diff changeset
399
418
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diff changeset
400 #ifdef DEBUG_AUDIO
0
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diff changeset
401 fprintf(stderr,"intializing channels %d\n", cparams.format.voices);
418
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diff changeset
402 #endif
0
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diff changeset
403
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parents:
diff changeset
404 /* Set rate */
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parents:
diff changeset
405 cparams.format.rate = spec->freq ;
74212992fb08 Initial revision
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parents:
diff changeset
406
74212992fb08 Initial revision
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parents:
diff changeset
407 /* Setup the transfer parameters according to cparams */
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parents:
diff changeset
408 rval = snd_pcm_plugin_params(audio_handle, &cparams);
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parents:
diff changeset
409 if (rval < 0) {
74212992fb08 Initial revision
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parents:
diff changeset
410 SDL_SetError("snd_pcm_channel_params failed: %s\n", snd_strerror (rval));
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parents:
diff changeset
411 return(-1);
74212992fb08 Initial revision
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parents:
diff changeset
412 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
413
418
337f3ec4c385 Updated the QNX audio code for QNX 6.2 (thanks Travis!)
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diff changeset
414 /* Make sure channel is setup right one last time */
337f3ec4c385 Updated the QNX audio code for QNX 6.2 (thanks Travis!)
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parents: 297
diff changeset
415 memset( &csetup, 0, sizeof( csetup ) );
337f3ec4c385 Updated the QNX audio code for QNX 6.2 (thanks Travis!)
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parents: 297
diff changeset
416 csetup.channel = SND_PCM_CHANNEL_PLAYBACK;
337f3ec4c385 Updated the QNX audio code for QNX 6.2 (thanks Travis!)
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parents: 297
diff changeset
417 if ( snd_pcm_plugin_setup( audio_handle, &csetup ) < 0 )
337f3ec4c385 Updated the QNX audio code for QNX 6.2 (thanks Travis!)
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parents: 297
diff changeset
418 {
337f3ec4c385 Updated the QNX audio code for QNX 6.2 (thanks Travis!)
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parents: 297
diff changeset
419 SDL_SetError("Unable to setup playback channel\n" );
337f3ec4c385 Updated the QNX audio code for QNX 6.2 (thanks Travis!)
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parents: 297
diff changeset
420 return(-1);
337f3ec4c385 Updated the QNX audio code for QNX 6.2 (thanks Travis!)
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
421 }
337f3ec4c385 Updated the QNX audio code for QNX 6.2 (thanks Travis!)
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
422 else
337f3ec4c385 Updated the QNX audio code for QNX 6.2 (thanks Travis!)
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
423 {
337f3ec4c385 Updated the QNX audio code for QNX 6.2 (thanks Travis!)
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parents: 297
diff changeset
424 #ifdef DEBUG_AUDIO
337f3ec4c385 Updated the QNX audio code for QNX 6.2 (thanks Travis!)
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diff changeset
425 fprintf(stderr,"requested format: %d\n",cparams.format.format);
337f3ec4c385 Updated the QNX audio code for QNX 6.2 (thanks Travis!)
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426 fprintf(stderr,"requested frag size: %d\n",cparams.buf.block.frag_size);
337f3ec4c385 Updated the QNX audio code for QNX 6.2 (thanks Travis!)
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diff changeset
427 fprintf(stderr,"requested max frags: %d\n\n",cparams.buf.block.frags_max);
0
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parents:
diff changeset
428
418
337f3ec4c385 Updated the QNX audio code for QNX 6.2 (thanks Travis!)
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diff changeset
429 fprintf(stderr,"real format: %d\n", csetup.format.format );
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diff changeset
430 fprintf(stderr,"real frag size : %d\n", csetup.buf.block.frag_size );
0
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parents:
diff changeset
431 fprintf(stderr,"real max frags : %d\n", csetup.buf.block.frags_max );
418
337f3ec4c385 Updated the QNX audio code for QNX 6.2 (thanks Travis!)
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parents: 297
diff changeset
432 #endif
337f3ec4c385 Updated the QNX audio code for QNX 6.2 (thanks Travis!)
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parents: 297
diff changeset
433 }
0
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parents:
diff changeset
434
418
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parents: 297
diff changeset
435 /*
337f3ec4c385 Updated the QNX audio code for QNX 6.2 (thanks Travis!)
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parents: 297
diff changeset
436 Allocate memory to the audio buffer and initialize with silence (Note that
337f3ec4c385 Updated the QNX audio code for QNX 6.2 (thanks Travis!)
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parents: 297
diff changeset
437 buffer size must be a multiple of fragment size, so find closest multiple)
337f3ec4c385 Updated the QNX audio code for QNX 6.2 (thanks Travis!)
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parents: 297
diff changeset
438 */
337f3ec4c385 Updated the QNX audio code for QNX 6.2 (thanks Travis!)
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parents: 297
diff changeset
439
337f3ec4c385 Updated the QNX audio code for QNX 6.2 (thanks Travis!)
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diff changeset
440 twidth = snd_pcm_format_width(format);
337f3ec4c385 Updated the QNX audio code for QNX 6.2 (thanks Travis!)
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parents: 297
diff changeset
441 if (twidth < 0) {
337f3ec4c385 Updated the QNX audio code for QNX 6.2 (thanks Travis!)
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parents: 297
diff changeset
442 printf("snd_pcm_format_width failed\n");
337f3ec4c385 Updated the QNX audio code for QNX 6.2 (thanks Travis!)
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parents: 297
diff changeset
443 twidth = 0;
337f3ec4c385 Updated the QNX audio code for QNX 6.2 (thanks Travis!)
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
444 }
337f3ec4c385 Updated the QNX audio code for QNX 6.2 (thanks Travis!)
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parents: 297
diff changeset
445
337f3ec4c385 Updated the QNX audio code for QNX 6.2 (thanks Travis!)
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parents: 297
diff changeset
446 #ifdef DEBUG_AUDIO
337f3ec4c385 Updated the QNX audio code for QNX 6.2 (thanks Travis!)
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parents: 297
diff changeset
447 fprintf(stderr,"format is %d bits wide\n",twidth);
337f3ec4c385 Updated the QNX audio code for QNX 6.2 (thanks Travis!)
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parents: 297
diff changeset
448 #endif
0
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parents:
diff changeset
449
418
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450 pcm_len = spec->size ;
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451
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452 #ifdef DEBUG_AUDIO
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453 fprintf(stderr,"pcm_len set to %d\n", pcm_len);
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454 #endif
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455
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456 if (pcm_len == 0){
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457 pcm_len = csetup.buf.block.frag_size;
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458 }
0
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459
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460 pcm_buf = (Uint8*)malloc(pcm_len);
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461 if (pcm_buf == NULL) {
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462 SDL_SetError("pcm_buf malloc failed\n");
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463 return(-1);
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464 }
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465 memset(pcm_buf,spec->silence,pcm_len);
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466
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467 #ifdef DEBUG_AUDIO
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468 fprintf(stderr,"pcm_buf malloced and silenced.\n");
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469 #endif
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470
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471 /* get the file descriptor */
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472 if( (audio_fd = snd_pcm_file_descriptor(audio_handle, SND_PCM_CHANNEL_PLAYBACK)) < 0){
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473 fprintf(stderr, "snd_pcm_file_descriptor failed with error code: %d\n", audio_fd);
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474 }
0
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475
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476 /* Trigger audio playback */
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477 rval = snd_pcm_plugin_prepare( audio_handle, SND_PCM_CHANNEL_PLAYBACK);
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478 if (rval < 0) {
418
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479 SDL_SetError("snd_pcm_plugin_prepare failed: %s\n", snd_strerror (rval));
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480 return(-1);
0
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481 }
418
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482
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483 this->enabled = 1;
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484
0
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485 /* Get the parent process id (we're the parent of the audio thread) */
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486 parent = getpid();
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487
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488 /* We're ready to rock and roll. :-) */
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489 return(0);
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490 }