Mercurial > SDL_sound_CoreAudio

annotate decoders/midi.c @ 114:dd95a12539fd

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Changed an #if defined to #ifdef, for consistency with the other decoders.
author Ryan C. Gordon <icculus@icculus.org>
date Thu, 04 Oct 2001 19:35:53 +0000
parents 803ba4dabbce
children 70baf29577d8
rev   line source
108
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1 /*
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2 * SDL_sound -- An abstract sound format decoding API.
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3 * Copyright (C) 2001 Ryan C. Gordon.
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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 Lesser General Public
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7 * License as published by the Free Software Foundation; either
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8 * version 2.1 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 * Lesser 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 Lesser General Public
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16 * License along with this library; if not, write to the Free Software
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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
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20 /*
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21 * MIDI decoder for SDL_sound, using TiMidity.
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22 *
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23 * This is a rough, proof-of-concept implementation. A number of things need
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24 * to be fixed or at the very least looked at:
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25 *
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26 * - I have only tested this with TiMidity++. Does TiMidity use the same
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27 * command-line options?
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28 * - No attempt is made to ensure that the input really is MIDI. Eek. Does
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29 * anyone here know how to recognize MIDI?
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30 * - Error handling is a joke.
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31 * - Did I make any stupid errors in the process communication?
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32 * - TiMidity++ spews a number of messages (to stderr?) which should be
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33 * silenced eventually.
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34 * - This has to be the least portable decoder that has ever been written.
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35 * - Etc.
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36 *
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37 * Oh, and the whole thing should be rewritten as a generic "send data to
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38 * external decoder" thing so this version should either be scrapped or
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39 * cannibalized for ideas. :-)
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40 *
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41 * Please see the file LICENSE in the source's root directory.
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42 *
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43 * This file written by Torbjörn Andersson. (d91tan@Update.UU.SE)
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44 */
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45
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46 #if HAVE_CONFIG_H
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47 # include <config.h>
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48 #endif
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49
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50 #ifdef SOUND_SUPPORTS_MIDI
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51
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52 #include <stdio.h>
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53 #include <stdlib.h>
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54 #include <string.h>
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55 #include <assert.h>
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56 #include <unistd.h>
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57 #include <signal.h>
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58 #include <sys/types.h>
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59 #include <sys/wait.h>
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60 #include "SDL_sound.h"
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61
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62 #define __SDL_SOUND_INTERNAL__
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63 #include "SDL_sound_internal.h"
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64
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65
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66 static int MIDI_init(void);
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67 static void MIDI_quit(void);
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68 static int MIDI_open(Sound_Sample *sample, const char *ext);
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69 static void MIDI_close(Sound_Sample *sample);
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70 static Uint32 MIDI_read(Sound_Sample *sample);
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71
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72 const Sound_DecoderFunctions __Sound_DecoderFunctions_MIDI =
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73 {
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74 {
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75 "MIDI",
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76 "MIDI music through the TiMidity MIDI to WAVE converter",
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77 "Torbjörn Andersson <d91tan@Update.UU.SE>",
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78 "http://www.goice.co.jp/member/mo/timidity/"
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79 },
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80
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81 MIDI_init, /* init() method */
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82 MIDI_quit, /* quit() method */
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83 MIDI_open, /* open() method */
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84 MIDI_close, /* close() method */
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85 MIDI_read /* read() method */
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86 };
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87
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88 /* this is what we store in our internal->decoder_private field... */
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89 typedef struct
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90 {
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91 int fd_audio;
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92 } midi_t;
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93
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94
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95 static void sig_pipe(int signo)
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96 {
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97 signal(signo, sig_pipe);
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98 } /* sig_pipe */
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99
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100
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101 static int MIDI_init(void)
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102 {
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103 if (signal(SIGPIPE, sig_pipe) == SIG_ERR)
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104 {
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105 Sound_SetError("MIDI: Could not set up SIGPIPE signal handler.");
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106 return(0);
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107 } /* if */
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108 return(1);
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109 } /* MIDI_init */
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110
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111
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112 static void MIDI_quit(void)
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113 {
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114 /* it's a no-op. */
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115 } /* MIDI_quit */
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116
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117
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118 static int MIDI_open(Sound_Sample *sample, const char *ext)
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119 {
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120 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
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121 SDL_RWops *rw = internal->rw;
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122 midi_t *m;
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123 Uint8 buf[BUFSIZ];
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124 ssize_t retval;
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125 int fd1[2];
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126 int fd2[2];
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127 pid_t pid;
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128
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129 /* TiMidity does all the conversions we need. */
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130 memcpy(&sample->actual, &sample->desired, sizeof (Sound_AudioInfo));
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131 sample->flags = SOUND_SAMPLEFLAG_NONE;
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132
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133 if (pipe(fd1) < 0 || pipe(fd2) < 0)
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134 {
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135 Sound_SetError("MIDI: Pipe error.");
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136 return(0);
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137 } /* if */
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138
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139 pid = fork();
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140 if (pid < 0)
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141 {
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142 Sound_SetError("MIDI: Fork error.");
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143 return(0);
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144 } /* if */
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145
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146 if (pid == 0)
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147 {
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148 /* child */
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149 char arg_freq[10]; /* !!! FIXME: Large enough? */
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150 char arg_format[10];
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151 char *arg_list[] =
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152 { "timidity", "-s", NULL, NULL, "-o", "-", "-", NULL };
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153
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154 arg_list[2] = arg_freq;
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155 arg_list[3] = arg_format;
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156
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157 close(fd1[1]);
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158 close(fd2[0]);
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159
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160 /* !!! FIXME: Errors should be propagated back to the parent */
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161
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162 if (fd1[0] != STDIN_FILENO)
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163 {
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164 if (dup2(fd1[0], STDIN_FILENO) != STDIN_FILENO)
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165 return(0);
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166 close(fd1[0]);
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167 } /* if */
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168
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169 if (fd2[1] != STDOUT_FILENO)
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170 {
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171 if (dup2(fd2[1], STDOUT_FILENO) != STDOUT_FILENO)
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172 return(0);
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173 close(fd2[1]);
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174 } /* if */
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175
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176 /* Construct command-line arguments matching the audio format */
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177 sprintf(arg_freq, "%d", sample->actual.rate);
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178 sprintf(arg_format, "-Or%c%c%cl",
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179 (sample->actual.format & 0x0008) ? '8' : '1',
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180 (sample->actual.format & 0x8000) ? 's' : 'u',
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181 (sample->actual.channels == 1) ? 'M' : 'S');
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182 if ((sample->actual.format & 0x0010) &&
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Ryan C. Gordon <icculus@icculus.org>
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183 (sample->actual.format & 0x7fff) != (AUDIO_S16SYS & 0x7fff))
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184 strcat(arg_format, "x");
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185
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186 if (execvp("timidity", arg_list) < 0)
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187 return(0);
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188
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189 SNDDBG(("MIDI: Is this line ever reached?"));
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190 return(1);
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191 } /* if */
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192
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193 /* parent */
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194 close(fd1[0]);
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195 close(fd2[1]);
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196
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197 /* Copy the entire file to the child process */
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198 for (;;)
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199 {
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200 retval = SDL_RWread(internal->rw, buf, 1, BUFSIZ);
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201 if (retval == 0)
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202 break;
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203
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204 if (write(fd1[1], buf, retval) != retval)
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205 {
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Ryan C. Gordon <icculus@icculus.org>
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206 Sound_SetError("MIDI: Could not send data to child process.");
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Ryan C. Gordon <icculus@icculus.org>
parents:
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207 return(0);
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Ryan C. Gordon <icculus@icculus.org>
parents:
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208 }
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Ryan C. Gordon <icculus@icculus.org>
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209 } /* for */
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210
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211 close(fd1[1]);
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212
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213 /* !!! FIXME: We still need some way of recognizing valid MIDI data */
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214
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215 m = (midi_t *) malloc(sizeof(midi_t));
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Ryan C. Gordon <icculus@icculus.org>
parents:
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216 BAIL_IF_MACRO(m == NULL, ERR_OUT_OF_MEMORY, 0);
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217 internal->decoder_private = (void *) m;
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218
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219 /* This is where we'll read the converted audio data. */
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220 m->fd_audio = fd2[0];
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221
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222 SNDDBG(("MIDI: Accepting data stream.\n"));
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223 return(1); /* we'll handle this data. */
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224 } /* MIDI_open */
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225
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226
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227 static void MIDI_close(Sound_Sample *sample)
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228 {
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229 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
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230
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231 close(((midi_t *) internal->decoder_private)->fd_audio);
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232 free(internal->decoder_private);
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233 } /* MIDI_close */
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234
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235
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Ryan C. Gordon <icculus@icculus.org>
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236 static Uint32 MIDI_read(Sound_Sample *sample)
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237 {
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parents:
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238 ssize_t retval;
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239 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
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240 midi_t *m = (midi_t *) internal->decoder_private;
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241
803ba4dabbce Initial add, from Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
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242 /*
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Ryan C. Gordon <icculus@icculus.org>
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243 * We don't actually do any decoding, so we read the converted data
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Ryan C. Gordon <icculus@icculus.org>
parents:
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244 * directly into the internal buffer.
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Ryan C. Gordon <icculus@icculus.org>
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245 */
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246 retval = read(m->fd_audio, internal->buffer, internal->buffer_size);
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parents:
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247
803ba4dabbce Initial add, from Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents:
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248 /* Make sure the read went smoothly... */
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
249 if (retval == 0)
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Ryan C. Gordon <icculus@icculus.org>
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250 sample->flags |= SOUND_SAMPLEFLAG_EOF;
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parents:
diff changeset
251
803ba4dabbce Initial add, from Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
252 else if (retval == -1)
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
253 sample->flags |= SOUND_SAMPLEFLAG_ERROR;
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Ryan C. Gordon <icculus@icculus.org>
parents:
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254
803ba4dabbce Initial add, from Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents:
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255 /* (next call this EAGAIN may turn into an EOF or error.) */
803ba4dabbce Initial add, from Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
256 else if (retval < internal->buffer_size)
803ba4dabbce Initial add, from Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
257 sample->flags |= SOUND_SAMPLEFLAG_EAGAIN;
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
258
803ba4dabbce Initial add, from Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
259 return(retval);
803ba4dabbce Initial add, from Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
260 } /* MIDI_read */
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Ryan C. Gordon <icculus@icculus.org>
parents:
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261
803ba4dabbce Initial add, from Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents:
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262 #endif /* SOUND_SUPPORTS_MIDI */
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Ryan C. Gordon <icculus@icculus.org>
parents:
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263
803ba4dabbce Initial add, from Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
264 /* end of midi.c ... */
803ba4dabbce Initial add, from Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
265