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annotate decoders/midi.c @ 202:ace10a8e632b

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author Ryan C. Gordon <icculus@icculus.org>
date Fri, 04 Jan 2002 06:51:25 +0000
parents f75ed2d72238
children c9772a9f5271
rev   line source
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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.
108
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22 *
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23 * This driver handles MIDI data through a stripped-down version of TiMidity.
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24 * See the documentation in the timidity subdirectory.
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25 *
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26 * Please see the file COPYING in the source's root directory.
108
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27 *
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28 * This file written by Torbjörn Andersson. (d91tan@Update.UU.SE)
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29 */
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30
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31 #if HAVE_CONFIG_H
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32 # include <config.h>
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33 #endif
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34
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35 #ifdef SOUND_SUPPORTS_MIDI
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36
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37 #include <stdio.h>
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38 #include <stdlib.h>
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39 #include <string.h>
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40 #include <assert.h>
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41
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42 #include "SDL_sound.h"
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43
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44 #define __SDL_SOUND_INTERNAL__
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45 #include "SDL_sound_internal.h"
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46
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47 #include "timidity.h"
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48
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49
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50 static int MIDI_init(void);
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51 static void MIDI_quit(void);
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52 static int MIDI_open(Sound_Sample *sample, const char *ext);
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53 static void MIDI_close(Sound_Sample *sample);
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54 static Uint32 MIDI_read(Sound_Sample *sample);
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55
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56 static const char *extensions_midi[] = { "MIDI", "MID", NULL };
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57 const Sound_DecoderFunctions __Sound_DecoderFunctions_MIDI =
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58 {
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59 {
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60 extensions_midi,
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61 "MIDI decoder, using a subset of TiMidity",
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62 "Torbjörn Andersson <d91tan@Update.UU.SE>",
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63 "http://www.icculus.org/SDL_sound/"
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64 },
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65
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66 MIDI_init, /* init() method */
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67 MIDI_quit, /* quit() method */
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68 MIDI_open, /* open() method */
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69 MIDI_close, /* close() method */
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70 MIDI_read /* read() method */
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71 };
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72
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73
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74 static int MIDI_init(void)
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75 {
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76 BAIL_IF_MACRO(Timidity_Init() < 0, "MIDI: Could not initialise", 0);
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77 return(1);
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78 } /* MIDI_init */
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79
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80
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81 static void MIDI_quit(void)
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82 {
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83 Timidity_Exit();
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84 } /* MIDI_quit */
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85
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86
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87 static int MIDI_open(Sound_Sample *sample, const char *ext)
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88 {
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89 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
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90 SDL_RWops *rw = internal->rw;
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91 SDL_AudioSpec spec;
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92 MidiSong *song;
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93
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94 spec.channels = 2;
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95 spec.format = AUDIO_S16SYS;
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96 spec.freq = 44100;
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97 spec.samples = 4096;
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98
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99 song = Timidity_LoadSong(rw, &spec);
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100 BAIL_IF_MACRO(song == NULL, "MIDI: Not a MIDI file.", 0);
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101 Timidity_SetVolume(song, 100);
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102 Timidity_Start(song);
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103
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104 SNDDBG(("MIDI: Accepting data stream.\n"));
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105
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106 internal->decoder_private = (void *) song;
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107
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108 sample->actual.channels = 2;
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109 sample->actual.rate = 44100;
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110 sample->actual.format = AUDIO_S16SYS;
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111
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112 sample->flags = SOUND_SAMPLEFLAG_NONE;
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113 return(1); /* we'll handle this data. */
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114 } /* MIDI_open */
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115
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116
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117 static void MIDI_close(Sound_Sample *sample)
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118 {
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119 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
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120 MidiSong *song = (MidiSong *) internal->decoder_private;
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121
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122 Timidity_FreeSong(song);
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123 } /* MIDI_close */
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124
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125
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126 static Uint32 MIDI_read(Sound_Sample *sample)
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127 {
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128 Uint32 retval;
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129 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
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130 MidiSong *song = (MidiSong *) internal->decoder_private;
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131
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132 retval = Timidity_PlaySome(song, internal->buffer, internal->buffer_size);
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133
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134 /* Make sure the read went smoothly... */
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135 if (retval == 0)
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136 sample->flags |= SOUND_SAMPLEFLAG_EOF;
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137
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138 else if (retval == -1)
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139 sample->flags |= SOUND_SAMPLEFLAG_ERROR;
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140
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141 /* (next call this EAGAIN may turn into an EOF or error.) */
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142 else if (retval < internal->buffer_size)
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143 sample->flags |= SOUND_SAMPLEFLAG_EAGAIN;
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144
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145 return(retval);
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146 } /* MIDI_read */
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147
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148 #endif /* SOUND_SUPPORTS_MIDI */
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149
200
f75ed2d72238 Rewrite to call an included, patched version of Timidity routines directly.
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150
108
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151 /* end of midi.c ... */
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152