Mercurial > SDL_sound_CoreAudio
annotate decoders/midi.c @ 274:9e7f9e09ea0e
Removed fprintf() calls. Replaced with SNDDBG() and Sound_SetError() calls.
author | Ryan C. Gordon <icculus@icculus.org> |
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date | Sun, 10 Mar 2002 19:15:25 +0000 |
parents | d3dc34315ac7 |
children | c97be6e1bd27 |
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. |
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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. |
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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 static int MIDI_rewind(Sound_Sample *sample); |
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56 |
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57 static const char *extensions_midi[] = { "MIDI", "MID", NULL }; |
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58 const Sound_DecoderFunctions __Sound_DecoderFunctions_MIDI = |
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59 { |
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60 { |
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61 extensions_midi, |
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62 "MIDI decoder, using a subset of TiMidity", |
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63 "Torbjörn Andersson <d91tan@Update.UU.SE>", |
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64 "http://www.icculus.org/SDL_sound/" |
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65 }, |
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66 |
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67 MIDI_init, /* init() method */ |
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68 MIDI_quit, /* quit() method */ |
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69 MIDI_open, /* open() method */ |
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70 MIDI_close, /* close() method */ |
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71 MIDI_read, /* read() method */ |
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72 MIDI_rewind /* rewind() method */ |
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73 }; |
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74 |
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75 |
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76 static int MIDI_init(void) |
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77 { |
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78 BAIL_IF_MACRO(Timidity_Init() < 0, "MIDI: Could not initialise", 0); |
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79 return(1); |
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80 } /* MIDI_init */ |
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81 |
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82 |
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83 static void MIDI_quit(void) |
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84 { |
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85 Timidity_Exit(); |
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86 } /* MIDI_quit */ |
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87 |
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88 |
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89 static int MIDI_open(Sound_Sample *sample, const char *ext) |
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90 { |
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91 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; |
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92 SDL_RWops *rw = internal->rw; |
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93 SDL_AudioSpec spec; |
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94 MidiSong *song; |
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95 |
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96 spec.channels = 2; |
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97 spec.format = AUDIO_S16SYS; |
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98 spec.freq = 44100; |
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99 spec.samples = 4096; |
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100 |
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101 song = Timidity_LoadSong(rw, &spec); |
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102 BAIL_IF_MACRO(song == NULL, "MIDI: Not a MIDI file.", 0); |
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103 Timidity_SetVolume(song, 100); |
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104 Timidity_Start(song); |
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105 |
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106 SNDDBG(("MIDI: Accepting data stream.\n")); |
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107 |
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108 internal->decoder_private = (void *) song; |
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109 |
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110 sample->actual.channels = 2; |
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111 sample->actual.rate = 44100; |
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112 sample->actual.format = AUDIO_S16SYS; |
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113 |
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114 sample->flags = SOUND_SAMPLEFLAG_NONE; |
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115 return(1); /* we'll handle this data. */ |
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116 } /* MIDI_open */ |
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117 |
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118 |
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119 static void MIDI_close(Sound_Sample *sample) |
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120 { |
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121 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; |
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122 MidiSong *song = (MidiSong *) internal->decoder_private; |
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123 |
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124 Timidity_FreeSong(song); |
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125 } /* MIDI_close */ |
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126 |
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127 |
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128 static Uint32 MIDI_read(Sound_Sample *sample) |
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129 { |
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130 Uint32 retval; |
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131 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; |
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132 MidiSong *song = (MidiSong *) internal->decoder_private; |
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133 |
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134 retval = Timidity_PlaySome(song, internal->buffer, internal->buffer_size); |
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135 |
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136 /* Make sure the read went smoothly... */ |
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137 if (retval == 0) |
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138 sample->flags |= SOUND_SAMPLEFLAG_EOF; |
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139 |
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140 else if (retval == -1) |
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141 sample->flags |= SOUND_SAMPLEFLAG_ERROR; |
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142 |
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143 /* (next call this EAGAIN may turn into an EOF or error.) */ |
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144 else if (retval < internal->buffer_size) |
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145 sample->flags |= SOUND_SAMPLEFLAG_EAGAIN; |
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146 |
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147 return(retval); |
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148 } /* MIDI_read */ |
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149 |
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150 |
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151 static int MIDI_rewind(Sound_Sample *sample) |
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152 { |
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153 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; |
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154 MidiSong *song = (MidiSong *) internal->decoder_private; |
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155 |
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156 Timidity_Start(song); |
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157 return(1); |
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158 } /* MIDI_rewind */ |
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159 |
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160 #endif /* SOUND_SUPPORTS_MIDI */ |
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161 |
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162 |
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163 /* end of midi.c ... */ |
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164 |