Mercurial > SDL_sound_CoreAudio
view decoders/midi.c @ 466:75819e5c59d4
Build system fixes.
author | Ryan C. Gordon <icculus@icculus.org> |
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date | Wed, 15 Oct 2003 02:21:31 +0000 |
parents | cbb15ecf423a |
children | c66080364dff 45ee760a6f5a |
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/* * SDL_sound -- An abstract sound format decoding API. * Copyright (C) 2001 Ryan C. Gordon. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ /* * MIDI decoder for SDL_sound. * * This driver handles MIDI data through a stripped-down version of TiMidity. * See the documentation in the timidity subdirectory. * * Please see the file COPYING in the source's root directory. * * This file written by Torbjörn Andersson. (d91tan@Update.UU.SE) */ #if HAVE_CONFIG_H # include <config.h> #endif #ifdef SOUND_SUPPORTS_MIDI #include <stdio.h> #include <stdlib.h> #include <string.h> #include "SDL_sound.h" #define __SDL_SOUND_INTERNAL__ #include "SDL_sound_internal.h" #include "timidity.h" static int MIDI_init(void); static void MIDI_quit(void); static int MIDI_open(Sound_Sample *sample, const char *ext); static void MIDI_close(Sound_Sample *sample); static Uint32 MIDI_read(Sound_Sample *sample); static int MIDI_rewind(Sound_Sample *sample); static int MIDI_seek(Sound_Sample *sample, Uint32 ms); static const char *extensions_midi[] = { "MIDI", "MID", NULL }; const Sound_DecoderFunctions __Sound_DecoderFunctions_MIDI = { { extensions_midi, "MIDI decoder, using a subset of TiMidity", "Torbjörn Andersson <d91tan@Update.UU.SE>", "http://www.icculus.org/SDL_sound/" }, MIDI_init, /* init() method */ MIDI_quit, /* quit() method */ MIDI_open, /* open() method */ MIDI_close, /* close() method */ MIDI_read, /* read() method */ MIDI_rewind, /* rewind() method */ MIDI_seek /* seek() method */ }; static int MIDI_init(void) { BAIL_IF_MACRO(Timidity_Init() < 0, "MIDI: Could not initialise", 0); return(1); } /* MIDI_init */ static void MIDI_quit(void) { Timidity_Exit(); } /* MIDI_quit */ static int MIDI_open(Sound_Sample *sample, const char *ext) { Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; SDL_RWops *rw = internal->rw; SDL_AudioSpec spec; MidiSong *song; spec.channels = 2; spec.format = AUDIO_S16SYS; spec.freq = 44100; spec.samples = 4096; song = Timidity_LoadSong(rw, &spec); BAIL_IF_MACRO(song == NULL, "MIDI: Not a MIDI file.", 0); Timidity_SetVolume(song, 100); Timidity_Start(song); SNDDBG(("MIDI: Accepting data stream.\n")); internal->decoder_private = (void *) song; sample->actual.channels = 2; sample->actual.rate = 44100; sample->actual.format = AUDIO_S16SYS; sample->flags = SOUND_SAMPLEFLAG_CANSEEK; return(1); /* we'll handle this data. */ } /* MIDI_open */ static void MIDI_close(Sound_Sample *sample) { Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; MidiSong *song = (MidiSong *) internal->decoder_private; Timidity_FreeSong(song); } /* MIDI_close */ static Uint32 MIDI_read(Sound_Sample *sample) { Uint32 retval; Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; MidiSong *song = (MidiSong *) internal->decoder_private; retval = Timidity_PlaySome(song, internal->buffer, internal->buffer_size); /* Make sure the read went smoothly... */ if (retval == 0) sample->flags |= SOUND_SAMPLEFLAG_EOF; else if (retval == -1) sample->flags |= SOUND_SAMPLEFLAG_ERROR; /* (next call this EAGAIN may turn into an EOF or error.) */ else if (retval < internal->buffer_size) sample->flags |= SOUND_SAMPLEFLAG_EAGAIN; return(retval); } /* MIDI_read */ static int MIDI_rewind(Sound_Sample *sample) { Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; MidiSong *song = (MidiSong *) internal->decoder_private; Timidity_Start(song); return(1); } /* MIDI_rewind */ static int MIDI_seek(Sound_Sample *sample, Uint32 ms) { Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; MidiSong *song = (MidiSong *) internal->decoder_private; Timidity_Seek(song, ms); return(1); } /* MIDI_seek */ #endif /* SOUND_SUPPORTS_MIDI */ /* end of midi.c ... */