fluidsynth.c
author Sam Lantinga <slouken@libsdl.org>
Sat, 02 Jan 2016 10:46:07 -0800
changeset 711 f40c5ac95b12
parent 705 fe757163b8f7
child 725 bdf7b8d20566
permissions -rw-r--r--
Updated copyright to 2016
     1 /*
     2   SDL_mixer:  An audio mixer library based on the SDL library
     3   Copyright (C) 1997-2016 Sam Lantinga <slouken@libsdl.org>
     4 
     5   This software is provided 'as-is', without any express or implied
     6   warranty.  In no event will the authors be held liable for any damages
     7   arising from the use of this software.
     8 
     9   Permission is granted to anyone to use this software for any purpose,
    10   including commercial applications, and to alter it and redistribute it
    11   freely, subject to the following restrictions:
    12 
    13   1. The origin of this software must not be misrepresented; you must not
    14      claim that you wrote the original software. If you use this software
    15      in a product, an acknowledgment in the product documentation would be
    16      appreciated but is not required.
    17   2. Altered source versions must be plainly marked as such, and must not be
    18      misrepresented as being the original software.
    19   3. This notice may not be removed or altered from any source distribution.
    20 
    21   James Le Cuirot
    22   chewi@aura-online.co.uk
    23 */
    24 
    25 #ifdef USE_FLUIDSYNTH_MIDI
    26 
    27 #include <stdio.h>
    28 #include <sys/types.h>
    29 
    30 #include "SDL_mixer.h"
    31 #include "fluidsynth.h"
    32 
    33 static Uint16 format;
    34 static Uint8 channels;
    35 static int freq;
    36 
    37 int fluidsynth_check_soundfont(const char *path, void *data)
    38 {
    39     FILE *file = fopen(path, "r");
    40 
    41     if (file) {
    42         fclose(file);
    43         return 1;
    44     } else {
    45         Mix_SetError("Failed to access the SoundFont %s", path);
    46         return 0;
    47     }
    48 }
    49 
    50 int fluidsynth_load_soundfont(const char *path, void *data)
    51 {
    52     /* If this fails, it's too late to try Timidity so pray that at least one works. */
    53     fluidsynth.fluid_synth_sfload((fluid_synth_t*) data, path, 1);
    54     return 1;
    55 }
    56 
    57 int fluidsynth_init(SDL_AudioSpec *mixer)
    58 {
    59     if (!Mix_EachSoundFont(fluidsynth_check_soundfont, NULL))
    60         return -1;
    61 
    62     format = mixer->format;
    63     channels = mixer->channels;
    64     freq = mixer->freq;
    65 
    66     return 0;
    67 }
    68 
    69 static FluidSynthMidiSong *fluidsynth_loadsong_common(int (*function)(FluidSynthMidiSong*, void*), void *data)
    70 {
    71     FluidSynthMidiSong *song;
    72     fluid_settings_t *settings = NULL;
    73 
    74     if (!Mix_Init(MIX_INIT_FLUIDSYNTH)) {
    75         return NULL;
    76     }
    77 
    78     if ((song = SDL_malloc(sizeof(FluidSynthMidiSong)))) {
    79         SDL_memset(song, 0, sizeof(FluidSynthMidiSong));
    80 
    81         if (SDL_BuildAudioCVT(&song->convert, AUDIO_S16, 2, freq, format, channels, freq) >= 0) {
    82             if ((settings = fluidsynth.new_fluid_settings())) {
    83                 fluidsynth.fluid_settings_setnum(settings, "synth.sample-rate", (double) freq);
    84 
    85                 if ((song->synth = fluidsynth.new_fluid_synth(settings))) {
    86                     if (Mix_EachSoundFont(fluidsynth_load_soundfont, (void*) song->synth)) {
    87                         if ((song->player = fluidsynth.new_fluid_player(song->synth))) {
    88                             if (function(song, data)) return song;
    89                             fluidsynth.delete_fluid_player(song->player);
    90                         } else {
    91                             Mix_SetError("Failed to create FluidSynth player");
    92                         }
    93                     }
    94                     fluidsynth.delete_fluid_synth(song->synth);
    95                 } else {
    96                     Mix_SetError("Failed to create FluidSynth synthesizer");
    97                 }
    98                 fluidsynth.delete_fluid_settings(settings);
    99             } else {
   100                 Mix_SetError("Failed to create FluidSynth settings");
   101             }
   102         } else {
   103             Mix_SetError("Failed to set up audio conversion");
   104         }
   105         SDL_free(song);
   106     } else {
   107         Mix_SetError("Insufficient memory for song");
   108     }
   109     return NULL;
   110 }
   111 
   112 static int fluidsynth_loadsong_RW_internal(FluidSynthMidiSong *song, void *data)
   113 {
   114     Sint64 offset;
   115     size_t size;
   116     char *buffer;
   117     SDL_RWops *src = (SDL_RWops*) data;
   118 
   119     offset = SDL_RWtell(src);
   120     SDL_RWseek(src, 0, RW_SEEK_END);
   121     size = (size_t)(SDL_RWtell(src) - offset);
   122     SDL_RWseek(src, offset, RW_SEEK_SET);
   123 
   124     if ((buffer = (char*) SDL_malloc(size))) {
   125         if(SDL_RWread(src, buffer, size, 1) == 1) {
   126             if (fluidsynth.fluid_player_add_mem(song->player, buffer, size) == FLUID_OK) {
   127                 SDL_free(buffer);
   128                 return 1;
   129             } else {
   130                 Mix_SetError("FluidSynth failed to load in-memory song");
   131             }
   132         } else {
   133             Mix_SetError("Failed to read in-memory song");
   134         }
   135         SDL_free(buffer);
   136     } else {
   137         Mix_SetError("Insufficient memory for song");
   138     }
   139     return 0;
   140 }
   141 
   142 FluidSynthMidiSong *fluidsynth_loadsong_RW(SDL_RWops *src, int freesrc)
   143 {
   144     FluidSynthMidiSong *song;
   145 
   146     song = fluidsynth_loadsong_common(fluidsynth_loadsong_RW_internal, (void*) src);
   147     if (song && freesrc) {
   148         SDL_RWclose(src);
   149     }
   150     return song;
   151 }
   152 
   153 void fluidsynth_freesong(FluidSynthMidiSong *song)
   154 {
   155     if (!song) return;
   156     fluidsynth.delete_fluid_player(song->player);
   157     fluidsynth.delete_fluid_settings(fluidsynth.fluid_synth_get_settings(song->synth));
   158     fluidsynth.delete_fluid_synth(song->synth);
   159     SDL_free(song);
   160 }
   161 
   162 void fluidsynth_start(FluidSynthMidiSong *song)
   163 {
   164     fluidsynth.fluid_player_set_loop(song->player, 1);
   165     fluidsynth.fluid_player_play(song->player);
   166 }
   167 
   168 void fluidsynth_stop(FluidSynthMidiSong *song)
   169 {
   170     fluidsynth.fluid_player_stop(song->player);
   171 }
   172 
   173 int fluidsynth_active(FluidSynthMidiSong *song)
   174 {
   175     return fluidsynth.fluid_player_get_status(song->player) == FLUID_PLAYER_PLAYING ? 1 : 0;
   176 }
   177 
   178 void fluidsynth_setvolume(FluidSynthMidiSong *song, int volume)
   179 {
   180     /* FluidSynth's default is 0.2. Make 1.2 the maximum. */
   181     fluidsynth.fluid_synth_set_gain(song->synth, (float) (volume * 1.2 / MIX_MAX_VOLUME));
   182 }
   183 
   184 int fluidsynth_playsome(FluidSynthMidiSong *song, void *dest, int dest_len)
   185 {
   186     int result = -1;
   187     int frames = dest_len / channels / ((format & 0xFF) / 8);
   188     int src_len = frames * 4; /* 16-bit stereo */
   189     void *src = dest;
   190 
   191     if (dest_len < src_len) {
   192         if (!(src = SDL_malloc(src_len))) {
   193             Mix_SetError("Insufficient memory for audio conversion");
   194             return result;
   195         }
   196     }
   197 
   198     if (fluidsynth.fluid_synth_write_s16(song->synth, frames, src, 0, 2, src, 1, 2) != FLUID_OK) {
   199         Mix_SetError("Error generating FluidSynth audio");
   200         goto finish;
   201     }
   202 
   203     song->convert.buf = src;
   204     song->convert.len = src_len;
   205 
   206     if (SDL_ConvertAudio(&song->convert) < 0) {
   207         Mix_SetError("Error during audio conversion");
   208         goto finish;
   209     }
   210 
   211     if (src != dest)
   212         SDL_memcpy(dest, src, dest_len);
   213 
   214     result = 0;
   215 
   216 finish:
   217     if (src != dest)
   218         SDL_free(src);
   219 
   220     return result;
   221 }
   222 
   223 #endif /* USE_FLUIDSYNTH_MIDI */