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296 lines
9.6 KiB
296 lines
9.6 KiB
/*****************************************************************************
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* fluidsynth.c: Software MIDI synthesizer using libfluidsynth
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*****************************************************************************
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* Copyright © 2007 Rémi Denis-Courmont
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* $Id$
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <vlc_common.h>
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#include <vlc_plugin.h>
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#include <vlc_codec.h>
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#include <vlc_dialog.h>
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#include <unistd.h>
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#ifdef _POSIX_VERSION
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# include <glob.h>
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#endif
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/* On Win32, we link statically */
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#ifdef _WIN32
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# define FLUIDSYNTH_NOT_A_DLL
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#endif
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#include <fluidsynth.h>
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#define SOUNDFONT_TEXT N_("Sound fonts")
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#define SOUNDFONT_LONGTEXT N_( \
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"A sound fonts file is required for software synthesis." )
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#define CHORUS_TEXT N_("Chorus")
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#define GAIN_TEXT N_("Synthesis gain")
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#define GAIN_LONGTEXT N_("This gain is applied to synthesis output. " \
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"High values may cause saturation when many notes are played at a time." )
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#define POLYPHONY_TEXT N_("Polyphony")
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#define POLYPHONY_LONGTEXT N_( \
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"The polyphony defines how many voices can be played at a time. " \
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"Larger values require more processing power.")
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#define REVERB_TEXT N_("Reverb")
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#define SAMPLE_RATE_TEXT N_("Sample rate")
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static int Open (vlc_object_t *);
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static void Close (vlc_object_t *);
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vlc_module_begin ()
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set_description (N_("FluidSynth MIDI synthesizer"))
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set_capability ("decoder", 100)
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set_shortname (N_("FluidSynth"))
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set_category (CAT_INPUT)
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set_subcategory (SUBCAT_INPUT_ACODEC)
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set_callbacks (Open, Close)
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add_loadfile ("soundfont", "",
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SOUNDFONT_TEXT, SOUNDFONT_LONGTEXT, false)
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add_bool ("synth-chorus", true, CHORUS_TEXT, CHORUS_TEXT, false)
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add_float ("synth-gain", .5, GAIN_TEXT, GAIN_LONGTEXT, false)
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change_float_range (0., 10.)
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add_integer ("synth-polyphony", 256,
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POLYPHONY_TEXT, POLYPHONY_LONGTEXT, false)
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change_integer_range (1, 65535)
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add_bool ("synth-reverb", true, REVERB_TEXT, REVERB_TEXT, true)
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add_integer ("synth-sample-rate", 44100,
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SAMPLE_RATE_TEXT, SAMPLE_RATE_TEXT, true)
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change_integer_range (22050, 96000)
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vlc_module_end ()
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struct decoder_sys_t
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{
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fluid_settings_t *settings;
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fluid_synth_t *synth;
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int soundfont;
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date_t end_date;
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};
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static block_t *DecodeBlock (decoder_t *p_dec, block_t **pp_block);
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static int Open (vlc_object_t *p_this)
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{
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decoder_t *p_dec = (decoder_t *)p_this;
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if (p_dec->fmt_in.i_codec != VLC_CODEC_MIDI)
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return VLC_EGENERIC;
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decoder_sys_t *p_sys = malloc (sizeof (*p_sys));
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if (unlikely(p_sys == NULL))
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return VLC_ENOMEM;
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p_sys->settings = new_fluid_settings ();
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p_sys->synth = new_fluid_synth (p_sys->settings);
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p_sys->soundfont = -1;
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char *font_path = var_InheritString (p_this, "soundfont");
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if (font_path != NULL)
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{
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msg_Dbg (p_this, "loading sound fonts file %s", font_path);
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p_sys->soundfont = fluid_synth_sfload (p_sys->synth, font_path, 1);
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if (p_sys->soundfont == -1)
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msg_Err (p_this, "cannot load sound fonts file %s", font_path);
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free (font_path);
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}
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#ifdef _POSIX_VERSION
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else
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{
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glob_t gl;
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glob ("/usr/share/sounds/sf2/*.sf2", GLOB_NOESCAPE, NULL, &gl);
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for (size_t i = 0; i < gl.gl_pathc; i++)
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{
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const char *path = gl.gl_pathv[i];
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msg_Dbg (p_this, "loading sound fonts file %s", path);
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p_sys->soundfont = fluid_synth_sfload (p_sys->synth, path, 1);
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if (p_sys->soundfont != -1)
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break; /* it worked! */
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msg_Err (p_this, "cannot load sound fonts file %s", path);
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}
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globfree (&gl);
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}
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#endif
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if (p_sys->soundfont == -1)
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{
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msg_Err (p_this, "sound font file required for synthesis");
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dialog_Fatal (p_this, _("MIDI synthesis not set up"),
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_("A sound font file (.SF2) is required for MIDI synthesis.\n"
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"Please install a sound font and configure it "
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"from the VLC preferences "
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"(Input / Codecs > Audio codecs > FluidSynth).\n"));
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delete_fluid_synth (p_sys->synth);
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delete_fluid_settings (p_sys->settings);
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free (p_sys);
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return VLC_EGENERIC;
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}
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fluid_synth_set_chorus_on (p_sys->synth,
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var_InheritBool (p_this, "synth-chorus"));
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fluid_synth_set_gain (p_sys->synth,
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var_InheritFloat (p_this, "synth-gain"));
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fluid_synth_set_polyphony (p_sys->synth,
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var_InheritInteger (p_this, "synth-polyphony"));
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fluid_synth_set_reverb_on (p_sys->synth,
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var_InheritBool (p_this, "synth-reverb"));
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p_dec->fmt_out.i_cat = AUDIO_ES;
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p_dec->fmt_out.audio.i_rate =
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var_InheritInteger (p_this, "synth-sample-rate");;
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fluid_synth_set_sample_rate (p_sys->synth, p_dec->fmt_out.audio.i_rate);
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p_dec->fmt_out.audio.i_channels = 2;
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p_dec->fmt_out.audio.i_original_channels =
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p_dec->fmt_out.audio.i_physical_channels =
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AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
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p_dec->fmt_out.i_codec = VLC_CODEC_FL32;
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p_dec->fmt_out.audio.i_bitspersample = 32;
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date_Init (&p_sys->end_date, p_dec->fmt_out.audio.i_rate, 1);
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date_Set (&p_sys->end_date, 0);
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p_dec->p_sys = p_sys;
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p_dec->pf_decode_audio = DecodeBlock;
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return VLC_SUCCESS;
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}
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static void Close (vlc_object_t *p_this)
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{
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decoder_sys_t *p_sys = ((decoder_t *)p_this)->p_sys;
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fluid_synth_sfunload (p_sys->synth, p_sys->soundfont, 1);
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delete_fluid_synth (p_sys->synth);
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delete_fluid_settings (p_sys->settings);
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free (p_sys);
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}
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static block_t *DecodeBlock (decoder_t *p_dec, block_t **pp_block)
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{
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block_t *p_block;
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decoder_sys_t *p_sys = p_dec->p_sys;
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block_t *p_out = NULL;
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if (pp_block == NULL)
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return NULL;
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p_block = *pp_block;
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if (p_block == NULL)
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return NULL;
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*pp_block = NULL;
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if (p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED))
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{
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date_Set (&p_sys->end_date, 0);
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//fluid_synth_system_reset (p_sys->synth);
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fluid_synth_program_reset (p_sys->synth);
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for (unsigned channel = 0; channel < 16; channel++)
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for (unsigned note = 0; note < 128; note++)
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fluid_synth_noteoff (p_sys->synth, channel, note);
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}
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if (p_block->i_pts > VLC_TS_INVALID && !date_Get (&p_sys->end_date))
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date_Set (&p_sys->end_date, p_block->i_pts);
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else
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if (p_block->i_pts < date_Get (&p_sys->end_date))
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{
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msg_Warn (p_dec, "MIDI message in the past?");
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goto drop;
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}
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if (p_block->i_buffer < 1)
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goto drop;
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uint8_t event = p_block->p_buffer[0];
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uint8_t channel = p_block->p_buffer[0] & 0xf;
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event &= 0xF0;
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if (event == 0xF0)
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switch (channel)
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{
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case 0:
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if (p_block->p_buffer[p_block->i_buffer - 1] != 0xF7)
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{
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case 7:
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msg_Warn (p_dec, "fragmented SysEx not implemented");
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goto drop;
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}
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fluid_synth_sysex (p_sys->synth, (char *)p_block->p_buffer + 1,
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p_block->i_buffer - 2, NULL, NULL, NULL, 0);
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break;
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case 0xF:
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fluid_synth_system_reset (p_sys->synth);
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break;
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}
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uint8_t p1 = (p_block->i_buffer > 1) ? (p_block->p_buffer[1] & 0x7f) : 0;
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uint8_t p2 = (p_block->i_buffer > 2) ? (p_block->p_buffer[2] & 0x7f) : 0;
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switch (event & 0xF0)
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{
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case 0x80:
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fluid_synth_noteoff (p_sys->synth, channel, p1);
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break;
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case 0x90:
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fluid_synth_noteon (p_sys->synth, channel, p1, p2);
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break;
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/*case 0xA0: note aftertouch not implemented */
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case 0xB0:
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fluid_synth_cc (p_sys->synth, channel, p1, p2);
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break;
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case 0xC0:
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fluid_synth_program_change (p_sys->synth, channel, p1);
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break;
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case 0xD0:
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fluid_synth_channel_pressure (p_sys->synth, channel, p1);
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break;
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case 0xE0:
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fluid_synth_pitch_bend (p_sys->synth, channel, (p2 << 7) | p1);
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break;
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}
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unsigned samples =
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(p_block->i_pts - date_Get (&p_sys->end_date)) * 441 / 10000;
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if (samples == 0)
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goto drop;
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p_out = decoder_NewAudioBuffer (p_dec, samples);
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if (p_out == NULL)
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goto drop;
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p_out->i_pts = date_Get (&p_sys->end_date );
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p_out->i_length = date_Increment (&p_sys->end_date, samples)
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- p_out->i_pts;
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fluid_synth_write_float (p_sys->synth, samples, p_out->p_buffer, 0, 2,
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p_out->p_buffer, 1, 2);
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drop:
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block_Release (p_block);
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return p_out;
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}
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