--- /dev/null
+/*****************************************************************************
+ * fluidsynth.c: Software MIDI synthetizer using libfluidsynth
+ *****************************************************************************
+ * Copyright © 2007 Rémi Denis-Courmont
+ * $Id$
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
+ *****************************************************************************/
+
+#include <vlc/vlc.h>
+#include <vlc_aout.h>
+#include <vlc_codec.h>
+
+#include <fluidsynth.h>
+
+#define SOUNDFONT_TEXT N_("Sound fonts (required)")
+#define SOUNDFONT_LONGTEXT N_( \
+ "A sound fonts file is required for software synthesis." )
+
+static int Open (vlc_object_t *);
+static void Close (vlc_object_t *);
+
+vlc_module_begin();
+ set_description (_("FluidSynth MIDI synthetizer"));
+ set_capability ("decoder", 100);
+ set_category (CAT_INPUT);
+ set_subcategory (SUBCAT_INPUT_ACODEC);
+ set_callbacks (Open, Close);
+ add_file ("soundfont", "", NULL,
+ SOUNDFONT_TEXT, SOUNDFONT_LONGTEXT, VLC_FALSE);
+vlc_module_end();
+
+
+struct decoder_sys_t
+{
+ fluid_settings_t *settings;
+ fluid_synth_t *synth;
+ int soundfont;
+ audio_date_t end_date;
+};
+
+
+static aout_buffer_t *DecodeBlock (decoder_t *p_dec, block_t **pp_block);
+
+
+static int Open (vlc_object_t *p_this)
+{
+ decoder_t *p_dec = (decoder_t *)p_this;
+ decoder_sys_t *p_sys;
+
+ if (p_dec->fmt_in.i_codec != VLC_FOURCC ('M', 'I', 'D', 'I'))
+ return VLC_EGENERIC;
+
+ char *font_path = var_CreateGetNonEmptyString (p_this, "soundfont");
+ if (font_path == NULL)
+ {
+ msg_Err (p_this, "sound fonts file required for synthesis");
+ return VLC_EGENERIC;
+ }
+
+ p_dec->fmt_out.i_cat = AUDIO_ES;
+ p_dec->fmt_out.audio.i_rate = 44100;
+ p_dec->fmt_out.audio.i_channels = 2;
+ p_dec->fmt_out.audio.i_original_channels =
+ p_dec->fmt_out.audio.i_physical_channels =
+ AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
+ p_dec->fmt_out.i_codec = AOUT_FMT_S16_NE;
+ p_dec->fmt_out.audio.i_bitspersample = 16;
+
+ p_dec->pf_decode_audio = DecodeBlock;
+ p_sys = p_dec->p_sys = malloc (sizeof (*p_sys));
+ if (p_sys == NULL)
+ {
+ free (font_path);
+ return VLC_ENOMEM;
+ }
+
+ p_sys->settings = new_fluid_settings ();
+ p_sys->synth = new_fluid_synth (p_sys->settings);
+ /* FIXME: I bet this is not thread-safe */
+ p_sys->soundfont = fluid_synth_sfload (p_sys->synth, font_path, 1);
+ free (font_path);
+ if (p_sys->soundfont == -1)
+ {
+ msg_Err (p_this, "cannot load sound fonts file");
+ Close (p_this);
+ return VLC_EGENERIC;
+ }
+
+ aout_DateInit (&p_sys->end_date, p_dec->fmt_out.audio.i_rate);
+ aout_DateSet (&p_sys->end_date, 0);
+
+ return VLC_SUCCESS;
+}
+
+
+static void Close (vlc_object_t *p_this)
+{
+ decoder_sys_t *p_sys = ((decoder_t *)p_this)->p_sys;
+
+ if (p_sys->soundfont != -1)
+ fluid_synth_sfunload (p_sys->synth, p_sys->soundfont, 1);
+ delete_fluid_synth (p_sys->synth);
+ delete_fluid_settings (p_sys->settings);
+ free (p_sys);
+}
+
+
+static aout_buffer_t *DecodeBlock (decoder_t *p_dec, block_t **pp_block)
+{
+ block_t *p_block;
+ decoder_sys_t *p_sys = p_dec->p_sys;
+
+ if (pp_block == NULL)
+ return NULL;
+ p_block = *pp_block;
+ if (p_block == NULL)
+ return NULL;
+
+ if (p_block->i_pts && !aout_DateGet (&p_sys->end_date))
+ aout_DateSet (&p_sys->end_date, p_block->i_pts);
+ else
+ if (p_block->i_pts < aout_DateGet (&p_sys->end_date))
+ {
+ msg_Warn (p_dec, "MIDI message in the past?");
+ block_Release (p_block);
+ return NULL;
+ }
+
+ if (p_block->i_buffer < 1)
+ return NULL;
+
+ uint8_t channel = p_block->p_buffer[0] & 0xf;
+ uint8_t p1 = (p_block->i_buffer > 1) ? (p_block->p_buffer[1] & 0x7f) : 0;
+ uint8_t p2 = (p_block->i_buffer > 2) ? (p_block->p_buffer[2] & 0x7f) : 0;
+
+ switch (p_block->p_buffer[0] & 0xf0)
+ {
+ case 0x80:
+ fluid_synth_noteoff (p_sys->synth, channel, p1);
+ break;
+ case 0x90:
+ fluid_synth_noteon (p_sys->synth, channel, p1, p2);
+ break;
+ case 0xB0:
+ fluid_synth_cc (p_sys->synth, channel, p1, p2);
+ break;
+ case 0xC0:
+ fluid_synth_program_change (p_sys->synth, channel, p1);
+ break;
+ case 0xE0:
+ fluid_synth_pitch_bend (p_sys->synth, channel, (p1 << 7) | p2);
+ break;
+ }
+ p_block->p_buffer += p_block->i_buffer;
+ p_block->i_buffer = 0;
+
+ unsigned samples =
+ (p_block->i_pts - aout_DateGet (&p_sys->end_date)) * 441 / 10000;
+ if (samples == 0)
+ return NULL;
+
+ aout_buffer_t *p_out = p_dec->pf_aout_buffer_new (p_dec, samples);
+ if (p_out == NULL)
+ {
+ block_Release (p_block);
+ return NULL;
+ }
+
+ p_out->start_date = aout_DateGet (&p_sys->end_date );
+ p_out->end_date = aout_DateIncrement (&p_sys->end_date, samples);
+ fluid_synth_write_s16 (p_sys->synth, samples,
+ (int16_t *)p_out->p_buffer, 0, 2,
+ (int16_t *)p_out->p_buffer, 1, 2);
+ return p_out;
+}
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