decoder/fluidsynth: convert to C++

src/decoder/FluidsynthDecoderPlugin.cxx

@@ -0,0 +1,226 @@
+/*
+ * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * 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 "config.h"
+#include "FluidsynthDecoderPlugin.hxx"
+#include "decoder_api.h"
+#include "audio_check.h"
+#include "conf.h"
+
+#include <glib.h>
+
+#include <fluidsynth.h>
+
+#undef G_LOG_DOMAIN
+#define G_LOG_DOMAIN "fluidsynth"
+
+static unsigned sample_rate;
+static const char *soundfont_path;
+
+/**
+ * Convert a fluidsynth log level to a GLib log level.
+ */
+static GLogLevelFlags
+fluidsynth_level_to_glib(enum fluid_log_level level)
+{
+	switch (level) {
+	case FLUID_PANIC:
+	case FLUID_ERR:
+		return G_LOG_LEVEL_CRITICAL;
+
+	case FLUID_WARN:
+		return G_LOG_LEVEL_WARNING;
+
+	case FLUID_INFO:
+		return G_LOG_LEVEL_INFO;
+
+	case FLUID_DBG:
+	case LAST_LOG_LEVEL:
+		return G_LOG_LEVEL_DEBUG;
+	}
+
+	/* invalid fluidsynth log level */
+	return G_LOG_LEVEL_MESSAGE;
+}
+
+/**
+ * The fluidsynth logging callback.  It forwards messages to the GLib
+ * logging library.
+ */
+static void
+fluidsynth_mpd_log_function(int level, char *message, G_GNUC_UNUSED void *data)
+{
+	g_log(G_LOG_DOMAIN, fluidsynth_level_to_glib(fluid_log_level(level)),
+	      "%s", message);
+}
+
+static bool
+fluidsynth_init(const struct config_param *param)
+{
+	GError *error = nullptr;
+
+	sample_rate = config_get_block_unsigned(param, "sample_rate", 48000);
+	if (!audio_check_sample_rate(sample_rate, &error)) {
+		g_warning("%s\n", error->message);
+		g_error_free(error);
+		return false;
+	}
+
+	soundfont_path =
+		config_get_block_string(param, "soundfont",
+					"/usr/share/sounds/sf2/FluidR3_GM.sf2");
+
+	fluid_set_log_function(LAST_LOG_LEVEL,
+			       fluidsynth_mpd_log_function, nullptr);
+
+	return true;
+}
+
+static void
+fluidsynth_file_decode(struct decoder *decoder, const char *path_fs)
+{
+	char setting_sample_rate[] = "synth.sample-rate";
+	/*
+	char setting_verbose[] = "synth.verbose";
+	char setting_yes[] = "yes";
+	*/
+	fluid_settings_t *settings;
+	fluid_synth_t *synth;
+	fluid_player_t *player;
+	int ret;
+	enum decoder_command cmd;
+
+	/* set up fluid settings */
+
+	settings = new_fluid_settings();
+	if (settings == nullptr)
+		return;
+
+	fluid_settings_setnum(settings, setting_sample_rate, sample_rate);
+
+	/*
+	fluid_settings_setstr(settings, setting_verbose, setting_yes);
+	*/
+
+	/* create the fluid synth */
+
+	synth = new_fluid_synth(settings);
+	if (synth == nullptr) {
+		delete_fluid_settings(settings);
+		return;
+	}
+
+	ret = fluid_synth_sfload(synth, soundfont_path, true);
+	if (ret < 0) {
+		g_warning("fluid_synth_sfload() failed");
+		delete_fluid_synth(synth);
+		delete_fluid_settings(settings);
+		return;
+	}
+
+	/* create the fluid player */
+
+	player = new_fluid_player(synth);
+	if (player == nullptr) {
+		delete_fluid_synth(synth);
+		delete_fluid_settings(settings);
+		return;
+	}
+
+	ret = fluid_player_add(player, path_fs);
+	if (ret != 0) {
+		g_warning("fluid_player_add() failed");
+		delete_fluid_player(player);
+		delete_fluid_synth(synth);
+		delete_fluid_settings(settings);
+		return;
+	}
+
+	/* start the player */
+
+	ret = fluid_player_play(player);
+	if (ret != 0) {
+		g_warning("fluid_player_play() failed");
+		delete_fluid_player(player);
+		delete_fluid_synth(synth);
+		delete_fluid_settings(settings);
+		return;
+	}
+
+	/* initialization complete - announce the audio format to the
+	   MPD core */
+
+	struct audio_format audio_format;
+	audio_format_init(&audio_format, sample_rate, SAMPLE_FORMAT_S16, 2);
+	decoder_initialized(decoder, &audio_format, false, -1);
+
+	while (fluid_player_get_status(player) == FLUID_PLAYER_PLAYING) {
+		int16_t buffer[2048];
+		const unsigned max_frames = G_N_ELEMENTS(buffer) / 2;
+
+		/* read samples from fluidsynth and send them to the
+		   MPD core */
+
+		ret = fluid_synth_write_s16(synth, max_frames,
+					    buffer, 0, 2,
+					    buffer, 1, 2);
+		if (ret != 0)
+			break;
+
+		cmd = decoder_data(decoder, nullptr, buffer, sizeof(buffer),
+				   0);
+		if (cmd != DECODE_COMMAND_NONE)
+			break;
+	}
+
+	/* clean up */
+
+	fluid_player_stop(player);
+	fluid_player_join(player);
+
+	delete_fluid_player(player);
+	delete_fluid_synth(synth);
+	delete_fluid_settings(settings);
+}
+
+static bool
+fluidsynth_scan_file(const char *file,
+		     G_GNUC_UNUSED const struct tag_handler *handler,
+		     G_GNUC_UNUSED void *handler_ctx)
+{
+	return fluid_is_midifile(file);
+}
+
+static const char *const fluidsynth_suffixes[] = {
+	"mid",
+	nullptr
+};
+
+const struct decoder_plugin fluidsynth_decoder_plugin = {
+	"fluidsynth",
+	fluidsynth_init,
+	nullptr,
+	nullptr,
+	fluidsynth_file_decode,
+	fluidsynth_scan_file,
+	nullptr,
+	nullptr,
+	fluidsynth_suffixes,
+	nullptr,
+};