decoder/*: move to decoder/plugins/

src/decoder/plugins/WildmidiDecoderPlugin.cxx

@@ -0,0 +1,158 @@
+/*
+ * Copyright (C) 2003-2014 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 "WildmidiDecoderPlugin.hxx"
+#include "../DecoderAPI.hxx"
+#include "tag/TagHandler.hxx"
+#include "util/Error.hxx"
+#include "util/Domain.hxx"
+#include "fs/AllocatedPath.hxx"
+#include "fs/FileSystem.hxx"
+#include "system/FatalError.hxx"
+#include "Log.hxx"
+
+extern "C" {
+#include <wildmidi_lib.h>
+}
+
+static constexpr Domain wildmidi_domain("wildmidi");
+
+static constexpr unsigned WILDMIDI_SAMPLE_RATE = 48000;
+
+static bool
+wildmidi_init(const config_param &param)
+{
+	Error error;
+	const AllocatedPath path =
+		param.GetBlockPath("config_file",
+				   "/etc/timidity/timidity.cfg",
+				   error);
+	if (path.IsNull())
+		FatalError(error);
+
+	if (!FileExists(path)) {
+		const auto utf8 = path.ToUTF8();
+		FormatDebug(wildmidi_domain,
+			    "configuration file does not exist: %s",
+			    utf8.c_str());
+		return false;
+	}
+
+	return WildMidi_Init(path.c_str(), WILDMIDI_SAMPLE_RATE, 0) == 0;
+}
+
+static void
+wildmidi_finish(void)
+{
+	WildMidi_Shutdown();
+}
+
+static void
+wildmidi_file_decode(Decoder &decoder, const char *path_fs)
+{
+	static constexpr AudioFormat audio_format = {
+		WILDMIDI_SAMPLE_RATE,
+		SampleFormat::S16,
+		2,
+	};
+	midi *wm;
+	const struct _WM_Info *info;
+
+	wm = WildMidi_Open(path_fs);
+	if (wm == nullptr)
+		return;
+
+	info = WildMidi_GetInfo(wm);
+	if (info == nullptr) {
+		WildMidi_Close(wm);
+		return;
+	}
+
+	decoder_initialized(decoder, audio_format, true,
+			    info->approx_total_samples / WILDMIDI_SAMPLE_RATE);
+
+	DecoderCommand cmd;
+	do {
+		char buffer[4096];
+		int len;
+
+		info = WildMidi_GetInfo(wm);
+		if (info == nullptr)
+			break;
+
+		len = WildMidi_GetOutput(wm, buffer, sizeof(buffer));
+		if (len <= 0)
+			break;
+
+		cmd = decoder_data(decoder, nullptr, buffer, len, 0);
+
+		if (cmd == DecoderCommand::SEEK) {
+			unsigned long seek_where = WILDMIDI_SAMPLE_RATE *
+				decoder_seek_where(decoder);
+
+			WildMidi_FastSeek(wm, &seek_where);
+			decoder_command_finished(decoder);
+			cmd = DecoderCommand::NONE;
+		}
+
+	} while (cmd == DecoderCommand::NONE);
+
+	WildMidi_Close(wm);
+}
+
+static bool
+wildmidi_scan_file(const char *path_fs,
+		   const struct tag_handler *handler, void *handler_ctx)
+{
+	midi *wm = WildMidi_Open(path_fs);
+	if (wm == nullptr)
+		return false;
+
+	const struct _WM_Info *info = WildMidi_GetInfo(wm);
+	if (info == nullptr) {
+		WildMidi_Close(wm);
+		return false;
+	}
+
+	int duration = info->approx_total_samples / WILDMIDI_SAMPLE_RATE;
+	tag_handler_invoke_duration(handler, handler_ctx, duration);
+
+	WildMidi_Close(wm);
+
+	return true;
+}
+
+static const char *const wildmidi_suffixes[] = {
+	"mid",
+	nullptr
+};
+
+const struct DecoderPlugin wildmidi_decoder_plugin = {
+	"wildmidi",
+	wildmidi_init,
+	wildmidi_finish,
+	nullptr,
+	wildmidi_file_decode,
+	wildmidi_scan_file,
+	nullptr,
+	nullptr,
+	wildmidi_suffixes,
+	nullptr,
+};