decoder/*: move to decoder/plugins/

src/decoder/plugins/ModplugDecoderPlugin.cxx

@@ -0,0 +1,215 @@
+/*
+ * 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 "ModplugDecoderPlugin.hxx"
+#include "../DecoderAPI.hxx"
+#include "InputStream.hxx"
+#include "tag/TagHandler.hxx"
+#include "system/FatalError.hxx"
+#include "util/WritableBuffer.hxx"
+#include "util/Domain.hxx"
+#include "Log.hxx"
+
+#include <libmodplug/modplug.h>
+
+
+#include <assert.h>
+
+static constexpr Domain modplug_domain("modplug");
+
+static constexpr size_t MODPLUG_FRAME_SIZE = 4096;
+static constexpr size_t MODPLUG_PREALLOC_BLOCK = 256 * 1024;
+static constexpr InputStream::offset_type MODPLUG_FILE_LIMIT = 100 * 1024 * 1024;
+
+static int modplug_loop_count;
+
+static bool
+modplug_decoder_init(const config_param &param)
+{
+	modplug_loop_count = param.GetBlockValue("loop_count", 0);
+	if (modplug_loop_count < -1)
+		FormatFatalError("Invalid loop count in line %d: %i",
+				 param.line, modplug_loop_count);
+
+	return true;
+}
+
+static WritableBuffer<uint8_t>
+mod_loadfile(Decoder *decoder, InputStream &is)
+{
+	const InputStream::offset_type size = is.GetSize();
+
+	if (size == 0) {
+		LogWarning(modplug_domain, "file is empty");
+		return { nullptr, 0 };
+	}
+
+	if (size > MODPLUG_FILE_LIMIT) {
+		LogWarning(modplug_domain, "file too large");
+		return { nullptr, 0 };
+	}
+
+	//known/unknown size, preallocate array, lets read in chunks
+
+	const bool is_stream = size < 0;
+
+	WritableBuffer<uint8_t> buffer;
+	buffer.size = is_stream ? MODPLUG_PREALLOC_BLOCK : size;
+	buffer.data = new uint8_t[buffer.size];
+
+	uint8_t *const end = buffer.end();
+	uint8_t *p = buffer.begin();
+
+	while (true) {
+		size_t ret = decoder_read(decoder, is, p, end - p);
+		if (ret == 0) {
+			if (is.LockIsEOF())
+				/* end of file */
+				break;
+
+			/* I/O error - skip this song */
+			delete[] buffer.data;
+			buffer.data = nullptr;
+			return buffer;
+		}
+
+		p += ret;
+		if (p == end) {
+			if (!is_stream)
+				break;
+
+			LogWarning(modplug_domain, "stream too large");
+			delete[] buffer.data;
+			buffer.data = nullptr;
+			return buffer;
+		}
+	}
+
+	buffer.size = p - buffer.data;
+	return buffer;
+}
+
+static ModPlugFile *
+LoadModPlugFile(Decoder *decoder, InputStream &is)
+{
+	const auto buffer = mod_loadfile(decoder, is);
+	if (buffer.IsNull()) {
+		LogWarning(modplug_domain, "could not load stream");
+		return nullptr;
+	}
+
+	ModPlugFile *f = ModPlug_Load(buffer.data, buffer.size);
+	delete[] buffer.data;
+	return f;
+}
+
+static void
+mod_decode(Decoder &decoder, InputStream &is)
+{
+	ModPlug_Settings settings;
+	int ret;
+	char audio_buffer[MODPLUG_FRAME_SIZE];
+
+	ModPlug_GetSettings(&settings);
+	/* alter setting */
+	settings.mResamplingMode = MODPLUG_RESAMPLE_FIR; /* RESAMP */
+	settings.mChannels = 2;
+	settings.mBits = 16;
+	settings.mFrequency = 44100;
+	settings.mLoopCount = modplug_loop_count;
+	/* insert more setting changes here */
+	ModPlug_SetSettings(&settings);
+
+	ModPlugFile *f = LoadModPlugFile(&decoder, is);
+	if (f == nullptr) {
+		LogWarning(modplug_domain, "could not decode stream");
+		return;
+	}
+
+	static constexpr AudioFormat audio_format(44100, SampleFormat::S16, 2);
+	assert(audio_format.IsValid());
+
+	decoder_initialized(decoder, audio_format,
+			    is.IsSeekable(),
+			    ModPlug_GetLength(f) / 1000.0);
+
+	DecoderCommand cmd;
+	do {
+		ret = ModPlug_Read(f, audio_buffer, MODPLUG_FRAME_SIZE);
+		if (ret <= 0)
+			break;
+
+		cmd = decoder_data(decoder, nullptr,
+				   audio_buffer, ret,
+				   0);
+
+		if (cmd == DecoderCommand::SEEK) {
+			float where = decoder_seek_where(decoder);
+
+			ModPlug_Seek(f, (int)(where * 1000.0));
+
+			decoder_command_finished(decoder);
+		}
+
+	} while (cmd != DecoderCommand::STOP);
+
+	ModPlug_Unload(f);
+}
+
+static bool
+modplug_scan_stream(InputStream &is,
+		    const struct tag_handler *handler, void *handler_ctx)
+{
+	ModPlugFile *f = LoadModPlugFile(nullptr, is);
+	if (f == nullptr)
+		return false;
+
+	tag_handler_invoke_duration(handler, handler_ctx,
+				    ModPlug_GetLength(f) / 1000);
+
+	const char *title = ModPlug_GetName(f);
+	if (title != nullptr)
+		tag_handler_invoke_tag(handler, handler_ctx,
+				       TAG_TITLE, title);
+
+	ModPlug_Unload(f);
+
+	return true;
+}
+
+static const char *const mod_suffixes[] = {
+	"669", "amf", "ams", "dbm", "dfm", "dsm", "far", "it",
+	"med", "mdl", "mod", "mtm", "mt2", "okt", "s3m", "stm",
+	"ult", "umx", "xm",
+	nullptr
+};
+
+const struct DecoderPlugin modplug_decoder_plugin = {
+	"modplug",
+	modplug_decoder_init,
+	nullptr,
+	mod_decode,
+	nullptr,
+	nullptr,
+	modplug_scan_stream,
+	nullptr,
+	mod_suffixes,
+	nullptr,
+};