decoder/gme: convert to C++

1 files changed, 292 insertions, 0 deletions

diff --git a/src/decoder/GmeDecoderPlugin.cxx b/src/decoder/GmeDecoderPlugin.cxx
new file mode 100644
index 000000000..6e59d4c13
--- /dev/null
+++ b/src/decoder/GmeDecoderPlugin.cxx
@@ -0,0 +1,292 @@
+/*
+ * 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 "GmeDecoderPlugin.hxx"
+#include "decoder_api.h"
+#include "audio_check.h"
+#include "tag_handler.h"
+
+extern "C" {
+#include "uri.h"
+}
+
+#include <glib.h>
+#include <assert.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <gme/gme.h>
+
+#undef G_LOG_DOMAIN
+#define G_LOG_DOMAIN "gme"
+
+#define SUBTUNE_PREFIX "tune_"
+
+static constexpr unsigned GME_SAMPLE_RATE = 44100;
+static constexpr unsigned GME_CHANNELS = 2;
+static constexpr unsigned GME_BUFFER_FRAMES = 2048;
+static constexpr unsigned GME_BUFFER_SAMPLES =
+	GME_BUFFER_FRAMES * GME_CHANNELS;
+
+/**
+ * returns the file path stripped of any /tune_xxx.* subtune
+ * suffix
+ */
+static char *
+get_container_name(const char *path_fs)
+{
+	const char *subtune_suffix = uri_get_suffix(path_fs);
+	char *path_container = g_strdup(path_fs);
+	char *pat = g_strconcat("*/" SUBTUNE_PREFIX "???.",
+				subtune_suffix, nullptr);
+	GPatternSpec *path_with_subtune = g_pattern_spec_new(pat);
+	g_free(pat);
+	if (!g_pattern_match(path_with_subtune,
+			     strlen(path_container), path_container, nullptr)) {
+		g_pattern_spec_free(path_with_subtune);
+		return path_container;
+	}
+
+	char *ptr = g_strrstr(path_container, "/" SUBTUNE_PREFIX);
+	if (ptr != nullptr)
+		*ptr='\0';
+
+	g_pattern_spec_free(path_with_subtune);
+	return path_container;
+}
+
+/**
+ * returns tune number from file.nsf/tune_xxx.* style path or 0 if no subtune
+ * is appended.
+ */
+static int
+get_song_num(const char *path_fs)
+{
+	const char *subtune_suffix = uri_get_suffix(path_fs);
+	char *pat = g_strconcat("*/" SUBTUNE_PREFIX "???.",
+				subtune_suffix, nullptr);
+	GPatternSpec *path_with_subtune = g_pattern_spec_new(pat);
+	g_free(pat);
+
+	if (g_pattern_match(path_with_subtune,
+			    strlen(path_fs), path_fs, nullptr)) {
+		char *sub = g_strrstr(path_fs, "/" SUBTUNE_PREFIX);
+		g_pattern_spec_free(path_with_subtune);
+		if (!sub)
+			return 0;
+
+		sub += strlen("/" SUBTUNE_PREFIX);
+		int song_num = strtol(sub, nullptr, 10);
+
+		return song_num - 1;
+	} else {
+		g_pattern_spec_free(path_with_subtune);
+		return 0;
+	}
+}
+
+static char *
+gme_container_scan(const char *path_fs, const unsigned int tnum)
+{
+	Music_Emu *emu;
+	const char *gme_err = gme_open_file(path_fs, &emu, GME_SAMPLE_RATE);
+	if (gme_err != nullptr) {
+		g_warning("%s", gme_err);
+		return nullptr;
+	}
+
+	const unsigned num_songs = gme_track_count(emu);
+	/* if it only contains a single tune, don't treat as container */
+	if (num_songs < 2)
+		return nullptr;
+
+	const char *subtune_suffix = uri_get_suffix(path_fs);
+	if (tnum <= num_songs){
+		char *subtune = g_strdup_printf(
+			SUBTUNE_PREFIX "%03u.%s", tnum, subtune_suffix);
+		return subtune;
+	} else
+		return nullptr;
+}
+
+static void
+gme_file_decode(struct decoder *decoder, const char *path_fs)
+{
+	char *path_container = get_container_name(path_fs);
+
+	Music_Emu *emu;
+	const char *gme_err =
+		gme_open_file(path_container, &emu, GME_SAMPLE_RATE);
+	g_free(path_container);
+	if (gme_err != nullptr) {
+		g_warning("%s", gme_err);
+		return;
+	}
+
+	gme_info_t *ti;
+	const int song_num = get_song_num(path_fs);
+	gme_err = gme_track_info(emu, &ti, song_num);
+	if (gme_err != nullptr) {
+		g_warning("%s", gme_err);
+		gme_delete(emu);
+		return;
+	}
+
+	const float song_len = ti->length > 0
+		? ti->length / 1000.0
+		: -1.0;
+
+	/* initialize the MPD decoder */
+
+	GError *error = nullptr;
+	struct audio_format audio_format;
+	if (!audio_format_init_checked(&audio_format, GME_SAMPLE_RATE,
+				       SAMPLE_FORMAT_S16, GME_CHANNELS,
+				       &error)) {
+		g_warning("%s", error->message);
+		g_error_free(error);
+		gme_free_info(ti);
+		gme_delete(emu);
+		return;
+	}
+
+	decoder_initialized(decoder, &audio_format, true, song_len);
+
+	gme_err = gme_start_track(emu, song_num);
+	if (gme_err != nullptr)
+		g_warning("%s", gme_err);
+
+	if (ti->length > 0)
+		gme_set_fade(emu, ti->length);
+
+	/* play */
+	enum decoder_command cmd;
+	do {
+		short buf[GME_BUFFER_SAMPLES];
+		gme_err = gme_play(emu, GME_BUFFER_SAMPLES, buf);
+		if (gme_err != nullptr) {
+			g_warning("%s", gme_err);
+			return;
+		}
+
+		cmd = decoder_data(decoder, nullptr, buf, sizeof(buf), 0);
+		if (cmd == DECODE_COMMAND_SEEK) {
+			float where = decoder_seek_where(decoder);
+			gme_err = gme_seek(emu, (int)where * 1000);
+			if (gme_err != nullptr)
+				g_warning("%s", gme_err);
+			decoder_command_finished(decoder);
+		}
+
+		if (gme_track_ended(emu))
+			break;
+	} while (cmd != DECODE_COMMAND_STOP);
+
+	gme_free_info(ti);
+	gme_delete(emu);
+}
+
+static bool
+gme_scan_file(const char *path_fs,
+	      const struct tag_handler *handler, void *handler_ctx)
+{
+	char *path_container = get_container_name(path_fs);
+
+	Music_Emu *emu;
+	const char *gme_err =
+		gme_open_file(path_container, &emu, GME_SAMPLE_RATE);
+	g_free(path_container);
+	if (gme_err != nullptr) {
+		g_warning("%s", gme_err);
+		return false;
+	}
+
+	const int song_num = get_song_num(path_fs);
+
+	gme_info_t *ti;
+	gme_err = gme_track_info(emu, &ti, song_num);
+	if (gme_err != nullptr) {
+		g_warning("%s", gme_err);
+		gme_delete(emu);
+		return false;
+	}
+
+	assert(ti != nullptr);
+
+	if (ti->length > 0)
+		tag_handler_invoke_duration(handler, handler_ctx,
+					    ti->length / 100);
+
+	if (ti->song != nullptr) {
+		if (gme_track_count(emu) > 1) {
+			/* start numbering subtunes from 1 */
+			char *tag_title =
+				g_strdup_printf("%s (%d/%d)",
+						ti->song, song_num + 1,
+						gme_track_count(emu));
+			tag_handler_invoke_tag(handler, handler_ctx,
+					       TAG_TITLE, tag_title);
+			g_free(tag_title);
+		} else
+			tag_handler_invoke_tag(handler, handler_ctx,
+					       TAG_TITLE, ti->song);
+	}
+
+	if (ti->author != nullptr)
+		tag_handler_invoke_tag(handler, handler_ctx,
+				       TAG_ARTIST, ti->author);
+
+	if (ti->game != nullptr)
+		tag_handler_invoke_tag(handler, handler_ctx,
+				       TAG_ALBUM, ti->game);
+
+	if (ti->comment != nullptr)
+		tag_handler_invoke_tag(handler, handler_ctx,
+				       TAG_COMMENT, ti->comment);
+
+	if (ti->copyright != nullptr)
+		tag_handler_invoke_tag(handler, handler_ctx,
+				       TAG_DATE, ti->copyright);
+
+	gme_free_info(ti);
+	gme_delete(emu);
+
+	return true;
+}
+
+static const char *const gme_suffixes[] = {
+	"ay", "gbs", "gym", "hes", "kss", "nsf",
+	"nsfe", "sap", "spc", "vgm", "vgz",
+	nullptr
+};
+
+extern const struct decoder_plugin gme_decoder_plugin;
+const struct decoder_plugin gme_decoder_plugin = {
+	"gme",
+	nullptr,
+	nullptr,
+	nullptr,
+	gme_file_decode,
+	gme_scan_file,
+	nullptr,
+	gme_container_scan,
+	gme_suffixes,
+	nullptr,
+};