aboutsummaryrefslogtreecommitdiffstats
path: root/src/decoder/plugins/GmeDecoderPlugin.cxx
blob: 469da25407930096ff35186c2018d9c8414860cd (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
/*
 * 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 "GmeDecoderPlugin.hxx"
#include "../DecoderAPI.hxx"
#include "CheckAudioFormat.hxx"
#include "tag/TagHandler.hxx"
#include "fs/Path.hxx"
#include "util/Alloc.hxx"
#include "util/FormatString.hxx"
#include "util/UriUtil.hxx"
#include "util/Error.hxx"
#include "util/Domain.hxx"
#include "Log.hxx"

#include <glib.h>
#include <assert.h>
#include <stdlib.h>
#include <string.h>

#include <gme/gme.h>

#define SUBTUNE_PREFIX "tune_"

static constexpr Domain gme_domain("gme");

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(Path path_fs)
{
	const char *subtune_suffix = uri_get_suffix(path_fs.c_str());
	char *path_container = xstrdup(path_fs.c_str());

	char pat[64];
	snprintf(pat, sizeof(pat), "%s%s",
		 "*/" SUBTUNE_PREFIX "???.",
		 subtune_suffix);
	GPatternSpec *path_with_subtune = g_pattern_spec_new(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(Path path_fs)
{
	const char *subtune_suffix = uri_get_suffix(path_fs.c_str());

	char pat[64];
	snprintf(pat, sizeof(pat), "%s%s",
		 "*/" SUBTUNE_PREFIX "???.",
		 subtune_suffix);
	GPatternSpec *path_with_subtune = g_pattern_spec_new(pat);

	if (g_pattern_match(path_with_subtune,
			    path_fs.length(), path_fs.data(), nullptr)) {
		char *sub = g_strrstr(path_fs.c_str(), "/" 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(Path path_fs, const unsigned int tnum)
{
	Music_Emu *emu;
	const char *gme_err = gme_open_file(path_fs.c_str(), &emu,
					    GME_SAMPLE_RATE);
	if (gme_err != nullptr) {
		LogWarning(gme_domain, gme_err);
		return nullptr;
	}

	const unsigned num_songs = gme_track_count(emu);
	gme_delete(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.c_str());
	if (tnum <= num_songs){
		return FormatNew(SUBTUNE_PREFIX "%03u.%s",
				 tnum, subtune_suffix);
	} else
		return nullptr;
}

static void
gme_file_decode(Decoder &decoder, Path 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);
	free(path_container);
	if (gme_err != nullptr) {
		LogWarning(gme_domain, 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) {
		LogWarning(gme_domain, gme_err);
		gme_delete(emu);
		return;
	}

	const float song_len = ti->length > 0
		? ti->length / 1000.0
		: -1.0;

	/* initialize the MPD decoder */

	Error error;
	AudioFormat audio_format;
	if (!audio_format_init_checked(audio_format, GME_SAMPLE_RATE,
				       SampleFormat::S16, GME_CHANNELS,
				       error)) {
		LogError(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)
		LogWarning(gme_domain, gme_err);

	if (ti->length > 0)
		gme_set_fade(emu, ti->length);

	/* play */
	DecoderCommand cmd;
	do {
		short buf[GME_BUFFER_SAMPLES];
		gme_err = gme_play(emu, GME_BUFFER_SAMPLES, buf);
		if (gme_err != nullptr) {
			LogWarning(gme_domain, gme_err);
			return;
		}

		cmd = decoder_data(decoder, nullptr, buf, sizeof(buf), 0);
		if (cmd == DecoderCommand::SEEK) {
			float where = decoder_seek_where(decoder);
			gme_err = gme_seek(emu, int(where * 1000));
			if (gme_err != nullptr)
				LogWarning(gme_domain, gme_err);
			decoder_command_finished(decoder);
		}

		if (gme_track_ended(emu))
			break;
	} while (cmd != DecoderCommand::STOP);

	gme_free_info(ti);
	gme_delete(emu);
}

static bool
gme_scan_file(Path 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);
	free(path_container);
	if (gme_err != nullptr) {
		LogWarning(gme_domain, 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) {
		LogWarning(gme_domain, 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[1024];
			snprintf(tag_title, sizeof(tag_title),
				 "%s (%d/%d)",
				 ti->song, song_num + 1,
				 gme_track_count(emu));
			tag_handler_invoke_tag(handler, handler_ctx,
					       TAG_TITLE, 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 DecoderPlugin gme_decoder_plugin;
const struct DecoderPlugin gme_decoder_plugin = {
	"gme",
	nullptr,
	nullptr,
	nullptr,
	gme_file_decode,
	gme_scan_file,
	nullptr,
	gme_container_scan,
	gme_suffixes,
	nullptr,
};