aboutsummaryrefslogtreecommitdiff
path: root/sound/mp3.cpp
blob: 4c9f238eedfbce92227cf6f38ca054767c59fb33 (plain)
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
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
/* ScummVM - Scumm Interpreter
 * Copyright (C) 2003-2005 The ScummVM project
 *
 * 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * $Header$
 *
 */

#include "sound/mp3.h"

#ifdef USE_MAD

#include "common/file.h"
#include "common/util.h"

#include "sound/audiocd.h"
#include "sound/audiostream.h"

#include <mad.h>


using Common::File;


#pragma mark -
#pragma mark --- MP3 (MAD) stream ---
#pragma mark -


class MP3InputStream : public AudioStream {
	struct mad_stream _stream;
	struct mad_frame _frame;
	struct mad_synth _synth;
	mad_timer_t _duration;
	uint32 _posInFrame;
	uint32 _bufferSize;
	int _size;
	bool _isStereo;
	int _curChannel;
	File *_file;
	byte *_ptr;

	bool init();
	void refill(bool first = false);
	inline bool eosIntern() const;
public:
	MP3InputStream(File *file, mad_timer_t duration);
	MP3InputStream(File *file, uint32 size);
	~MP3InputStream();
	int readBuffer(int16 *buffer, const int numSamples);

	bool endOfData() const		{ return eosIntern(); }
	bool isStereo() const		{ return _isStereo; }

	int getRate() const			{ return _frame.header.samplerate; }
#ifdef __SYMBIAN32__
	// Used to store the last position stream was read for symbian
	int _lastReadPosition;
#endif
};


/**
 * Play the MP3 data in the given file for the specified duration.
 *
 * @param file		file containing the MP3 data
 * @param duration	playback duration in frames (1/75th of a second), 0 means
 *					playback until EOF
 */
MP3InputStream::MP3InputStream(File *file, mad_timer_t duration) {
	// duration == 0 means: play everything till end of file

	mad_stream_init(&_stream);
	mad_frame_init(&_frame);
	mad_synth_init(&_synth);

	_duration = duration;

#if defined(__SYMBIAN32__)
	// Symbian can't share filehandles between different threads.
	// So create a new file  and seek that to the other filehandles position
	_file= new (ELeave)File;
	_file->open(file->name());
	_file->seek(file->pos());
#else
	_file = file;
#endif

	_posInFrame = 0;
	_bufferSize = 128 * 1024;	// Default buffer size is 128K

	init();
	_file->incRef();
}

/**
 * Play the MP3 data in the given file, using at most the given number of bytes.
 *
 * @param file		file containing the MP3 data
 * @param size		limits playback based on the number of input bytes, 0 means
 *					playback until EOF
 */
MP3InputStream::MP3InputStream(File *file, uint32 size) {
	mad_stream_init(&_stream);
	mad_frame_init(&_frame);
	mad_synth_init(&_synth);

	_duration = mad_timer_zero;

#if defined(__SYMBIAN32__)
	// Symbian can't share filehandles between different threads.
	// So create a new file  and seek that to the other filehandles position
	_file= new (ELeave)File;
	_file->open(file->name());
	_file->seek(file->pos());
#else
	_file = file;
#endif

	_posInFrame = 0;
	_bufferSize = size ? size : (128 * 1024);	// Default buffer size is 128K

	init();

	// If a size is specified, we do not perform any further read operations
	if (size) {
#ifdef __SYMBIAN32__
		 delete _file;
#endif
		_file = 0;
	} else {
		_file->incRef();
	}
}

MP3InputStream::~MP3InputStream() {
	mad_synth_finish(&_synth);
	mad_frame_finish(&_frame);
	mad_stream_finish(&_stream);

	free(_ptr);

	if (_file)
		_file->decRef();
#ifdef __SYMBIAN32__
	delete _file;
#endif
}

bool MP3InputStream::init() {
	_isStereo = false;
	_curChannel = 0;
	_ptr = (byte *)malloc(_bufferSize + MAD_BUFFER_GUARD);

	// Read in the first chunk of the MP3 file
	_size = _file->read(_ptr, _bufferSize);
	if (_size <= 0) {
		warning("MP3InputStream: Failed to read MP3 data");
		return false;
	}

	// Feed the data we just read into the stream decoder
	mad_stream_buffer(&_stream, _ptr, _size);

	// Read in initial data
	refill(true);

	// Check the header, determine if this is a stereo stream
	int num;
	switch(_frame.header.mode) {
		case MAD_MODE_SINGLE_CHANNEL:
		case MAD_MODE_DUAL_CHANNEL:
		case MAD_MODE_JOINT_STEREO:
		case MAD_MODE_STEREO:
			num = MAD_NCHANNELS(&_frame.header);
			assert(num == 1 || num == 2);
			_isStereo = (num == 2);
			break;
		default:
			warning("MP3InputStream: Cannot determine number of channels");
			return false;
	}

	return true;
}

void MP3InputStream::refill(bool first) {

	// Read the next frame (may have to retry several times, e.g.
	// to skip over ID3 information).
	// must reopen file at current position
#ifdef __SYMBIAN32__
	// For symbian we must check that an alternative file pointer is created, see if its open
	// If not re-open file and seek to the last read position
	if(_file && !_file->isOpen()){
		_file->open(_file->name());
		_file->seek(_lastReadPosition);
	}
#endif

	while (mad_frame_decode(&_frame, &_stream)) {
		if (_stream.error == MAD_ERROR_BUFLEN) {
			int offset;

			if (!_file)
				_size = -1;

			// Give up immediately if we are at the EOF already
			if (_size <= 0)
				return;

			if (!_stream.next_frame) {
				offset = 0;
				memset(_ptr, 0, _bufferSize + MAD_BUFFER_GUARD);
			} else {
				offset = _stream.bufend - _stream.next_frame;
				memcpy(_ptr, _stream.next_frame, offset);
			}
			// Read in more data from the input file
			_size = _file->read(_ptr + offset, _bufferSize - offset);

			// Nothing read -> EOF -> bail out
			if (_size <= 0) {
				return;
			}
			_stream.error = (enum mad_error)0;

			// Feed the data we just read into the stream decoder
			mad_stream_buffer(&_stream, _ptr, _size + offset);

		} else if (MAD_RECOVERABLE(_stream.error)) {
			// FIXME: should we do anything here?
			debug(6, "MP3InputStream: Recoverable error...");
		} else {
			error("MP3InputStream: Unrecoverable error");
		}
	}

	// If a time limit was specified (i.e. if _duration is non-zero),
	// check the play back time to determine whether we have to stop now.
	if (_file && mad_timer_compare(_duration, mad_timer_zero) > 0) {
		// Subtract the duration of this frame from the time left to play
		mad_timer_t frame_duration = _frame.header.duration;
		mad_timer_negate(&frame_duration);
		mad_timer_add(&_duration, frame_duration);

		if (!first && mad_timer_compare(_duration, mad_timer_zero) <= 0)
			_size = -1;	// Mark for EOF
	}

	// Synthesise the frame into PCM samples and reset the buffer position
	mad_synth_frame(&_synth, &_frame);
	_posInFrame = 0;

#ifdef __SYMBIAN32__
	// For symbian we now store the last read position and then close the file
	if(_file){
		_lastReadPosition=_file->pos();
		_file->close();
		}
#endif
}

inline bool MP3InputStream::eosIntern() const {
	return (_size < 0 || _posInFrame >= _synth.pcm.length);
}

static inline int scale_sample(mad_fixed_t sample) {
	// round
	sample += (1L << (MAD_F_FRACBITS - 16));

	// clip
	if (sample > MAD_F_ONE - 1)
		sample = MAD_F_ONE - 1;
	else if (sample < -MAD_F_ONE)
		sample = -MAD_F_ONE;

	// quantize and scale to not saturate when mixing a lot of channels
	return sample >> (MAD_F_FRACBITS + 1 - 16);
}

int MP3InputStream::readBuffer(int16 *buffer, const int numSamples) {
	int samples = 0;
	assert(_curChannel == 0);	// Paranoia check
	while (samples < numSamples && !eosIntern()) {
		const int len = MIN(numSamples, samples + (int)(_synth.pcm.length - _posInFrame) * (_isStereo ? 2 : 1));
		while (samples < len) {
			*buffer++ = (int16)scale_sample(_synth.pcm.samples[0][_posInFrame]);
			samples++;
			if (_isStereo) {
				*buffer++ = (int16)scale_sample(_synth.pcm.samples[1][_posInFrame]);
				samples++;
			}
			_posInFrame++;
		}
		if (_posInFrame >= _synth.pcm.length) {
			refill();
		}
	}
	return samples;
}

AudioStream *makeMP3Stream(File *file, uint32 size) {
	return new MP3InputStream(file, size);
}


#pragma mark -
#pragma mark --- MP3 Audio CD emulation ---
#pragma mark -


class MP3TrackInfo : public DigitalTrackInfo {
private:
	struct mad_header _mad_header;
	long _size;
	File *_file;
	bool _error_flag;

public:
	MP3TrackInfo(File *file);
	~MP3TrackInfo();
	bool error() { return _error_flag; }
	void play(Audio::Mixer *mixer, Audio::SoundHandle *handle, int startFrame, int duration);
};


MP3TrackInfo::MP3TrackInfo(File *file) {
#ifdef __SYMBIAN32__
	// This data is taking a rather big room on symbians limited stack
	// Create the buffers on the heap instead and let the stream and frame be references instead
	struct mad_stream* streamptr = (struct mad_stream*)malloc(sizeof(struct mad_stream));
	struct mad_frame* frameptr = (struct mad_frame*)malloc(sizeof(struct mad_frame));
	unsigned char* bufferptr = (unsigned char*)malloc(8192);

	struct mad_stream& stream = *streamptr;
	struct mad_frame& frame = *frameptr;
	unsigned char* buffer = bufferptr;
	uint sizeofbuffer = 8192;
#else
	struct mad_stream stream;
	struct mad_frame frame;
	unsigned char buffer[8192];
	uint sizeofbuffer = sizeof(buffer);
#endif
	unsigned int buflen = 0;
	int count = 0;

	// Check the format and bitrate
	mad_stream_init(&stream);
	mad_frame_init(&frame);

	while (1) {
		if (buflen < sizeofbuffer) {
			int bytes;

			bytes = file->read(buffer + buflen, sizeofbuffer - buflen);
			if (bytes <= 0) {
				if (bytes == -1) {
					warning("Invalid file format");
					goto error;
				}
				break;
			}

			buflen += bytes;
		}

		mad_stream_buffer(&stream, buffer, buflen);

		while (1) {
			if (mad_frame_decode(&frame, &stream) == -1) {
				if (!MAD_RECOVERABLE(stream.error))
					break;

				if (stream.error != MAD_ERROR_BADCRC)
					continue;
			}

			if (count++)
				break;
		}

		if (count || stream.error != MAD_ERROR_BUFLEN)
			break;

		memmove(buffer, stream.next_frame,
		        buflen = &buffer[buflen] - stream.next_frame);
	}

	if (count)
		memcpy(&_mad_header, &frame.header, sizeof(mad_header));
	else {
		warning("Invalid file format");
		goto error;
	}

	mad_frame_finish(&frame);
	mad_stream_finish(&stream);
	// Get file size
	_size = file->size();
	_file = file;
	_error_flag = false;
#ifdef __SYMBIAN32__
	// Free the heap reservations
	free(frameptr);
	free(streamptr);
	free(bufferptr);
#endif
	return;

error:
	mad_frame_finish(&frame);
	mad_stream_finish(&stream);
	_error_flag = true;
	delete file;
#ifdef __SYMBIAN32__
	// Free the heap reservations
	free(frameptr);
	free(streamptr);
	free(bufferptr);
#endif
}

void MP3TrackInfo::play(Audio::Mixer *mixer, Audio::SoundHandle *handle, int startFrame, int duration) {
	unsigned int offset;
	mad_timer_t durationTime;

	// Calc offset. As all bitrates are in kilobit per seconds, the division by 200 is always exact
	offset = (startFrame * (_mad_header.bitrate / (8 * 25))) / 3;
#ifdef __SYMBIAN32__
	// Reopen the file if it is not open yet
	if(!_file->isOpen())
		_file->open(_file->name());
#endif
	_file->seek(offset, SEEK_SET);

	// Calc delay
	if (!duration) {
		// FIXME: Using _size here is a problem if offset (or equivalently
		// startFrame) is non-zero.
		mad_timer_set(&durationTime, (_size * 8) / _mad_header.bitrate,
					(_size * 8) % _mad_header.bitrate, _mad_header.bitrate);
	} else {
		mad_timer_set(&durationTime, duration / 75, duration % 75, 75);
	}

	// Play it
	AudioStream *input = new MP3InputStream(_file, durationTime);
	mixer->playInputStream(Audio::Mixer::kMusicSoundType, handle, input);
}

MP3TrackInfo::~MP3TrackInfo() {
	if (! _error_flag)
		_file->close();
}

DigitalTrackInfo *getMP3Track(int track) {
	char track_name[32];
	File *file = new File();

	sprintf(track_name, "track%d.mp3", track);
	file->open(track_name);

	if (file->isOpen()) {
		MP3TrackInfo *trackInfo = new MP3TrackInfo(file);
		if (!trackInfo->error())
			return trackInfo;
		delete trackInfo;
	}
	delete file;
	return NULL;
}


#endif