aboutsummaryrefslogtreecommitdiff
path: root/backends/platform/ds/arm9/source/cdaudio.cpp
blob: 3a012fc01aba4995a64feb4c97cefac51a0e6a4e (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
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * 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.
 *
 */
 
#include "stdafx.h"
#include "cdaudio.h"
#include "ds-fs.h"
#include "config-manager.h"
#include "dsmain.h"
#include "NDS/scummvm_ipc.h"
#include "console2.h"

#define WAV_FORMAT_IMA_ADPCM 0x14
#define BUFFER_SIZE 8192
#define BUFFER_CHUNK_SIZE (BUFFER_SIZE >> 2)

namespace DS {
namespace CD {

struct WaveHeader {

	char		riff[4];		// 'RIFF'
	u32			size;			// Size of the file
	char		wave[4];		// 'WAVE'

	// fmt chunk
	char		fmt[4];			// 'fmt '
	u32			fmtSize;		// Chunk size
	u16			fmtFormatTag;	// Format of this file
	u16			fmtChannels;	// Num channels
	u32			fmtSamPerSec;	// Samples per second
	u32			fmtBytesPerSec; // Bytes per second
	u16			fmtBlockAlign;	// Block alignment
	u16			fmtBitsPerSam;	// Bits per sample

	u16			fmtExtraData;	// Number of extra fmt bytes
	u16			fmtExtra;		// Samples per block (only for IMA-ADPCM files)
} __attribute__ ((packed));
	
struct chunkHeader {
	char 		name[4];	
	u32			size;
} __attribute__ ((packed));

struct Header {
	s16 		firstSample;
	char		stepTableIndex;
	char		reserved;
} __attribute__ ((packed));

struct decoderFormat {
	s16 initial;
	unsigned char tableIndex;
	unsigned char test;
	unsigned char	sample[1024];
} __attribute__ ((packed));

bool active = false;
WaveHeader waveHeader;
Header blockHeader;
FILE* file;
int fillPos;
bool isPlayingFlag = false;

s16* audioBuffer;
u32 sampleNum;
s16* decompressionBuffer;
int numLoops;
int blockCount;
int dataChunkStart;
int blocksLeft;
bool trackStartsAt2 = false;


// These are from Microsoft's document on DVI ADPCM
const int stepTab[ 89 ] = {
7, 8, 9, 10, 11, 12, 13, 14,
16, 17, 19, 21, 23, 25, 28, 31,
34, 37, 41, 45, 50, 55, 60, 66,
73, 80, 88, 97, 107, 118, 130, 143,
157, 173, 190, 209, 230, 253, 279, 307,
337, 371, 408, 449, 494, 544, 598, 658,
724, 796, 876, 963, 1060, 1166, 1282, 1411,
1552, 1707, 1878, 2066, 2272, 2499, 2749, 3024,
3327, 3660, 4026, 4428, 4871, 5358, 5894, 6484,
7132, 7845, 8630, 9493, 10442, 11487, 12635, 13899,
15289, 16818, 18500, 20350, 22385, 24623, 27086, 29794,
32767 };

const int indexTab[ 16 ] = { -1, -1, -1, -1, 2, 4, 6, 8,
-1, -1, -1, -1, 2, 4, 6, 8 };

void playNextBlock();
void decompressBlock();


void allocBuffers() {
	
}

void setActive(bool active) {
	DS::CD::active = active;
}

bool getActive() {
	return active;
}

void playTrack(int track, int numLoops, int startFrame, int duration) {
	Common::String path = ConfMan.get("path");
	
	if (isPlayingFlag) {
		stopTrack();
	}
	
	if (trackStartsAt2) {
		track++;
	}
	
	
	
	char str[100];

	if (path[strlen(path.c_str()) - 1] == '/') {
		sprintf(str, "track%d.wav", track);
		path = path + str;
	} else {
		sprintf(str, "/track%d.wav", track);
		path = path + str;
	}
	
	
	//1820160
	
	file = DS::std_fopen(path.c_str(), "rb");
	
	if (!file) {
		consolePrintf("Failed to open %s!\n", path.c_str());
		return;
	}
	
	
	DS::std_fread((const void *) &waveHeader, sizeof(waveHeader), 1, file);
	
	consolePrintf("Playing track %d\n", track);
	consolePrintf("Format: %d\n", waveHeader.fmtFormatTag);
	consolePrintf("Rate  : %d\n", waveHeader.fmtSamPerSec);
	consolePrintf("Bits  : %d\n", waveHeader.fmtBitsPerSam);
	consolePrintf("BlkSz : %d\n", waveHeader.fmtExtra);
	
	if ((waveHeader.fmtFormatTag != 17) && (waveHeader.fmtFormatTag != 20)) {
		consolePrintf("Wave file is in the wrong format!  You must use IMA-ADPCM 4-bit mono.\n");
		return;
	}
	
	for (int r = 0; r < 8; r++) {
		IPC->adpcm.buffer[r] = (u8 * volatile) (decoderFormat *) malloc(waveHeader.fmtBlockAlign);
		IPC->adpcm.filled[r] = false;
		IPC->adpcm.arm7Dirty[r] = false;
	}
	
	// Skip chunks until we reach the data chunk
	chunkHeader chunk;
	DS::std_fread((const void *) &chunk, sizeof(chunkHeader), 1, file);
	
	while (!((chunk.name[0] == 'd') && (chunk.name[1] == 'a') && (chunk.name[2] == 't') && (chunk.name[3] == 'a'))) {
		DS::std_fseek(file, chunk.size, SEEK_CUR);
		DS::std_fread((const void *) &chunk, sizeof(chunkHeader), 1, file);
	}
	
	dataChunkStart = DS::std_ftell(file);
	
	
	static bool started = false;
	sampleNum = 0;
	blockCount = 0;

	IPC->streamFillNeeded[0] = true;
	IPC->streamFillNeeded[1] = true;
	IPC->streamFillNeeded[2] = true;
	IPC->streamFillNeeded[3] = true;
	if (!started) {
		fillPos = 0;
		audioBuffer = (s16 *) malloc(BUFFER_SIZE * 2);
		decompressionBuffer = (s16 *) malloc(waveHeader.fmtExtra * 2);
		started = true;
//		consolePrintf("****Starting buffer*****\n");
		memset(audioBuffer, 0, BUFFER_SIZE * 2);
		memset(decompressionBuffer, 0, waveHeader.fmtExtra * 2);
		DS::playSound(audioBuffer, BUFFER_SIZE * 2, false, false, waveHeader.fmtSamPerSec);
		
	}	
	fillPos = (IPC->streamPlayingSection + 1) & 3;
	isPlayingFlag = true;
	
	
	// Startframe is a 75Hz timer.  Dunno why, since nothing else
	// seems to run at that rate.
	int tenths = (startFrame * 10) / 75;
	
	// Seek to the nearest block start to the start time
	int samples = (tenths * waveHeader.fmtSamPerSec) / 10;
	int block = samples / waveHeader.fmtExtra;
	
	
	if (duration == 0) {
		blocksLeft = 0;
	} else {
		blocksLeft = ((((duration * 100) / 75) * (waveHeader.fmtSamPerSec)) / (waveHeader.fmtExtra) / 100) + 10;
	}
//	consolePrintf("Playing %d blocks (%d)\n\n", blocksLeft, duration);
	
	// No need to seek if we're starting from the beginning
	if (block != 0) {
		DS::std_fseek(file, dataChunkStart + block * waveHeader.fmtBlockAlign, SEEK_SET);
//		consolePrintf("Startframe: %d  msec: %d (%d,%d)\n", startFrame, tenthssec, samples, block);
	}
	
	
	//decompressBlock();
	playNextBlock();
	DS::CD::numLoops = numLoops;
}

void update() {
	playNextBlock();
}

void decompressBlock() {
	int block[2048];
	bool loop = false;
	
	blockCount++;
	
	if (blockCount < 10) return;
	
	
	do {
		DS::std_fread((const void *) &blockHeader, sizeof(blockHeader), 1, file);
	
		DS::std_fread(&block[0], waveHeader.fmtBlockAlign - sizeof(blockHeader), 1, file);

		if (DS::std_feof(file) ) {
			// Reached end of file, so loop
			
			
			if ((numLoops == -1) || (numLoops > 1)) {
				// Seek file to first packet
				if (numLoops != -1) {
					numLoops--;
				}
				DS::std_fseek(file, dataChunkStart, SEEK_SET);
				loop = true;
			} else {
				// Fill decompression buffer with zeros to prevent glitching
				for (int r = 0; r < waveHeader.fmtExtra; r++) {
					decompressionBuffer[r] = 0;
				}
//				consolePrintf("Stopping music\n");
				stopTrack();
				return;
			}
			
		} else {
			loop = false;
		}
		
	} while (loop);
		
		
	if (blocksLeft > 0) {
		blocksLeft--;
	//	consolePrintf("%d ", blocksLeft);
		if (blocksLeft == 0) {
			stopTrack();
			return;
		}
	}
		
	// First sample is in header
	decompressionBuffer[0] = blockHeader.firstSample;
	
	// Set up initial table indeces
	int stepTableIndex = blockHeader.stepTableIndex;
	int prevSample = blockHeader.firstSample;
	
//	consolePrintf("Decompressing block step=%d fs=%d\n", stepTableIndex, prevSample);

	for (int r = 0; r < waveHeader.fmtExtra - 1; r++) {
		
		int word = block[r >> 3];
		int offset = 0;
		
		switch (7 - (r & 0x0007)) {
			case 0: {
				offset = (word & 0xF0000000) >> 28;
				break;
			}
			
			case 1: {
				offset = (word & 0x0F000000) >> 24;
				break;
			}
			
			case 2: {
				offset = (word & 0x00F00000) >> 20;
				break;
			}
			
			case 3: {
				offset = (word & 0x000F0000) >> 16;
				break;
			}

			case 4: {
				offset = (word & 0x0000F000) >> 12;
				break;
			}

			case 5: {
				offset = (word & 0x00000F00) >> 8;
				break;
			}

			case 6: {
				offset = (word & 0x000000F0) >> 4;
				break;
			}

			case 7: {
				offset = (word & 0x0000000F);
				break;
			}
		}
		
		int diff = 0;
		
		if (offset & 4) {
			diff = diff + stepTab[stepTableIndex];
		}
		
		if (offset & 2) {
			diff = diff + (stepTab[stepTableIndex] >> 1);
		}
		
		if (offset & 1) {
			diff = diff + (stepTab[stepTableIndex] >> 2);
		}
		
		diff = diff + (stepTab[stepTableIndex] >> 3);
		
		if (offset & 8) {
			diff = -diff;		
		}
		
		int newSample = prevSample + diff;
		
		if (newSample > 32767) newSample = 32767;
		if (newSample < -32768) newSample = -32768;
		
		decompressionBuffer[r + 1] = newSample;
		
		prevSample = newSample;
		
		stepTableIndex += indexTab[offset];
		
		if (stepTableIndex > 88) stepTableIndex = 88;
		if (stepTableIndex < 0) stepTableIndex = 0;
		

	}
}

void playNextBlock() {
	if (!isPlayingFlag) return;
	int lastBlockId = -1;
	
	while (IPC->adpcm.semaphore);		// Wait for buffer to become free if needed
	IPC->adpcm.semaphore = true;		// Lock the buffer structure to prevent clashing with the ARM7
//	DC_FlushAll();
	
	//-8644, 25088
	for (int block = fillPos + 1; block < fillPos + 4; block++) {

		int blockId = block & 3;
		
		if (IPC->streamFillNeeded[blockId]) {
			
			IPC->streamFillNeeded[blockId] = false;
//			DC_FlushAll();
			
/*			if (!(REG_KEYINPUT & KEY_R)) {
				//consolePrintf("Align: %d First: %d  Step:%d  Res:%d\n", waveHeader.fmtBlockAlign, blockHeader.firstSample, blockHeader.stepTableIndex, blockHeader.reserved);
				consolePrintf("Filling buffer %d\n", blockId);
			}*/
			for (int r = blockId * BUFFER_CHUNK_SIZE; r < (blockId + 1) * BUFFER_CHUNK_SIZE; r++) {
				if (isPlayingFlag) {
					audioBuffer[r] = decompressionBuffer[sampleNum++];
					if (sampleNum >= waveHeader.fmtExtra) {
						decompressBlock();
						sampleNum = 0;
					}
				}
			}
			
			lastBlockId = blockId;
			IPC->streamFillNeeded[blockId] = false;
//			DC_FlushAll();

		}
	
		
		
	}
	
	
	
	if (lastBlockId != -1) {
		fillPos = lastBlockId;
/*		if (!(REG_KEYINPUT & KEY_R)) {
			consolePrintf("Frame fill done\n");
		}*/
	}
	IPC->adpcm.semaphore = false;		// Release the buffer structure
//	DC_FlushAll();
}

void stopTrack() {
	if (!isPlayingFlag) return;

	DS::std_fclose(file);
	
	isPlayingFlag = false;
	
	for (int r = 0; r < BUFFER_SIZE; r++) {
		audioBuffer[r] = 0;
	}
	
	for (int r= 0; r < waveHeader.fmtExtra; r++) {
		decompressionBuffer[r] = 0;
	}
//	DS::stopSound(1);
	
//	free(audioBuffer);
//	free(decompressionBuffer);

	DC_FlushAll();
}

bool trackExists(int num) {
	Common::String path = ConfMan.get("path");

	char fname[128];

	sprintf(fname, "track%d.wav", num);

	if (path[strlen(path.c_str()) - 1] == '/') {
		path = path + fname;
	} else {
		path = path + "/" + fname;
	}
	consolePrintf("Looking for %s...", path.c_str());

	FILE* file;
	if ((file = DS::std_fopen(path.c_str(), "r"))) {
		consolePrintf("Success!\n");
		setActive(true);
		DS::std_fclose(file);
		return true;
	} else {
		setActive(false);
		consolePrintf("Failed!\n");
		return false;
	}
}

bool checkCD() {
	// Need to check whethe CD audio files are present - do this by trying to open Track1.wav.
	consolePrintf("Attempted to open cd drive\n");
	
	if (trackExists(1)) {
		trackStartsAt2 = false;
		return true;
	} else if (trackExists(2)) {
		trackStartsAt2 = true;
		return true;
	} else {
		return false;
	}
}

bool isPlaying() {
	return isPlayingFlag;
}

}
}