aboutsummaryrefslogtreecommitdiffstats
path: root/src/decoder/dsdiff_decoder_plugin.c
blob: 367f8708bd0d5c6e8041e547b5a0cc13b3b81523 (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
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
/*
 * Copyright (C) 2003-2011 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.
 */

/* \file
 *
 * This plugin decodes DSDIFF data (SACD) embedded in DFF files.  It
 * was modeled after the specification found here:
 * http://www.sonicstudio.com/pdf/dsd/DSDIFF_1.5_Spec.pdf
 */

#include "config.h"
#include "dsdiff_decoder_plugin.h"
#include "decoder_api.h"
#include "audio_check.h"
#include "dsd2pcm/dsd2pcm.h"

#include <unistd.h>

#undef G_LOG_DOMAIN
#define G_LOG_DOMAIN "dsdiff"

struct dsdiff_id {
	char value[4];
};

struct dsdiff_header {
	struct dsdiff_id id;
	uint32_t size_high, size_low;
	struct dsdiff_id format;
};

struct dsdiff_chunk_header {
	struct dsdiff_id id;
	uint32_t size_high, size_low;
};

struct dsdiff_metadata {
	unsigned sample_rate, channels;
};

static bool lsbitfirst;

static bool
dsdiff_init(const struct config_param *param)
{
	lsbitfirst = config_get_block_bool(param, "lsbitfirst", false);
	return true;
}

static bool
dsdiff_id_equals(const struct dsdiff_id *id, const char *s)
{
	assert(id != NULL);
	assert(s != NULL);
	assert(strlen(s) == sizeof(id->value));

	return memcmp(id->value, s, sizeof(id->value)) == 0;
}

/**
 * Read the "size" attribute from the specified header, converting it
 * to the host byte order if needed.
 */
G_GNUC_CONST
static uint64_t
dsdiff_chunk_size(const struct dsdiff_chunk_header *header)
{
	return (((uint64_t)GUINT32_FROM_BE(header->size_high)) << 32) |
		((uint64_t)GUINT32_FROM_BE(header->size_low));
}

static bool
dsdiff_read(struct decoder *decoder, struct input_stream *is,
	    void *data, size_t length)
{
	size_t nbytes = decoder_read(decoder, is, data, length);
	return nbytes == length;
}

static bool
dsdiff_read_id(struct decoder *decoder, struct input_stream *is,
	       struct dsdiff_id *id)
{
	return dsdiff_read(decoder, is, id, sizeof(*id));
}

static bool
dsdiff_read_chunk_header(struct decoder *decoder, struct input_stream *is,
			 struct dsdiff_chunk_header *header)
{
	return dsdiff_read(decoder, is, header, sizeof(*header));
}

static bool
dsdiff_read_payload(struct decoder *decoder, struct input_stream *is,
		    const struct dsdiff_chunk_header *header,
		    void *data, size_t length)
{
	uint64_t size = dsdiff_chunk_size(header);
	if (size != (uint64_t)length)
		return false;

	size_t nbytes = decoder_read(decoder, is, data, length);
	return nbytes == length;
}

/**
 * Skip the #input_stream to the specified offset.
 */
static bool
dsdiff_skip_to(struct decoder *decoder, struct input_stream *is,
	       goffset offset)
{
	if (is->seekable)
		return input_stream_seek(is, offset, SEEK_SET, NULL);

	if (is->offset > offset)
		return false;

	char buffer[8192];
	while (is->offset < offset) {
		size_t length = sizeof(buffer);
		if (offset - is->offset < (goffset)length)
			length = offset - is->offset;

		size_t nbytes = decoder_read(decoder, is, buffer, length);
		if (nbytes == 0)
			return false;
	}

	assert(is->offset == offset);
	return true;
}

/**
 * Skip some bytes from the #input_stream.
 */
static bool
dsdiff_skip(struct decoder *decoder, struct input_stream *is,
	    goffset delta)
{
	assert(delta >= 0);

	if (delta == 0)
		return true;

	if (is->seekable)
		return input_stream_seek(is, delta, SEEK_CUR, NULL);

	char buffer[8192];
	while (delta > 0) {
		size_t length = sizeof(buffer);
		if ((goffset)length > delta)
			length = delta;

		size_t nbytes = decoder_read(decoder, is, buffer, length);
		if (nbytes == 0)
			return false;

		delta -= nbytes;
	}

	return true;
}

/**
 * Read and parse a "SND" chunk inside "PROP".
 */
static bool
dsdiff_read_prop_snd(struct decoder *decoder, struct input_stream *is,
		     struct dsdiff_metadata *metadata,
		     goffset end_offset)
{
	struct dsdiff_chunk_header header;
	while ((goffset)(is->offset + sizeof(header)) <= end_offset) {
		if (!dsdiff_read_chunk_header(decoder, is, &header))
			return false;

		goffset chunk_end_offset =
			is->offset + dsdiff_chunk_size(&header);
		if (chunk_end_offset > end_offset)
			return false;

		if (dsdiff_id_equals(&header.id, "FS  ")) {
			uint32_t sample_rate;
			if (!dsdiff_read_payload(decoder, is, &header,
						 &sample_rate,
						 sizeof(sample_rate)))
				return false;

			metadata->sample_rate = GUINT32_FROM_BE(sample_rate);
		} else if (dsdiff_id_equals(&header.id, "CHNL")) {
			uint16_t channels;
			if (dsdiff_chunk_size(&header) < sizeof(channels) ||
			    !dsdiff_read(decoder, is,
					 &channels, sizeof(channels)) ||
			    !dsdiff_skip_to(decoder, is, chunk_end_offset))
				return false;

			metadata->channels = GUINT16_FROM_BE(channels);
		} else if (dsdiff_id_equals(&header.id, "CMPR")) {
			struct dsdiff_id type;
			if (dsdiff_chunk_size(&header) < sizeof(type) ||
			    !dsdiff_read(decoder, is,
					 &type, sizeof(type)) ||
			    !dsdiff_skip_to(decoder, is, chunk_end_offset))
				return false;

			if (!dsdiff_id_equals(&type, "DSD "))
				/* only uincompressed DSD audio data
				   is implemented */
				return false;
		} else {
			/* ignore unknown chunk */

			if (!dsdiff_skip_to(decoder, is, chunk_end_offset))
				return false;
		}
	}

	return is->offset == end_offset;
}

/**
 * Read and parse a "PROP" chunk.
 */
static bool
dsdiff_read_prop(struct decoder *decoder, struct input_stream *is,
		 struct dsdiff_metadata *metadata,
		 const struct dsdiff_chunk_header *prop_header)
{
	uint64_t prop_size = dsdiff_chunk_size(prop_header);
	goffset end_offset = is->offset + prop_size;

	struct dsdiff_id prop_id;
	if (prop_size < sizeof(prop_id) ||
	    !dsdiff_read_id(decoder, is, &prop_id))
		return false;

	if (dsdiff_id_equals(&prop_id, "SND "))
		return dsdiff_read_prop_snd(decoder, is, metadata, end_offset);
	else
		/* ignore unknown PROP chunk */
		return dsdiff_skip_to(decoder, is, end_offset);
}

/**
 * Read and parse all metadata chunks at the beginning.  Stop when the
 * first "DSD" chunk is seen, and return its header in the
 * "chunk_header" parameter.
 */
static bool
dsdiff_read_metadata(struct decoder *decoder, struct input_stream *is,
		     struct dsdiff_metadata *metadata,
		     struct dsdiff_chunk_header *chunk_header)
{
	struct dsdiff_header header;
	if (!dsdiff_read(decoder, is, &header, sizeof(header)) ||
	    !dsdiff_id_equals(&header.id, "FRM8") ||
	    !dsdiff_id_equals(&header.format, "DSD "))
		return false;

	while (true) {
		if (!dsdiff_read_chunk_header(decoder, is, chunk_header))
			return false;

		if (dsdiff_id_equals(&chunk_header->id, "PROP")) {
			if (!dsdiff_read_prop(decoder, is, metadata,
					      chunk_header))
				return false;
		} else if (dsdiff_id_equals(&chunk_header->id, "DSD ")) {
			/* done with metadata */
			return true;
		} else {
			/* ignore unknown chunk */

			uint64_t chunk_size = dsdiff_chunk_size(chunk_header);
			goffset chunk_end_offset = is->offset + chunk_size;

			if (!dsdiff_skip_to(decoder, is, chunk_end_offset))
				return false;
		}
	}
}

G_GNUC_CONST
static inline int32_t
clip(int32_t min, int32_t value, int32_t max)
{
	if (G_UNLIKELY(value < min))
		value = min;
	else if (G_UNLIKELY(value > max))
		value = max;
	return value;
}

/**
 * Convert an array of float samples [-1 .. +1] to padded 24 bit
 * samples.
 */
static void
float_to_uint24(int32_t *dest, const float *src, size_t length)
{
	const float *src_end = src + length;
	while (src < src_end) {
		float f_sample = *src++ * 8388608;
		*dest++ = clip(-8388608, (int32_t)f_sample, 8388607);
	}
}

/**
 * Decode one "DSD" chunk.
 */
static bool
dsdiff_decode_chunk(struct decoder *decoder, struct input_stream *is,
		    unsigned channels,
		    dsd2pcm_ctx **dsd2pcm, uint64_t chunk_size)
{
	uint8_t buffer[8192];
	const size_t sample_size = sizeof(buffer[0]);
	const size_t frame_size = channels * sample_size;
	const unsigned buffer_frames = sizeof(buffer) / frame_size;
	const unsigned buffer_samples = buffer_frames * frame_size;
	const size_t buffer_size = buffer_samples * sample_size;
	float f_buffer[G_N_ELEMENTS(buffer)];
	int32_t i_buffer[G_N_ELEMENTS(buffer)];

	while (chunk_size > 0) {
		/* see how much aligned data from the remaining chunk
		   fits into the local buffer */
		unsigned now_frames = buffer_frames;
		size_t now_size = buffer_size;
		unsigned now_samples = buffer_samples;
		if (chunk_size < (uint64_t)now_size) {
			now_frames = (unsigned)chunk_size / frame_size;
			now_size = now_frames * frame_size;
			now_samples = now_frames * channels;
		}

		size_t nbytes = decoder_read(decoder, is, buffer, now_size);
		if (nbytes != now_size)
			return false;

		chunk_size -= nbytes;

		/* invoke the dsp2pcm library, once for each
		   channel */

		for (unsigned c = 0; c < channels; ++c)
			dsd2pcm_translate(dsd2pcm[c], now_frames,
					  buffer + c, channels,
					  lsbitfirst, f_buffer + c, channels);

		/* convert to integer and submit to the decoder API */

		float_to_uint24(i_buffer, f_buffer, now_samples);
		enum decoder_command cmd =
			decoder_data(decoder, is, i_buffer,
				     now_samples * sizeof(i_buffer[0]),
				     0);
		switch (cmd) {
		case DECODE_COMMAND_NONE:
			break;

		case DECODE_COMMAND_START:
		case DECODE_COMMAND_STOP:
			return false;

		case DECODE_COMMAND_SEEK:
			/* not implemented yet */
			decoder_seek_error(decoder);
			break;
		}
	}

	return dsdiff_skip(decoder, is, chunk_size);
}

static void
dsdiff_stream_decode(struct decoder *decoder, struct input_stream *is)
{
	struct dsdiff_metadata metadata = {
		.sample_rate = 0,
		.channels = 0,
	};

	struct dsdiff_chunk_header chunk_header;
	if (!dsdiff_read_metadata(decoder, is, &metadata, &chunk_header))
		return;

	GError *error = NULL;
	struct audio_format audio_format;
	if (!audio_format_init_checked(&audio_format, metadata.sample_rate / 8,
				       SAMPLE_FORMAT_S24_P32,
				       metadata.channels, &error)) {
		g_warning("%s", error->message);
		g_error_free(error);
		return;
	}

	/* initialize the dsd2pcm library */

	dsd2pcm_ctx *dsd2pcm[MAX_CHANNELS];
	for (unsigned i = 0; i < metadata.channels; ++i) {
		dsd2pcm[i] = dsd2pcm_init();
		if (dsd2pcm[i] == NULL) {
			for (unsigned j = 0; j < i; ++j)
				dsd2pcm_destroy(dsd2pcm[j]);
			return;
		}
	}

	/* success: file was recognized */

	decoder_initialized(decoder, &audio_format, false, -1);

	/* every iteration of the following loop decodes one "DSD"
	   chunk */

	while (true) {
		uint64_t chunk_size = dsdiff_chunk_size(&chunk_header);

		if (dsdiff_id_equals(&chunk_header.id, "DSD ")) {
			if (!dsdiff_decode_chunk(decoder, is,
						 metadata.channels,
						 dsd2pcm, chunk_size))
				break;
		} else {
			/* ignore other chunks */

			if (!dsdiff_skip(decoder, is, chunk_size))
				break;
		}

		/* read next chunk header; the first one was read by
		   dsdiff_read_metadata() */

		if (!dsdiff_read_chunk_header(decoder, is, &chunk_header))
			break;
	}

	for (unsigned i = 0; i < metadata.channels; ++i)
		dsd2pcm_destroy(dsd2pcm[i]);
}

static struct tag *
dsdiff_stream_tag(struct input_stream *is)
{
	struct dsdiff_metadata metadata = {
		.sample_rate = 0,
		.channels = 0,
	};

	struct dsdiff_chunk_header chunk_header;
	if (!dsdiff_read_metadata(NULL, is, &metadata, &chunk_header))
		return NULL;

	struct audio_format audio_format;
	if (!audio_format_init_checked(&audio_format, metadata.sample_rate / 8,
				       SAMPLE_FORMAT_S24_P32,
				       metadata.channels, NULL))
		/* refuse to parse files which we cannot play anyway */
		return NULL;

	/* no total time estimate, no tags implemented yet */
	return tag_new();
}

static const char *const dsdiff_suffixes[] = {
	"dff",
	NULL
};

static const char *const dsdiff_mime_types[] = {
	"application/x-dff",
	NULL
};

const struct decoder_plugin dsdiff_decoder_plugin = {
	.name = "dsdiff",
	.init = dsdiff_init,
	.stream_decode = dsdiff_stream_decode,
	.stream_tag = dsdiff_stream_tag,
	.suffixes = dsdiff_suffixes,
	.mime_types = dsdiff_mime_types,
};