aboutsummaryrefslogtreecommitdiffstats
path: root/src/decoder/flac_decoder_plugin.c
blob: 1913480c5e93e0757c900c69992ea9cf37c5e43b (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
/*
 * 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.
 */

#include "config.h" /* must be first for large file support */
#include "flac_common.h"
#include "flac_compat.h"
#include "flac_metadata.h"

#if defined(FLAC_API_VERSION_CURRENT) && FLAC_API_VERSION_CURRENT > 7
#include "ogg_codec.h"
#endif

#include <glib.h>

#include <assert.h>
#include <unistd.h>

#include <sys/stat.h>
#include <sys/types.h>

/* this code was based on flac123, from flac-tools */

static FLAC__StreamDecoderReadStatus
flac_read_cb(G_GNUC_UNUSED const FLAC__StreamDecoder *fd,
	     FLAC__byte buf[], flac_read_status_size_t *bytes,
	     void *fdata)
{
	struct flac_data *data = fdata;
	size_t r;

	r = decoder_read(data->decoder, data->input_stream,
			 (void *)buf, *bytes);
	*bytes = r;

	if (r == 0) {
		if (decoder_get_command(data->decoder) != DECODE_COMMAND_NONE ||
		    input_stream_lock_eof(data->input_stream))
			return FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM;
		else
			return FLAC__STREAM_DECODER_READ_STATUS_ABORT;
	}

	return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
}

static FLAC__StreamDecoderSeekStatus
flac_seek_cb(G_GNUC_UNUSED const FLAC__StreamDecoder *fd,
	     FLAC__uint64 offset, void *fdata)
{
	struct flac_data *data = (struct flac_data *) fdata;

	if (!data->input_stream->seekable)
		return FLAC__STREAM_DECODER_SEEK_STATUS_UNSUPPORTED;

	if (!input_stream_lock_seek(data->input_stream, offset, SEEK_SET,
				    NULL))
		return FLAC__STREAM_DECODER_SEEK_STATUS_ERROR;

	return FLAC__STREAM_DECODER_SEEK_STATUS_OK;
}

static FLAC__StreamDecoderTellStatus
flac_tell_cb(G_GNUC_UNUSED const FLAC__StreamDecoder *fd,
	     FLAC__uint64 * offset, void *fdata)
{
	struct flac_data *data = (struct flac_data *) fdata;

	if (!data->input_stream->seekable)
		return FLAC__STREAM_DECODER_TELL_STATUS_UNSUPPORTED;

	*offset = (long)(data->input_stream->offset);

	return FLAC__STREAM_DECODER_TELL_STATUS_OK;
}

static FLAC__StreamDecoderLengthStatus
flac_length_cb(G_GNUC_UNUSED const FLAC__StreamDecoder *fd,
	       FLAC__uint64 * length, void *fdata)
{
	struct flac_data *data = (struct flac_data *) fdata;

	if (data->input_stream->size < 0)
		return FLAC__STREAM_DECODER_LENGTH_STATUS_UNSUPPORTED;

	*length = (size_t) (data->input_stream->size);

	return FLAC__STREAM_DECODER_LENGTH_STATUS_OK;
}

static FLAC__bool
flac_eof_cb(G_GNUC_UNUSED const FLAC__StreamDecoder *fd, void *fdata)
{
	struct flac_data *data = (struct flac_data *) fdata;

	return (decoder_get_command(data->decoder) != DECODE_COMMAND_NONE &&
		decoder_get_command(data->decoder) != DECODE_COMMAND_SEEK) ||
		input_stream_lock_eof(data->input_stream);
}

static void
flac_error_cb(G_GNUC_UNUSED const FLAC__StreamDecoder *fd,
	      FLAC__StreamDecoderErrorStatus status, void *fdata)
{
	flac_error_common_cb(status, (struct flac_data *) fdata);
}

#if !defined(FLAC_API_VERSION_CURRENT) || FLAC_API_VERSION_CURRENT <= 7
static void flacPrintErroredState(FLAC__SeekableStreamDecoderState state)
{
	switch (state) {
	case FLAC__SEEKABLE_STREAM_DECODER_OK:
	case FLAC__SEEKABLE_STREAM_DECODER_SEEKING:
	case FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM:
		return;

	case FLAC__SEEKABLE_STREAM_DECODER_MEMORY_ALLOCATION_ERROR:
	case FLAC__SEEKABLE_STREAM_DECODER_READ_ERROR:
	case FLAC__SEEKABLE_STREAM_DECODER_SEEK_ERROR:
	case FLAC__SEEKABLE_STREAM_DECODER_STREAM_DECODER_ERROR:
	case FLAC__SEEKABLE_STREAM_DECODER_ALREADY_INITIALIZED:
	case FLAC__SEEKABLE_STREAM_DECODER_INVALID_CALLBACK:
	case FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED:
		break;
	}

	g_warning("%s\n", FLAC__SeekableStreamDecoderStateString[state]);
}
#else /* FLAC_API_VERSION_CURRENT >= 7 */
static void flacPrintErroredState(FLAC__StreamDecoderState state)
{
	switch (state) {
	case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
	case FLAC__STREAM_DECODER_READ_METADATA:
	case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
	case FLAC__STREAM_DECODER_READ_FRAME:
	case FLAC__STREAM_DECODER_END_OF_STREAM:
		return;

	case FLAC__STREAM_DECODER_OGG_ERROR:
	case FLAC__STREAM_DECODER_SEEK_ERROR:
	case FLAC__STREAM_DECODER_ABORTED:
	case FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR:
	case FLAC__STREAM_DECODER_UNINITIALIZED:
		break;
	}

	g_warning("%s\n", FLAC__StreamDecoderStateString[state]);
}
#endif /* FLAC_API_VERSION_CURRENT >= 7 */

static void flacMetadata(G_GNUC_UNUSED const FLAC__StreamDecoder * dec,
			 const FLAC__StreamMetadata * block, void *vdata)
{
	flac_metadata_common_cb(block, (struct flac_data *) vdata);
}

static FLAC__StreamDecoderWriteStatus
flac_write_cb(const FLAC__StreamDecoder *dec, const FLAC__Frame *frame,
	      const FLAC__int32 *const buf[], void *vdata)
{
	struct flac_data *data = (struct flac_data *) vdata;
	FLAC__uint64 nbytes = 0;

	if (FLAC__stream_decoder_get_decode_position(dec, &nbytes)) {
		if (data->position > 0 && nbytes > data->position) {
			nbytes -= data->position;
			data->position += nbytes;
		} else {
			data->position = nbytes;
			nbytes = 0;
		}
	} else
		nbytes = 0;

	return flac_common_write(data, frame, buf, nbytes);
}

static bool
flac_scan_file(const char *file,
	       const struct tag_handler *handler, void *handler_ctx)
{
	return flac_scan_file2(file, NULL, handler, handler_ctx);
}

/**
 * Some glue code around FLAC__stream_decoder_new().
 */
static FLAC__StreamDecoder *
flac_decoder_new(void)
{
	FLAC__StreamDecoder *sd = FLAC__stream_decoder_new();
	if (sd == NULL) {
		g_warning("FLAC__stream_decoder_new() failed");
		return NULL;
	}

#if defined(FLAC_API_VERSION_CURRENT) && FLAC_API_VERSION_CURRENT > 7
	if(!FLAC__stream_decoder_set_metadata_respond(sd, FLAC__METADATA_TYPE_VORBIS_COMMENT))
		g_debug("FLAC__stream_decoder_set_metadata_respond() has failed");
#endif

	return sd;
}

static bool
flac_decoder_initialize(struct flac_data *data, FLAC__StreamDecoder *sd,
			FLAC__uint64 duration)
{
	data->total_frames = duration;

	if (!FLAC__stream_decoder_process_until_end_of_metadata(sd)) {
		g_warning("problem reading metadata");
		return false;
	}

	if (data->initialized) {
		/* done */
		decoder_initialized(data->decoder, &data->audio_format,
				    data->input_stream->seekable,
				    (float)data->total_frames /
				    (float)data->audio_format.sample_rate);
		return true;
	}

	if (data->input_stream->seekable)
		/* allow the workaround below only for nonseekable
		   streams*/
		return false;

	/* no stream_info packet found; try to initialize the decoder
	   from the first frame header */
	FLAC__stream_decoder_process_single(sd);
	return data->initialized;
}

static void
flac_decoder_loop(struct flac_data *data, FLAC__StreamDecoder *flac_dec,
		  FLAC__uint64 t_start, FLAC__uint64 t_end)
{
	struct decoder *decoder = data->decoder;
	enum decoder_command cmd;

	data->first_frame = t_start;

	while (true) {
		if (data->tag != NULL && !tag_is_empty(data->tag)) {
			cmd = decoder_tag(data->decoder, data->input_stream,
					  data->tag);
			tag_free(data->tag);
			data->tag = tag_new();
		} else
			cmd = decoder_get_command(decoder);

		if (cmd == DECODE_COMMAND_SEEK) {
			FLAC__uint64 seek_sample = t_start +
				decoder_seek_where(decoder) *
				data->audio_format.sample_rate;
			if (seek_sample >= t_start &&
			    (t_end == 0 || seek_sample <= t_end) &&
			    FLAC__stream_decoder_seek_absolute(flac_dec, seek_sample)) {
				data->next_frame = seek_sample;
				data->position = 0;
				decoder_command_finished(decoder);
			} else
				decoder_seek_error(decoder);
		} else if (cmd == DECODE_COMMAND_STOP ||
			   FLAC__stream_decoder_get_state(flac_dec) == FLAC__STREAM_DECODER_END_OF_STREAM)
			break;

		if (t_end != 0 && data->next_frame >= t_end)
			/* end of this sub track */
			break;

		if (!FLAC__stream_decoder_process_single(flac_dec) &&
		    decoder_get_command(decoder) == DECODE_COMMAND_NONE) {
			/* a failure that was not triggered by a
			   decoder command */
			flacPrintErroredState(FLAC__stream_decoder_get_state(flac_dec));
			break;
		}
	}
}

static FLAC__StreamDecoderInitStatus
stream_init_oggflac(FLAC__StreamDecoder *flac_dec, struct flac_data *data)
{
#if defined(FLAC_API_VERSION_CURRENT) && FLAC_API_VERSION_CURRENT > 7
	return FLAC__stream_decoder_init_ogg_stream(flac_dec,
						    flac_read_cb,
						    flac_seek_cb,
						    flac_tell_cb,
						    flac_length_cb,
						    flac_eof_cb,
						    flac_write_cb,
						    flacMetadata,
						    flac_error_cb,
						    data);
#else
	(void)flac_dec;
	(void)data;

	return FLAC__STREAM_DECODER_INIT_STATUS_ERROR;
#endif
}

static FLAC__StreamDecoderInitStatus
stream_init_flac(FLAC__StreamDecoder *flac_dec, struct flac_data *data)
{
	return FLAC__stream_decoder_init_stream(flac_dec,
						flac_read_cb, flac_seek_cb,
						flac_tell_cb, flac_length_cb,
						flac_eof_cb, flac_write_cb,
						flacMetadata,
						flac_error_cb,
						data);
}

static FLAC__StreamDecoderInitStatus
stream_init(FLAC__StreamDecoder *flac_dec, struct flac_data *data, bool is_ogg)
{
	return is_ogg
		? stream_init_oggflac(flac_dec, data)
		: stream_init_flac(flac_dec, data);
}

static void
flac_decode_internal(struct decoder * decoder,
		     struct input_stream *input_stream,
		     bool is_ogg)
{
	FLAC__StreamDecoder *flac_dec;
	struct flac_data data;

	flac_dec = flac_decoder_new();
	if (flac_dec == NULL)
		return;

	flac_data_init(&data, decoder, input_stream);
	data.tag = tag_new();

	FLAC__StreamDecoderInitStatus status =
		stream_init(flac_dec, &data, is_ogg);
	if (status != FLAC__STREAM_DECODER_INIT_STATUS_OK) {
		flac_data_deinit(&data);
		FLAC__stream_decoder_delete(flac_dec);
#if defined(FLAC_API_VERSION_CURRENT) && FLAC_API_VERSION_CURRENT > 7
		g_warning("%s", FLAC__StreamDecoderInitStatusString[status]);
#endif
		return;
	}

	if (!flac_decoder_initialize(&data, flac_dec, 0)) {
		flac_data_deinit(&data);
		FLAC__stream_decoder_finish(flac_dec);
		FLAC__stream_decoder_delete(flac_dec);
		return;
	}

	flac_decoder_loop(&data, flac_dec, 0, 0);

	flac_data_deinit(&data);

	FLAC__stream_decoder_finish(flac_dec);
	FLAC__stream_decoder_delete(flac_dec);
}

static void
flac_decode(struct decoder * decoder, struct input_stream *input_stream)
{
	flac_decode_internal(decoder, input_stream, false);
}

#ifndef HAVE_OGGFLAC

static bool
oggflac_init(G_GNUC_UNUSED const struct config_param *param)
{
#if defined(FLAC_API_VERSION_CURRENT) && FLAC_API_VERSION_CURRENT > 7
	return !!FLAC_API_SUPPORTS_OGG_FLAC;
#else
	/* disable oggflac when libflac is too old */
	return false;
#endif
}

#if defined(FLAC_API_VERSION_CURRENT) && FLAC_API_VERSION_CURRENT > 7

static bool
oggflac_scan_file(const char *file,
		  const struct tag_handler *handler, void *handler_ctx)
{
	FLAC__Metadata_Iterator *it;
	FLAC__StreamMetadata *block;
	FLAC__Metadata_Chain *chain = FLAC__metadata_chain_new();

	if (!(FLAC__metadata_chain_read_ogg(chain, file))) {
		FLAC__metadata_chain_delete(chain);
		return false;
	}

	it = FLAC__metadata_iterator_new();
	FLAC__metadata_iterator_init(it, chain);

	do {
		if (!(block = FLAC__metadata_iterator_get_block(it)))
			break;

		flac_scan_metadata(NULL, block,
				   handler, handler_ctx);
	} while (FLAC__metadata_iterator_next(it));
	FLAC__metadata_iterator_delete(it);

	FLAC__metadata_chain_delete(chain);
	return true;
}

static void
oggflac_decode(struct decoder *decoder, struct input_stream *input_stream)
{
	if (ogg_codec_detect(decoder, input_stream) != OGG_CODEC_FLAC)
		return;

	/* rewind the stream, because ogg_codec_detect() has
	   moved it */
	input_stream_lock_seek(input_stream, 0, SEEK_SET, NULL);

	flac_decode_internal(decoder, input_stream, true);
}

static const char *const oggflac_suffixes[] = { "ogg", "oga", NULL };
static const char *const oggflac_mime_types[] = {
	"application/ogg",
	"application/x-ogg",
	"audio/ogg",
	"audio/x-flac+ogg",
	"audio/x-ogg",
	NULL
};

#endif /* FLAC_API_VERSION_CURRENT >= 7 */

const struct decoder_plugin oggflac_decoder_plugin = {
	.name = "oggflac",
	.init = oggflac_init,
#if defined(FLAC_API_VERSION_CURRENT) && FLAC_API_VERSION_CURRENT > 7
	.stream_decode = oggflac_decode,
	.scan_file = oggflac_scan_file,
	.suffixes = oggflac_suffixes,
	.mime_types = oggflac_mime_types
#endif
};

#endif /* HAVE_OGGFLAC */

static const char *const flac_suffixes[] = { "flac", NULL };
static const char *const flac_mime_types[] = {
	"application/flac",
	"application/x-flac",
	"audio/flac",
	"audio/x-flac",
	NULL
};

const struct decoder_plugin flac_decoder_plugin = {
	.name = "flac",
	.stream_decode = flac_decode,
	.scan_file = flac_scan_file,
	.suffixes = flac_suffixes,
	.mime_types = flac_mime_types,
};