aboutsummaryrefslogtreecommitdiffstats
path: root/src/decoder/ffmpeg_decoder_plugin.c
blob: 96a88a58859079cb2c98b1915be91c48ec11eb0e (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
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
/*
 * 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"
#include "decoder_api.h"
#include "audio_check.h"

#include <glib.h>

#include <assert.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>

#include <libavcodec/avcodec.h>
#include <libavformat/avformat.h>
#include <libavformat/avio.h>
#include <libavutil/avutil.h>
#include <libavutil/log.h>
#include <libavutil/mathematics.h>
#if LIBAVUTIL_VERSION_INT >= AV_VERSION_INT(51,5,0)
#include <libavutil/dict.h>
#endif

#undef G_LOG_DOMAIN
#define G_LOG_DOMAIN "ffmpeg"

static GLogLevelFlags
level_ffmpeg_to_glib(int level)
{
	if (level <= AV_LOG_FATAL)
		return G_LOG_LEVEL_CRITICAL;

	if (level <= AV_LOG_ERROR)
		return G_LOG_LEVEL_WARNING;

	if (level <= AV_LOG_INFO)
		return G_LOG_LEVEL_MESSAGE;

	return G_LOG_LEVEL_DEBUG;
}

static void
mpd_ffmpeg_log_callback(G_GNUC_UNUSED void *ptr, int level,
			const char *fmt, va_list vl)
{
	const AVClass * cls = NULL;

	if (ptr != NULL)
		cls = *(const AVClass *const*)ptr;

	if (cls != NULL) {
		char *domain = g_strconcat(G_LOG_DOMAIN, "/", cls->item_name(ptr), NULL);
		g_logv(domain, level_ffmpeg_to_glib(level), fmt, vl);
		g_free(domain);
	}
}


#ifndef AV_VERSION_INT
#define AV_VERSION_INT(a, b, c) (a<<16 | b<<8 | c)
#endif

struct mpd_ffmpeg_stream {
	struct decoder *decoder;
	struct input_stream *input;

#if LIBAVFORMAT_VERSION_INT >= AV_VERSION_INT(52,101,0)
	AVIOContext *io;
#else
	ByteIOContext *io;
#endif
	unsigned char buffer[8192];
};

static int
mpd_ffmpeg_stream_read(void *opaque, uint8_t *buf, int size)
{
	struct mpd_ffmpeg_stream *stream = opaque;

	return decoder_read(stream->decoder, stream->input,
			    (void *)buf, size);
}

static int64_t
mpd_ffmpeg_stream_seek(void *opaque, int64_t pos, int whence)
{
	struct mpd_ffmpeg_stream *stream = opaque;

	if (whence == AVSEEK_SIZE)
		return stream->input->size;

	if (!input_stream_lock_seek(stream->input, pos, whence, NULL))
		return -1;

	return stream->input->offset;
}

static struct mpd_ffmpeg_stream *
mpd_ffmpeg_stream_open(struct decoder *decoder, struct input_stream *input)
{
	struct mpd_ffmpeg_stream *stream = g_new(struct mpd_ffmpeg_stream, 1);
	stream->decoder = decoder;
	stream->input = input;
#if LIBAVFORMAT_VERSION_INT >= AV_VERSION_INT(52,101,0)
	stream->io = avio_alloc_context(stream->buffer, sizeof(stream->buffer),
					false, stream,
					mpd_ffmpeg_stream_read, NULL,
					input->seekable
					? mpd_ffmpeg_stream_seek : NULL);
#else
	stream->io = av_alloc_put_byte(stream->buffer, sizeof(stream->buffer),
				       false, stream,
				       mpd_ffmpeg_stream_read, NULL,
				       input->seekable
				       ? mpd_ffmpeg_stream_seek : NULL);
#endif
	if (stream->io == NULL) {
		g_free(stream);
		return NULL;
	}

	return stream;
}

/**
 * API compatibility wrapper for av_open_input_stream() and
 * avformat_open_input().
 */
static int
mpd_ffmpeg_open_input(AVFormatContext **ic_ptr,
#if LIBAVFORMAT_VERSION_INT >= AV_VERSION_INT(52,101,0)
		      AVIOContext *pb,
#else
		      ByteIOContext *pb,
#endif
		      const char *filename,
		      AVInputFormat *fmt)
{
#if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(53,1,3)
	AVFormatContext *context = avformat_alloc_context();
	if (context == NULL)
		return AVERROR(ENOMEM);

	context->pb = pb;
	*ic_ptr = context;
	return avformat_open_input(ic_ptr, filename, fmt, NULL);
#else
	return av_open_input_stream(ic_ptr, pb, filename, fmt, NULL);
#endif
}

static void
mpd_ffmpeg_stream_close(struct mpd_ffmpeg_stream *stream)
{
	av_free(stream->io);
	g_free(stream);
}

static bool
ffmpeg_init(G_GNUC_UNUSED const struct config_param *param)
{
	av_log_set_callback(mpd_ffmpeg_log_callback);

	av_register_all();
	return true;
}

static int
ffmpeg_find_audio_stream(const AVFormatContext *format_context)
{
	for (unsigned i = 0; i < format_context->nb_streams; ++i)
		if (format_context->streams[i]->codec->codec_type ==
#if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(52, 64, 0)
		    AVMEDIA_TYPE_AUDIO)
#else
		    CODEC_TYPE_AUDIO)
#endif
			return i;

	return -1;
}

#if LIBAVCODEC_VERSION_INT < AV_VERSION_INT(53,25,0)
/**
 * On some platforms, libavcodec wants the output buffer aligned to 16
 * bytes (because it uses SSE/Altivec internally).  This function
 * returns the aligned version of the specified buffer, and corrects
 * the buffer size.
 */
static void *
align16(void *p, size_t *length_p)
{
	unsigned add = 16 - (size_t)p % 16;

	*length_p -= add;
	return (char *)p + add;
}
#endif

G_GNUC_CONST
static double
time_from_ffmpeg(int64_t t, const AVRational time_base)
{
	assert(t != (int64_t)AV_NOPTS_VALUE);

	return (double)av_rescale_q(t, time_base, (AVRational){1, 1024})
		/ (double)1024;
}

G_GNUC_CONST
static int64_t
time_to_ffmpeg(double t, const AVRational time_base)
{
	return av_rescale_q((int64_t)(t * 1024), (AVRational){1, 1024},
			    time_base);
}

#if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(53,25,0)
/**
 * Copy PCM data from a AVFrame to an interleaved buffer.
 */
static int
copy_interleave_frame(const AVCodecContext *codec_context,
		      const AVFrame *frame,
		      uint8_t *buffer, size_t buffer_size)
{
	int plane_size;
	const int data_size =
		av_samples_get_buffer_size(&plane_size,
					   codec_context->channels,
					   frame->nb_samples,
					   codec_context->sample_fmt, 1);
	if (buffer_size < (size_t)data_size)
		/* buffer is too small - shouldn't happen */
		return AVERROR(EINVAL);

	if (av_sample_fmt_is_planar(codec_context->sample_fmt) &&
	    codec_context->channels > 1) {
		for (int i = 0, channels = codec_context->channels;
		     i < channels; i++) {
			memcpy(buffer, frame->extended_data[i], plane_size);
			buffer += plane_size;
		}
	} else {
		memcpy(buffer, frame->extended_data[0], data_size);
	}

	return data_size;
}
#endif

static enum decoder_command
ffmpeg_send_packet(struct decoder *decoder, struct input_stream *is,
		   const AVPacket *packet,
		   AVCodecContext *codec_context,
		   const AVRational *time_base)
{
	if (packet->pts != (int64_t)AV_NOPTS_VALUE)
		decoder_timestamp(decoder,
				  time_from_ffmpeg(packet->pts, *time_base));

#if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(52,25,0)
	AVPacket packet2 = *packet;
#else
	const uint8_t *packet_data = packet->data;
	int packet_size = packet->size;
#endif

#if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(53,25,0)
	uint8_t aligned_buffer[(AVCODEC_MAX_AUDIO_FRAME_SIZE * 3) / 2 + 16];
	const size_t buffer_size = sizeof(aligned_buffer);
#else
	/* libavcodec < 0.8 needs an aligned buffer */
	uint8_t audio_buf[(AVCODEC_MAX_AUDIO_FRAME_SIZE * 3) / 2 + 16];
	size_t buffer_size = sizeof(audio_buf);
	int16_t *aligned_buffer = align16(audio_buf, &buffer_size);
#endif

	enum decoder_command cmd = DECODE_COMMAND_NONE;
	while (
#if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(52,25,0)
	       packet2.size > 0 &&
#else
	       packet_size > 0 &&
#endif
	       cmd == DECODE_COMMAND_NONE) {
		int audio_size = buffer_size;
#if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(53,25,0)
		AVFrame frame;
		int got_frame = 0;
		int len = avcodec_decode_audio4(codec_context,
						&frame, &got_frame,
						&packet2);
		if (len >= 0 && got_frame) {
			audio_size = copy_interleave_frame(codec_context,
							   &frame,
							   aligned_buffer,
							   buffer_size);
			if (audio_size < 0)
				len = audio_size;
		} else if (len >= 0)
			len = -1;
#elif LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(52,25,0)
		int len = avcodec_decode_audio3(codec_context,
						aligned_buffer, &audio_size,
						&packet2);
#else
		int len = avcodec_decode_audio2(codec_context,
						aligned_buffer, &audio_size,
						packet_data, packet_size);
#endif

		if (len < 0) {
			/* if error, we skip the frame */
			g_message("decoding failed\n");
			break;
		}

#if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(52,25,0)
		packet2.data += len;
		packet2.size -= len;
#else
		packet_data += len;
		packet_size -= len;
#endif

		if (audio_size <= 0)
			continue;

		cmd = decoder_data(decoder, is,
				   aligned_buffer, audio_size,
				   codec_context->bit_rate / 1000);
	}
	return cmd;
}

static enum sample_format
ffmpeg_sample_format(G_GNUC_UNUSED const AVCodecContext *codec_context)
{
	switch (codec_context->sample_fmt) {
	case SAMPLE_FMT_S16:
		return SAMPLE_FORMAT_S16;

	case SAMPLE_FMT_S32:
		return SAMPLE_FORMAT_S32;

	default:
		g_warning("Unsupported libavcodec SampleFormat value: %d",
			  codec_context->sample_fmt);
		return SAMPLE_FORMAT_UNDEFINED;
	}
}

static AVInputFormat *
ffmpeg_probe(struct decoder *decoder, struct input_stream *is)
{
	enum {
		BUFFER_SIZE = 16384,
		PADDING = 16,
	};

	unsigned char *buffer = g_malloc(BUFFER_SIZE);
	size_t nbytes = decoder_read(decoder, is, buffer, BUFFER_SIZE);
	if (nbytes <= PADDING ||
	    !input_stream_lock_seek(is, 0, SEEK_SET, NULL)) {
		g_free(buffer);
		return NULL;
	}

	/* some ffmpeg parsers (e.g. ac3_parser.c) read a few bytes
	   beyond the declared buffer limit, which makes valgrind
	   angry; this workaround removes some padding from the buffer
	   size */
	nbytes -= PADDING;

	AVProbeData avpd = {
		.buf = buffer,
		.buf_size = nbytes,
		.filename = is->uri,
	};

	AVInputFormat *format = av_probe_input_format(&avpd, true);
	g_free(buffer);

	return format;
}

static void
ffmpeg_decode(struct decoder *decoder, struct input_stream *input)
{
	AVInputFormat *input_format = ffmpeg_probe(decoder, input);
	if (input_format == NULL)
		return;

	g_debug("detected input format '%s' (%s)",
		input_format->name, input_format->long_name);

	struct mpd_ffmpeg_stream *stream =
		mpd_ffmpeg_stream_open(decoder, input);
	if (stream == NULL) {
		g_warning("Failed to open stream");
		return;
	}

	//ffmpeg works with ours "fileops" helper
	AVFormatContext *format_context = NULL;
	if (mpd_ffmpeg_open_input(&format_context, stream->io, input->uri,
				  input_format) != 0) {
		g_warning("Open failed\n");
		mpd_ffmpeg_stream_close(stream);
		return;
	}

#if LIBAVFORMAT_VERSION_INT >= AV_VERSION_INT(53,6,0)
	const int find_result =
		avformat_find_stream_info(format_context, NULL);
#else
	const int find_result = av_find_stream_info(format_context);
#endif
	if (find_result < 0) {
		g_warning("Couldn't find stream info\n");
#if LIBAVFORMAT_VERSION_INT >= AV_VERSION_INT(53,17,0)
		avformat_close_input(&format_context);
#else
		av_close_input_stream(format_context);
#endif
		mpd_ffmpeg_stream_close(stream);
		return;
	}

	int audio_stream = ffmpeg_find_audio_stream(format_context);
	if (audio_stream == -1) {
		g_warning("No audio stream inside\n");
#if LIBAVFORMAT_VERSION_INT >= AV_VERSION_INT(53,17,0)
		avformat_close_input(&format_context);
#else
		av_close_input_stream(format_context);
#endif
		mpd_ffmpeg_stream_close(stream);
		return;
	}

	AVStream *av_stream = format_context->streams[audio_stream];

	AVCodecContext *codec_context = av_stream->codec;
	if (codec_context->codec_name[0] != 0)
		g_debug("codec '%s'", codec_context->codec_name);

	AVCodec *codec = avcodec_find_decoder(codec_context->codec_id);

	if (!codec) {
		g_warning("Unsupported audio codec\n");
#if LIBAVFORMAT_VERSION_INT >= AV_VERSION_INT(53,17,0)
		avformat_close_input(&format_context);
#else
		av_close_input_stream(format_context);
#endif
		mpd_ffmpeg_stream_close(stream);
		return;
	}

	GError *error = NULL;
	struct audio_format audio_format;
	if (!audio_format_init_checked(&audio_format,
				       codec_context->sample_rate,
				       ffmpeg_sample_format(codec_context),
				       codec_context->channels, &error)) {
		g_warning("%s", error->message);
		g_error_free(error);
#if LIBAVFORMAT_VERSION_INT >= AV_VERSION_INT(53,17,0)
		avformat_close_input(&format_context);
#else
		av_close_input_stream(format_context);
#endif
		mpd_ffmpeg_stream_close(stream);
		return;
	}

	/* the audio format must be read from AVCodecContext by now,
	   because avcodec_open() has been demonstrated to fill bogus
	   values into AVCodecContext.channels - a change that will be
	   reverted later by avcodec_decode_audio3() */

#if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(53,6,0)
	const int open_result = avcodec_open2(codec_context, codec, NULL);
#else
	const int open_result = avcodec_open(codec_context, codec);
#endif
	if (open_result < 0) {
		g_warning("Could not open codec\n");
#if LIBAVFORMAT_VERSION_INT >= AV_VERSION_INT(53,17,0)
		avformat_close_input(&format_context);
#else
		av_close_input_stream(format_context);
#endif
		mpd_ffmpeg_stream_close(stream);
		return;
	}

	int total_time = format_context->duration != (int64_t)AV_NOPTS_VALUE
		? format_context->duration / AV_TIME_BASE
		: 0;

	decoder_initialized(decoder, &audio_format,
			    input->seekable, total_time);

	AVDictionaryEntry *entry =
		av_dict_get(format_context->metadata, "replaygain_track_gain", NULL, 0);
	if (entry != NULL)
		g_printerr("replaygain_track_gain=%s\n", entry->value);

	enum decoder_command cmd;
	do {
		AVPacket packet;
		if (av_read_frame(format_context, &packet) < 0)
			/* end of file */
			break;

		if (packet.stream_index == audio_stream)
			cmd = ffmpeg_send_packet(decoder, input,
						 &packet, codec_context,
						 &av_stream->time_base);
		else
			cmd = decoder_get_command(decoder);

		av_free_packet(&packet);

		if (cmd == DECODE_COMMAND_SEEK) {
			int64_t where =
				time_to_ffmpeg(decoder_seek_where(decoder),
					       av_stream->time_base);

			if (av_seek_frame(format_context, audio_stream, where,
					  AV_TIME_BASE) < 0)
				decoder_seek_error(decoder);
			else {
				avcodec_flush_buffers(codec_context);
				decoder_command_finished(decoder);
			}
		}
	} while (cmd != DECODE_COMMAND_STOP);

	avcodec_close(codec_context);
#if LIBAVFORMAT_VERSION_INT >= AV_VERSION_INT(53,17,0)
	avformat_close_input(&format_context);
#else
	av_close_input_stream(format_context);
#endif
	mpd_ffmpeg_stream_close(stream);
}

typedef struct ffmpeg_tag_map {
	enum tag_type type;
	const char *name;
} ffmpeg_tag_map;

static const ffmpeg_tag_map ffmpeg_tag_maps[] = {
	{ TAG_TITLE,             "title" },
#if LIBAVFORMAT_VERSION_INT >= ((52<<16)+(50<<8))
	{ TAG_ARTIST,            "artist" },
	{ TAG_DATE,              "date" },
#else
	{ TAG_ARTIST,            "author" },
	{ TAG_DATE,              "year" },
#endif
	{ TAG_ALBUM,             "album" },
	{ TAG_COMMENT,           "comment" },
	{ TAG_GENRE,             "genre" },
	{ TAG_TRACK,             "track" },
	{ TAG_ARTIST_SORT,       "author-sort" },
	{ TAG_ALBUM_ARTIST,      "album_artist" },
	{ TAG_ALBUM_ARTIST_SORT, "album_artist-sort" },
	{ TAG_COMPOSER,          "composer" },
	{ TAG_PERFORMER,         "performer" },
	{ TAG_DISC,              "disc" },
};

static bool
ffmpeg_copy_metadata(struct tag *tag,
#if LIBAVFORMAT_VERSION_INT >= AV_VERSION_INT(53,1,0)
		     AVDictionary *m,
#else
		     AVMetadata *m,
#endif
		     const ffmpeg_tag_map tag_map)
{
#if LIBAVUTIL_VERSION_INT >= AV_VERSION_INT(51,5,0)
	AVDictionaryEntry *mt = NULL;

	while ((mt = av_dict_get(m, tag_map.name, mt, 0)) != NULL)
		tag_add_item(tag, tag_map.type, mt->value);
#else
	AVMetadataTag *mt = NULL;

	while ((mt = av_metadata_get(m, tag_map.name, mt, 0)) != NULL)
		tag_add_item(tag, tag_map.type, mt->value);
#endif

	return mt != NULL;
}

//no tag reading in ffmpeg, check if playable
static struct tag *
ffmpeg_stream_tag(struct input_stream *is)
{
	AVInputFormat *input_format = ffmpeg_probe(NULL, is);
	if (input_format == NULL)
		return NULL;

	struct mpd_ffmpeg_stream *stream = mpd_ffmpeg_stream_open(NULL, is);
	if (stream == NULL)
		return NULL;

	AVFormatContext *f = NULL;
	if (mpd_ffmpeg_open_input(&f, stream->io, is->uri,
				  input_format) != 0) {
		mpd_ffmpeg_stream_close(stream);
		return NULL;
	}

#if LIBAVFORMAT_VERSION_INT >= AV_VERSION_INT(53,6,0)
	const int find_result =
		avformat_find_stream_info(f, NULL);
#else
	const int find_result = av_find_stream_info(f);
#endif
	if (find_result < 0) {
#if LIBAVFORMAT_VERSION_INT >= AV_VERSION_INT(53,17,0)
		avformat_close_input(&f);
#else
		av_close_input_stream(f);
#endif
		mpd_ffmpeg_stream_close(stream);
		return NULL;
	}

	struct tag *tag = tag_new();

	tag->time = f->duration != (int64_t)AV_NOPTS_VALUE
		? f->duration / AV_TIME_BASE
		: 0;

#if LIBAVFORMAT_VERSION_INT < AV_VERSION_INT(52,101,0)
	av_metadata_conv(f, NULL, f->iformat->metadata_conv);
#endif

	for (unsigned i = 0; i < sizeof(ffmpeg_tag_maps)/sizeof(ffmpeg_tag_map); i++) {
		int idx = ffmpeg_find_audio_stream(f);
		ffmpeg_copy_metadata(tag, f->metadata, ffmpeg_tag_maps[i]);
		if (idx >= 0)
			ffmpeg_copy_metadata(tag, f->streams[idx]->metadata, ffmpeg_tag_maps[i]);
	}

#if LIBAVFORMAT_VERSION_INT >= AV_VERSION_INT(53,17,0)
	avformat_close_input(&f);
#else
	av_close_input_stream(f);
#endif
	mpd_ffmpeg_stream_close(stream);

	return tag;
}

/**
 * A list of extensions found for the formats supported by ffmpeg.
 * This list is current as of 02-23-09; To find out if there are more
 * supported formats, check the ffmpeg changelog since this date for
 * more formats.
 */
static const char *const ffmpeg_suffixes[] = {
	"16sv", "3g2", "3gp", "4xm", "8svx", "aa3", "aac", "ac3", "afc", "aif",
	"aifc", "aiff", "al", "alaw", "amr", "anim", "apc", "ape", "asf",
	"atrac", "au", "aud", "avi", "avm2", "avs", "bap", "bfi", "c93", "cak",
	"cin", "cmv", "cpk", "daud", "dct", "divx", "dts", "dv", "dvd", "dxa",
	"eac3", "film", "flac", "flc", "fli", "fll", "flx", "flv", "g726",
	"gsm", "gxf", "iss", "m1v", "m2v", "m2t", "m2ts",
	"m4a", "m4b", "m4v",
	"mad",
	"mj2", "mjpeg", "mjpg", "mka", "mkv", "mlp", "mm", "mmf", "mov", "mp+",
	"mp1", "mp2", "mp3", "mp4", "mpc", "mpeg", "mpg", "mpga", "mpp", "mpu",
	"mve", "mvi", "mxf", "nc", "nsv", "nut", "nuv", "oga", "ogm", "ogv",
	"ogx", "oma", "ogg", "omg", "psp", "pva", "qcp", "qt", "r3d", "ra",
	"ram", "rl2", "rm", "rmvb", "roq", "rpl", "rvc", "shn", "smk", "snd",
	"sol", "son", "spx", "str", "swf", "tgi", "tgq", "tgv", "thp", "ts",
	"tsp", "tta", "xa", "xvid", "uv", "uv2", "vb", "vid", "vob", "voc",
	"vp6", "vmd", "wav", "wma", "wmv", "wsaud", "wsvga", "wv", "wve",
	NULL
};

static const char *const ffmpeg_mime_types[] = {
	"application/m4a",
	"application/mp4",
	"application/octet-stream",
	"application/ogg",
	"application/x-ms-wmz",
	"application/x-ms-wmd",
	"application/x-ogg",
	"application/x-shockwave-flash",
	"application/x-shorten",
	"audio/8svx",
	"audio/16sv",
	"audio/aac",
	"audio/ac3",
	"audio/aiff"
	"audio/amr",
	"audio/basic",
	"audio/flac",
	"audio/m4a",
	"audio/mp4",
	"audio/mpeg",
	"audio/musepack",
	"audio/ogg",
	"audio/qcelp",
	"audio/vorbis",
	"audio/vorbis+ogg",
	"audio/x-8svx",
	"audio/x-16sv",
	"audio/x-aac",
	"audio/x-ac3",
	"audio/x-aiff"
	"audio/x-alaw",
	"audio/x-au",
	"audio/x-dca",
	"audio/x-eac3",
	"audio/x-flac",
	"audio/x-gsm",
	"audio/x-mace",
	"audio/x-matroska",
	"audio/x-monkeys-audio",
	"audio/x-mpeg",
	"audio/x-ms-wma",
	"audio/x-ms-wax",
	"audio/x-musepack",
	"audio/x-ogg",
	"audio/x-vorbis",
	"audio/x-vorbis+ogg",
	"audio/x-pn-realaudio",
	"audio/x-pn-multirate-realaudio",
	"audio/x-speex",
	"audio/x-tta"
	"audio/x-voc",
	"audio/x-wav",
	"audio/x-wma",
	"audio/x-wv",
	"video/anim",
	"video/quicktime",
	"video/msvideo",
	"video/ogg",
	"video/theora",
	"video/x-dv",
	"video/x-flv",
	"video/x-matroska",
	"video/x-mjpeg",
	"video/x-mpeg",
	"video/x-ms-asf",
	"video/x-msvideo",
	"video/x-ms-wmv",
	"video/x-ms-wvx",
	"video/x-ms-wm",
	"video/x-ms-wmx",
	"video/x-nut",
	"video/x-pva",
	"video/x-theora",
	"video/x-vid",
	"video/x-wmv",
	"video/x-xvid",

	/* special value for the "ffmpeg" input plugin: all streams by
	   the "ffmpeg" input plugin shall be decoded by this
	   plugin */
	"audio/x-mpd-ffmpeg",

	NULL
};

const struct decoder_plugin ffmpeg_decoder_plugin = {
	.name = "ffmpeg",
	.init = ffmpeg_init,
	.stream_decode = ffmpeg_decode,
	.stream_tag = ffmpeg_stream_tag,
	.suffixes = ffmpeg_suffixes,
	.mime_types = ffmpeg_mime_types
};