aboutsummaryrefslogtreecommitdiffstats
path: root/src/decoder/VorbisDecoderPlugin.cxx
blob: d6b0f5eb089bfcd77eb4006b98664e44ad0ea2dc (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
/*
 * 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 "VorbisDecoderPlugin.h"
#include "VorbisComments.hxx"
#include "DecoderAPI.hxx"
#include "InputStream.hxx"
#include "OggCodec.hxx"
#include "util/Error.hxx"
#include "util/UriUtil.hxx"
#include "CheckAudioFormat.hxx"
#include "TagHandler.hxx"

#ifndef HAVE_TREMOR
#define OV_EXCLUDE_STATIC_CALLBACKS
#include <vorbis/vorbisfile.h>
#else
#include <tremor/ivorbisfile.h>
/* Macros to make Tremor's API look like libogg. Tremor always
   returns host-byte-order 16-bit signed data, and uses integer
   milliseconds where libogg uses double seconds.
*/
#define ov_read(VF, BUFFER, LENGTH, BIGENDIANP, WORD, SGNED, BITSTREAM) \
        ov_read(VF, BUFFER, LENGTH, BITSTREAM)
#define ov_time_total(VF, I) ((double)ov_time_total(VF, I)/1000)
#define ov_time_tell(VF) ((double)ov_time_tell(VF)/1000)
#define ov_time_seek_page(VF, S) (ov_time_seek_page(VF, (S)*1000))
#endif /* HAVE_TREMOR */

#include <glib.h>

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

#undef G_LOG_DOMAIN
#define G_LOG_DOMAIN "vorbis"

#if G_BYTE_ORDER == G_BIG_ENDIAN
#define VORBIS_BIG_ENDIAN true
#else
#define VORBIS_BIG_ENDIAN false
#endif

struct vorbis_input_stream {
	struct decoder *decoder;

	struct input_stream *input_stream;
	bool seekable;
};

static size_t ogg_read_cb(void *ptr, size_t size, size_t nmemb, void *data)
{
	struct vorbis_input_stream *vis = (struct vorbis_input_stream *)data;
	size_t ret = decoder_read(vis->decoder, vis->input_stream,
				  ptr, size * nmemb);

	errno = 0;

	return ret / size;
}

static int ogg_seek_cb(void *data, ogg_int64_t offset, int whence)
{
	struct vorbis_input_stream *vis = (struct vorbis_input_stream *)data;

	Error error;
	return vis->seekable &&
		(!vis->decoder || decoder_get_command(vis->decoder) != DECODE_COMMAND_STOP) &&
		vis->input_stream->LockSeek(offset, whence, error)
		? 0 : -1;
}

/* TODO: check Ogg libraries API and see if we can just not have this func */
static int ogg_close_cb(gcc_unused void *data)
{
	return 0;
}

static long ogg_tell_cb(void *data)
{
	struct vorbis_input_stream *vis = (struct vorbis_input_stream *)data;

	return (long)vis->input_stream->offset;
}

static const ov_callbacks vorbis_is_callbacks = {
	ogg_read_cb,
	ogg_seek_cb,
	ogg_close_cb,
	ogg_tell_cb,
};

static const char *
vorbis_strerror(int code)
{
	switch (code) {
	case OV_EREAD:
		return "read error";

	case OV_ENOTVORBIS:
		return "not vorbis stream";

	case OV_EVERSION:
		return "vorbis version mismatch";

	case OV_EBADHEADER:
		return "invalid vorbis header";

	case OV_EFAULT:
		return "internal logic error";

	default:
		return "unknown error";
	}
}

static bool
vorbis_is_open(struct vorbis_input_stream *vis, OggVorbis_File *vf,
	       struct decoder *decoder, struct input_stream *input_stream)
{
	vis->decoder = decoder;
	vis->input_stream = input_stream;
	vis->seekable = input_stream->CheapSeeking();

	int ret = ov_open_callbacks(vis, vf, NULL, 0, vorbis_is_callbacks);
	if (ret < 0) {
		if (decoder == NULL ||
		    decoder_get_command(decoder) == DECODE_COMMAND_NONE)
			g_warning("Failed to open Ogg Vorbis stream: %s",
				  vorbis_strerror(ret));
		return false;
	}

	return true;
}

static void
vorbis_send_comments(struct decoder *decoder, struct input_stream *is,
		     char **comments)
{
	Tag *tag = vorbis_comments_to_tag(comments);
	if (!tag)
		return;

	decoder_tag(decoder, is, std::move(*tag));
	delete tag;
}

#ifndef HAVE_TREMOR
static void
vorbis_interleave(float *dest, const float *const*src,
		  unsigned nframes, unsigned channels)
{
	for (const float *const*src_end = src + channels;
	     src != src_end; ++src, ++dest) {
		float *d = dest;
		for (const float *s = *src, *s_end = s + nframes;
		     s != s_end; ++s, d += channels)
			*d = *s;
	}
}
#endif

/* public */
static void
vorbis_stream_decode(struct decoder *decoder,
		     struct input_stream *input_stream)
{
	if (ogg_codec_detect(decoder, input_stream) != OGG_CODEC_VORBIS)
		return;

	/* rewind the stream, because ogg_codec_detect() has
	   moved it */
	input_stream->LockSeek(0, SEEK_SET, IgnoreError());

	struct vorbis_input_stream vis;
	OggVorbis_File vf;
	if (!vorbis_is_open(&vis, &vf, decoder, input_stream))
		return;

	const vorbis_info *vi = ov_info(&vf, -1);
	if (vi == NULL) {
		g_warning("ov_info() has failed");
		return;
	}

	Error error;
	AudioFormat audio_format;
	if (!audio_format_init_checked(audio_format, vi->rate,
#ifdef HAVE_TREMOR
				       SampleFormat::S16,
#else
				       SampleFormat::FLOAT,
#endif
				       vi->channels, error)) {
		g_warning("%s", error.GetMessage());
		return;
	}

	float total_time = ov_time_total(&vf, -1);
	if (total_time < 0)
		total_time = 0;

	decoder_initialized(decoder, audio_format, vis.seekable, total_time);

	enum decoder_command cmd = decoder_get_command(decoder);

#ifdef HAVE_TREMOR
	char buffer[4096];
#else
	float buffer[2048];
	const int frames_per_buffer =
		G_N_ELEMENTS(buffer) / audio_format.channels;
	const unsigned frame_size = sizeof(buffer[0]) * audio_format.channels;
#endif

	int prev_section = -1;
	unsigned kbit_rate = 0;

	do {
		if (cmd == DECODE_COMMAND_SEEK) {
			double seek_where = decoder_seek_where(decoder);
			if (0 == ov_time_seek_page(&vf, seek_where)) {
				decoder_command_finished(decoder);
			} else
				decoder_seek_error(decoder);
		}

		int current_section;

#ifdef HAVE_TREMOR
		long nbytes = ov_read(&vf, buffer, sizeof(buffer),
				      VORBIS_BIG_ENDIAN, 2, 1,
				      &current_section);
#else
		float **per_channel;
		long nframes = ov_read_float(&vf, &per_channel,
					     frames_per_buffer,
					     &current_section);
		long nbytes = nframes;
		if (nframes > 0) {
			vorbis_interleave(buffer,
					  (const float*const*)per_channel,
					  nframes, audio_format.channels);
			nbytes *= frame_size;
		}
#endif

		if (nbytes == OV_HOLE) /* bad packet */
			nbytes = 0;
		else if (nbytes <= 0)
			/* break on EOF or other error */
			break;

		if (current_section != prev_section) {
			vi = ov_info(&vf, -1);
			if (vi == NULL) {
				g_warning("ov_info() has failed");
				break;
			}

			if (vi->rate != (long)audio_format.sample_rate ||
			    vi->channels != (int)audio_format.channels) {
				/* we don't support audio format
				   change yet */
				g_warning("audio format change, stopping here");
				break;
			}

			char **comments = ov_comment(&vf, -1)->user_comments;
			vorbis_send_comments(decoder, input_stream, comments);

			struct replay_gain_info rgi;
			if (vorbis_comments_to_replay_gain(&rgi, comments))
				decoder_replay_gain(decoder, &rgi);

			prev_section = current_section;
		}

		long test = ov_bitrate_instant(&vf);
		if (test > 0)
			kbit_rate = test / 1000;

		cmd = decoder_data(decoder, input_stream,
				   buffer, nbytes,
				   kbit_rate);
	} while (cmd != DECODE_COMMAND_STOP);

	ov_clear(&vf);
}

static bool
vorbis_scan_stream(struct input_stream *is,
		   const struct tag_handler *handler, void *handler_ctx)
{
	struct vorbis_input_stream vis;
	OggVorbis_File vf;

	if (!vorbis_is_open(&vis, &vf, NULL, is))
		return false;

	tag_handler_invoke_duration(handler, handler_ctx,
				    (int)(ov_time_total(&vf, -1) + 0.5));

	vorbis_comments_scan(ov_comment(&vf, -1)->user_comments,
			     handler, handler_ctx);

	ov_clear(&vf);
	return true;
}

static const char *const vorbis_suffixes[] = {
	"ogg", "oga", NULL
};

static const char *const vorbis_mime_types[] = {
	"application/ogg",
	"application/x-ogg",
	"audio/ogg",
	"audio/vorbis",
	"audio/vorbis+ogg",
	"audio/x-ogg",
	"audio/x-vorbis",
	"audio/x-vorbis+ogg",
	NULL
};

const struct decoder_plugin vorbis_decoder_plugin = {
	"vorbis",
	nullptr,
	nullptr,
	vorbis_stream_decode,
	nullptr,
	nullptr,
	vorbis_scan_stream,
	nullptr,
	vorbis_suffixes,
	vorbis_mime_types
};