aboutsummaryrefslogtreecommitdiffstats
path: root/src/encoder/VorbisEncoderPlugin.cxx
blob: 6831ca87732eacb8e73649a1be15ac19abde8fac (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
/*
 * Copyright (C) 2003-2012 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 "VorbisEncoderPlugin.hxx"
#include "OggStream.hxx"
#include "OggSerial.hxx"
#include "EncoderAPI.hxx"
#include "tag/Tag.hxx"
#include "AudioFormat.hxx"
#include "ConfigError.hxx"
#include "util/NumberParser.hxx"
#include "util/Error.hxx"
#include "util/Domain.hxx"

#include <vorbis/vorbisenc.h>

#include <glib.h>

#include <assert.h>

struct vorbis_encoder {
	/** the base class */
	Encoder encoder;

	/* configuration */

	float quality;
	int bitrate;

	/* runtime information */

	AudioFormat audio_format;

	vorbis_dsp_state vd;
	vorbis_block vb;
	vorbis_info vi;

	OggStream stream;

	vorbis_encoder():encoder(vorbis_encoder_plugin) {}
};

static constexpr Domain vorbis_encoder_domain("vorbis_encoder");

static bool
vorbis_encoder_configure(struct vorbis_encoder *encoder,
			 const config_param &param, Error &error)
{
	const char *value = param.GetBlockValue("quality");
	if (value != nullptr) {
		/* a quality was configured (VBR) */

		char *endptr;
		encoder->quality = ParseDouble(value, &endptr);

		if (*endptr != '\0' || encoder->quality < -1.0 ||
		    encoder->quality > 10.0) {
			error.Format(config_domain,
				     "quality \"%s\" is not a number in the "
				     "range -1 to 10",
				     value);
			return false;
		}

		if (param.GetBlockValue("bitrate") != nullptr) {
			error.Set(config_domain,
				  "quality and bitrate are both defined");
			return false;
		}
	} else {
		/* a bit rate was configured */

		value = param.GetBlockValue("bitrate");
		if (value == nullptr) {
			error.Set(config_domain,
				  "neither bitrate nor quality defined");
			return false;
		}

		encoder->quality = -2.0;

		char *endptr;
		encoder->bitrate = ParseInt(value, &endptr);
		if (*endptr != '\0' || encoder->bitrate <= 0) {
			error.Set(config_domain,
				  "bitrate should be a positive integer");
			return false;
		}
	}

	return true;
}

static Encoder *
vorbis_encoder_init(const config_param &param, Error &error)
{
	vorbis_encoder *encoder = new vorbis_encoder();

	/* load configuration from "param" */
	if (!vorbis_encoder_configure(encoder, param, error)) {
		/* configuration has failed, roll back and return error */
		delete encoder;
		return nullptr;
	}

	return &encoder->encoder;
}

static void
vorbis_encoder_finish(Encoder *_encoder)
{
	struct vorbis_encoder *encoder = (struct vorbis_encoder *)_encoder;

	/* the real libvorbis/libogg cleanup was already performed by
	   vorbis_encoder_close(), so no real work here */
	delete encoder;
}

static bool
vorbis_encoder_reinit(struct vorbis_encoder *encoder, Error &error)
{
	vorbis_info_init(&encoder->vi);

	if (encoder->quality >= -1.0) {
		/* a quality was configured (VBR) */

		if (0 != vorbis_encode_init_vbr(&encoder->vi,
						encoder->audio_format.channels,
						encoder->audio_format.sample_rate,
						encoder->quality * 0.1)) {
			error.Set(vorbis_encoder_domain,
				  "error initializing vorbis vbr");
			vorbis_info_clear(&encoder->vi);
			return false;
		}
	} else {
		/* a bit rate was configured */

		if (0 != vorbis_encode_init(&encoder->vi,
					    encoder->audio_format.channels,
					    encoder->audio_format.sample_rate, -1.0,
					    encoder->bitrate * 1000, -1.0)) {
			error.Set(vorbis_encoder_domain,
				  "error initializing vorbis encoder");
			vorbis_info_clear(&encoder->vi);
			return false;
		}
	}

	vorbis_analysis_init(&encoder->vd, &encoder->vi);
	vorbis_block_init(&encoder->vd, &encoder->vb);
	encoder->stream.Initialize(GenerateOggSerial());

	return true;
}

static void
vorbis_encoder_headerout(struct vorbis_encoder *encoder, vorbis_comment *vc)
{
	ogg_packet packet, comments, codebooks;

	vorbis_analysis_headerout(&encoder->vd, vc,
				  &packet, &comments, &codebooks);

	encoder->stream.PacketIn(packet);
	encoder->stream.PacketIn(comments);
	encoder->stream.PacketIn(codebooks);
}

static void
vorbis_encoder_send_header(struct vorbis_encoder *encoder)
{
	vorbis_comment vc;

	vorbis_comment_init(&vc);
	vorbis_encoder_headerout(encoder, &vc);
	vorbis_comment_clear(&vc);
}

static bool
vorbis_encoder_open(Encoder *_encoder,
		    AudioFormat &audio_format,
		    Error &error)
{
	struct vorbis_encoder *encoder = (struct vorbis_encoder *)_encoder;

	audio_format.format = SampleFormat::FLOAT;

	encoder->audio_format = audio_format;

	if (!vorbis_encoder_reinit(encoder, error))
		return false;

	vorbis_encoder_send_header(encoder);

	return true;
}

static void
vorbis_encoder_clear(struct vorbis_encoder *encoder)
{
	encoder->stream.Deinitialize();
	vorbis_block_clear(&encoder->vb);
	vorbis_dsp_clear(&encoder->vd);
	vorbis_info_clear(&encoder->vi);
}

static void
vorbis_encoder_close(Encoder *_encoder)
{
	struct vorbis_encoder *encoder = (struct vorbis_encoder *)_encoder;

	vorbis_encoder_clear(encoder);
}

static void
vorbis_encoder_blockout(struct vorbis_encoder *encoder)
{
	while (vorbis_analysis_blockout(&encoder->vd, &encoder->vb) == 1) {
		vorbis_analysis(&encoder->vb, nullptr);
		vorbis_bitrate_addblock(&encoder->vb);

		ogg_packet packet;
		while (vorbis_bitrate_flushpacket(&encoder->vd, &packet))
			encoder->stream.PacketIn(packet);
	}
}

static bool
vorbis_encoder_flush(Encoder *_encoder, gcc_unused Error &error)
{
	struct vorbis_encoder *encoder = (struct vorbis_encoder *)_encoder;

	encoder->stream.Flush();
	return true;
}

static bool
vorbis_encoder_pre_tag(Encoder *_encoder, gcc_unused Error &error)
{
	struct vorbis_encoder *encoder = (struct vorbis_encoder *)_encoder;

	vorbis_analysis_wrote(&encoder->vd, 0);
	vorbis_encoder_blockout(encoder);

	/* reinitialize vorbis_dsp_state and vorbis_block to reset the
	   end-of-stream marker */
	vorbis_block_clear(&encoder->vb);
	vorbis_dsp_clear(&encoder->vd);
	vorbis_analysis_init(&encoder->vd, &encoder->vi);
	vorbis_block_init(&encoder->vd, &encoder->vb);

	encoder->stream.Flush();
	return true;
}

static void
copy_tag_to_vorbis_comment(vorbis_comment *vc, const Tag *tag)
{
	for (unsigned i = 0; i < tag->num_items; i++) {
		const TagItem &item = *tag->items[i];
		char *name = g_ascii_strup(tag_item_names[item.type], -1);
		vorbis_comment_add_tag(vc, name, item.value);
		g_free(name);
	}
}

static bool
vorbis_encoder_tag(Encoder *_encoder, const Tag *tag,
		   gcc_unused Error &error)
{
	struct vorbis_encoder *encoder = (struct vorbis_encoder *)_encoder;
	vorbis_comment comment;

	/* write the vorbis_comment object */

	vorbis_comment_init(&comment);
	copy_tag_to_vorbis_comment(&comment, tag);

	/* reset ogg_stream_state and begin a new stream */

	encoder->stream.Reinitialize(GenerateOggSerial());

	/* send that vorbis_comment to the ogg_stream_state */

	vorbis_encoder_headerout(encoder, &comment);
	vorbis_comment_clear(&comment);

	return true;
}

static void
interleaved_to_vorbis_buffer(float **dest, const float *src,
			     unsigned num_frames, unsigned num_channels)
{
	for (unsigned i = 0; i < num_frames; i++)
		for (unsigned j = 0; j < num_channels; j++)
			dest[j][i] = *src++;
}

static bool
vorbis_encoder_write(Encoder *_encoder,
		     const void *data, size_t length,
		     gcc_unused Error &error)
{
	struct vorbis_encoder *encoder = (struct vorbis_encoder *)_encoder;

	unsigned num_frames = length / encoder->audio_format.GetFrameSize();

	/* this is for only 16-bit audio */

	interleaved_to_vorbis_buffer(vorbis_analysis_buffer(&encoder->vd,
							    num_frames),
				     (const float *)data,
				     num_frames,
				     encoder->audio_format.channels);

	vorbis_analysis_wrote(&encoder->vd, num_frames);
	vorbis_encoder_blockout(encoder);
	return true;
}

static size_t
vorbis_encoder_read(Encoder *_encoder, void *dest, size_t length)
{
	struct vorbis_encoder *encoder = (struct vorbis_encoder *)_encoder;

	return encoder->stream.PageOut(dest, length);
}

static const char *
vorbis_encoder_get_mime_type(gcc_unused Encoder *_encoder)
{
	return  "audio/ogg";
}

const EncoderPlugin vorbis_encoder_plugin = {
	"vorbis",
	vorbis_encoder_init,
	vorbis_encoder_finish,
	vorbis_encoder_open,
	vorbis_encoder_close,
	vorbis_encoder_pre_tag,
	vorbis_encoder_flush,
	vorbis_encoder_pre_tag,
	vorbis_encoder_tag,
	vorbis_encoder_write,
	vorbis_encoder_read,
	vorbis_encoder_get_mime_type,
};