aboutsummaryrefslogtreecommitdiffstats
path: root/src/encoder/plugins/ShineEncoderPlugin.cxx
blob: c397906d345d9cce3085bcfe651ca80f813e4ed9 (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
/*
 * Copyright (C) 2003-2015 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 "ShineEncoderPlugin.hxx"
#include "config.h"
#include "../EncoderAPI.hxx"
#include "AudioFormat.hxx"
#include "config/ConfigError.hxx"
#include "util/Manual.hxx"
#include "util/NumberParser.hxx"
#include "util/DynamicFifoBuffer.hxx"
#include "util/Error.hxx"
#include "util/Domain.hxx"

extern "C"
{
#include <shine/layer3.h>
}

static constexpr size_t BUFFER_INIT_SIZE = 8192;
static constexpr unsigned CHANNELS = 2;

struct ShineEncoder {
	Encoder encoder;

	AudioFormat audio_format;

	shine_t shine;

	shine_config_t config;

	size_t frame_size;
	size_t input_pos;
	int16_t *stereo[CHANNELS];

	Manual<DynamicFifoBuffer<uint8_t>> output_buffer;

	ShineEncoder():encoder(shine_encoder_plugin){}

	bool Configure(const ConfigBlock &block, Error &error);

	bool Setup(Error &error);

	bool WriteChunk(bool flush);
};

static constexpr Domain shine_encoder_domain("shine_encoder");

inline bool
ShineEncoder::Configure(const ConfigBlock &block, gcc_unused Error &error)
{
	shine_set_config_mpeg_defaults(&config.mpeg);
	config.mpeg.bitr = block.GetBlockValue("bitrate", 128);

	return true;
}

static Encoder *
shine_encoder_init(const ConfigBlock &block, Error &error)
{
	ShineEncoder *encoder = new ShineEncoder();

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

	return &encoder->encoder;
}

static void
shine_encoder_finish(Encoder *_encoder)
{
	ShineEncoder *encoder = (ShineEncoder *)_encoder;

	delete encoder;
}

inline bool
ShineEncoder::Setup(Error &error)
{
	config.mpeg.mode = audio_format.channels == 2 ? STEREO : MONO;
	config.wave.samplerate = audio_format.sample_rate;
	config.wave.channels =
		audio_format.channels == 2 ? PCM_STEREO : PCM_MONO;

	if (shine_check_config(config.wave.samplerate, config.mpeg.bitr) < 0) {
		error.Format(config_domain,
			     "error configuring shine. "
			     "samplerate %d and bitrate %d configuration"
			     " not supported.",
			     config.wave.samplerate,
			     config.mpeg.bitr);

		return false;
	}

	shine = shine_initialise(&config);

	if (!shine) {
		error.Format(config_domain,
			     "error initializing shine.");

		return false;
	}

	frame_size = shine_samples_per_pass(shine);

	return true;
}

static bool
shine_encoder_open(Encoder *_encoder, AudioFormat &audio_format, Error &error)
{
	ShineEncoder *encoder = (ShineEncoder *)_encoder;

	audio_format.format = SampleFormat::S16;
	audio_format.channels = CHANNELS;
	encoder->audio_format = audio_format;

	if (!encoder->Setup(error))
		return false;

	encoder->stereo[0] = new int16_t[encoder->frame_size];
	encoder->stereo[1] = new int16_t[encoder->frame_size];
	/* workaround for bug:
	   https://github.com/savonet/shine/issues/11 */
	encoder->input_pos = SHINE_MAX_SAMPLES + 1;

	encoder->output_buffer.Construct(BUFFER_INIT_SIZE);

	return true;
}

static void
shine_encoder_close(Encoder *_encoder)
{
	ShineEncoder *encoder = (ShineEncoder *)_encoder;

	if (encoder->input_pos > SHINE_MAX_SAMPLES) {
		/* write zero chunk */
		encoder->input_pos = 0;
		encoder->WriteChunk(true);
	}

	shine_close(encoder->shine);
	delete[] encoder->stereo[0];
	delete[] encoder->stereo[1];
	encoder->output_buffer.Destruct();
}

bool
ShineEncoder::WriteChunk(bool flush)
{
	if (flush || input_pos == frame_size) {
		if (flush) {
			/* fill remaining with 0s */
			for (; input_pos < frame_size; input_pos++) {
				stereo[0][input_pos] = stereo[1][input_pos] = 0;
			}
		}

		int written;
		const uint8_t *out =
			shine_encode_buffer(shine, stereo, &written);

		if (written > 0)
			output_buffer->Append(out, written);

		input_pos = 0;
	}

	return true;
}

static bool
shine_encoder_write(Encoder *_encoder,
		    const void *_data, size_t length,
		    gcc_unused Error &error)
{
	ShineEncoder *encoder = (ShineEncoder *)_encoder;
	const int16_t *data = (const int16_t*)_data;
	length /= sizeof(*data) * encoder->audio_format.channels;
	size_t written = 0;

	if (encoder->input_pos > SHINE_MAX_SAMPLES) {
		encoder->input_pos = 0;
	}

	/* write all data to de-interleaved buffers */
	while (written < length) {
		for (;
		     written < length
			     && encoder->input_pos < encoder->frame_size;
		     written++, encoder->input_pos++) {
			const size_t base =
				written * encoder->audio_format.channels;
			encoder->stereo[0][encoder->input_pos] = data[base];
			encoder->stereo[1][encoder->input_pos] = data[base + 1];
		}
		/* write if chunk is filled */
		encoder->WriteChunk(false);
	}

	return true;
}

static bool
shine_encoder_flush(Encoder *_encoder, gcc_unused Error &error)
{
	ShineEncoder *encoder = (ShineEncoder *)_encoder;

	/* flush buffers and flush shine */
	encoder->WriteChunk(true);

	int written;
	const uint8_t *data = shine_flush(encoder->shine, &written);

	if (written > 0)
		encoder->output_buffer->Append(data, written);

	return true;
}

static size_t
shine_encoder_read(Encoder *_encoder, void *dest, size_t length)
{
	ShineEncoder *encoder = (ShineEncoder *)_encoder;

	return encoder->output_buffer->Read((uint8_t *)dest, length);
}

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

const EncoderPlugin shine_encoder_plugin = {
	"shine",
	shine_encoder_init,
	shine_encoder_finish,
	shine_encoder_open,
	shine_encoder_close,
	shine_encoder_flush,
	shine_encoder_flush,
	nullptr,
	nullptr,
	shine_encoder_write,
	shine_encoder_read,
	shine_encoder_get_mime_type,
};