aboutsummaryrefslogtreecommitdiffstats
path: root/src/output/recorder_output_plugin.c
blob: ce69a51167bfb946df061104a4db59c3affeb827 (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
/*
 * Copyright (C) 2003-2010 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 "output_api.h"
#include "encoder_plugin.h"
#include "encoder_list.h"
#include "fd_util.h"

#include <assert.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>

#undef G_LOG_DOMAIN
#define G_LOG_DOMAIN "recorder"

struct recorder_output {
	/**
	 * The configured encoder plugin.
	 */
	struct encoder *encoder;

	/**
	 * The destination file name.
	 */
	const char *path;

	/**
	 * The destination file descriptor.
	 */
	int fd;

	/**
	 * The buffer for encoder_read().
	 */
	char buffer[32768];
};

/**
 * The quark used for GError.domain.
 */
static inline GQuark
recorder_output_quark(void)
{
	return g_quark_from_static_string("recorder_output");
}

static void *
recorder_output_init(G_GNUC_UNUSED const struct audio_format *audio_format,
		     const struct config_param *param, GError **error_r)
{
	struct recorder_output *recorder = g_new(struct recorder_output, 1);
	const char *encoder_name;
	const struct encoder_plugin *encoder_plugin;

	/* read configuration */

	encoder_name = config_get_block_string(param, "encoder", "vorbis");
	encoder_plugin = encoder_plugin_get(encoder_name);
	if (encoder_plugin == NULL) {
		g_set_error(error_r, recorder_output_quark(), 0,
			    "No such encoder: %s", encoder_name);
		return NULL;
	}

	recorder->path = config_get_block_string(param, "path", NULL);
	if (recorder->path == NULL) {
		g_set_error(error_r, recorder_output_quark(), 0,
			    "'path' not configured");
		return NULL;
	}

	/* initialize encoder */

	recorder->encoder = encoder_init(encoder_plugin, param, error_r);
	if (recorder->encoder == NULL)
		return NULL;

	return recorder;
}

static void
recorder_output_finish(void *data)
{
	struct recorder_output *recorder = data;

	encoder_finish(recorder->encoder);
	g_free(recorder);
}

/**
 * Writes pending data from the encoder to the output file.
 */
static bool
recorder_output_encoder_to_file(struct recorder_output *recorder,
			      GError **error_r)
{
	size_t size = 0, position, nbytes;

	assert(recorder->fd >= 0);

	/* read from the encoder */

	size = encoder_read(recorder->encoder, recorder->buffer,
			    sizeof(recorder->buffer));
	if (size == 0)
		return true;

	/* write everything into the file */

	position = 0;
	while (true) {
		nbytes = write(recorder->fd, recorder->buffer + position,
			       size - position);
		if (nbytes > 0) {
			position += (size_t)nbytes;
			if (position >= size)
				return true;
		} else if (nbytes == 0) {
			/* shouldn't happen for files */
			g_set_error(error_r, recorder_output_quark(), 0,
				    "write() returned 0");
			return false;
		} else if (errno != EINTR) {
			g_set_error(error_r, recorder_output_quark(), 0,
				    "Failed to write to '%s': %s",
				    recorder->path, g_strerror(errno));
			return false;
		}
	}
}

static bool
recorder_output_open(void *data, struct audio_format *audio_format,
		     GError **error_r)
{
	struct recorder_output *recorder = data;
	bool success;

	/* create the output file */

	recorder->fd = open_cloexec(recorder->path, O_CREAT|O_WRONLY|O_TRUNC,
				    0666);
	if (recorder->fd < 0) {
		g_set_error(error_r, recorder_output_quark(), 0,
			    "Failed to create '%s': %s",
			    recorder->path, g_strerror(errno));
		return false;
	}

	/* open the encoder */

	success = encoder_open(recorder->encoder, audio_format, error_r);
	if (!success) {
		close(recorder->fd);
		unlink(recorder->path);
		return false;
	}

	return true;
}

static void
recorder_output_close(void *data)
{
	struct recorder_output *recorder = data;

	/* flush the encoder and write the rest to the file */

	if (encoder_flush(recorder->encoder, NULL))
		recorder_output_encoder_to_file(recorder, NULL);

	/* now really close everything */

	encoder_close(recorder->encoder);

	close(recorder->fd);
}

static size_t
recorder_output_play(void *data, const void *chunk, size_t size,
		     GError **error_r)
{
	struct recorder_output *recorder = data;

	return encoder_write(recorder->encoder, chunk, size, error_r) &&
		recorder_output_encoder_to_file(recorder, error_r)
		? size : 0;
}

const struct audio_output_plugin recorder_output_plugin = {
	.name = "recorder",
	.init = recorder_output_init,
	.finish = recorder_output_finish,
	.open = recorder_output_open,
	.close = recorder_output_close,
	.play = recorder_output_play,
};