aboutsummaryrefslogtreecommitdiffstats
path: root/src/input_stream.c
blob: c82788f39aa5ea3862e92b6c90d3f26f92515b78 (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
/*
 * 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 "input_stream.h"
#include "input_registry.h"
#include "input_plugin.h"
#include "input/rewind_input_plugin.h"
#include "uri.h"

#include <glib.h>
#include <assert.h>

static inline GQuark
input_quark(void)
{
	return g_quark_from_static_string("input");
}

struct input_stream *
input_stream_open(const char *url,
		  GMutex *mutex, GCond *cond,
		  GError **error_r)
{
	GError *error = NULL;

	assert(mutex != NULL);
	assert(error_r == NULL || *error_r == NULL);

	input_plugins_for_each_enabled(plugin) {
		struct input_stream *is;

		is = plugin->open(url, mutex, cond, &error);
		if (is != NULL) {
			assert(is->plugin != NULL);
			assert(is->plugin->close != NULL);
			assert(is->plugin->read != NULL);
			assert(is->plugin->eof != NULL);
			assert(!is->seekable || is->plugin->seek != NULL);

			is = input_rewind_open(is);

			return is;
		} else if (error != NULL) {
			g_propagate_error(error_r, error);
			return NULL;
		}
	}

	g_set_error(error_r, input_quark(), 0, "Unrecognized URI");
	return NULL;
}

bool
input_stream_check(struct input_stream *is, GError **error_r)
{
	assert(is != NULL);
	assert(is->plugin != NULL);

	return is->plugin->check == NULL ||
		is->plugin->check(is, error_r);
}

void
input_stream_update(struct input_stream *is)
{
	assert(is != NULL);
	assert(is->plugin != NULL);

	if (is->plugin->update != NULL)
		is->plugin->update(is);
}

void
input_stream_wait_ready(struct input_stream *is)
{
	assert(is != NULL);
	assert(is->mutex != NULL);
	assert(is->cond != NULL);

	while (true) {
		input_stream_update(is);
		if (is->ready)
			break;

		g_cond_wait(is->cond, is->mutex);
	}
}

void
input_stream_lock_wait_ready(struct input_stream *is)
{
	assert(is != NULL);
	assert(is->mutex != NULL);
	assert(is->cond != NULL);

	g_mutex_lock(is->mutex);
	input_stream_wait_ready(is);
	g_mutex_unlock(is->mutex);
}

bool
input_stream_cheap_seeking(const struct input_stream *is)
{
	return is->seekable && (is->uri == NULL || !uri_has_scheme(is->uri));
}

bool
input_stream_seek(struct input_stream *is, goffset offset, int whence,
		  GError **error_r)
{
	assert(is != NULL);
	assert(is->plugin != NULL);

	if (is->plugin->seek == NULL)
		return false;

	return is->plugin->seek(is, offset, whence, error_r);
}

bool
input_stream_lock_seek(struct input_stream *is, goffset offset, int whence,
		       GError **error_r)
{
	assert(is != NULL);
	assert(is->plugin != NULL);

	if (is->plugin->seek == NULL)
		return false;

	if (is->mutex == NULL)
		/* no locking */
		return input_stream_seek(is, offset, whence, error_r);

	g_mutex_lock(is->mutex);
	bool success = input_stream_seek(is, offset, whence, error_r);
	g_mutex_unlock(is->mutex);
	return success;
}

struct tag *
input_stream_tag(struct input_stream *is)
{
	assert(is != NULL);
	assert(is->plugin != NULL);

	return is->plugin->tag != NULL
		? is->plugin->tag(is)
		: NULL;
}

struct tag *
input_stream_lock_tag(struct input_stream *is)
{
	assert(is != NULL);
	assert(is->plugin != NULL);

	if (is->plugin->tag == NULL)
		return false;

	if (is->mutex == NULL)
		/* no locking */
		return input_stream_tag(is);

	g_mutex_lock(is->mutex);
	struct tag *tag = input_stream_tag(is);
	g_mutex_unlock(is->mutex);
	return tag;
}

bool
input_stream_available(struct input_stream *is)
{
	assert(is != NULL);
	assert(is->plugin != NULL);

	return is->plugin->available != NULL
		? is->plugin->available(is)
		: true;
}

size_t
input_stream_read(struct input_stream *is, void *ptr, size_t size,
		  GError **error_r)
{
	assert(ptr != NULL);
	assert(size > 0);

	return is->plugin->read(is, ptr, size, error_r);
}

size_t
input_stream_lock_read(struct input_stream *is, void *ptr, size_t size,
		       GError **error_r)
{
	assert(ptr != NULL);
	assert(size > 0);

	if (is->mutex == NULL)
		/* no locking */
		return input_stream_read(is, ptr, size, error_r);

	g_mutex_lock(is->mutex);
	size_t nbytes = input_stream_read(is, ptr, size, error_r);
	g_mutex_unlock(is->mutex);
	return nbytes;
}

void input_stream_close(struct input_stream *is)
{
	is->plugin->close(is);
}

bool input_stream_eof(struct input_stream *is)
{
	return is->plugin->eof(is);
}

bool
input_stream_lock_eof(struct input_stream *is)
{
	assert(is != NULL);
	assert(is->plugin != NULL);

	if (is->mutex == NULL)
		/* no locking */
		return input_stream_eof(is);

	g_mutex_lock(is->mutex);
	bool eof = input_stream_eof(is);
	g_mutex_unlock(is->mutex);
	return eof;
}