aboutsummaryrefslogtreecommitdiffstats
path: root/src/output/httpd_output_plugin.c
blob: e045e8b5a8c21ea011d48e11251d3e8b7f7970da (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
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
/*
 * Copyright (C) 2003-2009 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 "httpd_internal.h"
#include "httpd_client.h"
#include "output_api.h"
#include "encoder_plugin.h"
#include "encoder_list.h"
#include "socket_util.h"
#include "page.h"
#include "icy_server.h"

#include <assert.h>

#include <netinet/in.h>
#include <netdb.h>
#include <unistd.h>
#include <errno.h>

#undef G_LOG_DOMAIN
#define G_LOG_DOMAIN "httpd_output"

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

static void *
httpd_output_init(G_GNUC_UNUSED const struct audio_format *audio_format,
		  const struct config_param *param,
		  GError **error)
{
	struct httpd_output *httpd = g_new(struct httpd_output, 1);
	const char *encoder_name;
	const struct encoder_plugin *encoder_plugin;
	guint port;
	struct sockaddr_in *sin;

	/* read configuration */

	port = config_get_block_unsigned(param, "port", 8000);

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

	if (strcmp(encoder_name, "vorbis") == 0)
		httpd->content_type = "application/x-ogg";
	else if (strcmp(encoder_name, "lame") == 0)
		httpd->content_type = "audio/mpeg";
	else
		httpd->content_type = "application/octet-stream";

	/* initialize listen address */

	sin = (struct sockaddr_in *)&httpd->address;
	memset(sin, 0, sizeof(sin));
	sin->sin_port = htons(port);
	sin->sin_family = AF_INET;
	sin->sin_addr.s_addr = INADDR_ANY;
	httpd->address_size = sizeof(*sin);

	/* initialize metadata */
	httpd->metadata = NULL;

	/* initialize encoder */

	httpd->encoder = encoder_init(encoder_plugin, param, error);
	if (httpd->encoder == NULL)
		return NULL;

	httpd->mutex = g_mutex_new();

	return httpd;
}

static void
httpd_output_finish(void *data)
{
	struct httpd_output *httpd = data;

	if (httpd->metadata)
		page_unref(httpd->metadata);

	encoder_finish(httpd->encoder);
	g_mutex_free(httpd->mutex);
	g_free(httpd);
}

/**
 * Creates a new #httpd_client object and adds it into the
 * httpd_output.clients linked list.
 */
static void
httpd_client_add(struct httpd_output *httpd, int fd)
{
	struct httpd_client *client =
		httpd_client_new(httpd, fd,
				 httpd->encoder->plugin->tag == NULL);

	httpd->clients = g_list_prepend(httpd->clients, client);

	/* pass metadata to client */
	if (httpd->metadata)
		httpd_client_send_metadata(client, httpd->metadata);
}

static gboolean
httpd_listen_in_event(G_GNUC_UNUSED GIOChannel *source,
		      G_GNUC_UNUSED GIOCondition condition,
		      gpointer data)
{
	struct httpd_output *httpd = data;
	int fd;
	struct sockaddr_storage sa;
	socklen_t sa_length = sizeof(sa);

	g_mutex_lock(httpd->mutex);

	/* the listener socket has become readable - a client has
	   connected */

	fd = accept(httpd->fd, (struct sockaddr*)&sa, &sa_length);
	if (fd >= 0)
		httpd_client_add(httpd, fd);
	else if (fd < 0 && errno != EINTR)
		g_warning("accept() failed: %s", g_strerror(errno));

	g_mutex_unlock(httpd->mutex);

	return true;
}

/**
 * Reads data from the encoder (as much as available) and returns it
 * as a new #page object.
 */
static struct page *
httpd_output_read_page(struct httpd_output *httpd)
{
	size_t size = 0, nbytes;

	do {
		nbytes = encoder_read(httpd->encoder, httpd->buffer + size,
				      sizeof(httpd->buffer) - size);
		if (nbytes == 0)
			break;

		size += nbytes;
	} while (size < sizeof(httpd->buffer));

	if (size == 0)
		return NULL;

	return page_new_copy(httpd->buffer, size);
}

static bool
httpd_output_encoder_open(struct httpd_output *httpd,
			  struct audio_format *audio_format,
			  GError **error)
{
	bool success;

	success = encoder_open(httpd->encoder, audio_format, error);
	if (!success)
		return false;

	/* we have to remember the encoder header, i.e. the first
	   bytes of encoder output after opening it, because it has to
	   be sent to every new client */
	httpd->header = httpd_output_read_page(httpd);
	return true;
}

static bool
httpd_output_open(void *data, struct audio_format *audio_format,
		  GError **error)
{
	struct httpd_output *httpd = data;
	bool success;
	GIOChannel *channel;

	g_mutex_lock(httpd->mutex);

	/* create and set up listener socket */

	httpd->fd = socket_bind_listen(PF_INET, SOCK_STREAM, 0,
				       (struct sockaddr *)&httpd->address,
				       httpd->address_size,
				       16, error);
	if (httpd->fd < 0) {
		g_mutex_unlock(httpd->mutex);
		return false;
	}

	channel = g_io_channel_unix_new(httpd->fd);
	httpd->source_id = g_io_add_watch(channel, G_IO_IN,
					  httpd_listen_in_event, httpd);
	g_io_channel_unref(channel);

	/* open the encoder */

	success = httpd_output_encoder_open(httpd, audio_format, error);
	if (!success) {
		g_source_remove(httpd->source_id);
		close(httpd->fd);
		g_mutex_unlock(httpd->mutex);
		return false;
	}

	/* initialize other attributes */

	httpd->clients = NULL;
	httpd->timer = timer_new(audio_format);

	g_mutex_unlock(httpd->mutex);
	return true;
}

static void
httpd_client_delete(gpointer data, G_GNUC_UNUSED gpointer user_data)
{
	struct httpd_client *client = data;

	httpd_client_free(client);
}

static void httpd_output_close(void *data)
{
	struct httpd_output *httpd = data;

	g_mutex_lock(httpd->mutex);

	timer_free(httpd->timer);

	g_list_foreach(httpd->clients, httpd_client_delete, NULL);
	g_list_free(httpd->clients);

	if (httpd->header != NULL)
		page_unref(httpd->header);

	encoder_close(httpd->encoder);

	g_source_remove(httpd->source_id);
	close(httpd->fd);

	g_mutex_unlock(httpd->mutex);
}

void
httpd_output_remove_client(struct httpd_output *httpd,
			   struct httpd_client *client)
{
	assert(httpd != NULL);
	assert(client != NULL);

	httpd->clients = g_list_remove(httpd->clients, client);
}

void
httpd_output_send_header(struct httpd_output *httpd,
			 struct httpd_client *client)
{
	if (httpd->header != NULL)
		httpd_client_send(client, httpd->header);
}

static void
httpd_client_check_queue(gpointer data, G_GNUC_UNUSED gpointer user_data)
{
	struct httpd_client *client = data;

	if (httpd_client_queue_size(client) > 256 * 1024) {
		g_debug("client is too slow, flushing its queue");
		httpd_client_cancel(client);
	}
}

static void
httpd_client_send_page(gpointer data, gpointer user_data)
{
	struct httpd_client *client = data;
	struct page *page = user_data;

	httpd_client_send(client, page);
}

/**
 * Broadcasts a page struct to all clients.
 */
static void
httpd_output_broadcast_page(struct httpd_output *httpd, struct page *page)
{
	assert(page != NULL);

	g_mutex_lock(httpd->mutex);
	g_list_foreach(httpd->clients, httpd_client_send_page, page);
	g_mutex_unlock(httpd->mutex);
}

/**
 * Broadcasts data from the encoder to all clients.
 */
static void
httpd_output_encoder_to_clients(struct httpd_output *httpd)
{
	struct page *page;

	g_mutex_lock(httpd->mutex);
	g_list_foreach(httpd->clients, httpd_client_check_queue, NULL);
	g_mutex_unlock(httpd->mutex);

	while ((page = httpd_output_read_page(httpd)) != NULL) {
		httpd_output_broadcast_page(httpd, page);
		page_unref(page);
	}
}

static bool
httpd_output_encode_and_play(struct httpd_output *httpd,
			     const void *chunk, size_t size, GError **error)
{
	bool success;

	success = encoder_write(httpd->encoder, chunk, size, error);
	if (!success)
		return false;

	httpd_output_encoder_to_clients(httpd);

	return true;
}

static size_t
httpd_output_play(void *data, const void *chunk, size_t size, GError **error)
{
	struct httpd_output *httpd = data;
	bool has_clients;

	g_mutex_lock(httpd->mutex);
	has_clients = httpd->clients != NULL;
	g_mutex_unlock(httpd->mutex);

	if (has_clients) {
		bool success;

		success = httpd_output_encode_and_play(httpd, chunk, size,
						       error);
		if (!success)
			return 0;
	}

	if (!httpd->timer->started)
		timer_start(httpd->timer);
	else
		timer_sync(httpd->timer);
	timer_add(httpd->timer, size);

	return size;
}

static void
httpd_send_metadata(gpointer data, gpointer user_data)
{
	struct httpd_client *client = data;
	struct page *icy_metadata = user_data;

	httpd_client_send_metadata(client, icy_metadata);
}

static void
httpd_output_tag(void *data, const struct tag *tag)
{
	struct httpd_output *httpd = data;

	assert(tag != NULL);

	if (httpd->encoder->plugin->tag != NULL) {
		/* embed encoder tags */

		encoder_tag(httpd->encoder, tag, NULL);
	} else {
		/* use Icy-Metadata */

		if (httpd->metadata != NULL)
			page_unref (httpd->metadata);

		httpd->metadata =
			icy_server_metadata_page(tag, TAG_ITEM_ALBUM,
						 TAG_ITEM_ARTIST,
						 TAG_ITEM_TITLE,
						 TAG_NUM_OF_ITEM_TYPES);
		if (httpd->metadata != NULL) {
			g_mutex_lock(httpd->mutex);
			g_list_foreach(httpd->clients,
				       httpd_send_metadata, httpd->metadata);
			g_mutex_unlock(httpd->mutex);
		}
	}
}

static void
httpd_client_cancel_callback(gpointer data, G_GNUC_UNUSED gpointer user_data)
{
	struct httpd_client *client = data;

	httpd_client_cancel(client);
}

static void
httpd_output_cancel(void *data)
{
	struct httpd_output *httpd = data;

	g_mutex_lock(httpd->mutex);
	g_list_foreach(httpd->clients, httpd_client_cancel_callback, NULL);
	g_mutex_unlock(httpd->mutex);
}

const struct audio_output_plugin httpd_output_plugin = {
	.name = "httpd",
	.init = httpd_output_init,
	.finish = httpd_output_finish,
	.open = httpd_output_open,
	.close = httpd_output_close,
	.send_tag = httpd_output_tag,
	.play = httpd_output_play,
	.cancel = httpd_output_cancel,
};