File: format.c

package info (click to toggle)
icecast2 2.4.4-1
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, buster, sid
  • size: 5,712 kB
  • sloc: ansic: 18,819; sh: 4,369; makefile: 250
file content (429 lines) | stat: -rw-r--r-- 13,158 bytes parent folder | download
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
/* Icecast
 *
 * This program is distributed under the GNU General Public License, version 2.
 * A copy of this license is included with this source.
 *
 * Copyright 2000-2004, Jack Moffitt <jack@xiph.org, 
 *                      Michael Smith <msmith@xiph.org>,
 *                      oddsock <oddsock@xiph.org>,
 *                      Karl Heyes <karl@xiph.org>
 *                      and others (see AUTHORS for details).
 */

/* -*- c-basic-offset: 4; -*- */
/* format.c
**
** format plugin implementation
**
*/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <stdlib.h>
#include <string.h>
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif

#include "connection.h"
#include "refbuf.h"

#include "source.h"
#include "format.h"
#include "global.h"
#include "httpp/httpp.h"

#include "format_ogg.h"
#include "format_mp3.h"
#include "format_ebml.h"

#include "logging.h"
#include "stats.h"
#define CATMODULE "format"

#ifdef WIN32
#define strcasecmp stricmp
#define strncasecmp strnicmp
#define snprintf _snprintf
#endif

static int format_prepare_headers (source_t *source, client_t *client);


format_type_t format_get_type (const char *contenttype)
{
    if(strcmp(contenttype, "application/x-ogg") == 0)
        return FORMAT_TYPE_OGG; /* Backwards compatibility */
    else if(strcmp(contenttype, "application/ogg") == 0)
        return FORMAT_TYPE_OGG; /* Now blessed by IANA */
    else if(strcmp(contenttype, "audio/ogg") == 0)
        return FORMAT_TYPE_OGG;
    else if(strcmp(contenttype, "video/ogg") == 0)
        return FORMAT_TYPE_OGG;
    else if(strcmp(contenttype, "audio/webm") == 0)
        return FORMAT_TYPE_EBML;
    else if(strcmp(contenttype, "video/webm") == 0)
        return FORMAT_TYPE_EBML;
    else if(strcmp(contenttype, "audio/x-matroska") == 0)
        return FORMAT_TYPE_EBML;
    else if(strcmp(contenttype, "video/x-matroska") == 0)
        return FORMAT_TYPE_EBML;
    else if(strcmp(contenttype, "video/x-matroska-3d") == 0)
        return FORMAT_TYPE_EBML;
    else
        /* We default to the Generic format handler, which
           can handle many more formats than just mp3.
	   Let's warn that this is not well supported */
	ICECAST_LOG_WARN("Unsupported or legacy stream type: \"%s\". Falling back to generic minimal handler for best effort.", contenttype);
        return FORMAT_TYPE_GENERIC;
}

int format_get_plugin(format_type_t type, source_t *source)
{
    int ret = -1;

    switch (type) {
    case FORMAT_TYPE_OGG:
        ret = format_ogg_get_plugin (source);
        break;
    case FORMAT_TYPE_EBML:
        ret = format_ebml_get_plugin (source);
        break;
    case FORMAT_TYPE_GENERIC:
        ret = format_mp3_get_plugin (source);
        break;
    default:
        break;
    }
    if (ret < 0)
        stats_event (source->mount, "content-type", 
                source->format->contenttype);

    return ret;
}


/* clients need to be start from somewhere in the queue so we will look for
 * a refbuf which has been previously marked as a sync point. 
 */
static void find_client_start (source_t *source, client_t *client)
{
    refbuf_t *refbuf = source->burst_point;

    /* we only want to attempt a burst at connection time, not midstream
     * however streams like theora may not have the most recent page marked as
     * a starting point, so look for one from the burst point */
    if (client->intro_offset == -1 && source->stream_data_tail
            && source->stream_data_tail->sync_point)
        refbuf = source->stream_data_tail;
    else
    {
        size_t size = client->intro_offset;
        refbuf = source->burst_point;
        while (size > 0 && refbuf && refbuf->next)
        {
            size -= refbuf->len;
            refbuf = refbuf->next;
        }
    }

    while (refbuf)
    {
        if (refbuf->sync_point)
        {
            client_set_queue (client, refbuf);
            client->check_buffer = format_advance_queue;
            client->write_to_client = source->format->write_buf_to_client;
            client->intro_offset = -1;
            break;
        }
        refbuf = refbuf->next;
    }
}


static int get_file_data (FILE *intro, client_t *client)
{
    refbuf_t *refbuf = client->refbuf;
    size_t bytes;

    if (intro == NULL || fseek (intro, client->intro_offset, SEEK_SET) < 0)
        return 0;
    bytes = fread (refbuf->data, 1, 4096, intro);
    if (bytes == 0)
        return 0;

    refbuf->len = (unsigned int)bytes;
    return 1;
}


/* call to check the buffer contents for file reading. move the client
 * to right place in the queue at end of file else repeat file if queue
 * is not ready yet.
 */
int format_check_file_buffer (source_t *source, client_t *client)
{
    refbuf_t *refbuf = client->refbuf;

    if (refbuf == NULL)
    {
        /* client refers to no data, must be from a move */
        if (source->client)
        {
            find_client_start (source, client);
            return -1;
        }
        /* source -> file fallback, need a refbuf for data */
        refbuf = refbuf_new (PER_CLIENT_REFBUF_SIZE);
        client->refbuf = refbuf;
        client->pos = refbuf->len;
        client->intro_offset = 0;
    }
    if (client->pos == refbuf->len)
    {
        if (get_file_data (source->intro_file, client))
        {
            client->pos = 0;
            client->intro_offset += refbuf->len;
        }
        else
        {
            if (source->stream_data_tail)
            {
                /* better find the right place in queue for this client */
                client_set_queue (client, NULL);
                find_client_start (source, client);
            }
            else
                client->intro_offset = 0;  /* replay intro file */
            return -1;
        }
    }
    return 0;
}


/* call this to verify that the HTTP data has been sent and if so setup
 * callbacks to the appropriate format functions
 */
int format_check_http_buffer (source_t *source, client_t *client)
{
    refbuf_t *refbuf = client->refbuf;

    if (refbuf == NULL)
        return -1;

    if (client->respcode == 0)
    {
        ICECAST_LOG_DEBUG("processing pending client headers");

        if (format_prepare_headers (source, client) < 0)
        {
            ICECAST_LOG_ERROR("internal problem, dropping client");
            client->con->error = 1;
            return -1;
        }
        client->respcode = 200;
        stats_event_inc (NULL, "listeners");
        stats_event_inc (NULL, "listener_connections");
        stats_event_inc (source->mount, "listener_connections");
    }

    if (client->pos == refbuf->len)
    {
        client->write_to_client = source->format->write_buf_to_client;
        client->check_buffer = format_check_file_buffer;
        client->intro_offset = 0;
        client->pos = refbuf->len = 4096;
        return -1;
    }
    return 0;
}


int format_generic_write_to_client (client_t *client)
{
    refbuf_t *refbuf = client->refbuf;
    int ret;
    const char *buf = refbuf->data + client->pos;
    unsigned int len = refbuf->len - client->pos;

    ret = client_send_bytes (client, buf, len);

    if (ret > 0)
        client->pos += ret;

    return ret;
}


/* This is the commonly used for source streams, here we just progress to
 * the next buffer in the queue if there is no more left to be written from 
 * the existing buffer.
 */
int format_advance_queue (source_t *source, client_t *client)
{
    refbuf_t *refbuf = client->refbuf;

    if (refbuf == NULL)
        return -1;

    if (refbuf->next == NULL && client->pos == refbuf->len)
        return -1;

    /* move to the next buffer if we have finished with the current one */
    if (refbuf->next && client->pos == refbuf->len)
    {
        client_set_queue (client, refbuf->next);
        refbuf = client->refbuf;
    }
    return 0;
}


static int format_prepare_headers (source_t *source, client_t *client)
{
    unsigned remaining;
    char *ptr;
    int bytes;
    int bitrate_filtered = 0;
    avl_node *node;

    remaining = client->refbuf->len;
    ptr = client->refbuf->data;
    client->respcode = 200;

    bytes = util_http_build_header(ptr, remaining, 0, 0, 200, NULL, source->format->contenttype, NULL, NULL, source);
    if (bytes <= 0) {
        ICECAST_LOG_ERROR("Dropping client as we can not build response headers.");
        client_send_500(client, "Header generation failed.");
        return -1;
    } else if ((bytes + 1024) >= remaining) { /* we don't know yet how much to follow but want at least 1kB free space */
        void *new_ptr = realloc(ptr, bytes + 1024);
        if (new_ptr) {
            ICECAST_LOG_DEBUG("Client buffer reallocation succeeded.");
            client->refbuf->data = ptr = new_ptr;
            client->refbuf->len = remaining = bytes + 1024;
            bytes = util_http_build_header(ptr, remaining, 0, 0, 200, NULL, source->format->contenttype, NULL, NULL, source);
            if (bytes <= 0 || bytes >= remaining) {
                ICECAST_LOG_ERROR("Dropping client as we can not build response headers.");
                client_send_500(client, "Header generation failed.");
                return -1;
            }
        } else {
            ICECAST_LOG_ERROR("Client buffer reallocation failed. Dropping client.");
            client_send_500(client, "Buffer reallocation failed.");
            return -1;
        }
    }

    remaining -= bytes;
    ptr += bytes;

    /* iterate through source http headers and send to client */
    avl_tree_rlock(source->parser->vars);
    node = avl_get_first(source->parser->vars);
    while (node)
    {
        int next = 1;
        http_var_t *var = (http_var_t *)node->key;
        bytes = 0;
        if (!strcasecmp(var->name, "ice-audio-info"))
        {
            /* convert ice-audio-info to icy-br */
            char *brfield = NULL;
            unsigned int bitrate;

            if (bitrate_filtered == 0)
                brfield = strstr(var->value, "bitrate=");
            if (brfield && sscanf (brfield, "bitrate=%u", &bitrate))
            {           
                bytes = snprintf (ptr, remaining, "icy-br:%u\r\n", bitrate);
                next = 0;
                bitrate_filtered = 1;
            }
            else
                /* show ice-audio_info header as well because of relays */
                bytes = snprintf (ptr, remaining, "%s: %s\r\n", var->name, var->value);
        }
        else
        {
            if (strcasecmp(var->name, "ice-password") &&
                strcasecmp(var->name, "icy-metaint"))
            {
		if (!strcasecmp(var->name, "ice-name"))
		{
		    ice_config_t *config;
		    mount_proxy *mountinfo;

		    config = config_get_config();
		    mountinfo = config_find_mount (config, source->mount, MOUNT_TYPE_NORMAL);

		    if (mountinfo && mountinfo->stream_name)
		        bytes = snprintf (ptr, remaining, "icy-name:%s\r\n", mountinfo->stream_name);
                    else
		        bytes = snprintf (ptr, remaining, "icy-name:%s\r\n", var->value);

                    config_release_config();
		}
                else if (!strncasecmp("ice-", var->name, 4))
                {
                    if (!strcasecmp("ice-public", var->name))
                        bytes = snprintf (ptr, remaining, "icy-pub:%s\r\n", var->value);
                    else
                        if (!strcasecmp ("ice-bitrate", var->name))
                            bytes = snprintf (ptr, remaining, "icy-br:%s\r\n", var->value);
                        else
                            bytes = snprintf (ptr, remaining, "icy%s:%s\r\n",
                                    var->name + 3, var->value);
                }
                else
                    if (!strncasecmp("icy-", var->name, 4))
                    {
                        bytes = snprintf (ptr, remaining, "icy%s:%s\r\n",
                                var->name + 3, var->value);
                    }
            }
        }

        if (bytes < 0 || bytes >= remaining) {
            avl_tree_unlock(source->parser->vars);
            ICECAST_LOG_ERROR("Can not allocate headers for client %p", client);
            client_send_500(client, "Header generation failed.");
            return -1;
        }

        remaining -= bytes;
        ptr += bytes;
        if (next)
            node = avl_get_next(node);
    }
    avl_tree_unlock(source->parser->vars);

    bytes = snprintf (ptr, remaining, "\r\n");
    if (bytes < 0 || bytes >= remaining) {
        ICECAST_LOG_ERROR("Can not allocate headers for client %p", client);
        client_send_500(client, "Header generation failed.");
        return -1;
    }
    remaining -= bytes;
    ptr += bytes;

    client->refbuf->len -= remaining;
    if (source->format->create_client_data)
        if (source->format->create_client_data (source, client) < 0) {
            ICECAST_LOG_ERROR("Client format header generation failed. "
                "(Likely not enough or wrong source data) Dropping client.");
            client->respcode = 500;
            return -1;
        }
    return 0;
}