summaryrefslogtreecommitdiff
path: root/src/lrtp.cc
blob: b627c95888dcc1475284639e46207a1ca09ca162 (plain)
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
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set et sw=2 ts=2: */
/***************************************************************************
 *            lrtp.cc
 *
 *  Wed Aug 28 09:50:55 CEST 2013
 *  Copyright 2013 Bent Bisballe Nyeng
 *  deva@aasimon.org
 ****************************************************************************/

/*
 *  This file is part of lrtp.
 *
 *  lrtp 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.
 *
 *  lrtp 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 lrtp; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
 */
#include "lrtp.h"

#include <string>
#include <string.h>
#include <map>
#include <stdio.h>

#include "rtp_profile.h"
#include "rtp_profile_amrwb.h"
#include "rtp_profile_opus.h"
#include "rtp_profile_raw.h"
#include "rtp_profile_l16.h"
#include "rtp_profile_jpeg.h"

#include "srtp.h"

#ifdef __cplusplus
extern "C" {
#endif

typedef std::map<csrc_t, lrtp_profile_t *> profile_map_t;

struct lrtp_t {
  SRTP *srtp;
  csrc_t ssrc;
  unsigned short seq;
  profile_map_t profiles;

  csrc_t next_csrc; // for frame iterator (see get_next_frame)

  std::list<outputframe_t *> framelist;
};

typedef struct {
  lrtp_profile_id_t id;
  struct lrtp_profile_t *(*create)(struct lrtp_t *lrtp, unsigned int csrc,
                                   va_list ap);
} profile_class_t;

static const profile_class_t registered_profiles[] = {
  { PROFILE_AMRWB, profile_amrwb_create },
  { PROFILE_OPUS, profile_opus_create },
  { PROFILE_RAW, profile_raw_create },
  { PROFILE_L16, profile_raw_create },
  { PROFILE_JPEG, profile_jpeg_create },
  { }
};

EXPORT
struct lrtp_t *lrtp_init(const char *key, unsigned int ssrc)
{
  struct lrtp_t *lrtp = new struct lrtp_t;

  lrtp->srtp = new SRTP(key, ssrc);
  lrtp->ssrc = ssrc;
  lrtp->seq = 0;

  return lrtp;
}

EXPORT
void lrtp_close(struct lrtp_t *lrtp)
{
  delete lrtp->srtp;
  delete lrtp;
}

EXPORT
int lrtp_create_profile(struct lrtp_t *lrtp,
                        lrtp_profile_id_t profile_id,
                        unsigned int csrc, ...)
{
  struct lrtp_profile_t *profile = NULL;

  if(lrtp->profiles.find(csrc) != lrtp->profiles.end()) {
    // TODO: CSRC already active
    printf("ERROR: CSRC already active\n");
    return 1;
  }

  va_list ap;
  va_start(ap, csrc);

  const profile_class_t *p = registered_profiles;
  while(p->create) {
    if(p->id == profile_id) {
      profile = p->create(lrtp, csrc, ap);
      profile->process_finished = NULL; // TODO: Figure out a way to set non-profile specific options.
      break;
    }
    p++;
  }

  va_end(ap);

  if(!profile) {
    printf("ERROR: Could not find profile [%d]\n", profile_id);
    return 1;
  }

  profile->id = profile_id;
  profile->lrtp = lrtp;
  profile->csrc = csrc;

  lrtp->profiles[csrc] = profile;
  
  return 0;
}

EXPORT
void lrtp_destroy_profile(struct lrtp_t *lrtp, unsigned int csrc)
{
  if(lrtp->profiles.find(csrc) == lrtp->profiles.end()) {
    // TODO: CSRC not found
    printf("ERROR: CSRC not found\n");
    return;
  }

  struct lrtp_profile_t *profile = lrtp->profiles[csrc];
  profile->destroy(profile);
  lrtp->profiles.erase(csrc);
}

EXPORT
int lrtp_enqueue_frame(struct lrtp_t *lrtp, unsigned int csrc,
                       char *data, size_t size,
                       unsigned long int timestamp)
{
  if(lrtp->profiles.find(csrc) == lrtp->profiles.end()) {
    // TODO: CSRC not found
    printf("ERROR: CSRC not found\n");
    return 1;
  }

  struct lrtp_profile_t *profile = lrtp->profiles[csrc];

  inputframe_t *frame = new inputframe_t();
  frame->data = data;
  frame->size = size;
  frame->offset = 0;
  frame->timestamp = timestamp;

  //printf("lrtp_enqueue_frame: frame->size: %d\n", frame->size);

  profile->framelist.push_back(frame);

  return 0;
}

// Assume we have at least one csrc in the list
static csrc_t get_next_csrc(struct lrtp_t *lrtp)
{
  profile_map_t::iterator i = lrtp->profiles.find(lrtp->next_csrc);

  if(i == lrtp->profiles.end()) {
    // If we haven't got a valid csrc start from the beginning.
    i = lrtp->profiles.begin();
  } else {
    // Otherwise increase the iterator, potentially wrapping.
    i++;
    if(i == lrtp->profiles.end()) i = lrtp->profiles.begin();
  }

  lrtp->next_csrc = i->second->csrc;

  return lrtp->next_csrc;
}

static lrtp_profile_t *get_next_profile(struct lrtp_t *lrtp)
{
  if(lrtp->profiles.size() == 0) return NULL; // No profiles

  csrc_t start = get_next_csrc(lrtp);
  csrc_t cur = start;
  do {
    if(lrtp->profiles.find(cur) == lrtp->profiles.end()) {
      printf("ERROR: This shouldn't happen."
             " Selected profile is not in the list\n");
      break;
    }

    struct lrtp_profile_t *profile = lrtp->profiles.find(cur)->second;
    if(profile->framelist.size()) return profile;

    cur = get_next_csrc(lrtp);

  } while(cur != start);

  return NULL;
}

EXPORT
int lrtp_pack(struct lrtp_t *lrtp, char *packet, size_t maxsize)
{
  //if(!profile) return PACK_MISSING_PROFILE;

  // TODO: Check profile magic word

  struct lrtp_profile_t *profile = get_next_profile(lrtp);

  if(profile == NULL || profile->framelist.size() == 0) return 0;

  inputframe_t *frame = profile->framelist.front();

  RTP rtp;
  rtp.setSSrc(lrtp->ssrc);
  rtp.setTimestamp(frame->timestamp);
  rtp.setSeq(lrtp->seq);
  rtp.addCSrc(profile->csrc);

  int ret = profile->pack(profile,
                          frame->data + frame->offset,
                          frame->size - frame->offset,
                          rtp);

  if(ret < 0) return ret;

  frame->offset += ret;

  if(frame->size == frame->offset) {
    if(profile->process_finished) {
      profile->process_finished(profile, frame->data,
                                profile->process_finished_ptr);
    }
    profile->framelist.pop_front();
    free(frame->data);
    delete frame;
  }

  if(rtp.isValid()) {
    size_t size = rtp.packet(packet, maxsize);
#ifndef SKIP_SRTP
    size = lrtp->srtp->encrypt(packet, size);
#endif/*SKIP_SRTP*/
    lrtp->seq++;
    return size;
  }

  return 0;
}

EXPORT
int lrtp_dequeue_frame(struct lrtp_t *lrtp,
                       char *frame, size_t maxsize,
                       unsigned int *csrc, unsigned int *ts)
{
  if(lrtp->framelist.size() == 0) return 0;

  outputframe_t *f = lrtp->framelist.front();

  if(f->size > maxsize) {
    printf("Buffer is too small\n");
    return -1; // Buffer too small.
  }

  size_t framesize = f->size;
  memcpy(frame, f->data, f->size);

  *csrc = f->csrc;
  *ts = f->ts;

  lrtp->framelist.pop_front();

  //printf("%d frames left in framelist.\n", lrtp->framelist.size());

  free(f->data);
  delete f;

  return framesize;
}

EXPORT
int lrtp_unpack(struct lrtp_t *lrtp, const char *packet, size_t size)
{
  if(!lrtp) return -UNPACK_MISSING_HANDLE;

  // TODO: Check lrtp magic word

  char *pkg = (char*)malloc(size);
  memcpy(pkg, packet, size);

  int ret = 0;

#ifndef SKIP_SRTP
  ret = lrtp->srtp->decrypt(pkg, size);

  if(ret < 0) {
    printf("lrtp_unpack::decrypt error: %d\n", ret);
    free(pkg);
    return -1;
  }

  size = ret;
#endif/*SKIP_SRTP*/

  RTP rtp;
  rtp.fromPacket(pkg, size);
  std::list<csrc_t> csrcs = rtp.getCSrcs();
  if(csrcs.size() == 0) {
    free(pkg);
    return -UNPACK_MISSING_CSRC;
  }
  if(csrcs.size() > 1) {
    free(pkg);
    return -UNPACK_TOO_MANY_CSRCS;
  }

  csrc_t csrc = *csrcs.begin();

  struct lrtp_profile_t *profile = NULL;
  if(lrtp->profiles.find(csrc) == lrtp->profiles.end()) {
    free(pkg);
    return -UNPACK_MISSING_PROFILE;
  }

  profile = lrtp->profiles[csrc];

  std::list<outputframe_t*> framelist;
  ret = profile->unpack(profile, rtp, framelist);

  if(ret < 0) {
    printf("lrtp_unpack::Profile unpack failed: %d\n", ret);
    free(pkg);
    return -1;
  }

  // Make sure all frames in the list have the correct csrc.
  std::list<outputframe_t*>::iterator fi = framelist.begin();
  while(fi != framelist.end()) {
    (*fi)->csrc = csrc;
    fi++;
  }

  lrtp->framelist.splice(lrtp->framelist.end(), framelist);

  free(pkg);

  return ret;
}

#ifdef __cplusplus
}
#endif