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rtmpcrypt.c
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1 /*
2  * RTMPE network protocol
3  * Copyright (c) 2008-2009 Andrej Stepanchuk
4  * Copyright (c) 2009-2010 Howard Chu
5  * Copyright (c) 2012 Samuel Pitoiset
6  *
7  * This file is part of FFmpeg.
8  *
9  * FFmpeg is free software; you can redistribute it and/or
10  * modify it under the terms of the GNU Lesser General Public
11  * License as published by the Free Software Foundation; either
12  * version 2.1 of the License, or (at your option) any later version.
13  *
14  * FFmpeg is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17  * Lesser General Public License for more details.
18  *
19  * You should have received a copy of the GNU Lesser General Public
20  * License along with FFmpeg; if not, write to the Free Software
21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22  */
23 
24 /**
25  * @file
26  * RTMPE protocol
27  */
28 
29 #include "libavutil/blowfish.h"
30 #include "libavutil/intreadwrite.h"
31 #include "libavutil/opt.h"
32 #include "libavutil/rc4.h"
33 #include "libavutil/xtea.h"
34 
35 #include "internal.h"
36 #include "rtmp.h"
37 #include "rtmpdh.h"
38 #include "rtmpcrypt.h"
39 #include "url.h"
40 
41 /* protocol handler context */
42 typedef struct RTMPEContext {
43  const AVClass *class;
44  URLContext *stream; ///< TCP stream
45  FF_DH *dh; ///< Diffie-Hellman context
46  struct AVRC4 key_in; ///< RC4 key used for decrypt data
47  struct AVRC4 key_out; ///< RC4 key used for encrypt data
48  int handshaked; ///< flag indicating when the handshake is performed
49  int tunneling; ///< use a HTTP connection (RTMPTE)
50 } RTMPEContext;
51 
52 static const uint8_t rtmpe8_keys[16][16] = {
53  { 0xb2, 0x34, 0xf0, 0xbf, 0x1f, 0x08, 0xd9, 0x11,
54  0x95, 0xb7, 0xdf, 0xcc, 0x32, 0xe7, 0x8d, 0x74 },
55  { 0xb6, 0x5e, 0x6a, 0x08, 0x0e, 0x09, 0x43, 0x17,
56  0xb8, 0x5a, 0xf0, 0x6e, 0xe2, 0x39, 0x5a, 0xfe },
57  { 0x6f, 0x95, 0x10, 0x7b, 0x21, 0x05, 0xce, 0x76,
58  0x3a, 0xa7, 0x88, 0x23, 0xa1, 0x49, 0x01, 0x44 },
59  { 0x17, 0xf3, 0x43, 0xa9, 0xb2, 0x1b, 0xf1, 0xeb,
60  0xee, 0xa5, 0x91, 0xa6, 0x39, 0x63, 0xf3, 0x17 },
61  { 0x0a, 0xe0, 0x30, 0x7a, 0x2c, 0xe2, 0x29, 0xb5,
62  0xa5, 0xae, 0x87, 0xa0, 0xac, 0x79, 0xcb, 0xc0 },
63  { 0x23, 0x0c, 0xce, 0xbd, 0xff, 0xde, 0xeb, 0x2f,
64  0x16, 0xae, 0xfa, 0x1c, 0x9d, 0x23, 0x23, 0x11 },
65  { 0x7b, 0x3f, 0xdd, 0x55, 0x2e, 0xe6, 0xe7, 0x77,
66  0x99, 0xc4, 0xb8, 0x9b, 0xe4, 0x1e, 0x48, 0xc9 },
67  { 0xb4, 0xb6, 0x7b, 0x40, 0x36, 0x91, 0xe8, 0x71,
68  0x55, 0xbf, 0xae, 0xa7, 0x39, 0xb8, 0x33, 0xca },
69  { 0xc3, 0xbd, 0xf6, 0xfc, 0x97, 0x36, 0x3c, 0xb6,
70  0x25, 0xf8, 0xe4, 0x7c, 0xb2, 0x59, 0xd9, 0x04 },
71  { 0xfd, 0x91, 0xe0, 0x28, 0x4c, 0x4c, 0x95, 0x41,
72  0x00, 0xdb, 0xb7, 0x7f, 0xf8, 0x66, 0xa0, 0xe3 },
73  { 0x76, 0x5b, 0x84, 0x57, 0x03, 0x1b, 0x25, 0x4f,
74  0xcd, 0x5b, 0xd4, 0x46, 0x29, 0x0d, 0xc3, 0xa2 },
75  { 0xf8, 0xee, 0xcc, 0x0a, 0x46, 0xb5, 0x55, 0xda,
76  0x52, 0x34, 0x47, 0x03, 0x3b, 0x71, 0x63, 0x58 },
77  { 0xdc, 0x75, 0x20, 0xb8, 0xee, 0x1f, 0x5f, 0xa7,
78  0xe8, 0x68, 0x42, 0xd8, 0xcc, 0x44, 0x2a, 0xa7 },
79  { 0x9e, 0x6e, 0xcf, 0x07, 0x25, 0x7b, 0x6d, 0xa1,
80  0x6c, 0xae, 0xa7, 0x9f, 0x29, 0x56, 0x2f, 0xd9 },
81  { 0xe4, 0xea, 0xb1, 0xfe, 0xe1, 0x3c, 0x8c, 0x8c,
82  0xa7, 0x64, 0x00, 0x4e, 0x2a, 0x7c, 0x38, 0x6a },
83  { 0x27, 0x94, 0x3a, 0x89, 0xa2, 0x13, 0x30, 0xcc,
84  0x5b, 0x38, 0x06, 0xf1, 0x27, 0xf9, 0x29, 0xa8 }
85 };
86 
87 static const uint8_t rtmpe9_keys[16][24] = {
88  { 0x79, 0x34, 0x77, 0x4c, 0x67, 0xd1, 0x38, 0x3a, 0xdf, 0xb3, 0x56, 0xbe,
89  0x8b, 0x7b, 0xd0, 0x24, 0x38, 0xe0, 0x73, 0x58, 0x41, 0x5d, 0x69, 0x67, },
90  { 0x46, 0xf6, 0xb4, 0xcc, 0x01, 0x93, 0xe3, 0xa1, 0x9e, 0x7d, 0x3c, 0x65,
91  0x55, 0x86, 0xfd, 0x09, 0x8f, 0xf7, 0xb3, 0xc4, 0x6f, 0x41, 0xca, 0x5c, },
92  { 0x1a, 0xe7, 0xe2, 0xf3, 0xf9, 0x14, 0x79, 0x94, 0xc0, 0xd3, 0x97, 0x43,
93  0x08, 0x7b, 0xb3, 0x84, 0x43, 0x2f, 0x9d, 0x84, 0x3f, 0x21, 0x01, 0x9b, },
94  { 0xd3, 0xe3, 0x54, 0xb0, 0xf7, 0x1d, 0xf6, 0x2b, 0x5a, 0x43, 0x4d, 0x04,
95  0x83, 0x64, 0x3e, 0x0d, 0x59, 0x2f, 0x61, 0xcb, 0xb1, 0x6a, 0x59, 0x0d, },
96  { 0xc8, 0xc1, 0xe9, 0xb8, 0x16, 0x56, 0x99, 0x21, 0x7b, 0x5b, 0x36, 0xb7,
97  0xb5, 0x9b, 0xdf, 0x06, 0x49, 0x2c, 0x97, 0xf5, 0x95, 0x48, 0x85, 0x7e, },
98  { 0xeb, 0xe5, 0xe6, 0x2e, 0xa4, 0xba, 0xd4, 0x2c, 0xf2, 0x16, 0xe0, 0x8f,
99  0x66, 0x23, 0xa9, 0x43, 0x41, 0xce, 0x38, 0x14, 0x84, 0x95, 0x00, 0x53, },
100  { 0x66, 0xdb, 0x90, 0xf0, 0x3b, 0x4f, 0xf5, 0x6f, 0xe4, 0x9c, 0x20, 0x89,
101  0x35, 0x5e, 0xd2, 0xb2, 0xc3, 0x9e, 0x9f, 0x7f, 0x63, 0xb2, 0x28, 0x81, },
102  { 0xbb, 0x20, 0xac, 0xed, 0x2a, 0x04, 0x6a, 0x19, 0x94, 0x98, 0x9b, 0xc8,
103  0xff, 0xcd, 0x93, 0xef, 0xc6, 0x0d, 0x56, 0xa7, 0xeb, 0x13, 0xd9, 0x30, },
104  { 0xbc, 0xf2, 0x43, 0x82, 0x09, 0x40, 0x8a, 0x87, 0x25, 0x43, 0x6d, 0xe6,
105  0xbb, 0xa4, 0xb9, 0x44, 0x58, 0x3f, 0x21, 0x7c, 0x99, 0xbb, 0x3f, 0x24, },
106  { 0xec, 0x1a, 0xaa, 0xcd, 0xce, 0xbd, 0x53, 0x11, 0xd2, 0xfb, 0x83, 0xb6,
107  0xc3, 0xba, 0xab, 0x4f, 0x62, 0x79, 0xe8, 0x65, 0xa9, 0x92, 0x28, 0x76, },
108  { 0xc6, 0x0c, 0x30, 0x03, 0x91, 0x18, 0x2d, 0x7b, 0x79, 0xda, 0xe1, 0xd5,
109  0x64, 0x77, 0x9a, 0x12, 0xc5, 0xb1, 0xd7, 0x91, 0x4f, 0x96, 0x4c, 0xa3, },
110  { 0xd7, 0x7c, 0x2a, 0xbf, 0xa6, 0xe7, 0x85, 0x7c, 0x45, 0xad, 0xff, 0x12,
111  0x94, 0xd8, 0xde, 0xa4, 0x5c, 0x3d, 0x79, 0xa4, 0x44, 0x02, 0x5d, 0x22, },
112  { 0x16, 0x19, 0x0d, 0x81, 0x6a, 0x4c, 0xc7, 0xf8, 0xb8, 0xf9, 0x4e, 0xcd,
113  0x2c, 0x9e, 0x90, 0x84, 0xb2, 0x08, 0x25, 0x60, 0xe1, 0x1e, 0xae, 0x18, },
114  { 0xe9, 0x7c, 0x58, 0x26, 0x1b, 0x51, 0x9e, 0x49, 0x82, 0x60, 0x61, 0xfc,
115  0xa0, 0xa0, 0x1b, 0xcd, 0xf5, 0x05, 0xd6, 0xa6, 0x6d, 0x07, 0x88, 0xa3, },
116  { 0x2b, 0x97, 0x11, 0x8b, 0xd9, 0x4e, 0xd9, 0xdf, 0x20, 0xe3, 0x9c, 0x10,
117  0xe6, 0xa1, 0x35, 0x21, 0x11, 0xf9, 0x13, 0x0d, 0x0b, 0x24, 0x65, 0xb2, },
118  { 0x53, 0x6a, 0x4c, 0x54, 0xac, 0x8b, 0x9b, 0xb8, 0x97, 0x29, 0xfc, 0x60,
119  0x2c, 0x5b, 0x3a, 0x85, 0x68, 0xb5, 0xaa, 0x6a, 0x44, 0xcd, 0x3f, 0xa7, },
120 };
121 
123 {
124  RTMPEContext *rt = h->priv_data;
125  int offset, ret;
126 
127  if (!(rt->dh = ff_dh_init(1024)))
128  return AVERROR(ENOMEM);
129 
130  offset = ff_rtmp_calc_digest_pos(buf, 768, 632, 8);
131  if (offset < 0)
132  return offset;
133 
134  /* generate a Diffie-Hellmann public key */
135  if ((ret = ff_dh_generate_public_key(rt->dh)) < 0)
136  return ret;
137 
138  /* write the public key into the handshake buffer */
139  if ((ret = ff_dh_write_public_key(rt->dh, buf + offset, 128)) < 0)
140  return ret;
141 
142  return 0;
143 }
144 
146  const uint8_t *clientdata, int type)
147 {
148  RTMPEContext *rt = h->priv_data;
149  uint8_t secret_key[128], digest[32];
150  int server_pos, client_pos;
151  int ret;
152 
153  if (type) {
154  if ((server_pos = ff_rtmp_calc_digest_pos(serverdata, 1532, 632, 772)) < 0)
155  return server_pos;
156  } else {
157  if ((server_pos = ff_rtmp_calc_digest_pos(serverdata, 768, 632, 8)) < 0)
158  return server_pos;
159  }
160 
161  if ((client_pos = ff_rtmp_calc_digest_pos(clientdata, 768, 632, 8)) < 0)
162  return client_pos;
163 
164  /* compute the shared secret secret in order to compute RC4 keys */
165  if ((ret = ff_dh_compute_shared_secret_key(rt->dh, serverdata + server_pos,
166  128, secret_key, sizeof(secret_key))) < 0)
167  return ret;
168 
169  /* set output key */
170  if ((ret = ff_rtmp_calc_digest(serverdata + server_pos, 128, 0, secret_key,
171  128, digest)) < 0)
172  return ret;
173  av_rc4_init(&rt->key_out, digest, 16 * 8, 1);
174 
175  /* set input key */
176  if ((ret = ff_rtmp_calc_digest(clientdata + client_pos, 128, 0, secret_key,
177  128, digest)) < 0)
178  return ret;
179  av_rc4_init(&rt->key_in, digest, 16 * 8, 1);
180 
181  return 0;
182 }
183 
184 static void rtmpe8_sig(const uint8_t *in, uint8_t *out, int key_id)
185 {
186  struct AVXTEA ctx;
187 
188  av_xtea_le_init(&ctx, rtmpe8_keys[key_id]);
189  av_xtea_le_crypt(&ctx, out, in, 1, NULL, 0);
190 }
191 
192 static void rtmpe9_sig(const uint8_t *in, uint8_t *out, int key_id)
193 {
194  struct AVBlowfish ctx;
195  uint32_t xl, xr;
196 
197  xl = AV_RL32(in);
198  xr = AV_RL32(in + 4);
199 
200  av_blowfish_init(&ctx, rtmpe9_keys[key_id], 24);
201  av_blowfish_crypt_ecb(&ctx, &xl, &xr, 0);
202 
203  AV_WL32(out, xl);
204  AV_WL32(out + 4, xr);
205 }
206 
207 void ff_rtmpe_encrypt_sig(URLContext *h, uint8_t *sig, const uint8_t *digest,
208  int type)
209 {
210  int i;
211 
212  for (i = 0; i < 32; i += 8) {
213  if (type == 8) {
214  /* RTMPE type 8 uses XTEA on the signature */
215  rtmpe8_sig(sig + i, sig + i, digest[i] % 15);
216  } else if (type == 9) {
217  /* RTMPE type 9 uses Blowfish on the signature */
218  rtmpe9_sig(sig + i, sig + i, digest[i] % 15);
219  }
220  }
221 }
222 
224 {
225  RTMPEContext *rt = h->priv_data;
227 
228  /* skip past 1536 bytes of the RC4 bytestream */
229  av_rc4_crypt(&rt->key_in, buf, NULL, sizeof(buf), NULL, 1);
230  av_rc4_crypt(&rt->key_out, buf, NULL, sizeof(buf), NULL, 1);
231 
232  /* the next requests will be encrypted using RC4 keys */
233  rt->handshaked = 1;
234 
235  return 0;
236 }
237 
239 {
240  RTMPEContext *rt = h->priv_data;
241 
242  ff_dh_free(rt->dh);
243  ffurl_close(rt->stream);
244 
245  return 0;
246 }
247 
248 static int rtmpe_open(URLContext *h, const char *uri, int flags)
249 {
250  RTMPEContext *rt = h->priv_data;
251  char host[256], url[1024];
252  int ret, port;
253 
254  av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &port, NULL, 0, uri);
255 
256  if (rt->tunneling) {
257  if (port < 0)
258  port = 80;
259  ff_url_join(url, sizeof(url), "ffrtmphttp", NULL, host, port, NULL);
260  } else {
261  if (port < 0)
262  port = 1935;
263  ff_url_join(url, sizeof(url), "tcp", NULL, host, port, NULL);
264  }
265 
266  /* open the tcp or ffrtmphttp connection */
267  if ((ret = ffurl_open_whitelist(&rt->stream, url, AVIO_FLAG_READ_WRITE,
269  h->protocol_whitelist, h->protocol_blacklist, h)) < 0) {
270  rtmpe_close(h);
271  return ret;
272  }
273 
274  return 0;
275 }
276 
277 static int rtmpe_read(URLContext *h, uint8_t *buf, int size)
278 {
279  RTMPEContext *rt = h->priv_data;
280  int ret;
281 
282  rt->stream->flags |= h->flags & AVIO_FLAG_NONBLOCK;
283  ret = ffurl_read(rt->stream, buf, size);
285 
286  if (ret < 0 && ret != AVERROR_EOF)
287  return ret;
288 
289  if (rt->handshaked && ret > 0) {
290  /* decrypt data received by the server */
291  av_rc4_crypt(&rt->key_in, buf, buf, ret, NULL, 1);
292  }
293 
294  return ret;
295 }
296 
297 static int rtmpe_write(URLContext *h, const uint8_t *buf, int size)
298 {
299  RTMPEContext *rt = h->priv_data;
300  int ret;
301 
302  if (rt->handshaked) {
303  /* encrypt data to send to the server */
304  av_rc4_crypt(&rt->key_out, buf, buf, size, NULL, 1);
305  }
306 
307  if ((ret = ffurl_write(rt->stream, buf, size)) < 0)
308  return ret;
309 
310  return size;
311 }
312 
313 #define OFFSET(x) offsetof(RTMPEContext, x)
314 #define DEC AV_OPT_FLAG_DECODING_PARAM
315 
316 static const AVOption ffrtmpcrypt_options[] = {
317  {"ffrtmpcrypt_tunneling", "Use a HTTP tunneling connection (RTMPTE).", OFFSET(tunneling), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, DEC},
318  { NULL },
319 };
320 
321 static const AVClass ffrtmpcrypt_class = {
322  .class_name = "ffrtmpcrypt",
323  .item_name = av_default_item_name,
324  .option = ffrtmpcrypt_options,
325  .version = LIBAVUTIL_VERSION_INT,
326 };
327 
329  .name = "ffrtmpcrypt",
330  .url_open = rtmpe_open,
331  .url_read = rtmpe_read,
332  .url_write = rtmpe_write,
333  .url_close = rtmpe_close,
334  .priv_data_size = sizeof(RTMPEContext),
336  .priv_data_class = &ffrtmpcrypt_class,
337 };
void av_url_split(char *proto, int proto_size, char *authorization, int authorization_size, char *hostname, int hostname_size, int *port_ptr, char *path, int path_size, const char *url)
Split a URL string into components.
Definition: utils.c:4461
int tunneling
use a HTTP connection (RTMPTE)
Definition: rtmpcrypt.c:49
#define NULL
Definition: coverity.c:32
int ffurl_open_whitelist(URLContext **puc, const char *filename, int flags, const AVIOInterruptCB *int_cb, AVDictionary **options, const char *whitelist, const char *blacklist, URLContext *parent)
Create an URLContext for accessing to the resource indicated by url, and open it. ...
Definition: avio.c:309
#define URL_PROTOCOL_FLAG_NETWORK
Definition: url.h:34
AVOption.
Definition: opt.h:246
int ff_dh_write_public_key(FF_DH *dh, uint8_t *pub_key, int pub_key_len)
Write the public key into the given buffer.
Definition: rtmpdh.c:322
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
int ffurl_write(URLContext *h, const unsigned char *buf, int size)
Write size bytes from buf to the resource accessed by h.
Definition: avio.c:421
AVIOInterruptCB interrupt_callback
Definition: url.h:47
static const uint8_t rtmpe9_keys[16][24]
Definition: rtmpcrypt.c:87
int ff_dh_compute_shared_secret_key(FF_DH *dh, const uint8_t *pub_key, int pub_key_len, uint8_t *secret_key, int secret_key_len)
Compute the shared secret key from the private FF_DH value and the other party's public value...
Definition: rtmpdh.c:338
const URLProtocol ff_ffrtmpcrypt_protocol
Definition: rtmpcrypt.c:328
int flags
Definition: url.h:43
URLContext * stream
TCP stream.
Definition: rtmpcrypt.c:44
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:72
uint8_t
int ff_dh_generate_public_key(FF_DH *dh)
Generate a public key.
Definition: rtmpdh.c:296
AVOptions.
Definition: rc4.h:32
void av_rc4_crypt(AVRC4 *r, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt)
Encrypts / decrypts using the RC4 algorithm.
Definition: rc4.c:54
int ff_rtmpe_compute_secret_key(URLContext *h, const uint8_t *serverdata, const uint8_t *clientdata, int type)
Compute the shared secret key and initialize the RC4 encryption.
Definition: rtmpcrypt.c:145
static int flags
Definition: log.c:57
#define AVERROR_EOF
End of file.
Definition: error.h:55
ptrdiff_t size
Definition: opengl_enc.c:101
int ff_rtmpe_gen_pub_key(URLContext *h, uint8_t *buf)
Initialize the Diffie-Hellmann context and generate the public key.
Definition: rtmpcrypt.c:122
int ff_rtmp_calc_digest_pos(const uint8_t *buf, int off, int mod_val, int add_val)
Calculate digest position for RTMP handshake packets.
Definition: rtmpproto.c:1008
int handshaked
flag indicating when the handshake is performed
Definition: rtmpcrypt.c:48
const char * protocol_whitelist
Definition: url.h:49
av_default_item_name
#define AVERROR(e)
Definition: error.h:43
av_cold void av_blowfish_init(AVBlowfish *ctx, const uint8_t *key, int key_len)
Initialize an AVBlowfish context.
Definition: blowfish.c:309
#define OFFSET(x)
Definition: rtmpcrypt.c:313
static int rtmpe_read(URLContext *h, uint8_t *buf, int size)
Definition: rtmpcrypt.c:277
static const uint8_t offset[127][2]
Definition: vf_spp.c:92
static int rtmpe_write(URLContext *h, const uint8_t *buf, int size)
Definition: rtmpcrypt.c:297
Public header for libavutil XTEA algorithm.
void ff_dh_free(FF_DH *dh)
Free a Diffie-Hellmann context.
void av_blowfish_crypt_ecb(AVBlowfish *ctx, uint32_t *xl, uint32_t *xr, int decrypt)
Encrypt or decrypt a buffer using a previously initialized context.
Definition: blowfish.c:344
int ff_url_join(char *str, int size, const char *proto, const char *authorization, const char *hostname, int port, const char *fmt,...)
Definition: url.c:36
const char * protocol_blacklist
Definition: url.h:50
#define AVIO_FLAG_NONBLOCK
Use non-blocking mode.
Definition: avio.h:625
void av_xtea_le_init(AVXTEA *ctx, const uint8_t key[16])
Initialize an AVXTEA context.
Definition: xtea.c:50
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(constint16_t *) pi >>8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(constint32_t *) pi >>24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(constfloat *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(constfloat *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(constfloat *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(constdouble *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(constdouble *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(constdouble *) pi *(1U<< 31))))#defineSET_CONV_FUNC_GROUP(ofmt, ifmt) staticvoidset_generic_function(AudioConvert *ac){}voidff_audio_convert_free(AudioConvert **ac){if(!*ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);}AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enumAVSampleFormatout_fmt, enumAVSampleFormatin_fmt, intchannels, intsample_rate, intapply_map){AudioConvert *ac;intin_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) returnNULL;ac->avr=avr;ac->out_fmt=out_fmt;ac->in_fmt=in_fmt;ac->channels=channels;ac->apply_map=apply_map;if(avr->dither_method!=AV_RESAMPLE_DITHER_NONE &&av_get_packed_sample_fmt(out_fmt)==AV_SAMPLE_FMT_S16 &&av_get_bytes_per_sample(in_fmt)>2){ac->dc=ff_dither_alloc(avr, out_fmt, in_fmt, channels, sample_rate, apply_map);if(!ac->dc){av_free(ac);returnNULL;}returnac;}in_planar=ff_sample_fmt_is_planar(in_fmt, channels);out_planar=ff_sample_fmt_is_planar(out_fmt, channels);if(in_planar==out_planar){ac->func_type=CONV_FUNC_TYPE_FLAT;ac->planes=in_planar?ac->channels:1;}elseif(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;elseac->func_type=CONV_FUNC_TYPE_DEINTERLEAVE;set_generic_function(ac);if(ARCH_AARCH64) ff_audio_convert_init_aarch64(ac);if(ARCH_ARM) ff_audio_convert_init_arm(ac);if(ARCH_X86) ff_audio_convert_init_x86(ac);returnac;}intff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in){intuse_generic=1;intlen=in->nb_samples;intp;if(ac->dc){av_log(ac->avr, AV_LOG_TRACE,"%dsamples-audio_convert:%sto%s(dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));returnff_convert_dither(ac-> in
void * buf
Definition: avisynth_c.h:690
Definition: url.h:38
void ff_rtmpe_encrypt_sig(URLContext *h, uint8_t *sig, const uint8_t *digest, int type)
Encrypt the signature.
Definition: rtmpcrypt.c:207
GLint GLenum type
Definition: opengl_enc.c:105
#define AVIO_FLAG_READ_WRITE
read-write pseudo flag
Definition: avio.h:608
Describe the class of an AVClass context structure.
Definition: log.h:67
FF_DH * dh
Diffie-Hellman context.
Definition: rtmpcrypt.c:45
void * priv_data
Definition: url.h:41
int ff_rtmpe_update_keystream(URLContext *h)
Update the keystream and set RC4 keys for encryption.
Definition: rtmpcrypt.c:223
#define DEC
Definition: rtmpcrypt.c:314
static void rtmpe8_sig(const uint8_t *in, uint8_t *out, int key_id)
Definition: rtmpcrypt.c:184
const char * name
Definition: url.h:54
static const AVOption ffrtmpcrypt_options[]
Definition: rtmpcrypt.c:316
int ffurl_close(URLContext *h)
Definition: avio.c:467
#define RTMP_HANDSHAKE_PACKET_SIZE
Definition: rtmp.h:30
static int rtmpe_close(URLContext *h)
Definition: rtmpcrypt.c:238
av_cold FF_DH * ff_dh_init(int key_len)
Initialize a Diffie-Hellmann context.
Definition: rtmpdh.c:269
int av_rc4_init(AVRC4 *r, const uint8_t *key, int key_bits, int decrypt)
Initializes an AVRC4 context.
Definition: rc4.c:33
static const uint8_t rtmpe8_keys[16][16]
Definition: rtmpcrypt.c:52
struct AVRC4 key_in
RC4 key used for decrypt data.
Definition: rtmpcrypt.c:46
int ff_rtmp_calc_digest(const uint8_t *src, int len, int gap, const uint8_t *key, int keylen, uint8_t *dst)
Calculate HMAC-SHA2 digest for RTMP handshake packets.
Definition: rtmpproto.c:985
static int rtmpe_open(URLContext *h, const char *uri, int flags)
Definition: rtmpcrypt.c:248
static const AVClass ffrtmpcrypt_class
Definition: rtmpcrypt.c:321
struct AVRC4 key_out
RC4 key used for encrypt data.
Definition: rtmpcrypt.c:47
void av_xtea_le_crypt(AVXTEA *ctx, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt)
Encrypt or decrypt a buffer using a previously initialized context, in little endian format...
Definition: xtea.c:249
FILE * out
Definition: movenc.c:54
unbuffered private I/O API
Definition: xtea.h:35
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
int ffurl_read(URLContext *h, unsigned char *buf, int size)
Read up to size bytes from the resource accessed by h, and store the read bytes in buf...
Definition: avio.c:407
#define AV_WL32(p, v)
Definition: intreadwrite.h:426
static void rtmpe9_sig(const uint8_t *in, uint8_t *out, int key_id)
Definition: rtmpcrypt.c:192