(Partly) support Metasoft MJPEG Codec, fixes half of issue 1611.
[libav.git] / libavformat / rtmpproto.c
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1/*
2 * RTMP network protocol
3 * Copyright (c) 2009 Kostya Shishkov
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22/**
23 * @file libavformat/rtmpproto.c
24 * RTMP protocol
25 */
26
27#include "libavcodec/bytestream.h"
28#include "libavutil/avstring.h"
29#include "libavutil/lfg.h"
30#include "libavutil/sha.h"
31#include "avformat.h"
32
33#include "network.h"
34
35#include "flv.h"
36#include "rtmp.h"
37#include "rtmppkt.h"
38
39/* we can't use av_log() with URLContext yet... */
40#if LIBAVFORMAT_VERSION_MAJOR < 53
41#define LOG_CONTEXT NULL
42#else
43#define LOG_CONTEXT s
44#endif
45
46/** RTMP protocol handler state */
47typedef enum {
48 STATE_START, ///< client has not done anything yet
49 STATE_HANDSHAKED, ///< client has performed handshake
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50 STATE_RELEASING, ///< client releasing stream before publish it (for output)
51 STATE_FCPUBLISH, ///< client FCPublishing stream (for output)
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52 STATE_CONNECTING, ///< client connected to server successfully
53 STATE_READY, ///< client has sent all needed commands and waits for server reply
54 STATE_PLAYING, ///< client has started receiving multimedia data from server
6bf22e18 55 STATE_PUBLISHING, ///< client has started sending multimedia data to server (for output)
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56} ClientState;
57
58/** protocol handler context */
59typedef struct RTMPContext {
60 URLContext* stream; ///< TCP stream used in interactions with RTMP server
61 RTMPPacket prev_pkt[2][RTMP_CHANNELS]; ///< packet history used when reading and sending packets
62 int chunk_size; ///< size of the chunks RTMP packets are divided into
b316991b 63 int is_input; ///< input/output flag
9fd6b843 64 char playpath[256]; ///< path to filename to play (with possible "mp4:" prefix)
5e9ad759 65 char app[128]; ///< application
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66 ClientState state; ///< current state
67 int main_channel_id; ///< an additional channel ID which is used for some invocations
68 uint8_t* flv_data; ///< buffer with data for demuxer
69 int flv_size; ///< current buffer size
70 int flv_off; ///< number of bytes read from current buffer
6bf22e18 71 RTMPPacket out_pkt; ///< rtmp packet, created from flv a/v or metadata (for output)
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72} RTMPContext;
73
74#define PLAYER_KEY_OPEN_PART_LEN 30 ///< length of partial key used for first client digest signing
75/** Client key used for digest signing */
76static const uint8_t rtmp_player_key[] = {
77 'G', 'e', 'n', 'u', 'i', 'n', 'e', ' ', 'A', 'd', 'o', 'b', 'e', ' ',
78 'F', 'l', 'a', 's', 'h', ' ', 'P', 'l', 'a', 'y', 'e', 'r', ' ', '0', '0', '1',
79
80 0xF0, 0xEE, 0xC2, 0x4A, 0x80, 0x68, 0xBE, 0xE8, 0x2E, 0x00, 0xD0, 0xD1, 0x02,
81 0x9E, 0x7E, 0x57, 0x6E, 0xEC, 0x5D, 0x2D, 0x29, 0x80, 0x6F, 0xAB, 0x93, 0xB8,
82 0xE6, 0x36, 0xCF, 0xEB, 0x31, 0xAE
83};
84
85#define SERVER_KEY_OPEN_PART_LEN 36 ///< length of partial key used for first server digest signing
86/** Key used for RTMP server digest signing */
87static const uint8_t rtmp_server_key[] = {
88 'G', 'e', 'n', 'u', 'i', 'n', 'e', ' ', 'A', 'd', 'o', 'b', 'e', ' ',
89 'F', 'l', 'a', 's', 'h', ' ', 'M', 'e', 'd', 'i', 'a', ' ',
90 'S', 'e', 'r', 'v', 'e', 'r', ' ', '0', '0', '1',
91
92 0xF0, 0xEE, 0xC2, 0x4A, 0x80, 0x68, 0xBE, 0xE8, 0x2E, 0x00, 0xD0, 0xD1, 0x02,
93 0x9E, 0x7E, 0x57, 0x6E, 0xEC, 0x5D, 0x2D, 0x29, 0x80, 0x6F, 0xAB, 0x93, 0xB8,
94 0xE6, 0x36, 0xCF, 0xEB, 0x31, 0xAE
95};
96
97/**
98 * Generates 'connect' call and sends it to the server.
99 */
100static void gen_connect(URLContext *s, RTMPContext *rt, const char *proto,
5e9ad759 101 const char *host, int port)
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102{
103 RTMPPacket pkt;
6bf22e18 104 uint8_t ver[64], *p;
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105 char tcurl[512];
106
31da5966 107 ff_rtmp_packet_create(&pkt, RTMP_SYSTEM_CHANNEL, RTMP_PT_INVOKE, 0, 4096);
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108 p = pkt.data;
109
5e9ad759 110 snprintf(tcurl, sizeof(tcurl), "%s://%s:%d/%s", proto, host, port, rt->app);
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111 ff_amf_write_string(&p, "connect");
112 ff_amf_write_number(&p, 1.0);
113 ff_amf_write_object_start(&p);
114 ff_amf_write_field_name(&p, "app");
5e9ad759 115 ff_amf_write_string(&p, rt->app);
9fd6b843 116
6bf22e18 117 if (rt->is_input) {
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118 snprintf(ver, sizeof(ver), "%s %d,%d,%d,%d", RTMP_CLIENT_PLATFORM, RTMP_CLIENT_VER1,
119 RTMP_CLIENT_VER2, RTMP_CLIENT_VER3, RTMP_CLIENT_VER4);
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120 } else {
121 snprintf(ver, sizeof(ver), "FMLE/3.0 (compatible; %s)", LIBAVFORMAT_IDENT);
122 ff_amf_write_field_name(&p, "type");
123 ff_amf_write_string(&p, "nonprivate");
124 }
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125 ff_amf_write_field_name(&p, "flashVer");
126 ff_amf_write_string(&p, ver);
127 ff_amf_write_field_name(&p, "tcUrl");
128 ff_amf_write_string(&p, tcurl);
6bf22e18 129 if (rt->is_input) {
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130 ff_amf_write_field_name(&p, "fpad");
131 ff_amf_write_bool(&p, 0);
132 ff_amf_write_field_name(&p, "capabilities");
133 ff_amf_write_number(&p, 15.0);
134 ff_amf_write_field_name(&p, "audioCodecs");
135 ff_amf_write_number(&p, 1639.0);
136 ff_amf_write_field_name(&p, "videoCodecs");
137 ff_amf_write_number(&p, 252.0);
138 ff_amf_write_field_name(&p, "videoFunction");
139 ff_amf_write_number(&p, 1.0);
6bf22e18 140 }
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141 ff_amf_write_object_end(&p);
142
143 pkt.data_size = p - pkt.data;
144
145 ff_rtmp_packet_write(rt->stream, &pkt, rt->chunk_size, rt->prev_pkt[1]);
146}
147
148/**
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149 * Generates 'releaseStream' call and sends it to the server. It should make
150 * the server release some channel for media streams.
151 */
152static void gen_release_stream(URLContext *s, RTMPContext *rt)
153{
154 RTMPPacket pkt;
155 uint8_t *p;
156
157 ff_rtmp_packet_create(&pkt, RTMP_SYSTEM_CHANNEL, RTMP_PT_INVOKE, 0,
158 29 + strlen(rt->playpath));
159
160 av_log(LOG_CONTEXT, AV_LOG_DEBUG, "Releasing stream...\n");
161 p = pkt.data;
162 ff_amf_write_string(&p, "releaseStream");
163 ff_amf_write_number(&p, 2.0);
164 ff_amf_write_null(&p);
165 ff_amf_write_string(&p, rt->playpath);
166
167 ff_rtmp_packet_write(rt->stream, &pkt, rt->chunk_size, rt->prev_pkt[1]);
168 ff_rtmp_packet_destroy(&pkt);
169}
170
171/**
172 * Generates 'FCPublish' call and sends it to the server. It should make
173 * the server preapare for receiving media streams.
174 */
175static void gen_fcpublish_stream(URLContext *s, RTMPContext *rt)
176{
177 RTMPPacket pkt;
178 uint8_t *p;
179
180 ff_rtmp_packet_create(&pkt, RTMP_SYSTEM_CHANNEL, RTMP_PT_INVOKE, 0,
181 25 + strlen(rt->playpath));
182
183 av_log(LOG_CONTEXT, AV_LOG_DEBUG, "FCPublish stream...\n");
184 p = pkt.data;
185 ff_amf_write_string(&p, "FCPublish");
186 ff_amf_write_number(&p, 3.0);
187 ff_amf_write_null(&p);
188 ff_amf_write_string(&p, rt->playpath);
189
190 ff_rtmp_packet_write(rt->stream, &pkt, rt->chunk_size, rt->prev_pkt[1]);
191 ff_rtmp_packet_destroy(&pkt);
192}
193
194/**
195 * Generates 'FCUnpublish' call and sends it to the server. It should make
196 * the server destroy stream.
197 */
198static void gen_fcunpublish_stream(URLContext *s, RTMPContext *rt)
199{
200 RTMPPacket pkt;
201 uint8_t *p;
202
203 ff_rtmp_packet_create(&pkt, RTMP_SYSTEM_CHANNEL, RTMP_PT_INVOKE, 0,
204 27 + strlen(rt->playpath));
205
206 av_log(LOG_CONTEXT, AV_LOG_DEBUG, "UnPublishing stream...\n");
207 p = pkt.data;
208 ff_amf_write_string(&p, "FCUnpublish");
209 ff_amf_write_number(&p, 5.0);
210 ff_amf_write_null(&p);
211 ff_amf_write_string(&p, rt->playpath);
212
213 ff_rtmp_packet_write(rt->stream, &pkt, rt->chunk_size, rt->prev_pkt[1]);
214 ff_rtmp_packet_destroy(&pkt);
215}
216
217/**
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218 * Generates 'createStream' call and sends it to the server. It should make
219 * the server allocate some channel for media streams.
220 */
221static void gen_create_stream(URLContext *s, RTMPContext *rt)
222{
223 RTMPPacket pkt;
224 uint8_t *p;
225
226 av_log(LOG_CONTEXT, AV_LOG_DEBUG, "Creating stream...\n");
31da5966 227 ff_rtmp_packet_create(&pkt, RTMP_SYSTEM_CHANNEL, RTMP_PT_INVOKE, 0, 25);
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228
229 p = pkt.data;
230 ff_amf_write_string(&p, "createStream");
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231 ff_amf_write_number(&p, rt->is_input ? 3.0 : 4.0);
232 ff_amf_write_null(&p);
233
234 ff_rtmp_packet_write(rt->stream, &pkt, rt->chunk_size, rt->prev_pkt[1]);
235 ff_rtmp_packet_destroy(&pkt);
236}
237
238
239/**
240 * Generates 'deleteStream' call and sends it to the server. It should make
241 * the server remove some channel for media streams.
242 */
243static void gen_delete_stream(URLContext *s, RTMPContext *rt)
244{
245 RTMPPacket pkt;
246 uint8_t *p;
247
248 av_log(LOG_CONTEXT, AV_LOG_DEBUG, "Deleting stream...\n");
249 ff_rtmp_packet_create(&pkt, RTMP_SYSTEM_CHANNEL, RTMP_PT_INVOKE, 0, 34);
250
251 p = pkt.data;
252 ff_amf_write_string(&p, "deleteStream");
253 ff_amf_write_number(&p, 0.0);
9fd6b843 254 ff_amf_write_null(&p);
6bf22e18 255 ff_amf_write_number(&p, rt->main_channel_id);
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256
257 ff_rtmp_packet_write(rt->stream, &pkt, rt->chunk_size, rt->prev_pkt[1]);
258 ff_rtmp_packet_destroy(&pkt);
259}
260
261/**
262 * Generates 'play' call and sends it to the server, then pings the server
263 * to start actual playing.
264 */
265static void gen_play(URLContext *s, RTMPContext *rt)
266{
267 RTMPPacket pkt;
268 uint8_t *p;
269
270 av_log(LOG_CONTEXT, AV_LOG_DEBUG, "Sending play command for '%s'\n", rt->playpath);
271 ff_rtmp_packet_create(&pkt, RTMP_VIDEO_CHANNEL, RTMP_PT_INVOKE, 0,
f836fa17 272 20 + strlen(rt->playpath));
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273 pkt.extra = rt->main_channel_id;
274
275 p = pkt.data;
276 ff_amf_write_string(&p, "play");
277 ff_amf_write_number(&p, 0.0);
278 ff_amf_write_null(&p);
279 ff_amf_write_string(&p, rt->playpath);
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280
281 ff_rtmp_packet_write(rt->stream, &pkt, rt->chunk_size, rt->prev_pkt[1]);
282 ff_rtmp_packet_destroy(&pkt);
283
284 // set client buffer time disguised in ping packet
285 ff_rtmp_packet_create(&pkt, RTMP_NETWORK_CHANNEL, RTMP_PT_PING, 1, 10);
286
287 p = pkt.data;
288 bytestream_put_be16(&p, 3);
289 bytestream_put_be32(&p, 1);
290 bytestream_put_be32(&p, 256); //TODO: what is a good value here?
291
292 ff_rtmp_packet_write(rt->stream, &pkt, rt->chunk_size, rt->prev_pkt[1]);
293 ff_rtmp_packet_destroy(&pkt);
294}
295
296/**
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297 * Generates 'publish' call and sends it to the server.
298 */
299static void gen_publish(URLContext *s, RTMPContext *rt)
300{
301 RTMPPacket pkt;
302 uint8_t *p;
303
304 av_log(LOG_CONTEXT, AV_LOG_DEBUG, "Sending publish command for '%s'\n", rt->playpath);
305 ff_rtmp_packet_create(&pkt, RTMP_SOURCE_CHANNEL, RTMP_PT_INVOKE, 0,
306 30 + strlen(rt->playpath));
307 pkt.extra = rt->main_channel_id;
308
309 p = pkt.data;
310 ff_amf_write_string(&p, "publish");
311 ff_amf_write_number(&p, 0.0);
312 ff_amf_write_null(&p);
313 ff_amf_write_string(&p, rt->playpath);
314 ff_amf_write_string(&p, "live");
315
316 ff_rtmp_packet_write(rt->stream, &pkt, rt->chunk_size, rt->prev_pkt[1]);
317 ff_rtmp_packet_destroy(&pkt);
318}
319
320/**
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321 * Generates ping reply and sends it to the server.
322 */
323static void gen_pong(URLContext *s, RTMPContext *rt, RTMPPacket *ppkt)
324{
325 RTMPPacket pkt;
326 uint8_t *p;
327
328 ff_rtmp_packet_create(&pkt, RTMP_NETWORK_CHANNEL, RTMP_PT_PING, ppkt->timestamp + 1, 6);
329 p = pkt.data;
330 bytestream_put_be16(&p, 7);
331 bytestream_put_be32(&p, AV_RB32(ppkt->data+2) + 1);
332 ff_rtmp_packet_write(rt->stream, &pkt, rt->chunk_size, rt->prev_pkt[1]);
333 ff_rtmp_packet_destroy(&pkt);
334}
335
336//TODO: Move HMAC code somewhere. Eventually.
337#define HMAC_IPAD_VAL 0x36
338#define HMAC_OPAD_VAL 0x5C
339
340/**
341 * Calculates HMAC-SHA2 digest for RTMP handshake packets.
342 *
343 * @param src input buffer
344 * @param len input buffer length (should be 1536)
345 * @param gap offset in buffer where 32 bytes should not be taken into account
346 * when calculating digest (since it will be used to store that digest)
347 * @param key digest key
348 * @param keylen digest key length
349 * @param dst buffer where calculated digest will be stored (32 bytes)
350 */
351static void rtmp_calc_digest(const uint8_t *src, int len, int gap,
352 const uint8_t *key, int keylen, uint8_t *dst)
353{
354 struct AVSHA *sha;
355 uint8_t hmac_buf[64+32] = {0};
356 int i;
357
358 sha = av_mallocz(av_sha_size);
359
360 if (keylen < 64) {
361 memcpy(hmac_buf, key, keylen);
362 } else {
363 av_sha_init(sha, 256);
364 av_sha_update(sha,key, keylen);
365 av_sha_final(sha, hmac_buf);
366 }
367 for (i = 0; i < 64; i++)
368 hmac_buf[i] ^= HMAC_IPAD_VAL;
369
370 av_sha_init(sha, 256);
371 av_sha_update(sha, hmac_buf, 64);
372 if (gap <= 0) {
373 av_sha_update(sha, src, len);
374 } else { //skip 32 bytes used for storing digest
375 av_sha_update(sha, src, gap);
376 av_sha_update(sha, src + gap + 32, len - gap - 32);
377 }
378 av_sha_final(sha, hmac_buf + 64);
379
380 for (i = 0; i < 64; i++)
381 hmac_buf[i] ^= HMAC_IPAD_VAL ^ HMAC_OPAD_VAL; //reuse XORed key for opad
382 av_sha_init(sha, 256);
383 av_sha_update(sha, hmac_buf, 64+32);
384 av_sha_final(sha, dst);
385
386 av_free(sha);
387}
388
389/**
390 * Puts HMAC-SHA2 digest of packet data (except for the bytes where this digest
391 * will be stored) into that packet.
392 *
393 * @param buf handshake data (1536 bytes)
394 * @return offset to the digest inside input data
395 */
396static int rtmp_handshake_imprint_with_digest(uint8_t *buf)
397{
398 int i, digest_pos = 0;
399
400 for (i = 8; i < 12; i++)
401 digest_pos += buf[i];
402 digest_pos = (digest_pos % 728) + 12;
403
404 rtmp_calc_digest(buf, RTMP_HANDSHAKE_PACKET_SIZE, digest_pos,
405 rtmp_player_key, PLAYER_KEY_OPEN_PART_LEN,
406 buf + digest_pos);
407 return digest_pos;
408}
409
410/**
411 * Verifies that the received server response has the expected digest value.
412 *
413 * @param buf handshake data received from the server (1536 bytes)
414 * @param off position to search digest offset from
415 * @return 0 if digest is valid, digest position otherwise
416 */
417static int rtmp_validate_digest(uint8_t *buf, int off)
418{
419 int i, digest_pos = 0;
420 uint8_t digest[32];
421
422 for (i = 0; i < 4; i++)
423 digest_pos += buf[i + off];
424 digest_pos = (digest_pos % 728) + off + 4;
425
426 rtmp_calc_digest(buf, RTMP_HANDSHAKE_PACKET_SIZE, digest_pos,
427 rtmp_server_key, SERVER_KEY_OPEN_PART_LEN,
428 digest);
429 if (!memcmp(digest, buf + digest_pos, 32))
430 return digest_pos;
431 return 0;
432}
433
434/**
435 * Performs handshake with the server by means of exchanging pseudorandom data
436 * signed with HMAC-SHA2 digest.
437 *
438 * @return 0 if handshake succeeds, negative value otherwise
439 */
440static int rtmp_handshake(URLContext *s, RTMPContext *rt)
441{
442 AVLFG rnd;
443 uint8_t tosend [RTMP_HANDSHAKE_PACKET_SIZE+1] = {
444 3, // unencrypted data
445 0, 0, 0, 0, // client uptime
446 RTMP_CLIENT_VER1,
447 RTMP_CLIENT_VER2,
448 RTMP_CLIENT_VER3,
449 RTMP_CLIENT_VER4,
450 };
451 uint8_t clientdata[RTMP_HANDSHAKE_PACKET_SIZE];
452 uint8_t serverdata[RTMP_HANDSHAKE_PACKET_SIZE+1];
453 int i;
454 int server_pos, client_pos;
455 uint8_t digest[32];
456
457 av_log(LOG_CONTEXT, AV_LOG_DEBUG, "Handshaking...\n");
458
459 av_lfg_init(&rnd, 0xDEADC0DE);
460 // generate handshake packet - 1536 bytes of pseudorandom data
461 for (i = 9; i <= RTMP_HANDSHAKE_PACKET_SIZE; i++)
462 tosend[i] = av_lfg_get(&rnd) >> 24;
463 client_pos = rtmp_handshake_imprint_with_digest(tosend + 1);
464
465 url_write(rt->stream, tosend, RTMP_HANDSHAKE_PACKET_SIZE + 1);
466 i = url_read_complete(rt->stream, serverdata, RTMP_HANDSHAKE_PACKET_SIZE + 1);
467 if (i != RTMP_HANDSHAKE_PACKET_SIZE + 1) {
468 av_log(LOG_CONTEXT, AV_LOG_ERROR, "Cannot read RTMP handshake response\n");
469 return -1;
470 }
471 i = url_read_complete(rt->stream, clientdata, RTMP_HANDSHAKE_PACKET_SIZE);
472 if (i != RTMP_HANDSHAKE_PACKET_SIZE) {
473 av_log(LOG_CONTEXT, AV_LOG_ERROR, "Cannot read RTMP handshake response\n");
474 return -1;
475 }
476
477 av_log(LOG_CONTEXT, AV_LOG_DEBUG, "Server version %d.%d.%d.%d\n",
478 serverdata[5], serverdata[6], serverdata[7], serverdata[8]);
479
6bf22e18 480 if (rt->is_input) {
c7240611 481 server_pos = rtmp_validate_digest(serverdata + 1, 772);
9fd6b843 482 if (!server_pos) {
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483 server_pos = rtmp_validate_digest(serverdata + 1, 8);
484 if (!server_pos) {
485 av_log(LOG_CONTEXT, AV_LOG_ERROR, "Server response validating failed\n");
486 return -1;
487 }
9fd6b843 488 }
9fd6b843 489
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490 rtmp_calc_digest(tosend + 1 + client_pos, 32, 0,
491 rtmp_server_key, sizeof(rtmp_server_key),
492 digest);
493 rtmp_calc_digest(clientdata, RTMP_HANDSHAKE_PACKET_SIZE-32, 0,
494 digest, 32,
495 digest);
496 if (memcmp(digest, clientdata + RTMP_HANDSHAKE_PACKET_SIZE - 32, 32)) {
497 av_log(LOG_CONTEXT, AV_LOG_ERROR, "Signature mismatch\n");
498 return -1;
499 }
9fd6b843 500
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501 for (i = 0; i < RTMP_HANDSHAKE_PACKET_SIZE; i++)
502 tosend[i] = av_lfg_get(&rnd) >> 24;
503 rtmp_calc_digest(serverdata + 1 + server_pos, 32, 0,
504 rtmp_player_key, sizeof(rtmp_player_key),
505 digest);
506 rtmp_calc_digest(tosend, RTMP_HANDSHAKE_PACKET_SIZE - 32, 0,
507 digest, 32,
508 tosend + RTMP_HANDSHAKE_PACKET_SIZE - 32);
509
510 // write reply back to the server
511 url_write(rt->stream, tosend, RTMP_HANDSHAKE_PACKET_SIZE);
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512 } else {
513 url_write(rt->stream, serverdata+1, RTMP_HANDSHAKE_PACKET_SIZE);
514 }
515
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516 return 0;
517}
518
519/**
520 * Parses received packet and may perform some action depending on
521 * the packet contents.
522 * @return 0 for no errors, negative values for serious errors which prevent
523 * further communications, positive values for uncritical errors
524 */
525static int rtmp_parse_result(URLContext *s, RTMPContext *rt, RTMPPacket *pkt)
526{
527 int i, t;
528 const uint8_t *data_end = pkt->data + pkt->data_size;
529
530 switch (pkt->type) {
531 case RTMP_PT_CHUNK_SIZE:
532 if (pkt->data_size != 4) {
533 av_log(LOG_CONTEXT, AV_LOG_ERROR,
534 "Chunk size change packet is not 4 bytes long (%d)\n", pkt->data_size);
535 return -1;
536 }
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537 if (!rt->is_input)
538 ff_rtmp_packet_write(rt->stream, pkt, rt->chunk_size, rt->prev_pkt[1]);
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539 rt->chunk_size = AV_RB32(pkt->data);
540 if (rt->chunk_size <= 0) {
541 av_log(LOG_CONTEXT, AV_LOG_ERROR, "Incorrect chunk size %d\n", rt->chunk_size);
542 return -1;
543 }
544 av_log(LOG_CONTEXT, AV_LOG_DEBUG, "New chunk size = %d\n", rt->chunk_size);
545 break;
546 case RTMP_PT_PING:
547 t = AV_RB16(pkt->data);
548 if (t == 6)
549 gen_pong(s, rt, pkt);
550 break;
551 case RTMP_PT_INVOKE:
552 //TODO: check for the messages sent for wrong state?
553 if (!memcmp(pkt->data, "\002\000\006_error", 9)) {
554 uint8_t tmpstr[256];
555
556 if (!ff_amf_get_field_value(pkt->data + 9, data_end,
557 "description", tmpstr, sizeof(tmpstr)))
558 av_log(LOG_CONTEXT, AV_LOG_ERROR, "Server error: %s\n",tmpstr);
559 return -1;
560 } else if (!memcmp(pkt->data, "\002\000\007_result", 10)) {
561 switch (rt->state) {
562 case STATE_HANDSHAKED:
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563 if (!rt->is_input) {
564 gen_release_stream(s, rt);
565 gen_fcpublish_stream(s, rt);
566 rt->state = STATE_RELEASING;
567 } else {
568 rt->state = STATE_CONNECTING;
569 }
9fd6b843 570 gen_create_stream(s, rt);
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571 break;
572 case STATE_FCPUBLISH:
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573 rt->state = STATE_CONNECTING;
574 break;
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575 case STATE_RELEASING:
576 rt->state = STATE_FCPUBLISH;
577 /* hack for Wowza Media Server, it does not send result for
578 * releaseStream and FCPublish calls */
579 if (!pkt->data[10]) {
580 int pkt_id = (int) av_int2dbl(AV_RB64(pkt->data + 11));
581 if (pkt_id == 4)
582 rt->state = STATE_CONNECTING;
583 }
e07c92e4 584 if (rt->state != STATE_CONNECTING)
6bf22e18 585 break;
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586 case STATE_CONNECTING:
587 //extract a number from the result
588 if (pkt->data[10] || pkt->data[19] != 5 || pkt->data[20]) {
589 av_log(LOG_CONTEXT, AV_LOG_WARNING, "Unexpected reply on connect()\n");
590 } else {
591 rt->main_channel_id = (int) av_int2dbl(AV_RB64(pkt->data + 21));
592 }
6bf22e18 593 if (rt->is_input) {
c7240611 594 gen_play(s, rt);
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595 } else {
596 gen_publish(s, rt);
597 }
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598 rt->state = STATE_READY;
599 break;
600 }
601 } else if (!memcmp(pkt->data, "\002\000\010onStatus", 11)) {
602 const uint8_t* ptr = pkt->data + 11;
603 uint8_t tmpstr[256];
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604
605 for (i = 0; i < 2; i++) {
606 t = ff_amf_tag_size(ptr, data_end);
607 if (t < 0)
608 return 1;
609 ptr += t;
610 }
611 t = ff_amf_get_field_value(ptr, data_end,
612 "level", tmpstr, sizeof(tmpstr));
613 if (!t && !strcmp(tmpstr, "error")) {
614 if (!ff_amf_get_field_value(ptr, data_end,
615 "description", tmpstr, sizeof(tmpstr)))
616 av_log(LOG_CONTEXT, AV_LOG_ERROR, "Server error: %s\n",tmpstr);
617 return -1;
618 }
619 t = ff_amf_get_field_value(ptr, data_end,
620 "code", tmpstr, sizeof(tmpstr));
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621 if (!t && !strcmp(tmpstr, "NetStream.Play.Start")) rt->state = STATE_PLAYING;
622 if (!t && !strcmp(tmpstr, "NetStream.Publish.Start")) rt->state = STATE_PUBLISHING;
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623 }
624 break;
625 }
626 return 0;
627}
628
629/**
630 * Interacts with the server by receiving and sending RTMP packets until
631 * there is some significant data (media data or expected status notification).
632 *
633 * @param s reading context
1d8041b3
SS
634 * @param for_header non-zero value tells function to work until it
635 * gets notification from the server that playing has been started,
636 * otherwise function will work until some media data is received (or
637 * an error happens)
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638 * @return 0 for successful operation, negative value in case of error
639 */
640static int get_packet(URLContext *s, int for_header)
641{
642 RTMPContext *rt = s->priv_data;
643 int ret;
644
e07c92e4 645 for (;;) {
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646 RTMPPacket rpkt;
647 if ((ret = ff_rtmp_packet_read(rt->stream, &rpkt,
648 rt->chunk_size, rt->prev_pkt[0])) != 0) {
649 if (ret > 0) {
650 return AVERROR(EAGAIN);
651 } else {
652 return AVERROR(EIO);
653 }
654 }
655
656 ret = rtmp_parse_result(s, rt, &rpkt);
657 if (ret < 0) {//serious error in current packet
658 ff_rtmp_packet_destroy(&rpkt);
659 return -1;
660 }
6bf22e18 661 if (for_header && (rt->state == STATE_PLAYING || rt->state == STATE_PUBLISHING)) {
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662 ff_rtmp_packet_destroy(&rpkt);
663 return 0;
664 }
6bf22e18 665 if (!rpkt.data_size || !rt->is_input) {
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666 ff_rtmp_packet_destroy(&rpkt);
667 continue;
668 }
669 if (rpkt.type == RTMP_PT_VIDEO || rpkt.type == RTMP_PT_AUDIO ||
afbacb93 670 (rpkt.type == RTMP_PT_NOTIFY && !memcmp("\002\000\012onMetaData", rpkt.data, 13))) {
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671 uint8_t *p;
672 uint32_t ts = rpkt.timestamp;
673
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674 // generate packet header and put data into buffer for FLV demuxer
675 rt->flv_off = 0;
676 rt->flv_size = rpkt.data_size + 15;
677 rt->flv_data = p = av_realloc(rt->flv_data, rt->flv_size);
678 bytestream_put_byte(&p, rpkt.type);
679 bytestream_put_be24(&p, rpkt.data_size);
680 bytestream_put_be24(&p, ts);
681 bytestream_put_byte(&p, ts >> 24);
682 bytestream_put_be24(&p, 0);
683 bytestream_put_buffer(&p, rpkt.data, rpkt.data_size);
684 bytestream_put_be32(&p, 0);
685 ff_rtmp_packet_destroy(&rpkt);
686 return 0;
687 } else if (rpkt.type == RTMP_PT_METADATA) {
688 // we got raw FLV data, make it available for FLV demuxer
689 rt->flv_off = 0;
690 rt->flv_size = rpkt.data_size;
691 rt->flv_data = av_realloc(rt->flv_data, rt->flv_size);
692 memcpy(rt->flv_data, rpkt.data, rpkt.data_size);
693 ff_rtmp_packet_destroy(&rpkt);
694 return 0;
695 }
696 ff_rtmp_packet_destroy(&rpkt);
697 }
698 return 0;
699}
700
701static int rtmp_close(URLContext *h)
702{
703 RTMPContext *rt = h->priv_data;
704
e07c92e4 705 if (!rt->is_input) {
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706 rt->flv_data = NULL;
707 if (rt->out_pkt.data_size)
708 ff_rtmp_packet_destroy(&rt->out_pkt);
615c2879
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709 if (rt->state > STATE_FCPUBLISH)
710 gen_fcunpublish_stream(h, rt);
6bf22e18 711 }
615c2879
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712 if (rt->state > STATE_HANDSHAKED)
713 gen_delete_stream(h, rt);
6bf22e18 714
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715 av_freep(&rt->flv_data);
716 url_close(rt->stream);
717 av_free(rt);
718 return 0;
719}
720
721/**
722 * Opens RTMP connection and verifies that the stream can be played.
723 *
724 * URL syntax: rtmp://server[:port][/app][/playpath]
725 * where 'app' is first one or two directories in the path
726 * (e.g. /ondemand/, /flash/live/, etc.)
727 * and 'playpath' is a file name (the rest of the path,
728 * may be prefixed with "mp4:")
729 */
730static int rtmp_open(URLContext *s, const char *uri, int flags)
731{
732 RTMPContext *rt;
5e9ad759 733 char proto[8], hostname[256], path[1024], *fname;
9fd6b843 734 uint8_t buf[2048];
b316991b 735 int port;
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736 int ret;
737
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738 rt = av_mallocz(sizeof(RTMPContext));
739 if (!rt)
740 return AVERROR(ENOMEM);
741 s->priv_data = rt;
b316991b 742 rt->is_input = !(flags & URL_WRONLY);
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743
744 url_split(proto, sizeof(proto), NULL, 0, hostname, sizeof(hostname), &port,
745 path, sizeof(path), s->filename);
746
747 if (port < 0)
748 port = RTMP_DEFAULT_PORT;
749 snprintf(buf, sizeof(buf), "tcp://%s:%d", hostname, port);
750
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751 if (url_open(&rt->stream, buf, URL_RDWR) < 0) {
752 av_log(LOG_CONTEXT, AV_LOG_ERROR, "Cannot open connection %s\n", buf);
9fd6b843 753 goto fail;
fe523958 754 }
9fd6b843 755
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756 rt->state = STATE_START;
757 if (rtmp_handshake(s, rt))
758 return -1;
9fd6b843 759
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760 rt->chunk_size = 128;
761 rt->state = STATE_HANDSHAKED;
762 //extract "app" part from path
763 if (!strncmp(path, "/ondemand/", 10)) {
764 fname = path + 10;
765 memcpy(rt->app, "ondemand", 9);
766 } else {
767 char *p = strchr(path + 1, '/');
768 if (!p) {
769 fname = path + 1;
770 rt->app[0] = '\0';
9fd6b843 771 } else {
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772 char *c = strchr(p + 1, ':');
773 fname = strchr(p + 1, '/');
774 if (!fname || c < fname) {
775 fname = p + 1;
776 av_strlcpy(rt->app, path + 1, p - path);
9fd6b843 777 } else {
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778 fname++;
779 av_strlcpy(rt->app, path + 1, fname - path - 1);
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780 }
781 }
c7240611
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782 }
783 if (!strchr(fname, ':') &&
784 (!strcmp(fname + strlen(fname) - 4, ".f4v") ||
785 !strcmp(fname + strlen(fname) - 4, ".mp4"))) {
786 memcpy(rt->playpath, "mp4:", 5);
787 } else {
788 rt->playpath[0] = 0;
789 }
790 strncat(rt->playpath, fname, sizeof(rt->playpath) - 5);
9fd6b843 791
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792 av_log(LOG_CONTEXT, AV_LOG_DEBUG, "Proto = %s, path = %s, app = %s, fname = %s\n",
793 proto, path, rt->app, rt->playpath);
794 gen_connect(s, rt, proto, hostname, port);
9fd6b843 795
c7240611
KS
796 do {
797 ret = get_packet(s, 1);
798 } while (ret == EAGAIN);
799 if (ret < 0)
800 goto fail;
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S
801
802 if (rt->is_input) {
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803 // generate FLV header for demuxer
804 rt->flv_size = 13;
805 rt->flv_data = av_realloc(rt->flv_data, rt->flv_size);
806 rt->flv_off = 0;
807 memcpy(rt->flv_data, "FLV\1\5\0\0\0\011\0\0\0\0", rt->flv_size);
6bf22e18
S
808 } else {
809 rt->flv_size = 0;
810 rt->flv_data = NULL;
811 rt->flv_off = 0;
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812 }
813
814 s->max_packet_size = url_get_max_packet_size(rt->stream);
815 s->is_streamed = 1;
816 return 0;
817
818fail:
819 rtmp_close(s);
820 return AVERROR(EIO);
821}
822
823static int rtmp_read(URLContext *s, uint8_t *buf, int size)
824{
825 RTMPContext *rt = s->priv_data;
826 int orig_size = size;
827 int ret;
828
829 while (size > 0) {
830 int data_left = rt->flv_size - rt->flv_off;
831
832 if (data_left >= size) {
833 memcpy(buf, rt->flv_data + rt->flv_off, size);
834 rt->flv_off += size;
835 return orig_size;
836 }
837 if (data_left > 0) {
838 memcpy(buf, rt->flv_data + rt->flv_off, data_left);
839 buf += data_left;
840 size -= data_left;
841 rt->flv_off = rt->flv_size;
842 }
843 if ((ret = get_packet(s, 0)) < 0)
844 return ret;
845 }
846 return orig_size;
847}
848
849static int rtmp_write(URLContext *h, uint8_t *buf, int size)
850{
6bf22e18
S
851 RTMPContext *rt = h->priv_data;
852 int size_temp = size;
853 int pktsize, pkttype;
854 uint32_t ts;
855 const uint8_t *buf_temp = buf;
856
857 if (size < 11) {
858 av_log(LOG_CONTEXT, AV_LOG_DEBUG, "FLV packet too small %d\n", size);
859 return 0;
860 }
861
862 do {
863 if (!rt->flv_off) {
864 //skip flv header
865 if (buf_temp[0] == 'F' && buf_temp[1] == 'L' && buf_temp[2] == 'V') {
866 buf_temp += 9 + 4;
867 size_temp -= 9 + 4;
868 }
869
870 pkttype = bytestream_get_byte(&buf_temp);
871 pktsize = bytestream_get_be24(&buf_temp);
872 ts = bytestream_get_be24(&buf_temp);
873 ts |= bytestream_get_byte(&buf_temp) << 24;
874 bytestream_get_be24(&buf_temp);
875 size_temp -= 11;
876 rt->flv_size = pktsize;
877
878 //force 12bytes header
879 if (((pkttype == RTMP_PT_VIDEO || pkttype == RTMP_PT_AUDIO) && ts == 0) ||
880 pkttype == RTMP_PT_NOTIFY) {
881 if (pkttype == RTMP_PT_NOTIFY)
882 pktsize += 16;
883 rt->prev_pkt[1][RTMP_SOURCE_CHANNEL].channel_id = 0;
884 }
885
886 //this can be a big packet, it's better to send it right here
887 ff_rtmp_packet_create(&rt->out_pkt, RTMP_SOURCE_CHANNEL, pkttype, ts, pktsize);
888 rt->out_pkt.extra = rt->main_channel_id;
889 rt->flv_data = rt->out_pkt.data;
890
891 if (pkttype == RTMP_PT_NOTIFY)
892 ff_amf_write_string(&rt->flv_data, "@setDataFrame");
893 }
894
895 if (rt->flv_size - rt->flv_off > size_temp) {
896 bytestream_get_buffer(&buf_temp, rt->flv_data + rt->flv_off, size_temp);
897 rt->flv_off += size_temp;
898 } else {
899 bytestream_get_buffer(&buf_temp, rt->flv_data + rt->flv_off, rt->flv_size - rt->flv_off);
900 rt->flv_off += rt->flv_size - rt->flv_off;
901 }
902
903 if (rt->flv_off == rt->flv_size) {
904 bytestream_get_be32(&buf_temp);
905
906 ff_rtmp_packet_write(rt->stream, &rt->out_pkt, rt->chunk_size, rt->prev_pkt[1]);
907 ff_rtmp_packet_destroy(&rt->out_pkt);
908 rt->flv_size = 0;
909 rt->flv_off = 0;
910 }
911 } while (buf_temp - buf < size_temp);
912 return size;
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913}
914
915URLProtocol rtmp_protocol = {
916 "rtmp",
917 rtmp_open,
918 rtmp_read,
919 rtmp_write,
920 NULL, /* seek */
921 rtmp_close,
922};