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9fd6b843 KS |
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 */ | |
47 | typedef enum { | |
48 | STATE_START, ///< client has not done anything yet | |
49 | STATE_HANDSHAKED, ///< client has performed handshake | |
50 | STATE_CONNECTING, ///< client connected to server successfully | |
51 | STATE_READY, ///< client has sent all needed commands and waits for server reply | |
52 | STATE_PLAYING, ///< client has started receiving multimedia data from server | |
53 | } ClientState; | |
54 | ||
55 | /** protocol handler context */ | |
56 | typedef struct RTMPContext { | |
57 | URLContext* stream; ///< TCP stream used in interactions with RTMP server | |
58 | RTMPPacket prev_pkt[2][RTMP_CHANNELS]; ///< packet history used when reading and sending packets | |
59 | int chunk_size; ///< size of the chunks RTMP packets are divided into | |
b316991b | 60 | int is_input; ///< input/output flag |
9fd6b843 | 61 | char playpath[256]; ///< path to filename to play (with possible "mp4:" prefix) |
5e9ad759 | 62 | char app[128]; ///< application |
9fd6b843 KS |
63 | ClientState state; ///< current state |
64 | int main_channel_id; ///< an additional channel ID which is used for some invocations | |
65 | uint8_t* flv_data; ///< buffer with data for demuxer | |
66 | int flv_size; ///< current buffer size | |
67 | int flv_off; ///< number of bytes read from current buffer | |
9fd6b843 KS |
68 | } RTMPContext; |
69 | ||
70 | #define PLAYER_KEY_OPEN_PART_LEN 30 ///< length of partial key used for first client digest signing | |
71 | /** Client key used for digest signing */ | |
72 | static const uint8_t rtmp_player_key[] = { | |
73 | 'G', 'e', 'n', 'u', 'i', 'n', 'e', ' ', 'A', 'd', 'o', 'b', 'e', ' ', | |
74 | 'F', 'l', 'a', 's', 'h', ' ', 'P', 'l', 'a', 'y', 'e', 'r', ' ', '0', '0', '1', | |
75 | ||
76 | 0xF0, 0xEE, 0xC2, 0x4A, 0x80, 0x68, 0xBE, 0xE8, 0x2E, 0x00, 0xD0, 0xD1, 0x02, | |
77 | 0x9E, 0x7E, 0x57, 0x6E, 0xEC, 0x5D, 0x2D, 0x29, 0x80, 0x6F, 0xAB, 0x93, 0xB8, | |
78 | 0xE6, 0x36, 0xCF, 0xEB, 0x31, 0xAE | |
79 | }; | |
80 | ||
81 | #define SERVER_KEY_OPEN_PART_LEN 36 ///< length of partial key used for first server digest signing | |
82 | /** Key used for RTMP server digest signing */ | |
83 | static const uint8_t rtmp_server_key[] = { | |
84 | 'G', 'e', 'n', 'u', 'i', 'n', 'e', ' ', 'A', 'd', 'o', 'b', 'e', ' ', | |
85 | 'F', 'l', 'a', 's', 'h', ' ', 'M', 'e', 'd', 'i', 'a', ' ', | |
86 | 'S', 'e', 'r', 'v', 'e', 'r', ' ', '0', '0', '1', | |
87 | ||
88 | 0xF0, 0xEE, 0xC2, 0x4A, 0x80, 0x68, 0xBE, 0xE8, 0x2E, 0x00, 0xD0, 0xD1, 0x02, | |
89 | 0x9E, 0x7E, 0x57, 0x6E, 0xEC, 0x5D, 0x2D, 0x29, 0x80, 0x6F, 0xAB, 0x93, 0xB8, | |
90 | 0xE6, 0x36, 0xCF, 0xEB, 0x31, 0xAE | |
91 | }; | |
92 | ||
93 | /** | |
94 | * Generates 'connect' call and sends it to the server. | |
95 | */ | |
96 | static void gen_connect(URLContext *s, RTMPContext *rt, const char *proto, | |
5e9ad759 | 97 | const char *host, int port) |
9fd6b843 KS |
98 | { |
99 | RTMPPacket pkt; | |
100 | uint8_t ver[32], *p; | |
101 | char tcurl[512]; | |
102 | ||
31da5966 | 103 | ff_rtmp_packet_create(&pkt, RTMP_SYSTEM_CHANNEL, RTMP_PT_INVOKE, 0, 4096); |
9fd6b843 KS |
104 | p = pkt.data; |
105 | ||
5e9ad759 | 106 | snprintf(tcurl, sizeof(tcurl), "%s://%s:%d/%s", proto, host, port, rt->app); |
9fd6b843 KS |
107 | ff_amf_write_string(&p, "connect"); |
108 | ff_amf_write_number(&p, 1.0); | |
109 | ff_amf_write_object_start(&p); | |
110 | ff_amf_write_field_name(&p, "app"); | |
5e9ad759 | 111 | ff_amf_write_string(&p, rt->app); |
9fd6b843 KS |
112 | |
113 | snprintf(ver, sizeof(ver), "%s %d,%d,%d,%d", RTMP_CLIENT_PLATFORM, RTMP_CLIENT_VER1, | |
114 | RTMP_CLIENT_VER2, RTMP_CLIENT_VER3, RTMP_CLIENT_VER4); | |
115 | ff_amf_write_field_name(&p, "flashVer"); | |
116 | ff_amf_write_string(&p, ver); | |
117 | ff_amf_write_field_name(&p, "tcUrl"); | |
118 | ff_amf_write_string(&p, tcurl); | |
119 | ff_amf_write_field_name(&p, "fpad"); | |
120 | ff_amf_write_bool(&p, 0); | |
121 | ff_amf_write_field_name(&p, "capabilities"); | |
122 | ff_amf_write_number(&p, 15.0); | |
123 | ff_amf_write_field_name(&p, "audioCodecs"); | |
124 | ff_amf_write_number(&p, 1639.0); | |
125 | ff_amf_write_field_name(&p, "videoCodecs"); | |
126 | ff_amf_write_number(&p, 252.0); | |
127 | ff_amf_write_field_name(&p, "videoFunction"); | |
128 | ff_amf_write_number(&p, 1.0); | |
129 | ff_amf_write_object_end(&p); | |
130 | ||
131 | pkt.data_size = p - pkt.data; | |
132 | ||
133 | ff_rtmp_packet_write(rt->stream, &pkt, rt->chunk_size, rt->prev_pkt[1]); | |
134 | } | |
135 | ||
136 | /** | |
137 | * Generates 'createStream' call and sends it to the server. It should make | |
138 | * the server allocate some channel for media streams. | |
139 | */ | |
140 | static void gen_create_stream(URLContext *s, RTMPContext *rt) | |
141 | { | |
142 | RTMPPacket pkt; | |
143 | uint8_t *p; | |
144 | ||
145 | av_log(LOG_CONTEXT, AV_LOG_DEBUG, "Creating stream...\n"); | |
31da5966 | 146 | ff_rtmp_packet_create(&pkt, RTMP_SYSTEM_CHANNEL, RTMP_PT_INVOKE, 0, 25); |
9fd6b843 KS |
147 | |
148 | p = pkt.data; | |
149 | ff_amf_write_string(&p, "createStream"); | |
150 | ff_amf_write_number(&p, 3.0); | |
151 | ff_amf_write_null(&p); | |
152 | ||
153 | ff_rtmp_packet_write(rt->stream, &pkt, rt->chunk_size, rt->prev_pkt[1]); | |
154 | ff_rtmp_packet_destroy(&pkt); | |
155 | } | |
156 | ||
157 | /** | |
158 | * Generates 'play' call and sends it to the server, then pings the server | |
159 | * to start actual playing. | |
160 | */ | |
161 | static void gen_play(URLContext *s, RTMPContext *rt) | |
162 | { | |
163 | RTMPPacket pkt; | |
164 | uint8_t *p; | |
165 | ||
166 | av_log(LOG_CONTEXT, AV_LOG_DEBUG, "Sending play command for '%s'\n", rt->playpath); | |
167 | ff_rtmp_packet_create(&pkt, RTMP_VIDEO_CHANNEL, RTMP_PT_INVOKE, 0, | |
f836fa17 | 168 | 20 + strlen(rt->playpath)); |
9fd6b843 KS |
169 | pkt.extra = rt->main_channel_id; |
170 | ||
171 | p = pkt.data; | |
172 | ff_amf_write_string(&p, "play"); | |
173 | ff_amf_write_number(&p, 0.0); | |
174 | ff_amf_write_null(&p); | |
175 | ff_amf_write_string(&p, rt->playpath); | |
9fd6b843 KS |
176 | |
177 | ff_rtmp_packet_write(rt->stream, &pkt, rt->chunk_size, rt->prev_pkt[1]); | |
178 | ff_rtmp_packet_destroy(&pkt); | |
179 | ||
180 | // set client buffer time disguised in ping packet | |
181 | ff_rtmp_packet_create(&pkt, RTMP_NETWORK_CHANNEL, RTMP_PT_PING, 1, 10); | |
182 | ||
183 | p = pkt.data; | |
184 | bytestream_put_be16(&p, 3); | |
185 | bytestream_put_be32(&p, 1); | |
186 | bytestream_put_be32(&p, 256); //TODO: what is a good value here? | |
187 | ||
188 | ff_rtmp_packet_write(rt->stream, &pkt, rt->chunk_size, rt->prev_pkt[1]); | |
189 | ff_rtmp_packet_destroy(&pkt); | |
190 | } | |
191 | ||
192 | /** | |
193 | * Generates ping reply and sends it to the server. | |
194 | */ | |
195 | static void gen_pong(URLContext *s, RTMPContext *rt, RTMPPacket *ppkt) | |
196 | { | |
197 | RTMPPacket pkt; | |
198 | uint8_t *p; | |
199 | ||
200 | ff_rtmp_packet_create(&pkt, RTMP_NETWORK_CHANNEL, RTMP_PT_PING, ppkt->timestamp + 1, 6); | |
201 | p = pkt.data; | |
202 | bytestream_put_be16(&p, 7); | |
203 | bytestream_put_be32(&p, AV_RB32(ppkt->data+2) + 1); | |
204 | ff_rtmp_packet_write(rt->stream, &pkt, rt->chunk_size, rt->prev_pkt[1]); | |
205 | ff_rtmp_packet_destroy(&pkt); | |
206 | } | |
207 | ||
208 | //TODO: Move HMAC code somewhere. Eventually. | |
209 | #define HMAC_IPAD_VAL 0x36 | |
210 | #define HMAC_OPAD_VAL 0x5C | |
211 | ||
212 | /** | |
213 | * Calculates HMAC-SHA2 digest for RTMP handshake packets. | |
214 | * | |
215 | * @param src input buffer | |
216 | * @param len input buffer length (should be 1536) | |
217 | * @param gap offset in buffer where 32 bytes should not be taken into account | |
218 | * when calculating digest (since it will be used to store that digest) | |
219 | * @param key digest key | |
220 | * @param keylen digest key length | |
221 | * @param dst buffer where calculated digest will be stored (32 bytes) | |
222 | */ | |
223 | static void rtmp_calc_digest(const uint8_t *src, int len, int gap, | |
224 | const uint8_t *key, int keylen, uint8_t *dst) | |
225 | { | |
226 | struct AVSHA *sha; | |
227 | uint8_t hmac_buf[64+32] = {0}; | |
228 | int i; | |
229 | ||
230 | sha = av_mallocz(av_sha_size); | |
231 | ||
232 | if (keylen < 64) { | |
233 | memcpy(hmac_buf, key, keylen); | |
234 | } else { | |
235 | av_sha_init(sha, 256); | |
236 | av_sha_update(sha,key, keylen); | |
237 | av_sha_final(sha, hmac_buf); | |
238 | } | |
239 | for (i = 0; i < 64; i++) | |
240 | hmac_buf[i] ^= HMAC_IPAD_VAL; | |
241 | ||
242 | av_sha_init(sha, 256); | |
243 | av_sha_update(sha, hmac_buf, 64); | |
244 | if (gap <= 0) { | |
245 | av_sha_update(sha, src, len); | |
246 | } else { //skip 32 bytes used for storing digest | |
247 | av_sha_update(sha, src, gap); | |
248 | av_sha_update(sha, src + gap + 32, len - gap - 32); | |
249 | } | |
250 | av_sha_final(sha, hmac_buf + 64); | |
251 | ||
252 | for (i = 0; i < 64; i++) | |
253 | hmac_buf[i] ^= HMAC_IPAD_VAL ^ HMAC_OPAD_VAL; //reuse XORed key for opad | |
254 | av_sha_init(sha, 256); | |
255 | av_sha_update(sha, hmac_buf, 64+32); | |
256 | av_sha_final(sha, dst); | |
257 | ||
258 | av_free(sha); | |
259 | } | |
260 | ||
261 | /** | |
262 | * Puts HMAC-SHA2 digest of packet data (except for the bytes where this digest | |
263 | * will be stored) into that packet. | |
264 | * | |
265 | * @param buf handshake data (1536 bytes) | |
266 | * @return offset to the digest inside input data | |
267 | */ | |
268 | static int rtmp_handshake_imprint_with_digest(uint8_t *buf) | |
269 | { | |
270 | int i, digest_pos = 0; | |
271 | ||
272 | for (i = 8; i < 12; i++) | |
273 | digest_pos += buf[i]; | |
274 | digest_pos = (digest_pos % 728) + 12; | |
275 | ||
276 | rtmp_calc_digest(buf, RTMP_HANDSHAKE_PACKET_SIZE, digest_pos, | |
277 | rtmp_player_key, PLAYER_KEY_OPEN_PART_LEN, | |
278 | buf + digest_pos); | |
279 | return digest_pos; | |
280 | } | |
281 | ||
282 | /** | |
283 | * Verifies that the received server response has the expected digest value. | |
284 | * | |
285 | * @param buf handshake data received from the server (1536 bytes) | |
286 | * @param off position to search digest offset from | |
287 | * @return 0 if digest is valid, digest position otherwise | |
288 | */ | |
289 | static int rtmp_validate_digest(uint8_t *buf, int off) | |
290 | { | |
291 | int i, digest_pos = 0; | |
292 | uint8_t digest[32]; | |
293 | ||
294 | for (i = 0; i < 4; i++) | |
295 | digest_pos += buf[i + off]; | |
296 | digest_pos = (digest_pos % 728) + off + 4; | |
297 | ||
298 | rtmp_calc_digest(buf, RTMP_HANDSHAKE_PACKET_SIZE, digest_pos, | |
299 | rtmp_server_key, SERVER_KEY_OPEN_PART_LEN, | |
300 | digest); | |
301 | if (!memcmp(digest, buf + digest_pos, 32)) | |
302 | return digest_pos; | |
303 | return 0; | |
304 | } | |
305 | ||
306 | /** | |
307 | * Performs handshake with the server by means of exchanging pseudorandom data | |
308 | * signed with HMAC-SHA2 digest. | |
309 | * | |
310 | * @return 0 if handshake succeeds, negative value otherwise | |
311 | */ | |
312 | static int rtmp_handshake(URLContext *s, RTMPContext *rt) | |
313 | { | |
314 | AVLFG rnd; | |
315 | uint8_t tosend [RTMP_HANDSHAKE_PACKET_SIZE+1] = { | |
316 | 3, // unencrypted data | |
317 | 0, 0, 0, 0, // client uptime | |
318 | RTMP_CLIENT_VER1, | |
319 | RTMP_CLIENT_VER2, | |
320 | RTMP_CLIENT_VER3, | |
321 | RTMP_CLIENT_VER4, | |
322 | }; | |
323 | uint8_t clientdata[RTMP_HANDSHAKE_PACKET_SIZE]; | |
324 | uint8_t serverdata[RTMP_HANDSHAKE_PACKET_SIZE+1]; | |
325 | int i; | |
326 | int server_pos, client_pos; | |
327 | uint8_t digest[32]; | |
328 | ||
329 | av_log(LOG_CONTEXT, AV_LOG_DEBUG, "Handshaking...\n"); | |
330 | ||
331 | av_lfg_init(&rnd, 0xDEADC0DE); | |
332 | // generate handshake packet - 1536 bytes of pseudorandom data | |
333 | for (i = 9; i <= RTMP_HANDSHAKE_PACKET_SIZE; i++) | |
334 | tosend[i] = av_lfg_get(&rnd) >> 24; | |
335 | client_pos = rtmp_handshake_imprint_with_digest(tosend + 1); | |
336 | ||
337 | url_write(rt->stream, tosend, RTMP_HANDSHAKE_PACKET_SIZE + 1); | |
338 | i = url_read_complete(rt->stream, serverdata, RTMP_HANDSHAKE_PACKET_SIZE + 1); | |
339 | if (i != RTMP_HANDSHAKE_PACKET_SIZE + 1) { | |
340 | av_log(LOG_CONTEXT, AV_LOG_ERROR, "Cannot read RTMP handshake response\n"); | |
341 | return -1; | |
342 | } | |
343 | i = url_read_complete(rt->stream, clientdata, RTMP_HANDSHAKE_PACKET_SIZE); | |
344 | if (i != RTMP_HANDSHAKE_PACKET_SIZE) { | |
345 | av_log(LOG_CONTEXT, AV_LOG_ERROR, "Cannot read RTMP handshake response\n"); | |
346 | return -1; | |
347 | } | |
348 | ||
349 | av_log(LOG_CONTEXT, AV_LOG_DEBUG, "Server version %d.%d.%d.%d\n", | |
350 | serverdata[5], serverdata[6], serverdata[7], serverdata[8]); | |
351 | ||
352 | server_pos = rtmp_validate_digest(serverdata + 1, 772); | |
353 | if (!server_pos) { | |
354 | server_pos = rtmp_validate_digest(serverdata + 1, 8); | |
355 | if (!server_pos) { | |
356 | av_log(LOG_CONTEXT, AV_LOG_ERROR, "Server response validating failed\n"); | |
357 | return -1; | |
358 | } | |
359 | } | |
360 | ||
361 | rtmp_calc_digest(tosend + 1 + client_pos, 32, 0, | |
362 | rtmp_server_key, sizeof(rtmp_server_key), | |
363 | digest); | |
364 | rtmp_calc_digest(clientdata, RTMP_HANDSHAKE_PACKET_SIZE-32, 0, | |
365 | digest, 32, | |
366 | digest); | |
367 | if (memcmp(digest, clientdata + RTMP_HANDSHAKE_PACKET_SIZE - 32, 32)) { | |
368 | av_log(LOG_CONTEXT, AV_LOG_ERROR, "Signature mismatch\n"); | |
369 | return -1; | |
370 | } | |
371 | ||
372 | for (i = 0; i < RTMP_HANDSHAKE_PACKET_SIZE; i++) | |
373 | tosend[i] = av_lfg_get(&rnd) >> 24; | |
374 | rtmp_calc_digest(serverdata + 1 + server_pos, 32, 0, | |
375 | rtmp_player_key, sizeof(rtmp_player_key), | |
376 | digest); | |
377 | rtmp_calc_digest(tosend, RTMP_HANDSHAKE_PACKET_SIZE - 32, 0, | |
378 | digest, 32, | |
379 | tosend + RTMP_HANDSHAKE_PACKET_SIZE - 32); | |
380 | ||
381 | // write reply back to the server | |
382 | url_write(rt->stream, tosend, RTMP_HANDSHAKE_PACKET_SIZE); | |
383 | return 0; | |
384 | } | |
385 | ||
386 | /** | |
387 | * Parses received packet and may perform some action depending on | |
388 | * the packet contents. | |
389 | * @return 0 for no errors, negative values for serious errors which prevent | |
390 | * further communications, positive values for uncritical errors | |
391 | */ | |
392 | static int rtmp_parse_result(URLContext *s, RTMPContext *rt, RTMPPacket *pkt) | |
393 | { | |
394 | int i, t; | |
395 | const uint8_t *data_end = pkt->data + pkt->data_size; | |
396 | ||
397 | switch (pkt->type) { | |
398 | case RTMP_PT_CHUNK_SIZE: | |
399 | if (pkt->data_size != 4) { | |
400 | av_log(LOG_CONTEXT, AV_LOG_ERROR, | |
401 | "Chunk size change packet is not 4 bytes long (%d)\n", pkt->data_size); | |
402 | return -1; | |
403 | } | |
404 | rt->chunk_size = AV_RB32(pkt->data); | |
405 | if (rt->chunk_size <= 0) { | |
406 | av_log(LOG_CONTEXT, AV_LOG_ERROR, "Incorrect chunk size %d\n", rt->chunk_size); | |
407 | return -1; | |
408 | } | |
409 | av_log(LOG_CONTEXT, AV_LOG_DEBUG, "New chunk size = %d\n", rt->chunk_size); | |
410 | break; | |
411 | case RTMP_PT_PING: | |
412 | t = AV_RB16(pkt->data); | |
413 | if (t == 6) | |
414 | gen_pong(s, rt, pkt); | |
415 | break; | |
416 | case RTMP_PT_INVOKE: | |
417 | //TODO: check for the messages sent for wrong state? | |
418 | if (!memcmp(pkt->data, "\002\000\006_error", 9)) { | |
419 | uint8_t tmpstr[256]; | |
420 | ||
421 | if (!ff_amf_get_field_value(pkt->data + 9, data_end, | |
422 | "description", tmpstr, sizeof(tmpstr))) | |
423 | av_log(LOG_CONTEXT, AV_LOG_ERROR, "Server error: %s\n",tmpstr); | |
424 | return -1; | |
425 | } else if (!memcmp(pkt->data, "\002\000\007_result", 10)) { | |
426 | switch (rt->state) { | |
427 | case STATE_HANDSHAKED: | |
428 | gen_create_stream(s, rt); | |
429 | rt->state = STATE_CONNECTING; | |
430 | break; | |
431 | case STATE_CONNECTING: | |
432 | //extract a number from the result | |
433 | if (pkt->data[10] || pkt->data[19] != 5 || pkt->data[20]) { | |
434 | av_log(LOG_CONTEXT, AV_LOG_WARNING, "Unexpected reply on connect()\n"); | |
435 | } else { | |
436 | rt->main_channel_id = (int) av_int2dbl(AV_RB64(pkt->data + 21)); | |
437 | } | |
438 | gen_play(s, rt); | |
439 | rt->state = STATE_READY; | |
440 | break; | |
441 | } | |
442 | } else if (!memcmp(pkt->data, "\002\000\010onStatus", 11)) { | |
443 | const uint8_t* ptr = pkt->data + 11; | |
444 | uint8_t tmpstr[256]; | |
9fd6b843 KS |
445 | |
446 | for (i = 0; i < 2; i++) { | |
447 | t = ff_amf_tag_size(ptr, data_end); | |
448 | if (t < 0) | |
449 | return 1; | |
450 | ptr += t; | |
451 | } | |
452 | t = ff_amf_get_field_value(ptr, data_end, | |
453 | "level", tmpstr, sizeof(tmpstr)); | |
454 | if (!t && !strcmp(tmpstr, "error")) { | |
455 | if (!ff_amf_get_field_value(ptr, data_end, | |
456 | "description", tmpstr, sizeof(tmpstr))) | |
457 | av_log(LOG_CONTEXT, AV_LOG_ERROR, "Server error: %s\n",tmpstr); | |
458 | return -1; | |
459 | } | |
460 | t = ff_amf_get_field_value(ptr, data_end, | |
461 | "code", tmpstr, sizeof(tmpstr)); | |
462 | if (!t && !strcmp(tmpstr, "NetStream.Play.Start")) { | |
463 | rt->state = STATE_PLAYING; | |
464 | return 0; | |
465 | } | |
466 | } | |
467 | break; | |
468 | } | |
469 | return 0; | |
470 | } | |
471 | ||
472 | /** | |
473 | * Interacts with the server by receiving and sending RTMP packets until | |
474 | * there is some significant data (media data or expected status notification). | |
475 | * | |
476 | * @param s reading context | |
1d8041b3 SS |
477 | * @param for_header non-zero value tells function to work until it |
478 | * gets notification from the server that playing has been started, | |
479 | * otherwise function will work until some media data is received (or | |
480 | * an error happens) | |
9fd6b843 KS |
481 | * @return 0 for successful operation, negative value in case of error |
482 | */ | |
483 | static int get_packet(URLContext *s, int for_header) | |
484 | { | |
485 | RTMPContext *rt = s->priv_data; | |
486 | int ret; | |
487 | ||
488 | for(;;) { | |
489 | RTMPPacket rpkt; | |
490 | if ((ret = ff_rtmp_packet_read(rt->stream, &rpkt, | |
491 | rt->chunk_size, rt->prev_pkt[0])) != 0) { | |
492 | if (ret > 0) { | |
493 | return AVERROR(EAGAIN); | |
494 | } else { | |
495 | return AVERROR(EIO); | |
496 | } | |
497 | } | |
498 | ||
499 | ret = rtmp_parse_result(s, rt, &rpkt); | |
500 | if (ret < 0) {//serious error in current packet | |
501 | ff_rtmp_packet_destroy(&rpkt); | |
502 | return -1; | |
503 | } | |
504 | if (for_header && rt->state == STATE_PLAYING) { | |
505 | ff_rtmp_packet_destroy(&rpkt); | |
506 | return 0; | |
507 | } | |
508 | if (!rpkt.data_size) { | |
509 | ff_rtmp_packet_destroy(&rpkt); | |
510 | continue; | |
511 | } | |
512 | if (rpkt.type == RTMP_PT_VIDEO || rpkt.type == RTMP_PT_AUDIO || | |
afbacb93 | 513 | (rpkt.type == RTMP_PT_NOTIFY && !memcmp("\002\000\012onMetaData", rpkt.data, 13))) { |
9fd6b843 KS |
514 | uint8_t *p; |
515 | uint32_t ts = rpkt.timestamp; | |
516 | ||
9fd6b843 KS |
517 | // generate packet header and put data into buffer for FLV demuxer |
518 | rt->flv_off = 0; | |
519 | rt->flv_size = rpkt.data_size + 15; | |
520 | rt->flv_data = p = av_realloc(rt->flv_data, rt->flv_size); | |
521 | bytestream_put_byte(&p, rpkt.type); | |
522 | bytestream_put_be24(&p, rpkt.data_size); | |
523 | bytestream_put_be24(&p, ts); | |
524 | bytestream_put_byte(&p, ts >> 24); | |
525 | bytestream_put_be24(&p, 0); | |
526 | bytestream_put_buffer(&p, rpkt.data, rpkt.data_size); | |
527 | bytestream_put_be32(&p, 0); | |
528 | ff_rtmp_packet_destroy(&rpkt); | |
529 | return 0; | |
530 | } else if (rpkt.type == RTMP_PT_METADATA) { | |
531 | // we got raw FLV data, make it available for FLV demuxer | |
532 | rt->flv_off = 0; | |
533 | rt->flv_size = rpkt.data_size; | |
534 | rt->flv_data = av_realloc(rt->flv_data, rt->flv_size); | |
535 | memcpy(rt->flv_data, rpkt.data, rpkt.data_size); | |
536 | ff_rtmp_packet_destroy(&rpkt); | |
537 | return 0; | |
538 | } | |
539 | ff_rtmp_packet_destroy(&rpkt); | |
540 | } | |
541 | return 0; | |
542 | } | |
543 | ||
544 | static int rtmp_close(URLContext *h) | |
545 | { | |
546 | RTMPContext *rt = h->priv_data; | |
547 | ||
548 | av_freep(&rt->flv_data); | |
549 | url_close(rt->stream); | |
550 | av_free(rt); | |
551 | return 0; | |
552 | } | |
553 | ||
554 | /** | |
555 | * Opens RTMP connection and verifies that the stream can be played. | |
556 | * | |
557 | * URL syntax: rtmp://server[:port][/app][/playpath] | |
558 | * where 'app' is first one or two directories in the path | |
559 | * (e.g. /ondemand/, /flash/live/, etc.) | |
560 | * and 'playpath' is a file name (the rest of the path, | |
561 | * may be prefixed with "mp4:") | |
562 | */ | |
563 | static int rtmp_open(URLContext *s, const char *uri, int flags) | |
564 | { | |
565 | RTMPContext *rt; | |
5e9ad759 | 566 | char proto[8], hostname[256], path[1024], *fname; |
9fd6b843 | 567 | uint8_t buf[2048]; |
b316991b | 568 | int port; |
9fd6b843 KS |
569 | int ret; |
570 | ||
9fd6b843 KS |
571 | rt = av_mallocz(sizeof(RTMPContext)); |
572 | if (!rt) | |
573 | return AVERROR(ENOMEM); | |
574 | s->priv_data = rt; | |
b316991b | 575 | rt->is_input = !(flags & URL_WRONLY); |
9fd6b843 KS |
576 | |
577 | url_split(proto, sizeof(proto), NULL, 0, hostname, sizeof(hostname), &port, | |
578 | path, sizeof(path), s->filename); | |
579 | ||
580 | if (port < 0) | |
581 | port = RTMP_DEFAULT_PORT; | |
582 | snprintf(buf, sizeof(buf), "tcp://%s:%d", hostname, port); | |
583 | ||
fe523958 KS |
584 | if (url_open(&rt->stream, buf, URL_RDWR) < 0) { |
585 | av_log(LOG_CONTEXT, AV_LOG_ERROR, "Cannot open connection %s\n", buf); | |
9fd6b843 | 586 | goto fail; |
fe523958 | 587 | } |
9fd6b843 | 588 | |
b316991b | 589 | if (!rt->is_input) { |
9fd6b843 KS |
590 | av_log(LOG_CONTEXT, AV_LOG_ERROR, "RTMP output is not supported yet.\n"); |
591 | goto fail; | |
592 | } else { | |
593 | rt->state = STATE_START; | |
594 | if (rtmp_handshake(s, rt)) | |
595 | return -1; | |
596 | ||
597 | rt->chunk_size = 128; | |
598 | rt->state = STATE_HANDSHAKED; | |
599 | //extract "app" part from path | |
600 | if (!strncmp(path, "/ondemand/", 10)) { | |
601 | fname = path + 10; | |
5e9ad759 | 602 | memcpy(rt->app, "ondemand", 9); |
9fd6b843 KS |
603 | } else { |
604 | char *p = strchr(path + 1, '/'); | |
605 | if (!p) { | |
606 | fname = path + 1; | |
5e9ad759 | 607 | rt->app[0] = '\0'; |
9fd6b843 | 608 | } else { |
f68c8a50 | 609 | char *c = strchr(p + 1, ':'); |
9fd6b843 | 610 | fname = strchr(p + 1, '/'); |
f68c8a50 | 611 | if (!fname || c < fname) { |
9fd6b843 | 612 | fname = p + 1; |
5e9ad759 | 613 | av_strlcpy(rt->app, path + 1, p - path); |
9fd6b843 KS |
614 | } else { |
615 | fname++; | |
5e9ad759 | 616 | av_strlcpy(rt->app, path + 1, fname - path - 1); |
9fd6b843 KS |
617 | } |
618 | } | |
619 | } | |
f68c8a50 LT |
620 | if (!strchr(fname, ':') && |
621 | (!strcmp(fname + strlen(fname) - 4, ".f4v") || | |
622 | !strcmp(fname + strlen(fname) - 4, ".mp4"))) { | |
9fd6b843 KS |
623 | memcpy(rt->playpath, "mp4:", 5); |
624 | } else { | |
625 | rt->playpath[0] = 0; | |
626 | } | |
627 | strncat(rt->playpath, fname, sizeof(rt->playpath) - 5); | |
628 | ||
629 | av_log(LOG_CONTEXT, AV_LOG_DEBUG, "Proto = %s, path = %s, app = %s, fname = %s\n", | |
5e9ad759 S |
630 | proto, path, rt->app, rt->playpath); |
631 | gen_connect(s, rt, proto, hostname, port); | |
9fd6b843 KS |
632 | |
633 | do { | |
634 | ret = get_packet(s, 1); | |
635 | } while (ret == EAGAIN); | |
636 | if (ret < 0) | |
637 | goto fail; | |
638 | // generate FLV header for demuxer | |
639 | rt->flv_size = 13; | |
640 | rt->flv_data = av_realloc(rt->flv_data, rt->flv_size); | |
641 | rt->flv_off = 0; | |
642 | memcpy(rt->flv_data, "FLV\1\5\0\0\0\011\0\0\0\0", rt->flv_size); | |
643 | } | |
644 | ||
645 | s->max_packet_size = url_get_max_packet_size(rt->stream); | |
646 | s->is_streamed = 1; | |
647 | return 0; | |
648 | ||
649 | fail: | |
650 | rtmp_close(s); | |
651 | return AVERROR(EIO); | |
652 | } | |
653 | ||
654 | static int rtmp_read(URLContext *s, uint8_t *buf, int size) | |
655 | { | |
656 | RTMPContext *rt = s->priv_data; | |
657 | int orig_size = size; | |
658 | int ret; | |
659 | ||
660 | while (size > 0) { | |
661 | int data_left = rt->flv_size - rt->flv_off; | |
662 | ||
663 | if (data_left >= size) { | |
664 | memcpy(buf, rt->flv_data + rt->flv_off, size); | |
665 | rt->flv_off += size; | |
666 | return orig_size; | |
667 | } | |
668 | if (data_left > 0) { | |
669 | memcpy(buf, rt->flv_data + rt->flv_off, data_left); | |
670 | buf += data_left; | |
671 | size -= data_left; | |
672 | rt->flv_off = rt->flv_size; | |
673 | } | |
674 | if ((ret = get_packet(s, 0)) < 0) | |
675 | return ret; | |
676 | } | |
677 | return orig_size; | |
678 | } | |
679 | ||
680 | static int rtmp_write(URLContext *h, uint8_t *buf, int size) | |
681 | { | |
682 | return 0; | |
683 | } | |
684 | ||
685 | URLProtocol rtmp_protocol = { | |
686 | "rtmp", | |
687 | rtmp_open, | |
688 | rtmp_read, | |
689 | rtmp_write, | |
690 | NULL, /* seek */ | |
691 | rtmp_close, | |
692 | }; |