Do not crash on frame size changes.
[libav.git] / libavformat / rtmpproto.c
CommitLineData
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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
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 */
56typedef 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
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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
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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 */
72static 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 */
83static 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 */
96static void gen_connect(URLContext *s, RTMPContext *rt, const char *proto,
5e9ad759 97 const char *host, int port)
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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);
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104 p = pkt.data;
105
5e9ad759 106 snprintf(tcurl, sizeof(tcurl), "%s://%s:%d/%s", proto, host, port, rt->app);
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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);
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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 */
140static 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);
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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 */
161static 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));
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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);
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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 */
195static 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 */
223static 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 */
268static 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 */
289static 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 */
312static 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 */
392static 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];
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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
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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)
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481 * @return 0 for successful operation, negative value in case of error
482 */
483static 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))) {
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514 uint8_t *p;
515 uint32_t ts = rpkt.timestamp;
516
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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
544static 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 */
563static 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;
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569 int ret;
570
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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);
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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
649fail:
650 rtmp_close(s);
651 return AVERROR(EIO);
652}
653
654static 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
680static int rtmp_write(URLContext *h, uint8_t *buf, int size)
681{
682 return 0;
683}
684
685URLProtocol rtmp_protocol = {
686 "rtmp",
687 rtmp_open,
688 rtmp_read,
689 rtmp_write,
690 NULL, /* seek */
691 rtmp_close,
692};