1 /*
2 * MMS protocol over TCP
3 * Copyright (c) 2006,2007 Ryan Martell
4 * Copyright (c) 2007 Björn Axelsson
5 * Copyright (c) 2010 Zhentan Feng <spyfeng at gmail dot com>
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 /* References
25 * MMS protocol specification:
26 * [1]http://msdn.microsoft.com/en-us/library/cc234711(PROT.10).aspx
27 * ASF specification. Revision 01.20.03.
28 * [2]http://msdn.microsoft.com/en-us/library/bb643323.aspx
29 */
30
31 #include "avformat.h"
32 #include "mms.h"
33 #include "internal.h"
34 #include "avio_internal.h"
35 #include "libavutil/intreadwrite.h"
36 #include "libavcodec/bytestream.h"
37 #include "network.h"
38 #include "url.h"
39
40 #define LOCAL_ADDRESS 0xc0a80081 // FIXME get and use correct local ip address.
41 #define LOCAL_PORT 1037 // as above.
42 /** Client to server packet types. */
43 typedef enum {
44 CS_PKT_INITIAL = 0x01,
45 CS_PKT_PROTOCOL_SELECT = 0x02,
46 CS_PKT_MEDIA_FILE_REQUEST = 0x05,
47 CS_PKT_START_FROM_PKT_ID = 0x07,
48 CS_PKT_STREAM_PAUSE = 0x09,
49 CS_PKT_STREAM_CLOSE = 0x0d,
50 CS_PKT_MEDIA_HEADER_REQUEST = 0x15,
51 CS_PKT_TIMING_DATA_REQUEST = 0x18,
52 CS_PKT_USER_PASSWORD = 0x1a,
53 CS_PKT_KEEPALIVE = 0x1b,
54 CS_PKT_STREAM_ID_REQUEST = 0x33,
55 } MMSCSPacketType;
56
57 /** Server to client packet types. */
58 typedef enum {
59 /** Control packets. */
60 /*@{*/
61 SC_PKT_CLIENT_ACCEPTED = 0x01,
62 SC_PKT_PROTOCOL_ACCEPTED = 0x02,
63 SC_PKT_PROTOCOL_FAILED = 0x03,
64 SC_PKT_MEDIA_PKT_FOLLOWS = 0x05,
65 SC_PKT_MEDIA_FILE_DETAILS = 0x06,
66 SC_PKT_HEADER_REQUEST_ACCEPTED = 0x11,
67 SC_PKT_TIMING_TEST_REPLY = 0x15,
68 SC_PKT_PASSWORD_REQUIRED = 0x1a,
69 SC_PKT_KEEPALIVE = 0x1b,
70 SC_PKT_STREAM_STOPPED = 0x1e,
71 SC_PKT_STREAM_CHANGING = 0x20,
72 SC_PKT_STREAM_ID_ACCEPTED = 0x21,
73 /*@}*/
74
75 /** Pseudo packets. */
76 /*@{*/
77 SC_PKT_CANCEL = -1,
78 SC_PKT_NO_DATA = -2,
79 /*@}*/
80
81 /** Data packets. */
82 /*@{*/
83 SC_PKT_ASF_HEADER = 0x010000,// make it bigger than 0xFF in case of
84 SC_PKT_ASF_MEDIA = 0x010001,// receiving false data packets.
85 /*@}*/
86 } MMSSCPacketType;
87
88 typedef struct MMSTContext {
89 MMSContext mms;
90 int outgoing_packet_seq; ///< Outgoing packet sequence number.
91 char path[256]; ///< Path of the resource being asked for.
92 char host[128]; ///< Host of the resources.
93 int incoming_packet_seq; ///< Incoming packet sequence number.
94 int incoming_flags; ///< Incoming packet flags.
95 int packet_id; ///< Identifier for packets in the current stream.
96 unsigned int header_packet_id; ///< default is 2.
97 } MMSTContext;
98
99 /** Create MMST command packet header */
start_command_packet(MMSTContext * mmst,MMSCSPacketType packet_type)100 static void start_command_packet(MMSTContext *mmst, MMSCSPacketType packet_type)
101 {
102 MMSContext *mms = &mmst->mms;
103 mms->write_out_ptr = mms->out_buffer;
104
105 bytestream_put_le32(&mms->write_out_ptr, 1); // start sequence
106 bytestream_put_le32(&mms->write_out_ptr, 0xb00bface);
107 bytestream_put_le32(&mms->write_out_ptr, 0); // Length starts from after the protocol type bytes
108 bytestream_put_le32(&mms->write_out_ptr, MKTAG('M','M','S',' '));
109 bytestream_put_le32(&mms->write_out_ptr, 0);
110 bytestream_put_le32(&mms->write_out_ptr, mmst->outgoing_packet_seq++);
111 bytestream_put_le64(&mms->write_out_ptr, 0); // timestamp
112 bytestream_put_le32(&mms->write_out_ptr, 0);
113 bytestream_put_le16(&mms->write_out_ptr, packet_type);
114 bytestream_put_le16(&mms->write_out_ptr, 3); // direction to server
115 }
116
117 /** Add prefixes to MMST command packet. */
insert_command_prefixes(MMSContext * mms,uint32_t prefix1,uint32_t prefix2)118 static void insert_command_prefixes(MMSContext *mms,
119 uint32_t prefix1, uint32_t prefix2)
120 {
121 bytestream_put_le32(&mms->write_out_ptr, prefix1); // first prefix
122 bytestream_put_le32(&mms->write_out_ptr, prefix2); // second prefix
123 }
124
125 /** Send a prepared MMST command packet. */
send_command_packet(MMSTContext * mmst)126 static int send_command_packet(MMSTContext *mmst)
127 {
128 MMSContext *mms = &mmst->mms;
129 int len= mms->write_out_ptr - mms->out_buffer;
130 int exact_length = FFALIGN(len, 8);
131 int first_length= exact_length - 16;
132 int len8= first_length/8;
133 int write_result;
134
135 // update packet length fields.
136 AV_WL32(mms->out_buffer + 8, first_length);
137 AV_WL32(mms->out_buffer + 16, len8);
138 AV_WL32(mms->out_buffer + 32, len8-2);
139 memset(mms->write_out_ptr, 0, exact_length - len);
140
141 // write it out.
142 write_result= ffurl_write(mms->mms_hd, mms->out_buffer, exact_length);
143 if(write_result != exact_length) {
144 av_log(mms->mms_hd, AV_LOG_ERROR,
145 "Failed to write data of length %d: %d (%s)\n",
146 exact_length, write_result,
147 write_result < 0 ? strerror(AVUNERROR(write_result)) :
148 "The server closed the connection");
149 return AVERROR(EIO);
150 }
151
152 return 0;
153 }
154
mms_put_utf16(MMSContext * mms,const uint8_t * src)155 static int mms_put_utf16(MMSContext *mms, const uint8_t *src)
156 {
157 AVIOContext bic;
158 int size = mms->write_out_ptr - mms->out_buffer;
159 int len;
160 ffio_init_context(&bic, mms->write_out_ptr,
161 sizeof(mms->out_buffer) - size, 1, NULL, NULL, NULL, NULL);
162
163 len = avio_put_str16le(&bic, src);
164 if (len < 0)
165 return len;
166 mms->write_out_ptr += len;
167 return 0;
168 }
169
send_time_test_data(MMSTContext * mmst)170 static int send_time_test_data(MMSTContext *mmst)
171 {
172 start_command_packet(mmst, CS_PKT_TIMING_DATA_REQUEST);
173 insert_command_prefixes(&mmst->mms, 0x00f0f0f0, 0x0004000b);
174 return send_command_packet(mmst);
175 }
176
send_protocol_select(MMSTContext * mmst)177 static int send_protocol_select(MMSTContext *mmst)
178 {
179 int ret;
180 char data_string[256];
181 MMSContext *mms = &mmst->mms;
182
183 start_command_packet(mmst, CS_PKT_PROTOCOL_SELECT);
184 insert_command_prefixes(mms, 0, 0xffffffff);
185 bytestream_put_le32(&mms->write_out_ptr, 0); // maxFunnelBytes
186 bytestream_put_le32(&mms->write_out_ptr, 0x00989680); // maxbitRate
187 bytestream_put_le32(&mms->write_out_ptr, 2); // funnelMode
188 snprintf(data_string, sizeof(data_string), "\\\\%d.%d.%d.%d\\%s\\%d",
189 (LOCAL_ADDRESS>>24)&0xff,
190 (LOCAL_ADDRESS>>16)&0xff,
191 (LOCAL_ADDRESS>>8)&0xff,
192 LOCAL_ADDRESS&0xff,
193 "TCP", // or UDP
194 LOCAL_PORT);
195
196 if ((ret = mms_put_utf16(mms, data_string)) < 0)
197 return ret;
198 return send_command_packet(mmst);
199 }
200
send_media_file_request(MMSTContext * mmst)201 static int send_media_file_request(MMSTContext *mmst)
202 {
203 int ret;
204 MMSContext *mms = &mmst->mms;
205 start_command_packet(mmst, CS_PKT_MEDIA_FILE_REQUEST);
206 insert_command_prefixes(mms, 1, 0xffffffff);
207 bytestream_put_le32(&mms->write_out_ptr, 0);
208 bytestream_put_le32(&mms->write_out_ptr, 0);
209 if ((ret = mms_put_utf16(mms, mmst->path + 1)) < 0) // +1 for skip "/"
210 return ret;
211
212 return send_command_packet(mmst);
213 }
214
handle_packet_stream_changing_type(MMSTContext * mmst)215 static void handle_packet_stream_changing_type(MMSTContext *mmst)
216 {
217 MMSContext *mms = &mmst->mms;
218 av_log(mms->mms_hd, AV_LOG_TRACE, "Stream changing!\n");
219
220 // 40 is the packet header size, 7 is the prefix size.
221 mmst->header_packet_id= AV_RL32(mms->in_buffer + 40 + 7);
222 av_log(mms->mms_hd, AV_LOG_TRACE, "Changed header prefix to 0x%x", mmst->header_packet_id);
223 }
224
send_keepalive_packet(MMSTContext * mmst)225 static int send_keepalive_packet(MMSTContext *mmst)
226 {
227 // respond to a keepalive with a keepalive...
228 start_command_packet(mmst, CS_PKT_KEEPALIVE);
229 insert_command_prefixes(&mmst->mms, 1, 0x100FFFF);
230 return send_command_packet(mmst);
231 }
232
233 /** Pad media packets smaller than max_packet_size and/or adjust read position
234 * after a seek. */
pad_media_packet(MMSContext * mms)235 static void pad_media_packet(MMSContext *mms)
236 {
237 if(mms->remaining_in_len<mms->asf_packet_len) {
238 int padding_size = mms->asf_packet_len - mms->remaining_in_len;
239 memset(mms->in_buffer + mms->remaining_in_len, 0, padding_size);
240 mms->remaining_in_len += padding_size;
241 }
242 }
243
244 /** Read incoming MMST media, header or command packet. */
get_tcp_server_response(MMSTContext * mmst)245 static MMSSCPacketType get_tcp_server_response(MMSTContext *mmst)
246 {
247 int read_result;
248 MMSSCPacketType packet_type= -1;
249 MMSContext *mms = &mmst->mms;
250 for(;;) {
251 read_result = ffurl_read_complete(mms->mms_hd, mms->in_buffer, 8);
252 if (read_result != 8) {
253 if(read_result < 0) {
254 av_log(mms->mms_hd, AV_LOG_ERROR,
255 "Error reading packet header: %d (%s)\n",
256 read_result, strerror(AVUNERROR(read_result)));
257 packet_type = SC_PKT_CANCEL;
258 } else {
259 av_log(mms->mms_hd, AV_LOG_ERROR,
260 "The server closed the connection\n");
261 packet_type = SC_PKT_NO_DATA;
262 }
263 return packet_type;
264 }
265
266 // handle command packet.
267 if(AV_RL32(mms->in_buffer + 4)==0xb00bface) {
268 int length_remaining, hr;
269
270 mmst->incoming_flags= mms->in_buffer[3];
271 read_result= ffurl_read_complete(mms->mms_hd, mms->in_buffer+8, 4);
272 if(read_result != 4) {
273 av_log(mms->mms_hd, AV_LOG_ERROR,
274 "Reading command packet length failed: %d (%s)\n",
275 read_result,
276 read_result < 0 ? strerror(AVUNERROR(read_result)) :
277 "The server closed the connection");
278 return read_result < 0 ? read_result : AVERROR(EIO);
279 }
280
281 length_remaining= AV_RL32(mms->in_buffer+8) + 4;
282 av_log(mms->mms_hd, AV_LOG_TRACE, "Length remaining is %d\n", length_remaining);
283 // read the rest of the packet.
284 if (length_remaining < 0
285 || length_remaining > sizeof(mms->in_buffer) - 12) {
286 av_log(mms->mms_hd, AV_LOG_ERROR,
287 "Incoming packet length %d exceeds bufsize %"SIZE_SPECIFIER"\n",
288 length_remaining, sizeof(mms->in_buffer) - 12);
289 return AVERROR_INVALIDDATA;
290 }
291 read_result = ffurl_read_complete(mms->mms_hd, mms->in_buffer + 12,
292 length_remaining) ;
293 if (read_result != length_remaining) {
294 av_log(mms->mms_hd, AV_LOG_ERROR,
295 "Reading pkt data (length=%d) failed: %d (%s)\n",
296 length_remaining, read_result,
297 read_result < 0 ? strerror(AVUNERROR(read_result)) :
298 "The server closed the connection");
299 return read_result < 0 ? read_result : AVERROR(EIO);
300 }
301 packet_type= AV_RL16(mms->in_buffer+36);
302 if (read_result >= 44 && (hr = AV_RL32(mms->in_buffer + 40))) {
303 av_log(mms->mms_hd, AV_LOG_ERROR,
304 "Server sent a message with packet type 0x%x and error status code 0x%08x\n", packet_type, hr);
305 return AVERROR(EINVAL);
306 }
307 } else {
308 int length_remaining;
309 int packet_id_type;
310 int tmp;
311
312 // note we cache the first 8 bytes,
313 // then fill up the buffer with the others
314 tmp = AV_RL16(mms->in_buffer + 6);
315 length_remaining = (tmp - 8) & 0xffff;
316 mmst->incoming_packet_seq = AV_RL32(mms->in_buffer);
317 packet_id_type = mms->in_buffer[4];
318 mmst->incoming_flags = mms->in_buffer[5];
319
320 if (length_remaining < 0
321 || length_remaining > sizeof(mms->in_buffer) - 8) {
322 av_log(mms->mms_hd, AV_LOG_ERROR,
323 "Data length %d is invalid or too large (max=%"SIZE_SPECIFIER")\n",
324 length_remaining, sizeof(mms->in_buffer));
325 return AVERROR_INVALIDDATA;
326 }
327 mms->remaining_in_len = length_remaining;
328 mms->read_in_ptr = mms->in_buffer;
329 read_result= ffurl_read_complete(mms->mms_hd, mms->in_buffer, length_remaining);
330 if(read_result != length_remaining) {
331 av_log(mms->mms_hd, AV_LOG_ERROR,
332 "Failed to read packet data of size %d: %d (%s)\n",
333 length_remaining, read_result,
334 read_result < 0 ? strerror(AVUNERROR(read_result)) :
335 "The server closed the connection");
336 return read_result < 0 ? read_result : AVERROR(EIO);
337 }
338
339 // if we successfully read everything.
340 if(packet_id_type == mmst->header_packet_id) {
341 int err;
342 packet_type = SC_PKT_ASF_HEADER;
343 // Store the asf header
344 if(!mms->header_parsed) {
345 if ((err = av_reallocp(&mms->asf_header,
346 mms->asf_header_size +
347 mms->remaining_in_len)) < 0) {
348 mms->asf_header_size = 0;
349 return err;
350 }
351 memcpy(mms->asf_header + mms->asf_header_size,
352 mms->read_in_ptr, mms->remaining_in_len);
353 mms->asf_header_size += mms->remaining_in_len;
354 }
355 // 0x04 means asf header is sent in multiple packets.
356 if (mmst->incoming_flags == 0x04)
357 continue;
358 } else if(packet_id_type == mmst->packet_id) {
359 packet_type = SC_PKT_ASF_MEDIA;
360 } else {
361 av_log(mms->mms_hd, AV_LOG_TRACE, "packet id type %d is old.", packet_id_type);
362 continue;
363 }
364 }
365
366 // preprocess some packet type
367 if(packet_type == SC_PKT_KEEPALIVE) {
368 send_keepalive_packet(mmst);
369 continue;
370 } else if(packet_type == SC_PKT_STREAM_CHANGING) {
371 handle_packet_stream_changing_type(mmst);
372 } else if(packet_type == SC_PKT_ASF_MEDIA) {
373 pad_media_packet(mms);
374 }
375 return packet_type;
376 }
377 }
378
mms_safe_send_recv(MMSTContext * mmst,int (* send_fun)(MMSTContext * mmst),const MMSSCPacketType expect_type)379 static int mms_safe_send_recv(MMSTContext *mmst,
380 int (*send_fun)(MMSTContext *mmst),
381 const MMSSCPacketType expect_type)
382 {
383 MMSSCPacketType type;
384 if(send_fun) {
385 int ret = send_fun(mmst);
386 if (ret < 0) {
387 av_log(NULL, AV_LOG_TRACE, "Send Packet error before expecting recv packet %d\n", expect_type);
388 return ret;
389 }
390 }
391
392 if ((type = get_tcp_server_response(mmst)) != expect_type) {
393 av_log(NULL, AV_LOG_ERROR,
394 "Corrupt stream (unexpected packet type 0x%x, expected 0x%x)\n",
395 type, expect_type);
396 return AVERROR_INVALIDDATA;
397 } else {
398 return 0;
399 }
400 }
401
send_media_header_request(MMSTContext * mmst)402 static int send_media_header_request(MMSTContext *mmst)
403 {
404 MMSContext *mms = &mmst->mms;
405 start_command_packet(mmst, CS_PKT_MEDIA_HEADER_REQUEST);
406 insert_command_prefixes(mms, 1, 0);
407 bytestream_put_le32(&mms->write_out_ptr, 0);
408 bytestream_put_le32(&mms->write_out_ptr, 0x00800000);
409 bytestream_put_le32(&mms->write_out_ptr, 0xffffffff);
410 bytestream_put_le32(&mms->write_out_ptr, 0);
411 bytestream_put_le32(&mms->write_out_ptr, 0);
412 bytestream_put_le32(&mms->write_out_ptr, 0);
413
414 // the media preroll value in milliseconds?
415 bytestream_put_le32(&mms->write_out_ptr, 0);
416 bytestream_put_le32(&mms->write_out_ptr, 0x40AC2000);
417 bytestream_put_le32(&mms->write_out_ptr, 2);
418 bytestream_put_le32(&mms->write_out_ptr, 0);
419
420 return send_command_packet(mmst);
421 }
422
423 /** Send the initial handshake. */
send_startup_packet(MMSTContext * mmst)424 static int send_startup_packet(MMSTContext *mmst)
425 {
426 char data_string[256];
427 int ret;
428 MMSContext *mms = &mmst->mms;
429 // SubscriberName is defined in MS specification linked below.
430 // The GUID value can be any valid value.
431 // http://download.microsoft.com/
432 // download/9/5/E/95EF66AF-9026-4BB0-A41D-A4F81802D92C/%5BMS-WMSP%5D.pdf
433 snprintf(data_string, sizeof(data_string),
434 "NSPlayer/7.0.0.1956; {%s}; Host: %s",
435 "7E667F5D-A661-495E-A512-F55686DDA178", mmst->host);
436
437 start_command_packet(mmst, CS_PKT_INITIAL);
438 insert_command_prefixes(mms, 0, 0x0004000b);
439 bytestream_put_le32(&mms->write_out_ptr, 0x0003001c);
440 if ((ret = mms_put_utf16(mms, data_string)) < 0)
441 return ret;
442 return send_command_packet(mmst);
443 }
444
445 /** Send MMST stream selection command based on the AVStream->discard values. */
send_stream_selection_request(MMSTContext * mmst)446 static int send_stream_selection_request(MMSTContext *mmst)
447 {
448 int i;
449 MMSContext *mms = &mmst->mms;
450 // send the streams we want back...
451 start_command_packet(mmst, CS_PKT_STREAM_ID_REQUEST);
452 bytestream_put_le32(&mms->write_out_ptr, mms->stream_num); // stream nums
453 for(i= 0; i<mms->stream_num; i++) {
454 bytestream_put_le16(&mms->write_out_ptr, 0xffff); // flags
455 bytestream_put_le16(&mms->write_out_ptr, mms->streams[i].id); // stream id
456 bytestream_put_le16(&mms->write_out_ptr, 0); // selection
457 }
458 return send_command_packet(mmst);
459 }
460
send_close_packet(MMSTContext * mmst)461 static int send_close_packet(MMSTContext *mmst)
462 {
463 start_command_packet(mmst, CS_PKT_STREAM_CLOSE);
464 insert_command_prefixes(&mmst->mms, 1, 1);
465
466 return send_command_packet(mmst);
467 }
468
469 /** Close the MMSH/MMST connection */
mms_close(URLContext * h)470 static int mms_close(URLContext *h)
471 {
472 MMSTContext *mmst = (MMSTContext *)h->priv_data;
473 MMSContext *mms = &mmst->mms;
474 if(mms->mms_hd) {
475 send_close_packet(mmst);
476 ffurl_closep(&mms->mms_hd);
477 }
478
479 /* free all separately allocated pointers in mms */
480 av_freep(&mms->streams);
481 av_freep(&mms->asf_header);
482
483 return 0;
484 }
485
send_media_packet_request(MMSTContext * mmst)486 static int send_media_packet_request(MMSTContext *mmst)
487 {
488 MMSContext *mms = &mmst->mms;
489 start_command_packet(mmst, CS_PKT_START_FROM_PKT_ID);
490 insert_command_prefixes(mms, 1, 0x0001FFFF);
491 bytestream_put_le64(&mms->write_out_ptr, 0); // seek timestamp
492 bytestream_put_le32(&mms->write_out_ptr, 0xffffffff); // unknown
493 bytestream_put_le32(&mms->write_out_ptr, 0xffffffff); // packet offset
494 bytestream_put_byte(&mms->write_out_ptr, 0xff); // max stream time limit
495 bytestream_put_byte(&mms->write_out_ptr, 0xff); // max stream time limit
496 bytestream_put_byte(&mms->write_out_ptr, 0xff); // max stream time limit
497 bytestream_put_byte(&mms->write_out_ptr, 0x00); // stream time limit flag
498
499 mmst->packet_id++; // new packet_id
500 bytestream_put_le32(&mms->write_out_ptr, mmst->packet_id);
501 return send_command_packet(mmst);
502 }
503
504
clear_stream_buffers(MMSContext * mms)505 static void clear_stream_buffers(MMSContext *mms)
506 {
507 mms->remaining_in_len = 0;
508 mms->read_in_ptr = mms->in_buffer;
509 }
510
mms_open(URLContext * h,const char * uri,int flags)511 static int mms_open(URLContext *h, const char *uri, int flags)
512 {
513 MMSTContext *mmst = h->priv_data;
514 MMSContext *mms;
515 int port, err;
516 char tcpname[256];
517
518 h->is_streamed = 1;
519 mms = &mmst->mms;
520
521 // only for MMS over TCP, so set proto = NULL
522 av_url_split(NULL, 0, NULL, 0,
523 mmst->host, sizeof(mmst->host), &port, mmst->path,
524 sizeof(mmst->path), uri);
525
526 if(port<0)
527 port = 1755; // default MMS protocol port
528
529 // establish tcp connection.
530 ff_url_join(tcpname, sizeof(tcpname), "tcp", NULL, mmst->host, port, NULL);
531 err = ffurl_open_whitelist(&mms->mms_hd, tcpname, AVIO_FLAG_READ_WRITE,
532 &h->interrupt_callback, NULL,
533 h->protocol_whitelist, h->protocol_blacklist, h);
534 if (err)
535 goto fail;
536
537 mmst->packet_id = 3; // default, initial value.
538 mmst->header_packet_id = 2; // default, initial value.
539 err = mms_safe_send_recv(mmst, send_startup_packet, SC_PKT_CLIENT_ACCEPTED);
540 if (err)
541 goto fail;
542 err = mms_safe_send_recv(mmst, send_time_test_data, SC_PKT_TIMING_TEST_REPLY);
543 if (err)
544 goto fail;
545 err = mms_safe_send_recv(mmst, send_protocol_select, SC_PKT_PROTOCOL_ACCEPTED);
546 if (err)
547 goto fail;
548 err = mms_safe_send_recv(mmst, send_media_file_request, SC_PKT_MEDIA_FILE_DETAILS);
549 if (err)
550 goto fail;
551 err = mms_safe_send_recv(mmst, send_media_header_request, SC_PKT_HEADER_REQUEST_ACCEPTED);
552 if (err)
553 goto fail;
554 err = mms_safe_send_recv(mmst, NULL, SC_PKT_ASF_HEADER);
555 if (err)
556 goto fail;
557 if((mmst->incoming_flags != 0X08) && (mmst->incoming_flags != 0X0C)) {
558 av_log(h, AV_LOG_ERROR,
559 "The server does not support MMST (try MMSH or RTSP)\n");
560 err = AVERROR(EINVAL);
561 goto fail;
562 }
563 err = ff_mms_asf_header_parser(mms);
564 if (err) {
565 av_log(h, AV_LOG_TRACE, "asf header parsed failed!\n");
566 goto fail;
567 }
568 mms->header_parsed = 1;
569
570 if (!mms->asf_packet_len || !mms->stream_num)
571 goto fail;
572
573 clear_stream_buffers(mms);
574 err = mms_safe_send_recv(mmst, send_stream_selection_request, SC_PKT_STREAM_ID_ACCEPTED);
575 if (err)
576 goto fail;
577 // send media packet request
578 err = mms_safe_send_recv(mmst, send_media_packet_request, SC_PKT_MEDIA_PKT_FOLLOWS);
579 if (err) {
580 goto fail;
581 }
582 av_log(h, AV_LOG_TRACE, "Leaving open (success)\n");
583 return 0;
584 fail:
585 mms_close(h);
586 av_log(mms->mms_hd, AV_LOG_TRACE, "Leaving open (failure: %d)\n", err);
587 return err;
588 }
589
590 /** Read ASF data through the protocol. */
mms_read(URLContext * h,uint8_t * buf,int size)591 static int mms_read(URLContext *h, uint8_t *buf, int size)
592 {
593 /* TODO: see tcp.c:tcp_read() about a possible timeout scheme */
594 MMSTContext *mmst = h->priv_data;
595 MMSContext *mms = &mmst->mms;
596 int result = 0;
597
598 do {
599 if(mms->asf_header_read_size < mms->asf_header_size) {
600 /* Read from ASF header buffer */
601 result = ff_mms_read_header(mms, buf, size);
602 } else if(mms->remaining_in_len) {
603 /* Read remaining packet data to buffer.
604 * the result can not be zero because remaining_in_len is positive.*/
605 result = ff_mms_read_data(mms, buf, size);
606 } else {
607 /* Read from network */
608 int err = mms_safe_send_recv(mmst, NULL, SC_PKT_ASF_MEDIA);
609 if (err == 0) {
610 if(mms->remaining_in_len>mms->asf_packet_len) {
611 av_log(h, AV_LOG_ERROR,
612 "Incoming pktlen %d is larger than ASF pktsize %d\n",
613 mms->remaining_in_len, mms->asf_packet_len);
614 result= AVERROR(EIO);
615 } else {
616 // copy the data to the packet buffer.
617 result = ff_mms_read_data(mms, buf, size);
618 if (result == 0) {
619 av_log(h, AV_LOG_TRACE, "Read ASF media packet size is zero!\n");
620 break;
621 }
622 }
623 } else {
624 av_log(h, AV_LOG_TRACE, "read packet error!\n");
625 break;
626 }
627 }
628 } while(!result); // only return one packet.
629 return result;
630 }
631
632 const URLProtocol ff_mmst_protocol = {
633 .name = "mmst",
634 .url_open = mms_open,
635 .url_read = mms_read,
636 .url_close = mms_close,
637 .priv_data_size = sizeof(MMSTContext),
638 .flags = URL_PROTOCOL_FLAG_NETWORK,
639 };
640