History

MMS-over-TCP protocol support. Patch by Zhentan Feng <spyfeng gmail com>.

Originally committed as revision 23301 to svn://svn.ffmpeg.org/ffmpeg/trunk

Zhentan Feng committed 16 years ago

Commit a2403981 parent e34d5db6 files · +696 −2Browse files

Unified · Split

6 files
  1. Changelog +1 −0
  2. doc/general.texi +1 −0
  3. libavformat/Makefile +1 −0
  4. libavformat/allformats.c +1 −0
  5. libavformat/avformat.h +2 −2
  6. libavformat/mmst.c +690 −0
Changelog+1−0
@@ -6,6 +6,7 @@ version <next>: · 5 unmodified lines
6 6
7- WebM support in Matroska demuxer7- WebM support in Matroska demuxer
8- low overhead Ogg muxing8- low overhead Ogg muxing
9- MMS-TCP support
9 10
10 11
11 12
doc/general.texi+1−0
@@ -687,6 +687,7 @@ performance on systems without hardware floating point support). · 686 unmodified lines
687@item file @tab X687@item file @tab X
688@item Gopher @tab X688@item Gopher @tab X
689@item HTTP @tab X689@item HTTP @tab X
690@item MMS @tab X
690@item pipe @tab X691@item pipe @tab X
691@item RTP @tab X692@item RTP @tab X
692@item TCP @tab X693@item TCP @tab X
libavformat/Makefile+1−0
@@ -275,6 +275,7 @@ OBJS+= avio.o aviobuf.o · 274 unmodified lines
275OBJS-$(CONFIG_FILE_PROTOCOL) += file.o275OBJS-$(CONFIG_FILE_PROTOCOL) += file.o
276OBJS-$(CONFIG_GOPHER_PROTOCOL) += gopher.o276OBJS-$(CONFIG_GOPHER_PROTOCOL) += gopher.o
277OBJS-$(CONFIG_HTTP_PROTOCOL) += http.o httpauth.o277OBJS-$(CONFIG_HTTP_PROTOCOL) += http.o httpauth.o
278OBJS-$(CONFIG_MMST_PROTOCOL) += mmst.o asf.o
278OBJS-$(CONFIG_PIPE_PROTOCOL) += file.o279OBJS-$(CONFIG_PIPE_PROTOCOL) += file.o
279 280
280# external or internal rtmp281# external or internal rtmp
libavformat/allformats.c+1−0
@@ -219,6 +219,7 @@ void av_register_all(void) · 218 unmodified lines
219 REGISTER_PROTOCOL (FILE, file);219 REGISTER_PROTOCOL (FILE, file);
220 REGISTER_PROTOCOL (GOPHER, gopher);220 REGISTER_PROTOCOL (GOPHER, gopher);
221 REGISTER_PROTOCOL (HTTP, http);221 REGISTER_PROTOCOL (HTTP, http);
222 REGISTER_PROTOCOL (MMST, mmst);
222 REGISTER_PROTOCOL (PIPE, pipe);223 REGISTER_PROTOCOL (PIPE, pipe);
223 REGISTER_PROTOCOL (RTMP, rtmp);224 REGISTER_PROTOCOL (RTMP, rtmp);
224#if CONFIG_LIBRTMP225#if CONFIG_LIBRTMP
libavformat/avformat.h+2−2
@@ -22,8 +22,8 @@ · 21 unmodified lines
22#define AVFORMAT_AVFORMAT_H22#define AVFORMAT_AVFORMAT_H
23 23
24#define LIBAVFORMAT_VERSION_MAJOR 5224#define LIBAVFORMAT_VERSION_MAJOR 52
25#define LIBAVFORMAT_VERSION_MINOR 6425#define LIBAVFORMAT_VERSION_MINOR 65
26#define LIBAVFORMAT_VERSION_MICRO 126#define LIBAVFORMAT_VERSION_MICRO 0
27 27
28#define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \28#define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
29 LIBAVFORMAT_VERSION_MINOR, \29 LIBAVFORMAT_VERSION_MINOR, \
libavformat/mmst.c+690−0
@@ -0,0 +1,690 @@
1/*
2 * MMS protocol over TCP
3 * Copyright (c) 2006,2007 Ryan Martell
4 * Copyright (c) 2007 Bj�rn 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#include "avformat.h"
24#include "internal.h"
25#include "libavutil/intreadwrite.h"
26#include "libavcodec/bytestream.h"
27#include "network.h"
28#include "asf.h"
29
30#define LOCAL_ADDRESS 0xc0a80081 // FIXME get and use correct local ip address.
31#define LOCAL_PORT 1037 // as above.
32/** Client to server packet types. */
33typedef enum {
34 CS_PKT_INITIAL = 0x01,
35 CS_PKT_PROTOCOL_SELECT = 0x02,
36 CS_PKT_MEDIA_FILE_REQUEST = 0x05,
37 CS_PKT_START_FROM_PKT_ID = 0x07,
38 CS_PKT_STREAM_PAUSE = 0x09,
39 CS_PKT_STREAM_CLOSE = 0x0d,
40 CS_PKT_MEDIA_HEADER_REQUEST = 0x15,
41 CS_PKT_TIMING_DATA_REQUEST = 0x18,
42 CS_PKT_USER_PASSWORD = 0x1a,
43 CS_PKT_KEEPALIVE = 0x1b,
44 CS_PKT_STREAM_ID_REQUEST = 0x33,
45} MMSCSPacketType;
46
47/** Server to client packet types. */
48typedef enum {
49 /** Control packets. */
50 /*@{*/
51 SC_PKT_CLIENT_ACCEPTED = 0x01,
52 SC_PKT_PROTOCOL_ACCEPTED = 0x02,
53 SC_PKT_PROTOCOL_FAILED = 0x03,
54 SC_PKT_MEDIA_PKT_FOLLOWS = 0x05,
55 SC_PKT_MEDIA_FILE_DETAILS = 0x06,
56 SC_PKT_HEADER_REQUEST_ACCEPTED = 0x11,
57 SC_PKT_TIMING_TEST_REPLY = 0x15,
58 SC_PKT_PASSWORD_REQUIRED = 0x1a,
59 SC_PKT_KEEPALIVE = 0x1b,
60 SC_PKT_STREAM_STOPPED = 0x1e,
61 SC_PKT_STREAM_CHANGING = 0x20,
62 SC_PKT_STREAM_ID_ACCEPTED = 0x21,
63 /*@}*/
64
65 /** Pseudo packets. */
66 /*@{*/
67 SC_PKT_CANCEL = -1,
68 SC_PKT_NO_DATA = -2,
69 /*@}*/
70
71 /** Data packets. */
72 /*@{*/
73 SC_PKT_ASF_HEADER = 0x010000,// make it bigger than 0xFF in case of
74 SC_PKT_ASF_MEDIA = 0x010001,// receiving false data packets.
75 /*@}*/
76} MMSSCPacketType;
77
78typedef struct {
79 int id;
80}MMSStream;
81
82typedef struct {
83 int outgoing_packet_seq; ///< Outgoing packet sequence number.
84 char path[256]; ///< Path of the resource being asked for.
85 char host[128]; ///< Host of the resources.
86
87 URLContext *mms_hd; ///< TCP connection handle
88 MMSStream streams[MAX_STREAMS];
89
90 /** Buffer for outgoing packets. */
91 /*@{*/
92 uint8_t *write_out_ptr; ///< Pointer for writting the buffer.
93 uint8_t out_buffer[512]; ///< Buffer for outgoing packet.
94 /*@}*/
95
96 /** Buffer for incoming packets. */
97 /*@{*/
98 uint8_t in_buffer[8192]; ///< Buffer for incoming packets.
99 uint8_t *read_in_ptr; ///< Pointer for reading from incoming buffer.
100 int remaining_in_len; ///< Reading length from incoming buffer.
101 /*@}*/
102
103 int incoming_packet_seq; ///< Incoming packet sequence number.
104 int incoming_flags; ///< Incoming packet flags.
105
106 int packet_id; ///< Identifier for packets in the current stream.
107 unsigned int header_packet_id; ///< default is 2.
108
109 /** Internal handling of the ASF header */
110 /*@{*/
111 uint8_t *asf_header; ///< Stored ASF header.
112 int asf_header_size; ///< Size of stored ASF header.
113 int header_parsed; ///< The header has been received and parsed.
114 int asf_packet_len;
115 /*@}*/
116
117 int stream_num; ///< stream numbers.
118 int is_playing;
119} MMSContext;
120
121/** Create MMST command packet header */
122static void start_command_packet(MMSContext *mms, MMSCSPacketType packet_type)
123{
124 mms->write_out_ptr = mms->out_buffer;
125
126 bytestream_put_le32(&mms->write_out_ptr, 1); // start sequence
127 bytestream_put_le32(&mms->write_out_ptr, 0xb00bface);
128 bytestream_put_le32(&mms->write_out_ptr, 0); // Length starts from after the protocol type bytes
129 bytestream_put_le32(&mms->write_out_ptr, MKTAG('M','M','S',' '));
130 bytestream_put_le32(&mms->write_out_ptr, 0);
131 bytestream_put_le32(&mms->write_out_ptr, mms->outgoing_packet_seq++);
132 bytestream_put_le64(&mms->write_out_ptr, 0); // timestamp
133 bytestream_put_le32(&mms->write_out_ptr, 0);
134 bytestream_put_le16(&mms->write_out_ptr, packet_type);
135 bytestream_put_le16(&mms->write_out_ptr, 3); // direction to server
136}
137
138/** Add prefixes to MMST command packet. */
139static void insert_command_prefixes(MMSContext *mms,
140 uint32_t prefix1, uint32_t prefix2)
141{
142 bytestream_put_le32(&mms->write_out_ptr, prefix1); // first prefix
143 bytestream_put_le32(&mms->write_out_ptr, prefix2); // second prefix
144}
145
146/** Send a prepared MMST command packet. */
147static int send_command_packet(MMSContext *mms)
148{
149 int exact_length= mms->write_out_ptr - mms->out_buffer;
150 int first_length= exact_length - 16;
151 int len8= first_length/8;
152 int write_result;
153
154 // update packet length fields.
155 AV_WL32(mms->out_buffer + 8, first_length);
156 AV_WL32(mms->out_buffer + 16, len8);
157 AV_WL32(mms->out_buffer + 32, len8-2);
158
159 // write it out.
160 write_result= url_write(mms->mms_hd, mms->out_buffer, exact_length);
161 if(write_result != exact_length) {
162 dprintf(NULL, "url_write returned: %d != %d\n",
163 write_result, exact_length);
164 return AVERROR_IO;
165 }
166
167 return 0;
168}
169
170static void mms_put_utf16(MMSContext *mms, uint8_t *src)
171{
172 ByteIOContext bic;
173 int size = mms->write_out_ptr - mms->out_buffer;
174 int len;
175 init_put_byte(&bic, mms->write_out_ptr,
176 sizeof(mms->out_buffer) - size, 1, NULL, NULL, NULL, NULL);
177
178 len = ff_put_str16_nolen(&bic, src);
179 mms->write_out_ptr += len;
180}
181
182static int send_protocol_select(MMSContext *mms)
183{
184 char data_string[256];
185
186 start_command_packet(mms, CS_PKT_PROTOCOL_SELECT);
187 insert_command_prefixes(mms, 0, 0xffffffff);
188 bytestream_put_le32(&mms->write_out_ptr, 0); // maxFunnelBytes
189 bytestream_put_le32(&mms->write_out_ptr, 0x00989680); // maxbitRate
190 bytestream_put_le32(&mms->write_out_ptr, 2); // funnelMode
191 snprintf(data_string, sizeof(data_string), "\\\\%d.%d.%d.%d\\%s\\%d",
192 (LOCAL_ADDRESS>>24)&0xff,
193 (LOCAL_ADDRESS>>16)&0xff,
194 (LOCAL_ADDRESS>>8)&0xff,
195 LOCAL_ADDRESS&0xff,
196 "TCP", // or UDP
197 LOCAL_PORT);
198
199 mms_put_utf16(mms, data_string);
200 return send_command_packet(mms);
201}
202
203static int send_media_file_request(MMSContext *mms)
204{
205 start_command_packet(mms, 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 mms_put_utf16(mms, mms->path + 1); // +1 for skip "/"
210
211 return send_command_packet(mms);
212}
213
214static void handle_packet_stream_changing_type(MMSContext *mms)
215{
216 dprintf(NULL, "Stream changing!\n");
217
218 // 40 is the packet header size, 7 is the prefix size.
219 mms->header_packet_id= AV_RL32(mms->in_buffer + 40 + 7);
220 dprintf(NULL, "Changed header prefix to 0x%x", mms->header_packet_id);
221}
222
223static int send_keepalive_packet(MMSContext *mms)
224{
225 // respond to a keepalive with a keepalive...
226 start_command_packet(mms, CS_PKT_KEEPALIVE);
227 insert_command_prefixes(mms, 1, 0x100FFFF);
228 return send_command_packet(mms);
229}
230
231/** Pad media packets smaller than max_packet_size and/or adjust read position
232 * after a seek. */
233static void pad_media_packet(MMSContext *mms)
234{
235 if(mms->remaining_in_len<mms->asf_packet_len) {
236 int padding_size = mms->asf_packet_len - mms->remaining_in_len;
237 memset(mms->in_buffer + mms->remaining_in_len, 0, padding_size);
238 mms->remaining_in_len += padding_size;
239 }
240}
241
242/** Read incoming MMST media, header or command packet. */
243static MMSSCPacketType get_tcp_server_response(MMSContext *mms)
244{
245 int read_result;
246 MMSSCPacketType packet_type= -1;
247
248 for(;;) {
249 if((read_result= url_read_complete(mms->mms_hd, mms->in_buffer, 8))==8) {
250 // handle command packet.
251 if(AV_RL32(mms->in_buffer + 4)==0xb00bface) {
252 mms->incoming_flags= mms->in_buffer[3];
253 read_result= url_read_complete(mms->mms_hd, mms->in_buffer+8, 4);
254 if(read_result == 4) {
255 int length_remaining= AV_RL32(mms->in_buffer+8) + 4;
256
257 dprintf(NULL, "Length remaining is %d\n", length_remaining);
258 // read the rest of the packet.
259 if (length_remaining < 0
260 || length_remaining > sizeof(mms->in_buffer) - 12) {
261 dprintf("Incoming message len %d exceeds buffer len %d\n",
262 length_remaining, sizeof(mms->in_buffer) - 12);
263 return -1;
264 }
265 read_result = url_read_complete(mms->mms_hd, mms->in_buffer + 12,
266 length_remaining) ;
267 if (read_result == length_remaining) {
268 packet_type= AV_RL16(mms->in_buffer+36);
269 } else {
270 dprintf(NULL, "read for packet type failed%d!\n", read_result);
271 return -1;
272 }
273 } else {
274 dprintf(NULL, "read for length remaining failed%d!\n", read_result);
275 return -1;
276 }
277 } else {
278 int length_remaining;
279 int packet_id_type;
280 int tmp;
281
282 assert(mms->remaining_in_len==0);
283
284 // note we cache the first 8 bytes,
285 // then fill up the buffer with the others
286 tmp = AV_RL16(mms->in_buffer + 6);
287 length_remaining = (tmp - 8) & 0xffff;
288 mms->incoming_packet_seq = AV_RL32(mms->in_buffer);
289 packet_id_type = mms->in_buffer[4];
290 mms->incoming_flags = mms->in_buffer[5];
291
292 if (length_remaining < 0
293 || length_remaining > sizeof(mms->in_buffer) - 8) {
294 dprintf("Incoming data len %d exceeds buffer len %d\n",
295 length_remaining, sizeof(mms->in_buffer));
296 return -1;
297 }
298 mms->remaining_in_len = length_remaining;
299 mms->read_in_ptr = mms->in_buffer;
300 read_result= url_read_complete(mms->mms_hd, mms->in_buffer, length_remaining);
301 if(read_result != length_remaining) {
302 dprintf(NULL, "read_bytes result: %d asking for %d\n",
303 read_result, length_remaining);
304 return -1;
305 } else {
306 // if we successfully read everything.
307 if(packet_id_type == mms->header_packet_id) {
308 packet_type = SC_PKT_ASF_HEADER;
309 // Store the asf header
310 if(!mms->header_parsed) {
311 void *p = av_realloc(mms->asf_header,
312 mms->asf_header_size
313 + mms->remaining_in_len);
314 if (!p) {
315 av_freep(&mms->asf_header);
316 return AVERROR(ENOMEM);
317 }
318 mms->asf_header = p;
319 memcpy(mms->asf_header + mms->asf_header_size,
320 mms->read_in_ptr,
321 mms->remaining_in_len);
322 mms->asf_header_size += mms->remaining_in_len;
323 }
324 } else if(packet_id_type == mms->packet_id) {
325 packet_type = SC_PKT_ASF_MEDIA;
326 } else {
327 dprintf(NULL, "packet id type %d is old.", packet_id_type);
328 continue;
329 }
330 }
331 }
332
333 // preprocess some packet type
334 if(packet_type == SC_PKT_KEEPALIVE) {
335 send_keepalive_packet(mms);
336 continue;
337 } else if(packet_type == SC_PKT_STREAM_CHANGING) {
338 handle_packet_stream_changing_type(mms);
339 } else if(packet_type == SC_PKT_ASF_MEDIA) {
340 pad_media_packet(mms);
341 }
342 return packet_type;
343 } else {
344 if(read_result<0) {
345 dprintf(NULL, "Read error (or cancelled) returned %d!\n", read_result);
346 packet_type = SC_PKT_CANCEL;
347 } else {
348 dprintf(NULL, "Read result of zero?!\n");
349 packet_type = SC_PKT_NO_DATA;
350 }
351 return packet_type;
352 }
353 }
354}
355
356static int mms_safe_send_recv(MMSContext *mms,
357 int (*send_fun)(MMSContext *mms),
358 const MMSSCPacketType expect_type)
359{
360 MMSSCPacketType type;
361 if(send_fun) {
362 int ret = send_fun(mms);
363 if (ret < 0) {
364 dprintf(NULL, "Send Packet error before expecting recv packet %d\n", expect_type);
365 return ret;
366 }
367 }
368
369 if ((type = get_tcp_server_response(mms)) != expect_type) {
370 dprintf(NULL,"Unexpected packet type %d with type %d\n", type, expect_type);
371 return -1;
372 } else {
373 return 0;
374 }
375}
376
377static int send_media_header_request(MMSContext *mms)
378{
379 start_command_packet(mms, CS_PKT_MEDIA_HEADER_REQUEST);
380 insert_command_prefixes(mms, 1, 0);
381 bytestream_put_le32(&mms->write_out_ptr, 0);
382 bytestream_put_le32(&mms->write_out_ptr, 0x00800000);
383 bytestream_put_le32(&mms->write_out_ptr, 0xffffffff);
384 bytestream_put_le32(&mms->write_out_ptr, 0);
385 bytestream_put_le32(&mms->write_out_ptr, 0);
386 bytestream_put_le32(&mms->write_out_ptr, 0);
387
388 // the media preroll value in milliseconds?
389 bytestream_put_le32(&mms->write_out_ptr, 0);
390 bytestream_put_le32(&mms->write_out_ptr, 0x40AC2000);
391 bytestream_put_le32(&mms->write_out_ptr, 2);
392 bytestream_put_le32(&mms->write_out_ptr, 0);
393
394 return send_command_packet(mms);
395}
396
397/** Send the initial handshake. */
398static int send_startup_packet(MMSContext *mms)
399{
400 char data_string[256];
401 // SubscriberName is defined in MS specification linked below.
402 // The guid value can be any valid value.
403 // http://download.microsoft.com/
404 // download/9/5/E/95EF66AF-9026-4BB0-A41D-A4F81802D92C/%5BMS-WMSP%5D.pdf
405 snprintf(data_string, sizeof(data_string),
406 "NSPlayer/7.0.0.1956; {%s}; Host: %s",
407 "7E667F5D-A661-495E-A512-F55686DDA178", mms->host);
408
409 start_command_packet(mms, CS_PKT_INITIAL);
410 insert_command_prefixes(mms, 0, 0x0004000b);
411 bytestream_put_le32(&mms->write_out_ptr, 0x0003001c);
412 mms_put_utf16(mms, data_string);
413 return send_command_packet(mms);
414}
415
416static int asf_header_parser(MMSContext *mms)
417{
418 uint8_t *p = mms->asf_header;
419 uint8_t *end;
420 int flags, stream_id, real_header_size;
421 mms->stream_num = 0;
422
423 if (mms->asf_header_size < sizeof(ff_asf_guid) * 2 + 22 ||
424 memcmp(p, ff_asf_header, sizeof(ff_asf_guid)))
425 return -1;
426
427 real_header_size = AV_RL64(p + sizeof(ff_asf_guid));
428 end = mms->asf_header + real_header_size;
429
430 p += sizeof(ff_asf_guid) + 14;
431 while(end - p >= sizeof(ff_asf_guid) + 8) {
432 uint64_t chunksize = AV_RL64(p + sizeof(ff_asf_guid));
433 if (!chunksize || chunksize > end - p) {
434 dprintf("chunksize is exceptional value:%d!\n", chunksize);
435 return -1;
436 }
437 if (!memcmp(p, ff_asf_file_header, sizeof(ff_asf_guid))) {
438 /* read packet size */
439 if (end - p > sizeof(ff_asf_guid) * 2 + 68) {
440 mms->asf_packet_len = AV_RL32(p + sizeof(ff_asf_guid) * 2 + 64);
441 if (mms->asf_packet_len <= 0 || mms->asf_packet_len > sizeof(mms->in_buffer)) {
442 dprintf(NULL,"Too large packet len:%d"
443 " may overwrite in_buffer when padding", mms->asf_packet_len);
444 return -1;
445 }
446 }
447 } else if (!memcmp(p, ff_asf_stream_header, sizeof(ff_asf_guid))) {
448 flags = AV_RL16(p + sizeof(ff_asf_guid)*3 + 24);
449 stream_id = flags & 0x7F;
450 //The second condition is for checking CS_PKT_STREAM_ID_REQUEST packet size,
451 //we can calcuate the packet size by stream_num.
452 //Please see function send_stream_selection_request().
453 if (mms->stream_num < MAX_STREAMS &&
454 46 + mms->stream_num * 6 < sizeof(mms->out_buffer)) {
455 mms->streams[mms->stream_num].id = stream_id;
456 mms->stream_num++;
457 } else {
458 dprintf("Too many streams.\n");
459 return -1;
460 }
461 }
462 p += chunksize;
463 }
464
465 return 0;
466}
467
468/** Send MMST stream selection command based on the AVStream->discard values. */
469static int send_stream_selection_request(MMSContext *mms)
470{
471 int i;
472
473 // send the streams we want back...
474 start_command_packet(mms, CS_PKT_STREAM_ID_REQUEST);
475 bytestream_put_le32(&mms->write_out_ptr, mms->stream_num); // stream nums
476 for(i= 0; i<mms->stream_num; i++) {
477 bytestream_put_le16(&mms->write_out_ptr, 0xffff); // flags
478 bytestream_put_le16(&mms->write_out_ptr, mms->streams[i].id); // stream id
479 bytestream_put_le16(&mms->write_out_ptr, 0); // selection
480 }
481
482 bytestream_put_le16(&mms->write_out_ptr, 0);
483
484 return send_command_packet(mms);
485}
486
487static int read_data(MMSContext *mms, uint8_t *buf, const int buf_size)
488{
489 int read_size;
490 read_size = FFMIN(buf_size, mms->remaining_in_len);
491 memcpy(buf, mms->read_in_ptr, read_size);
492 mms->remaining_in_len -= read_size;
493 mms->read_in_ptr += read_size;
494 return read_size;
495}
496
497/** Read at most one media packet (or a whole header). */
498static int read_mms_packet(MMSContext *mms, uint8_t *buf, int buf_size)
499{
500 int result = 0, read_header_size = 0;
501 int size_to_copy;
502
503 do {
504 if(read_header_size < mms->asf_header_size && !mms->is_playing) {
505 /* Read from ASF header buffer */
506 size_to_copy= FFMIN(buf_size,
507 mms->asf_header_size - read_header_size);
508 memcpy(buf, mms->asf_header + read_header_size, size_to_copy);
509 read_header_size += size_to_copy;
510 result += size_to_copy;
511 dprintf(NULL, "Copied %d bytes from stored header. left: %d\n",
512 size_to_copy, mms->asf_header_size - read_header_size);
513 if (mms->asf_header_size == read_header_size) {
514 av_freep(&mms->asf_header);
515 mms->is_playing = 1;
516 }
517 } else if(mms->remaining_in_len) {
518 /* Read remaining packet data to buffer.
519 * the result can not be zero because remaining_in_len is positive.*/
520 result = read_data(mms, buf, buf_size);
521 } else {
522 /* Read from network */
523 int err = mms_safe_send_recv(mms, NULL, SC_PKT_ASF_MEDIA);
524 if (err == 0) {
525 if(mms->remaining_in_len>mms->asf_packet_len) {
526 dprintf(NULL, "Incoming packet"
527 "larger than the asf packet size stated (%d>%d)\n",
528 mms->remaining_in_len, mms->asf_packet_len);
529 result= AVERROR_IO;
530 } else {
531 // copy the data to the packet buffer.
532 result = read_data(mms, buf, buf_size);
533 if (result == 0) {
534 dprintf(NULL, "read asf media paket size is zero!\n");
535 break;
536 }
537 }
538 } else {
539 dprintf(NULL, "read packet error!\n");
540 break;
541 }
542 }
543 } while(!result); // only return one packet.
544 return result;
545}
546
547static int send_close_packet(MMSContext *mms)
548{
549 start_command_packet(mms, CS_PKT_STREAM_CLOSE);
550 insert_command_prefixes(mms, 1, 1);
551
552 return send_command_packet(mms);
553}
554
555/** Close the MMSH/MMST connection */
556static int mms_close(URLContext *h)
557{
558 MMSContext *mms = (MMSContext *)h->priv_data;
559
560 if(mms->mms_hd) {
561 send_close_packet(mms);
562 url_close(mms->mms_hd);
563 }
564
565 /* free all separately allocated pointers in mms */
566 av_free(mms->asf_header);
567 av_freep(&h->priv_data);
568
569 return 0;
570}
571
572static int mms_open(URLContext *h, const char *uri, int flags)
573{
574 MMSContext *mms;
575 int port, err;
576 char tcpname[256];
577
578 h->is_streamed = 1;
579 mms = h->priv_data = av_mallocz(sizeof(MMSContext));
580 if (!h->priv_data)
581 return AVERROR(ENOMEM);
582
583 // only for MMS over TCP, so set proto = NULL
584 ff_url_split(NULL, 0, NULL, 0,
585 mms->host, sizeof(mms->host), &port, mms->path,
586 sizeof(mms->path), uri);
587
588 if(port<0)
589 port = 1755; // defaut mms protocol port
590
591 // establish tcp connection.
592 ff_url_join(tcpname, sizeof(tcpname), "tcp", NULL, mms->host, port, NULL);
593 err = url_open(&mms->mms_hd, tcpname, URL_RDWR);
594 if (err)
595 goto fail;
596
597 mms->packet_id = 3; // default, initial value.
598 mms->header_packet_id = 2; // default, initial value.
599 err = mms_safe_send_recv(mms, send_startup_packet, SC_PKT_CLIENT_ACCEPTED);
600 if (err)
601 goto fail;
602 err = mms_safe_send_recv(mms, send_protocol_select, SC_PKT_PROTOCOL_ACCEPTED);
603 if (err)
604 goto fail;
605 err = mms_safe_send_recv(mms, send_media_file_request, SC_PKT_MEDIA_FILE_DETAILS);
606 if (err)
607 goto fail;
608 err = mms_safe_send_recv(mms, send_media_header_request, SC_PKT_HEADER_REQUEST_ACCEPTED);
609 if (err)
610 goto fail;
611 err = mms_safe_send_recv(mms, NULL, SC_PKT_ASF_HEADER);
612 if (err)
613 goto fail;
614 if((mms->incoming_flags != 0X08) && (mms->incoming_flags != 0X0C))
615 goto fail;
616 err = asf_header_parser(mms);
617 if (err) {
618 dprintf(NULL, "asf header parsed failed!\n");
619 goto fail;
620 }
621 mms->header_parsed = 1;
622
623 if (!mms->asf_packet_len || !mms->stream_num)
624 goto fail;
625
626 dprintf(NULL, "Leaving open (success)\n");
627 return 0;
628fail:
629 mms_close(h);
630 dprintf(NULL, "Leaving open (failure: %d)\n", err);
631 return err;
632}
633
634static int send_media_packet_request(MMSContext *mms)
635{
636 start_command_packet(mms, CS_PKT_START_FROM_PKT_ID);
637 insert_command_prefixes(mms, 1, 0x0001FFFF);
638 bytestream_put_le64(&mms->write_out_ptr, 0); // seek timestamp
639 bytestream_put_le32(&mms->write_out_ptr, 0xffffffff); // unknown
640 bytestream_put_le32(&mms->write_out_ptr, 0xffffffff); // packet offset
641 bytestream_put_byte(&mms->write_out_ptr, 0xff); // max stream time limit
642 bytestream_put_byte(&mms->write_out_ptr, 0xff); // max stream time limit
643 bytestream_put_byte(&mms->write_out_ptr, 0xff); // max stream time limit
644 bytestream_put_byte(&mms->write_out_ptr, 0x00); // stream time limit flag
645
646 mms->packet_id++; // new packet_id
647 bytestream_put_le32(&mms->write_out_ptr, mms->packet_id);
648 return send_command_packet(mms);
649}
650
651
652static void clear_stream_buffers(MMSContext *mms)
653{
654 mms->remaining_in_len = 0;
655 mms->read_in_ptr = mms->in_buffer;
656}
657
658/** Read ASF data through the protocol. */
659static int mms_read(URLContext *h, uint8_t *buf, int size)
660{
661 /* TODO: see tcp.c:tcp_read() about a possible timeout scheme */
662 MMSContext *mms = h->priv_data;
663 int result = 0;
664
665 /* Since we read the header at open(), this shouldn't be possible */
666 assert(mms->header_parsed);
667
668 if (!mms->is_playing) {
669 dprintf(NULL, "mms_read() before play().\n");
670 clear_stream_buffers(mms);
671 result = mms_safe_send_recv(mms, send_stream_selection_request, SC_PKT_STREAM_ID_ACCEPTED);
672 if (result)
673 return result;
674 // send media packet request
675 result = mms_safe_send_recv(mms, send_media_packet_request, SC_PKT_MEDIA_PKT_FOLLOWS);
676 if (result) {
677 return result;
678 }
679 }
680 return read_mms_packet(mms, buf, size);
681}
682
683URLProtocol mmst_protocol = {
684 "mmst",
685 mms_open,
686 mms_read,
687 NULL, // write
688 NULL, // seek
689 mms_close,
690};

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