Statistics
| Branch: | Revision:

ffmpeg / libavformat / mmst.c @ e6e7ba0c

History | View | Annotate | Download (23.1 KB)

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

    
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 {
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 */
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. */
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. */
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(NULL, AV_LOG_ERROR,
145
               "Failed to write data of length %d: %d (%s)\n",
146
               exact_length, write_result,
147
               write_result < 0 ? strerror(write_result) :
148
                   "The server closed the connection");
149
        return AVERROR(EIO);
150
    }
151

    
152
    return 0;
153
}
154

    
155
static void 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
    mms->write_out_ptr += len;
165
}
166

    
167
static int send_time_test_data(MMSTContext *mmst)
168
{
169
    start_command_packet(mmst, CS_PKT_TIMING_DATA_REQUEST);
170
    insert_command_prefixes(&mmst->mms, 0x00f0f0f0, 0x0004000b);
171
    return send_command_packet(mmst);
172
}
173

    
174
static int send_protocol_select(MMSTContext *mmst)
175
{
176
    char data_string[256];
177
    MMSContext *mms = &mmst->mms;
178

    
179
    start_command_packet(mmst, CS_PKT_PROTOCOL_SELECT);
180
    insert_command_prefixes(mms, 0, 0xffffffff);
181
    bytestream_put_le32(&mms->write_out_ptr, 0);          // maxFunnelBytes
182
    bytestream_put_le32(&mms->write_out_ptr, 0x00989680); // maxbitRate
183
    bytestream_put_le32(&mms->write_out_ptr, 2);          // funnelMode
184
    snprintf(data_string, sizeof(data_string), "\\\\%d.%d.%d.%d\\%s\\%d",
185
            (LOCAL_ADDRESS>>24)&0xff,
186
            (LOCAL_ADDRESS>>16)&0xff,
187
            (LOCAL_ADDRESS>>8)&0xff,
188
            LOCAL_ADDRESS&0xff,
189
            "TCP",                                        // or UDP
190
            LOCAL_PORT);
191

    
192
    mms_put_utf16(mms, data_string);
193
    return send_command_packet(mmst);
194
}
195

    
196
static int send_media_file_request(MMSTContext *mmst)
197
{
198
    MMSContext *mms = &mmst->mms;
199
    start_command_packet(mmst, CS_PKT_MEDIA_FILE_REQUEST);
200
    insert_command_prefixes(mms, 1, 0xffffffff);
201
    bytestream_put_le32(&mms->write_out_ptr, 0);
202
    bytestream_put_le32(&mms->write_out_ptr, 0);
203
    mms_put_utf16(mms, mmst->path + 1); // +1 for skip "/"
204

    
205
    return send_command_packet(mmst);
206
}
207

    
208
static void handle_packet_stream_changing_type(MMSTContext *mmst)
209
{
210
    MMSContext *mms = &mmst->mms;
211
    av_dlog(NULL, "Stream changing!\n");
212

    
213
    // 40 is the packet header size, 7 is the prefix size.
214
    mmst->header_packet_id= AV_RL32(mms->in_buffer + 40 + 7);
215
    av_dlog(NULL, "Changed header prefix to 0x%x", mmst->header_packet_id);
216
}
217

    
218
static int send_keepalive_packet(MMSTContext *mmst)
219
{
220
    // respond to a keepalive with a keepalive...
221
    start_command_packet(mmst, CS_PKT_KEEPALIVE);
222
    insert_command_prefixes(&mmst->mms, 1, 0x100FFFF);
223
    return send_command_packet(mmst);
224
}
225

    
226
/** Pad media packets smaller than max_packet_size and/or adjust read position
227
  * after a seek. */
228
static void pad_media_packet(MMSContext *mms)
229
{
230
    if(mms->remaining_in_len<mms->asf_packet_len) {
231
        int padding_size = mms->asf_packet_len - mms->remaining_in_len;
232
        memset(mms->in_buffer + mms->remaining_in_len, 0, padding_size);
233
        mms->remaining_in_len += padding_size;
234
    }
235
}
236

    
237
/** Read incoming MMST media, header or command packet. */
238
static MMSSCPacketType get_tcp_server_response(MMSTContext *mmst)
239
{
240
    int read_result;
241
    MMSSCPacketType packet_type= -1;
242
    MMSContext *mms = &mmst->mms;
243
    for(;;) {
244
        read_result = ffurl_read_complete(mms->mms_hd, mms->in_buffer, 8);
245
        if (read_result != 8) {
246
            if(read_result < 0) {
247
                av_log(NULL, AV_LOG_ERROR,
248
                       "Error reading packet header: %d (%s)\n",
249
                       read_result, strerror(read_result));
250
                packet_type = SC_PKT_CANCEL;
251
            } else {
252
                av_log(NULL, AV_LOG_ERROR,
253
                       "The server closed the connection\n");
254
                packet_type = SC_PKT_NO_DATA;
255
            }
256
            return packet_type;
257
        }
258

    
259
        // handle command packet.
260
        if(AV_RL32(mms->in_buffer + 4)==0xb00bface) {
261
            int length_remaining, hr;
262

    
263
            mmst->incoming_flags= mms->in_buffer[3];
264
            read_result= ffurl_read_complete(mms->mms_hd, mms->in_buffer+8, 4);
265
            if(read_result != 4) {
266
                av_log(NULL, AV_LOG_ERROR,
267
                       "Reading command packet length failed: %d (%s)\n",
268
                       read_result,
269
                       read_result < 0 ? strerror(read_result) :
270
                           "The server closed the connection");
271
                return read_result < 0 ? read_result : AVERROR(EIO);
272
            }
273

    
274
            length_remaining= AV_RL32(mms->in_buffer+8) + 4;
275
            av_dlog(NULL, "Length remaining is %d\n", length_remaining);
276
            // read the rest of the packet.
277
            if (length_remaining < 0
278
                || length_remaining > sizeof(mms->in_buffer) - 12) {
279
                av_log(NULL, AV_LOG_ERROR,
280
                       "Incoming packet length %d exceeds bufsize %zu\n",
281
                       length_remaining, sizeof(mms->in_buffer) - 12);
282
                return AVERROR_INVALIDDATA;
283
            }
284
            read_result = ffurl_read_complete(mms->mms_hd, mms->in_buffer + 12,
285
                                            length_remaining) ;
286
            if (read_result != length_remaining) {
287
                av_log(NULL, AV_LOG_ERROR,
288
                       "Reading pkt data (length=%d) failed: %d (%s)\n",
289
                       length_remaining, read_result,
290
                       read_result < 0 ? strerror(read_result) :
291
                           "The server closed the connection");
292
                return read_result < 0 ? read_result : AVERROR(EIO);
293
            }
294
            packet_type= AV_RL16(mms->in_buffer+36);
295
            if (read_result >= 44 && (hr = AV_RL32(mms->in_buffer + 40))) {
296
                av_log(NULL, AV_LOG_ERROR,
297
                       "Server sent a message with packet type 0x%x and error status code 0x%08x\n", packet_type, hr);
298
                return AVERROR(EINVAL);
299
            }
300
        } else {
301
            int length_remaining;
302
            int packet_id_type;
303
            int tmp;
304

    
305
            // note we cache the first 8 bytes,
306
            // then fill up the buffer with the others
307
            tmp                       = AV_RL16(mms->in_buffer + 6);
308
            length_remaining          = (tmp - 8) & 0xffff;
309
            mmst->incoming_packet_seq = AV_RL32(mms->in_buffer);
310
            packet_id_type            = mms->in_buffer[4];
311
            mmst->incoming_flags      = mms->in_buffer[5];
312

    
313
            if (length_remaining < 0
314
                || length_remaining > sizeof(mms->in_buffer) - 8) {
315
                av_log(NULL, AV_LOG_ERROR,
316
                       "Data length %d is invalid or too large (max=%zu)\n",
317
                       length_remaining, sizeof(mms->in_buffer));
318
                return AVERROR_INVALIDDATA;
319
            }
320
            mms->remaining_in_len    = length_remaining;
321
            mms->read_in_ptr         = mms->in_buffer;
322
            read_result= ffurl_read_complete(mms->mms_hd, mms->in_buffer, length_remaining);
323
            if(read_result != length_remaining) {
324
                av_log(NULL, AV_LOG_ERROR,
325
                       "Failed to read packet data of size %d: %d (%s)\n",
326
                       length_remaining, read_result,
327
                       read_result < 0 ? strerror(read_result) :
328
                           "The server closed the connection");
329
                return read_result < 0 ? read_result : AVERROR(EIO);
330
            }
331

    
332
            // if we successfully read everything.
333
            if(packet_id_type == mmst->header_packet_id) {
334
                packet_type = SC_PKT_ASF_HEADER;
335
                // Store the asf header
336
                if(!mms->header_parsed) {
337
                    void *p = av_realloc(mms->asf_header,
338
                                  mms->asf_header_size + mms->remaining_in_len);
339
                    if (!p) {
340
                        av_freep(&mms->asf_header);
341
                        return AVERROR(ENOMEM);
342
                    }
343
                    mms->asf_header = p;
344
                    memcpy(mms->asf_header + mms->asf_header_size,
345
                           mms->read_in_ptr, mms->remaining_in_len);
346
                    mms->asf_header_size += mms->remaining_in_len;
347
                }
348
                // 0x04 means asf header is sent in multiple packets.
349
                if (mmst->incoming_flags == 0x04)
350
                    continue;
351
            } else if(packet_id_type == mmst->packet_id) {
352
                packet_type = SC_PKT_ASF_MEDIA;
353
            } else {
354
                av_dlog(NULL, "packet id type %d is old.", packet_id_type);
355
                continue;
356
            }
357
        }
358

    
359
        // preprocess some packet type
360
        if(packet_type == SC_PKT_KEEPALIVE) {
361
            send_keepalive_packet(mmst);
362
            continue;
363
        } else if(packet_type == SC_PKT_STREAM_CHANGING) {
364
            handle_packet_stream_changing_type(mmst);
365
        } else if(packet_type == SC_PKT_ASF_MEDIA) {
366
            pad_media_packet(mms);
367
        }
368
        return packet_type;
369
    }
370
}
371

    
372
static int mms_safe_send_recv(MMSTContext *mmst,
373
                              int (*send_fun)(MMSTContext *mmst),
374
                              const MMSSCPacketType expect_type)
375
{
376
    MMSSCPacketType type;
377
    if(send_fun) {
378
        int ret = send_fun(mmst);
379
        if (ret < 0) {
380
            av_dlog(NULL, "Send Packet error before expecting recv packet %d\n", expect_type);
381
            return ret;
382
        }
383
    }
384

    
385
    if ((type = get_tcp_server_response(mmst)) != expect_type) {
386
        av_log(NULL, AV_LOG_ERROR,
387
               "Corrupt stream (unexpected packet type 0x%x, expected 0x%x)\n",
388
               type, expect_type);
389
        return AVERROR_INVALIDDATA;
390
    } else {
391
        return 0;
392
    }
393
}
394

    
395
static int send_media_header_request(MMSTContext *mmst)
396
{
397
    MMSContext *mms = &mmst->mms;
398
    start_command_packet(mmst, CS_PKT_MEDIA_HEADER_REQUEST);
399
    insert_command_prefixes(mms, 1, 0);
400
    bytestream_put_le32(&mms->write_out_ptr, 0);
401
    bytestream_put_le32(&mms->write_out_ptr, 0x00800000);
402
    bytestream_put_le32(&mms->write_out_ptr, 0xffffffff);
403
    bytestream_put_le32(&mms->write_out_ptr, 0);
404
    bytestream_put_le32(&mms->write_out_ptr, 0);
405
    bytestream_put_le32(&mms->write_out_ptr, 0);
406

    
407
    // the media preroll value in milliseconds?
408
    bytestream_put_le32(&mms->write_out_ptr, 0);
409
    bytestream_put_le32(&mms->write_out_ptr, 0x40AC2000);
410
    bytestream_put_le32(&mms->write_out_ptr, 2);
411
    bytestream_put_le32(&mms->write_out_ptr, 0);
412

    
413
    return send_command_packet(mmst);
414
}
415

    
416
/** Send the initial handshake. */
417
static int send_startup_packet(MMSTContext *mmst)
418
{
419
    char data_string[256];
420
    MMSContext *mms = &mmst->mms;
421
    // SubscriberName is defined in MS specification linked below.
422
    // The guid value can be any valid value.
423
    // http://download.microsoft.com/
424
    // download/9/5/E/95EF66AF-9026-4BB0-A41D-A4F81802D92C/%5BMS-WMSP%5D.pdf
425
    snprintf(data_string, sizeof(data_string),
426
            "NSPlayer/7.0.0.1956; {%s}; Host: %s",
427
            "7E667F5D-A661-495E-A512-F55686DDA178", mmst->host);
428

    
429
    start_command_packet(mmst, CS_PKT_INITIAL);
430
    insert_command_prefixes(mms, 0, 0x0004000b);
431
    bytestream_put_le32(&mms->write_out_ptr, 0x0003001c);
432
    mms_put_utf16(mms, data_string);
433
    return send_command_packet(mmst);
434
}
435

    
436
/** Send MMST stream selection command based on the AVStream->discard values. */
437
static int send_stream_selection_request(MMSTContext *mmst)
438
{
439
    int i;
440
    MMSContext *mms = &mmst->mms;
441
    //  send the streams we want back...
442
    start_command_packet(mmst, CS_PKT_STREAM_ID_REQUEST);
443
    bytestream_put_le32(&mms->write_out_ptr, mms->stream_num);         // stream nums
444
    for(i= 0; i<mms->stream_num; i++) {
445
        bytestream_put_le16(&mms->write_out_ptr, 0xffff);              // flags
446
        bytestream_put_le16(&mms->write_out_ptr, mms->streams[i].id);  // stream id
447
        bytestream_put_le16(&mms->write_out_ptr, 0);                   // selection
448
    }
449
    return send_command_packet(mmst);
450
}
451

    
452
static int send_close_packet(MMSTContext *mmst)
453
{
454
    start_command_packet(mmst, CS_PKT_STREAM_CLOSE);
455
    insert_command_prefixes(&mmst->mms, 1, 1);
456

    
457
    return send_command_packet(mmst);
458
}
459

    
460
/** Close the MMSH/MMST connection */
461
static int mms_close(URLContext *h)
462
{
463
    MMSTContext *mmst = (MMSTContext *)h->priv_data;
464
    MMSContext *mms   = &mmst->mms;
465
    if(mms->mms_hd) {
466
        send_close_packet(mmst);
467
        ffurl_close(mms->mms_hd);
468
    }
469

    
470
    /* free all separately allocated pointers in mms */
471
    av_free(mms->streams);
472
    av_free(mms->asf_header);
473
    av_freep(&h->priv_data);
474

    
475
    return 0;
476
}
477

    
478
static int send_media_packet_request(MMSTContext *mmst)
479
{
480
    MMSContext *mms = &mmst->mms;
481
    start_command_packet(mmst, CS_PKT_START_FROM_PKT_ID);
482
    insert_command_prefixes(mms, 1, 0x0001FFFF);
483
    bytestream_put_le64(&mms->write_out_ptr, 0);          // seek timestamp
484
    bytestream_put_le32(&mms->write_out_ptr, 0xffffffff); // unknown
485
    bytestream_put_le32(&mms->write_out_ptr, 0xffffffff); // packet offset
486
    bytestream_put_byte(&mms->write_out_ptr, 0xff);       // max stream time limit
487
    bytestream_put_byte(&mms->write_out_ptr, 0xff);       // max stream time limit
488
    bytestream_put_byte(&mms->write_out_ptr, 0xff);       // max stream time limit
489
    bytestream_put_byte(&mms->write_out_ptr, 0x00);       // stream time limit flag
490

    
491
    mmst->packet_id++;                                     // new packet_id
492
    bytestream_put_le32(&mms->write_out_ptr, mmst->packet_id);
493
    return send_command_packet(mmst);
494
}
495

    
496

    
497
static void clear_stream_buffers(MMSContext *mms)
498
{
499
    mms->remaining_in_len = 0;
500
    mms->read_in_ptr      = mms->in_buffer;
501
}
502

    
503
static int mms_open(URLContext *h, const char *uri, int flags)
504
{
505
    MMSTContext *mmst;
506
    MMSContext *mms;
507
    int port, err;
508
    char tcpname[256];
509

    
510
    h->is_streamed = 1;
511
    mmst = h->priv_data = av_mallocz(sizeof(MMSTContext));
512
    if (!h->priv_data)
513
        return AVERROR(ENOMEM);
514
    mms = &mmst->mms;
515

    
516
    // only for MMS over TCP, so set proto = NULL
517
    av_url_split(NULL, 0, NULL, 0,
518
            mmst->host, sizeof(mmst->host), &port, mmst->path,
519
            sizeof(mmst->path), uri);
520

    
521
    if(port<0)
522
        port = 1755; // defaut mms protocol port
523

    
524
    // establish tcp connection.
525
    ff_url_join(tcpname, sizeof(tcpname), "tcp", NULL, mmst->host, port, NULL);
526
    err = ffurl_open(&mms->mms_hd, tcpname, AVIO_FLAG_READ_WRITE);
527
    if (err)
528
        goto fail;
529

    
530
    mmst->packet_id        = 3;          // default, initial value.
531
    mmst->header_packet_id = 2;          // default, initial value.
532
    err = mms_safe_send_recv(mmst, send_startup_packet, SC_PKT_CLIENT_ACCEPTED);
533
    if (err)
534
        goto fail;
535
    err = mms_safe_send_recv(mmst, send_time_test_data, SC_PKT_TIMING_TEST_REPLY);
536
    if (err)
537
        goto fail;
538
    err = mms_safe_send_recv(mmst, send_protocol_select, SC_PKT_PROTOCOL_ACCEPTED);
539
    if (err)
540
        goto fail;
541
    err = mms_safe_send_recv(mmst, send_media_file_request, SC_PKT_MEDIA_FILE_DETAILS);
542
    if (err)
543
        goto fail;
544
    err = mms_safe_send_recv(mmst, send_media_header_request, SC_PKT_HEADER_REQUEST_ACCEPTED);
545
    if (err)
546
        goto fail;
547
    err = mms_safe_send_recv(mmst, NULL, SC_PKT_ASF_HEADER);
548
    if (err)
549
        goto fail;
550
    if((mmst->incoming_flags != 0X08) && (mmst->incoming_flags != 0X0C)) {
551
        av_log(NULL, AV_LOG_ERROR,
552
               "The server does not support MMST (try MMSH or RTSP)\n");
553
        err = AVERROR(EINVAL);
554
        goto fail;
555
    }
556
    err = ff_mms_asf_header_parser(mms);
557
    if (err) {
558
        av_dlog(NULL, "asf header parsed failed!\n");
559
        goto fail;
560
    }
561
    mms->header_parsed = 1;
562

    
563
    if (!mms->asf_packet_len || !mms->stream_num)
564
        goto fail;
565

    
566
    clear_stream_buffers(mms);
567
    err = mms_safe_send_recv(mmst, send_stream_selection_request, SC_PKT_STREAM_ID_ACCEPTED);
568
    if (err)
569
        goto fail;
570
    // send media packet request
571
    err = mms_safe_send_recv(mmst, send_media_packet_request, SC_PKT_MEDIA_PKT_FOLLOWS);
572
    if (err) {
573
        goto fail;
574
    }
575
    av_dlog(NULL, "Leaving open (success)\n");
576
    return 0;
577
fail:
578
    mms_close(h);
579
    av_dlog(NULL, "Leaving open (failure: %d)\n", err);
580
    return err;
581
}
582

    
583
/** Read ASF data through the protocol. */
584
static int mms_read(URLContext *h, uint8_t *buf, int size)
585
{
586
    /* TODO: see tcp.c:tcp_read() about a possible timeout scheme */
587
    MMSTContext *mmst = h->priv_data;
588
    MMSContext *mms   = &mmst->mms;
589
    int result = 0;
590

    
591
    do {
592
        if(mms->asf_header_read_size < mms->asf_header_size) {
593
            /* Read from ASF header buffer */
594
            result = ff_mms_read_header(mms, buf, size);
595
        } else if(mms->remaining_in_len) {
596
            /* Read remaining packet data to buffer.
597
             * the result can not be zero because remaining_in_len is positive.*/
598
            result = ff_mms_read_data(mms, buf, size);
599
        } else {
600
            /* Read from network */
601
            int err = mms_safe_send_recv(mmst, NULL, SC_PKT_ASF_MEDIA);
602
            if (err == 0) {
603
                if(mms->remaining_in_len>mms->asf_packet_len) {
604
                    av_log(NULL, AV_LOG_ERROR,
605
                           "Incoming pktlen %d is larger than ASF pktsize %d\n",
606
                           mms->remaining_in_len, mms->asf_packet_len);
607
                    result= AVERROR(EIO);
608
                } else {
609
                    // copy the data to the packet buffer.
610
                    result = ff_mms_read_data(mms, buf, size);
611
                    if (result == 0) {
612
                        av_dlog(NULL, "read asf media paket size is zero!\n");
613
                        break;
614
                    }
615
                }
616
            } else {
617
                av_dlog(NULL, "read packet error!\n");
618
                break;
619
            }
620
        }
621
    } while(!result); // only return one packet.
622
    return result;
623
}
624

    
625
URLProtocol ff_mmst_protocol = {
626
    .name      = "mmst",
627
    .url_open  = mms_open,
628
    .url_read  = mms_read,
629
    .url_close = mms_close,
630
};