git.sesse.net Git - ffmpeg/blob - libavformat/mmst.c

   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 "internal.h"
  33 #include "libavutil/intreadwrite.h"
  34 #include "libavcodec/bytestream.h"
  35 #include "network.h"
  36 #include "asf.h"
  37
  38 #define LOCAL_ADDRESS 0xc0a80081    // FIXME get and use correct local ip address.
  39 #define LOCAL_PORT    1037          // as above.
  40 /** Client to server packet types. */
  41 typedef enum {
  42     CS_PKT_INITIAL                  = 0x01,
  43     CS_PKT_PROTOCOL_SELECT          = 0x02,
  44     CS_PKT_MEDIA_FILE_REQUEST       = 0x05,
  45     CS_PKT_START_FROM_PKT_ID        = 0x07,
  46     CS_PKT_STREAM_PAUSE             = 0x09,
  47     CS_PKT_STREAM_CLOSE             = 0x0d,
  48     CS_PKT_MEDIA_HEADER_REQUEST     = 0x15,
  49     CS_PKT_TIMING_DATA_REQUEST      = 0x18,
  50     CS_PKT_USER_PASSWORD            = 0x1a,
  51     CS_PKT_KEEPALIVE                = 0x1b,
  52     CS_PKT_STREAM_ID_REQUEST        = 0x33,
  53 } MMSCSPacketType;
  54
  55 /** Server to client packet types. */
  56 typedef enum {
  57     /** Control packets. */
  58     /*@{*/
  59     SC_PKT_CLIENT_ACCEPTED          = 0x01,
  60     SC_PKT_PROTOCOL_ACCEPTED        = 0x02,
  61     SC_PKT_PROTOCOL_FAILED          = 0x03,
  62     SC_PKT_MEDIA_PKT_FOLLOWS        = 0x05,
  63     SC_PKT_MEDIA_FILE_DETAILS       = 0x06,
  64     SC_PKT_HEADER_REQUEST_ACCEPTED  = 0x11,
  65     SC_PKT_TIMING_TEST_REPLY        = 0x15,
  66     SC_PKT_PASSWORD_REQUIRED        = 0x1a,
  67     SC_PKT_KEEPALIVE                = 0x1b,
  68     SC_PKT_STREAM_STOPPED           = 0x1e,
  69     SC_PKT_STREAM_CHANGING          = 0x20,
  70     SC_PKT_STREAM_ID_ACCEPTED       = 0x21,
  71     /*@}*/
  72
  73     /** Pseudo packets. */
  74     /*@{*/
  75     SC_PKT_CANCEL                   = -1,
  76     SC_PKT_NO_DATA                  = -2,
  77     /*@}*/
  78
  79     /** Data packets. */
  80     /*@{*/
  81     SC_PKT_ASF_HEADER               = 0x010000,// make it bigger than 0xFF in case of
  82     SC_PKT_ASF_MEDIA                = 0x010001,// receiving false data packets.
  83     /*@}*/
  84 } MMSSCPacketType;
  85
  86 typedef struct {
  87     int id;
  88 }MMSStream;
  89
  90 typedef struct {
  91     int outgoing_packet_seq;             ///< Outgoing packet sequence number.
  92     char path[256];                      ///< Path of the resource being asked for.
  93     char host[128];                      ///< Host of the resources.
  94
  95     URLContext *mms_hd;                  ///< TCP connection handle
  96     MMSStream streams[MAX_STREAMS];
  97
  98     /** Buffer for outgoing packets. */
  99     /*@{*/
 100     uint8_t *write_out_ptr;              ///< Pointer for writting the buffer.
 101     uint8_t out_buffer[512];             ///< Buffer for outgoing packet.
 102     /*@}*/
 103
 104     /** Buffer for incoming packets. */
 105     /*@{*/
 106     uint8_t in_buffer[8192];             ///< Buffer for incoming packets.
 107     uint8_t *read_in_ptr;                ///< Pointer for reading from incoming buffer.
 108     int remaining_in_len;                ///< Reading length from incoming buffer.
 109     /*@}*/
 110
 111     int incoming_packet_seq;             ///< Incoming packet sequence number.
 112     int incoming_flags;                  ///< Incoming packet flags.
 113
 114     int packet_id;                       ///< Identifier for packets in the current stream.
 115     unsigned int header_packet_id;       ///< default is 2.
 116
 117     /** Internal handling of the ASF header */
 118     /*@{*/
 119     uint8_t *asf_header;                 ///< Stored ASF header.
 120     int asf_header_size;                 ///< Size of stored ASF header.
 121     int header_parsed;                   ///< The header has been received and parsed.
 122     int asf_packet_len;
 123     int asf_header_read_size;
 124     /*@}*/
 125
 126     int stream_num;                      ///< stream numbers.
 127 } MMSContext;
 128
 129 /** Create MMST command packet header */
 130 static void start_command_packet(MMSContext *mms, MMSCSPacketType packet_type)
 131 {
 132     mms->write_out_ptr = mms->out_buffer;
 133
 134     bytestream_put_le32(&mms->write_out_ptr, 1); // start sequence
 135     bytestream_put_le32(&mms->write_out_ptr, 0xb00bface);
 136     bytestream_put_le32(&mms->write_out_ptr, 0); // Length starts from after the protocol type bytes
 137     bytestream_put_le32(&mms->write_out_ptr, MKTAG('M','M','S',' '));
 138     bytestream_put_le32(&mms->write_out_ptr, 0);
 139     bytestream_put_le32(&mms->write_out_ptr, mms->outgoing_packet_seq++);
 140     bytestream_put_le64(&mms->write_out_ptr, 0); // timestamp
 141     bytestream_put_le32(&mms->write_out_ptr, 0);
 142     bytestream_put_le16(&mms->write_out_ptr, packet_type);
 143     bytestream_put_le16(&mms->write_out_ptr, 3); // direction to server
 144 }
 145
 146 /** Add prefixes to MMST command packet. */
 147 static void insert_command_prefixes(MMSContext *mms,
 148         uint32_t prefix1, uint32_t prefix2)
 149 {
 150     bytestream_put_le32(&mms->write_out_ptr, prefix1); // first prefix
 151     bytestream_put_le32(&mms->write_out_ptr, prefix2); // second prefix
 152 }
 153
 154 /** Send a prepared MMST command packet. */
 155 static int send_command_packet(MMSContext *mms)
 156 {
 157     int len= mms->write_out_ptr - mms->out_buffer;
 158     int exact_length = FFALIGN(len, 8);
 159     int first_length= exact_length - 16;
 160     int len8= first_length/8;
 161     int write_result;
 162
 163     // update packet length fields.
 164     AV_WL32(mms->out_buffer + 8, first_length);
 165     AV_WL32(mms->out_buffer + 16, len8);
 166     AV_WL32(mms->out_buffer + 32, len8-2);
 167     memset(mms->write_out_ptr, 0, exact_length - len);
 168
 169     // write it out.
 170     write_result= url_write(mms->mms_hd, mms->out_buffer, exact_length);
 171     if(write_result != exact_length) {
 172         av_log(NULL, AV_LOG_ERROR,
 173                "Failed to write data of length %d: %d (%s)\n",
 174                exact_length, write_result,
 175                write_result < 0 ? strerror(write_result) :
 176                    "The server closed the connection");
 177         return AVERROR_IO;
 178     }
 179
 180     return 0;
 181 }
 182
 183 static void mms_put_utf16(MMSContext *mms, uint8_t *src)
 184 {
 185     ByteIOContext bic;
 186     int size = mms->write_out_ptr - mms->out_buffer;
 187     int len;
 188     init_put_byte(&bic, mms->write_out_ptr,
 189             sizeof(mms->out_buffer) - size, 1, NULL, NULL, NULL, NULL);
 190
 191     len = ff_put_str16_nolen(&bic, src);
 192     mms->write_out_ptr += len;
 193 }
 194
 195 static int send_time_test_data(MMSContext *mms)
 196 {
 197     start_command_packet(mms, CS_PKT_TIMING_DATA_REQUEST);
 198     insert_command_prefixes(mms, 0xf0f0f0f1, 0x0004000b);
 199     return send_command_packet(mms);
 200 }
 201
 202 static int send_protocol_select(MMSContext *mms)
 203 {
 204     char data_string[256];
 205
 206     start_command_packet(mms, CS_PKT_PROTOCOL_SELECT);
 207     insert_command_prefixes(mms, 0, 0xffffffff);
 208     bytestream_put_le32(&mms->write_out_ptr, 0);          // maxFunnelBytes
 209     bytestream_put_le32(&mms->write_out_ptr, 0x00989680); // maxbitRate
 210     bytestream_put_le32(&mms->write_out_ptr, 2);          // funnelMode
 211     snprintf(data_string, sizeof(data_string), "\\\\%d.%d.%d.%d\\%s\\%d",
 212             (LOCAL_ADDRESS>>24)&0xff,
 213             (LOCAL_ADDRESS>>16)&0xff,
 214             (LOCAL_ADDRESS>>8)&0xff,
 215             LOCAL_ADDRESS&0xff,
 216             "TCP",                                        // or UDP
 217             LOCAL_PORT);
 218
 219     mms_put_utf16(mms, data_string);
 220     return send_command_packet(mms);
 221 }
 222
 223 static int send_media_file_request(MMSContext *mms)
 224 {
 225     start_command_packet(mms, CS_PKT_MEDIA_FILE_REQUEST);
 226     insert_command_prefixes(mms, 1, 0xffffffff);
 227     bytestream_put_le32(&mms->write_out_ptr, 0);
 228     bytestream_put_le32(&mms->write_out_ptr, 0);
 229     mms_put_utf16(mms, mms->path + 1); // +1 for skip "/"
 230
 231     return send_command_packet(mms);
 232 }
 233
 234 static void handle_packet_stream_changing_type(MMSContext *mms)
 235 {
 236     dprintf(NULL, "Stream changing!\n");
 237
 238     // 40 is the packet header size, 7 is the prefix size.
 239     mms->header_packet_id= AV_RL32(mms->in_buffer + 40 + 7);
 240     dprintf(NULL, "Changed header prefix to 0x%x", mms->header_packet_id);
 241 }
 242
 243 static int send_keepalive_packet(MMSContext *mms)
 244 {
 245     // respond to a keepalive with a keepalive...
 246     start_command_packet(mms, CS_PKT_KEEPALIVE);
 247     insert_command_prefixes(mms, 1, 0x100FFFF);
 248     return send_command_packet(mms);
 249 }
 250
 251 /** Pad media packets smaller than max_packet_size and/or adjust read position
 252   * after a seek. */
 253 static void pad_media_packet(MMSContext *mms)
 254 {
 255     if(mms->remaining_in_len<mms->asf_packet_len) {
 256         int padding_size = mms->asf_packet_len - mms->remaining_in_len;
 257         memset(mms->in_buffer + mms->remaining_in_len, 0, padding_size);
 258         mms->remaining_in_len += padding_size;
 259     }
 260 }
 261
 262 /** Read incoming MMST media, header or command packet. */
 263 static MMSSCPacketType get_tcp_server_response(MMSContext *mms)
 264 {
 265     int read_result;
 266     MMSSCPacketType packet_type= -1;
 267
 268     for(;;) {
 269         read_result = url_read_complete(mms->mms_hd, mms->in_buffer, 8);
 270         if (read_result != 8) {
 271             if(read_result < 0) {
 272                 av_log(NULL, AV_LOG_ERROR,
 273                        "Error reading packet header: %d (%s)\n",
 274                        read_result, strerror(read_result));
 275                 packet_type = SC_PKT_CANCEL;
 276             } else {
 277                 av_log(NULL, AV_LOG_ERROR,
 278                        "The server closed the connection\n");
 279                 packet_type = SC_PKT_NO_DATA;
 280             }
 281             return packet_type;
 282         }
 283
 284         // handle command packet.
 285         if(AV_RL32(mms->in_buffer + 4)==0xb00bface) {
 286             int length_remaining, hr;
 287
 288             mms->incoming_flags= mms->in_buffer[3];
 289             read_result= url_read_complete(mms->mms_hd, mms->in_buffer+8, 4);
 290             if(read_result != 4) {
 291                 av_log(NULL, AV_LOG_ERROR,
 292                        "Reading command packet length failed: %d (%s)\n",
 293                        read_result,
 294                        read_result < 0 ? strerror(read_result) :
 295                            "The server closed the connection");
 296                 return read_result < 0 ? read_result : AVERROR_IO;
 297             }
 298
 299             length_remaining= AV_RL32(mms->in_buffer+8) + 4;
 300             dprintf(NULL, "Length remaining is %d\n", length_remaining);
 301             // read the rest of the packet.
 302             if (length_remaining < 0
 303                 || length_remaining > sizeof(mms->in_buffer) - 12) {
 304                 av_log(NULL, AV_LOG_ERROR,
 305                        "Incoming packet length %d exceeds bufsize %zu\n",
 306                        length_remaining, sizeof(mms->in_buffer) - 12);
 307                 return AVERROR_INVALIDDATA;
 308             }
 309             read_result = url_read_complete(mms->mms_hd, mms->in_buffer + 12,
 310                                             length_remaining) ;
 311             if (read_result != length_remaining) {
 312                 av_log(NULL, AV_LOG_ERROR,
 313                        "Reading pkt data (length=%d) failed: %d (%s)\n",
 314                        length_remaining, read_result,
 315                        read_result < 0 ? strerror(read_result) :
 316                            "The server closed the connection");
 317                 return read_result < 0 ? read_result : AVERROR_IO;
 318             }
 319             packet_type= AV_RL16(mms->in_buffer+36);
 320             hr = AV_RL32(mms->in_buffer + 40);
 321             if (hr) {
 322                 av_log(NULL, AV_LOG_ERROR,
 323                        "Server sent an error status code: 0x%08x\n", hr);
 324                 return AVERROR_UNKNOWN;
 325             }
 326         } else {
 327             int length_remaining;
 328             int packet_id_type;
 329             int tmp;
 330
 331             // note we cache the first 8 bytes,
 332             // then fill up the buffer with the others
 333             tmp                       = AV_RL16(mms->in_buffer + 6);
 334             length_remaining          = (tmp - 8) & 0xffff;
 335             mms->incoming_packet_seq  = AV_RL32(mms->in_buffer);
 336             packet_id_type            = mms->in_buffer[4];
 337             mms->incoming_flags       = mms->in_buffer[5];
 338
 339             if (length_remaining < 0
 340                 || length_remaining > sizeof(mms->in_buffer) - 8) {
 341                 av_log(NULL, AV_LOG_ERROR,
 342                        "Data length %d is invalid or too large (max=%zu)\n",
 343                        length_remaining, sizeof(mms->in_buffer));
 344                 return AVERROR_INVALIDDATA;
 345             }
 346             mms->remaining_in_len    = length_remaining;
 347             mms->read_in_ptr         = mms->in_buffer;
 348             read_result= url_read_complete(mms->mms_hd, mms->in_buffer, length_remaining);
 349             if(read_result != length_remaining) {
 350                 av_log(NULL, AV_LOG_ERROR,
 351                        "Failed to read packet data of size %d: %d (%s)\n",
 352                        length_remaining, read_result,
 353                        read_result < 0 ? strerror(read_result) :
 354                            "The server closed the connection");
 355                 return read_result < 0 ? read_result : AVERROR_IO;
 356             }
 357
 358             // if we successfully read everything.
 359             if(packet_id_type == mms->header_packet_id) {
 360                 packet_type = SC_PKT_ASF_HEADER;
 361                 // Store the asf header
 362                 if(!mms->header_parsed) {
 363                     void *p = av_realloc(mms->asf_header,
 364                                   mms->asf_header_size + mms->remaining_in_len);
 365                     if (!p) {
 366                         av_freep(&mms->asf_header);
 367                         return AVERROR(ENOMEM);
 368                     }
 369                     mms->asf_header = p;
 370                     memcpy(mms->asf_header + mms->asf_header_size,
 371                            mms->read_in_ptr, mms->remaining_in_len);
 372                     mms->asf_header_size += mms->remaining_in_len;
 373                 }
 374                 // 0x04 means asf header is sent in multiple packets.
 375                 if (mms->incoming_flags == 0x04)
 376                     continue;
 377             } else if(packet_id_type == mms->packet_id) {
 378                 packet_type = SC_PKT_ASF_MEDIA;
 379             } else {
 380                 dprintf(NULL, "packet id type %d is old.", packet_id_type);
 381                 continue;
 382             }
 383         }
 384
 385         // preprocess some packet type
 386         if(packet_type == SC_PKT_KEEPALIVE) {
 387             send_keepalive_packet(mms);
 388             continue;
 389         } else if(packet_type == SC_PKT_STREAM_CHANGING) {
 390             handle_packet_stream_changing_type(mms);
 391         } else if(packet_type == SC_PKT_ASF_MEDIA) {
 392             pad_media_packet(mms);
 393         }
 394         return packet_type;
 395     }
 396 }
 397
 398 static int mms_safe_send_recv(MMSContext *mms,
 399                               int (*send_fun)(MMSContext *mms),
 400                               const MMSSCPacketType expect_type)
 401 {
 402     MMSSCPacketType type;
 403     if(send_fun) {
 404         int ret = send_fun(mms);
 405         if (ret < 0) {
 406             dprintf(NULL, "Send Packet error before expecting recv packet %d\n", expect_type);
 407             return ret;
 408         }
 409     }
 410
 411     if ((type = get_tcp_server_response(mms)) != expect_type) {
 412         av_log(NULL, AV_LOG_ERROR,
 413                "Corrupt stream (unexpected packet type 0x%x, expected 0x%x)\n",
 414                type, expect_type);
 415         return AVERROR_INVALIDDATA;
 416     } else {
 417         return 0;
 418     }
 419 }
 420
 421 static int send_media_header_request(MMSContext *mms)
 422 {
 423     start_command_packet(mms, CS_PKT_MEDIA_HEADER_REQUEST);
 424     insert_command_prefixes(mms, 1, 0);
 425     bytestream_put_le32(&mms->write_out_ptr, 0);
 426     bytestream_put_le32(&mms->write_out_ptr, 0x00800000);
 427     bytestream_put_le32(&mms->write_out_ptr, 0xffffffff);
 428     bytestream_put_le32(&mms->write_out_ptr, 0);
 429     bytestream_put_le32(&mms->write_out_ptr, 0);
 430     bytestream_put_le32(&mms->write_out_ptr, 0);
 431
 432     // the media preroll value in milliseconds?
 433     bytestream_put_le32(&mms->write_out_ptr, 0);
 434     bytestream_put_le32(&mms->write_out_ptr, 0x40AC2000);
 435     bytestream_put_le32(&mms->write_out_ptr, 2);
 436     bytestream_put_le32(&mms->write_out_ptr, 0);
 437
 438     return send_command_packet(mms);
 439 }
 440
 441 /** Send the initial handshake. */
 442 static int send_startup_packet(MMSContext *mms)
 443 {
 444     char data_string[256];
 445     // SubscriberName is defined in MS specification linked below.
 446     // The guid value can be any valid value.
 447     // http://download.microsoft.com/
 448     // download/9/5/E/95EF66AF-9026-4BB0-A41D-A4F81802D92C/%5BMS-WMSP%5D.pdf
 449     snprintf(data_string, sizeof(data_string),
 450             "NSPlayer/7.0.0.1956; {%s}; Host: %s",
 451             "7E667F5D-A661-495E-A512-F55686DDA178", mms->host);
 452
 453     start_command_packet(mms, CS_PKT_INITIAL);
 454     insert_command_prefixes(mms, 0, 0x0004000b);
 455     bytestream_put_le32(&mms->write_out_ptr, 0x0003001c);
 456     mms_put_utf16(mms, data_string);
 457     return send_command_packet(mms);
 458 }
 459
 460 static int asf_header_parser(MMSContext *mms)
 461 {
 462     uint8_t *p = mms->asf_header;
 463     uint8_t *end;
 464     int flags, stream_id;
 465     mms->stream_num = 0;
 466
 467     if (mms->asf_header_size < sizeof(ff_asf_guid) * 2 + 22 ||
 468         memcmp(p, ff_asf_header, sizeof(ff_asf_guid))) {
 469         av_log(NULL, AV_LOG_ERROR,
 470                "Corrupt stream (invalid ASF header, size=%d)\n",
 471                mms->asf_header_size);
 472         return AVERROR_INVALIDDATA;
 473     }
 474
 475     end = mms->asf_header + mms->asf_header_size;
 476
 477     p += sizeof(ff_asf_guid) + 14;
 478     while(end - p >= sizeof(ff_asf_guid) + 8) {
 479         uint64_t chunksize = AV_RL64(p + sizeof(ff_asf_guid));
 480         if (!chunksize || chunksize > end - p) {
 481             av_log(NULL, AV_LOG_ERROR,
 482                    "Corrupt stream (header chunksize %"PRId64" is invalid)\n",
 483                    chunksize);
 484             return AVERROR_INVALIDDATA;
 485         }
 486         if (!memcmp(p, ff_asf_file_header, sizeof(ff_asf_guid))) {
 487             /* read packet size */
 488             if (end - p > sizeof(ff_asf_guid) * 2 + 68) {
 489                 mms->asf_packet_len = AV_RL32(p + sizeof(ff_asf_guid) * 2 + 64);
 490                 if (mms->asf_packet_len <= 0 || mms->asf_packet_len > sizeof(mms->in_buffer)) {
 491                     av_log(NULL, AV_LOG_ERROR,
 492                            "Corrupt stream (too large pkt_len %d)\n",
 493                            mms->asf_packet_len);
 494                     return AVERROR_INVALIDDATA;
 495                 }
 496             }
 497         } else if (!memcmp(p, ff_asf_stream_header, sizeof(ff_asf_guid))) {
 498             flags     = AV_RL16(p + sizeof(ff_asf_guid)*3 + 24);
 499             stream_id = flags & 0x7F;
 500             //The second condition is for checking CS_PKT_STREAM_ID_REQUEST packet size,
 501             //we can calcuate the packet size by stream_num.
 502             //Please see function send_stream_selection_request().
 503             if (mms->stream_num < MAX_STREAMS &&
 504                     46 + mms->stream_num * 6 < sizeof(mms->out_buffer)) {
 505                 mms->streams[mms->stream_num].id = stream_id;
 506                 mms->stream_num++;
 507             } else {
 508                 av_log(NULL, AV_LOG_ERROR,
 509                        "Corrupt stream (too many A/V streams)\n");
 510                 return AVERROR_INVALIDDATA;
 511             }
 512         } else if (!memcmp(p, ff_asf_head1_guid, sizeof(ff_asf_guid))) {
 513             chunksize = 46; // see references [2] section 3.4. This should be set 46.
 514         }
 515         p += chunksize;
 516     }
 517
 518     return 0;
 519 }
 520
 521 /** Send MMST stream selection command based on the AVStream->discard values. */
 522 static int send_stream_selection_request(MMSContext *mms)
 523 {
 524     int i;
 525
 526     //  send the streams we want back...
 527     start_command_packet(mms, CS_PKT_STREAM_ID_REQUEST);
 528     bytestream_put_le32(&mms->write_out_ptr, mms->stream_num);         // stream nums
 529     for(i= 0; i<mms->stream_num; i++) {
 530         bytestream_put_le16(&mms->write_out_ptr, 0xffff);              // flags
 531         bytestream_put_le16(&mms->write_out_ptr, mms->streams[i].id);  // stream id
 532         bytestream_put_le16(&mms->write_out_ptr, 0);                   // selection
 533     }
 534     return send_command_packet(mms);
 535 }
 536
 537 static int read_data(MMSContext *mms, uint8_t *buf, const int buf_size)
 538 {
 539     int read_size;
 540     read_size = FFMIN(buf_size, mms->remaining_in_len);
 541     memcpy(buf, mms->read_in_ptr, read_size);
 542     mms->remaining_in_len -= read_size;
 543     mms->read_in_ptr      += read_size;
 544     return read_size;
 545 }
 546
 547 static 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 */
 556 static 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
 572 static int send_media_packet_request(MMSContext *mms)
 573 {
 574     start_command_packet(mms, CS_PKT_START_FROM_PKT_ID);
 575     insert_command_prefixes(mms, 1, 0x0001FFFF);
 576     bytestream_put_le64(&mms->write_out_ptr, 0);          // seek timestamp
 577     bytestream_put_le32(&mms->write_out_ptr, 0xffffffff); // unknown
 578     bytestream_put_le32(&mms->write_out_ptr, 0xffffffff); // packet offset
 579     bytestream_put_byte(&mms->write_out_ptr, 0xff);       // max stream time limit
 580     bytestream_put_byte(&mms->write_out_ptr, 0xff);       // max stream time limit
 581     bytestream_put_byte(&mms->write_out_ptr, 0xff);       // max stream time limit
 582     bytestream_put_byte(&mms->write_out_ptr, 0x00);       // stream time limit flag
 583
 584     mms->packet_id++;                                     // new packet_id
 585     bytestream_put_le32(&mms->write_out_ptr, mms->packet_id);
 586     return send_command_packet(mms);
 587 }
 588
 589
 590 static void clear_stream_buffers(MMSContext *mms)
 591 {
 592     mms->remaining_in_len = 0;
 593     mms->read_in_ptr      = mms->in_buffer;
 594 }
 595
 596 static int mms_open(URLContext *h, const char *uri, int flags)
 597 {
 598     MMSContext *mms;
 599     int port, err;
 600     char tcpname[256];
 601
 602     h->is_streamed = 1;
 603     mms = h->priv_data = av_mallocz(sizeof(MMSContext));
 604     if (!h->priv_data)
 605         return AVERROR(ENOMEM);
 606
 607     // only for MMS over TCP, so set proto = NULL
 608     av_url_split(NULL, 0, NULL, 0,
 609             mms->host, sizeof(mms->host), &port, mms->path,
 610             sizeof(mms->path), uri);
 611
 612     if(port<0)
 613         port = 1755; // defaut mms protocol port
 614
 615     // establish tcp connection.
 616     ff_url_join(tcpname, sizeof(tcpname), "tcp", NULL, mms->host, port, NULL);
 617     err = url_open(&mms->mms_hd, tcpname, URL_RDWR);
 618     if (err)
 619         goto fail;
 620
 621     mms->packet_id        = 3;          // default, initial value.
 622     mms->header_packet_id = 2;          // default, initial value.
 623     err = mms_safe_send_recv(mms, send_startup_packet, SC_PKT_CLIENT_ACCEPTED);
 624     if (err)
 625         goto fail;
 626     err = mms_safe_send_recv(mms, send_time_test_data, SC_PKT_TIMING_TEST_REPLY);
 627     if (err)
 628         goto fail;
 629     err = mms_safe_send_recv(mms, send_protocol_select, SC_PKT_PROTOCOL_ACCEPTED);
 630     if (err)
 631         goto fail;
 632     err = mms_safe_send_recv(mms, send_media_file_request, SC_PKT_MEDIA_FILE_DETAILS);
 633     if (err)
 634         goto fail;
 635     err = mms_safe_send_recv(mms, send_media_header_request, SC_PKT_HEADER_REQUEST_ACCEPTED);
 636     if (err)
 637         goto fail;
 638     err = mms_safe_send_recv(mms, NULL, SC_PKT_ASF_HEADER);
 639     if (err)
 640         goto fail;
 641     if((mms->incoming_flags != 0X08) && (mms->incoming_flags != 0X0C))
 642         goto fail;
 643     err = asf_header_parser(mms);
 644     if (err) {
 645         dprintf(NULL, "asf header parsed failed!\n");
 646         goto fail;
 647     }
 648     mms->header_parsed = 1;
 649
 650     if (!mms->asf_packet_len || !mms->stream_num)
 651         goto fail;
 652
 653     clear_stream_buffers(mms);
 654     err = mms_safe_send_recv(mms, send_stream_selection_request, SC_PKT_STREAM_ID_ACCEPTED);
 655     if (err)
 656         goto fail;
 657     // send media packet request
 658     err = mms_safe_send_recv(mms, send_media_packet_request, SC_PKT_MEDIA_PKT_FOLLOWS);
 659     if (err) {
 660         goto fail;
 661     }
 662     dprintf(NULL, "Leaving open (success)\n");
 663     return 0;
 664 fail:
 665     mms_close(h);
 666     dprintf(NULL, "Leaving open (failure: %d)\n", err);
 667     return err;
 668 }
 669
 670 /** Read ASF data through the protocol. */
 671 static int mms_read(URLContext *h, uint8_t *buf, int size)
 672 {
 673     /* TODO: see tcp.c:tcp_read() about a possible timeout scheme */
 674     MMSContext *mms = h->priv_data;
 675     int result = 0;
 676     int size_to_copy;
 677
 678     do {
 679         if(mms->asf_header_read_size < mms->asf_header_size) {
 680             /* Read from ASF header buffer */
 681             size_to_copy= FFMIN(size,
 682                                 mms->asf_header_size - mms->asf_header_read_size);
 683             memcpy(buf, mms->asf_header + mms->asf_header_read_size, size_to_copy);
 684             mms->asf_header_read_size += size_to_copy;
 685             result += size_to_copy;
 686             dprintf(NULL, "Copied %d bytes from stored header. left: %d\n",
 687                    size_to_copy, mms->asf_header_size - mms->asf_header_read_size);
 688             if (mms->asf_header_size == mms->asf_header_read_size) {
 689                 av_freep(&mms->asf_header);
 690             }
 691         } else if(mms->remaining_in_len) {
 692             /* Read remaining packet data to buffer.
 693              * the result can not be zero because remaining_in_len is positive.*/
 694             result = read_data(mms, buf, size);
 695         } else {
 696             /* Read from network */
 697             int err = mms_safe_send_recv(mms, NULL, SC_PKT_ASF_MEDIA);
 698             if (err == 0) {
 699                 if(mms->remaining_in_len>mms->asf_packet_len) {
 700                     av_log(NULL, AV_LOG_ERROR,
 701                            "Incoming pktlen %d is larger than ASF pktsize %d\n",
 702                            mms->remaining_in_len, mms->asf_packet_len);
 703                     result= AVERROR_IO;
 704                 } else {
 705                     // copy the data to the packet buffer.
 706                     result = read_data(mms, buf, size);
 707                     if (result == 0) {
 708                         dprintf(NULL, "read asf media paket size is zero!\n");
 709                         break;
 710                     }
 711                 }
 712             } else {
 713                 dprintf(NULL, "read packet error!\n");
 714                 break;
 715             }
 716         }
 717     } while(!result); // only return one packet.
 718     return result;
 719 }
 720
 721 URLProtocol mmst_protocol = {
 722     "mmst",
 723     mms_open,
 724     mms_read,
 725     NULL, // write
 726     NULL, // seek
 727     mms_close,
 728 };