LCOV - code coverage report
Current view: top level - libavformat - mmst.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 0 309 0.0 %
Date: 2017-12-11 04:34:20 Functions: 0 21 0.0 %

          Line data    Source code
       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 */
     100           0 : static void start_command_packet(MMSTContext *mmst, MMSCSPacketType packet_type)
     101             : {
     102           0 :     MMSContext *mms    = &mmst->mms;
     103           0 :     mms->write_out_ptr = mms->out_buffer;
     104             : 
     105           0 :     bytestream_put_le32(&mms->write_out_ptr, 1); // start sequence
     106           0 :     bytestream_put_le32(&mms->write_out_ptr, 0xb00bface);
     107           0 :     bytestream_put_le32(&mms->write_out_ptr, 0); // Length starts from after the protocol type bytes
     108           0 :     bytestream_put_le32(&mms->write_out_ptr, MKTAG('M','M','S',' '));
     109           0 :     bytestream_put_le32(&mms->write_out_ptr, 0);
     110           0 :     bytestream_put_le32(&mms->write_out_ptr, mmst->outgoing_packet_seq++);
     111           0 :     bytestream_put_le64(&mms->write_out_ptr, 0); // timestamp
     112           0 :     bytestream_put_le32(&mms->write_out_ptr, 0);
     113           0 :     bytestream_put_le16(&mms->write_out_ptr, packet_type);
     114           0 :     bytestream_put_le16(&mms->write_out_ptr, 3); // direction to server
     115           0 : }
     116             : 
     117             : /** Add prefixes to MMST command packet. */
     118           0 : static void insert_command_prefixes(MMSContext *mms,
     119             :         uint32_t prefix1, uint32_t prefix2)
     120             : {
     121           0 :     bytestream_put_le32(&mms->write_out_ptr, prefix1); // first prefix
     122           0 :     bytestream_put_le32(&mms->write_out_ptr, prefix2); // second prefix
     123           0 : }
     124             : 
     125             : /** Send a prepared MMST command packet. */
     126           0 : static int send_command_packet(MMSTContext *mmst)
     127             : {
     128           0 :     MMSContext *mms  = &mmst->mms;
     129           0 :     int len= mms->write_out_ptr - mms->out_buffer;
     130           0 :     int exact_length = FFALIGN(len, 8);
     131           0 :     int first_length= exact_length - 16;
     132           0 :     int len8= first_length/8;
     133             :     int write_result;
     134             : 
     135             :     // update packet length fields.
     136           0 :     AV_WL32(mms->out_buffer + 8, first_length);
     137           0 :     AV_WL32(mms->out_buffer + 16, len8);
     138           0 :     AV_WL32(mms->out_buffer + 32, len8-2);
     139           0 :     memset(mms->write_out_ptr, 0, exact_length - len);
     140             : 
     141             :     // write it out.
     142           0 :     write_result= ffurl_write(mms->mms_hd, mms->out_buffer, exact_length);
     143           0 :     if(write_result != exact_length) {
     144           0 :         av_log(NULL, AV_LOG_ERROR,
     145             :                "Failed to write data of length %d: %d (%s)\n",
     146             :                exact_length, write_result,
     147           0 :                write_result < 0 ? strerror(AVUNERROR(write_result)) :
     148             :                    "The server closed the connection");
     149           0 :         return AVERROR(EIO);
     150             :     }
     151             : 
     152           0 :     return 0;
     153             : }
     154             : 
     155           0 : static int mms_put_utf16(MMSContext *mms, const uint8_t *src)
     156             : {
     157             :     AVIOContext bic;
     158           0 :     int size = mms->write_out_ptr - mms->out_buffer;
     159             :     int len;
     160           0 :     ffio_init_context(&bic, mms->write_out_ptr,
     161           0 :             sizeof(mms->out_buffer) - size, 1, NULL, NULL, NULL, NULL);
     162             : 
     163           0 :     len = avio_put_str16le(&bic, src);
     164           0 :     if (len < 0)
     165           0 :         return len;
     166           0 :     mms->write_out_ptr += len;
     167           0 :     return 0;
     168             : }
     169             : 
     170           0 : static int send_time_test_data(MMSTContext *mmst)
     171             : {
     172           0 :     start_command_packet(mmst, CS_PKT_TIMING_DATA_REQUEST);
     173           0 :     insert_command_prefixes(&mmst->mms, 0x00f0f0f0, 0x0004000b);
     174           0 :     return send_command_packet(mmst);
     175             : }
     176             : 
     177           0 : static int send_protocol_select(MMSTContext *mmst)
     178             : {
     179             :     int ret;
     180             :     char data_string[256];
     181           0 :     MMSContext *mms = &mmst->mms;
     182             : 
     183           0 :     start_command_packet(mmst, CS_PKT_PROTOCOL_SELECT);
     184           0 :     insert_command_prefixes(mms, 0, 0xffffffff);
     185           0 :     bytestream_put_le32(&mms->write_out_ptr, 0);          // maxFunnelBytes
     186           0 :     bytestream_put_le32(&mms->write_out_ptr, 0x00989680); // maxbitRate
     187           0 :     bytestream_put_le32(&mms->write_out_ptr, 2);          // funnelMode
     188           0 :     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           0 :     if ((ret = mms_put_utf16(mms, data_string)) < 0)
     197           0 :         return ret;
     198           0 :     return send_command_packet(mmst);
     199             : }
     200             : 
     201           0 : static int send_media_file_request(MMSTContext *mmst)
     202             : {
     203             :     int ret;
     204           0 :     MMSContext *mms = &mmst->mms;
     205           0 :     start_command_packet(mmst, CS_PKT_MEDIA_FILE_REQUEST);
     206           0 :     insert_command_prefixes(mms, 1, 0xffffffff);
     207           0 :     bytestream_put_le32(&mms->write_out_ptr, 0);
     208           0 :     bytestream_put_le32(&mms->write_out_ptr, 0);
     209           0 :     if ((ret = mms_put_utf16(mms, mmst->path + 1)) < 0) // +1 for skip "/"
     210           0 :         return ret;
     211             : 
     212           0 :     return send_command_packet(mmst);
     213             : }
     214             : 
     215           0 : static void handle_packet_stream_changing_type(MMSTContext *mmst)
     216             : {
     217           0 :     MMSContext *mms = &mmst->mms;
     218           0 :     av_log(NULL, AV_LOG_TRACE, "Stream changing!\n");
     219             : 
     220             :     // 40 is the packet header size, 7 is the prefix size.
     221           0 :     mmst->header_packet_id= AV_RL32(mms->in_buffer + 40 + 7);
     222           0 :     av_log(NULL, AV_LOG_TRACE, "Changed header prefix to 0x%x", mmst->header_packet_id);
     223           0 : }
     224             : 
     225           0 : static int send_keepalive_packet(MMSTContext *mmst)
     226             : {
     227             :     // respond to a keepalive with a keepalive...
     228           0 :     start_command_packet(mmst, CS_PKT_KEEPALIVE);
     229           0 :     insert_command_prefixes(&mmst->mms, 1, 0x100FFFF);
     230           0 :     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. */
     235           0 : static void pad_media_packet(MMSContext *mms)
     236             : {
     237           0 :     if(mms->remaining_in_len<mms->asf_packet_len) {
     238           0 :         int padding_size = mms->asf_packet_len - mms->remaining_in_len;
     239           0 :         memset(mms->in_buffer + mms->remaining_in_len, 0, padding_size);
     240           0 :         mms->remaining_in_len += padding_size;
     241             :     }
     242           0 : }
     243             : 
     244             : /** Read incoming MMST media, header or command packet. */
     245           0 : static MMSSCPacketType get_tcp_server_response(MMSTContext *mmst)
     246             : {
     247             :     int read_result;
     248           0 :     MMSSCPacketType packet_type= -1;
     249           0 :     MMSContext *mms = &mmst->mms;
     250             :     for(;;) {
     251           0 :         read_result = ffurl_read_complete(mms->mms_hd, mms->in_buffer, 8);
     252           0 :         if (read_result != 8) {
     253           0 :             if(read_result < 0) {
     254           0 :                 av_log(NULL, AV_LOG_ERROR,
     255             :                        "Error reading packet header: %d (%s)\n",
     256             :                        read_result, strerror(AVUNERROR(read_result)));
     257           0 :                 packet_type = SC_PKT_CANCEL;
     258             :             } else {
     259           0 :                 av_log(NULL, AV_LOG_ERROR,
     260             :                        "The server closed the connection\n");
     261           0 :                 packet_type = SC_PKT_NO_DATA;
     262             :             }
     263           0 :             return packet_type;
     264             :         }
     265             : 
     266             :         // handle command packet.
     267           0 :         if(AV_RL32(mms->in_buffer + 4)==0xb00bface) {
     268             :             int length_remaining, hr;
     269             : 
     270           0 :             mmst->incoming_flags= mms->in_buffer[3];
     271           0 :             read_result= ffurl_read_complete(mms->mms_hd, mms->in_buffer+8, 4);
     272           0 :             if(read_result != 4) {
     273           0 :                 av_log(NULL, AV_LOG_ERROR,
     274             :                        "Reading command packet length failed: %d (%s)\n",
     275             :                        read_result,
     276           0 :                        read_result < 0 ? strerror(AVUNERROR(read_result)) :
     277             :                            "The server closed the connection");
     278           0 :                 return read_result < 0 ? read_result : AVERROR(EIO);
     279             :             }
     280             : 
     281           0 :             length_remaining= AV_RL32(mms->in_buffer+8) + 4;
     282           0 :             av_log(NULL, AV_LOG_TRACE, "Length remaining is %d\n", length_remaining);
     283             :             // read the rest of the packet.
     284           0 :             if (length_remaining < 0
     285           0 :                 || length_remaining > sizeof(mms->in_buffer) - 12) {
     286           0 :                 av_log(NULL, AV_LOG_ERROR,
     287             :                        "Incoming packet length %d exceeds bufsize %"SIZE_SPECIFIER"\n",
     288             :                        length_remaining, sizeof(mms->in_buffer) - 12);
     289           0 :                 return AVERROR_INVALIDDATA;
     290             :             }
     291           0 :             read_result = ffurl_read_complete(mms->mms_hd, mms->in_buffer + 12,
     292             :                                             length_remaining) ;
     293           0 :             if (read_result != length_remaining) {
     294           0 :                 av_log(NULL, AV_LOG_ERROR,
     295             :                        "Reading pkt data (length=%d) failed: %d (%s)\n",
     296             :                        length_remaining, read_result,
     297           0 :                        read_result < 0 ? strerror(AVUNERROR(read_result)) :
     298             :                            "The server closed the connection");
     299           0 :                 return read_result < 0 ? read_result : AVERROR(EIO);
     300             :             }
     301           0 :             packet_type= AV_RL16(mms->in_buffer+36);
     302           0 :             if (read_result >= 44 && (hr = AV_RL32(mms->in_buffer + 40))) {
     303           0 :                 av_log(NULL, AV_LOG_ERROR,
     304             :                        "Server sent a message with packet type 0x%x and error status code 0x%08x\n", packet_type, hr);
     305           0 :                 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           0 :             tmp                       = AV_RL16(mms->in_buffer + 6);
     315           0 :             length_remaining          = (tmp - 8) & 0xffff;
     316           0 :             mmst->incoming_packet_seq = AV_RL32(mms->in_buffer);
     317           0 :             packet_id_type            = mms->in_buffer[4];
     318           0 :             mmst->incoming_flags      = mms->in_buffer[5];
     319             : 
     320           0 :             if (length_remaining < 0
     321           0 :                 || length_remaining > sizeof(mms->in_buffer) - 8) {
     322           0 :                 av_log(NULL, AV_LOG_ERROR,
     323             :                        "Data length %d is invalid or too large (max=%"SIZE_SPECIFIER")\n",
     324             :                        length_remaining, sizeof(mms->in_buffer));
     325           0 :                 return AVERROR_INVALIDDATA;
     326             :             }
     327           0 :             mms->remaining_in_len    = length_remaining;
     328           0 :             mms->read_in_ptr         = mms->in_buffer;
     329           0 :             read_result= ffurl_read_complete(mms->mms_hd, mms->in_buffer, length_remaining);
     330           0 :             if(read_result != length_remaining) {
     331           0 :                 av_log(NULL, AV_LOG_ERROR,
     332             :                        "Failed to read packet data of size %d: %d (%s)\n",
     333             :                        length_remaining, read_result,
     334           0 :                        read_result < 0 ? strerror(AVUNERROR(read_result)) :
     335             :                            "The server closed the connection");
     336           0 :                 return read_result < 0 ? read_result : AVERROR(EIO);
     337             :             }
     338             : 
     339             :             // if we successfully read everything.
     340           0 :             if(packet_id_type == mmst->header_packet_id) {
     341             :                 int err;
     342           0 :                 packet_type = SC_PKT_ASF_HEADER;
     343             :                 // Store the asf header
     344           0 :                 if(!mms->header_parsed) {
     345           0 :                     if ((err = av_reallocp(&mms->asf_header,
     346           0 :                                            mms->asf_header_size +
     347           0 :                                            mms->remaining_in_len)) < 0) {
     348           0 :                         mms->asf_header_size = 0;
     349           0 :                         return err;
     350             :                     }
     351           0 :                     memcpy(mms->asf_header + mms->asf_header_size,
     352           0 :                            mms->read_in_ptr, mms->remaining_in_len);
     353           0 :                     mms->asf_header_size += mms->remaining_in_len;
     354             :                 }
     355             :                 // 0x04 means asf header is sent in multiple packets.
     356           0 :                 if (mmst->incoming_flags == 0x04)
     357           0 :                     continue;
     358           0 :             } else if(packet_id_type == mmst->packet_id) {
     359           0 :                 packet_type = SC_PKT_ASF_MEDIA;
     360             :             } else {
     361           0 :                 av_log(NULL, AV_LOG_TRACE, "packet id type %d is old.", packet_id_type);
     362           0 :                 continue;
     363             :             }
     364             :         }
     365             : 
     366             :         // preprocess some packet type
     367           0 :         if(packet_type == SC_PKT_KEEPALIVE) {
     368           0 :             send_keepalive_packet(mmst);
     369           0 :             continue;
     370           0 :         } else if(packet_type == SC_PKT_STREAM_CHANGING) {
     371           0 :             handle_packet_stream_changing_type(mmst);
     372           0 :         } else if(packet_type == SC_PKT_ASF_MEDIA) {
     373           0 :             pad_media_packet(mms);
     374             :         }
     375           0 :         return packet_type;
     376             :     }
     377             : }
     378             : 
     379           0 : static int mms_safe_send_recv(MMSTContext *mmst,
     380             :                               int (*send_fun)(MMSTContext *mmst),
     381             :                               const MMSSCPacketType expect_type)
     382             : {
     383             :     MMSSCPacketType type;
     384           0 :     if(send_fun) {
     385           0 :         int ret = send_fun(mmst);
     386           0 :         if (ret < 0) {
     387           0 :             av_log(NULL, AV_LOG_TRACE, "Send Packet error before expecting recv packet %d\n", expect_type);
     388           0 :             return ret;
     389             :         }
     390             :     }
     391             : 
     392           0 :     if ((type = get_tcp_server_response(mmst)) != expect_type) {
     393           0 :         av_log(NULL, AV_LOG_ERROR,
     394             :                "Corrupt stream (unexpected packet type 0x%x, expected 0x%x)\n",
     395             :                type, expect_type);
     396           0 :         return AVERROR_INVALIDDATA;
     397             :     } else {
     398           0 :         return 0;
     399             :     }
     400             : }
     401             : 
     402           0 : static int send_media_header_request(MMSTContext *mmst)
     403             : {
     404           0 :     MMSContext *mms = &mmst->mms;
     405           0 :     start_command_packet(mmst, CS_PKT_MEDIA_HEADER_REQUEST);
     406           0 :     insert_command_prefixes(mms, 1, 0);
     407           0 :     bytestream_put_le32(&mms->write_out_ptr, 0);
     408           0 :     bytestream_put_le32(&mms->write_out_ptr, 0x00800000);
     409           0 :     bytestream_put_le32(&mms->write_out_ptr, 0xffffffff);
     410           0 :     bytestream_put_le32(&mms->write_out_ptr, 0);
     411           0 :     bytestream_put_le32(&mms->write_out_ptr, 0);
     412           0 :     bytestream_put_le32(&mms->write_out_ptr, 0);
     413             : 
     414             :     // the media preroll value in milliseconds?
     415           0 :     bytestream_put_le32(&mms->write_out_ptr, 0);
     416           0 :     bytestream_put_le32(&mms->write_out_ptr, 0x40AC2000);
     417           0 :     bytestream_put_le32(&mms->write_out_ptr, 2);
     418           0 :     bytestream_put_le32(&mms->write_out_ptr, 0);
     419             : 
     420           0 :     return send_command_packet(mmst);
     421             : }
     422             : 
     423             : /** Send the initial handshake. */
     424           0 : static int send_startup_packet(MMSTContext *mmst)
     425             : {
     426             :     char data_string[256];
     427             :     int ret;
     428           0 :     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           0 :     snprintf(data_string, sizeof(data_string),
     434             :             "NSPlayer/7.0.0.1956; {%s}; Host: %s",
     435           0 :             "7E667F5D-A661-495E-A512-F55686DDA178", mmst->host);
     436             : 
     437           0 :     start_command_packet(mmst, CS_PKT_INITIAL);
     438           0 :     insert_command_prefixes(mms, 0, 0x0004000b);
     439           0 :     bytestream_put_le32(&mms->write_out_ptr, 0x0003001c);
     440           0 :     if ((ret = mms_put_utf16(mms, data_string)) < 0)
     441           0 :         return ret;
     442           0 :     return send_command_packet(mmst);
     443             : }
     444             : 
     445             : /** Send MMST stream selection command based on the AVStream->discard values. */
     446           0 : static int send_stream_selection_request(MMSTContext *mmst)
     447             : {
     448             :     int i;
     449           0 :     MMSContext *mms = &mmst->mms;
     450             :     //  send the streams we want back...
     451           0 :     start_command_packet(mmst, CS_PKT_STREAM_ID_REQUEST);
     452           0 :     bytestream_put_le32(&mms->write_out_ptr, mms->stream_num);         // stream nums
     453           0 :     for(i= 0; i<mms->stream_num; i++) {
     454           0 :         bytestream_put_le16(&mms->write_out_ptr, 0xffff);              // flags
     455           0 :         bytestream_put_le16(&mms->write_out_ptr, mms->streams[i].id);  // stream id
     456           0 :         bytestream_put_le16(&mms->write_out_ptr, 0);                   // selection
     457             :     }
     458           0 :     return send_command_packet(mmst);
     459             : }
     460             : 
     461           0 : static int send_close_packet(MMSTContext *mmst)
     462             : {
     463           0 :     start_command_packet(mmst, CS_PKT_STREAM_CLOSE);
     464           0 :     insert_command_prefixes(&mmst->mms, 1, 1);
     465             : 
     466           0 :     return send_command_packet(mmst);
     467             : }
     468             : 
     469             : /** Close the MMSH/MMST connection */
     470           0 : static int mms_close(URLContext *h)
     471             : {
     472           0 :     MMSTContext *mmst = (MMSTContext *)h->priv_data;
     473           0 :     MMSContext *mms   = &mmst->mms;
     474           0 :     if(mms->mms_hd) {
     475           0 :         send_close_packet(mmst);
     476           0 :         ffurl_close(mms->mms_hd);
     477             :     }
     478             : 
     479             :     /* free all separately allocated pointers in mms */
     480           0 :     av_freep(&mms->streams);
     481           0 :     av_freep(&mms->asf_header);
     482             : 
     483           0 :     return 0;
     484             : }
     485             : 
     486           0 : static int send_media_packet_request(MMSTContext *mmst)
     487             : {
     488           0 :     MMSContext *mms = &mmst->mms;
     489           0 :     start_command_packet(mmst, CS_PKT_START_FROM_PKT_ID);
     490           0 :     insert_command_prefixes(mms, 1, 0x0001FFFF);
     491           0 :     bytestream_put_le64(&mms->write_out_ptr, 0);          // seek timestamp
     492           0 :     bytestream_put_le32(&mms->write_out_ptr, 0xffffffff); // unknown
     493           0 :     bytestream_put_le32(&mms->write_out_ptr, 0xffffffff); // packet offset
     494           0 :     bytestream_put_byte(&mms->write_out_ptr, 0xff);       // max stream time limit
     495           0 :     bytestream_put_byte(&mms->write_out_ptr, 0xff);       // max stream time limit
     496           0 :     bytestream_put_byte(&mms->write_out_ptr, 0xff);       // max stream time limit
     497           0 :     bytestream_put_byte(&mms->write_out_ptr, 0x00);       // stream time limit flag
     498             : 
     499           0 :     mmst->packet_id++;                                     // new packet_id
     500           0 :     bytestream_put_le32(&mms->write_out_ptr, mmst->packet_id);
     501           0 :     return send_command_packet(mmst);
     502             : }
     503             : 
     504             : 
     505           0 : static void clear_stream_buffers(MMSContext *mms)
     506             : {
     507           0 :     mms->remaining_in_len = 0;
     508           0 :     mms->read_in_ptr      = mms->in_buffer;
     509           0 : }
     510             : 
     511           0 : static int mms_open(URLContext *h, const char *uri, int flags)
     512             : {
     513           0 :     MMSTContext *mmst = h->priv_data;
     514             :     MMSContext *mms;
     515             :     int port, err;
     516             :     char tcpname[256];
     517             : 
     518           0 :     h->is_streamed = 1;
     519           0 :     mms = &mmst->mms;
     520             : 
     521             :     // only for MMS over TCP, so set proto = NULL
     522           0 :     av_url_split(NULL, 0, NULL, 0,
     523           0 :             mmst->host, sizeof(mmst->host), &port, mmst->path,
     524             :             sizeof(mmst->path), uri);
     525             : 
     526           0 :     if(port<0)
     527           0 :         port = 1755; // default MMS protocol port
     528             : 
     529             :     // establish tcp connection.
     530           0 :     ff_url_join(tcpname, sizeof(tcpname), "tcp", NULL, mmst->host, port, NULL);
     531           0 :     err = ffurl_open_whitelist(&mms->mms_hd, tcpname, AVIO_FLAG_READ_WRITE,
     532           0 :                                &h->interrupt_callback, NULL,
     533             :                                h->protocol_whitelist, h->protocol_blacklist, h);
     534           0 :     if (err)
     535           0 :         goto fail;
     536             : 
     537           0 :     mmst->packet_id        = 3;          // default, initial value.
     538           0 :     mmst->header_packet_id = 2;          // default, initial value.
     539           0 :     err = mms_safe_send_recv(mmst, send_startup_packet, SC_PKT_CLIENT_ACCEPTED);
     540           0 :     if (err)
     541           0 :         goto fail;
     542           0 :     err = mms_safe_send_recv(mmst, send_time_test_data, SC_PKT_TIMING_TEST_REPLY);
     543           0 :     if (err)
     544           0 :         goto fail;
     545           0 :     err = mms_safe_send_recv(mmst, send_protocol_select, SC_PKT_PROTOCOL_ACCEPTED);
     546           0 :     if (err)
     547           0 :         goto fail;
     548           0 :     err = mms_safe_send_recv(mmst, send_media_file_request, SC_PKT_MEDIA_FILE_DETAILS);
     549           0 :     if (err)
     550           0 :         goto fail;
     551           0 :     err = mms_safe_send_recv(mmst, send_media_header_request, SC_PKT_HEADER_REQUEST_ACCEPTED);
     552           0 :     if (err)
     553           0 :         goto fail;
     554           0 :     err = mms_safe_send_recv(mmst, NULL, SC_PKT_ASF_HEADER);
     555           0 :     if (err)
     556           0 :         goto fail;
     557           0 :     if((mmst->incoming_flags != 0X08) && (mmst->incoming_flags != 0X0C)) {
     558           0 :         av_log(NULL, AV_LOG_ERROR,
     559             :                "The server does not support MMST (try MMSH or RTSP)\n");
     560           0 :         err = AVERROR(EINVAL);
     561           0 :         goto fail;
     562             :     }
     563           0 :     err = ff_mms_asf_header_parser(mms);
     564           0 :     if (err) {
     565           0 :         av_log(NULL, AV_LOG_TRACE, "asf header parsed failed!\n");
     566           0 :         goto fail;
     567             :     }
     568           0 :     mms->header_parsed = 1;
     569             : 
     570           0 :     if (!mms->asf_packet_len || !mms->stream_num)
     571             :         goto fail;
     572             : 
     573           0 :     clear_stream_buffers(mms);
     574           0 :     err = mms_safe_send_recv(mmst, send_stream_selection_request, SC_PKT_STREAM_ID_ACCEPTED);
     575           0 :     if (err)
     576           0 :         goto fail;
     577             :     // send media packet request
     578           0 :     err = mms_safe_send_recv(mmst, send_media_packet_request, SC_PKT_MEDIA_PKT_FOLLOWS);
     579           0 :     if (err) {
     580           0 :         goto fail;
     581             :     }
     582           0 :     av_log(NULL, AV_LOG_TRACE, "Leaving open (success)\n");
     583           0 :     return 0;
     584           0 : fail:
     585           0 :     mms_close(h);
     586           0 :     av_log(NULL, AV_LOG_TRACE, "Leaving open (failure: %d)\n", err);
     587           0 :     return err;
     588             : }
     589             : 
     590             : /** Read ASF data through the protocol. */
     591           0 : 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           0 :     MMSTContext *mmst = h->priv_data;
     595           0 :     MMSContext *mms   = &mmst->mms;
     596           0 :     int result = 0;
     597             : 
     598             :     do {
     599           0 :         if(mms->asf_header_read_size < mms->asf_header_size) {
     600             :             /* Read from ASF header buffer */
     601           0 :             result = ff_mms_read_header(mms, buf, size);
     602           0 :         } 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           0 :             result = ff_mms_read_data(mms, buf, size);
     606             :         } else {
     607             :             /* Read from network */
     608           0 :             int err = mms_safe_send_recv(mmst, NULL, SC_PKT_ASF_MEDIA);
     609           0 :             if (err == 0) {
     610           0 :                 if(mms->remaining_in_len>mms->asf_packet_len) {
     611           0 :                     av_log(NULL, AV_LOG_ERROR,
     612             :                            "Incoming pktlen %d is larger than ASF pktsize %d\n",
     613             :                            mms->remaining_in_len, mms->asf_packet_len);
     614           0 :                     result= AVERROR(EIO);
     615             :                 } else {
     616             :                     // copy the data to the packet buffer.
     617           0 :                     result = ff_mms_read_data(mms, buf, size);
     618           0 :                     if (result == 0) {
     619           0 :                         av_log(NULL, AV_LOG_TRACE, "Read ASF media packet size is zero!\n");
     620           0 :                         break;
     621             :                     }
     622             :                 }
     623             :             } else {
     624           0 :                 av_log(NULL, AV_LOG_TRACE, "read packet error!\n");
     625           0 :                 break;
     626             :             }
     627             :         }
     628           0 :     } while(!result); // only return one packet.
     629           0 :     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             : };

Generated by: LCOV version 1.13