LCOV - code coverage report
Current view: top level - libavformat - mmsh.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 0 212 0.0 %
Date: 2017-12-17 04:34:43 Functions: 0 10 0.0 %

          Line data    Source code
       1             : /*
       2             :  * MMS protocol over HTTP
       3             :  * Copyright (c) 2010 Zhentan Feng <spyfeng at gmail dot com>
       4             :  *
       5             :  * This file is part of FFmpeg.
       6             :  *
       7             :  * FFmpeg is free software; you can redistribute it and/or
       8             :  * modify it under the terms of the GNU Lesser General Public
       9             :  * License as published by the Free Software Foundation; either
      10             :  * version 2.1 of the License, or (at your option) any later version.
      11             :  *
      12             :  * FFmpeg is distributed in the hope that it will be useful,
      13             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      14             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      15             :  * Lesser General Public License for more details.
      16             :  *
      17             :  * You should have received a copy of the GNU Lesser General Public
      18             :  * License along with FFmpeg; if not, write to the Free Software
      19             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      20             :  */
      21             : 
      22             : /*
      23             :  * Reference
      24             :  * Windows Media HTTP Streaming Protocol.
      25             :  * http://msdn.microsoft.com/en-us/library/cc251059(PROT.10).aspx
      26             :  */
      27             : 
      28             : #include <string.h>
      29             : #include "libavutil/intreadwrite.h"
      30             : #include "libavutil/avstring.h"
      31             : #include "libavutil/opt.h"
      32             : #include "internal.h"
      33             : #include "mms.h"
      34             : #include "asf.h"
      35             : #include "http.h"
      36             : #include "url.h"
      37             : 
      38             : #define CHUNK_HEADER_LENGTH 4   // 2bytes chunk type and 2bytes chunk length.
      39             : #define EXT_HEADER_LENGTH   8   // 4bytes sequence, 2bytes useless and 2bytes chunk length.
      40             : 
      41             : // see Ref 2.2.1.8
      42             : #define USERAGENT  "User-Agent: NSPlayer/4.1.0.3856\r\n"
      43             : // see Ref 2.2.1.4.33
      44             : // the GUID value can be changed to any valid value.
      45             : #define CLIENTGUID "Pragma: xClientGUID={c77e7400-738a-11d2-9add-0020af0a3278}\r\n"
      46             : 
      47             : // see Ref 2.2.3 for packet type define:
      48             : // chunk type contains 2 fields: Frame and PacketID.
      49             : // Frame is 0x24 or 0xA4(rarely), different PacketID indicates different packet type.
      50             : typedef enum {
      51             :     CHUNK_TYPE_DATA          = 0x4424,
      52             :     CHUNK_TYPE_ASF_HEADER    = 0x4824,
      53             :     CHUNK_TYPE_END           = 0x4524,
      54             :     CHUNK_TYPE_STREAM_CHANGE = 0x4324,
      55             : } ChunkType;
      56             : 
      57             : typedef struct MMSHContext {
      58             :     MMSContext mms;
      59             :     uint8_t location[1024];
      60             :     int request_seq;  ///< request packet sequence
      61             :     int chunk_seq;    ///< data packet sequence
      62             : } MMSHContext;
      63             : 
      64           0 : static int mmsh_close(URLContext *h)
      65             : {
      66           0 :     MMSHContext *mmsh = (MMSHContext *)h->priv_data;
      67           0 :     MMSContext *mms   = &mmsh->mms;
      68           0 :     if (mms->mms_hd)
      69           0 :         ffurl_closep(&mms->mms_hd);
      70           0 :     av_freep(&mms->streams);
      71           0 :     av_freep(&mms->asf_header);
      72           0 :     return 0;
      73             : }
      74             : 
      75           0 : static ChunkType get_chunk_header(MMSHContext *mmsh, int *len)
      76             : {
      77           0 :     MMSContext *mms = &mmsh->mms;
      78             :     uint8_t chunk_header[CHUNK_HEADER_LENGTH];
      79             :     uint8_t ext_header[EXT_HEADER_LENGTH];
      80             :     ChunkType chunk_type;
      81             :     int chunk_len, res, ext_header_len;
      82             : 
      83           0 :     res = ffurl_read_complete(mms->mms_hd, chunk_header, CHUNK_HEADER_LENGTH);
      84           0 :     if (res != CHUNK_HEADER_LENGTH) {
      85           0 :         av_log(NULL, AV_LOG_ERROR, "Read data packet header failed!\n");
      86           0 :         return AVERROR(EIO);
      87             :     }
      88           0 :     chunk_type = AV_RL16(chunk_header);
      89           0 :     chunk_len  = AV_RL16(chunk_header + 2);
      90             : 
      91           0 :     switch (chunk_type) {
      92           0 :     case CHUNK_TYPE_END:
      93             :     case CHUNK_TYPE_STREAM_CHANGE:
      94           0 :         ext_header_len = 4;
      95           0 :         break;
      96           0 :     case CHUNK_TYPE_ASF_HEADER:
      97             :     case CHUNK_TYPE_DATA:
      98           0 :         ext_header_len = 8;
      99           0 :         break;
     100           0 :     default:
     101           0 :         av_log(NULL, AV_LOG_ERROR, "Strange chunk type %d\n", chunk_type);
     102           0 :         return AVERROR_INVALIDDATA;
     103             :     }
     104             : 
     105           0 :     res = ffurl_read_complete(mms->mms_hd, ext_header, ext_header_len);
     106           0 :     if (res != ext_header_len) {
     107           0 :         av_log(NULL, AV_LOG_ERROR, "Read ext header failed!\n");
     108           0 :         return AVERROR(EIO);
     109             :     }
     110           0 :     *len = chunk_len - ext_header_len;
     111           0 :     if (chunk_type == CHUNK_TYPE_END || chunk_type == CHUNK_TYPE_DATA)
     112           0 :         mmsh->chunk_seq = AV_RL32(ext_header);
     113           0 :     return chunk_type;
     114             : }
     115             : 
     116           0 : static int read_data_packet(MMSHContext *mmsh, const int len)
     117             : {
     118           0 :     MMSContext *mms   = &mmsh->mms;
     119             :     int res;
     120           0 :     if (len > sizeof(mms->in_buffer)) {
     121           0 :         av_log(NULL, AV_LOG_ERROR,
     122             :                "Data packet length %d exceeds the in_buffer size %"SIZE_SPECIFIER"\n",
     123             :                len, sizeof(mms->in_buffer));
     124           0 :         return AVERROR(EIO);
     125             :     }
     126           0 :     res = ffurl_read_complete(mms->mms_hd, mms->in_buffer, len);
     127           0 :     av_log(NULL, AV_LOG_TRACE, "Data packet len = %d\n", len);
     128           0 :     if (res != len) {
     129           0 :         av_log(NULL, AV_LOG_ERROR, "Read data packet failed!\n");
     130           0 :         return AVERROR(EIO);
     131             :     }
     132           0 :     if (len > mms->asf_packet_len) {
     133           0 :         av_log(NULL, AV_LOG_ERROR,
     134             :                "Chunk length %d exceed packet length %d\n",len, mms->asf_packet_len);
     135           0 :         return AVERROR_INVALIDDATA;
     136             :     } else {
     137           0 :         memset(mms->in_buffer + len, 0, mms->asf_packet_len - len); // padding
     138             :     }
     139           0 :     mms->read_in_ptr      = mms->in_buffer;
     140           0 :     mms->remaining_in_len = mms->asf_packet_len;
     141           0 :     return 0;
     142             : }
     143             : 
     144           0 : static int get_http_header_data(MMSHContext *mmsh)
     145             : {
     146           0 :     MMSContext *mms = &mmsh->mms;
     147             :     int res, len;
     148             :     ChunkType chunk_type;
     149             : 
     150             :     for (;;) {
     151           0 :         len = 0;
     152           0 :         res = chunk_type = get_chunk_header(mmsh, &len);
     153           0 :         if (res < 0) {
     154           0 :             return res;
     155           0 :         } else if (chunk_type == CHUNK_TYPE_ASF_HEADER){
     156             :             // get asf header and stored it
     157           0 :             if (!mms->header_parsed) {
     158           0 :                 if (mms->asf_header) {
     159           0 :                     if (len != mms->asf_header_size) {
     160           0 :                         mms->asf_header_size = len;
     161           0 :                         av_log(NULL, AV_LOG_TRACE, "Header len changed from %d to %d\n",
     162             :                                 mms->asf_header_size, len);
     163           0 :                         av_freep(&mms->asf_header);
     164             :                     }
     165             :                 }
     166           0 :                 mms->asf_header = av_mallocz(len);
     167           0 :                 if (!mms->asf_header) {
     168           0 :                     return AVERROR(ENOMEM);
     169             :                 }
     170           0 :                 mms->asf_header_size = len;
     171             :             }
     172           0 :             if (len > mms->asf_header_size) {
     173           0 :                 av_log(NULL, AV_LOG_ERROR,
     174             :                        "Asf header packet len = %d exceed the asf header buf size %d\n",
     175             :                        len, mms->asf_header_size);
     176           0 :                 return AVERROR(EIO);
     177             :             }
     178           0 :             res = ffurl_read_complete(mms->mms_hd, mms->asf_header, len);
     179           0 :             if (res != len) {
     180           0 :                 av_log(NULL, AV_LOG_ERROR,
     181             :                        "Recv asf header data len %d != expected len %d\n", res, len);
     182           0 :                 return AVERROR(EIO);
     183             :             }
     184           0 :             mms->asf_header_size = len;
     185           0 :             if (!mms->header_parsed) {
     186           0 :                 res = ff_mms_asf_header_parser(mms);
     187           0 :                 mms->header_parsed = 1;
     188           0 :                 return res;
     189             :             }
     190           0 :         } else if (chunk_type == CHUNK_TYPE_DATA) {
     191             :             // read data packet and do padding
     192           0 :             return read_data_packet(mmsh, len);
     193             :         } else {
     194           0 :             if (len) {
     195           0 :                 if (len > sizeof(mms->in_buffer)) {
     196           0 :                     av_log(NULL, AV_LOG_ERROR,
     197             :                            "Other packet len = %d exceed the in_buffer size %"SIZE_SPECIFIER"\n",
     198             :                            len, sizeof(mms->in_buffer));
     199           0 :                     return AVERROR(EIO);
     200             :                 }
     201           0 :                 res = ffurl_read_complete(mms->mms_hd, mms->in_buffer, len);
     202           0 :                 if (res != len) {
     203           0 :                     av_log(NULL, AV_LOG_ERROR, "Read other chunk type data failed!\n");
     204           0 :                     return AVERROR(EIO);
     205             :                 } else {
     206           0 :                     av_log(NULL, AV_LOG_TRACE, "Skip chunk type %d \n", chunk_type);
     207           0 :                     continue;
     208             :                 }
     209             :             }
     210             :         }
     211             :     }
     212             : }
     213             : 
     214           0 : static int mmsh_open_internal(URLContext *h, const char *uri, int flags, int timestamp, int64_t pos)
     215             : {
     216             :     int i, port, err;
     217             :     char httpname[256], path[256], host[128];
     218           0 :     char *stream_selection = NULL;
     219             :     char headers[1024];
     220           0 :     MMSHContext *mmsh = h->priv_data;
     221             :     MMSContext *mms;
     222             : 
     223           0 :     mmsh->request_seq = h->is_streamed = 1;
     224           0 :     mms = &mmsh->mms;
     225           0 :     av_strlcpy(mmsh->location, uri, sizeof(mmsh->location));
     226             : 
     227           0 :     av_url_split(NULL, 0, NULL, 0,
     228           0 :         host, sizeof(host), &port, path, sizeof(path), mmsh->location);
     229           0 :     if (port<0)
     230           0 :         port = 80; // default mmsh protocol port
     231           0 :     ff_url_join(httpname, sizeof(httpname), "http", NULL, host, port, "%s", path);
     232             : 
     233           0 :     if (ffurl_alloc(&mms->mms_hd, httpname, AVIO_FLAG_READ,
     234           0 :                     &h->interrupt_callback) < 0) {
     235           0 :         return AVERROR(EIO);
     236             :     }
     237             : 
     238           0 :     snprintf(headers, sizeof(headers),
     239             :              "Accept: */*\r\n"
     240             :              USERAGENT
     241             :              "Host: %s:%d\r\n"
     242             :              "Pragma: no-cache,rate=1.000000,stream-time=0,"
     243             :              "stream-offset=0:0,request-context=%u,max-duration=0\r\n"
     244             :              CLIENTGUID
     245             :              "Connection: Close\r\n",
     246           0 :              host, port, mmsh->request_seq++);
     247           0 :     av_opt_set(mms->mms_hd->priv_data, "headers", headers, 0);
     248             : 
     249           0 :     if (!mms->mms_hd->protocol_whitelist && h->protocol_whitelist) {
     250           0 :         mms->mms_hd->protocol_whitelist = av_strdup(h->protocol_whitelist);
     251           0 :         if (!mms->mms_hd->protocol_whitelist) {
     252           0 :             err = AVERROR(ENOMEM);
     253           0 :             goto fail;
     254             :         }
     255             :     }
     256             : 
     257           0 :     err = ffurl_connect(mms->mms_hd, NULL);
     258           0 :     if (err) {
     259           0 :         goto fail;
     260             :     }
     261           0 :     err = get_http_header_data(mmsh);
     262           0 :     if (err) {
     263           0 :         av_log(NULL, AV_LOG_ERROR, "Get http header data failed!\n");
     264           0 :         goto fail;
     265             :     }
     266             : 
     267             :     // close the socket and then reopen it for sending the second play request.
     268           0 :     ffurl_close(mms->mms_hd);
     269           0 :     memset(headers, 0, sizeof(headers));
     270           0 :     if ((err = ffurl_alloc(&mms->mms_hd, httpname, AVIO_FLAG_READ,
     271           0 :                            &h->interrupt_callback)) < 0) {
     272           0 :         goto fail;
     273             :     }
     274           0 :     stream_selection = av_mallocz(mms->stream_num * 19 + 1);
     275           0 :     if (!stream_selection)
     276           0 :         return AVERROR(ENOMEM);
     277           0 :     for (i = 0; i < mms->stream_num; i++) {
     278             :         char tmp[20];
     279           0 :         err = snprintf(tmp, sizeof(tmp), "ffff:%d:0 ", mms->streams[i].id);
     280           0 :         if (err < 0)
     281           0 :             goto fail;
     282           0 :         av_strlcat(stream_selection, tmp, mms->stream_num * 19 + 1);
     283             :     }
     284             :     // send play request
     285           0 :     err = snprintf(headers, sizeof(headers),
     286             :                    "Accept: */*\r\n"
     287             :                    USERAGENT
     288             :                    "Host: %s:%d\r\n"
     289             :                    "Pragma: no-cache,rate=1.000000,request-context=%u\r\n"
     290             :                    "Pragma: xPlayStrm=1\r\n"
     291             :                    CLIENTGUID
     292             :                    "Pragma: stream-switch-count=%d\r\n"
     293             :                    "Pragma: stream-switch-entry=%s\r\n"
     294             :                    "Pragma: no-cache,rate=1.000000,stream-time=%u"
     295             :                    "Connection: Close\r\n",
     296           0 :                    host, port, mmsh->request_seq++, mms->stream_num, stream_selection, timestamp);
     297           0 :     av_freep(&stream_selection);
     298           0 :     if (err < 0) {
     299           0 :         av_log(NULL, AV_LOG_ERROR, "Build play request failed!\n");
     300           0 :         goto fail;
     301             :     }
     302           0 :     av_log(NULL, AV_LOG_TRACE, "out_buffer is %s", headers);
     303           0 :     av_opt_set(mms->mms_hd->priv_data, "headers", headers, 0);
     304             : 
     305           0 :     err = ffurl_connect(mms->mms_hd, NULL);
     306           0 :     if (err) {
     307           0 :           goto fail;
     308             :     }
     309             : 
     310           0 :     err = get_http_header_data(mmsh);
     311           0 :     if (err) {
     312           0 :         av_log(NULL, AV_LOG_ERROR, "Get http header data failed!\n");
     313           0 :         goto fail;
     314             :     }
     315             : 
     316           0 :     av_log(NULL, AV_LOG_TRACE, "Connection successfully open\n");
     317           0 :     return 0;
     318           0 : fail:
     319           0 :     av_freep(&stream_selection);
     320           0 :     mmsh_close(h);
     321           0 :     av_log(NULL, AV_LOG_TRACE, "Connection failed with error %d\n", err);
     322           0 :     return err;
     323             : }
     324             : 
     325           0 : static int mmsh_open(URLContext *h, const char *uri, int flags)
     326             : {
     327           0 :     return mmsh_open_internal(h, uri, flags, 0, 0);
     328             : }
     329             : 
     330           0 : static int handle_chunk_type(MMSHContext *mmsh)
     331             : {
     332           0 :     MMSContext *mms = &mmsh->mms;
     333           0 :     int res, len = 0;
     334             :     ChunkType chunk_type;
     335           0 :     chunk_type = get_chunk_header(mmsh, &len);
     336             : 
     337           0 :     switch (chunk_type) {
     338           0 :     case CHUNK_TYPE_END:
     339           0 :         mmsh->chunk_seq = 0;
     340           0 :         av_log(NULL, AV_LOG_ERROR, "Stream ended!\n");
     341           0 :         return AVERROR(EIO);
     342           0 :     case CHUNK_TYPE_STREAM_CHANGE:
     343           0 :         mms->header_parsed = 0;
     344           0 :         if (res = get_http_header_data(mmsh)) {
     345           0 :             av_log(NULL, AV_LOG_ERROR,"Stream changed! Failed to get new header!\n");
     346           0 :             return res;
     347             :         }
     348           0 :         break;
     349           0 :     case CHUNK_TYPE_DATA:
     350           0 :         return read_data_packet(mmsh, len);
     351           0 :     default:
     352           0 :         av_log(NULL, AV_LOG_ERROR, "Recv other type packet %d\n", chunk_type);
     353           0 :         return AVERROR_INVALIDDATA;
     354             :     }
     355           0 :     return 0;
     356             : }
     357             : 
     358           0 : static int mmsh_read(URLContext *h, uint8_t *buf, int size)
     359             : {
     360           0 :     int res = 0;
     361           0 :     MMSHContext *mmsh = h->priv_data;
     362           0 :     MMSContext *mms   = &mmsh->mms;
     363             :     do {
     364           0 :         if (mms->asf_header_read_size < mms->asf_header_size) {
     365             :             // copy asf header into buffer
     366           0 :             res = ff_mms_read_header(mms, buf, size);
     367             :         } else {
     368           0 :             if (!mms->remaining_in_len && (res = handle_chunk_type(mmsh)))
     369           0 :                 return res;
     370           0 :             res = ff_mms_read_data(mms, buf, size);
     371             :         }
     372           0 :     } while (!res);
     373           0 :     return res;
     374             : }
     375             : 
     376           0 : static int64_t mmsh_read_seek(URLContext *h, int stream_index,
     377             :                         int64_t timestamp, int flags)
     378             : {
     379           0 :     MMSHContext *mmsh_old = h->priv_data;
     380           0 :     MMSHContext *mmsh     = av_mallocz(sizeof(*mmsh));
     381             :     int ret;
     382             : 
     383           0 :     if (!mmsh)
     384           0 :         return AVERROR(ENOMEM);
     385             : 
     386           0 :     h->priv_data = mmsh;
     387           0 :     ret= mmsh_open_internal(h, mmsh_old->location, 0, FFMAX(timestamp, 0), 0);
     388           0 :     if(ret>=0){
     389           0 :         h->priv_data = mmsh_old;
     390           0 :         mmsh_close(h);
     391           0 :         h->priv_data = mmsh;
     392           0 :         av_free(mmsh_old);
     393           0 :         mmsh->mms.asf_header_read_size = mmsh->mms.asf_header_size;
     394             :     }else {
     395           0 :         h->priv_data = mmsh_old;
     396           0 :         av_free(mmsh);
     397             :     }
     398             : 
     399           0 :     return ret;
     400             : }
     401             : 
     402           0 : static int64_t mmsh_seek(URLContext *h, int64_t pos, int whence)
     403             : {
     404           0 :     MMSHContext *mmsh = h->priv_data;
     405           0 :     MMSContext *mms   = &mmsh->mms;
     406             : 
     407           0 :     if(pos == 0 && whence == SEEK_CUR)
     408           0 :         return mms->asf_header_read_size + mms->remaining_in_len + mmsh->chunk_seq * (int64_t)mms->asf_packet_len;
     409           0 :     return AVERROR(ENOSYS);
     410             : }
     411             : 
     412             : const URLProtocol ff_mmsh_protocol = {
     413             :     .name           = "mmsh",
     414             :     .url_open       = mmsh_open,
     415             :     .url_read       = mmsh_read,
     416             :     .url_seek       = mmsh_seek,
     417             :     .url_close      = mmsh_close,
     418             :     .url_read_seek  = mmsh_read_seek,
     419             :     .priv_data_size = sizeof(MMSHContext),
     420             :     .flags          = URL_PROTOCOL_FLAG_NETWORK,
     421             :     .default_whitelist = "http,tcp",
     422             : };

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