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  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 {
  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. static int mmsh_close(URLContext *h)
  65. {
  66.     MMSHContext *mmsh = (MMSHContext *)h->priv_data;
  67.     MMSContext *mms   = &mmsh->mms;
  68.     if (mms->mms_hd)
  69.         ffurl_closep(&mms->mms_hd);
  70.     av_freep(&mms->streams);
  71.     av_freep(&mms->asf_header);
  72.     return 0;
  73. }
  74.  
  75. static ChunkType get_chunk_header(MMSHContext *mmsh, int *len)
  76. {
  77.     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.     res = ffurl_read_complete(mms->mms_hd, chunk_header, CHUNK_HEADER_LENGTH);
  84.     if (res != CHUNK_HEADER_LENGTH) {
  85.         av_log(NULL, AV_LOG_ERROR, "Read data packet header failed!\n");
  86.         return AVERROR(EIO);
  87.     }
  88.     chunk_type = AV_RL16(chunk_header);
  89.     chunk_len  = AV_RL16(chunk_header + 2);
  90.  
  91.     switch (chunk_type) {
  92.     case CHUNK_TYPE_END:
  93.     case CHUNK_TYPE_STREAM_CHANGE:
  94.         ext_header_len = 4;
  95.         break;
  96.     case CHUNK_TYPE_ASF_HEADER:
  97.     case CHUNK_TYPE_DATA:
  98.         ext_header_len = 8;
  99.         break;
  100.     default:
  101.         av_log(NULL, AV_LOG_ERROR, "Strange chunk type %d\n", chunk_type);
  102.         return AVERROR_INVALIDDATA;
  103.     }
  104.  
  105.     res = ffurl_read_complete(mms->mms_hd, ext_header, ext_header_len);
  106.     if (res != ext_header_len) {
  107.         av_log(NULL, AV_LOG_ERROR, "Read ext header failed!\n");
  108.         return AVERROR(EIO);
  109.     }
  110.     *len = chunk_len - ext_header_len;
  111.     if (chunk_type == CHUNK_TYPE_END || chunk_type == CHUNK_TYPE_DATA)
  112.         mmsh->chunk_seq = AV_RL32(ext_header);
  113.     return chunk_type;
  114. }
  115.  
  116. static int read_data_packet(MMSHContext *mmsh, const int len)
  117. {
  118.     MMSContext *mms   = &mmsh->mms;
  119.     int res;
  120.     if (len > sizeof(mms->in_buffer)) {
  121.         av_log(NULL, AV_LOG_ERROR,
  122.                "Data packet length %d exceeds the in_buffer size %zu\n",
  123.                len, sizeof(mms->in_buffer));
  124.         return AVERROR(EIO);
  125.     }
  126.     res = ffurl_read_complete(mms->mms_hd, mms->in_buffer, len);
  127.     av_dlog(NULL, "Data packet len = %d\n", len);
  128.     if (res != len) {
  129.         av_log(NULL, AV_LOG_ERROR, "Read data packet failed!\n");
  130.         return AVERROR(EIO);
  131.     }
  132.     if (len > mms->asf_packet_len) {
  133.         av_log(NULL, AV_LOG_ERROR,
  134.                "Chunk length %d exceed packet length %d\n",len, mms->asf_packet_len);
  135.         return AVERROR_INVALIDDATA;
  136.     } else {
  137.         memset(mms->in_buffer + len, 0, mms->asf_packet_len - len); // padding
  138.     }
  139.     mms->read_in_ptr      = mms->in_buffer;
  140.     mms->remaining_in_len = mms->asf_packet_len;
  141.     return 0;
  142. }
  143.  
  144. static int get_http_header_data(MMSHContext *mmsh)
  145. {
  146.     MMSContext *mms = &mmsh->mms;
  147.     int res, len;
  148.     ChunkType chunk_type;
  149.  
  150.     for (;;) {
  151.         len = 0;
  152.         res = chunk_type = get_chunk_header(mmsh, &len);
  153.         if (res < 0) {
  154.             return res;
  155.         } else if (chunk_type == CHUNK_TYPE_ASF_HEADER){
  156.             // get asf header and stored it
  157.             if (!mms->header_parsed) {
  158.                 if (mms->asf_header) {
  159.                     if (len != mms->asf_header_size) {
  160.                         mms->asf_header_size = len;
  161.                         av_dlog(NULL, "Header len changed from %d to %d\n",
  162.                                 mms->asf_header_size, len);
  163.                         av_freep(&mms->asf_header);
  164.                     }
  165.                 }
  166.                 mms->asf_header = av_mallocz(len);
  167.                 if (!mms->asf_header) {
  168.                     return AVERROR(ENOMEM);
  169.                 }
  170.                 mms->asf_header_size = len;
  171.             }
  172.             if (len > mms->asf_header_size) {
  173.                 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.                 return AVERROR(EIO);
  177.             }
  178.             res = ffurl_read_complete(mms->mms_hd, mms->asf_header, len);
  179.             if (res != len) {
  180.                 av_log(NULL, AV_LOG_ERROR,
  181.                        "Recv asf header data len %d != expected len %d\n", res, len);
  182.                 return AVERROR(EIO);
  183.             }
  184.             mms->asf_header_size = len;
  185.             if (!mms->header_parsed) {
  186.                 res = ff_mms_asf_header_parser(mms);
  187.                 mms->header_parsed = 1;
  188.                 return res;
  189.             }
  190.         } else if (chunk_type == CHUNK_TYPE_DATA) {
  191.             // read data packet and do padding
  192.             return read_data_packet(mmsh, len);
  193.         } else {
  194.             if (len) {
  195.                 if (len > sizeof(mms->in_buffer)) {
  196.                     av_log(NULL, AV_LOG_ERROR,
  197.                            "Other packet len = %d exceed the in_buffer size %zu\n",
  198.                            len, sizeof(mms->in_buffer));
  199.                     return AVERROR(EIO);
  200.                 }
  201.                 res = ffurl_read_complete(mms->mms_hd, mms->in_buffer, len);
  202.                 if (res != len) {
  203.                     av_log(NULL, AV_LOG_ERROR, "Read other chunk type data failed!\n");
  204.                     return AVERROR(EIO);
  205.                 } else {
  206.                     av_dlog(NULL, "Skip chunk type %d \n", chunk_type);
  207.                     continue;
  208.                 }
  209.             }
  210.         }
  211.     }
  212. }
  213.  
  214. 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.     char *stream_selection = NULL;
  219.     char headers[1024];
  220.     MMSHContext *mmsh = h->priv_data;
  221.     MMSContext *mms;
  222.  
  223.     mmsh->request_seq = h->is_streamed = 1;
  224.     mms = &mmsh->mms;
  225.     av_strlcpy(mmsh->location, uri, sizeof(mmsh->location));
  226.  
  227.     av_url_split(NULL, 0, NULL, 0,
  228.         host, sizeof(host), &port, path, sizeof(path), mmsh->location);
  229.     if (port<0)
  230.         port = 80; // default mmsh protocol port
  231.     ff_url_join(httpname, sizeof(httpname), "http", NULL, host, port, "%s", path);
  232.  
  233.     if (ffurl_alloc(&mms->mms_hd, httpname, AVIO_FLAG_READ,
  234.                     &h->interrupt_callback) < 0) {
  235.         return AVERROR(EIO);
  236.     }
  237.  
  238.     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.              host, port, mmsh->request_seq++);
  247.     av_opt_set(mms->mms_hd->priv_data, "headers", headers, 0);
  248.  
  249.     err = ffurl_connect(mms->mms_hd, NULL);
  250.     if (err) {
  251.         goto fail;
  252.     }
  253.     err = get_http_header_data(mmsh);
  254.     if (err) {
  255.         av_log(NULL, AV_LOG_ERROR, "Get http header data failed!\n");
  256.         goto fail;
  257.     }
  258.  
  259.     // close the socket and then reopen it for sending the second play request.
  260.     ffurl_close(mms->mms_hd);
  261.     memset(headers, 0, sizeof(headers));
  262.     if ((err = ffurl_alloc(&mms->mms_hd, httpname, AVIO_FLAG_READ,
  263.                            &h->interrupt_callback)) < 0) {
  264.         goto fail;
  265.     }
  266.     stream_selection = av_mallocz(mms->stream_num * 19 + 1);
  267.     if (!stream_selection)
  268.         return AVERROR(ENOMEM);
  269.     for (i = 0; i < mms->stream_num; i++) {
  270.         char tmp[20];
  271.         err = snprintf(tmp, sizeof(tmp), "ffff:%d:0 ", mms->streams[i].id);
  272.         if (err < 0)
  273.             goto fail;
  274.         av_strlcat(stream_selection, tmp, mms->stream_num * 19 + 1);
  275.     }
  276.     // send play request
  277.     err = snprintf(headers, sizeof(headers),
  278.                    "Accept: */*\r\n"
  279.                    USERAGENT
  280.                    "Host: %s:%d\r\n"
  281.                    "Pragma: no-cache,rate=1.000000,request-context=%u\r\n"
  282.                    "Pragma: xPlayStrm=1\r\n"
  283.                    CLIENTGUID
  284.                    "Pragma: stream-switch-count=%d\r\n"
  285.                    "Pragma: stream-switch-entry=%s\r\n"
  286.                    "Pragma: no-cache,rate=1.000000,stream-time=%u"
  287.                    "Connection: Close\r\n",
  288.                    host, port, mmsh->request_seq++, mms->stream_num, stream_selection, timestamp);
  289.     av_freep(&stream_selection);
  290.     if (err < 0) {
  291.         av_log(NULL, AV_LOG_ERROR, "Build play request failed!\n");
  292.         goto fail;
  293.     }
  294.     av_dlog(NULL, "out_buffer is %s", headers);
  295.     av_opt_set(mms->mms_hd->priv_data, "headers", headers, 0);
  296.  
  297.     err = ffurl_connect(mms->mms_hd, NULL);
  298.     if (err) {
  299.           goto fail;
  300.     }
  301.  
  302.     err = get_http_header_data(mmsh);
  303.     if (err) {
  304.         av_log(NULL, AV_LOG_ERROR, "Get http header data failed!\n");
  305.         goto fail;
  306.     }
  307.  
  308.     av_dlog(NULL, "Connection successfully open\n");
  309.     return 0;
  310. fail:
  311.     av_freep(&stream_selection);
  312.     mmsh_close(h);
  313.     av_dlog(NULL, "Connection failed with error %d\n", err);
  314.     return err;
  315. }
  316.  
  317. static int mmsh_open(URLContext *h, const char *uri, int flags)
  318. {
  319.     return mmsh_open_internal(h, uri, flags, 0, 0);
  320. }
  321.  
  322. static int handle_chunk_type(MMSHContext *mmsh)
  323. {
  324.     MMSContext *mms = &mmsh->mms;
  325.     int res, len = 0;
  326.     ChunkType chunk_type;
  327.     chunk_type = get_chunk_header(mmsh, &len);
  328.  
  329.     switch (chunk_type) {
  330.     case CHUNK_TYPE_END:
  331.         mmsh->chunk_seq = 0;
  332.         av_log(NULL, AV_LOG_ERROR, "Stream ended!\n");
  333.         return AVERROR(EIO);
  334.     case CHUNK_TYPE_STREAM_CHANGE:
  335.         mms->header_parsed = 0;
  336.         if (res = get_http_header_data(mmsh)) {
  337.             av_log(NULL, AV_LOG_ERROR,"Stream changed! Failed to get new header!\n");
  338.             return res;
  339.         }
  340.         break;
  341.     case CHUNK_TYPE_DATA:
  342.         return read_data_packet(mmsh, len);
  343.     default:
  344.         av_log(NULL, AV_LOG_ERROR, "Recv other type packet %d\n", chunk_type);
  345.         return AVERROR_INVALIDDATA;
  346.     }
  347.     return 0;
  348. }
  349.  
  350. static int mmsh_read(URLContext *h, uint8_t *buf, int size)
  351. {
  352.     int res = 0;
  353.     MMSHContext *mmsh = h->priv_data;
  354.     MMSContext *mms   = &mmsh->mms;
  355.     do {
  356.         if (mms->asf_header_read_size < mms->asf_header_size) {
  357.             // copy asf header into buffer
  358.             res = ff_mms_read_header(mms, buf, size);
  359.         } else {
  360.             if (!mms->remaining_in_len && (res = handle_chunk_type(mmsh)))
  361.                 return res;
  362.             res = ff_mms_read_data(mms, buf, size);
  363.         }
  364.     } while (!res);
  365.     return res;
  366. }
  367.  
  368. static int64_t mmsh_read_seek(URLContext *h, int stream_index,
  369.                         int64_t timestamp, int flags)
  370. {
  371.     MMSHContext *mmsh_old = h->priv_data;
  372.     MMSHContext *mmsh     = av_mallocz(sizeof(*mmsh));
  373.     int ret;
  374.  
  375.     if (!mmsh)
  376.         return AVERROR(ENOMEM);
  377.  
  378.     h->priv_data = mmsh;
  379.     ret= mmsh_open_internal(h, mmsh_old->location, 0, FFMAX(timestamp, 0), 0);
  380.     if(ret>=0){
  381.         h->priv_data = mmsh_old;
  382.         mmsh_close(h);
  383.         h->priv_data = mmsh;
  384.         av_free(mmsh_old);
  385.         mmsh->mms.asf_header_read_size = mmsh->mms.asf_header_size;
  386.     }else {
  387.         h->priv_data = mmsh_old;
  388.         av_free(mmsh);
  389.     }
  390.  
  391.     return ret;
  392. }
  393.  
  394. static int64_t mmsh_seek(URLContext *h, int64_t pos, int whence)
  395. {
  396.     MMSHContext *mmsh = h->priv_data;
  397.     MMSContext *mms   = &mmsh->mms;
  398.  
  399.     if(pos == 0 && whence == SEEK_CUR)
  400.         return mms->asf_header_read_size + mms->remaining_in_len + mmsh->chunk_seq * (int64_t)mms->asf_packet_len;
  401.     return AVERROR(ENOSYS);
  402. }
  403.  
  404. URLProtocol ff_mmsh_protocol = {
  405.     .name           = "mmsh",
  406.     .url_open       = mmsh_open,
  407.     .url_read       = mmsh_read,
  408.     .url_seek       = mmsh_seek,
  409.     .url_close      = mmsh_close,
  410.     .url_read_seek  = mmsh_read_seek,
  411.     .priv_data_size = sizeof(MMSHContext),
  412.     .flags          = URL_PROTOCOL_FLAG_NETWORK,
  413. };
  414.