path: root/plugins/mms/libmms/mmsh.c

/*
 * Copyright (C) 2002-2003 the xine project
 *
 * This file is part of xine, a free video player.
 *
 * xine is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * xine is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA
 *
 * $Id: mmsh.c,v 1.16 2007/12/11 20:50:43 jwrdegoede Exp $
 *
 * MMS over HTTP protocol
 *   written by Thibaut Mattern
 *   based on mms.c and specs from avifile
 *   (http://avifile.sourceforge.net/asf-1.0.htm)
 *
 * TODO:
 *   error messages
 *   http support cleanup, find a way to share code with input_http.c (http.h|c)
 *   http proxy support
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <stdlib.h>
#include <time.h>
#include <assert.h>

#define lprintf(...) if (getenv("LIBMMS_DEBUG")) fprintf(stderr, __VA_ARGS__)

/* cheat a bit and call ourselves mms.c to keep the code in mmsio.h clean */
#define __MMS_C__

#include "bswap.h"
#include "mmsh.h"
#include "asfheader.h"
#include "uri.h"
#include "mms-common.h"

/* #define USERAGENT "User-Agent: NSPlayer/7.1.0.3055\r\n" */
#define USERAGENT "User-Agent: NSPlayer/4.1.0.3856\r\n"
#define CLIENTGUID "Pragma: xClientGUID={c77e7400-738a-11d2-9add-0020af0a3278}\r\n"


#define MMSH_PORT                  80
#define MMSH_UNKNOWN                0
#define MMSH_SEEKABLE               1
#define MMSH_LIVE                   2

#define CHUNK_HEADER_LENGTH         4
#define EXT_HEADER_LENGTH           8
#define CHUNK_TYPE_RESET       0x4324
#define CHUNK_TYPE_DATA        0x4424
#define CHUNK_TYPE_END         0x4524
#define CHUNK_TYPE_ASF_HEADER  0x4824
#define CHUNK_SIZE              65536  /* max chunk size */
#define ASF_HEADER_SIZE     (8192 * 2)  /* max header size */

#define SCRATCH_SIZE             1024

#define SUCCESS 0
#define ERROR 1
#define EOS 2
#define GOT_HEADER_N_DATA 3

static const char* mmsh_FirstRequest =
    "GET %s HTTP/1.0\r\n"
    "Accept: */*\r\n"
    USERAGENT
    "Host: %s:%d\r\n"
    "Pragma: no-cache,rate=1.000000,stream-time=0,stream-offset=0:0,request-context=%u,max-duration=0\r\n"
    CLIENTGUID
    "Connection: Close\r\n\r\n";

static const char* mmsh_SeekableRequest =
    "GET %s HTTP/1.0\r\n"
    "Accept: */*\r\n"
    USERAGENT
    "Host: %s:%d\r\n"
    "Pragma: no-cache,rate=1.000000,stream-time=%u,stream-offset=%u:%u,request-context=%u,max-duration=%u\r\n"
    CLIENTGUID
    "Pragma: xPlayStrm=1\r\n"
    "Pragma: stream-switch-count=%d\r\n"
    "Pragma: stream-switch-entry=%s\r\n" /*  ffff:1:0 ffff:2:0 */
    "Connection: Close\r\n\r\n";

static const char* mmsh_LiveRequest =
    "GET %s HTTP/1.0\r\n"
    "Accept: */*\r\n"
    USERAGENT
    "Host: %s:%d\r\n"
    "Pragma: no-cache,rate=1.000000,request-context=%u\r\n"
    "Pragma: xPlayStrm=1\r\n"
    CLIENTGUID
    "Pragma: stream-switch-count=%d\r\n"
    "Pragma: stream-switch-entry=%s\r\n"
    "Connection: Close\r\n\r\n";


#if 0
/* Unused requests */
static const char* mmsh_PostRequest =
    "POST %s HTTP/1.0\r\n"
    "Accept: */*\r\n"
    USERAGENT
    "Host: %s\r\n"
    "Pragma: client-id=%u\r\n"
/*    "Pragma: log-line=no-cache,rate=1.000000,stream-time=%u,stream-offset=%u:%u,request-context=2,max-duration=%u\r\n" */
    "Pragma: Content-Length: 0\r\n"
    CLIENTGUID
    "\r\n";

static const char* mmsh_RangeRequest =
    "GET %s HTTP/1.0\r\n"
    "Accept: */*\r\n"
    USERAGENT
    "Host: %s:%d\r\n"
    "Range: bytes=%Lu-\r\n"
    CLIENTGUID
    "Connection: Close\r\n\r\n";
#endif



/* 
 * mmsh specific types 
 */


struct mmsh_s {

  int           s;

  /* url parsing */
  char         *url;
  char         *proxy_url;
  char         *proto;
  char         *connect_host;
  int           connect_port;
  char         *http_host;
  int           http_port;
  int           http_request_number;
  char         *proxy_user;
  char         *proxy_password;
  char         *host_user;
  char         *host_password;
  char         *uri;

  char          str[SCRATCH_SIZE]; /* scratch buffer to built strings */

  int           stream_type;  /* seekable or broadcast */
  
  /* receive buffer */
  
  /* chunk */
  uint16_t      chunk_type;
  uint16_t      chunk_length;
  uint32_t      chunk_seq_number;
  uint8_t       buf[CHUNK_SIZE];

  int           buf_size;
  int           buf_read;

  uint8_t       asf_header[ASF_HEADER_SIZE];
  uint32_t      asf_header_len;
  uint32_t      asf_header_read;
  int           num_stream_ids;
  mms_stream_t  streams[ASF_MAX_NUM_STREAMS];
  uint32_t      packet_length;
  int64_t       file_length;
  uint64_t      time_len; /* playback time in 100 nanosecs (10^-7) */
  uint64_t      preroll;
  uint64_t      asf_num_packets;
  char          guid[37];

  int           has_audio;
  int           has_video;
  int           seekable;

  off_t         current_pos;
  int           user_bandwidth;

  int *need_abort;
};

static int fallback_io_select(void *data, int socket, int state, int timeout_msec)
{
  fd_set set;
  struct timeval tv = { timeout_msec / 1000, (timeout_msec % 1000) * 1000};
  FD_ZERO(&set);
  FD_SET(socket, &set);
  return select(1, (state == MMS_IO_READ_READY) ? &set : NULL,
                   (state == MMS_IO_WRITE_READY) ? &set : NULL, NULL, &tv);
}

static off_t fallback_io_read(void *data, int socket, char *buf, off_t num, int *need_abort)
{
  off_t len = 0, ret;
/*   lprintf("%d\n", fallback_io_select(data, socket, MMS_IO_READ_READY, 1000)); */
  errno = 0;
  while (len < num)
  {
    ret = (off_t)read(socket, buf + len, num - len);
    if(ret == 0)
      break; /* EOS */
    if(ret < 0) {
      lprintf("mmsh: read error @ len = %lld: %s\n", (long long int) len,
              strerror(errno));
      switch(errno)
      {
          case EAGAIN:
            continue;
          default:
            /* if already read something, return it, we will fail next time */
            return len ? len : ret; 
      }
    }
    len += ret;
  }
  return len;
}

static off_t fallback_io_write(void *data, int socket, char *buf, off_t num)
{
  return (off_t)write(socket, buf, num);
}

static int fallback_io_tcp_connect(void *data, const char *host, int port)
{
  
  struct hostent *h;
  int i, s;
  
  h = gethostbyname(host);
  if (h == NULL) {
    lprintf("mmsh: unable to resolve host: %s\n", host);
    return -1;
  }

  s = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);  
  if (s == -1) {
    lprintf("mmsh: failed to create socket: %s\n", strerror(errno));
    return -1;
  }

  if (fcntl (s, F_SETFL, fcntl (s, F_GETFL) & ~O_NONBLOCK) == -1) {
    lprintf("mmsh: failed to set socket flags: %s\n", strerror(errno));
    return -1;
  }

  for (i = 0; h->h_addr_list[i]; i++) {
    struct in_addr ia;
    struct sockaddr_in sin;
 
    memcpy (&ia, h->h_addr_list[i], 4);
    sin.sin_family = AF_INET;
    sin.sin_addr   = ia;
    sin.sin_port   = htons(port);
    
    if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) ==-1 && errno != EINPROGRESS) {
      continue;
    }
    
    return s;
  }
  close(s);
  return -1;
}


static mms_io_t fallback_io =
  {
    &fallback_io_select,
    NULL,
    &fallback_io_read,
    NULL,
    &fallback_io_write,
    NULL,
    &fallback_io_tcp_connect,
    NULL,
  };

static mms_io_t default_io =   {
    &fallback_io_select,
    NULL,
    &fallback_io_read,
    NULL,
    &fallback_io_write,
    NULL,
    &fallback_io_tcp_connect,
    NULL,
  };


#define io_read(io, args...) ((io) ? (io)->read(io->read_data , ## args) : default_io.read(NULL , ## args))
#define io_write(io, args...) ((io) ? (io)->write(io->write_data , ## args) : default_io.write(NULL , ## args))
#define io_select(io, args...) ((io) ? (io)->select(io->select_data , ## args) : default_io.select(NULL , ## args))
#define io_connect(io, args...) ((io) ? (io)->connect(io->connect_data , ## args) : default_io.connect(NULL , ## args))
  
static int get_guid (unsigned char *buffer, int offset) {
  int i;
  GUID g;
  
  g.Data1 = LE_32(buffer + offset);
  g.Data2 = LE_16(buffer + offset + 4);
  g.Data3 = LE_16(buffer + offset + 6);
  for(i = 0; i < 8; i++) {
    g.Data4[i] = buffer[offset + 8 + i];
  }
  
  for (i = 1; i < GUID_END; i++) {
    if (!memcmp(&g, &guids[i].guid, sizeof(GUID))) {
      lprintf("mmsh: GUID: %s\n", guids[i].name);
      return i;
    }
  }

  lprintf("mmsh: unknown GUID: 0x%x, 0x%x, 0x%x, "
          "{ 0x%hx, 0x%hx, 0x%hx, 0x%hx, 0x%hx, 0x%hx, 0x%hx, 0x%hx }\n",
          g.Data1, g.Data2, g.Data3,
          g.Data4[0], g.Data4[1], g.Data4[2], g.Data4[3], 
          g.Data4[4], g.Data4[5], g.Data4[6], g.Data4[7]);
  return GUID_ERROR;
}

static int send_command (mms_io_t *io, mmsh_t *this, char *cmd)  {
  int length;

  lprintf("mmsh: send_command:\n%s\n", cmd);

  length = strlen(cmd);
  if (io_write(io, this->s, cmd, length) != length) {
    lprintf ("mmsh: send error.\n");
    return 0;
  }
  return 1;
}

static int get_answer (mms_io_t *io, mmsh_t *this) {
 
  int done, len, linenum;
  char *features;

  done = 0; len = 0; linenum = 0;
  this->stream_type = MMSH_UNKNOWN;

  while (!done) {

    if (io_read(io, this->s, &(this->buf[len]), 1, this->need_abort) != 1) {
      lprintf ("mmsh: alart: end of stream\n");
      return 0;
    }

    if (this->buf[len] == '\012') {

      this->buf[len] = '\0';
      len--;
      
      if ((len >= 0) && (this->buf[len] == '\015')) {
        this->buf[len] = '\0';
        len--;
      }

      linenum++;
      
      lprintf("mmsh: answer: >%s<\n", this->buf);

      if (linenum == 1) {
        int httpver, httpsub, httpcode;
        char httpstatus[51];

        if (sscanf(this->buf, "HTTP/%d.%d %d %50[^\015\012]", &httpver, &httpsub,
            &httpcode, httpstatus) != 4) {
          lprintf ("mmsh: bad response format\n");
          return 0;
        }

        if (httpcode >= 300 && httpcode < 400) {
          lprintf ("mmsh: 3xx redirection not implemented: >%d %s<\n", httpcode, httpstatus);
          return 0;
        }

        if (httpcode < 200 || httpcode >= 300) {
          lprintf ("mmsh: http status not 2xx: >%d %s<\n", httpcode, httpstatus);
          return 0;
        }
      } else {

        if (!strncasecmp(this->buf, "Location: ", 10)) {
          lprintf ("mmsh: Location redirection not implemented.\n");
          return 0;
        }
        
        if (!strncasecmp(this->buf, "Pragma:", 7)) {
          features = strstr(this->buf + 7, "features=");
          if (features) {
            if (strstr(features, "seekable")) {
              lprintf("mmsh: seekable stream\n");
              this->stream_type = MMSH_SEEKABLE;
              this->seekable = 1;
            } else {
              if (strstr(features, "broadcast")) {
                lprintf("mmsh: live stream\n");
                this->stream_type = MMSH_LIVE;
                this->seekable = 0;
              }
            }
          }
        }
      }
      
      if (len == -1) {
        done = 1;
      } else {
        len = 0;
      }
    } else {
      len ++;
    }
  }
  if (this->stream_type == MMSH_UNKNOWN) {
    lprintf ("mmsh: unknown stream type\n");
    this->stream_type = MMSH_SEEKABLE; /* FIXME ? */
    this->seekable = 1;
  }
  return 1;
}

static int get_chunk_header (mms_io_t *io, mmsh_t *this) {
  uint8_t chunk_header[CHUNK_HEADER_LENGTH];
  uint8_t ext_header[EXT_HEADER_LENGTH];
  int read_len;
  int ext_header_len;

  /* read chunk header */
  read_len = io_read(io, this->s, chunk_header, CHUNK_HEADER_LENGTH, this->need_abort);
  if (read_len != CHUNK_HEADER_LENGTH) {
    if (read_len == 0)
      return EOS;
    lprintf("mmsh: chunk header read failed, %d != %d\n", read_len, CHUNK_HEADER_LENGTH);
    return ERROR;
  }
  this->chunk_type       = LE_16 (&chunk_header[0]);
  this->chunk_length     = LE_16 (&chunk_header[2]);

  switch (this->chunk_type) {
    case CHUNK_TYPE_DATA:
      ext_header_len = 8;
      break;
    case CHUNK_TYPE_END:
      ext_header_len = 4;
      break;
    case CHUNK_TYPE_ASF_HEADER:
      ext_header_len = 8;
      break;
    case CHUNK_TYPE_RESET:
      ext_header_len = 4;
      break;
    default:
      ext_header_len = 0;
  }
  /* read extended header */
  if (ext_header_len > 0) {
    read_len = io_read (io, this->s, ext_header, ext_header_len, this->need_abort);
    if (read_len != ext_header_len) {
      lprintf("mmsh: extended header read failed. %d != %d\n", read_len, ext_header_len);
      return ERROR;
    }
  }
  
  if (this->chunk_type == CHUNK_TYPE_DATA || this->chunk_type == CHUNK_TYPE_END)
    this->chunk_seq_number = LE_32 (&ext_header[0]);

  /* display debug infos */
#ifdef DEBUG
  switch (this->chunk_type) {
    case CHUNK_TYPE_DATA:
      lprintf ("chunk type:       CHUNK_TYPE_DATA\n");
      lprintf ("chunk length:     %d\n", this->chunk_length);
      lprintf ("chunk seq:        %d\n", this->chunk_seq_number);
      lprintf ("unknown:          %d\n", ext_header[4]);
      lprintf ("mmsh seq:         %d\n", ext_header[5]);
      lprintf ("len2:             %d\n", LE_16(&ext_header[6]));
      break;
    case CHUNK_TYPE_END:
      lprintf ("chunk type:       CHUNK_TYPE_END\n");
      lprintf ("continue: %d\n", this->chunk_seq_number);
      break;
    case CHUNK_TYPE_ASF_HEADER:
      lprintf ("chunk type:       CHUNK_TYPE_ASF_HEADER\n");
      lprintf ("chunk length:     %d\n", this->chunk_length);
      lprintf ("unknown:          %2X %2X %2X %2X %2X %2X\n",
               ext_header[0], ext_header[1], ext_header[2], ext_header[3],
               ext_header[4], ext_header[5]);
      lprintf ("len2:             %d\n", LE_16(&ext_header[6]));
      break;
    case CHUNK_TYPE_RESET:
      lprintf ("chunk type:       CHUNK_TYPE_RESET\n");
      lprintf ("chunk seq:        %d\n", this->chunk_seq_number);
      lprintf ("unknown:          %2X %2X %2X %2X\n",
               ext_header[0], ext_header[1], ext_header[2], ext_header[3]);
      break;
    default:
      lprintf ("unknown chunk:    %4X\n", this->chunk_type);
  }
#endif

  this->chunk_length -= ext_header_len;
  return SUCCESS;
}

static int get_header (mms_io_t *io, mmsh_t *this) {
  int ret, len = 0;

  this->asf_header_len = 0;
  this->asf_header_read = 0;
  this->buf_size = 0;

  /* read chunk */
  while (1) {
    if ((ret = get_chunk_header(io, this)) == SUCCESS) {
      if (this->chunk_type == CHUNK_TYPE_ASF_HEADER) {
        if ((this->asf_header_len + this->chunk_length) > ASF_HEADER_SIZE) {
          lprintf ("mmsh: the asf header exceed %d bytes\n", ASF_HEADER_SIZE);
          return ERROR;
        } else {
          len = io_read(io, this->s, this->asf_header + this->asf_header_len,
                        this->chunk_length, this->need_abort);
          if (len > 0)
            this->asf_header_len += len;
          if (len != this->chunk_length) {
            lprintf ("mmsh: asf header chunk read failed, %d != %d\n", len,
                     this->chunk_length);
            return ERROR;
          }
        }
      } else {
        break;
      }
    } else {
      if (this->asf_header_len == 0 || ret != EOS)
        lprintf("mmsh: get_header failed to get chunk header\n");
      return ret;
    }
  }

  if (this->chunk_type == CHUNK_TYPE_DATA) {
    /* read the first data chunk */
    len = io_read (io, this->s, this->buf, this->chunk_length, this->need_abort);

    if (len != this->chunk_length) {
      lprintf ("mmsh: asf data chunk read failed, %d != %d\n", len,
               this->chunk_length);
      return ERROR;
    } else {
      /* check and 0 pad the first data chunk */
      if (this->chunk_length > this->packet_length) {
        lprintf ("mmsh: chunk_length(%d) > packet_length(%d)\n",
                 this->chunk_length, this->packet_length);
        return ERROR;
      }

      /* explicit padding with 0 */
      if (this->chunk_length < this->packet_length)
        memset(this->buf + this->chunk_length, 0,
               this->packet_length - this->chunk_length);

      this->buf_size = this->packet_length;

      return SUCCESS;
    }
  } else {
    /* unexpected packet type */
    lprintf ("mmsh: unexpected chunk_type(0x%04x)\n", this->chunk_type);
    return ERROR;
  }
}

static void interp_stream_properties(mmsh_t *this, int i) {
  uint16_t flags;
  uint16_t stream_id;
  int      type;
  int      encrypted;
  int      guid;

  guid = get_guid(this->asf_header, i);
  switch (guid) {
    case GUID_ASF_AUDIO_MEDIA:
      type = ASF_STREAM_TYPE_AUDIO;
      this->has_audio = 1;
      break;

    case GUID_ASF_VIDEO_MEDIA:
    case GUID_ASF_JFIF_MEDIA:
    case GUID_ASF_DEGRADABLE_JPEG_MEDIA:
      type = ASF_STREAM_TYPE_VIDEO;
      this->has_video = 1;
      break;

    case GUID_ASF_COMMAND_MEDIA:
      type = ASF_STREAM_TYPE_CONTROL;
      break;

    default:
      type = ASF_STREAM_TYPE_UNKNOWN;
  }

  flags = LE_16(this->asf_header + i + 48);
  stream_id = flags & 0x7F;
  encrypted = flags >> 15;

  lprintf("mmsh: stream object, stream id: %d, type: %d, encrypted: %d\n",
          stream_id, type, encrypted);

  if (this->num_stream_ids >= ASF_MAX_NUM_STREAMS) {
    lprintf("mmsh: too many streams, skipping\n");
    return;
  }

  this->streams[this->num_stream_ids].stream_type = type;
  this->streams[this->num_stream_ids].stream_id = stream_id;
  this->num_stream_ids++;
}

static void interp_header (mms_io_t *io, mmsh_t *this) {

  int i;

  this->packet_length = 0;
  this->num_stream_ids = 0;
  this->asf_num_packets = 0;

  /*
   * parse asf header
   */

  i = 30;
  while ((i + 24) <= this->asf_header_len) {

    int guid;
    uint64_t length;

    guid = get_guid(this->asf_header, i);
    length = LE_64(this->asf_header + i + 16);

    if ((i + length) > this->asf_header_len) return;

    switch (guid) {

      case GUID_ASF_FILE_PROPERTIES:

        this->packet_length = LE_32(this->asf_header + i + 92);
        if (this->packet_length > CHUNK_SIZE) {
          this->packet_length = 0;
          break;
        }
        this->file_length   = LE_64(this->asf_header + i + 40);
        this->time_len       = LE_64(this->asf_header + i + 64);
        //this->time_len       = LE_64(this->asf_header + i + 72);
        this->preroll        = LE_64(this->asf_header + i + 80);
        lprintf("mmsh: file object, packet length = %d (%d)\n",
                this->packet_length, LE_32(this->asf_header + i + 96));
        break;

      case GUID_ASF_STREAM_PROPERTIES:
        interp_stream_properties(this, i + 24);
        break;

      case GUID_ASF_STREAM_BITRATE_PROPERTIES:
        {
          uint16_t streams = LE_16(this->asf_header + i + 24);
          uint16_t stream_id;
          int j, stream_index;

          for(j = 0; j < streams; j++) {
            stream_id = LE_16(this->asf_header + i + 24 + 2 + j * 6);

            for(stream_index = 0; stream_index < this->num_stream_ids; stream_index++) {
              if (this->streams[stream_index].stream_id == stream_id)
                break;
            }
            if (stream_index < this->num_stream_ids) {
              this->streams[stream_index].bitrate = LE_32(this->asf_header + i + 24 + 4 + j * 6);
              this->streams[stream_index].bitrate_pos = i + 24 + 4 + j * 6;
              lprintf ("mmsh: stream id %d, bitrate %d\n", stream_id, 
                       this->streams[stream_index].bitrate);
            } else
              lprintf ("mmsh: unknown stream id %d in bitrate properties\n",
                       stream_id);
          }
        }
        break;

      case GUID_ASF_HEADER_EXTENSION:
        {
          if ((24 + 18 + 4) > length)
            break;

          int size = LE_32(this->asf_header + i + 24 + 18);
          int j = 24 + 18 + 4;
          int l;
          lprintf("mmsh: Extension header data size: %d\n", size);

          while ((j + 24) <= length) {
            guid = get_guid(this->asf_header, i + j);
            l = LE_64(this->asf_header + i + j + 16);

            if ((j + l) > length)
              break;

            if (guid == GUID_ASF_EXTENDED_STREAM_PROPERTIES &&
                (24 + 64) <= l) {
                  int stream_no = LE_16(this->asf_header + i + j + 24 + 48);
                  int name_count = LE_16(this->asf_header + i + j + 24 + 60);
                  int ext_count = LE_16(this->asf_header + i + j + 24 + 62);
                  int ext_j = 24 + 64;
                  int x;

                  lprintf("mmsh: l: %d\n", l);
                  lprintf("mmsh: Stream No: %d\n", stream_no);
                  lprintf("mmsh: ext_count: %d\n", ext_count);

                  // Loop through the number of stream names
                  for (x = 0; x < name_count && (ext_j + 4) <= l; x++) {
                    int lang_id_index;
                    int stream_name_len;

                    lang_id_index = LE_16(this->asf_header + i + j + ext_j);
                    ext_j += 2;

                    stream_name_len = LE_16(this->asf_header + i + j + ext_j);
                    ext_j += stream_name_len + 2;

                    lprintf("mmsh: Language id index: %d\n", lang_id_index);
                    lprintf("mmsh: Stream name Len: %d\n", stream_name_len);
                  }

                  // Loop through the number of extension system info
                  for (x = 0; x < ext_count && (ext_j + 22) <= l; x++) {
                    ext_j += 18;
                    int len = LE_16(this->asf_header + i + j + ext_j);
                    ext_j += 4 + len;
                  }

                  lprintf("mmsh: ext_j: %d\n", ext_j);
                  // Finally, we arrive at the interesting point: The optional Stream Property Object
                  if ((ext_j + 24) <= l) {
                    guid = get_guid(this->asf_header, i + j + ext_j);
                    int len = LE_64(this->asf_header + i + j + ext_j + 16);
                    if (guid == GUID_ASF_STREAM_PROPERTIES &&
                        (ext_j + len) <= l) {
                      interp_stream_properties(this, i + j + ext_j + 24);
                    }
                  } else {
                    lprintf("mmsh: Sorry, field not long enough\n");
                  }
            }
            j += l;
          }
        }
        break;

      case GUID_ASF_DATA:
        this->asf_num_packets = LE_64(this->asf_header + i + 40 - 24);
        lprintf("mmsh: num_packets: %d\n", (int)this->asf_num_packets);
        break;
    }

    lprintf("mmsh: length: %llu\n", (unsigned long long)length);
    i += length;
  }
}

const static char *const mmsh_proto_s[] = { "mms", "mmsh", NULL };

static int mmsh_valid_proto (char *proto) {
  int i = 0;

  if (!proto)
    return 0;

  while(mmsh_proto_s[i]) {
    if (!strcasecmp(proto, mmsh_proto_s[i])) {
      return 1;
    }
    i++;
  }
  return 0;
}

/*
 * returns 1 on error
 */
static int mmsh_tcp_connect(mms_io_t *io, mmsh_t *this) {
  if (!this->connect_port) this->connect_port = MMSH_PORT;
  
  /* 
   * try to connect 
   */
  lprintf("mmsh: try to connect to %s on port %d \n", this->connect_host, this->connect_port);

  this->s = io_connect (io, this->connect_host, this->connect_port);

  if (this->s == -1) {
    lprintf("mmsh: failed to connect '%s'\n", this->connect_host);
    return 1;
  }

  lprintf("mmsh: connected\n");

  return 0;
}

static int mmsh_connect_int (mms_io_t *io, mmsh_t *this, off_t seek, uint32_t time_seek) {
  int    i;
  int    video_stream = -1;
  int    audio_stream = -1;
  int    max_arate    = -1;
  int    min_vrate    = -1;
  int    min_bw_left  = 0;
  int    bandwitdh_left;
  char   stream_selection[10 * ASF_MAX_NUM_STREAMS]; /* 10 chars per stream */
  int    offset;
  
  /* Close exisiting connection (if any) and connect */
  if (this->s != -1)
    close(this->s);

  if (mmsh_tcp_connect(io, this)) {
    return 0;
  }

  /*
   * let the negotiations begin...
   */
  this->num_stream_ids = 0;

  /* first request */
  lprintf("mmsh: first http request\n");
  
  snprintf (this->str, SCRATCH_SIZE, mmsh_FirstRequest, this->uri,
            this->http_host, this->http_port, this->http_request_number++);

  if (!send_command (io, this, this->str))
    goto fail;

  if (!get_answer (io, this))
    goto fail;

  /* Don't check for != SUCCESS as EOS is normal here too */    
  if (get_header(io, this) == ERROR)
    goto fail;

  interp_header(io, this);
  if (!this->packet_length || !this->num_stream_ids)
    goto fail;
  
  close(this->s);
  
  /* choose the best quality for the audio stream */
  /* i've never seen more than one audio stream */
  for (i = 0; i < this->num_stream_ids; i++) {
    switch (this->streams[i].stream_type) {
      case ASF_STREAM_TYPE_AUDIO:
        if ((audio_stream == -1) || (this->streams[i].bitrate > max_arate)) {
          audio_stream = this->streams[i].stream_id;
          max_arate = this->streams[i].bitrate;
        }
        break;
      default:
        break;
    }
  }

  /* choose a video stream adapted to the user bandwidth */
  bandwitdh_left = this->user_bandwidth - max_arate;
  if (bandwitdh_left < 0) {
    bandwitdh_left = 0;
  }
  lprintf("mmsh: bandwitdh %d, left %d\n", this->user_bandwidth, bandwitdh_left);

  min_bw_left = bandwitdh_left;
  for (i = 0; i < this->num_stream_ids; i++) {
    switch (this->streams[i].stream_type) {
      case ASF_STREAM_TYPE_VIDEO:
        if (((bandwitdh_left - this->streams[i].bitrate) < min_bw_left) &&
            (bandwitdh_left >= this->streams[i].bitrate)) {
          video_stream = this->streams[i].stream_id;
          min_bw_left = bandwitdh_left - this->streams[i].bitrate;
        }
        break;
      default:
        break;
    }
  }  

  /* choose the stream with the lower bitrate */
  if ((video_stream == -1) && this->has_video) {
    for (i = 0; i < this->num_stream_ids; i++) {
    switch (this->streams[i].stream_type) {
        case ASF_STREAM_TYPE_VIDEO:
          if ((video_stream == -1) || 
              (this->streams[i].bitrate < min_vrate) ||
              (!min_vrate)) {
            video_stream = this->streams[i].stream_id;
            min_vrate = this->streams[i].bitrate;
          }
          break;
        default:
          break;
      }
    }
  }

  lprintf("mmsh: audio stream %d, video stream %d\n", audio_stream, video_stream);
  
  /* second request */
  lprintf("mmsh: second http request\n");

  if (mmsh_tcp_connect(io, this)) {
    return 0;
  }

  /* stream selection string */
  /* The same selection is done with mmst */
  /* 0 means selected */
  /* 2 means disabled */
  offset = 0;
  for (i = 0; i < this->num_stream_ids; i++) {
    int size;
    if ((this->streams[i].stream_id == audio_stream) ||
        (this->streams[i].stream_id == video_stream)) {
      size = snprintf(stream_selection + offset, sizeof(stream_selection) - offset,
                      "ffff:%d:0 ", this->streams[i].stream_id);
    } else {
      lprintf("mmsh: disabling stream %d\n", this->streams[i].stream_id);
      size = snprintf(stream_selection + offset, sizeof(stream_selection) - offset,
                      "ffff:%d:2 ", this->streams[i].stream_id);
    }
    if (size < 0) goto fail;
    offset += size;
  }

  switch (this->stream_type) {
    case MMSH_SEEKABLE:
      snprintf (this->str, SCRATCH_SIZE, mmsh_SeekableRequest, this->uri,
                this->http_host, this->http_port, time_seek,
                (unsigned int)(seek >> 32),
                (unsigned int)seek, this->http_request_number++, 0,
                this->num_stream_ids, stream_selection);
      break;
    case MMSH_LIVE:
      snprintf (this->str, SCRATCH_SIZE, mmsh_LiveRequest, this->uri,
                this->http_host, this->http_port, this->http_request_number++,
                this->num_stream_ids, stream_selection);
      break;
  }
  
  if (!send_command (io, this, this->str))
    goto fail;
  
  if (!get_answer (io, this))
    goto fail;

  if (get_header(io, this) != SUCCESS)
    goto fail;

  interp_header(io, this);
  if (!this->packet_length || !this->num_stream_ids)
    goto fail;
  
  for (i = 0; i < this->num_stream_ids; i++) {
    if ((this->streams[i].stream_id != audio_stream) &&
        (this->streams[i].stream_id != video_stream)) {
      lprintf("disabling stream %d\n", this->streams[i].stream_id);

      /* forces the asf demuxer to not choose this stream */
      if (this->streams[i].bitrate_pos) {
        if (this->streams[i].bitrate_pos + 3 < ASF_HEADER_SIZE) {
          this->asf_header[this->streams[i].bitrate_pos]     = 0;
          this->asf_header[this->streams[i].bitrate_pos + 1] = 0;
          this->asf_header[this->streams[i].bitrate_pos + 2] = 0;
          this->asf_header[this->streams[i].bitrate_pos + 3] = 0;
        } else {
          lprintf("mmsh: attempt to write beyond asf header limit");
        }
      }
    }
  }
  return 1;
fail:
  close(this->s);
  this->s = -1;
  return 0;
}

mmsh_t *mmsh_connect (mms_io_t *io, void *data, const char *url, int bandwidth) {
  mmsh_t *this;
  GURI  *uri = NULL;
  GURI  *proxy_uri = NULL;
  char  *proxy_env;
  if (!url)
    return NULL;

  /*
   * initializatoin is essential here.  the fail: label depends
   * on the various char * in our this structure to be
   * NULL if they haven't been assigned yet.
   */
  this = (mmsh_t*) malloc (sizeof (mmsh_t));
  this->url=NULL;
  this->proxy_url = NULL;
  this->proto = NULL;
  this->connect_host = NULL;
  this->http_host = NULL;
  this->proxy_user = NULL;
  this->proxy_password = NULL;
  this->host_user = NULL;
  this->host_password = NULL;
  this->uri = NULL;

  this->url             = strdup(url);
  if ((proxy_env = getenv("http_proxy")) != NULL)
    this->proxy_url = strdup(proxy_env);
  else
    this->proxy_url = NULL;
  this->s               = -1;
  this->asf_header_len  = 0;
  this->asf_header_read = 0;
  this->num_stream_ids  = 0;
  this->packet_length   = 0;
  this->buf_size        = 0;
  this->buf_read        = 0;
  this->has_audio       = 0;
  this->has_video       = 0;
  this->current_pos     = 0;
  this->user_bandwidth  = bandwidth;
  this->http_request_number = 1;

  if (this->proxy_url) {
    proxy_uri = gnet_uri_new(this->proxy_url);
    if (!proxy_uri) {
      lprintf("mmsh: invalid proxy url\n");
      goto fail;
    }
    if (! proxy_uri->port ) {
      proxy_uri->port = 3128; //default squid port
    }
  }
  uri = gnet_uri_new(this->url);
  if (!uri) {
    lprintf("mmsh: invalid url\n");
    goto fail;
  }
  if (! uri->port ) {
    //checked in tcp_connect, but it's better to initialize it here
    uri->port = MMSH_PORT;
  }
  if (this->proxy_url) {
    this->proto = (uri->scheme) ? strdup(uri->scheme) : NULL;
    this->connect_host = (proxy_uri->hostname) ? strdup(proxy_uri->hostname) : NULL;
    this->connect_port = proxy_uri->port;
    this->http_host = (uri->scheme) ? strdup(uri->hostname) : NULL;
    this->http_port = uri->port;
    this->proxy_user = (proxy_uri->user) ? strdup(proxy_uri->user) : NULL;
    this->proxy_password = (proxy_uri->passwd) ? strdup(proxy_uri->passwd) : NULL;
    this->host_user = (uri->user) ? strdup(uri->user) : NULL;
    this->host_password = (uri->passwd) ? strdup(uri->passwd) : NULL;
    gnet_uri_set_scheme(uri,"http");
    this->uri = gnet_mms_helper(uri, 1);
  } else {
    this->proto = (uri->scheme) ? strdup(uri->scheme) : NULL;
    this->connect_host = (uri->hostname) ? strdup(uri->hostname) : NULL;
    this->connect_port = uri->port;
    this->http_host = (uri->hostname) ? strdup(uri->hostname) : NULL;
    this->http_port = uri->port;
    this->proxy_user = NULL;
    this->proxy_password = NULL;
    this->host_user =(uri->user) ?  strdup(uri->user) : NULL;
    this->host_password = (uri->passwd) ? strdup(uri->passwd) : NULL;
    this->uri = gnet_mms_helper(uri, 1);
  }

  if(!this->uri)
        goto fail;

  if (proxy_uri) {
    gnet_uri_delete(proxy_uri);
    proxy_uri = NULL;
  }
  if (uri) {
    gnet_uri_delete(uri);
    uri = NULL;
  }
  if (!mmsh_valid_proto(this->proto)) {
    lprintf("mmsh: unsupported protocol\n");
    goto fail;
  }

  if (!mmsh_connect_int(io, this, 0, 0))
    goto fail;

  return this;

fail:
  lprintf("mmsh: connect failed\n");
  if (proxy_uri)
    gnet_uri_delete(proxy_uri);
  if (uri)
    gnet_uri_delete(uri);
  if (this->s != -1)
    close(this->s);
  if (this->url)
    free(this->url);
  if (this->proxy_url)
    free(this->proxy_url);
  if (this->proto)
    free(this->proto);
  if (this->connect_host)
    free(this->connect_host);
  if (this->http_host)
    free(this->http_host);
  if (this->proxy_user)
    free(this->proxy_user);
  if (this->proxy_password)
    free(this->proxy_password);
  if (this->host_user)
    free(this->host_user);
  if (this->host_password)
    free(this->host_password);
  if (this->uri)
    free(this->uri);

  free(this);
  return NULL;
}

static int get_media_packet (mms_io_t *io, mmsh_t *this) {
  int ret, len = 0;

  if (get_chunk_header(io, this) == SUCCESS) {
    switch (this->chunk_type) {
      case CHUNK_TYPE_END:
        /* this->chunk_seq_number:
         *     0: stop
         *     1: a new stream follows
         */
        if (this->chunk_seq_number == 0)
          return EOS;

        this->http_request_number = 1;
        if (!mmsh_connect_int (io, this, 0, 0))
          return ERROR;

        /* What todo with: current_pos ??
           Also our chunk_seq_numbers will probably restart from 0!
           If this happens with a seekable stream (does it ever?)
           and we get a seek request after this were fscked! */
        this->seekable = 0;

        /* mmsh_connect_int reads the first data packet */
        /* this->buf_size is set by mmsh_connect_int */
        return GOT_HEADER_N_DATA;

      case CHUNK_TYPE_DATA:
        /* nothing to do */
        break;

      case CHUNK_TYPE_RESET:
        /* next chunk is an ASF header */

        if (this->chunk_length != 0) {
          /* that's strange, don't know what to do */
          lprintf("mmsh: non 0 sized reset chunk");
          return ERROR;
        }
        if ((ret = get_header (io, this)) != SUCCESS) {
          lprintf("mmsh: failed to get header after reset chunk\n");
          return ret;
        }
        interp_header(io, this);

        /* What todo with: current_pos ??
           Also our chunk_seq_numbers might restart from 0!
           If this happens with a seekable stream (does it ever?) 
           and we get a seek request after this were fscked! */
        this->seekable = 0;

        /* get_header reads the first data packet */
        /* this->buf_size is set by get_header */
        return GOT_HEADER_N_DATA;

      default:
        lprintf("mmsh: unexpected chunk_type(0x%04x)\n", this->chunk_type);
        return ERROR;
    }

    len = io_read (io, this->s, this->buf, this->chunk_length, this->need_abort);
      
    if (len == this->chunk_length) {
      /* explicit padding with 0 */
      if (this->chunk_length > this->packet_length) {
        lprintf("mmsh: chunk_length(%d) > packet_length(%d)\n",
                this->chunk_length, this->packet_length);
        return ERROR;
      }

      memset(this->buf + this->chunk_length, 0,
             this->packet_length - this->chunk_length);
      this->buf_size = this->packet_length;

      return SUCCESS;
    } else {
      lprintf("mmsh: media packet read error, %d != %d\n", len,
              this->chunk_length);
      return ERROR;
    }
  } else if (ret == EOS) {
    return EOS;
  } else {
    lprintf("mmsh: get_media_packet failed to get chunk header\n");
    return ret;
  }
}

int mmsh_peek_header (mmsh_t *this, char *data, int maxsize) {
  int len;

  len = (this->asf_header_len < maxsize) ? this->asf_header_len : maxsize;

  memcpy(data, this->asf_header, len);
  return len;
}

int mmsh_read (mms_io_t *io, mmsh_t *this, char *data, int len, int *need_abort) {
  int total;

  total = 0;

  /* Check if the stream didn't get closed because of previous errors */
  if (this->s == -1)
    return total;

  while (total < len && (!need_abort || !(*need_abort))) {

    if (this->asf_header_read < this->asf_header_len) {
      int n, bytes_left ;

      bytes_left = this->asf_header_len - this->asf_header_read ;

      if ((len-total) < bytes_left)
        n = len-total;
      else
        n = bytes_left;

      memcpy (&data[total], &this->asf_header[this->asf_header_read], n);

      this->asf_header_read += n;
      total += n;
      this->current_pos += n;
    } else {

      int n, bytes_left ;

      bytes_left = this->buf_size - this->buf_read;

      if (bytes_left == 0) {
        int ret;

        this->buf_size=this ->buf_read = 0;
        ret = get_media_packet (io, this);

        switch (ret) {
        case SUCCESS:
          break;
        case ERROR:
          lprintf ("mmsh: get_media_packet failed\n");
          return total;
        case EOS:
          return total;
        case GOT_HEADER_N_DATA:
          continue;
        }
        bytes_left = this->buf_size;
      }

      if ((len-total) < bytes_left)
        n = len-total;
      else
        n = bytes_left;

      memcpy (&data[total], &this->buf[this->buf_read], n);

      this->buf_read += n;
      total += n;
      this->current_pos += n;
    }
  }
  return total;
}

off_t mmsh_seek (mms_io_t *io, mmsh_t *this, off_t offset, int origin) {
  off_t dest;
  off_t dest_packet_seq;
  uint32_t orig_asf_header_len = this->asf_header_len;
  uint32_t orig_asf_packet_len = this->packet_length;
  
  if (!this->seekable)
    return this->current_pos;
  
  switch (origin) {
    case SEEK_SET:
      dest = offset;
      break;
    case SEEK_CUR:
      dest = this->current_pos + offset;
      break;
    case SEEK_END:
      dest = mmsh_get_length (this) + offset;
    default:
      return this->current_pos;
  }

  dest_packet_seq = dest - this->asf_header_len;
  dest_packet_seq = dest_packet_seq >= 0 ?
    dest_packet_seq / this->packet_length : -1;

  if (dest_packet_seq < 0) {
    if (this->chunk_seq_number > 0) {
      lprintf("mmsh: seek within header, already read beyond first packet, resetting connection\n");
      if (!mmsh_connect_int(io, this, 0, 0)) {
        /* Oops no more connection let our caller know things are fscked up */
        return this->current_pos = -1;
      }
      /* Some what simple / naive check to check for changed headers
         if the header was changed we are once more fscked up */
      if (this->asf_header_len != orig_asf_header_len ||
          this->packet_length  != orig_asf_packet_len) {
        lprintf("mmsh: AIIEEE asf header or packet length changed on re-open for seek\n");
        /* Its a different stream, so its useless! */
        close (this->s);
        this->s = -1;
        return this->current_pos = -1;
      }
    } else
      lprintf("mmsh: seek within header, resetting buf_read\n");

    // reset buf_read
    this->buf_read = 0;
    this->asf_header_read = dest;
    return this->current_pos = dest;
  }

  // dest_packet_seq >= 0
  if (this->asf_num_packets && dest == this->asf_header_len +
      this->asf_num_packets*this->packet_length) {
    // Requesting the packet beyond the last packet, can cause the server to
    // not return any packet or any eos command.  This can cause
    // mms_packet_seek() to hang.
    // This is to allow seeking at end of stream, and avoid hanging.
    --dest_packet_seq;
    lprintf("mmsh: seek to eos!\n");
  }

  if (dest_packet_seq != this->chunk_seq_number) {

    if (this->asf_num_packets && dest_packet_seq >= this->asf_num_packets) {
      // Do not seek beyond the last packet.
      return this->current_pos;
    }
    
    lprintf("mmsh: seek to %d, packet: %d\n", (int)dest, (int)dest_packet_seq);
    if (!mmsh_connect_int(io, this, (dest_packet_seq+1) * this->packet_length, 0)) {
      /* Oops no more connection let our caller know things are fscked up */
      return this->current_pos = -1;
    }
    /* Some what simple / naive check to check for changed headers
       if the header was changed we are once more fscked up */
    if (this->asf_header_len != orig_asf_header_len ||
        this->packet_length  != orig_asf_packet_len) {
      lprintf("mmsh: AIIEEE asf header or packet length changed on re-open for seek\n");
      /* Its a different stream, so its useless! */
      close (this->s);
      this->s = -1;
      return this->current_pos = -1;
    }
  }
  else
    lprintf("mmsh: seek within current packet, dest: %d, current pos: %d\n",
       (int)dest, (int)this->current_pos);

  /* make sure asf_header is seen as fully read by mmsh_read() this is needed
     in case our caller tries to seek over part of the header, or when we've
     done an actual packet seek as get_header() resets asf_header_read then. */
  this->asf_header_read = this->asf_header_len;

  /* check we got what we want */
  if (dest_packet_seq == this->chunk_seq_number) {
    this->buf_read = dest -
      (this->asf_header_len + dest_packet_seq*this->packet_length);
    this->current_pos = dest;
  } else {
    lprintf("mmsh: Seek failed, wanted packet: %d, got packet: %d\n",
      (int)dest_packet_seq, (int)this->chunk_seq_number);
    this->buf_read = 0;
    this->current_pos = this->asf_header_len + this->chunk_seq_number *
      this->packet_length;
  }

  lprintf("mmsh: current_pos after seek to %d: %d (buf_read %d)\n",
    (int)dest, (int)this->current_pos, (int)this->buf_read);

  return this->current_pos;
}

int mmsh_time_seek (mms_io_t *io, mmsh_t *this, double time_sec) {
  uint32_t orig_asf_header_len = this->asf_header_len;
  uint32_t orig_asf_packet_len = this->packet_length;

  if (!this->seekable)
    return 0;

  lprintf("mmsh: time seek to %f secs\n", time_sec);
  if (!mmsh_connect_int(io, this, 0, time_sec * 1000 + this->preroll)) {
    /* Oops no more connection let our caller know things are fscked up */
    this->current_pos = -1;
    return 0;
  }
  /* Some what simple / naive check to check for changed headers
     if the header was changed we are once more fscked up */
  if (this->asf_header_len != orig_asf_header_len ||
      this->packet_length  != orig_asf_packet_len) {
    lprintf("mmsh: AIIEEE asf header or packet length changed on re-open for seek\n");
    /* Its a different stream, so its useless! */
    close (this->s);
    this->s = -1;
    this->current_pos = -1;
    return 0;
  }

  this->asf_header_read = this->asf_header_len;
  this->buf_read = 0;
  this->current_pos = this->asf_header_len + this->chunk_seq_number *
    this->packet_length;
  
  lprintf("mmsh, current_pos after time_seek:%d\n", (int)this->current_pos);

  return 1;
}

void mmsh_close (mmsh_t *this) {
  if (this->s != -1)
    close(this->s);
  if (this->url)
    free(this->url);
  if (this->proxy_url)
    free(this->proxy_url);
  if (this->proto)
    free(this->proto);
  if (this->connect_host)
    free(this->connect_host);
  if (this->http_host)
    free(this->http_host);
  if (this->proxy_user)
    free(this->proxy_user);
  if (this->proxy_password)
    free(this->proxy_password);
  if (this->host_user)
    free(this->host_user);
  if (this->host_password)
    free(this->host_password);
  if (this->uri)
    free(this->uri);
  if (this)
    free (this);
}


uint32_t mmsh_get_length (mmsh_t *this) {
  /* we could / should return this->file_len here, but usually this->file_len
     is longer then the calculation below, as usually an asf file contains an
     asf index object after the data stream. However since we do not have a
     (known) way to get to this index object through mms, we return a
     calculated size of what we can get to when we know. */
  if (this->asf_num_packets)
    return this->asf_header_len + this->asf_num_packets*this->packet_length;
  else
    return this->file_length;
}

double mmsh_get_time_length (mmsh_t *this) {
  return (double)(this->time_len) / 1e7;
}

uint64_t mmsh_get_raw_time_length (mmsh_t *this) {
  return this->time_len;
}

off_t mmsh_get_current_pos (mmsh_t *this) {
  return this->current_pos;
}

uint32_t mmsh_get_asf_header_len (mmsh_t *this) {
  return this->asf_header_len;
}

uint32_t mmsh_get_asf_packet_len (mmsh_t *this) {
  return this->packet_length;
}

int mmsh_get_seekable (mmsh_t *this) {
  return this->seekable;
}