stream/stream_netstream.c

   1 /*
   2  * Copyright (C) Alban Bedel - 04/2003
   3  *
   4  * This file is part of MPlayer.
   5  *
   6  * MPlayer is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * MPlayer is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with MPlayer; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19  */
  20
  21 /*
  22  *  Net stream allow you to access MPlayer stream accross a tcp
  23  *  connection.
  24  *  Note that at least mf and tv use a dummy stream (they are
  25  *  implemented at the demuxer level) so you won't be able to
  26  *  access those :(( but dvd, vcd and so on should work perfectly
  27  *  (if you have the bandwidth ;)
  28  *   A simple server is in TOOLS/netstream.
  29  *
  30  */
  31
  32
  33 #include "config.h"
  34
  35 #include <sys/types.h>
  36 #include <sys/stat.h>
  37 #include <fcntl.h>
  38 #include <unistd.h>
  39
  40 #include <stdlib.h>
  41 #include <stdio.h>
  42 #include <inttypes.h>
  43 #include <errno.h>
  44
  45 #if !HAVE_WINSOCK2_H
  46 #include <sys/socket.h>
  47 #include <netinet/in.h>
  48 #include <arpa/inet.h>
  49 #else
  50 #include <winsock2.h>
  51 #endif
  52
  53 #include "mp_msg.h"
  54 #include "stream.h"
  55 #include "help_mp.h"
  56 #include "m_option.h"
  57 #include "m_struct.h"
  58 #include "libavutil/common.h"
  59 #include "mpbswap.h"
  60
  61 #include "network.h"
  62 #include "stream_netstream.h"
  63 #include "tcp.h"
  64
  65 static struct stream_priv_s {
  66   char* host;
  67   int port;
  68   char* url;
  69 } stream_priv_dflts = {
  70   NULL,
  71   10000,
  72   NULL
  73 };
  74
  75 #define ST_OFF(f) M_ST_OFF(struct stream_priv_s,f)
  76 /// URL definition
  77 static const m_option_t stream_opts_fields[] = {
  78   {"hostname", ST_OFF(host), CONF_TYPE_STRING, 0, 0 ,0, NULL},
  79   {"port", ST_OFF(port), CONF_TYPE_INT, M_OPT_MIN, 1 ,0, NULL},
  80   {"filename", ST_OFF(url), CONF_TYPE_STRING, 0, 0 ,0, NULL},
  81   { NULL, NULL, 0, 0, 0, 0,  NULL }
  82 };
  83 static const struct m_struct_st stream_opts = {
  84   "netstream",
  85   sizeof(struct stream_priv_s),
  86   &stream_priv_dflts,
  87   stream_opts_fields
  88 };
  89
  90 //// When the cache is running we need a lock as
  91 //// fill_buffer is called from another proccess
  92 static int lock_fd(int fd) {
  93 #if !HAVE_WINSOCK2_H
  94   struct flock lock;
  95
  96   memset(&lock,0,sizeof(struct flock));
  97   lock.l_type = F_WRLCK;
  98
  99   mp_msg(MSGT_STREAM,MSGL_DBG2, "Lock (%d)\n",getpid());
 100   do {
 101     if(fcntl(fd,F_SETLKW,&lock)) {
 102       if(errno == EAGAIN) continue;
 103       mp_msg(MSGT_STREAM,MSGL_ERR, "Failed to get the lock: %s\n",
 104              strerror(errno));
 105       return 0;
 106     }
 107   } while(0);
 108   mp_msg(MSGT_STREAM,MSGL_DBG2, "Locked (%d)\n",getpid());
 109 #else
 110 printf("FIXME? should lock here\n");
 111 #endif
 112   return 1;
 113 }
 114
 115 static int unlock_fd(int fd) {
 116 #if !HAVE_WINSOCK2_H
 117   struct flock lock;
 118
 119   memset(&lock,0,sizeof(struct flock));
 120   lock.l_type = F_UNLCK;
 121
 122   mp_msg(MSGT_STREAM,MSGL_DBG2, "Unlock (%d)\n",getpid());
 123   if(fcntl(fd,F_SETLK,&lock)) {
 124     mp_msg(MSGT_STREAM,MSGL_ERR, "Failed to release the lock: %s\n",
 125            strerror(errno));
 126     return 0;
 127   }
 128 #else
 129 printf("FIXME? should unlock here\n");
 130 #endif
 131   return 1;
 132 }
 133
 134 static mp_net_stream_packet_t* send_net_stream_cmd(stream_t *s,uint16_t cmd,char* data,int len) {
 135   mp_net_stream_packet_t* pack;
 136
 137   // Cache is enabled : lock
 138   if(s->cache_data && !lock_fd(s->fd))
 139     return NULL;
 140   // Send a command
 141   if(!write_packet(s->fd,cmd,data,len)) {
 142     if(s->cache_data) unlock_fd(s->fd);
 143     return 0;
 144   }
 145   // Read the response
 146   pack = read_packet(s->fd);
 147   // Now we can unlock
 148   if(s->cache_data) unlock_fd(s->fd);
 149
 150   if(!pack)
 151     return NULL;
 152
 153   switch(pack->cmd) {
 154   case NET_STREAM_OK:
 155     return pack;
 156   case NET_STREAM_ERROR:
 157     if(pack->len > sizeof(mp_net_stream_packet_t))
 158       mp_msg(MSGT_STREAM,MSGL_ERR, "Fill buffer failed: %s\n",pack->data);
 159     else
 160       mp_msg(MSGT_STREAM,MSGL_ERR, "Fill buffer failed\n");
 161     free(pack);
 162     return NULL;
 163   }
 164
 165   mp_msg(MSGT_STREAM,MSGL_ERR, "Unknown response to %d: %d\n",cmd,pack->cmd);
 166   free(pack);
 167   return NULL;
 168 }
 169
 170 static int fill_buffer(stream_t *s, char* buffer, int max_len){
 171   uint16_t len = le2me_16(max_len);
 172   mp_net_stream_packet_t* pack;
 173
 174   pack = send_net_stream_cmd(s,NET_STREAM_FILL_BUFFER,(char*)&len,2);
 175   if(!pack) {
 176     return -1;
 177   }
 178   len = pack->len - sizeof(mp_net_stream_packet_t);
 179   if(len > max_len) {
 180     mp_msg(MSGT_STREAM,MSGL_ERR, "Got a too big a packet %d / %d\n",len,max_len);
 181     free(pack);
 182     return 0;
 183   }
 184   if(len > 0)
 185     memcpy(buffer,pack->data,len);
 186   free(pack);
 187   return len;
 188 }
 189
 190
 191 static int seek(stream_t *s,off_t newpos) {
 192   uint64_t pos = le2me_64((uint64_t)newpos);
 193   mp_net_stream_packet_t* pack;
 194
 195   pack = send_net_stream_cmd(s,NET_STREAM_SEEK,(char*)&pos,8);
 196   if(!pack) {
 197     return 0;
 198   }
 199   s->pos = newpos;
 200   free(pack);
 201   return 1;
 202 }
 203
 204 static int net_stream_reset(struct stream_st *s) {
 205   mp_net_stream_packet_t* pack;
 206
 207   pack = send_net_stream_cmd(s,NET_STREAM_RESET,NULL,0);
 208   if(!pack) {
 209     return 0;
 210   }
 211   free(pack);
 212   return 1;
 213 }
 214
 215 static int control(struct stream_st *s,int cmd,void* arg) {
 216   switch(cmd) {
 217   case STREAM_CTRL_RESET:
 218     return net_stream_reset(s);
 219   }
 220   return STREAM_UNSUPPORTED;
 221 }
 222
 223 static void close_s(struct stream_st *s) {
 224   mp_net_stream_packet_t* pack;
 225
 226   pack = send_net_stream_cmd(s,NET_STREAM_CLOSE,NULL,0);
 227   if(pack)
 228     free(pack);
 229 }
 230
 231 static int open_s(stream_t *stream,int mode, void* opts, int* file_format) {
 232   int f;
 233   struct stream_priv_s* p = (struct stream_priv_s*)opts;
 234   mp_net_stream_packet_t* pack;
 235   mp_net_stream_opened_t* opened;
 236
 237   if(mode != STREAM_READ)
 238     return STREAM_UNSUPPORTED;
 239
 240   if(!p->host) {
 241     mp_msg(MSGT_OPEN,MSGL_ERR, "We need an host name (ex: mpst://server.net/cdda://5)\n");
 242     m_struct_free(&stream_opts,opts);
 243     return STREAM_ERROR;
 244   }
 245   if(!p->url || strlen(p->url) == 0) {
 246     mp_msg(MSGT_OPEN,MSGL_ERR, "We need a remote url (ex: mpst://server.net/cdda://5)\n");
 247     m_struct_free(&stream_opts,opts);
 248     return STREAM_ERROR;
 249   }
 250
 251   f = connect2Server(p->host,p->port,1);
 252   if(f < 0) {
 253     mp_msg(MSGT_OPEN,MSGL_ERR, "Connection to %s:%d failed\n",p->host,p->port);
 254     m_struct_free(&stream_opts,opts);
 255     return STREAM_ERROR;
 256   }
 257   stream->fd = f;
 258   /// Now send an open command
 259   pack = send_net_stream_cmd(stream,NET_STREAM_OPEN,p->url,strlen(p->url) + 1);
 260   if(!pack) {
 261     goto error;
 262   }
 263
 264   if(pack->len != sizeof(mp_net_stream_packet_t) +
 265      sizeof(mp_net_stream_opened_t)) {
 266     mp_msg(MSGT_OPEN,MSGL_ERR, "Invalid open response packet len (%d bytes)\n",pack->len);
 267     free(pack);
 268     goto error;
 269   }
 270
 271   opened = (mp_net_stream_opened_t*)pack->data;
 272   net_stream_opened_2_me(opened);
 273
 274   *file_format = opened->file_format;
 275   stream->flags = opened->flags;
 276   stream->sector_size = opened->sector_size;
 277   stream->start_pos = opened->start_pos;
 278   stream->end_pos = opened->end_pos;
 279
 280   stream->fill_buffer = fill_buffer;
 281   stream->control = control;
 282   if(stream->flags & STREAM_SEEK)
 283     stream->seek = seek;
 284   stream->close = close_s;
 285
 286   free(pack);
 287   m_struct_free(&stream_opts,opts);
 288
 289   return STREAM_OK;
 290
 291   error:
 292   closesocket(f);
 293   m_struct_free(&stream_opts,opts);
 294   return STREAM_ERROR;
 295 }
 296
 297 const stream_info_t stream_info_netstream = {
 298   "Net stream",
 299   "netstream",
 300   "Albeu",
 301   "",
 302   open_s,
 303   { "mpst",NULL },
 304   &stream_opts,
 305   1 // Url is an option string
 306 };