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 "m_option.h"
  56 #include "m_struct.h"
  57 #include "libavutil/common.h"
  58 #include "mpbswap.h"
  59
  60 #include "network.h"
  61 #include "stream_netstream.h"
  62 #include "tcp.h"
  63
  64 static struct stream_priv_s {
  65   char* host;
  66   int port;
  67   char* url;
  68 } stream_priv_dflts = {
  69   NULL,
  70   10000,
  71   NULL
  72 };
  73
  74 #define ST_OFF(f) M_ST_OFF(struct stream_priv_s,f)
  75 /// URL definition
  76 static const m_option_t stream_opts_fields[] = {
  77   {"hostname", ST_OFF(host), CONF_TYPE_STRING, 0, 0 ,0, NULL},
  78   {"port", ST_OFF(port), CONF_TYPE_INT, M_OPT_MIN, 1 ,0, NULL},
  79   {"filename", ST_OFF(url), CONF_TYPE_STRING, 0, 0 ,0, NULL},
  80   { NULL, NULL, 0, 0, 0, 0,  NULL }
  81 };
  82 static const struct m_struct_st stream_opts = {
  83   "netstream",
  84   sizeof(struct stream_priv_s),
  85   &stream_priv_dflts,
  86   stream_opts_fields
  87 };
  88
  89 //// When the cache is running we need a lock as
  90 //// fill_buffer is called from another proccess
  91 static int lock_fd(int fd) {
  92 #if !HAVE_WINSOCK2_H
  93   struct flock lock;
  94
  95   memset(&lock,0,sizeof(struct flock));
  96   lock.l_type = F_WRLCK;
  97
  98   mp_msg(MSGT_STREAM,MSGL_DBG2, "Lock (%d)\n",getpid());
  99   do {
 100     if(fcntl(fd,F_SETLKW,&lock)) {
 101       if(errno == EAGAIN) continue;
 102       mp_msg(MSGT_STREAM,MSGL_ERR, "Failed to get the lock: %s\n",
 103              strerror(errno));
 104       return 0;
 105     }
 106   } while(0);
 107   mp_msg(MSGT_STREAM,MSGL_DBG2, "Locked (%d)\n",getpid());
 108 #else
 109 printf("FIXME? should lock here\n");
 110 #endif
 111   return 1;
 112 }
 113
 114 static int unlock_fd(int fd) {
 115 #if !HAVE_WINSOCK2_H
 116   struct flock lock;
 117
 118   memset(&lock,0,sizeof(struct flock));
 119   lock.l_type = F_UNLCK;
 120
 121   mp_msg(MSGT_STREAM,MSGL_DBG2, "Unlock (%d)\n",getpid());
 122   if(fcntl(fd,F_SETLK,&lock)) {
 123     mp_msg(MSGT_STREAM,MSGL_ERR, "Failed to release the lock: %s\n",
 124            strerror(errno));
 125     return 0;
 126   }
 127 #else
 128 printf("FIXME? should unlock here\n");
 129 #endif
 130   return 1;
 131 }
 132
 133 static mp_net_stream_packet_t* send_net_stream_cmd(stream_t *s,uint16_t cmd,char* data,int len) {
 134   mp_net_stream_packet_t* pack;
 135
 136   // Cache is enabled : lock
 137   if(s->cache_data && !lock_fd(s->fd))
 138     return NULL;
 139   // Send a command
 140   if(!write_packet(s->fd,cmd,data,len)) {
 141     if(s->cache_data) unlock_fd(s->fd);
 142     return 0;
 143   }
 144   // Read the response
 145   pack = read_packet(s->fd);
 146   // Now we can unlock
 147   if(s->cache_data) unlock_fd(s->fd);
 148
 149   if(!pack)
 150     return NULL;
 151
 152   switch(pack->cmd) {
 153   case NET_STREAM_OK:
 154     return pack;
 155   case NET_STREAM_ERROR:
 156     if(pack->len > sizeof(mp_net_stream_packet_t))
 157       mp_msg(MSGT_STREAM,MSGL_ERR, "Fill buffer failed: %s\n",pack->data);
 158     else
 159       mp_msg(MSGT_STREAM,MSGL_ERR, "Fill buffer failed\n");
 160     free(pack);
 161     return NULL;
 162   }
 163
 164   mp_msg(MSGT_STREAM,MSGL_ERR, "Unknown response to %d: %d\n",cmd,pack->cmd);
 165   free(pack);
 166   return NULL;
 167 }
 168
 169 static int fill_buffer(stream_t *s, char* buffer, int max_len){
 170   uint16_t len = le2me_16(max_len);
 171   mp_net_stream_packet_t* pack;
 172
 173   pack = send_net_stream_cmd(s,NET_STREAM_FILL_BUFFER,(char*)&len,2);
 174   if(!pack) {
 175     return -1;
 176   }
 177   len = pack->len - sizeof(mp_net_stream_packet_t);
 178   if(len > max_len) {
 179     mp_msg(MSGT_STREAM,MSGL_ERR, "Got a too big a packet %d / %d\n",len,max_len);
 180     free(pack);
 181     return 0;
 182   }
 183   if(len > 0)
 184     memcpy(buffer,pack->data,len);
 185   free(pack);
 186   return len;
 187 }
 188
 189
 190 static int seek(stream_t *s,off_t newpos) {
 191   uint64_t pos = le2me_64((uint64_t)newpos);
 192   mp_net_stream_packet_t* pack;
 193
 194   pack = send_net_stream_cmd(s,NET_STREAM_SEEK,(char*)&pos,8);
 195   if(!pack) {
 196     return 0;
 197   }
 198   s->pos = newpos;
 199   free(pack);
 200   return 1;
 201 }
 202
 203 static int net_stream_reset(struct stream *s) {
 204   mp_net_stream_packet_t* pack;
 205
 206   pack = send_net_stream_cmd(s,NET_STREAM_RESET,NULL,0);
 207   if(!pack) {
 208     return 0;
 209   }
 210   free(pack);
 211   return 1;
 212 }
 213
 214 static int control(struct stream *s,int cmd,void* arg) {
 215   switch(cmd) {
 216   case STREAM_CTRL_RESET:
 217     return net_stream_reset(s);
 218   }
 219   return STREAM_UNSUPPORTED;
 220 }
 221
 222 static void close_s(struct stream *s) {
 223   mp_net_stream_packet_t* pack;
 224
 225   pack = send_net_stream_cmd(s,NET_STREAM_CLOSE,NULL,0);
 226   if(pack)
 227     free(pack);
 228 }
 229
 230 static int open_s(stream_t *stream,int mode, void* opts, int* file_format) {
 231   int f;
 232   struct stream_priv_s* p = (struct stream_priv_s*)opts;
 233   mp_net_stream_packet_t* pack;
 234   mp_net_stream_opened_t* opened;
 235
 236   if(mode != STREAM_READ)
 237     return STREAM_UNSUPPORTED;
 238
 239   if(!p->host) {
 240     mp_msg(MSGT_OPEN,MSGL_ERR, "We need an host name (ex: mpst://server.net/cdda://5)\n");
 241     m_struct_free(&stream_opts,opts);
 242     return STREAM_ERROR;
 243   }
 244   if(!p->url || strlen(p->url) == 0) {
 245     mp_msg(MSGT_OPEN,MSGL_ERR, "We need a remote url (ex: mpst://server.net/cdda://5)\n");
 246     m_struct_free(&stream_opts,opts);
 247     return STREAM_ERROR;
 248   }
 249
 250   f = connect2Server(p->host,p->port,1);
 251   if(f < 0) {
 252     mp_msg(MSGT_OPEN,MSGL_ERR, "Connection to %s:%d failed\n",p->host,p->port);
 253     m_struct_free(&stream_opts,opts);
 254     return STREAM_ERROR;
 255   }
 256   stream->fd = f;
 257   /// Now send an open command
 258   pack = send_net_stream_cmd(stream,NET_STREAM_OPEN,p->url,strlen(p->url) + 1);
 259   if(!pack) {
 260     goto error;
 261   }
 262
 263   if(pack->len != sizeof(mp_net_stream_packet_t) +
 264      sizeof(mp_net_stream_opened_t)) {
 265     mp_msg(MSGT_OPEN,MSGL_ERR, "Invalid open response packet len (%d bytes)\n",pack->len);
 266     free(pack);
 267     goto error;
 268   }
 269
 270   opened = (mp_net_stream_opened_t*)pack->data;
 271   net_stream_opened_2_me(opened);
 272
 273   *file_format = opened->file_format;
 274   stream->flags = opened->flags;
 275   stream->sector_size = opened->sector_size;
 276   stream->start_pos = opened->start_pos;
 277   stream->end_pos = opened->end_pos;
 278
 279   stream->fill_buffer = fill_buffer;
 280   stream->control = control;
 281   if(stream->flags & MP_STREAM_SEEK)
 282     stream->seek = seek;
 283   stream->close = close_s;
 284
 285   free(pack);
 286   m_struct_free(&stream_opts,opts);
 287
 288   return STREAM_OK;
 289
 290   error:
 291   closesocket(f);
 292   m_struct_free(&stream_opts,opts);
 293   return STREAM_ERROR;
 294 }
 295
 296 const stream_info_t stream_info_netstream = {
 297   "Net stream",
 298   "netstream",
 299   "Albeu",
 300   "",
 301   open_s,
 302   { "mpst",NULL },
 303   &stream_opts,
 304   1 // Url is an option string
 305 };