aboutsummaryrefslogtreecommitdiffhomepage
path: root/stream/stream_netstream.c
blob: 734c1f6412777b0b64c8aa03be7a24c09aa679ce (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
/*
 * Copyright (C) Alban Bedel - 04/2003
 *
 * This file is part of MPlayer.
 *
 * MPlayer 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.
 *
 * MPlayer 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 MPlayer; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

/*
 *  Net stream allow you to access MPlayer stream accross a tcp
 *  connection.
 *  Note that at least mf and tv use a dummy stream (they are
 *  implemented at the demuxer level) so you won't be able to
 *  access those :(( but dvd, vcd and so on should work perfectly
 *  (if you have the bandwidth ;)
 *   A simple server is in TOOLS/netstream.
 *
 */


#include "config.h"

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>

#include <stdlib.h>
#include <stdio.h>
#include <inttypes.h>
#include <errno.h>

#if !HAVE_WINSOCK2_H
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#else
#include <winsock2.h>
#endif

#include "mp_msg.h"
#include "stream.h"
#include "help_mp.h"
#include "m_option.h"
#include "m_struct.h"
#include "libavutil/common.h"
#include "mpbswap.h"

#include "network.h"
#include "stream_netstream.h"
#include "tcp.h"

static struct stream_priv_s {
  char* host;
  int port;
  char* url;
} stream_priv_dflts = {
  NULL,
  10000,
  NULL
};

#define ST_OFF(f) M_ST_OFF(struct stream_priv_s,f)
/// URL definition
static const m_option_t stream_opts_fields[] = {
  {"hostname", ST_OFF(host), CONF_TYPE_STRING, 0, 0 ,0, NULL},
  {"port", ST_OFF(port), CONF_TYPE_INT, M_OPT_MIN, 1 ,0, NULL},
  {"filename", ST_OFF(url), CONF_TYPE_STRING, 0, 0 ,0, NULL},
  { NULL, NULL, 0, 0, 0, 0,  NULL }
};
static const struct m_struct_st stream_opts = {
  "netstream",
  sizeof(struct stream_priv_s),
  &stream_priv_dflts,
  stream_opts_fields
};

//// When the cache is running we need a lock as
//// fill_buffer is called from another proccess
static int lock_fd(int fd) {
#if !HAVE_WINSOCK2_H
  struct flock lock;

  memset(&lock,0,sizeof(struct flock));
  lock.l_type = F_WRLCK;

  mp_msg(MSGT_STREAM,MSGL_DBG2, "Lock (%d)\n",getpid());
  do {    
    if(fcntl(fd,F_SETLKW,&lock)) {
      if(errno == EAGAIN) continue;
      mp_msg(MSGT_STREAM,MSGL_ERR, "Failed to get the lock: %s\n",
	     strerror(errno));
      return 0;
    }
  } while(0);
  mp_msg(MSGT_STREAM,MSGL_DBG2, "Locked (%d)\n",getpid());
#else
printf("FIXME? should lock here\n");
#endif
  return 1;
}

static int unlock_fd(int fd) {
#if !HAVE_WINSOCK2_H
  struct flock lock;

  memset(&lock,0,sizeof(struct flock));
  lock.l_type = F_UNLCK;

  mp_msg(MSGT_STREAM,MSGL_DBG2, "Unlock (%d)\n",getpid());
  if(fcntl(fd,F_SETLK,&lock)) {
    mp_msg(MSGT_STREAM,MSGL_ERR, "Failed to release the lock: %s\n",
	   strerror(errno));
    return 0;
  }
#else
printf("FIXME? should unlock here\n");
#endif
  return 1;
}

static mp_net_stream_packet_t* send_net_stream_cmd(stream_t *s,uint16_t cmd,char* data,int len) {
  mp_net_stream_packet_t* pack;

  // Cache is enabled : lock
  if(s->cache_data && !lock_fd(s->fd))
    return NULL;
  // Send a command
  if(!write_packet(s->fd,cmd,data,len)) {
    if(s->cache_data) unlock_fd(s->fd);
    return 0;
  }
  // Read the response
  pack = read_packet(s->fd);
  // Now we can unlock
  if(s->cache_data) unlock_fd(s->fd);

  if(!pack)
    return NULL;

  switch(pack->cmd) {
  case NET_STREAM_OK:
    return pack;
  case NET_STREAM_ERROR:
    if(pack->len > sizeof(mp_net_stream_packet_t))
      mp_msg(MSGT_STREAM,MSGL_ERR, "Fill buffer failed: %s\n",pack->data);
    else
      mp_msg(MSGT_STREAM,MSGL_ERR, "Fill buffer failed\n");
    free(pack);
    return NULL;
  }
  
  mp_msg(MSGT_STREAM,MSGL_ERR, "Unknown response to %d: %d\n",cmd,pack->cmd);
  free(pack);
  return NULL;
}

static int fill_buffer(stream_t *s, char* buffer, int max_len){
  uint16_t len = le2me_16(max_len);
  mp_net_stream_packet_t* pack;

  pack = send_net_stream_cmd(s,NET_STREAM_FILL_BUFFER,(char*)&len,2);
  if(!pack) {
    return -1;
  }
  len = pack->len - sizeof(mp_net_stream_packet_t);
  if(len > max_len) {
    mp_msg(MSGT_STREAM,MSGL_ERR, "Got a too big a packet %d / %d\n",len,max_len);
    free(pack);
    return 0;
  }
  if(len > 0)
    memcpy(buffer,pack->data,len);
  free(pack);
  return len;
}


static int seek(stream_t *s,off_t newpos) {
  uint64_t pos = le2me_64((uint64_t)newpos);
  mp_net_stream_packet_t* pack;
  
  pack = send_net_stream_cmd(s,NET_STREAM_SEEK,(char*)&pos,8);
  if(!pack) {    
    return 0;
  }
  s->pos = newpos;
  free(pack);
  return 1;
}

static int net_stream_reset(struct stream_st *s) {
  mp_net_stream_packet_t* pack;
  
  pack = send_net_stream_cmd(s,NET_STREAM_RESET,NULL,0);  
  if(!pack) {
    return 0;
  }
  free(pack);
  return 1;
}
 
static int control(struct stream_st *s,int cmd,void* arg) {
  switch(cmd) {
  case STREAM_CTRL_RESET:
    return net_stream_reset(s);
  }
  return STREAM_UNSUPPORTED;
}

static void close_s(struct stream_st *s) {
  mp_net_stream_packet_t* pack;
  
  pack = send_net_stream_cmd(s,NET_STREAM_CLOSE,NULL,0);
  if(pack)
    free(pack);
}

static int open_s(stream_t *stream,int mode, void* opts, int* file_format) {
  int f;
  struct stream_priv_s* p = (struct stream_priv_s*)opts;
  mp_net_stream_packet_t* pack;
  mp_net_stream_opened_t* opened;

  if(mode != STREAM_READ)
    return STREAM_UNSUPPORTED;

  if(!p->host) {
    mp_msg(MSGT_OPEN,MSGL_ERR, "We need an host name (ex: mpst://server.net/cdda://5)\n");
    m_struct_free(&stream_opts,opts);
    return STREAM_ERROR;
  }
  if(!p->url || strlen(p->url) == 0) {
    mp_msg(MSGT_OPEN,MSGL_ERR, "We need a remote url (ex: mpst://server.net/cdda://5)\n");
    m_struct_free(&stream_opts,opts);
    return STREAM_ERROR;
  }

  f = connect2Server(p->host,p->port,1);
  if(f < 0) {
    mp_msg(MSGT_OPEN,MSGL_ERR, "Connection to %s:%d failed\n",p->host,p->port);
    m_struct_free(&stream_opts,opts);
    return STREAM_ERROR;
  }
  stream->fd = f;
  /// Now send an open command
  pack = send_net_stream_cmd(stream,NET_STREAM_OPEN,p->url,strlen(p->url) + 1);
  if(!pack) {
    goto error;
  }
  
  if(pack->len != sizeof(mp_net_stream_packet_t) + 
     sizeof(mp_net_stream_opened_t)) {
    mp_msg(MSGT_OPEN,MSGL_ERR, "Invalid open response packet len (%d bytes)\n",pack->len);
    free(pack);
    goto error;
  }
  
  opened = (mp_net_stream_opened_t*)pack->data;
  net_stream_opened_2_me(opened);

  *file_format = opened->file_format;
  stream->flags = opened->flags;
  stream->sector_size = opened->sector_size;
  stream->start_pos = opened->start_pos;
  stream->end_pos = opened->end_pos;

  stream->fill_buffer = fill_buffer;
  stream->control = control;
  if(stream->flags & STREAM_SEEK)
    stream->seek = seek;
  stream->close = close_s;

  free(pack);
  m_struct_free(&stream_opts,opts);

  return STREAM_OK;

  error:
  closesocket(f);
  m_struct_free(&stream_opts,opts);
  return STREAM_ERROR;
}

const stream_info_t stream_info_netstream = {
  "Net stream",
  "netstream",
  "Albeu",
  "",
  open_s,
  { "mpst",NULL },
  &stream_opts,
  1 // Url is an option string
};