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access_output/udp.c: use block_Fifo for the empty blocks list. Simplifies code a lot
[vlc] / modules / access_output / udp.c
1 /*****************************************************************************
2  * udp.c
3  *****************************************************************************
4  * Copyright (C) 2001-2005 the VideoLAN team
5  * $Id$
6  *
7  * Authors: Laurent Aimar <fenrir@via.ecp.fr>
8  *          Eric Petit <titer@videolan.org>
9  *
10  * This program is free software; you can redistribute it and/or modify
11  * it under the terms of the GNU General Public License as published by
12  * the Free Software Foundation; either version 2 of the License, or
13  * (at your option) any later version.
14  *
15  * This program is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18  * GNU General Public License for more details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with this program; if not, write to the Free Software
22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
23  *****************************************************************************/
24
25 /*****************************************************************************
26  * Preamble
27  *****************************************************************************/
28 #include <stdlib.h>
29 #include <sys/types.h>
30 #include <sys/stat.h>
31 #include <string.h>
32 #include <errno.h>
33 #include <fcntl.h>
34
35 #include <vlc/vlc.h>
36 #include <vlc/sout.h>
37
38 #ifdef HAVE_UNISTD_H
39 #   include <unistd.h>
40 #endif
41
42 #ifdef WIN32
43 #   include <winsock2.h>
44 #   include <ws2tcpip.h>
45 #   ifndef IN_MULTICAST
46 #       define IN_MULTICAST(a) IN_CLASSD(a)
47 #   endif
48 #else
49 #   include <sys/socket.h>
50 #endif
51
52 #include "network.h"
53
54 #define MAX_EMPTY_BLOCKS 200
55
56 #if defined(WIN32) || defined(UNDER_CE)
57 # define WINSOCK_STRERROR_SIZE 20
58 static const char *winsock_strerror( char *buf )
59 {
60     snprintf( buf, WINSOCK_STRERROR_SIZE, "Winsock error %d",
61               WSAGetLastError( ) );
62     buf[WINSOCK_STRERROR_SIZE - 1] = '\0';
63     return buf;
64 }
65 #endif
66
67 /*****************************************************************************
68  * Module descriptor
69  *****************************************************************************/
70 static int  Open ( vlc_object_t * );
71 static void Close( vlc_object_t * );
72
73 #define SOUT_CFG_PREFIX "sout-udp-"
74
75 #define CACHING_TEXT N_("Caching value (ms)")
76 #define CACHING_LONGTEXT N_( \
77     "Allows you to modify the default caching value for UDP streams. This " \
78     "value should be set in millisecond units." )
79
80 #define TTL_TEXT N_("Time-To-Live (TTL)")
81 #define TTL_LONGTEXT N_("Allows you to define the Time-To-Live of the " \
82                         "outgoing stream.")
83
84 #define GROUP_TEXT N_("Group packets")
85 #define GROUP_LONGTEXT N_("Packets can be sent one by one at the right time " \
86                           "or by groups. This allows you to give the number " \
87                           "of packets that will be sent at a time. It " \
88                           "helps reducing the scheduling load on " \
89                           "heavily-loaded systems." )
90 #define RAW_TEXT N_("Raw write")
91 #define RAW_LONGTEXT N_("If you enable this option, packets will be sent " \
92                        "directly, without trying to fill the MTU (ie, " \
93                        "without trying to make the biggest possible packets " \
94                        "in order to improve streaming)." )
95
96 vlc_module_begin();
97     set_description( _("UDP stream output") );
98     set_shortname( N_( "UDP" ) );
99     set_category( CAT_SOUT );
100     set_subcategory( SUBCAT_SOUT_ACO );
101     add_integer( SOUT_CFG_PREFIX "caching", DEFAULT_PTS_DELAY / 1000, NULL, CACHING_TEXT, CACHING_LONGTEXT, VLC_TRUE );
102     add_integer( SOUT_CFG_PREFIX "ttl", 0, NULL,TTL_TEXT, TTL_LONGTEXT,
103                                  VLC_TRUE );
104     add_integer( SOUT_CFG_PREFIX "group", 1, NULL, GROUP_TEXT, GROUP_LONGTEXT,
105                                  VLC_TRUE );
106     add_suppressed_integer( SOUT_CFG_PREFIX "late" );
107     add_bool( SOUT_CFG_PREFIX "raw",  0, NULL, RAW_TEXT, RAW_LONGTEXT,
108                                  VLC_TRUE );
109
110     set_capability( "sout access", 100 );
111     add_shortcut( "udp" );
112     add_shortcut( "rtp" ); // Will work only with ts muxer
113     set_callbacks( Open, Close );
114 vlc_module_end();
115
116 /*****************************************************************************
117  * Exported prototypes
118  *****************************************************************************/
119
120 static const char *ppsz_sout_options[] = {
121     "caching",
122     "ttl",
123     "group",
124     "raw",
125     NULL
126 };
127
128 static int  Write   ( sout_access_out_t *, block_t * );
129 static int  WriteRaw( sout_access_out_t *, block_t * );
130 static int  Seek    ( sout_access_out_t *, off_t  );
131
132 static void ThreadWrite( vlc_object_t * );
133 static block_t *NewUDPPacket( sout_access_out_t *, mtime_t );
134
135 typedef struct sout_access_thread_t
136 {
137     VLC_COMMON_MEMBERS
138
139     sout_instance_t *p_sout;
140
141     block_fifo_t *p_fifo;
142
143     int         i_handle;
144
145     int64_t     i_caching;
146     int         i_group;
147
148     block_fifo_t *p_empty_blocks;
149
150 } sout_access_thread_t;
151
152 struct sout_access_out_sys_t
153 {
154     int                 b_rtpts;  // 1 if add rtp/ts header
155     uint16_t            i_sequence_number;
156     uint32_t            i_ssrc;
157
158     int                 i_mtu;
159
160     block_t             *p_buffer;
161
162     sout_access_thread_t *p_thread;
163
164     vlc_bool_t          b_mtu_warning;
165 };
166
167 #define DEFAULT_PORT 1234
168
169 /*****************************************************************************
170  * Open: open the file
171  *****************************************************************************/
172 static int Open( vlc_object_t *p_this )
173 {
174     sout_access_out_t       *p_access = (sout_access_out_t*)p_this;
175     sout_access_out_sys_t   *p_sys;
176
177     char                *psz_parser;
178     char                *psz_dst_addr;
179     int                 i_dst_port;
180
181     int                 i_handle;
182
183     vlc_value_t         val;
184
185     sout_CfgParse( p_access, SOUT_CFG_PREFIX,
186                    ppsz_sout_options, p_access->p_cfg );
187
188     if( !( p_sys = malloc( sizeof( sout_access_out_sys_t ) ) ) )
189     {
190         msg_Err( p_access, "not enough memory" );
191         return VLC_EGENERIC;
192     }
193     memset( p_sys, 0, sizeof(sout_access_out_sys_t) );
194     p_access->p_sys = p_sys;
195
196     if( p_access->psz_access != NULL &&
197         !strcmp( p_access->psz_access, "rtp" ) )
198     {
199         p_sys->b_rtpts = 1;
200     }
201     else
202     {
203         p_sys->b_rtpts = 0;
204     }
205
206     psz_parser = strdup( p_access->psz_name );
207
208     psz_dst_addr = psz_parser;
209     i_dst_port = 0;
210
211     if ( *psz_parser == '[' )
212     {
213         while( *psz_parser && *psz_parser != ']' )
214         {
215             psz_parser++;
216         }
217     }
218     while( *psz_parser && *psz_parser != ':' )
219     {
220         psz_parser++;
221     }
222     if( *psz_parser == ':' )
223     {
224         *psz_parser = '\0';
225         psz_parser++;
226         i_dst_port = atoi( psz_parser );
227     }
228     if( i_dst_port <= 0 )
229     {
230         i_dst_port = DEFAULT_PORT;
231     }
232
233     p_sys->p_thread =
234         vlc_object_create( p_access, sizeof( sout_access_thread_t ) );
235     if( !p_sys->p_thread )
236     {
237         msg_Err( p_access, "out of memory" );
238         return VLC_EGENERIC;
239     }
240
241     p_sys->p_thread->p_sout = p_access->p_sout;
242     p_sys->p_thread->b_die  = 0;
243     p_sys->p_thread->b_error= 0;
244     p_sys->p_thread->p_fifo = block_FifoNew( p_access );
245     p_sys->p_thread->p_empty_blocks = block_FifoNew( p_access );
246
247     var_Get( p_access, SOUT_CFG_PREFIX "ttl", &val );
248     i_handle = net_ConnectUDP( p_this, psz_dst_addr, i_dst_port, val.i_int );
249     if( i_handle == -1 )
250     {
251          msg_Err( p_access, "failed to open a connection (udp)" );
252          return VLC_EGENERIC;
253     }
254
255     p_sys->p_thread->i_handle = i_handle;
256     net_StopRecv( i_handle );
257
258     var_Get( p_access, SOUT_CFG_PREFIX "caching", &val );
259     p_sys->p_thread->i_caching = (int64_t)val.i_int * 1000;
260
261     var_Get( p_access, SOUT_CFG_PREFIX "group", &val );
262     p_sys->p_thread->i_group = val.i_int;
263
264     p_sys->i_mtu = var_CreateGetInteger( p_this, "mtu" );
265
266     if( vlc_thread_create( p_sys->p_thread, "sout write thread", ThreadWrite,
267                            VLC_THREAD_PRIORITY_HIGHEST, VLC_FALSE ) )
268     {
269         msg_Err( p_access->p_sout, "cannot spawn sout access thread" );
270         vlc_object_destroy( p_sys->p_thread );
271         return VLC_EGENERIC;
272     }
273
274     srand( (uint32_t)mdate());
275     p_sys->p_buffer          = NULL;
276     p_sys->i_sequence_number = rand()&0xffff;
277     p_sys->i_ssrc            = rand()&0xffffffff;
278
279     var_Get( p_access, SOUT_CFG_PREFIX "raw", &val );
280     if( val.b_bool )  p_access->pf_write = WriteRaw;
281     else p_access->pf_write = Write;
282
283     p_access->pf_seek = Seek;
284
285     msg_Dbg( p_access, "udp access output opened(%s:%d)",
286              psz_dst_addr, i_dst_port );
287
288     free( psz_dst_addr );
289
290     /* update p_sout->i_out_pace_nocontrol */
291     p_access->p_sout->i_out_pace_nocontrol++;
292
293     return VLC_SUCCESS;
294 }
295
296 /*****************************************************************************
297  * Close: close the target
298  *****************************************************************************/
299 static void Close( vlc_object_t * p_this )
300 {
301     sout_access_out_t     *p_access = (sout_access_out_t*)p_this;
302     sout_access_out_sys_t *p_sys = p_access->p_sys;
303     int i;
304
305     p_sys->p_thread->b_die = 1;
306     for( i = 0; i < 10; i++ )
307     {
308         block_t *p_dummy = block_New( p_access, p_sys->i_mtu );
309         p_dummy->i_dts = 0;
310         p_dummy->i_pts = 0;
311         p_dummy->i_length = 0;
312         memset( p_dummy->p_buffer, 0, p_dummy->i_buffer );
313         block_FifoPut( p_sys->p_thread->p_fifo, p_dummy );
314     }
315     vlc_thread_join( p_sys->p_thread );
316
317     block_FifoRelease( p_sys->p_thread->p_fifo );
318     block_FifoRelease( p_sys->p_thread->p_empty_blocks );
319
320     if( p_sys->p_buffer ) block_Release( p_sys->p_buffer );
321
322     net_Close( p_sys->p_thread->i_handle );
323
324     vlc_object_destroy( p_sys->p_thread );
325     /* update p_sout->i_out_pace_nocontrol */
326     p_access->p_sout->i_out_pace_nocontrol--;
327
328     msg_Dbg( p_access, "udp access output closed" );
329     free( p_sys );
330 }
331
332 /*****************************************************************************
333  * Write: standard write on a file descriptor.
334  *****************************************************************************/
335 static int Write( sout_access_out_t *p_access, block_t *p_buffer )
336 {
337     sout_access_out_sys_t *p_sys = p_access->p_sys;
338
339     while( p_buffer )
340     {
341         block_t *p_next;
342         int i_packets = 0;
343
344         if( !p_sys->b_mtu_warning && p_buffer->i_buffer > p_sys->i_mtu )
345         {
346             msg_Warn( p_access, "packet size > MTU, you should probably "
347                       "increase the MTU" );
348             p_sys->b_mtu_warning = VLC_TRUE;
349         }
350
351         /* Check if there is enough space in the buffer */
352         if( p_sys->p_buffer &&
353             p_sys->p_buffer->i_buffer + p_buffer->i_buffer > p_sys->i_mtu )
354         {
355             if( p_sys->p_buffer->i_dts + p_sys->p_thread->i_caching < mdate() )
356             {
357                 msg_Dbg( p_access, "late packet for udp input (" I64Fd ")",
358                          mdate() - p_sys->p_buffer->i_dts
359                           - p_sys->p_thread->i_caching );
360             }
361             block_FifoPut( p_sys->p_thread->p_fifo, p_sys->p_buffer );
362             p_sys->p_buffer = NULL;
363         }
364
365         while( p_buffer->i_buffer )
366         {
367             int i_write = __MIN( p_buffer->i_buffer, p_sys->i_mtu );
368
369             i_packets++;
370
371             if( !p_sys->p_buffer )
372             {
373                 p_sys->p_buffer = NewUDPPacket( p_access, p_buffer->i_dts );
374                 if( !p_sys->p_buffer ) break;
375             }
376
377             memcpy( p_sys->p_buffer->p_buffer + p_sys->p_buffer->i_buffer,
378                     p_buffer->p_buffer, i_write );
379
380             p_sys->p_buffer->i_buffer += i_write;
381             p_buffer->p_buffer += i_write;
382             p_buffer->i_buffer -= i_write;
383             if ( p_buffer->i_flags & BLOCK_FLAG_CLOCK )
384             {
385                 if ( p_sys->p_buffer->i_flags & BLOCK_FLAG_CLOCK )
386                     msg_Warn( p_access, "putting two PCRs at once" );
387                 p_sys->p_buffer->i_flags |= BLOCK_FLAG_CLOCK;
388             }
389
390             if( p_sys->p_buffer->i_buffer == p_sys->i_mtu || i_packets > 1 )
391             {
392                 /* Flush */
393                 if( p_sys->p_buffer->i_dts + p_sys->p_thread->i_caching
394                       < mdate() )
395                 {
396                     msg_Dbg( p_access, "late packet for udp input (" I64Fd ")",
397                              mdate() - p_sys->p_buffer->i_dts
398                               - p_sys->p_thread->i_caching );
399                 }
400                 block_FifoPut( p_sys->p_thread->p_fifo, p_sys->p_buffer );
401                 p_sys->p_buffer = NULL;
402             }
403         }
404
405         p_next = p_buffer->p_next;
406         block_Release( p_buffer );
407         p_buffer = p_next;
408     }
409
410     return( p_sys->p_thread->b_error ? -1 : 0 );
411 }
412
413 /*****************************************************************************
414  * WriteRaw: write p_buffer without trying to fill mtu
415  *****************************************************************************/
416 static int WriteRaw( sout_access_out_t *p_access, block_t *p_buffer )
417 {
418     sout_access_out_sys_t   *p_sys = p_access->p_sys;
419     block_t *p_buf;
420
421     while ( p_sys->p_thread->p_empty_blocks->i_depth >= MAX_EMPTY_BLOCKS )
422     {
423         p_buf = block_FifoGet(p_sys->p_thread->p_empty_blocks);
424         block_Release( p_buf );
425     }
426
427     block_FifoPut( p_sys->p_thread->p_fifo, p_buffer );
428
429     return( p_sys->p_thread->b_error ? -1 : 0 );
430 }
431
432 /*****************************************************************************
433  * Seek: seek to a specific location in a file
434  *****************************************************************************/
435 static int Seek( sout_access_out_t *p_access, off_t i_pos )
436 {
437     msg_Err( p_access, "UDP sout access cannot seek" );
438     return -1;
439 }
440
441 /*****************************************************************************
442  * NewUDPPacket: allocate a new UDP packet of size p_sys->i_mtu
443  *****************************************************************************/
444 static block_t *NewUDPPacket( sout_access_out_t *p_access, mtime_t i_dts)
445 {
446     sout_access_out_sys_t *p_sys = p_access->p_sys;
447     block_t *p_buffer;
448
449     while ( p_sys->p_thread->p_empty_blocks->i_depth > MAX_EMPTY_BLOCKS )
450     {
451         p_buffer = block_FifoGet( p_sys->p_thread->p_empty_blocks );
452         block_Release( p_buffer );
453     }
454
455     if( p_sys->p_thread->p_empty_blocks->i_depth == 0 )
456     {
457         p_buffer = block_New( p_access->p_sout, p_sys->i_mtu );
458     }
459     else
460     {
461         p_buffer = block_FifoGet(p_sys->p_thread->p_empty_blocks );       
462         p_buffer->i_flags = 0;
463         p_buffer = block_Realloc( p_buffer, 0, p_sys->i_mtu );
464     }
465
466     p_buffer->i_dts = i_dts;
467     p_buffer->i_buffer = 0;
468
469     if( p_sys->b_rtpts )
470     {
471         mtime_t i_timestamp = p_buffer->i_dts * 9 / 100;
472
473         /* add rtp/ts header */
474         p_buffer->p_buffer[0] = 0x80;
475         p_buffer->p_buffer[1] = 0x21; // mpeg2-ts
476
477         p_buffer->p_buffer[2] = ( p_sys->i_sequence_number >> 8 )&0xff;
478         p_buffer->p_buffer[3] = p_sys->i_sequence_number&0xff;
479         p_sys->i_sequence_number++;
480
481         p_buffer->p_buffer[4] = ( i_timestamp >> 24 )&0xff;
482         p_buffer->p_buffer[5] = ( i_timestamp >> 16 )&0xff;
483         p_buffer->p_buffer[6] = ( i_timestamp >>  8 )&0xff;
484         p_buffer->p_buffer[7] = i_timestamp&0xff;
485
486         p_buffer->p_buffer[ 8] = ( p_sys->i_ssrc >> 24 )&0xff;
487         p_buffer->p_buffer[ 9] = ( p_sys->i_ssrc >> 16 )&0xff;
488         p_buffer->p_buffer[10] = ( p_sys->i_ssrc >>  8 )&0xff;
489         p_buffer->p_buffer[11] = p_sys->i_ssrc&0xff;
490
491         p_buffer->i_buffer = 12;
492     }
493
494     return p_buffer;
495 }
496
497 /*****************************************************************************
498  * ThreadWrite: Write a packet on the network at the good time.
499  *****************************************************************************/
500 static void ThreadWrite( vlc_object_t *p_this )
501 {
502     sout_access_thread_t *p_thread = (sout_access_thread_t*)p_this;
503     mtime_t              i_date_last = -1;
504     mtime_t              i_to_send = p_thread->i_group;
505     int                  i_dropped_packets = 0;
506 #if defined(WIN32) || defined(UNDER_CE)
507     char strerror_buf[WINSOCK_STRERROR_SIZE];
508 # define strerror( x ) winsock_strerror( strerror_buf )
509 #endif
510     int i = 0;
511
512     while( !p_thread->b_die )
513     {
514         block_t *p_pk;
515         mtime_t       i_date, i_sent;
516 #if 0
517         if( (i++ % 1000)==0 ) {
518           int i = 0;
519           block_t *p_tmp = p_thread->p_empty_blocks->p_first;
520           while( p_tmp ) { p_tmp = p_tmp->p_next; i++;}
521           msg_Err( p_thread, "fifo depth: %d, empty blocks: %d/%d",
522                    p_thread->p_fifo->i_depth, p_thread->p_empty_blocks->i_depth,i );
523         }
524 #endif
525         p_pk = block_FifoGet( p_thread->p_fifo );
526
527         i_date = p_thread->i_caching + p_pk->i_dts;
528         if( i_date_last > 0 )
529         {
530             if( i_date - i_date_last > 2000000 )
531             {
532                 if( !i_dropped_packets )
533                     msg_Dbg( p_thread, "mmh, hole ("I64Fd" > 2s) -> drop",
534                              i_date - i_date_last );
535
536                 block_FifoPut( p_thread->p_empty_blocks, p_pk );
537
538                 i_date_last = i_date;
539                 i_dropped_packets++;
540                 continue;
541             }
542             else if( i_date - i_date_last < -1000 )
543             {
544                 if( !i_dropped_packets )
545                     msg_Dbg( p_thread, "mmh, packets in the past ("I64Fd")",
546                              i_date_last - i_date );
547             }
548         }
549
550         i_to_send--;
551         if( !i_to_send || (p_pk->i_flags & BLOCK_FLAG_CLOCK) )
552         {
553             mwait( i_date );
554             i_to_send = p_thread->i_group;
555         }
556         if( send( p_thread->i_handle, p_pk->p_buffer, p_pk->i_buffer, 0 )
557               == -1 )
558         {
559             msg_Warn( p_thread, "send error: %s", strerror(errno) );
560         }
561
562         if( i_dropped_packets )
563         {
564             msg_Dbg( p_thread, "dropped %i packets", i_dropped_packets );
565             i_dropped_packets = 0;
566         }
567
568 #if 1
569         i_sent = mdate();
570         if ( i_sent > i_date + 20000 )
571         {
572             msg_Dbg( p_thread, "packet has been sent too late (" I64Fd ")",
573                      i_sent - i_date );
574         }
575 #endif
576
577         block_FifoPut( p_thread->p_empty_blocks, p_pk );
578
579         i_date_last = i_date;
580     }
581 }