1 /*****************************************************************************
2 * mjpeg.c : demuxes mjpeg webcam http streams
3 *****************************************************************************
4 * Copyright (C) 2004 the VideoLAN team
7 * Authors: Henry Jen (slowhog) <henryjen@ztune.net>
8 * Derk-Jan Hartman (thedj)
9 * Sigmund Augdal (Dnumgis)
10 * Laurent Aimar <fenrir@via.ecp.fr>
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
25 *****************************************************************************/
27 /*****************************************************************************
29 *****************************************************************************/
35 #include <vlc_common.h>
36 #include <vlc_plugin.h>
37 #include <vlc_demux.h>
39 /*****************************************************************************
41 *****************************************************************************/
42 static int Open ( vlc_object_t
* );
43 static void Close( vlc_object_t
* );
45 #define FPS_TEXT N_("Frames per Second")
46 #define FPS_LONGTEXT N_("This is the desired frame rate when " \
47 "playing MJPEG from a file. Use 0 (this is the default value) for a " \
48 "live stream (from a camera).")
51 set_shortname( "MJPEG")
52 set_description( N_("M-JPEG camera demuxer") )
53 set_capability( "demux", 5 )
54 set_callbacks( Open
, Close
)
55 set_category( CAT_INPUT
)
56 set_subcategory( SUBCAT_INPUT_DEMUX
)
57 add_float( "mjpeg-fps", 0.0, FPS_TEXT
, FPS_LONGTEXT
, false )
60 /*****************************************************************************
62 *****************************************************************************/
63 static int MimeDemux( demux_t
* );
64 static int MjpgDemux( demux_t
* );
65 static int Control( demux_t
*, int i_query
, va_list args
);
74 mtime_t i_still_length
;
77 mtime_t i_frame_length
;
79 int i_frame_size_estimate
;
80 const uint8_t *p_peek
;
85 /*****************************************************************************
86 * Peek: Helper function to peek data with incremental size.
87 * \return false if peek no more data, true otherwise.
88 *****************************************************************************/
89 static bool Peek( demux_t
*p_demux
, bool b_first
)
92 demux_sys_t
*p_sys
= p_demux
->p_sys
;
96 p_sys
->i_data_peeked
= 0;
98 else if( p_sys
->i_data_peeked
== p_sys
->i_frame_size_estimate
)
100 p_sys
->i_frame_size_estimate
+= 5120;
102 i_data
= stream_Peek( p_demux
->s
, &p_sys
->p_peek
,
103 p_sys
->i_frame_size_estimate
);
104 if( i_data
== p_sys
->i_data_peeked
)
106 msg_Warn( p_demux
, "no more data" );
109 p_sys
->i_data_peeked
= i_data
;
112 msg_Warn( p_demux
, "cannot peek data" );
118 /*****************************************************************************
119 * GetLine: Internal function used to dup a line of string from the buffer
120 *****************************************************************************/
121 static char* GetLine( demux_t
*p_demux
, int *p_pos
)
123 demux_sys_t
*p_sys
= p_demux
->p_sys
;
124 const uint8_t *p_buf
;
129 while( *p_pos
>= p_sys
->i_data_peeked
)
131 if( ! Peek( p_demux
, false ) )
136 p_buf
= p_sys
->p_peek
+ *p_pos
;
137 i_size
= p_sys
->i_data_peeked
- *p_pos
;
139 while( p_buf
[i
] != '\n' )
144 if( ! Peek( p_demux
, false ) )
148 p_buf
= p_sys
->p_peek
+ *p_pos
;
149 i_size
= p_sys
->i_data_peeked
- *p_pos
;
153 if( i
> 0 && '\r' == p_buf
[i
- 1] )
157 p_line
= malloc( i
+ 1 );
160 strncpy ( p_line
, (char*)p_buf
, i
);
162 // msg_Dbg( p_demux, "i = %d, pos = %d, %s", i, *p_pos, p_line );
166 /*****************************************************************************
167 * CheckMimeHeader: Internal function used to verify and skip mime header
168 * \param p_header_size Return size of MIME header, 0 if no MIME header
169 * detected, minus value if error
170 * \return true if content type is image/jpeg, false otherwise
171 *****************************************************************************/
172 static bool CheckMimeHeader( demux_t
*p_demux
, int *p_header_size
)
178 demux_sys_t
*p_sys
= p_demux
->p_sys
;
180 if( !Peek( p_demux
, true ) )
182 msg_Err( p_demux
, "cannot peek" );
186 if( p_sys
->i_data_peeked
< 5)
188 msg_Err( p_demux
, "data shortage" );
192 if( strncmp( (char *)p_sys
->p_peek
, "--", 2 ) != 0
193 && strncmp( (char *)p_sys
->p_peek
, "\r\n--", 4 ) != 0 )
198 i_pos
= *p_sys
->p_peek
== '-' ? 2 : 4;
199 psz_line
= GetLine( p_demux
, &i_pos
);
200 if( NULL
== psz_line
)
202 msg_Err( p_demux
, "no EOL" );
207 /* Read the separator and remember it if not yet stored */
208 if( p_sys
->psz_separator
== NULL
)
210 p_sys
->psz_separator
= psz_line
;
211 msg_Dbg( p_demux
, "Multipart MIME detected, using separator: %s",
212 p_sys
->psz_separator
);
216 if( strcmp( psz_line
, p_sys
->psz_separator
) )
218 msg_Warn( p_demux
, "separator %s does not match %s", psz_line
,
219 p_sys
->psz_separator
);
224 psz_line
= GetLine( p_demux
, &i_pos
);
225 while( psz_line
&& *psz_line
)
227 if( !strncasecmp( psz_line
, "Content-Type:", 13 ) )
229 p_ch
= psz_line
+ 13;
230 while( *p_ch
!= '\0' && ( *p_ch
== ' ' || *p_ch
== '\t' ) ) p_ch
++;
231 if( strncasecmp( p_ch
, "image/jpeg", 10 ) )
233 msg_Warn( p_demux
, "%s, image/jpeg is expected", psz_line
);
243 msg_Dbg( p_demux
, "discard MIME header: %s", psz_line
);
246 psz_line
= GetLine( p_demux
, &i_pos
);
249 if( NULL
== psz_line
)
251 msg_Err( p_demux
, "no EOL" );
258 *p_header_size
= i_pos
;
262 static int SendBlock( demux_t
*p_demux
, int i
)
264 demux_sys_t
*p_sys
= p_demux
->p_sys
;
267 if( ( p_block
= stream_Block( p_demux
->s
, i
) ) == NULL
)
269 msg_Warn( p_demux
, "cannot read data" );
273 if( !p_sys
->i_frame_length
|| !p_sys
->i_time
)
275 p_sys
->i_time
= p_block
->i_dts
= p_block
->i_pts
= mdate();
279 p_block
->i_dts
= p_block
->i_pts
= VLC_TS_0
+ p_sys
->i_time
;
280 p_sys
->i_time
+= p_sys
->i_frame_length
;
284 es_out_Control( p_demux
->out
, ES_OUT_SET_PCR
, p_block
->i_pts
);
285 es_out_Send( p_demux
->out
, p_sys
->p_es
, p_block
);
289 p_sys
->i_still_end
= mdate() + p_sys
->i_still_length
;
295 /*****************************************************************************
296 * Open: check file and initializes structures
297 *****************************************************************************/
298 static int Open( vlc_object_t
* p_this
)
300 demux_t
*p_demux
= (demux_t
*)p_this
;
303 bool b_matched
= false;
306 p_sys
= malloc( sizeof( demux_sys_t
) );
307 if( unlikely(p_sys
== NULL
) )
310 p_demux
->pf_control
= Control
;
311 p_demux
->p_sys
= p_sys
;
316 p_sys
->psz_separator
= NULL
;
317 p_sys
->i_frame_size_estimate
= 15 * 1024;
319 b_matched
= CheckMimeHeader( p_demux
, &i_size
);
322 p_demux
->pf_demux
= MimeDemux
;
323 stream_Read( p_demux
->s
, NULL
, i_size
);
325 else if( 0 == i_size
)
327 /* 0xffd8 identify a JPEG SOI */
328 if( p_sys
->p_peek
[0] == 0xFF && p_sys
->p_peek
[1] == 0xD8 )
330 msg_Dbg( p_demux
, "JPEG SOI marker detected" );
331 p_demux
->pf_demux
= MjpgDemux
;
345 f_fps
= var_CreateGetFloat( p_demux
, "mjpeg-fps" );
346 p_sys
->i_frame_length
= 0;
348 /* Check for jpeg file extension */
349 p_sys
->b_still
= false;
350 p_sys
->i_still_end
= 0;
351 if( demux_IsPathExtension( p_demux
, ".jpeg" ) ||
352 demux_IsPathExtension( p_demux
, ".jpg" ) )
354 p_sys
->b_still
= true;
357 p_sys
->i_still_length
= 1000000.0 / f_fps
;
361 /* Defaults to 1fps */
362 p_sys
->i_still_length
= 1000000;
367 p_sys
->i_frame_length
= 1000000.0 / f_fps
;
370 es_format_Init( &p_sys
->fmt
, VIDEO_ES
, 0 );
371 p_sys
->fmt
.i_codec
= VLC_CODEC_MJPG
;
373 p_sys
->p_es
= es_out_Add( p_demux
->out
, &p_sys
->fmt
);
381 /*****************************************************************************
382 * Demux: read packet and send them to decoders
383 *****************************************************************************
384 * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
385 *****************************************************************************/
386 static int MjpgDemux( demux_t
*p_demux
)
388 demux_sys_t
*p_sys
= p_demux
->p_sys
;
391 if( p_sys
->b_still
&& p_sys
->i_still_end
)
393 /* Still frame, wait until the pause delay is gone */
394 mwait( p_sys
->i_still_end
);
395 p_sys
->i_still_end
= 0;
399 if( !Peek( p_demux
, true ) )
401 msg_Warn( p_demux
, "cannot peek data" );
404 if( p_sys
->i_data_peeked
< 4 )
406 msg_Warn( p_demux
, "data shortage" );
411 while( !( 0xFF == p_sys
->p_peek
[i
-1] && 0xD9 == p_sys
->p_peek
[i
] ) )
413 if( 0xFF == p_sys
->p_peek
[i
-1] && 0xD8 == p_sys
->p_peek
[i
] )
416 msg_Dbg( p_demux
, "we found another JPEG SOI at %d", i
);
419 if( i
>= p_sys
->i_data_peeked
)
421 msg_Dbg( p_demux
, "did not find JPEG EOI in %d bytes",
422 p_sys
->i_data_peeked
);
423 if( !Peek( p_demux
, false ) )
425 msg_Warn( p_demux
, "no more data is available at the moment" );
432 msg_Dbg( p_demux
, "JPEG EOI detected at %d", i
);
435 if( p_sys
->i_level
> 0 )
437 return SendBlock( p_demux
, i
);
440 static int MimeDemux( demux_t
*p_demux
)
442 demux_sys_t
*p_sys
= p_demux
->p_sys
;
445 bool b_match
= CheckMimeHeader( p_demux
, &i_size
);
449 stream_Read( p_demux
->s
, NULL
, i_size
);
451 else if( i_size
< 0 )
457 // No MIME header, assume OK
461 if( !Peek( p_demux
, true ) )
463 msg_Warn( p_demux
, "cannot peek data" );
468 i_size
= strlen( p_sys
->psz_separator
) + 2;
469 if( p_sys
->i_data_peeked
< i_size
)
471 msg_Warn( p_demux
, "data shortage" );
477 while( !( p_sys
->p_peek
[i
] == '-' && p_sys
->p_peek
[i
+1] == '-' ) )
481 if( i_size
>= p_sys
->i_data_peeked
)
483 msg_Dbg( p_demux
, "MIME boundary not found in %d bytes of "
484 "data", p_sys
->i_data_peeked
);
486 if( !Peek( p_demux
, false ) )
488 msg_Warn( p_demux
, "no more data is available at the "
495 if( !strncmp( p_sys
->psz_separator
, (char *)(p_sys
->p_peek
+ i
+ 2),
496 strlen( p_sys
->psz_separator
) ) )
507 msg_Err( p_demux
, "discard non-JPEG part" );
508 stream_Read( p_demux
->s
, NULL
, i
);
512 return SendBlock( p_demux
, i
);
515 /*****************************************************************************
516 * Close: frees unused data
517 *****************************************************************************/
518 static void Close ( vlc_object_t
* p_this
)
520 demux_t
*p_demux
= (demux_t
*)p_this
;
521 demux_sys_t
*p_sys
= p_demux
->p_sys
;
523 free( p_sys
->psz_separator
);
527 /*****************************************************************************
529 *****************************************************************************/
530 static int Control( demux_t
*p_demux
, int i_query
, va_list args
)
532 return demux_vaControlHelper( p_demux
->s
, 0, 0, 0, 0, i_query
, args
);