1 /*****************************************************************************
2 * mjpeg.c : demuxes mjpeg webcam http streams
3 *****************************************************************************
4 * Copyright (C) 2004 VLC authors and VideoLAN
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 it
13 * under the terms of the GNU Lesser General Public License as published by
14 * the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
22 * You should have received a copy of the GNU Lesser General Public License
23 * along with this program; if not, write to the Free Software Foundation,
24 * 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>
38 #include "mxpeg_helper.h"
40 /*****************************************************************************
42 *****************************************************************************/
43 static int Open ( vlc_object_t
* );
44 static void Close( vlc_object_t
* );
46 #define FPS_TEXT N_("Frames per Second")
47 #define FPS_LONGTEXT N_("This is the desired frame rate when " \
48 "playing MJPEG from a file. Use 0 (this is the default value) for a " \
49 "live stream (from a camera).")
52 set_shortname( "MJPEG")
53 set_description( N_("M-JPEG camera demuxer") )
54 set_capability( "demux", 5 )
55 set_callbacks( Open
, Close
)
56 set_category( CAT_INPUT
)
57 set_subcategory( SUBCAT_INPUT_DEMUX
)
58 add_float( "mjpeg-fps", 0.0, FPS_TEXT
, FPS_LONGTEXT
, false )
61 /*****************************************************************************
63 *****************************************************************************/
64 static int MimeDemux( demux_t
* );
65 static int MjpgDemux( demux_t
* );
66 static int Control( demux_t
*, int i_query
, va_list args
);
76 mtime_t i_frame_length
;
78 int i_frame_size_estimate
;
79 const uint8_t *p_peek
;
84 /*****************************************************************************
85 * Peek: Helper function to peek data with incremental size.
86 * \return false if peek no more data, true otherwise.
87 *****************************************************************************/
88 static bool Peek( demux_t
*p_demux
, bool b_first
)
91 demux_sys_t
*p_sys
= p_demux
->p_sys
;
95 p_sys
->i_data_peeked
= 0;
97 else if( p_sys
->i_data_peeked
== p_sys
->i_frame_size_estimate
)
99 p_sys
->i_frame_size_estimate
+= 5120;
101 i_data
= vlc_stream_Peek( p_demux
->s
, &p_sys
->p_peek
,
102 p_sys
->i_frame_size_estimate
);
103 if( i_data
== p_sys
->i_data_peeked
)
105 msg_Warn( p_demux
, "no more data" );
108 p_sys
->i_data_peeked
= i_data
;
111 msg_Warn( p_demux
, "cannot peek data" );
117 /*****************************************************************************
118 * GetLine: Internal function used to dup a line of string from the buffer
119 *****************************************************************************/
120 static char* GetLine( demux_t
*p_demux
, int *p_pos
)
122 demux_sys_t
*p_sys
= p_demux
->p_sys
;
123 const uint8_t *p_buf
;
128 while( *p_pos
>= p_sys
->i_data_peeked
)
130 if( ! Peek( p_demux
, false ) )
135 p_buf
= p_sys
->p_peek
+ *p_pos
;
136 i_size
= p_sys
->i_data_peeked
- *p_pos
;
138 while( p_buf
[i
] != '\n' )
143 if( ! Peek( p_demux
, false ) )
147 p_buf
= p_sys
->p_peek
+ *p_pos
;
148 i_size
= p_sys
->i_data_peeked
- *p_pos
;
152 if( i
> 0 && p_buf
[i
- 1] == '\r' )
156 p_line
= malloc( i
+ 1 );
157 if( unlikely( p_line
== NULL
) )
159 strncpy ( p_line
, (char*)p_buf
, i
);
164 /*****************************************************************************
165 * CheckMimeHeader: Internal function used to verify and skip mime header
166 * \param p_header_size Return size of MIME header, 0 if no MIME header
167 * detected, minus value if error
168 * \return true if content type is image/jpeg, false otherwise
169 *****************************************************************************/
170 static bool CheckMimeHeader( demux_t
*p_demux
, int *p_header_size
)
176 demux_sys_t
*p_sys
= p_demux
->p_sys
;
179 if( !Peek( p_demux
, true ) )
181 msg_Err( p_demux
, "cannot peek" );
184 if( p_sys
->i_data_peeked
< 5)
186 msg_Err( p_demux
, "data shortage" );
189 if( strncmp( (char *)p_sys
->p_peek
, "--", 2 ) != 0
190 && strncmp( (char *)p_sys
->p_peek
, "\r\n--", 4 ) != 0 )
197 i_pos
= *p_sys
->p_peek
== '-' ? 2 : 4;
198 psz_line
= GetLine( p_demux
, &i_pos
);
199 if( NULL
== psz_line
)
201 msg_Err( p_demux
, "no EOL" );
205 /* Read the separator and remember it if not yet stored */
206 if( p_sys
->psz_separator
== NULL
)
208 p_sys
->psz_separator
= psz_line
;
209 msg_Dbg( p_demux
, "Multipart MIME detected, using separator: %s",
210 p_sys
->psz_separator
);
214 if( strcmp( psz_line
, p_sys
->psz_separator
) )
216 msg_Warn( p_demux
, "separator %s does not match %s", psz_line
,
217 p_sys
->psz_separator
);
223 psz_line
= GetLine( p_demux
, &i_pos
);
224 while( psz_line
&& *psz_line
)
226 if( !strncasecmp( psz_line
, "Content-Type:", 13 ) )
228 p_ch
= psz_line
+ 13;
229 while( *p_ch
!= '\0' && ( *p_ch
== ' ' || *p_ch
== '\t' ) ) p_ch
++;
230 if( strncasecmp( p_ch
, "image/jpeg", 10 ) )
232 msg_Warn( p_demux
, "%s, image/jpeg is expected", psz_line
);
242 msg_Dbg( p_demux
, "discard MIME header: %s", psz_line
);
245 psz_line
= GetLine( p_demux
, &i_pos
);
248 if( NULL
== psz_line
)
250 msg_Err( p_demux
, "no EOL" );
256 *p_header_size
= i_pos
;
260 static int SendBlock( demux_t
*p_demux
, int i
)
262 demux_sys_t
*p_sys
= p_demux
->p_sys
;
265 if( ( p_block
= vlc_stream_Block( p_demux
->s
, i
) ) == NULL
)
267 msg_Warn( p_demux
, "cannot read data" );
271 if( p_sys
->i_frame_length
)
273 p_block
->i_pts
= p_sys
->i_time
;
274 p_sys
->i_time
+= p_sys
->i_frame_length
;
278 p_block
->i_pts
= mdate();
280 p_block
->i_dts
= p_block
->i_pts
;
283 es_out_SetPCR( p_demux
->out
, p_block
->i_pts
);
284 es_out_Send( p_demux
->out
, p_sys
->p_es
, p_block
);
287 p_sys
->i_still_end
= mdate() + p_sys
->i_frame_length
;
292 /*****************************************************************************
293 * Open: check file and initializes structures
294 *****************************************************************************/
295 static int Open( vlc_object_t
* p_this
)
297 demux_t
*p_demux
= (demux_t
*)p_this
;
299 bool b_matched
= false;
301 if( IsMxpeg( p_demux
->s
) && !p_demux
->obj
.force
)
302 // let avformat handle this case
305 demux_sys_t
*p_sys
= malloc( sizeof( demux_sys_t
) );
306 if( unlikely(p_sys
== NULL
) )
309 p_demux
->pf_control
= Control
;
310 p_demux
->p_sys
= p_sys
;
312 p_sys
->i_time
= VLC_TS_0
;
315 p_sys
->psz_separator
= NULL
;
316 p_sys
->i_frame_size_estimate
= 15 * 1024;
318 char *content_type
= stream_ContentType( p_demux
->s
);
321 //FIXME: this is not fully match to RFC
322 char* boundary
= strstr( content_type
, "boundary=" );
325 boundary
+= strlen( "boundary=" );
326 size_t len
= strlen( boundary
);
327 if( len
> 2 && boundary
[0] == '"'
328 && boundary
[len
-1] == '"' )
330 boundary
[len
-1] = '\0';
333 p_sys
->psz_separator
= strdup( boundary
);
334 if( !p_sys
->psz_separator
)
336 free( content_type
);
340 free( content_type
);
343 b_matched
= CheckMimeHeader( p_demux
, &i_size
);
346 p_demux
->pf_demux
= MimeDemux
;
347 if( vlc_stream_Read( p_demux
->s
, NULL
, i_size
) < i_size
)
350 else if( i_size
== 0 )
352 /* 0xffd8 identify a JPEG SOI */
353 if( p_sys
->p_peek
[0] == 0xFF && p_sys
->p_peek
[1] == 0xD8 )
355 msg_Dbg( p_demux
, "JPEG SOI marker detected" );
356 p_demux
->pf_demux
= MjpgDemux
;
370 float f_fps
= var_InheritFloat( p_demux
, "mjpeg-fps" );
372 p_sys
->i_still_end
= 0;
373 if( demux_IsPathExtension( p_demux
, ".jpeg" ) ||
374 demux_IsPathExtension( p_demux
, ".jpg" ) )
376 /* Plain JPEG file = single still picture */
377 p_sys
->b_still
= true;
379 /* Defaults to 1fps */
383 p_sys
->b_still
= false;
384 p_sys
->i_frame_length
= f_fps
? (CLOCK_FREQ
/ f_fps
) : 0;
386 es_format_Init( &p_sys
->fmt
, VIDEO_ES
, VLC_CODEC_MJPG
);
388 p_sys
->p_es
= es_out_Add( p_demux
->out
, &p_sys
->fmt
);
392 free( p_sys
->psz_separator
);
397 /*****************************************************************************
398 * Demux: read packet and send them to decoders
399 *****************************************************************************
400 * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
401 *****************************************************************************/
402 static int MjpgDemux( demux_t
*p_demux
)
404 demux_sys_t
*p_sys
= p_demux
->p_sys
;
407 if( p_sys
->b_still
&& p_sys
->i_still_end
)
409 /* Still frame, wait until the pause delay is gone */
410 mwait( p_sys
->i_still_end
);
411 p_sys
->i_still_end
= 0;
415 if( !Peek( p_demux
, true ) )
417 msg_Warn( p_demux
, "cannot peek data" );
420 if( p_sys
->i_data_peeked
< 4 )
422 msg_Warn( p_demux
, "data shortage" );
427 while( !( p_sys
->p_peek
[i
-1] == 0xFF && p_sys
->p_peek
[i
] == 0xD9 ) )
429 if( p_sys
->p_peek
[i
-1] == 0xFF && p_sys
->p_peek
[i
] == 0xD9 )
432 msg_Dbg( p_demux
, "we found another JPEG SOI at %d", i
);
435 if( i
>= p_sys
->i_data_peeked
)
437 msg_Dbg( p_demux
, "did not find JPEG EOI in %d bytes",
438 p_sys
->i_data_peeked
);
439 if( !Peek( p_demux
, false ) )
441 msg_Warn( p_demux
, "no more data is available at the moment" );
448 msg_Dbg( p_demux
, "JPEG EOI detected at %d", i
);
451 if( p_sys
->i_level
> 0 )
453 return SendBlock( p_demux
, i
);
456 static int MimeDemux( demux_t
*p_demux
)
458 demux_sys_t
*p_sys
= p_demux
->p_sys
;
461 bool b_match
= CheckMimeHeader( p_demux
, &i_size
);
465 if( vlc_stream_Read( p_demux
->s
, NULL
, i_size
) != i_size
)
468 else if( i_size
< 0 )
474 // No MIME header, assume OK
478 if( !Peek( p_demux
, true ) )
480 msg_Warn( p_demux
, "cannot peek data" );
485 i_size
= strlen( p_sys
->psz_separator
) + 2;
486 if( p_sys
->i_data_peeked
< i_size
)
488 msg_Warn( p_demux
, "data shortage" );
494 while( !( p_sys
->p_peek
[i
] == '-' && p_sys
->p_peek
[i
+1] == '-' ) )
498 if( i_size
>= p_sys
->i_data_peeked
)
500 msg_Dbg( p_demux
, "MIME boundary not found in %d bytes of "
501 "data", p_sys
->i_data_peeked
);
503 if( !Peek( p_demux
, false ) )
505 msg_Warn( p_demux
, "no more data is available at the "
512 /* Handle old and new style of separators */
513 if (!strncmp(p_sys
->psz_separator
, (char *)(p_sys
->p_peek
+ i
+ 2),
514 strlen( p_sys
->psz_separator
))
515 || ((strlen(p_sys
->psz_separator
) > 4)
516 && !strncmp(p_sys
->psz_separator
, "--", 2)
517 && !strncmp(p_sys
->psz_separator
, (char *)(p_sys
->p_peek
+ i
),
518 strlen( p_sys
->psz_separator
))))
529 msg_Err( p_demux
, "discard non-JPEG part" );
533 return SendBlock( p_demux
, i
);
536 /*****************************************************************************
537 * Close: frees unused data
538 *****************************************************************************/
539 static void Close ( vlc_object_t
* p_this
)
541 demux_t
*p_demux
= (demux_t
*)p_this
;
542 demux_sys_t
*p_sys
= p_demux
->p_sys
;
544 free( p_sys
->psz_separator
);
548 /*****************************************************************************
550 *****************************************************************************/
551 static int Control( demux_t
*p_demux
, int i_query
, va_list args
)
553 return demux_vaControlHelper( p_demux
->s
, 0, 0, 0, 0, i_query
, args
);