1 /*****************************************************************************
2 * mjpeg.c : demuxes mjpeg webcam http streams
3 *****************************************************************************
4 * Copyright (C) 2004 VideoLAN
5 * $Id: mjpeg.c 7196 2004-03-29 21:29:31Z fenrir $
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., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
25 *****************************************************************************/
27 /*****************************************************************************
29 *****************************************************************************/
30 #include <stdlib.h> /* malloc(), free() */
33 #include <vlc/input.h>
37 /*****************************************************************************
39 *****************************************************************************/
40 static int Open ( vlc_object_t * );
41 static void Close( vlc_object_t * );
43 #define FPS_TEXT N_("Frames per Second")
44 #define FPS_LONGTEXT N_("Allows you to set the desired frame rate when " \
45 "playing from files, use 0 for live.")
48 set_description( _("JPEG camera demuxer") );
49 set_capability( "demux2", 5 );
50 set_callbacks( Open, Close );
51 set_category( CAT_INPUT );
52 set_subcategory( SUBCAT_INPUT_DEMUX );
53 add_float( "mjpeg-fps", 0.0, NULL, FPS_TEXT, FPS_LONGTEXT, VLC_FALSE );
56 /*****************************************************************************
58 *****************************************************************************/
59 static int MimeDemux( demux_t * );
60 static int MjpgDemux( demux_t * );
61 static int Control( demux_t *, int i_query, va_list args );
70 mtime_t i_still_length;
73 mtime_t i_frame_length;
75 int i_frame_size_estimate;
80 /*****************************************************************************
81 * Peek: Helper function to peek data with incremental size.
82 * \return VLC_FALSE if peek no more data, VLC_TRUE otherwise.
83 *****************************************************************************/
84 static vlc_bool_t Peek( demux_t *p_demux, vlc_bool_t b_first )
87 demux_sys_t *p_sys = p_demux->p_sys;
91 p_sys->i_data_peeked = 0;
93 else if( p_sys->i_data_peeked == p_sys->i_frame_size_estimate )
95 p_sys->i_frame_size_estimate += 5120;
97 i_data = stream_Peek( p_demux->s, &p_sys->p_peek,
98 p_sys->i_frame_size_estimate );
99 if( i_data == p_sys->i_data_peeked )
101 msg_Warn( p_demux, "no more data" );
104 p_sys->i_data_peeked = i_data;
107 msg_Warn( p_demux, "cannot peek data" );
113 /*****************************************************************************
114 * GetLine: Internal function used to dup a line of string from the buffer
115 *****************************************************************************/
116 static char* GetLine( demux_t *p_demux, int *p_pos )
118 demux_sys_t *p_sys = p_demux->p_sys;
124 while( *p_pos > p_sys->i_data_peeked )
126 if( ! Peek( p_demux, VLC_FALSE ) )
131 p_buf = p_sys->p_peek + *p_pos;
132 i_size = p_sys->i_data_peeked - *p_pos;
134 while( p_buf[i] != '\n' )
139 if( ! Peek( p_demux, VLC_FALSE ) )
144 p_buf = p_sys->p_peek + *p_pos;
145 i_size = p_sys->i_data_peeked - *p_pos;
148 if( i > 0 && '\r' == p_buf[i - 1] )
152 p_line = malloc( i + 1 );
155 msg_Err( p_demux, "out of memory" );
158 strncpy ( p_line, p_buf, i );
160 // msg_Dbg( p_demux, "i = %d, pos = %d, %s", i, *p_pos, p_line );
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 VLC_TRUE if content type is image/jpeg, VLC_FALSE otherwise
169 *****************************************************************************/
170 static vlc_bool_t CheckMimeHeader( demux_t *p_demux, int *p_header_size )
172 vlc_bool_t b_jpeg = VLC_FALSE;
176 demux_sys_t *p_sys = p_demux->p_sys;
178 if( !Peek( p_demux, VLC_TRUE ) )
180 msg_Err( p_demux, "cannot peek" );
184 if( p_sys->i_data_peeked < 3)
186 msg_Err( p_demux, "data shortage" );
190 if( strncmp( p_sys->p_peek, "--", 2 ) )
196 psz_line = GetLine( p_demux, &i_pos );
197 if( NULL == psz_line )
199 msg_Err( p_demux, "no EOL" );
203 if( NULL == p_sys->psz_separator )
205 p_sys->psz_separator = psz_line;
206 msg_Dbg( p_demux, "Multipart MIME detected, using separator: %s",
207 p_sys->psz_separator );
211 if( strcmp( psz_line, p_sys->psz_separator ) )
213 msg_Warn( p_demux, "separator %s does not match %s", psz_line,
214 p_sys->psz_separator );
218 psz_line = GetLine( p_demux, &i_pos );
219 while( psz_line && *psz_line )
221 if( !strncasecmp( psz_line, "Content-Type:", 13 ) )
223 p_ch = psz_line + 13;
224 while( *p_ch != '\0' && ( *p_ch == ' ' || *p_ch == '\t' ) ) p_ch++;
225 if( strncasecmp( p_ch, "image/jpeg", 10 ) )
227 msg_Warn( p_demux, "%s, image/jpeg is expected", psz_line );
237 msg_Dbg( p_demux, "Discard MIME header: %s", psz_line );
240 psz_line = GetLine( p_demux, &i_pos );
243 if( NULL == psz_line )
245 msg_Err( p_demux, "no EOL" );
252 *p_header_size = i_pos;
256 static int SendBlock( demux_t *p_demux, int i )
258 demux_sys_t *p_sys = p_demux->p_sys;
261 if( ( p_block = stream_Block( p_demux->s, i ) ) == NULL )
263 msg_Warn( p_demux, "cannot read data" );
267 if( !p_sys->i_frame_length || !p_sys->i_time )
269 p_sys->i_time = p_block->i_dts = p_block->i_pts = mdate();
273 p_block->i_dts = p_block->i_pts = p_sys->i_time;
274 p_sys->i_time += p_sys->i_frame_length;
278 es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block->i_pts );
279 es_out_Send( p_demux->out, p_sys->p_es, p_block );
283 p_sys->i_still_end = mdate() + p_sys->i_still_length;
289 /*****************************************************************************
290 * Open: check file and initializes structures
291 *****************************************************************************/
292 static int Open( vlc_object_t * p_this )
294 demux_t *p_demux = (demux_t*)p_this;
297 int b_matched = VLC_FALSE;
301 p_demux->pf_control = Control;
302 p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
306 p_sys->psz_separator = NULL;
307 p_sys->i_frame_size_estimate = 15 * 1024;
309 b_matched = CheckMimeHeader( p_demux, &i_size);
312 p_demux->pf_demux = MimeDemux;
313 stream_Read( p_demux->s, NULL, i_size );
315 else if( 0 == i_size )
317 /* 0xffd8 identify a JPEG SOI */
318 if( p_sys->p_peek[0] == 0xFF && p_sys->p_peek[1] == 0xD8 )
320 msg_Dbg( p_demux, "JPEG SOI marker detected" );
321 p_demux->pf_demux = MjpgDemux;
334 var_Create( p_demux, "mjpeg-fps", VLC_VAR_FLOAT | VLC_VAR_DOINHERIT );
335 var_Get( p_demux, "mjpeg-fps", &val );
336 p_sys->i_frame_length = 0;
338 /* Check for jpeg file extension */
339 p_sys->b_still = VLC_FALSE;
340 p_sys->i_still_end = 0;
341 psz_ext = strrchr( p_demux->psz_path, '.' );
342 if( psz_ext && ( !strcasecmp( psz_ext, ".jpeg" ) ||
343 !strcasecmp( psz_ext, ".jpg" ) ) )
345 p_sys->b_still = VLC_TRUE;
348 p_sys->i_still_length =1000000.0 / val.f_float;
352 /* Defaults to 1fps */
353 p_sys->i_still_length = 1000000;
356 else if ( val.f_float )
358 p_sys->i_frame_length = 1000000.0 / val.f_float;
361 es_format_Init( &p_sys->fmt, VIDEO_ES, 0 );
362 p_sys->fmt.i_codec = VLC_FOURCC('m','j','p','g');
364 p_sys->p_es = es_out_Add( p_demux->out, &p_sys->fmt );
372 /*****************************************************************************
373 * Demux: read packet and send them to decoders
374 *****************************************************************************
375 * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
376 *****************************************************************************/
377 static int MjpgDemux( demux_t *p_demux )
379 demux_sys_t *p_sys = p_demux->p_sys;
382 if( p_sys->b_still && p_sys->i_still_end && p_sys->i_still_end < mdate() )
384 /* Still frame, wait until the pause delay is gone */
385 p_sys->i_still_end = 0;
387 else if( p_sys->b_still && p_sys->i_still_end )
393 if( !Peek( p_demux, VLC_TRUE ) )
395 msg_Warn( p_demux, "cannot peek data" );
398 if( p_sys->i_data_peeked < 4 )
400 msg_Warn( p_demux, "data shortage" );
404 while( !( 0xFF == p_sys->p_peek[i-1] && 0xD9 == p_sys->p_peek[i] ) )
407 if( i >= p_sys->i_data_peeked )
409 msg_Dbg( p_demux, "Did not find JPEG EOI in %d bytes",
410 p_sys->i_data_peeked );
411 if( !Peek( p_demux, VLC_FALSE ) )
413 msg_Warn( p_demux, "No more data is available at the moment" );
420 msg_Dbg( p_demux, "JPEG EOI detected at %d", i );
421 return SendBlock( p_demux, i );
424 static int MimeDemux( demux_t *p_demux )
426 demux_sys_t *p_sys = p_demux->p_sys;
431 b_match = CheckMimeHeader( p_demux, &i_size );
434 stream_Read( p_demux->s, NULL, i_size );
436 else if( i_size < 0 )
442 // No MIME header, assume OK
446 if( !Peek( p_demux, VLC_TRUE ) )
448 msg_Warn( p_demux, "cannot peek data" );
452 i_size = strlen( p_sys->psz_separator ) + 2;
453 if( p_sys->i_data_peeked < i_size )
455 msg_Warn( p_demux, "data shortage" );
461 while( !( p_sys->p_peek[i] == '-' && p_sys->p_peek[i+1] == '-' ) )
465 if( i_size >= p_sys->i_data_peeked )
467 msg_Dbg( p_demux, "MIME boundary not found in %d bytes of "
468 "data", p_sys->i_data_peeked );
470 if( !Peek( p_demux, VLC_FALSE ) )
472 msg_Warn( p_demux, "No more data is available at the "
478 if( !strncmp( p_sys->psz_separator, p_sys->p_peek + i + 2,
479 strlen( p_sys->psz_separator ) ) )
492 msg_Err( p_demux, "Discard non-JPEG part" );
493 stream_Read( p_demux->s, NULL, i );
497 return SendBlock( p_demux, i );
500 /*****************************************************************************
501 * Close: frees unused data
502 *****************************************************************************/
503 static void Close ( vlc_object_t * p_this )
505 demux_t *p_demux = (demux_t*)p_this;
506 demux_sys_t *p_sys = p_demux->p_sys;
508 if( p_sys->psz_separator )
510 free( p_sys->psz_separator );
515 /*****************************************************************************
517 *****************************************************************************/
518 static int Control( demux_t *p_demux, int i_query, va_list args )
520 return demux2_vaControlHelper( p_demux->s, 0, 0, 0, 0, i_query, args );