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 add_float( "mjpeg-fps", 0.0, NULL, FPS_TEXT, FPS_LONGTEXT, VLC_FALSE );
54 /*****************************************************************************
56 *****************************************************************************/
57 static int MimeDemux( demux_t * );
58 static int MjpgDemux( demux_t * );
59 static int Control( demux_t *, int i_query, va_list args );
68 mtime_t i_still_length;
71 mtime_t i_frame_length;
73 int i_frame_size_estimate;
78 /*****************************************************************************
79 * Peek: Helper function to peek data with incremental size.
80 * \return VLC_FALSE if peek no more data, VLC_TRUE otherwise.
81 *****************************************************************************/
82 static vlc_bool_t Peek( demux_t *p_demux, vlc_bool_t b_first )
85 demux_sys_t *p_sys = p_demux->p_sys;
89 p_sys->i_data_peeked = 0;
91 else if( p_sys->i_data_peeked == p_sys->i_frame_size_estimate )
93 p_sys->i_frame_size_estimate += 5120;
95 i_data = stream_Peek( p_demux->s, &p_sys->p_peek,
96 p_sys->i_frame_size_estimate );
97 if( i_data == p_sys->i_data_peeked )
99 msg_Warn( p_demux, "no more data" );
102 p_sys->i_data_peeked = i_data;
105 msg_Warn( p_demux, "cannot peek data" );
111 /*****************************************************************************
112 * GetLine: Internal function used to dup a line of string from the buffer
113 *****************************************************************************/
114 static char* GetLine( demux_t *p_demux, int *p_pos )
116 demux_sys_t *p_sys = p_demux->p_sys;
122 while( *p_pos > p_sys->i_data_peeked )
124 if( ! Peek( p_demux, VLC_FALSE ) )
129 p_buf = p_sys->p_peek + *p_pos;
130 i_size = p_sys->i_data_peeked - *p_pos;
132 while( p_buf[i] != '\n' )
137 if( ! Peek( p_demux, VLC_FALSE ) )
142 p_buf = p_sys->p_peek + *p_pos;
143 i_size = p_sys->i_data_peeked - *p_pos;
146 if( i > 0 && '\r' == p_buf[i - 1] )
150 p_line = malloc( i + 1 );
153 msg_Err( p_demux, "out of memory" );
156 strncpy ( p_line, p_buf, i );
158 // msg_Dbg( p_demux, "i = %d, pos = %d, %s", i, *p_pos, p_line );
162 /*****************************************************************************
163 * CheckMimeHeader: Internal function used to verify and skip mime header
164 * \param p_header_size Return size of MIME header, 0 if no MIME header
165 * detected, minus value if error
166 * \return VLC_TRUE if content type is image/jpeg, VLC_FALSE otherwise
167 *****************************************************************************/
168 static vlc_bool_t CheckMimeHeader( demux_t *p_demux, int *p_header_size )
170 vlc_bool_t b_jpeg = VLC_FALSE;
174 demux_sys_t *p_sys = p_demux->p_sys;
176 if( !Peek( p_demux, VLC_TRUE ) )
178 msg_Err( p_demux, "cannot peek" );
182 if( p_sys->i_data_peeked < 3)
184 msg_Err( p_demux, "data shortage" );
188 if( strncmp( p_sys->p_peek, "--", 2 ) )
194 psz_line = GetLine( p_demux, &i_pos );
195 if( NULL == psz_line )
197 msg_Err( p_demux, "no EOL" );
201 if( NULL == p_sys->psz_separator )
203 p_sys->psz_separator = psz_line;
204 msg_Dbg( p_demux, "Multipart MIME detected, using separator: %s",
205 p_sys->psz_separator );
209 if( strcmp( psz_line, p_sys->psz_separator ) )
211 msg_Warn( p_demux, "separator %s does not match %s", psz_line,
212 p_sys->psz_separator );
216 psz_line = GetLine( p_demux, &i_pos );
217 while( psz_line && *psz_line )
219 if( !strncasecmp( psz_line, "Content-Type:", 13 ) )
221 p_ch = psz_line + 13;
222 while( *p_ch != '\0' && ( *p_ch == ' ' || *p_ch == '\t' ) ) p_ch++;
223 if( strncasecmp( p_ch, "image/jpeg", 10 ) )
225 msg_Warn( p_demux, "%s, image/jpeg is expected", psz_line );
235 msg_Dbg( p_demux, "Discard MIME header: %s", psz_line );
238 psz_line = GetLine( p_demux, &i_pos );
241 if( NULL == psz_line )
243 msg_Err( p_demux, "no EOL" );
250 *p_header_size = i_pos;
254 static int SendBlock( demux_t *p_demux, int i )
256 demux_sys_t *p_sys = p_demux->p_sys;
259 if( ( p_block = stream_Block( p_demux->s, i ) ) == NULL )
261 msg_Warn( p_demux, "cannot read data" );
265 if( !p_sys->i_frame_length || !p_sys->i_time )
267 p_sys->i_time = p_block->i_dts = p_block->i_pts = mdate();
271 p_block->i_dts = p_block->i_pts = p_sys->i_time;
272 p_sys->i_time += p_sys->i_frame_length;
276 es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block->i_pts );
277 es_out_Send( p_demux->out, p_sys->p_es, p_block );
281 p_sys->i_still_end = mdate() + p_sys->i_still_length;
287 /*****************************************************************************
288 * Open: check file and initializes structures
289 *****************************************************************************/
290 static int Open( vlc_object_t * p_this )
292 demux_t *p_demux = (demux_t*)p_this;
295 int b_matched = VLC_FALSE;
299 p_demux->pf_control = Control;
300 p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
304 p_sys->psz_separator = NULL;
305 p_sys->i_frame_size_estimate = 15 * 1024;
307 b_matched = CheckMimeHeader( p_demux, &i_size);
310 p_demux->pf_demux = MimeDemux;
311 stream_Read( p_demux->s, NULL, i_size );
313 else if( 0 == i_size )
315 /* 0xffd8 identify a JPEG SOI */
316 if( p_sys->p_peek[0] == 0xFF && p_sys->p_peek[1] == 0xD8 )
318 msg_Dbg( p_demux, "JPEG SOI marker detected" );
319 p_demux->pf_demux = MjpgDemux;
332 var_Create( p_demux, "mjpeg-fps", VLC_VAR_FLOAT | VLC_VAR_DOINHERIT );
333 var_Get( p_demux, "mjpeg-fps", &val );
334 p_sys->i_frame_length = 0;
336 /* Check for jpeg file extension */
337 p_sys->b_still = VLC_FALSE;
338 p_sys->i_still_end = 0;
339 psz_ext = strrchr( p_demux->psz_path, '.' );
340 if( psz_ext && ( !strcasecmp( psz_ext, ".jpeg" ) ||
341 !strcasecmp( psz_ext, ".jpg" ) ) )
343 p_sys->b_still = VLC_TRUE;
346 p_sys->i_still_length =1000000.0 / val.f_float;
350 /* Defaults to 1fps */
351 p_sys->i_still_length = 1000000;
354 else if ( val.f_float )
356 p_sys->i_frame_length = 1000000.0 / val.f_float;
359 es_format_Init( &p_sys->fmt, VIDEO_ES, 0 );
360 p_sys->fmt.i_codec = VLC_FOURCC('m','j','p','g');
362 p_sys->p_es = es_out_Add( p_demux->out, &p_sys->fmt );
370 /*****************************************************************************
371 * Demux: read packet and send them to decoders
372 *****************************************************************************
373 * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
374 *****************************************************************************/
375 static int MjpgDemux( demux_t *p_demux )
377 demux_sys_t *p_sys = p_demux->p_sys;
380 if( p_sys->b_still && p_sys->i_still_end && p_sys->i_still_end < mdate() )
382 /* Still frame, wait until the pause delay is gone */
383 p_sys->i_still_end = 0;
385 else if( p_sys->b_still && p_sys->i_still_end )
391 if( !Peek( p_demux, VLC_TRUE ) )
393 msg_Warn( p_demux, "cannot peek data" );
396 if( p_sys->i_data_peeked < 4 )
398 msg_Warn( p_demux, "data shortage" );
402 while( !( 0xFF == p_sys->p_peek[i-1] && 0xD9 == p_sys->p_peek[i] ) )
405 if( i >= p_sys->i_data_peeked )
407 msg_Dbg( p_demux, "Did not find JPEG EOI in %d bytes",
408 p_sys->i_data_peeked );
409 if( !Peek( p_demux, VLC_FALSE ) )
411 msg_Warn( p_demux, "No more data is available at the moment" );
418 msg_Dbg( p_demux, "JPEG EOI detected at %d", i );
419 return SendBlock( p_demux, i );
422 static int MimeDemux( demux_t *p_demux )
424 demux_sys_t *p_sys = p_demux->p_sys;
429 b_match = CheckMimeHeader( p_demux, &i_size );
432 stream_Read( p_demux->s, NULL, i_size );
434 else if( i_size < 0 )
440 // No MIME header, assume OK
444 if( !Peek( p_demux, VLC_TRUE ) )
446 msg_Warn( p_demux, "cannot peek data" );
450 i_size = strlen( p_sys->psz_separator ) + 2;
451 if( p_sys->i_data_peeked < i_size )
453 msg_Warn( p_demux, "data shortage" );
459 while( !( p_sys->p_peek[i] == '-' && p_sys->p_peek[i+1] == '-' ) )
463 if( i_size >= p_sys->i_data_peeked )
465 msg_Dbg( p_demux, "MIME boundary not found in %d bytes of "
466 "data", p_sys->i_data_peeked );
468 if( !Peek( p_demux, VLC_FALSE ) )
470 msg_Warn( p_demux, "No more data is available at the "
476 if( !strncmp( p_sys->psz_separator, p_sys->p_peek + i + 2,
477 strlen( p_sys->psz_separator ) ) )
490 msg_Err( p_demux, "Discard non-JPEG part" );
491 stream_Read( p_demux->s, NULL, i );
495 return SendBlock( p_demux, i );
498 /*****************************************************************************
499 * Close: frees unused data
500 *****************************************************************************/
501 static void Close ( vlc_object_t * p_this )
503 demux_t *p_demux = (demux_t*)p_this;
504 demux_sys_t *p_sys = p_demux->p_sys;
506 if( p_sys->psz_separator )
508 free( p_sys->psz_separator );
513 /*****************************************************************************
515 *****************************************************************************/
516 static int Control( demux_t *p_demux, int i_query, va_list args )
518 return demux2_vaControlHelper( p_demux->s, 0, 0, 0, 0, i_query, args );