1 /*****************************************************************************
2 * mjpeg.c : demuxes mjpeg webcam http streams
3 *****************************************************************************
4 * Copyright (C) 2004 VideoLAN (Centrale Réseaux) and its contributors
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_shortname( "MJPEG");
49 set_description( _("JPEG camera demuxer") );
50 set_capability( "demux2", 5 );
51 set_callbacks( Open, Close );
52 set_category( CAT_INPUT );
53 set_subcategory( SUBCAT_INPUT_DEMUX );
54 add_float( "mjpeg-fps", 0.0, NULL, FPS_TEXT, FPS_LONGTEXT, VLC_FALSE );
57 /*****************************************************************************
59 *****************************************************************************/
60 static int MimeDemux( demux_t * );
61 static int MjpgDemux( demux_t * );
62 static int Control( demux_t *, int i_query, va_list args );
71 mtime_t i_still_length;
74 mtime_t i_frame_length;
76 int i_frame_size_estimate;
81 /*****************************************************************************
82 * Peek: Helper function to peek data with incremental size.
83 * \return VLC_FALSE if peek no more data, VLC_TRUE otherwise.
84 *****************************************************************************/
85 static vlc_bool_t Peek( demux_t *p_demux, vlc_bool_t b_first )
88 demux_sys_t *p_sys = p_demux->p_sys;
92 p_sys->i_data_peeked = 0;
94 else if( p_sys->i_data_peeked == p_sys->i_frame_size_estimate )
96 p_sys->i_frame_size_estimate += 5120;
98 i_data = stream_Peek( p_demux->s, &p_sys->p_peek,
99 p_sys->i_frame_size_estimate );
100 if( i_data == p_sys->i_data_peeked )
102 msg_Warn( p_demux, "no more data" );
105 p_sys->i_data_peeked = i_data;
108 msg_Warn( p_demux, "cannot peek data" );
114 /*****************************************************************************
115 * GetLine: Internal function used to dup a line of string from the buffer
116 *****************************************************************************/
117 static char* GetLine( demux_t *p_demux, int *p_pos )
119 demux_sys_t *p_sys = p_demux->p_sys;
125 while( *p_pos > p_sys->i_data_peeked )
127 if( ! Peek( p_demux, VLC_FALSE ) )
132 p_buf = p_sys->p_peek + *p_pos;
133 i_size = p_sys->i_data_peeked - *p_pos;
135 while( p_buf[i] != '\n' )
140 if( ! Peek( p_demux, VLC_FALSE ) )
145 p_buf = p_sys->p_peek + *p_pos;
146 i_size = p_sys->i_data_peeked - *p_pos;
149 if( i > 0 && '\r' == p_buf[i - 1] )
153 p_line = malloc( i + 1 );
156 msg_Err( p_demux, "out of memory" );
159 strncpy ( p_line, p_buf, i );
161 // msg_Dbg( p_demux, "i = %d, pos = %d, %s", i, *p_pos, p_line );
165 /*****************************************************************************
166 * CheckMimeHeader: Internal function used to verify and skip mime header
167 * \param p_header_size Return size of MIME header, 0 if no MIME header
168 * detected, minus value if error
169 * \return VLC_TRUE if content type is image/jpeg, VLC_FALSE otherwise
170 *****************************************************************************/
171 static vlc_bool_t CheckMimeHeader( demux_t *p_demux, int *p_header_size )
173 vlc_bool_t b_jpeg = VLC_FALSE;
177 demux_sys_t *p_sys = p_demux->p_sys;
179 if( !Peek( p_demux, VLC_TRUE ) )
181 msg_Err( p_demux, "cannot peek" );
185 if( p_sys->i_data_peeked < 3)
187 msg_Err( p_demux, "data shortage" );
191 if( strncmp( p_sys->p_peek, "--", 2 ) )
197 psz_line = GetLine( p_demux, &i_pos );
198 if( NULL == psz_line )
200 msg_Err( p_demux, "no EOL" );
204 if( NULL == p_sys->psz_separator )
206 p_sys->psz_separator = psz_line;
207 msg_Dbg( p_demux, "Multipart MIME detected, using separator: %s",
208 p_sys->psz_separator );
212 if( strcmp( psz_line, p_sys->psz_separator ) )
214 msg_Warn( p_demux, "separator %s does not match %s", psz_line,
215 p_sys->psz_separator );
219 psz_line = GetLine( p_demux, &i_pos );
220 while( psz_line && *psz_line )
222 if( !strncasecmp( psz_line, "Content-Type:", 13 ) )
224 p_ch = psz_line + 13;
225 while( *p_ch != '\0' && ( *p_ch == ' ' || *p_ch == '\t' ) ) p_ch++;
226 if( strncasecmp( p_ch, "image/jpeg", 10 ) )
228 msg_Warn( p_demux, "%s, image/jpeg is expected", psz_line );
238 msg_Dbg( p_demux, "Discard MIME header: %s", psz_line );
241 psz_line = GetLine( p_demux, &i_pos );
244 if( NULL == psz_line )
246 msg_Err( p_demux, "no EOL" );
253 *p_header_size = i_pos;
257 static int SendBlock( demux_t *p_demux, int i )
259 demux_sys_t *p_sys = p_demux->p_sys;
262 if( ( p_block = stream_Block( p_demux->s, i ) ) == NULL )
264 msg_Warn( p_demux, "cannot read data" );
268 if( !p_sys->i_frame_length || !p_sys->i_time )
270 p_sys->i_time = p_block->i_dts = p_block->i_pts = mdate();
274 p_block->i_dts = p_block->i_pts = p_sys->i_time;
275 p_sys->i_time += p_sys->i_frame_length;
279 es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block->i_pts );
280 es_out_Send( p_demux->out, p_sys->p_es, p_block );
284 p_sys->i_still_end = mdate() + p_sys->i_still_length;
290 /*****************************************************************************
291 * Open: check file and initializes structures
292 *****************************************************************************/
293 static int Open( vlc_object_t * p_this )
295 demux_t *p_demux = (demux_t*)p_this;
298 int b_matched = VLC_FALSE;
302 p_demux->pf_control = Control;
303 p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
307 p_sys->psz_separator = NULL;
308 p_sys->i_frame_size_estimate = 15 * 1024;
310 b_matched = CheckMimeHeader( p_demux, &i_size);
313 p_demux->pf_demux = MimeDemux;
314 stream_Read( p_demux->s, NULL, i_size );
316 else if( 0 == i_size )
318 /* 0xffd8 identify a JPEG SOI */
319 if( p_sys->p_peek[0] == 0xFF && p_sys->p_peek[1] == 0xD8 )
321 msg_Dbg( p_demux, "JPEG SOI marker detected" );
322 p_demux->pf_demux = MjpgDemux;
335 var_Create( p_demux, "mjpeg-fps", VLC_VAR_FLOAT | VLC_VAR_DOINHERIT );
336 var_Get( p_demux, "mjpeg-fps", &val );
337 p_sys->i_frame_length = 0;
339 /* Check for jpeg file extension */
340 p_sys->b_still = VLC_FALSE;
341 p_sys->i_still_end = 0;
342 psz_ext = strrchr( p_demux->psz_path, '.' );
343 if( psz_ext && ( !strcasecmp( psz_ext, ".jpeg" ) ||
344 !strcasecmp( psz_ext, ".jpg" ) ) )
346 p_sys->b_still = VLC_TRUE;
349 p_sys->i_still_length =1000000.0 / val.f_float;
353 /* Defaults to 1fps */
354 p_sys->i_still_length = 1000000;
357 else if ( val.f_float )
359 p_sys->i_frame_length = 1000000.0 / val.f_float;
362 es_format_Init( &p_sys->fmt, VIDEO_ES, 0 );
363 p_sys->fmt.i_codec = VLC_FOURCC('m','j','p','g');
365 p_sys->p_es = es_out_Add( p_demux->out, &p_sys->fmt );
373 /*****************************************************************************
374 * Demux: read packet and send them to decoders
375 *****************************************************************************
376 * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
377 *****************************************************************************/
378 static int MjpgDemux( demux_t *p_demux )
380 demux_sys_t *p_sys = p_demux->p_sys;
383 if( p_sys->b_still && p_sys->i_still_end && p_sys->i_still_end < mdate() )
385 /* Still frame, wait until the pause delay is gone */
386 p_sys->i_still_end = 0;
388 else if( p_sys->b_still && p_sys->i_still_end )
394 if( !Peek( p_demux, VLC_TRUE ) )
396 msg_Warn( p_demux, "cannot peek data" );
399 if( p_sys->i_data_peeked < 4 )
401 msg_Warn( p_demux, "data shortage" );
405 while( !( 0xFF == p_sys->p_peek[i-1] && 0xD9 == p_sys->p_peek[i] ) )
408 if( i >= p_sys->i_data_peeked )
410 msg_Dbg( p_demux, "Did not find JPEG EOI in %d bytes",
411 p_sys->i_data_peeked );
412 if( !Peek( p_demux, VLC_FALSE ) )
414 msg_Warn( p_demux, "No more data is available at the moment" );
421 msg_Dbg( p_demux, "JPEG EOI detected at %d", i );
422 return SendBlock( p_demux, i );
425 static int MimeDemux( demux_t *p_demux )
427 demux_sys_t *p_sys = p_demux->p_sys;
432 b_match = CheckMimeHeader( p_demux, &i_size );
435 stream_Read( p_demux->s, NULL, i_size );
437 else if( i_size < 0 )
443 // No MIME header, assume OK
447 if( !Peek( p_demux, VLC_TRUE ) )
449 msg_Warn( p_demux, "cannot peek data" );
453 i_size = strlen( p_sys->psz_separator ) + 2;
454 if( p_sys->i_data_peeked < i_size )
456 msg_Warn( p_demux, "data shortage" );
462 while( !( p_sys->p_peek[i] == '-' && p_sys->p_peek[i+1] == '-' ) )
466 if( i_size >= p_sys->i_data_peeked )
468 msg_Dbg( p_demux, "MIME boundary not found in %d bytes of "
469 "data", p_sys->i_data_peeked );
471 if( !Peek( p_demux, VLC_FALSE ) )
473 msg_Warn( p_demux, "No more data is available at the "
479 if( !strncmp( p_sys->psz_separator, p_sys->p_peek + i + 2,
480 strlen( p_sys->psz_separator ) ) )
493 msg_Err( p_demux, "Discard non-JPEG part" );
494 stream_Read( p_demux->s, NULL, i );
498 return SendBlock( p_demux, i );
501 /*****************************************************************************
502 * Close: frees unused data
503 *****************************************************************************/
504 static void Close ( vlc_object_t * p_this )
506 demux_t *p_demux = (demux_t*)p_this;
507 demux_sys_t *p_sys = p_demux->p_sys;
509 if( p_sys->psz_separator )
511 free( p_sys->psz_separator );
516 /*****************************************************************************
518 *****************************************************************************/
519 static int Control( demux_t *p_demux, int i_query, va_list args )
521 return demux2_vaControlHelper( p_demux->s, 0, 0, 0, 0, i_query, args );