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 );
70 mtime_t i_frame_length;
72 int i_frame_size_estimate;
77 /*****************************************************************************
78 * Peek: Helper function to peek data with incremental size.
79 * \return VLC_FALSE if peek no more data, VLC_TRUE otherwise.
80 *****************************************************************************/
81 static vlc_bool_t Peek( demux_t *p_demux, vlc_bool_t b_first )
84 demux_sys_t *p_sys = p_demux->p_sys;
88 p_sys->i_data_peeked = 0;
90 else if( p_sys->i_data_peeked == p_sys->i_frame_size_estimate )
92 p_sys->i_frame_size_estimate += 5120;
94 i_data = stream_Peek( p_demux->s, &p_sys->p_peek,
95 p_sys->i_frame_size_estimate );
96 if( i_data == p_sys->i_data_peeked )
98 msg_Warn( p_demux, "no more data" );
101 p_sys->i_data_peeked = i_data;
104 msg_Warn( p_demux, "cannot peek data" );
110 /*****************************************************************************
111 * GetLine: Internal function used to dup a line of string from the buffer
112 *****************************************************************************/
113 static char* GetLine( demux_t *p_demux, int *p_pos )
115 demux_sys_t *p_sys = p_demux->p_sys;
121 while( *p_pos > p_sys->i_data_peeked )
123 if( ! Peek( p_demux, VLC_FALSE ) )
128 p_buf = p_sys->p_peek + *p_pos;
129 i_size = p_sys->i_data_peeked - *p_pos;
131 while( p_buf[i] != '\n' )
136 if( ! Peek( p_demux, VLC_FALSE ) )
141 p_buf = p_sys->p_peek + *p_pos;
142 i_size = p_sys->i_data_peeked - *p_pos;
145 if( i > 0 && '\r' == p_buf[i - 1] )
149 p_line = malloc( i + 1 );
152 msg_Err( p_demux, "out of memory" );
155 strncpy ( p_line, p_buf, i );
157 // msg_Dbg( p_demux, "i = %d, pos = %d, %s", i, *p_pos, p_line );
161 /*****************************************************************************
162 * CheckMimeHeader: Internal function used to verify and skip mime header
163 * \param p_header_size Return size of MIME header, 0 if no MIME header
164 * detected, minus value if error
165 * \return VLC_TRUE if content type is image/jpeg, VLC_FALSE otherwise
166 *****************************************************************************/
167 static vlc_bool_t CheckMimeHeader( demux_t *p_demux, int *p_header_size )
169 vlc_bool_t b_jpeg = VLC_FALSE;
173 demux_sys_t *p_sys = p_demux->p_sys;
175 if( !Peek( p_demux, VLC_TRUE ) )
177 msg_Err( p_demux, "cannot peek" );
181 if( p_sys->i_data_peeked < 3)
183 msg_Err( p_demux, "data shortage" );
187 if( strncmp( p_sys->p_peek, "--", 2 ) )
193 psz_line = GetLine( p_demux, &i_pos );
194 if( NULL == psz_line )
196 msg_Err( p_demux, "no EOL" );
200 if( NULL == p_sys->psz_separator )
202 p_sys->psz_separator = psz_line;
203 msg_Dbg( p_demux, "Multipart MIME detected, using separator: %s",
204 p_sys->psz_separator );
208 if( strcmp( psz_line, p_sys->psz_separator ) )
210 msg_Warn( p_demux, "separator %s does not match %s", psz_line,
211 p_sys->psz_separator );
215 psz_line = GetLine( p_demux, &i_pos );
216 while( psz_line && *psz_line )
218 if( !strncasecmp( psz_line, "Content-Type:", 13 ) )
220 p_ch = psz_line + 13;
221 while( *p_ch != '\0' && ( *p_ch == ' ' || *p_ch == '\t' ) ) p_ch++;
222 if( strncasecmp( p_ch, "image/jpeg", 10 ) )
224 msg_Warn( p_demux, "%s, image/jpeg is expected", psz_line );
234 msg_Dbg( p_demux, "Discard MIME header: %s", psz_line );
237 psz_line = GetLine( p_demux, &i_pos );
240 if( NULL == psz_line )
242 msg_Err( p_demux, "no EOL" );
249 *p_header_size = i_pos;
253 static int SendBlock( demux_t *p_demux, int i )
255 demux_sys_t *p_sys = p_demux->p_sys;
258 if( ( p_block = stream_Block( p_demux->s, i ) ) == NULL )
260 msg_Warn( p_demux, "cannot read data" );
264 if( !p_sys->i_frame_length || !p_sys->i_time )
266 p_sys->i_time = p_block->i_dts = p_block->i_pts = mdate();
270 p_block->i_dts = p_block->i_pts = p_sys->i_time;
271 p_sys->i_time += p_sys->i_frame_length;
275 es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block->i_pts );
276 es_out_Send( p_demux->out, p_sys->p_es, p_block );
280 p_sys->i_still_end = mdate() + I64C(5000000);
286 /*****************************************************************************
287 * Open: check file and initializes structures
288 *****************************************************************************/
289 static int Open( vlc_object_t * p_this )
291 demux_t *p_demux = (demux_t*)p_this;
294 int b_matched = VLC_FALSE;
298 p_demux->pf_control = Control;
299 p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
303 p_sys->psz_separator = NULL;
304 p_sys->i_frame_size_estimate = 15 * 1024;
306 b_matched = CheckMimeHeader( p_demux, &i_size);
309 p_demux->pf_demux = MimeDemux;
310 stream_Read( p_demux->s, NULL, i_size );
312 else if( 0 == i_size )
314 /* 0xffd8 identify a JPEG SOI */
315 if( p_sys->p_peek[0] == 0xFF && p_sys->p_peek[1] == 0xD8 )
317 msg_Dbg( p_demux, "JPEG SOI marker detected" );
318 p_demux->pf_demux = MjpgDemux;
330 /* Check for jpeg file extension */
331 p_sys->b_still = VLC_FALSE;
332 p_sys->i_still_end = 0;
333 psz_ext = strrchr( p_demux->psz_path, '.' );
334 if( psz_ext && ( !strcasecmp( psz_ext, ".jpeg" ) ||
335 !strcasecmp( psz_ext, ".jpg" ) ) )
337 p_sys->b_still = VLC_TRUE;
340 var_Create( p_demux, "mjpeg-fps", VLC_VAR_FLOAT | VLC_VAR_DOINHERIT );
341 var_Get( p_demux, "mjpeg-fps", &val );
342 p_sys->i_frame_length = 0;
345 p_sys->i_frame_length = 1000000.0 / val.f_float;
348 es_format_Init( &p_sys->fmt, VIDEO_ES, 0 );
349 p_sys->fmt.i_codec = VLC_FOURCC('m','j','p','g');
351 p_sys->p_es = es_out_Add( p_demux->out, &p_sys->fmt );
359 /*****************************************************************************
360 * Demux: read packet and send them to decoders
361 *****************************************************************************
362 * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
363 *****************************************************************************/
364 static int MjpgDemux( demux_t *p_demux )
366 demux_sys_t *p_sys = p_demux->p_sys;
369 if( p_sys->b_still && p_sys->i_still_end && p_sys->i_still_end < mdate() )
371 /* Still frame, wait until the pause delay is gone */
372 p_sys->i_still_end = 0;
374 else if( p_sys->b_still && p_sys->i_still_end )
380 if( !Peek( p_demux, VLC_TRUE ) )
382 msg_Warn( p_demux, "cannot peek data" );
385 if( p_sys->i_data_peeked < 4 )
387 msg_Warn( p_demux, "data shortage" );
391 while( !( 0xFF == p_sys->p_peek[i-1] && 0xD9 == p_sys->p_peek[i] ) )
394 if( i >= p_sys->i_data_peeked )
396 msg_Dbg( p_demux, "Did not find JPEG EOI in %d bytes",
397 p_sys->i_data_peeked );
398 if( !Peek( p_demux, VLC_FALSE ) )
400 msg_Warn( p_demux, "No more data is available at the moment" );
407 msg_Dbg( p_demux, "JPEG EOI detected at %d", i );
408 return SendBlock( p_demux, i );
411 static int MimeDemux( demux_t *p_demux )
413 demux_sys_t *p_sys = p_demux->p_sys;
418 b_match = CheckMimeHeader( p_demux, &i_size );
421 stream_Read( p_demux->s, NULL, i_size );
423 else if( i_size < 0 )
429 // No MIME header, assume OK
433 if( !Peek( p_demux, VLC_TRUE ) )
435 msg_Warn( p_demux, "cannot peek data" );
439 i_size = strlen( p_sys->psz_separator ) + 2;
440 if( p_sys->i_data_peeked < i_size )
442 msg_Warn( p_demux, "data shortage" );
448 while( !( p_sys->p_peek[i] == '-' && p_sys->p_peek[i+1] == '-' ) )
452 if( i_size >= p_sys->i_data_peeked )
454 msg_Dbg( p_demux, "MIME boundary not found in %d bytes of "
455 "data", p_sys->i_data_peeked );
457 if( !Peek( p_demux, VLC_FALSE ) )
459 msg_Warn( p_demux, "No more data is available at the "
465 if( !strncmp( p_sys->psz_separator, p_sys->p_peek + i + 2,
466 strlen( p_sys->psz_separator ) ) )
479 msg_Err( p_demux, "Discard non-JPEG part" );
480 stream_Read( p_demux->s, NULL, i );
484 return SendBlock( p_demux, i );
487 /*****************************************************************************
488 * Close: frees unused data
489 *****************************************************************************/
490 static void Close ( vlc_object_t * p_this )
492 demux_t *p_demux = (demux_t*)p_this;
493 demux_sys_t *p_sys = p_demux->p_sys;
495 if( p_sys->psz_separator )
497 free( p_sys->psz_separator );
502 /*****************************************************************************
504 *****************************************************************************/
505 static int Control( demux_t *p_demux, int i_query, va_list args )
507 return demux2_vaControlHelper( p_demux->s, 0, 0, 0, 0, i_query, args );