1 /*****************************************************************************
2 * mjpeg.c : demuxes mjpeg webcam http streams
3 *****************************************************************************
4 * Copyright (C) 2004 the VideoLAN team
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., 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>
39 #include <vlc_codecs.h>
41 /*****************************************************************************
43 *****************************************************************************/
44 static int Open ( vlc_object_t * );
45 static void Close( vlc_object_t * );
47 #define FPS_TEXT N_("Frames per Second")
48 #define FPS_LONGTEXT N_("This is the desired frame rate when " \
49 "playing MJPEG from a file. Use 0 (this is the default value) for a " \
50 "live stream (from a camera).")
53 set_shortname( "MJPEG");
54 set_description( N_("M-JPEG camera demuxer") );
55 set_capability( "demux", 5 );
56 set_callbacks( Open, Close );
57 set_category( CAT_INPUT );
58 set_subcategory( SUBCAT_INPUT_DEMUX );
59 add_float( "mjpeg-fps", 0.0, NULL, FPS_TEXT, FPS_LONGTEXT, false );
62 /*****************************************************************************
64 *****************************************************************************/
65 static int MimeDemux( demux_t * );
66 static int MjpgDemux( demux_t * );
67 static int Control( demux_t *, int i_query, va_list args );
76 mtime_t i_still_length;
79 mtime_t i_frame_length;
81 int i_frame_size_estimate;
82 const uint8_t *p_peek;
86 /*****************************************************************************
87 * Peek: Helper function to peek data with incremental size.
88 * \return false if peek no more data, true otherwise.
89 *****************************************************************************/
90 static bool Peek( demux_t *p_demux, bool b_first )
93 demux_sys_t *p_sys = p_demux->p_sys;
97 p_sys->i_data_peeked = 0;
99 else if( p_sys->i_data_peeked == p_sys->i_frame_size_estimate )
101 p_sys->i_frame_size_estimate += 5120;
103 i_data = stream_Peek( p_demux->s, &p_sys->p_peek,
104 p_sys->i_frame_size_estimate );
105 if( i_data == p_sys->i_data_peeked )
107 msg_Warn( p_demux, "no more data" );
110 p_sys->i_data_peeked = i_data;
113 msg_Warn( p_demux, "cannot peek data" );
119 /*****************************************************************************
120 * GetLine: Internal function used to dup a line of string from the buffer
121 *****************************************************************************/
122 static char* GetLine( demux_t *p_demux, int *p_pos )
124 demux_sys_t *p_sys = p_demux->p_sys;
125 const uint8_t *p_buf;
130 while( *p_pos > p_sys->i_data_peeked )
132 if( ! Peek( p_demux, false ) )
137 p_buf = p_sys->p_peek + *p_pos;
138 i_size = p_sys->i_data_peeked - *p_pos;
140 while( p_buf[i] != '\n' )
145 if( ! Peek( p_demux, false ) )
150 p_buf = p_sys->p_peek + *p_pos;
151 i_size = p_sys->i_data_peeked - *p_pos;
154 if( i > 0 && '\r' == p_buf[i - 1] )
158 p_line = malloc( i + 1 );
161 msg_Err( p_demux, "out of memory" );
164 strncpy ( p_line, (char*)p_buf, i );
166 // msg_Dbg( p_demux, "i = %d, pos = %d, %s", i, *p_pos, p_line );
170 /*****************************************************************************
171 * CheckMimeHeader: Internal function used to verify and skip mime header
172 * \param p_header_size Return size of MIME header, 0 if no MIME header
173 * detected, minus value if error
174 * \return true if content type is image/jpeg, false otherwise
175 *****************************************************************************/
176 static bool CheckMimeHeader( demux_t *p_demux, int *p_header_size )
182 demux_sys_t *p_sys = p_demux->p_sys;
184 if( !Peek( p_demux, true ) )
186 msg_Err( p_demux, "cannot peek" );
190 if( p_sys->i_data_peeked < 3)
192 msg_Err( p_demux, "data shortage" );
196 if( strncmp( (char *)p_sys->p_peek, "--", 2 ) )
202 psz_line = GetLine( p_demux, &i_pos );
203 if( NULL == psz_line )
205 msg_Err( p_demux, "no EOL" );
210 /* Read the separator and remember it if not yet stored */
211 if( p_sys->psz_separator == NULL )
213 p_sys->psz_separator = psz_line;
214 msg_Dbg( p_demux, "Multipart MIME detected, using separator: %s",
215 p_sys->psz_separator );
219 if( strcmp( psz_line, p_sys->psz_separator ) )
221 msg_Warn( p_demux, "separator %s does not match %s", psz_line,
222 p_sys->psz_separator );
227 psz_line = GetLine( p_demux, &i_pos );
228 while( psz_line && *psz_line )
230 if( !strncasecmp( psz_line, "Content-Type:", 13 ) )
232 p_ch = psz_line + 13;
233 while( *p_ch != '\0' && ( *p_ch == ' ' || *p_ch == '\t' ) ) p_ch++;
234 if( strncasecmp( p_ch, "image/jpeg", 10 ) )
236 msg_Warn( p_demux, "%s, image/jpeg is expected", psz_line );
246 msg_Dbg( p_demux, "discard MIME header: %s", psz_line );
249 psz_line = GetLine( p_demux, &i_pos );
252 if( NULL == psz_line )
254 msg_Err( p_demux, "no EOL" );
261 *p_header_size = i_pos;
265 static int SendBlock( demux_t *p_demux, int i )
267 demux_sys_t *p_sys = p_demux->p_sys;
270 if( ( p_block = stream_Block( p_demux->s, i ) ) == NULL )
272 msg_Warn( p_demux, "cannot read data" );
276 if( !p_sys->i_frame_length || !p_sys->i_time )
278 p_sys->i_time = p_block->i_dts = p_block->i_pts = mdate();
282 p_block->i_dts = p_block->i_pts = p_sys->i_time;
283 p_sys->i_time += p_sys->i_frame_length;
287 es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block->i_pts );
288 es_out_Send( p_demux->out, p_sys->p_es, p_block );
292 p_sys->i_still_end = mdate() + p_sys->i_still_length;
298 /*****************************************************************************
299 * Open: check file and initializes structures
300 *****************************************************************************/
301 static int Open( vlc_object_t * p_this )
303 demux_t *p_demux = (demux_t*)p_this;
306 int b_matched = false;
309 p_demux->pf_control = Control;
310 p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
314 p_sys->psz_separator = NULL;
315 p_sys->i_frame_size_estimate = 15 * 1024;
317 b_matched = CheckMimeHeader( p_demux, &i_size);
320 p_demux->pf_demux = MimeDemux;
321 stream_Read( p_demux->s, NULL, i_size );
323 else if( 0 == i_size )
325 /* 0xffd8 identify a JPEG SOI */
326 if( p_sys->p_peek[0] == 0xFF && p_sys->p_peek[1] == 0xD8 )
328 msg_Dbg( p_demux, "JPEG SOI marker detected" );
329 p_demux->pf_demux = MjpgDemux;
342 var_Create( p_demux, "mjpeg-fps", VLC_VAR_FLOAT | VLC_VAR_DOINHERIT );
343 var_Get( p_demux, "mjpeg-fps", &val );
344 p_sys->i_frame_length = 0;
346 /* Check for jpeg file extension */
347 p_sys->b_still = false;
348 p_sys->i_still_end = 0;
349 if( demux_IsPathExtension( p_demux, ".jpeg" ) ||
350 demux_IsPathExtension( p_demux, ".jpg" ) )
352 p_sys->b_still = true;
355 p_sys->i_still_length = 1000000.0 / val.f_float;
359 /* Defaults to 1fps */
360 p_sys->i_still_length = 1000000;
363 else if ( val.f_float )
365 p_sys->i_frame_length = 1000000.0 / val.f_float;
368 es_format_Init( &p_sys->fmt, VIDEO_ES, 0 );
369 p_sys->fmt.i_codec = VLC_FOURCC('m','j','p','g');
371 p_sys->p_es = es_out_Add( p_demux->out, &p_sys->fmt );
379 /*****************************************************************************
380 * Demux: read packet and send them to decoders
381 *****************************************************************************
382 * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
383 *****************************************************************************/
384 static int MjpgDemux( demux_t *p_demux )
386 demux_sys_t *p_sys = p_demux->p_sys;
389 if( p_sys->b_still && p_sys->i_still_end && p_sys->i_still_end < mdate() )
391 /* Still frame, wait until the pause delay is gone */
392 p_sys->i_still_end = 0;
394 else if( p_sys->b_still && p_sys->i_still_end )
400 if( !Peek( p_demux, true ) )
402 msg_Warn( p_demux, "cannot peek data" );
405 if( p_sys->i_data_peeked < 4 )
407 msg_Warn( p_demux, "data shortage" );
411 while( !( 0xFF == p_sys->p_peek[i-1] && 0xD9 == p_sys->p_peek[i] ) )
414 if( i >= p_sys->i_data_peeked )
416 msg_Dbg( p_demux, "did not find JPEG EOI in %d bytes",
417 p_sys->i_data_peeked );
418 if( !Peek( p_demux, false ) )
420 msg_Warn( p_demux, "no more data is available at the moment" );
427 msg_Dbg( p_demux, "JPEG EOI detected at %d", i );
428 return SendBlock( p_demux, i );
431 static int MimeDemux( demux_t *p_demux )
433 demux_sys_t *p_sys = p_demux->p_sys;
436 bool b_match = CheckMimeHeader( p_demux, &i_size );
440 stream_Read( p_demux->s, NULL, i_size );
442 else if( i_size < 0 )
448 // No MIME header, assume OK
452 if( !Peek( p_demux, true ) )
454 msg_Warn( p_demux, "cannot peek data" );
459 i_size = strlen( p_sys->psz_separator ) + 2;
460 if( p_sys->i_data_peeked < i_size )
462 msg_Warn( p_demux, "data shortage" );
468 while( !( p_sys->p_peek[i] == '-' && p_sys->p_peek[i+1] == '-' ) )
472 if( i_size >= p_sys->i_data_peeked )
474 msg_Dbg( p_demux, "MIME boundary not found in %d bytes of "
475 "data", p_sys->i_data_peeked );
477 if( !Peek( p_demux, false ) )
479 msg_Warn( p_demux, "no more data is available at the "
486 if( !strncmp( p_sys->psz_separator, (char *)(p_sys->p_peek + i + 2),
487 strlen( p_sys->psz_separator ) ) )
498 msg_Err( p_demux, "discard non-JPEG part" );
499 stream_Read( p_demux->s, NULL, i );
503 return SendBlock( p_demux, i );
506 /*****************************************************************************
507 * Close: frees unused data
508 *****************************************************************************/
509 static void Close ( vlc_object_t * p_this )
511 demux_t *p_demux = (demux_t*)p_this;
512 demux_sys_t *p_sys = p_demux->p_sys;
514 free( p_sys->psz_separator );
518 /*****************************************************************************
520 *****************************************************************************/
521 static int Control( demux_t *p_demux, int i_query, va_list args )
523 return demux_vaControlHelper( p_demux->s, 0, 0, 0, 0, i_query, args );