mirror of
https://code.videolan.org/videolan/vlc
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530 lines
15 KiB
C
530 lines
15 KiB
C
/*****************************************************************************
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* mjpeg.c : demuxes mjpeg webcam http streams
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*****************************************************************************
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* Copyright (C) 2004 the VideoLAN team
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* $Id$
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*
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* Authors: Henry Jen (slowhog) <henryjen@ztune.net>
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* Derk-Jan Hartman (thedj)
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* Sigmund Augdal (Dnumgis)
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* Laurent Aimar <fenrir@via.ecp.fr>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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/*****************************************************************************
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* Preamble
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*****************************************************************************/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <vlc_common.h>
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#include <vlc_plugin.h>
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#include <vlc_demux.h>
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/*****************************************************************************
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* Module descriptor
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*****************************************************************************/
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static int Open ( vlc_object_t * );
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static void Close( vlc_object_t * );
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#define FPS_TEXT N_("Frames per Second")
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#define FPS_LONGTEXT N_("This is the desired frame rate when " \
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"playing MJPEG from a file. Use 0 (this is the default value) for a " \
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"live stream (from a camera).")
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vlc_module_begin ()
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set_shortname( "MJPEG")
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set_description( N_("M-JPEG camera demuxer") )
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set_capability( "demux", 5 )
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set_callbacks( Open, Close )
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set_category( CAT_INPUT )
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set_subcategory( SUBCAT_INPUT_DEMUX )
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add_float( "mjpeg-fps", 0.0, NULL, FPS_TEXT, FPS_LONGTEXT, false )
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vlc_module_end ()
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/*****************************************************************************
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* Local prototypes
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*****************************************************************************/
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static int MimeDemux( demux_t * );
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static int MjpgDemux( demux_t * );
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static int Control( demux_t *, int i_query, va_list args );
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struct demux_sys_t
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{
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es_format_t fmt;
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es_out_id_t *p_es;
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bool b_still;
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mtime_t i_still_end;
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mtime_t i_still_length;
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mtime_t i_time;
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mtime_t i_frame_length;
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char *psz_separator;
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int i_frame_size_estimate;
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const uint8_t *p_peek;
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int i_data_peeked;
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int i_level;
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};
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/*****************************************************************************
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* Peek: Helper function to peek data with incremental size.
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* \return false if peek no more data, true otherwise.
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*****************************************************************************/
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static bool Peek( demux_t *p_demux, bool b_first )
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{
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int i_data;
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demux_sys_t *p_sys = p_demux->p_sys;
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if( b_first )
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{
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p_sys->i_data_peeked = 0;
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}
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else if( p_sys->i_data_peeked == p_sys->i_frame_size_estimate )
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{
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p_sys->i_frame_size_estimate += 5120;
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}
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i_data = stream_Peek( p_demux->s, &p_sys->p_peek,
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p_sys->i_frame_size_estimate );
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if( i_data == p_sys->i_data_peeked )
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{
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msg_Warn( p_demux, "no more data" );
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return false;
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}
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p_sys->i_data_peeked = i_data;
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if( i_data <= 0 )
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{
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msg_Warn( p_demux, "cannot peek data" );
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return false;
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}
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return true;
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}
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/*****************************************************************************
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* GetLine: Internal function used to dup a line of string from the buffer
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*****************************************************************************/
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static char* GetLine( demux_t *p_demux, int *p_pos )
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{
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demux_sys_t *p_sys = p_demux->p_sys;
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const uint8_t *p_buf;
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int i_size;
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int i;
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char *p_line;
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while( *p_pos >= p_sys->i_data_peeked )
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{
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if( ! Peek( p_demux, false ) )
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{
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return NULL;
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}
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}
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p_buf = p_sys->p_peek + *p_pos;
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i_size = p_sys->i_data_peeked - *p_pos;
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i = 0;
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while( p_buf[i] != '\n' )
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{
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i++;
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if( i == i_size )
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{
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if( ! Peek( p_demux, false ) )
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{
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return NULL;
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}
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p_buf = p_sys->p_peek + *p_pos;
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i_size = p_sys->i_data_peeked - *p_pos;
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}
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}
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*p_pos += ( i + 1 );
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if( i > 0 && '\r' == p_buf[i - 1] )
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{
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i--;
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}
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p_line = malloc( i + 1 );
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if( p_line == NULL )
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return NULL;
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strncpy ( p_line, (char*)p_buf, i );
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p_line[i] = '\0';
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// msg_Dbg( p_demux, "i = %d, pos = %d, %s", i, *p_pos, p_line );
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return p_line;
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}
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/*****************************************************************************
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* CheckMimeHeader: Internal function used to verify and skip mime header
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* \param p_header_size Return size of MIME header, 0 if no MIME header
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* detected, minus value if error
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* \return true if content type is image/jpeg, false otherwise
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*****************************************************************************/
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static bool CheckMimeHeader( demux_t *p_demux, int *p_header_size )
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{
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bool b_jpeg = false;
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int i_pos;
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char *psz_line;
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char *p_ch;
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demux_sys_t *p_sys = p_demux->p_sys;
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if( !Peek( p_demux, true ) )
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{
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msg_Err( p_demux, "cannot peek" );
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*p_header_size = -1;
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return false;
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}
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if( p_sys->i_data_peeked < 5)
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{
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msg_Err( p_demux, "data shortage" );
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*p_header_size = -2;
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return false;
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}
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if( strncmp( (char *)p_sys->p_peek, "--", 2 ) != 0
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&& strncmp( (char *)p_sys->p_peek, "\r\n--", 4 ) != 0 )
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{
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*p_header_size = 0;
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return false;
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}
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i_pos = *p_sys->p_peek == '-' ? 2 : 4;
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psz_line = GetLine( p_demux, &i_pos );
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if( NULL == psz_line )
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{
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msg_Err( p_demux, "no EOL" );
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*p_header_size = -3;
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return false;
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}
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/* Read the separator and remember it if not yet stored */
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if( p_sys->psz_separator == NULL )
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{
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p_sys->psz_separator = psz_line;
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msg_Dbg( p_demux, "Multipart MIME detected, using separator: %s",
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p_sys->psz_separator );
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}
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else
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{
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if( strcmp( psz_line, p_sys->psz_separator ) )
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{
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msg_Warn( p_demux, "separator %s does not match %s", psz_line,
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p_sys->psz_separator );
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}
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free( psz_line );
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}
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psz_line = GetLine( p_demux, &i_pos );
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while( psz_line && *psz_line )
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{
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if( !strncasecmp( psz_line, "Content-Type:", 13 ) )
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{
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p_ch = psz_line + 13;
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while( *p_ch != '\0' && ( *p_ch == ' ' || *p_ch == '\t' ) ) p_ch++;
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if( strncasecmp( p_ch, "image/jpeg", 10 ) )
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{
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msg_Warn( p_demux, "%s, image/jpeg is expected", psz_line );
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b_jpeg = false;
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}
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else
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{
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b_jpeg = true;
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}
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}
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else
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{
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msg_Dbg( p_demux, "discard MIME header: %s", psz_line );
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}
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free( psz_line );
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psz_line = GetLine( p_demux, &i_pos );
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}
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if( NULL == psz_line )
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{
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msg_Err( p_demux, "no EOL" );
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*p_header_size = -3;
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return false;
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}
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free( psz_line );
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*p_header_size = i_pos;
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return b_jpeg;
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}
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static int SendBlock( demux_t *p_demux, int i )
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{
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demux_sys_t *p_sys = p_demux->p_sys;
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block_t *p_block;
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if( ( p_block = stream_Block( p_demux->s, i ) ) == NULL )
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{
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msg_Warn( p_demux, "cannot read data" );
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return 0;
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}
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if( !p_sys->i_frame_length || !p_sys->i_time )
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{
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p_sys->i_time = p_block->i_dts = p_block->i_pts = mdate();
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}
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else
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{
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p_block->i_dts = p_block->i_pts = VLC_TS_0 + p_sys->i_time;
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p_sys->i_time += p_sys->i_frame_length;
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}
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/* set PCR */
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es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block->i_pts );
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es_out_Send( p_demux->out, p_sys->p_es, p_block );
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if( p_sys->b_still )
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{
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p_sys->i_still_end = mdate() + p_sys->i_still_length;
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}
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return 1;
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}
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/*****************************************************************************
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* Open: check file and initializes structures
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*****************************************************************************/
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static int Open( vlc_object_t * p_this )
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{
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demux_t *p_demux = (demux_t*)p_this;
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demux_sys_t *p_sys;
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int i_size;
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bool b_matched = false;
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float f_fps;
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p_demux->pf_control = Control;
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p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
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p_sys->p_es = NULL;
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p_sys->i_time = 0;
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p_sys->i_level = 0;
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p_sys->psz_separator = NULL;
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p_sys->i_frame_size_estimate = 15 * 1024;
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b_matched = CheckMimeHeader( p_demux, &i_size);
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if( b_matched )
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{
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p_demux->pf_demux = MimeDemux;
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stream_Read( p_demux->s, NULL, i_size );
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}
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else if( 0 == i_size )
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{
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/* 0xffd8 identify a JPEG SOI */
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if( p_sys->p_peek[0] == 0xFF && p_sys->p_peek[1] == 0xD8 )
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{
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msg_Dbg( p_demux, "JPEG SOI marker detected" );
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p_demux->pf_demux = MjpgDemux;
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p_sys->i_level++;
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}
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else
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{
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goto error;
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}
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}
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else
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{
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goto error;
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}
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f_fps = var_CreateGetFloat( p_demux, "mjpeg-fps" );
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p_sys->i_frame_length = 0;
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/* Check for jpeg file extension */
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p_sys->b_still = false;
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p_sys->i_still_end = 0;
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if( demux_IsPathExtension( p_demux, ".jpeg" ) ||
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demux_IsPathExtension( p_demux, ".jpg" ) )
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{
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p_sys->b_still = true;
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if( f_fps )
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{
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p_sys->i_still_length = 1000000.0 / f_fps;
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}
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else
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{
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/* Defaults to 1fps */
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p_sys->i_still_length = 1000000;
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}
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}
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else if ( f_fps )
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{
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p_sys->i_frame_length = 1000000.0 / f_fps;
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}
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es_format_Init( &p_sys->fmt, VIDEO_ES, 0 );
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p_sys->fmt.i_codec = VLC_CODEC_MJPG;
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p_sys->p_es = es_out_Add( p_demux->out, &p_sys->fmt );
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return VLC_SUCCESS;
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error:
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free( p_sys );
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return VLC_EGENERIC;
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}
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/*****************************************************************************
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* Demux: read packet and send them to decoders
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*****************************************************************************
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* Returns -1 in case of error, 0 in case of EOF, 1 otherwise
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*****************************************************************************/
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static int MjpgDemux( demux_t *p_demux )
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{
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demux_sys_t *p_sys = p_demux->p_sys;
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int i;
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if( p_sys->b_still && p_sys->i_still_end )
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{
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/* Still frame, wait until the pause delay is gone */
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mwait( p_sys->i_still_end );
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p_sys->i_still_end = 0;
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return 1;
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}
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if( !Peek( p_demux, true ) )
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{
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msg_Warn( p_demux, "cannot peek data" );
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return 0;
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}
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if( p_sys->i_data_peeked < 4 )
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{
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msg_Warn( p_demux, "data shortage" );
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return 0;
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}
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i = 3;
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FIND_NEXT_EOI:
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while( !( 0xFF == p_sys->p_peek[i-1] && 0xD9 == p_sys->p_peek[i] ) )
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{
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if( 0xFF == p_sys->p_peek[i-1] && 0xD8 == p_sys->p_peek[i] )
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{
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p_sys->i_level++;
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msg_Dbg( p_demux, "we found another JPEG SOI at %d", i );
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}
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i++;
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if( i >= p_sys->i_data_peeked )
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{
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msg_Dbg( p_demux, "did not find JPEG EOI in %d bytes",
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p_sys->i_data_peeked );
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if( !Peek( p_demux, false ) )
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{
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msg_Warn( p_demux, "no more data is available at the moment" );
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return 0;
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}
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}
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}
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i++;
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msg_Dbg( p_demux, "JPEG EOI detected at %d", i );
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p_sys->i_level--;
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if( p_sys->i_level > 0 )
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goto FIND_NEXT_EOI;
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return SendBlock( p_demux, i );
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}
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static int MimeDemux( demux_t *p_demux )
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{
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demux_sys_t *p_sys = p_demux->p_sys;
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int i_size, i;
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bool b_match = CheckMimeHeader( p_demux, &i_size );
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if( i_size > 0 )
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{
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stream_Read( p_demux->s, NULL, i_size );
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}
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else if( i_size < 0 )
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{
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return 0;
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}
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else
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{
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// No MIME header, assume OK
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b_match = true;
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}
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if( !Peek( p_demux, true ) )
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{
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msg_Warn( p_demux, "cannot peek data" );
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return 0;
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}
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i = 0;
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i_size = strlen( p_sys->psz_separator ) + 2;
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if( p_sys->i_data_peeked < i_size )
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{
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msg_Warn( p_demux, "data shortage" );
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return 0;
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}
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for( ;; )
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{
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while( !( p_sys->p_peek[i] == '-' && p_sys->p_peek[i+1] == '-' ) )
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{
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i++;
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i_size++;
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if( i_size >= p_sys->i_data_peeked )
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{
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msg_Dbg( p_demux, "MIME boundary not found in %d bytes of "
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"data", p_sys->i_data_peeked );
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if( !Peek( p_demux, false ) )
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{
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msg_Warn( p_demux, "no more data is available at the "
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"moment" );
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return 0;
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}
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}
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}
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if( !strncmp( p_sys->psz_separator, (char *)(p_sys->p_peek + i + 2),
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strlen( p_sys->psz_separator ) ) )
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{
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break;
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}
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i++;
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i_size++;
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}
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if( !b_match )
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{
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msg_Err( p_demux, "discard non-JPEG part" );
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stream_Read( p_demux->s, NULL, i );
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return 0;
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}
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return SendBlock( p_demux, i );
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}
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/*****************************************************************************
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* Close: frees unused data
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*****************************************************************************/
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static void Close ( vlc_object_t * p_this )
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{
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demux_t *p_demux = (demux_t*)p_this;
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demux_sys_t *p_sys = p_demux->p_sys;
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free( p_sys->psz_separator );
|
|
free( p_sys );
|
|
}
|
|
|
|
/*****************************************************************************
|
|
* Control:
|
|
*****************************************************************************/
|
|
static int Control( demux_t *p_demux, int i_query, va_list args )
|
|
{
|
|
return demux_vaControlHelper( p_demux->s, 0, 0, 0, 0, i_query, args );
|
|
}
|