mpjpeg.c 4.83 KB
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/*****************************************************************************
 * mpjpeg.c: mime multipart jpeg  muxer module for vlc
 *****************************************************************************
 * Copyright (C) 2001, 2002 VideoLAN
 * $Id: dummy.c 7047 2004-03-11 17:37:50Z fenrir $
 *
 * Authors: Sigmund Augdal <sigmunau@idi.ntnu.no>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
 *****************************************************************************/

/*****************************************************************************
 * Preamble
 *****************************************************************************/
#include <stdlib.h>

#include <vlc/vlc.h>
#include <vlc/sout.h>

#define SEPARATOR "\n--This Random String\n" \
                  "Content-Type: image/jpeg\n\n"
/*****************************************************************************
 * Module descriptor
 *****************************************************************************/
static int  Open   ( vlc_object_t * );
static void Close  ( vlc_object_t * );

vlc_module_begin();
    set_description( _("Multipart jpeg muxer") );
    set_capability( "sout mux", 5 );
    set_callbacks( Open, Close );
    add_shortcut( "mpjpeg" );
vlc_module_end();

/*****************************************************************************
 * Exported prototypes
 *****************************************************************************/
static int  Capability(sout_mux_t *, int, void *, void * );
static int  AddStream( sout_mux_t *, sout_input_t * );
static int  DelStream( sout_mux_t *, sout_input_t * );
static int  Mux      ( sout_mux_t * );

struct sout_mux_sys_t
{
    block_t *p_separator;
    vlc_bool_t b_send_headers;
};

/*****************************************************************************
 * Open:
 *****************************************************************************/
static int Open( vlc_object_t *p_this )
{
    sout_mux_t *p_mux = (sout_mux_t*)p_this;
    sout_mux_sys_t  *p_sys;

    msg_Dbg( p_mux, "Multipart jpeg muxer opened" );

    p_mux->pf_capacity  = Capability;
    p_mux->pf_addstream = AddStream;
    p_mux->pf_delstream = DelStream;
    p_mux->pf_mux       = Mux;

    p_sys = p_mux->p_sys = malloc( sizeof(sout_mux_sys_t) );
    p_sys->b_send_headers = VLC_TRUE;
    p_sys->p_separator = block_New( p_mux, sizeof(SEPARATOR) - 1 );
    memcpy( p_sys->p_separator->p_buffer, SEPARATOR, sizeof(SEPARATOR) - 1 );

    return VLC_SUCCESS;
}

/*****************************************************************************
 * Close:
 *****************************************************************************/

static void Close( vlc_object_t * p_this )
{
    sout_mux_t *p_mux = (sout_mux_t*)p_this;
    sout_mux_sys_t *p_sys = p_mux->p_sys;

    msg_Dbg( p_mux, "Multipart jpeg muxer closed" );
    block_Release( p_sys->p_separator );
    free( p_sys );
}

static int Capability( sout_mux_t *p_mux, int i_query,
                       void *p_args, void *p_answer )
{
    return SOUT_MUX_CAP_ERR_UNIMPLEMENTED;
}

static int AddStream( sout_mux_t *p_mux, sout_input_t *p_input )
{
    msg_Dbg( p_mux, "adding input" );
    if( p_input->p_fmt->i_codec != VLC_FOURCC('M','J','P','G') )
    {
        return VLC_EGENERIC;
    }
    return VLC_SUCCESS;
}

static int DelStream( sout_mux_t *p_mux, sout_input_t *p_input )
{
    msg_Dbg( p_mux, "removing input" );
    return VLC_SUCCESS;
}

static int Mux( sout_mux_t *p_mux )
{
    block_fifo_t *p_fifo;
    sout_mux_sys_t *p_sys = p_mux->p_sys;
    int i_count;
    if( p_sys->b_send_headers )
    {
        block_t *p_header = block_New( p_mux, sizeof(SEPARATOR) - 2);
        memcpy( p_header->p_buffer, &SEPARATOR[1], sizeof(SEPARATOR) - 2 );
        p_header->i_flags |= BLOCK_FLAG_HEADER;
        sout_AccessOutWrite( p_mux->p_access, p_header );
        p_sys->b_send_headers = VLC_FALSE;
    }
    p_fifo = p_mux->pp_inputs[0]->p_fifo;
    i_count = p_fifo->i_depth;
    while( i_count > 0 )
    {
        block_t *p_data = block_FifoGet( p_fifo );
        sout_AccessOutWrite( p_mux->p_access,
                             block_Duplicate( p_sys->p_separator ) );
        sout_AccessOutWrite( p_mux->p_access, p_data );

        i_count--;
    }

    return VLC_SUCCESS;
}