mosaic_bridge.c

video linux conference

/*****************************************************************************
 * mosaic_bridge.c:
 *****************************************************************************
 * Copyright (C) 2004-2005 VideoLAN
 * $Id: mosaic_bridge.c 11088 2005-05-20 18:16:33Z massiot $
 *
 * Authors: Antoine Cellerier <[e-mail]>
 *          Christophe Massiot <[e-mail]>
 *
 * 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 <errno.h>                                                 /* ENOMEM */
#include <stdlib.h>                                                /* free() */
#include <string.h>                                            /* strerror() */

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

#include "vlc_image.h"

#include "../video_filter/mosaic.h"

/*****************************************************************************
 * Local structures
 *****************************************************************************/
struct sout_stream_sys_t
{
    bridged_es_t *p_es;
    vlc_mutex_t *p_lock;

    decoder_t       *p_decoder;
    image_handler_t *p_image; /* filter for resizing */
    int i_height, i_width;
    char *psz_id;
    vlc_bool_t b_inited;
};

#define PICTURE_RING_SIZE 64
struct decoder_owner_sys_t
{
    picture_t *pp_pics[PICTURE_RING_SIZE];
};

typedef void (* pf_release_t)( picture_t * );
static void ReleasePicture( picture_t *p_pic )
{
    p_pic->i_refcount--;

    if ( p_pic->i_refcount <= 0 )
    {
        if ( p_pic->p_sys != NULL )
        {
            pf_release_t pf_release = (pf_release_t)p_pic->p_sys;
            p_pic->p_sys = NULL;
            pf_release( p_pic );
        }
        else
        {
            if( p_pic && p_pic->p_data_orig ) free( p_pic->p_data_orig );
            if( p_pic ) free( p_pic );
        }
    }
}

/*****************************************************************************
 * Local prototypes
 *****************************************************************************/
static int  Open    ( vlc_object_t * );
static void Close   ( vlc_object_t * );
static sout_stream_id_t *Add ( sout_stream_t *, es_format_t * );
static int               Del ( sout_stream_t *, sout_stream_id_t * );
static int               Send( sout_stream_t *, sout_stream_id_t *, block_t * );

static void video_del_buffer( decoder_t *, picture_t * );
static picture_t *video_new_buffer( decoder_t * );
static void video_link_picture_decoder( decoder_t *, picture_t * );
static void video_unlink_picture_decoder( decoder_t *, picture_t * );

/*****************************************************************************
 * Module descriptor
 *****************************************************************************/
#define ID_TEXT N_("ID")
#define ID_LONGTEXT N_( \
    "Specify an identifier string for this subpicture" )

#define WIDTH_TEXT N_("Video width")
#define WIDTH_LONGTEXT N_( \
    "Allows you to specify the output video width." )
#define HEIGHT_TEXT N_("Video height")
#define HEIGHT_LONGTEXT N_( \
    "Allows you to specify the output video height." )

#define SOUT_CFG_PREFIX "sout-mosaic-bridge-"

vlc_module_begin();
    set_shortname( _( "Mosaic bridge" ) );
    set_description(_("Mosaic bridge stream output") );
    set_capability( "sout stream", 0 );
    add_shortcut( "mosaic-bridge" );

    add_string( SOUT_CFG_PREFIX "id", "Id", NULL, ID_TEXT, ID_LONGTEXT,
                VLC_FALSE );
    add_integer( SOUT_CFG_PREFIX "width", 0, NULL, WIDTH_TEXT,
                 WIDTH_LONGTEXT, VLC_TRUE );
    add_integer( SOUT_CFG_PREFIX "height", 0, NULL, HEIGHT_TEXT,
                 HEIGHT_LONGTEXT, VLC_TRUE );

    set_callbacks( Open, Close );

    var_Create( p_module->p_libvlc, "mosaic-lock", VLC_VAR_MUTEX );
vlc_module_end();

static const char *ppsz_sout_options[] = {
    "id", "width", "height", NULL
};

/*****************************************************************************
 * Open
 *****************************************************************************/
static int Open( vlc_object_t *p_this )
{
    sout_stream_t     *p_stream = (sout_stream_t *)p_this;
    sout_stream_sys_t *p_sys;
    libvlc_t *p_libvlc = p_this->p_libvlc;
    vlc_value_t val;

    sout_CfgParse( p_stream, SOUT_CFG_PREFIX, ppsz_sout_options,
                   p_stream->p_cfg );

    p_sys          = malloc( sizeof( sout_stream_sys_t ) );
    p_stream->p_sys = p_sys;
    p_sys->b_inited = VLC_FALSE;

    var_Get( p_libvlc, "mosaic-lock", &val );
    p_sys->p_lock = val.p_address;

    var_Get( p_stream, SOUT_CFG_PREFIX "id", &val );
    p_sys->psz_id = val.psz_string;

    var_Get( p_stream, SOUT_CFG_PREFIX "height", &val );
    p_sys->i_height = val.i_int; 

    var_Get( p_stream, SOUT_CFG_PREFIX "width", &val );
    p_sys->i_width = val.i_int; 

    if ( p_sys->i_height || p_sys->i_width )
    {
        p_sys->p_image = image_HandlerCreate( p_stream );
    }

    p_stream->pf_add    = Add;
    p_stream->pf_del    = Del;
    p_stream->pf_send   = Send;

    p_stream->p_sout->i_out_pace_nocontrol++;

    return VLC_SUCCESS;
}

/*****************************************************************************
 * Close
 *****************************************************************************/
static void Close( vlc_object_t * p_this )
{
    sout_stream_t     *p_stream = (sout_stream_t*)p_this;
    sout_stream_sys_t *p_sys = p_stream->p_sys;

    p_stream->p_sout->i_out_pace_nocontrol--;

    if ( p_sys->psz_id )
        free( p_sys->psz_id );

    free( p_sys );
}

static sout_stream_id_t * Add( sout_stream_t *p_stream, es_format_t *p_fmt )
{
    sout_stream_sys_t *p_sys = p_stream->p_sys;
    bridge_t *p_bridge;
    bridged_es_t *p_es;
    int i;

    if ( p_sys->b_inited )
    {
        return NULL;
    }

    /* Create decoder object */
    p_sys->p_decoder = vlc_object_create( p_stream, VLC_OBJECT_DECODER );
    vlc_object_attach( p_sys->p_decoder, p_stream );
    p_sys->p_decoder->p_module = NULL;
    p_sys->p_decoder->fmt_in = *p_fmt;
    p_sys->p_decoder->b_pace_control = VLC_FALSE;
    p_sys->p_decoder->fmt_out = p_sys->p_decoder->fmt_in;
    p_sys->p_decoder->fmt_out.i_extra = 0;
    p_sys->p_decoder->fmt_out.p_extra = 0;
    p_sys->p_decoder->pf_decode_video = 0;
    p_sys->p_decoder->pf_vout_buffer_new = video_new_buffer;
    p_sys->p_decoder->pf_vout_buffer_del = video_del_buffer;
    p_sys->p_decoder->pf_picture_link    = video_link_picture_decoder;
    p_sys->p_decoder->pf_picture_unlink  = video_unlink_picture_decoder;
    p_sys->p_decoder->p_owner = malloc( sizeof(decoder_owner_sys_t) );
    for( i = 0; i < PICTURE_RING_SIZE; i++ )
        p_sys->p_decoder->p_owner->pp_pics[i] = 0;
    //p_sys->p_decoder->p_cfg = p_sys->p_video_cfg;

    p_sys->p_decoder->p_module =
        module_Need( p_sys->p_decoder, "decoder", "$codec", 0 );

    if( !p_sys->p_decoder->p_module )
    {
        msg_Err( p_stream, "cannot find decoder" );
        vlc_object_detach( p_sys->p_decoder );
        vlc_object_destroy( p_sys->p_decoder );
        return NULL;
    }

    p_sys->b_inited = VLC_TRUE;
    vlc_mutex_lock( p_sys->p_lock );

    p_bridge = GetBridge( p_stream );
    if ( p_bridge == NULL )
    {
        libvlc_t *p_libvlc = p_stream->p_libvlc;
        vlc_value_t val;

        p_bridge = malloc( sizeof( bridge_t ) );

        var_Create( p_libvlc, "mosaic-struct", VLC_VAR_ADDRESS );
        val.p_address = p_bridge;
        var_Set( p_libvlc, "mosaic-struct", val );

        p_bridge->i_es_num = 0;
        p_bridge->pp_es = NULL;
    }

    for ( i = 0; i < p_bridge->i_es_num; i++ )
    {
        if ( p_bridge->pp_es[i]->b_empty )
            break;