/*****************************************************************************

 * vc1.c : VC1 Video demuxer

 *****************************************************************************

 * Copyright (C) 2002-2004 VLC authors and VideoLAN

 *

 * Authors: Laurent Aimar <fenrir@via.ecp.fr>

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms of the GNU Lesser General Public License as published by

 * the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public License

 * along with this program; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.

 *****************************************************************************/

/*****************************************************************************

 * Preamble

 *****************************************************************************/

#ifdef HAVE_CONFIG_H

# include "config.h"

#endif

#include <vlc_common.h>

#include <vlc_plugin.h>

#include <vlc_demux.h>

#include <vlc_codec.h>

/*****************************************************************************

 * Module descriptor

 *****************************************************************************/

static int  Open ( vlc_object_t * );

static void Close( vlc_object_t * );

#define FPS_TEXT N_("Frames per Second")

#define FPS_LONGTEXT N_("Desired frame rate for the VC-1 stream.")

vlc_module_begin ()

    set_shortname( "VC-1")

    set_subcategory( SUBCAT_INPUT_DEMUX )

    set_description( N_("VC1 video demuxer" ) )

    set_capability( "demux", 0 )

    add_float( "vc1-fps", 25.0, FPS_TEXT, FPS_LONGTEXT )

    set_callbacks( Open, Close )

    add_shortcut( "vc1" )

vlc_module_end ()

/*****************************************************************************

 * Local prototypes

 *****************************************************************************/

typedef struct

{

    vlc_tick_t  i_dts;

    es_out_id_t *p_es;

    float       f_fps;

    decoder_t *p_packetizer;

} demux_sys_t;

static int Demux( demux_t * );

static int Control( demux_t *, int, va_list );

#define VC1_PACKET_SIZE 4096

/*****************************************************************************

 * Open: initializes demux structures

 *****************************************************************************/

static int Open( vlc_object_t * p_this )

{

    demux_t     *p_demux = (demux_t*)p_this;

    demux_sys_t *p_sys;

    const uint8_t *p_peek;

    es_format_t fmt;

    if( vlc_stream_Peek( p_demux->s, &p_peek, 4 ) < 4 ) return VLC_EGENERIC;

    if( p_peek[0] != 0x00 || p_peek[1] != 0x00 ||

        p_peek[2] != 0x01 || p_peek[3] != 0x0f ) /* Sequence header */

    {

        if( !p_demux->obj.force )

        {

            msg_Warn( p_demux, "vc-1 module discarded (no startcode)" );

            return VLC_EGENERIC;

        }

        msg_Err( p_demux, "this doesn't look like a VC-1 ES stream, "

                 "continuing anyway" );

    }

    p_sys = malloc( sizeof( demux_sys_t ) );

    if( unlikely(p_sys == NULL) )

        return VLC_ENOMEM;

    p_demux->pf_demux  = Demux;

    p_demux->pf_control= Control;

    p_demux->p_sys     = p_sys;

    p_sys->p_es        = NULL;

    p_sys->i_dts       = 0;

    p_sys->f_fps = var_CreateGetFloat( p_demux, "vc1-fps" );

    if( p_sys->f_fps < 0.001f )

        p_sys->f_fps = 0.0f;

    /* Load the packetizer */

    es_format_Init( &fmt, VIDEO_ES, VLC_CODEC_VC1 );

    p_sys->p_packetizer = demux_PacketizerNew( VLC_OBJECT(p_demux), &fmt, "VC-1" );

    if( !p_sys->p_packetizer )

    {

        free( p_sys );

        return VLC_EGENERIC;

    }

    return VLC_SUCCESS;

}

/*****************************************************************************

 * Close: frees unused data

 *****************************************************************************/

static void Close( vlc_object_t * p_this )

{

    demux_t     *p_demux = (demux_t*)p_this;

    demux_sys_t *p_sys = p_demux->p_sys;

    demux_PacketizerDestroy( p_sys->p_packetizer );

    free( p_sys );

}

/*****************************************************************************

 * Demux: reads and demuxes data packets

 *****************************************************************************

 * Returns -1 in case of error, 0 in case of EOF, 1 otherwise

 *****************************************************************************/

static int Demux( demux_t *p_demux)

{

    demux_sys_t *p_sys = p_demux->p_sys;

    block_t *p_block_in, *p_block_out;

    bool b_eof = false;

    p_block_in = vlc_stream_Block( p_demux->s, VC1_PACKET_SIZE );

    if( p_block_in == NULL )

    {

        b_eof = true;

    }

    else

    {

        /*  */

        p_block_in->i_dts = p_sys->i_dts != VLC_TICK_INVALID ? p_sys->i_dts : VLC_TICK_0;

        p_block_in->i_pts = p_block_in->i_dts;

    }

    while( (p_block_out = p_sys->p_packetizer->pf_packetize( p_sys->p_packetizer,

                                                             p_block_in ? &p_block_in : NULL )) )

    {

        while( p_block_out )

        {

            block_t *p_next = p_block_out->p_next;

            p_block_out->p_next = NULL;

            if( p_sys->p_es == NULL )

            {

                p_sys->p_packetizer->fmt_out.b_packetized = true;

                p_sys->p_packetizer->fmt_out.i_id = 0;

                p_sys->p_es = es_out_Add( p_demux->out, &p_sys->p_packetizer->fmt_out);

            }

            es_out_SetPCR( p_demux->out, VLC_TICK_0 + p_sys->i_dts );

            p_block_out->i_dts = VLC_TICK_0 + p_sys->i_dts;

            p_block_out->i_pts = VLC_TICK_0 + p_sys->i_dts;

            if( likely(p_sys->p_es) )

                es_out_Send( p_demux->out, p_sys->p_es, p_block_out );

            else

            {

                block_Release( p_block_out );

                b_eof = true;

            }

            p_block_out = p_next;

            if( p_sys->p_packetizer->fmt_out.video.i_frame_rate > 0 &&

                p_sys->p_packetizer->fmt_out.video.i_frame_rate_base > 0 )

                p_sys->i_dts += vlc_tick_from_samples(

                    p_sys->p_packetizer->fmt_out.video.i_frame_rate_base,

                    p_sys->p_packetizer->fmt_out.video.i_frame_rate );

            else if( p_sys->f_fps > 0.001f )

                p_sys->i_dts += (vlc_tick_t)((float) CLOCK_FREQ / p_sys->f_fps);

            else

                p_sys->i_dts += VLC_TICK_FROM_MS(40);

        }

    }

    return b_eof ? VLC_DEMUXER_EOF : VLC_DEMUXER_SUCCESS;

}

/*****************************************************************************

 * Control:

 *****************************************************************************/

static int Control( demux_t *p_demux, int i_query, va_list args )

{

    /* demux_sys_t *p_sys  = p_demux->p_sys; */

    /* FIXME calculate the bitrate */

    if( i_query == DEMUX_SET_TIME )

        return VLC_EGENERIC;

    else

        return demux_vaControlHelper( p_demux->s,

                                       0, -1,

                                       0, 1, i_query, args );

}