/*****************************************************************************
 * csri.c : Load CSRI subtitle renderer
 *****************************************************************************
 * Copyright (C) 2007 the VideoLAN team
 * $Id$
 *
 * Authors: David Lamparter <equinox@videolan.org>
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
 *****************************************************************************/

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

#ifdef HAVE_LINUX_LIMITS_H
#   include <linux/limits.h>
#endif

#include "config.h"
#include <vlc/vlc.h>
#include <vlc_vout.h>
#include <vlc_codec.h>
#include <vlc_osd.h>
#include <vlc_block.h>
#include <vlc_filter.h>
#include <vlc_stream.h>
#include <vlc_xml.h>

#include <math.h>

#ifdef HAVE_ERRNO_H
#   include <errno.h>
#endif

#include <csri/csri.h>
#include <csri/stream.h>

/*****************************************************************************
 * Local prototypes
 *****************************************************************************/
static int  Create ( vlc_object_t * );
static void Destroy( vlc_object_t * );

static subpicture_t *DecodeBlock( decoder_t *, block_t ** );
static void DestroySubpicture( subpicture_t * );
static void PreRender( video_format_t *, spu_t *, subpicture_t *, mtime_t );
static subpicture_region_t *UpdateRegions( video_format_t *, spu_t *,
                                           subpicture_t *, mtime_t );

/*****************************************************************************
 * Module descriptor
 *****************************************************************************/

vlc_module_begin();
    set_shortname( _("Subtitles (advanced)"));
    set_description( _("Wrapper for subtitle renderers using CSRI/asa") );
    set_capability( "decoder", 60 );
    set_category( CAT_INPUT );
    set_subcategory( SUBCAT_INPUT_SCODEC );
    set_callbacks( Create, Destroy );
vlc_module_end();

/*****************************************************************************
 * decoder_sys_t: filter data
 *****************************************************************************/
struct decoder_sys_t
{
    subpicture_t *p_spu_final;
    video_format_t fmt_cached;
    csri_inst *p_instance;
    void (*pf_push_packet)(csri_inst *inst, const void *packet,
                           size_t packetlen, double pts_start,
                           double pts_end);
};

struct subpicture_sys_t
{
    decoder_t *p_dec;
    void *p_subs_data;
    int i_subs_len;
};

/*****************************************************************************
 * Create: Open CSRI renderer
 *****************************************************************************
 * Comment me.
 *****************************************************************************/
static int Create( vlc_object_t *p_this )
{
    decoder_t *p_dec = (decoder_t *)p_this;
    decoder_sys_t *p_sys;
    csri_rend *p_render;
    struct csri_stream_ext *p_streamext;

    if( p_dec->fmt_in.i_codec != VLC_FOURCC('s','s','a',' ') )
    {
        return VLC_EGENERIC;
    }

    p_render = csri_renderer_default();
    if (!p_render)
    {
        msg_Err( p_dec, "can't load csri renderer" );
        return VLC_EGENERIC;
    }
    p_streamext = csri_query_ext(p_render, CSRI_EXT_STREAM_ASS);
    if (!p_streamext)
    {
        msg_Err( p_dec, "csri renderer does not support ASS streaming" );
        return VLC_EGENERIC;
    }

    p_dec->pf_decode_sub = DecodeBlock;

    p_dec->p_sys = p_sys = malloc( sizeof( decoder_sys_t ) );
    if( !p_sys )
    {
        msg_Err( p_dec, "out of memory" );
        return VLC_ENOMEM;
    }
    memset( &p_dec->p_sys->fmt_cached, 0, sizeof( p_dec->p_sys->fmt_cached ) );

    p_sys->pf_push_packet = p_streamext->push_packet;
    p_sys->p_instance = p_streamext->init_stream(p_render,
                                                 p_dec->fmt_in.p_extra,
                                                 p_dec->fmt_in.i_extra - 1,
                                                 NULL);
    return VLC_SUCCESS;
}

/*****************************************************************************
 * Destroy: finish
 *****************************************************************************
 * Comment me.
 *****************************************************************************/
static void Destroy( vlc_object_t *p_this )
{
    filter_t *p_filter = (filter_t *)p_this;
    filter_sys_t *p_sys = p_filter->p_sys;

    free( p_sys );
}

/****************************************************************************
 * DecodeBlock: the whole thing
 ****************************************************************************
 * This function must be fed with complete subtitles units.
 ****************************************************************************/
static subpicture_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
{
    subpicture_t *p_spu = NULL;
    block_t *p_block;

    msg_Dbg( p_dec, "DecodeBlock %p", (void *)pp_block);
    if( !pp_block || *pp_block == NULL ) return NULL;
    p_block = *pp_block;
    if( p_block->i_buffer == 0 || p_block->p_buffer[0] == '\0' ) return NULL;

    p_spu = p_dec->pf_spu_buffer_new( p_dec );
    if( !p_spu )
    {
        msg_Warn( p_dec, "can't get spu buffer" );
        block_Release( *pp_block );
        *pp_block = NULL;
        return NULL;
    }

    p_spu->p_sys = malloc( sizeof( subpicture_sys_t ));
    if( !p_spu->p_sys )
    {
        msg_Err( p_dec, "out of memory" );
        p_dec->pf_spu_buffer_del( p_dec, p_spu );
        block_Release( *pp_block );
        *pp_block = NULL;
        return NULL;
    }
    p_spu->p_sys->p_dec = p_dec;

    p_spu->p_sys->i_subs_len = p_block->i_buffer;
    p_spu->p_sys->p_subs_data = malloc( p_block->i_buffer );
    if( !p_spu->p_sys->p_subs_data )
    {
        msg_Err( p_dec, "out of memory" );
        free( p_spu->p_sys );
        p_dec->pf_spu_buffer_del( p_dec, p_spu );
        block_Release( *pp_block );
        *pp_block = NULL;
        return NULL;
    }
    memcpy( p_spu->p_sys->p_subs_data, p_block->p_buffer,
            p_block->i_buffer );

    p_spu->i_x = 0;
    p_spu->i_y = 0;
    p_spu->i_start = p_block->i_pts;
    p_spu->i_stop = p_block->i_pts + p_block->i_length;
    p_spu->b_ephemer = VLC_FALSE;
    p_spu->b_absolute = VLC_FALSE;
    p_spu->b_pausable = VLC_TRUE;

    msg_Dbg( p_dec, "BS %lf..%lf", p_spu->i_start * 0.000001, p_spu->i_stop * 0.000001);
    p_dec->p_sys->pf_push_packet(p_dec->p_sys->p_instance,
                                 p_spu->p_sys->p_subs_data, p_block->i_buffer,
                                 p_spu->i_start * 0.000001,
                                 p_spu->i_stop * 0.000001);

    p_spu->pf_pre_render = PreRender;
    p_spu->pf_update_regions = UpdateRegions;
    p_spu->pf_destroy = DestroySubpicture;

    block_Release( *pp_block );
    *pp_block = NULL;

    return p_spu;
}

static void DestroySubpicture( subpicture_t *p_subpic )
{
    msg_Dbg( p_subpic->p_sys->p_dec, "drop spu %p", (void *)p_subpic );
    free( p_subpic->p_sys->p_subs_data );
    free( p_subpic->p_sys );
}

static void PreRender( video_format_t *p_fmt, spu_t *p_spu,
                       subpicture_t *p_subpic, mtime_t ts )
{
    decoder_t *p_dec = p_subpic->p_sys->p_dec;
    p_dec->p_sys->p_spu_final = p_subpic;
}

static subpicture_region_t *UpdateRegions( video_format_t *p_fmt, spu_t *p_spu,
                                           subpicture_t *p_subpic, mtime_t ts )
{
    decoder_t *p_dec = p_subpic->p_sys->p_dec;
    subpicture_region_t *p_spu_region;
    video_format_t fmt;
    struct csri_frame csri_frame;

    if (p_subpic != p_dec->p_sys->p_spu_final)
    {
        return NULL;
    }

    memcpy( &fmt, p_fmt, sizeof( fmt ) );
    fmt.i_chroma = VLC_FOURCC('R','G','B','A');
    fmt.i_width = fmt.i_visible_width;
    fmt.i_height = fmt.i_visible_height;
    fmt.i_bits_per_pixel = 0;
    fmt.i_x_offset = fmt.i_y_offset = 0;

    if (memcmp(&fmt, &p_dec->p_sys->fmt_cached, sizeof(fmt)))
    {
        struct csri_fmt csri_fmt;
        memset(&csri_fmt, 0, sizeof(csri_fmt));
        csri_fmt.pixfmt = CSRI_F_RGBA;
        csri_fmt.width = fmt.i_width;
        csri_fmt.height = fmt.i_height;
        if( csri_request_fmt(p_dec->p_sys->p_instance, &csri_fmt) )
            msg_Dbg( p_dec, "csri error: format not supported" );

        memcpy(&p_dec->p_sys->fmt_cached, &fmt, sizeof(fmt));
    }

    p_spu_region = p_subpic->pf_create_region( VLC_OBJECT(p_dec), &fmt );
    p_spu_region->i_align = SUBPICTURE_ALIGN_TOP;

    csri_frame.pixfmt = CSRI_F_RGBA;
    csri_frame.planes[0] = (unsigned char*)p_spu_region->picture.Y_PIXELS;
    csri_frame.strides[0] = p_spu_region->picture.Y_PITCH;

    msg_Dbg( p_dec, "TS %lf", ts * 0.000001 );
    csri_render( p_dec->p_sys->p_instance, &csri_frame, ts * 0.000001 );
    memset(p_spu_region->picture.Y_PIXELS, 0xff, fmt.i_width);
    memset(p_spu_region->picture.Y_PIXELS + p_spu_region->picture.Y_PITCH
                    * (fmt.i_height - 1), 0x88, fmt.i_width);

    p_subpic->p_region = p_spu_region;
    return p_spu_region;
}

