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426 lines
13 KiB
426 lines
13 KiB
/*****************************************************************************
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* cdg.c: CDG decoder module
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*****************************************************************************
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* Copyright (C) 2007 Laurent Aimar
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*
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* Authors: 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 it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* 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_codec.h>
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/*****************************************************************************
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* decoder_sys_t : decoder descriptor
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*****************************************************************************/
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/* The screen size */
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#define CDG_SCREEN_WIDTH 300u
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#define CDG_SCREEN_HEIGHT 216u
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/* The border of the screen size */
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#define CDG_SCREEN_BORDER_WIDTH 6u
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#define CDG_SCREEN_BORDER_HEIGHT 12u
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/* The display part */
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#define CDG_DISPLAY_WIDTH (CDG_SCREEN_WIDTH-2*CDG_SCREEN_BORDER_WIDTH)
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#define CDG_DISPLAY_HEIGHT (CDG_SCREEN_HEIGHT-2*CDG_SCREEN_BORDER_HEIGHT)
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#define CDG_SCREEN_PITCH CDG_SCREEN_WIDTH
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typedef struct
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{
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uint8_t color[16][3];
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unsigned i_offseth;
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unsigned i_offsetv;
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uint8_t screen[CDG_SCREEN_PITCH*CDG_SCREEN_HEIGHT];
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uint8_t *p_screen;
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int i_packet;
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} decoder_sys_t;
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#define CDG_PACKET_SIZE 24u
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#define CDG_COLOR_R_SHIFT 0
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#define CDG_COLOR_G_SHIFT 8
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#define CDG_COLOR_B_SHIFT 16
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/*****************************************************************************
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* Local prototypes
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*****************************************************************************/
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static int Open ( vlc_object_t * );
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static int Decode( decoder_t *, block_t * );
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static int DecodePacket( decoder_sys_t *p_cdg, uint8_t *p_buffer, int i_buffer );
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static void Flush( decoder_t * );
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static int Render( decoder_sys_t *p_cdg, picture_t *p_picture );
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/*****************************************************************************
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* Module descriptor
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*****************************************************************************/
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vlc_module_begin ()
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set_category( CAT_INPUT )
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set_subcategory( SUBCAT_INPUT_VCODEC )
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set_description( N_("CDG video decoder") )
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set_capability( "video decoder", 1000 )
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set_callback( Open )
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add_shortcut( "cdg" )
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vlc_module_end ()
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/*****************************************************************************
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* Open: probe the decoder and return score
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*****************************************************************************/
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static int Open( vlc_object_t *p_this )
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{
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decoder_t *p_dec = (decoder_t*)p_this;
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decoder_sys_t *p_sys;
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if( p_dec->fmt_in.i_codec != VLC_CODEC_CDG )
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return VLC_EGENERIC;
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/* Allocate the memory needed to store the decoder's structure */
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p_dec->p_sys = p_sys = vlc_obj_calloc( p_this, 1, sizeof(decoder_sys_t) );
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if( !p_sys )
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return VLC_ENOMEM;
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/* Init */
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p_sys->p_screen = p_sys->screen;
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p_sys->i_packet = 0;
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/* Set output properties
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* TODO maybe it would be better to use RV16 or RV24 ? */
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p_dec->fmt_out.i_codec = VLC_CODEC_RGB32;
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p_dec->fmt_out.video.i_width = CDG_DISPLAY_WIDTH;
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p_dec->fmt_out.video.i_height = CDG_DISPLAY_HEIGHT;
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p_dec->fmt_out.video.i_sar_num = 1;
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p_dec->fmt_out.video.i_sar_den = 1;
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p_dec->fmt_out.video.i_rmask = 0xff << CDG_COLOR_R_SHIFT;
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p_dec->fmt_out.video.i_gmask = 0xff << CDG_COLOR_G_SHIFT;
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p_dec->fmt_out.video.i_bmask = 0xff << CDG_COLOR_B_SHIFT;
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/* Set callbacks */
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p_dec->pf_decode = Decode;
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p_dec->pf_flush = Flush;
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return VLC_SUCCESS;
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}
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/*****************************************************************************
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* Flush:
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*****************************************************************************/
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static void Flush( decoder_t *p_dec )
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{
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decoder_sys_t *p_sys = p_dec->p_sys;
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p_sys->i_packet = 0;
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}
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/****************************************************************************
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* Decode: the whole thing
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****************************************************************************
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* This function must be fed with a complete compressed frame.
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****************************************************************************/
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static int Decode( decoder_t *p_dec, block_t *p_block )
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{
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decoder_sys_t *p_sys = p_dec->p_sys;
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picture_t *p_pic = NULL;
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if( !p_block ) /* No Drain */
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return VLCDEC_SUCCESS;
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if( p_block->i_flags & BLOCK_FLAG_CORRUPTED )
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{
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Flush( p_dec );
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goto exit;
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}
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/* Decode packet */
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while( p_block->i_buffer >= CDG_PACKET_SIZE )
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{
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DecodePacket( p_sys, p_block->p_buffer, CDG_PACKET_SIZE );
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p_block->i_buffer -= CDG_PACKET_SIZE;
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p_block->p_buffer += CDG_PACKET_SIZE;
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}
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/* Only display 25 frame per second (there is 75 packets per second) */
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if( (p_sys->i_packet%3) == 1 && p_block->i_pts == p_block->i_dts )
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{
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/* Get a new picture */
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if( decoder_UpdateVideoFormat( p_dec ) )
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goto exit;
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p_pic = decoder_NewPicture( p_dec );
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if( !p_pic )
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goto exit;
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Render( p_sys, p_pic );
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p_pic->date = p_block->i_pts != VLC_TICK_INVALID ? p_block->i_pts : p_block->i_dts;
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}
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exit:
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block_Release( p_block );
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if( p_pic != NULL )
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decoder_QueueVideo( p_dec, p_pic );
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return VLCDEC_SUCCESS;
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}
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/*****************************************************************************
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* Decoder
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*****************************************************************************/
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static void ScreenFill( decoder_sys_t *p_cdg, int sx, int sy, int dx, int dy, int c )
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{
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int x, y;
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for( y = sy; y < sy+dy; y++ )
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for( x = sx; x < sx+dx; x++ )
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p_cdg->p_screen[y*CDG_SCREEN_PITCH+x] = c;
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}
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static int DecodeMemoryPreset( decoder_sys_t *p_cdg, const uint8_t *p_data )
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{
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const int i_color = p_data[0]&0x0f;
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#if 0
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const int i_repeat= p_data[1]&0x0f;
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#endif
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/* if i_repeat > 0 we could ignore it if we have a reliable stream */
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ScreenFill( p_cdg, 0, 0, CDG_SCREEN_WIDTH, CDG_SCREEN_HEIGHT, i_color );
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return 0;
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}
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static int DecodeBorderPreset( decoder_sys_t *p_cdg, const uint8_t *p_data )
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{
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const int i_color = p_data[0]&0x0f;
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/* */
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ScreenFill( p_cdg, 0, 0,
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CDG_SCREEN_WIDTH, CDG_SCREEN_BORDER_HEIGHT, i_color );
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ScreenFill( p_cdg, 0, CDG_SCREEN_HEIGHT-CDG_SCREEN_BORDER_HEIGHT,
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CDG_SCREEN_WIDTH, CDG_SCREEN_BORDER_HEIGHT, i_color );
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ScreenFill( p_cdg, 0, CDG_SCREEN_BORDER_HEIGHT,
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CDG_SCREEN_BORDER_WIDTH, CDG_SCREEN_HEIGHT-CDG_SCREEN_BORDER_HEIGHT, i_color );
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ScreenFill( p_cdg, CDG_SCREEN_WIDTH-CDG_SCREEN_BORDER_WIDTH, CDG_SCREEN_BORDER_HEIGHT,
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CDG_SCREEN_BORDER_WIDTH, CDG_SCREEN_HEIGHT-CDG_SCREEN_BORDER_HEIGHT, i_color );
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return 0;
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}
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static int DecodeLoadColorTable( decoder_sys_t *p_cdg, const uint8_t *p_data, int i_base )
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{
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int n;
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for( n = 0; n < 8; n++ )
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{
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const int c = ((p_data[2*n+0] << 8) | p_data[2*n+1]);
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const int r = (c >> 10)&0x0f;
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const int g = ((c >> 6)&0x0c) | ((c >> 4)&0x03);
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const int b = c &0x0f;
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p_cdg->color[i_base+n][0] = r << 4;
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p_cdg->color[i_base+n][1] = g << 4;
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p_cdg->color[i_base+n][2] = b << 4;
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}
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return 0;
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}
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static int DecodeTileBlock( decoder_sys_t *p_cdg, const uint8_t *p_data, int doXor )
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{
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int p_color[2];
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int sx, sy;
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int x, y;
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p_color[0] = p_data[0] & 0x0f;
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p_color[1] = p_data[1] & 0x0f;
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sy = (p_data[2] & 0x1f)*12;
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sx = (p_data[3] & 0x3f)*6;
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for( y = 0; y < 12; y++ )
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{
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for( x = 0; x < 6; x++ )
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{
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const int idx = ( p_data[4+y] >> (5-x) ) & 0x01;
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unsigned index = (sy+y)*CDG_SCREEN_PITCH+(sx+x);
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if( index >= CDG_SCREEN_PITCH*CDG_SCREEN_HEIGHT )
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return 0;
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uint8_t *p = &p_cdg->p_screen[index];
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if( doXor )
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*p ^= p_color[idx];
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else
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*p = p_color[idx];
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}
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}
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return 0;
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}
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static int DecodeScroll( decoder_sys_t *p_cdg, const uint8_t *p_data, int b_copy )
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{
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uint8_t copy[CDG_SCREEN_PITCH*CDG_SCREEN_HEIGHT];
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uint8_t color = p_data[0]&0x0f;
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int i_shifth;
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int i_shiftv;
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/* */
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p_cdg->i_offseth = p_data[1]&0x7;
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if( p_cdg->i_offseth >= CDG_SCREEN_BORDER_WIDTH )
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p_cdg->i_offseth = CDG_SCREEN_BORDER_WIDTH-1;
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p_cdg->i_offsetv = p_data[2]&0xf;
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if( p_cdg->i_offsetv >= CDG_SCREEN_BORDER_HEIGHT )
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p_cdg->i_offsetv = CDG_SCREEN_BORDER_HEIGHT-1;
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/* */
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switch( (p_data[1] >> 4)&0x3 )
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{
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case 0x01: i_shifth = 6; break;
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case 0x02: i_shifth = -6; break;
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default:
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i_shifth = 0;
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break;
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}
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switch( (p_data[2] >> 4)&0x3 )
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{
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case 0x01: i_shiftv = 12; break;
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case 0x02: i_shiftv =-12; break;
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default:
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i_shiftv = 0;
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break;
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}
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if( i_shifth == 0 && i_shiftv == 0 )
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return 0;
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/* Make a copy of the screen */
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memcpy( copy, p_cdg->screen, sizeof(p_cdg->screen) );
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/* Fill the uncovered part XXX way too much */
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ScreenFill( p_cdg, 0, 0, CDG_SCREEN_WIDTH, CDG_SCREEN_HEIGHT, color );
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/* Copy back */
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for( unsigned y = 0; y < CDG_SCREEN_HEIGHT; y++ )
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{
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int dy = i_shiftv + y;
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for( unsigned x = 0; x < CDG_SCREEN_WIDTH; x++ )
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{
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int dx = i_shifth + x;
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if( b_copy )
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{
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dy = (dy + CDG_SCREEN_HEIGHT) % CDG_SCREEN_HEIGHT;
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dx = (dx + CDG_SCREEN_WIDTH ) % CDG_SCREEN_WIDTH;
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}
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else
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{
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if( dy < 0 || (unsigned)dy >= CDG_SCREEN_HEIGHT ||
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dx < 0 || (unsigned)dx >= CDG_SCREEN_WIDTH )
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continue;
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}
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p_cdg->screen[dy*CDG_SCREEN_PITCH+dx] = copy[y*CDG_SCREEN_PITCH+x];
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}
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}
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/* */
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//CdgDebug( CDG_LOG_WARNING, "DecodeScroll: color=%d ch=%d oh=%d cv=%d ov=%d\n copy=%d\n", color, i_shifth, p_cdg->i_offseth, i_shiftv, p_cdg->i_offsetv, b_copy );
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return 0;
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}
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static int DecodePacket( decoder_sys_t *p_cdg, uint8_t *p_buffer, int i_buffer )
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{
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const int i_cmd = p_buffer[0] & 0x3f;
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const int i_instruction = p_buffer[1] & 0x3f;
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const uint8_t *p_data = &p_buffer[4];
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if( i_buffer != CDG_PACKET_SIZE )
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return -1;
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p_cdg->i_packet++;
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/* Handle CDG command only */
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if( i_cmd != 0x09 )
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return 0;
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switch( i_instruction )
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{
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case 1:
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DecodeMemoryPreset( p_cdg, p_data );
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break;
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case 2:
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DecodeBorderPreset( p_cdg, p_data );
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break;
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case 6:
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DecodeTileBlock( p_cdg, p_data, 0 );
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break;
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case 20:
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DecodeScroll( p_cdg, p_data, 0 );
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break;
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case 24:
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DecodeScroll( p_cdg, p_data, 1 );
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break;
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case 28:
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/* FIXME what to do about that one ? */
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//CdgDebug( CDG_LOG_WARNING, "DecodeDefineTransparentColor not implemented\n" );
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//DecodeDefineTransparentColor( p_cdg, p_data );
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break;
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case 30:
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DecodeLoadColorTable( p_cdg, p_data, 0 );
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break;
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case 31:
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DecodeLoadColorTable( p_cdg, p_data, 8 );
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break;
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case 38:
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DecodeTileBlock( p_cdg, p_data, 1 );
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break;
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default:
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break;
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}
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return 0;
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}
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static void RenderPixel( picture_t *p_picture, int x, int y, uint32_t c )
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{
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const int i_plane = 0;
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const int i_pitch = p_picture->p[i_plane].i_pitch;
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uint32_t *s = (uint32_t*)&p_picture->p[i_plane].p_pixels[y*i_pitch + x*sizeof(uint32_t)];
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*s = c;
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}
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static uint32_t RenderRGB( int r, int g, int b )
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{
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return ( r << CDG_COLOR_R_SHIFT ) | ( g << CDG_COLOR_G_SHIFT ) | ( b << CDG_COLOR_B_SHIFT );
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}
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static int Render( decoder_sys_t *p_cdg, picture_t *p_picture )
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{
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for( unsigned y = 0; y < CDG_DISPLAY_HEIGHT; y++ )
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{
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for( unsigned x = 0; x < CDG_DISPLAY_WIDTH; x++ )
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{
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const int sx = x + p_cdg->i_offseth + CDG_SCREEN_BORDER_WIDTH;
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const int sy = y + p_cdg->i_offsetv + CDG_SCREEN_BORDER_HEIGHT;
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uint8_t cidx = p_cdg->p_screen[sy*CDG_SCREEN_PITCH +sx];
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uint8_t r = p_cdg->color[cidx][0];
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uint8_t g = p_cdg->color[cidx][1];
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uint8_t b = p_cdg->color[cidx][2];
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RenderPixel( p_picture, x, y, RenderRGB( r, g, b ) );
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}
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}
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return 0;
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}
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