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709 lines
23 KiB
709 lines
23 KiB
/*****************************************************************************
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* cinepak.c: cinepak video decoder
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*****************************************************************************
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* Copyright (C) 1999-2001 the VideoLAN team
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* $Id$
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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
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
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*****************************************************************************/
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/*****************************************************************************
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* Preamble
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*****************************************************************************/
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#include <vlc/vlc.h>
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#include <vlc/vout.h>
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#include <vlc/decoder.h>
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/*****************************************************************************
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* Module descriptor
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*****************************************************************************/
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static int OpenDecoder ( vlc_object_t * );
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static void CloseDecoder( vlc_object_t * );
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vlc_module_begin();
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set_description( _("Cinepak video decoder") );
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set_capability( "decoder", 100 );
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set_category( CAT_INPUT );
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set_subcategory( SUBCAT_INPUT_VCODEC );
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set_callbacks( OpenDecoder, CloseDecoder );
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vlc_module_end();
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/*****************************************************************************
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* Local prototypes
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*****************************************************************************/
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#define CINEPAK_MAXSTRIP 32
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typedef struct
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{
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uint8_t i_y[4];
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uint8_t i_u, i_v;
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} cinepak_codebook_t;
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typedef struct
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{
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int b_grayscale; /* force to grayscale */
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int i_width;
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int i_height;
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int i_stride_x;
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int i_stride_y;
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uint8_t *p_y, *p_u, *p_v;
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int i_stride[3]; /* our 3 planes */
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int i_lines[3];
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uint8_t *p_pix[3];
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cinepak_codebook_t codebook_v1[CINEPAK_MAXSTRIP][256];
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cinepak_codebook_t codebook_v4[CINEPAK_MAXSTRIP][256];
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} cinepak_context_t;
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/*****************************************************************************
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* decoder_sys_t : decoder descriptor
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*****************************************************************************/
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struct decoder_sys_t
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{
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/*
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* Cinepak properties
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*/
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cinepak_context_t context;
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};
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static picture_t *DecodeBlock ( decoder_t *, block_t ** );
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static int cinepak_decode_frame( cinepak_context_t *, int, uint8_t * );
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/*****************************************************************************
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* OpenDecoder: probe the decoder and return score
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*****************************************************************************
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* Tries to launch a decoder and return score so that the interface is able
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* to chose.
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*****************************************************************************/
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static int OpenDecoder( 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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vlc_value_t val;
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if( p_dec->fmt_in.i_codec != VLC_FOURCC('c','v','i','d') &&
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p_dec->fmt_in.i_codec != VLC_FOURCC('C','V','I','D') )
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{
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return VLC_EGENERIC;
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}
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/* Allocate the memory needed to store the decoder's structure */
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if( ( p_dec->p_sys = p_sys = malloc(sizeof(decoder_sys_t)) ) == NULL )
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{
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msg_Err( p_dec, "out of memory" );
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return VLC_EGENERIC;
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}
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memset( &p_sys->context, 0, sizeof( cinepak_context_t ) );
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var_Create( p_dec, "grayscale", VLC_VAR_BOOL | VLC_VAR_DOINHERIT );
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var_Get( p_dec, "grayscale", &val );
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p_sys->context.b_grayscale = val.b_bool;
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p_dec->pf_decode_video = DecodeBlock;
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msg_Dbg( p_dec, "cinepak decoder started" );
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return VLC_SUCCESS;
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}
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/****************************************************************************
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* DecodeBlock: the whole thing
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****************************************************************************
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* This function must be fed with whole frames.
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****************************************************************************/
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static picture_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
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{
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decoder_sys_t *p_sys = p_dec->p_sys;
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int i_status, i_plane;
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uint8_t *p_dst, *p_src;
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picture_t *p_pic;
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block_t *p_block;
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if( !pp_block || !*pp_block )
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{
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return NULL;
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}
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p_block = *pp_block;
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*pp_block = NULL;
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i_status = cinepak_decode_frame( &p_sys->context, p_block->i_buffer,
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p_block->p_buffer );
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if( i_status < 0 )
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{
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msg_Warn( p_dec, "cannot decode one frame (%d bytes)",
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p_block->i_buffer );
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block_Release( p_block );
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return NULL;
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}
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p_dec->fmt_out.video.i_width = p_sys->context.i_width;
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p_dec->fmt_out.video.i_height = p_sys->context.i_height;
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p_dec->fmt_out.video.i_aspect = p_sys->context.i_width
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* VOUT_ASPECT_FACTOR / p_sys->context.i_height;
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p_dec->fmt_out.i_codec = VLC_FOURCC('I','4','2','0');
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/* Get a new picture */
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if( ( p_pic = p_dec->pf_vout_buffer_new( p_dec ) ) )
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{
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for( i_plane = 0; i_plane < 3; i_plane++ )
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{
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int i_line, i_lines;
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p_dst = p_pic->p[i_plane].p_pixels;
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p_src = p_sys->context.p_pix[i_plane];
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i_lines = __MIN( p_sys->context.i_lines[i_plane],
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p_pic->p[i_plane].i_visible_lines );
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for( i_line = 0; i_line < i_lines; i_line++ )
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{
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memcpy( p_dst, p_src,
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__MIN( p_pic->p[i_plane].i_pitch,
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p_sys->context.i_stride[i_plane] ) );
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p_dst += p_pic->p[i_plane].i_pitch;
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p_src += p_sys->context.i_stride[i_plane];
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}
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}
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p_pic->date = p_block->i_pts ? p_block->i_pts : p_block->i_dts;
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}
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block_Release( p_block );
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return p_pic;
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}
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/*****************************************************************************
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* CloseDecoder: decoder destruction
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*****************************************************************************/
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static void CloseDecoder( 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 = p_dec->p_sys;
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int i;
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msg_Dbg( p_dec, "cinepak decoder stopped" );
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for( i = 0; i < 3; i++ )
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{
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if( p_sys->context.p_pix[i] ) free( p_sys->context.p_pix[i] );
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}
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free( p_sys );
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}
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/*****************************************************************************
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* local Functions
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*****************************************************************************/
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#define GET2BYTES( p ) \
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GetWBE( p ); p+= 2;
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/* FIXME */
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#define GET3BYTES( p ) \
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(GetDWBE( p ) >> 8); p+= 3;
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#define GET4BYTES( p ) \
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GetDWBE( p ); p+= 4;
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#define FREE( p ) \
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if( p ) free( p )
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static void cinepak_LoadCodebook( cinepak_codebook_t *p_codebook,
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uint8_t *p_data, int b_grayscale )
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{
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int i, i_y[4], i_u, i_v, i_Cb, i_Cr;
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int i_uv;
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#define SCALEBITS 12
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#define FIX( x ) ( (int)( (x) * ( 1L << SCALEBITS ) + 0.5 ) )
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for( i = 0; i < 4; i++ )
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{
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i_y[i] = (uint8_t)( *(p_data++) );
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}
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if( b_grayscale )
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{
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i_u = (int8_t)( *(p_data++) );
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i_v = (int8_t)( *(p_data++) );
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}
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else
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{
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i_u = 0;
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i_v = 0;
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}
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/*
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| Y | | 1 -0.0655 0.0110 | | CY |
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| Cb | = | 0 1.1656 -0.0062 | | CU |
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| Cr | | 0 0.0467 1.4187 | | CV |
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*/
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i_uv = ( FIX( -0.0655 ) * i_u + FIX( 0.0110 ) * i_v ) >> SCALEBITS;
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for( i = 0; i < 4; i++ )
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{
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i_y[i] += i_uv;
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}
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i_Cb = ( FIX( 1.1656 ) * i_u + FIX( -0.0062 ) * i_v ) >> SCALEBITS;
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i_Cr = ( FIX( 0.0467 ) * i_u + FIX( 1.4187 ) * i_v ) >> SCALEBITS;
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for( i = 0; i < 4; i++ )
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{
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p_codebook->i_y[i] = __MIN( __MAX( 0, i_y[i] ), 255 );
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}
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p_codebook->i_u = __MIN( __MAX( 0, i_Cb + 128 ), 255 );
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p_codebook->i_v = __MIN( __MAX( 0, i_Cr + 128 ), 255 );
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#undef FIX
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#undef SCALEBITS
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}
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static void cinepak_Getv4( cinepak_context_t *p_context,
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int i_strip, int i_x, int i_y,
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int i_x2, int i_y2, uint8_t *p_data )
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{
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uint8_t i_index[4];
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int i,j;
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uint8_t *p_dst_y, *p_dst_u, *p_dst_v;
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#define PIX_SET_Y( x, y, v ) \
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p_dst_y[(x) + (y)* p_context->i_stride[0]] = (v);
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#define PIX_SET_UV( i, p, x, y, v ) \
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p[(x) + (y)* (p_context->i_stride[i])] = (v);
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for( i = 0; i < 4; i++ )
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{
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i_index[i] = *(p_data++);
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}
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/* y plane */
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p_dst_y = p_context->p_pix[0] + p_context->i_stride[0] * i_y + i_x;
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p_dst_u = p_context->p_pix[1] + p_context->i_stride[1] * (i_y/2) + (i_x/2);
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p_dst_v = p_context->p_pix[2] + p_context->i_stride[2] * (i_y/2) + (i_x/2);
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for( i = 0; i < 2; i++ )
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{
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for( j = 0; j < 2; j ++ )
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{
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PIX_SET_Y( 2*j + 0, 2*i + 0,
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p_context->codebook_v4[i_strip][i_index[j+2*i]].i_y[0]);
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PIX_SET_Y( 2*j + 1, 2*i + 0,
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p_context->codebook_v4[i_strip][i_index[j+2*i]].i_y[1]);
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PIX_SET_Y( 2*j + 0, 2*i + 1,
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p_context->codebook_v4[i_strip][i_index[j+2*i]].i_y[2]);
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PIX_SET_Y( 2*j + 1, 2*i + 1,
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p_context->codebook_v4[i_strip][i_index[j+2*i]].i_y[3]);
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PIX_SET_UV( 1, p_dst_u, j, i,
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p_context->codebook_v4[i_strip][i_index[j+2*i]].i_u );
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PIX_SET_UV( 2, p_dst_v, j, i,
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p_context->codebook_v4[i_strip][i_index[j+2*i]].i_v );
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}
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}
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#undef PIX_SET_Y
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#undef PIX_SET_UV
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}
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static void cinepak_Getv1( cinepak_context_t *p_context,
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int i_strip, int i_x, int i_y,
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int i_x2, int i_y2, uint8_t *p_data )
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{
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uint8_t i_index;
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int i,j;
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uint8_t *p_dst_y, *p_dst_u, *p_dst_v;
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#define PIX_SET_Y( x, y, v ) \
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p_dst_y[(x) + (y)* p_context->i_stride[0]] = (v);
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#define PIX_SET_UV( i,p, x, y, v ) \
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p[(x) + (y)* (p_context->i_stride[i])] = (v);
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i_index = *(p_data++);
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/* y plane */
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p_dst_y = p_context->p_pix[0] + p_context->i_stride[0] * i_y + i_x;
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p_dst_u = p_context->p_pix[1] + p_context->i_stride[1] * (i_y/2) + (i_x/2);
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p_dst_v = p_context->p_pix[2] + p_context->i_stride[2] * (i_y/2) + (i_x/2);
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for( i = 0; i < 2; i++ )
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{
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for( j = 0; j < 2; j ++ )
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{
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PIX_SET_Y( 2*j + 0, 2*i + 0,
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p_context->codebook_v1[i_strip][i_index].i_y[2*i+j] );
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PIX_SET_Y( 2*j + 1, 2*i + 0,
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p_context->codebook_v1[i_strip][i_index].i_y[2*i+j] );
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PIX_SET_Y( 2*j + 0, 2*i + 1,
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p_context->codebook_v1[i_strip][i_index].i_y[2*i+j] );
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PIX_SET_Y( 2*j + 1, 2*i + 1,
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p_context->codebook_v1[i_strip][i_index].i_y[2*i+j] );
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PIX_SET_UV( 1,p_dst_u, j, i,
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p_context->codebook_v1[i_strip][i_index].i_u );
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PIX_SET_UV( 2,p_dst_v, j, i,
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p_context->codebook_v1[i_strip][i_index].i_v );
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}
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}
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#undef PIX_SET_Y
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#undef PIX_SET_UV
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}
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/*****************************************************************************
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* The function that decode one frame
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*****************************************************************************/
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static int cinepak_decode_frame( cinepak_context_t *p_context,
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int i_length, uint8_t *p_data )
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{
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int i_strip;
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int i_frame_flags;
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int i_frame_size;
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int i_width, i_height;
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int i_frame_strips;
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int i_index;
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int i_strip_x1 =0, i_strip_y1=0;
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int i_strip_x2 =0, i_strip_y2=0;
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if( i_length <= 10 )
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{
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/* Broken header or no data */
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return( -1 );
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}
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/* get header */
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i_frame_flags = *(p_data++);
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i_frame_size = GET3BYTES( p_data );
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i_width = GET2BYTES( p_data );
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i_height = GET2BYTES( p_data );
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i_frame_strips = GET2BYTES( p_data );
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if( !i_frame_size || !i_width || !i_height )
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{
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/* Broken header */
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return( -1 );
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}
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/* Check if we have a picture buffer with good size */
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if( ( p_context->i_width != i_width ) ||
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( p_context->i_height != i_height ) )
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{
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int i;
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for( i = 0; i < 3; i++ )
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{
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FREE( p_context->p_pix[i] );
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}
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p_context->i_width = i_width;
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p_context->i_height = i_height;
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p_context->i_stride[0] = ( i_width + 3 ) & 0xfffc;
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p_context->i_stride[1] = p_context->i_stride[2] =
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p_context->i_stride[0] / 2;
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p_context->i_lines[0] = ( i_height + 3 ) & 0xfffc;
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p_context->i_lines[1] = p_context->i_lines[2] =
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p_context->i_lines[0] /2;
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for( i = 0; i < 3; i++ )
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{
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p_context->p_pix[i] = malloc( p_context->i_stride[i] *
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p_context->i_lines[i] );
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/* Set it to all black */
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memset( p_context->p_pix[i], ( i == 0 ) ? 0 : 128 ,
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p_context->i_stride[i] * p_context->i_lines[i] );
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}
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}
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if( i_frame_size != i_length )
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{
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i_length = __MIN( i_length, i_frame_size );
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}
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i_length -= 10;
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if( i_frame_strips >= CINEPAK_MAXSTRIP )
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{
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i_frame_strips = CINEPAK_MAXSTRIP;
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}
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/* Now decode each strip */
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for( i_strip = 0; i_strip < i_frame_strips; i_strip++ )
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{
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int i_strip_id;
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int i_strip_size;
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if( i_length <= 12 )
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{
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break;
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}
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i_strip_id = GET2BYTES( p_data );
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i_strip_size = GET2BYTES( p_data );
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i_strip_size = __MIN( i_strip_size, i_length );
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/* FIXME I don't really understand how it's work; */
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i_strip_y1 = i_strip_y2 + GET2BYTES( p_data );
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i_strip_x1 = GET2BYTES( p_data );
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i_strip_y2 = i_strip_y2 + GET2BYTES( p_data );
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i_strip_x2 = GET2BYTES( p_data );
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i_length -= i_strip_size;
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i_strip_size -= 12;
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/* init codebook , if needed */
|
|
if( ( i_strip > 0 )&&( !(i_frame_flags&0x01) ) )
|
|
{
|
|
memcpy( &p_context->codebook_v1[i_strip],
|
|
&p_context->codebook_v1[i_strip-1],
|
|
sizeof(cinepak_codebook_t[256] ) );
|
|
|
|
memcpy( &p_context->codebook_v4[i_strip],
|
|
&p_context->codebook_v4[i_strip-1],
|
|
sizeof(cinepak_codebook_t[256] ) );
|
|
}
|
|
|
|
/* Now parse all chunk in this strip */
|
|
while( i_strip_size > 0 )
|
|
{
|
|
cinepak_codebook_t (*p_codebook)[CINEPAK_MAXSTRIP][256];
|
|
int i_mode;
|
|
|
|
int i_chunk_id;
|
|
int i_chunk_size;
|
|
uint32_t i_vector_flags;
|
|
int i_count;
|
|
int i;
|
|
int i_x, i_y; /* (0,0) begin in fact at (x1,y1) ... */
|
|
|
|
i_chunk_id = GET2BYTES( p_data );
|
|
i_chunk_size = GET2BYTES( p_data );
|
|
i_chunk_size = __MIN( i_chunk_size, i_strip_size );
|
|
i_strip_size -= i_chunk_size;
|
|
|
|
i_chunk_size -= 4;
|
|
|
|
i_x = 0;
|
|
i_y = 0;
|
|
if( i_chunk_size < 0 )
|
|
{
|
|
break;
|
|
}
|
|
|
|
switch( i_chunk_id )
|
|
{
|
|
case( 0x2000 ): /* 12bits v4 Intra*/
|
|
case( 0x2200 ): /* 12bits v1 Intra*/
|
|
case( 0x2400 ): /* 8bits v4 Intra*/
|
|
case( 0x2600 ): /* 8bits v1 Intra */
|
|
i_mode = ( ( i_chunk_id&0x0400 ) == 0 );
|
|
p_codebook = ( i_chunk_id&0x0200 ) ?
|
|
&p_context->codebook_v1 :
|
|
&p_context->codebook_v4;
|
|
|
|
i_count = __MIN( i_chunk_size / ( i_mode ? 6 : 4 ), 256 );
|
|
|
|
for( i = 0; i < i_count; i++ )
|
|
{
|
|
cinepak_LoadCodebook( &((*p_codebook)[i_strip][i]),
|
|
p_data,
|
|
i_mode&~p_context->b_grayscale );
|
|
p_data += i_mode ? 6 : 4;
|
|
i_chunk_size -= i_mode ? 6 : 4;
|
|
}
|
|
break;
|
|
|
|
case( 0x2100 ): /* selective 12bits v4 Inter*/
|
|
case( 0x2300 ): /* selective 12bits v1 Inter*/
|
|
case( 0x2500 ): /* selective 8bits v4 Inter*/
|
|
case( 0x2700 ): /* selective 8bits v1 Inter*/
|
|
i_mode = ( ( i_chunk_id&0x0400 ) == 0 );
|
|
p_codebook = ( i_chunk_id&0x0200 ) ?
|
|
&p_context->codebook_v1 :
|
|
&p_context->codebook_v4;
|
|
|
|
i_index = 0;
|
|
while( (i_chunk_size > 4)&&(i_index<256))
|
|
{
|
|
i_vector_flags = GET4BYTES( p_data );
|
|
i_chunk_size -= 4;
|
|
for( i = 0; i < 32; i++ )
|
|
{
|
|
if( ( i_chunk_size < ( i_mode ? 6 : 4 ) )
|
|
|| (i_index >= 256 ) )
|
|
{
|
|
break;
|
|
}
|
|
if( i_vector_flags&0x80000000UL )
|
|
{
|
|
cinepak_LoadCodebook(
|
|
&((*p_codebook)[i_strip][i_index]),
|
|
p_data, i_mode&~p_context->b_grayscale );
|
|
|
|
p_data += i_mode ? 6 : 4;
|
|
i_chunk_size -= i_mode ? 6 : 4;
|
|
}
|
|
i_index++;
|
|
i_vector_flags <<= 1;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case( 0x3000 ): /* load image Intra */
|
|
while( (i_chunk_size >= 4 )&&(i_y<i_strip_y2-i_strip_y1) )
|
|
{
|
|
i_vector_flags = GET4BYTES( p_data );
|
|
i_chunk_size -= 4;
|
|
i_strip_size -= 4;
|
|
i_length -= 4;
|
|
|
|
for( i = 0; i < 32; i++ )
|
|
{
|
|
if( ( i_y >= i_strip_y2 - i_strip_y1) ||
|
|
( i_chunk_size<=0 ) )
|
|
{
|
|
break;
|
|
}
|
|
if( i_vector_flags&0x80000000UL )
|
|
{
|
|
cinepak_Getv4( p_context,
|
|
i_strip,
|
|
i_strip_x1 + i_x,
|
|
i_strip_y1 + i_y,
|
|
i_strip_x2, i_strip_y2,
|
|
p_data );
|
|
p_data += 4;
|
|
i_chunk_size -= 4;
|
|
}
|
|
else
|
|
{
|
|
cinepak_Getv1( p_context,
|
|
i_strip,
|
|
i_strip_x1 + i_x,
|
|
i_strip_y1 + i_y,
|
|
i_strip_x2, i_strip_y2,
|
|
p_data );
|
|
p_data++;
|
|
i_chunk_size--;
|
|
}
|
|
|
|
i_x += 4;
|
|
if( i_x >= i_strip_x2 - i_strip_x1 )
|
|
{
|
|
i_x = 0;
|
|
i_y += 4;
|
|
}
|
|
i_vector_flags <<= 1;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case( 0x3100 ): /* load image Inter */
|
|
while( ( i_chunk_size > 4 )&&( i_y < i_strip_y2 - i_strip_y1) )
|
|
{
|
|
uint32_t i_mask;
|
|
i_vector_flags = GET4BYTES( p_data );
|
|
i_chunk_size -= 4;
|
|
i_mask = 0x80000000UL;
|
|
|
|
while( (i_chunk_size > 0 ) && ( i_mask )
|
|
&& ( i_y < i_strip_y2 - i_strip_y1 ) )
|
|
{
|
|
if( i_vector_flags&i_mask )
|
|
{
|
|
i_mask >>= 1;
|
|
if( !i_mask )
|
|
{
|
|
if( i_chunk_size < 4 )
|
|
{
|
|
break;
|
|
}
|
|
i_vector_flags = GET4BYTES( p_data );
|
|
i_chunk_size -= 4;
|
|
i_mask = 0x80000000UL;
|
|
}
|
|
if( i_vector_flags&i_mask )
|
|
{
|
|
if( i_chunk_size < 4 ) break;
|
|
cinepak_Getv4( p_context,
|
|
i_strip,
|
|
i_strip_x1 + i_x,
|
|
i_strip_y1 + i_y,
|
|
i_strip_x2, i_strip_y2,
|
|
p_data );
|
|
p_data += 4;
|
|
i_chunk_size -= 4;
|
|
}
|
|
else
|
|
{
|
|
if( i_chunk_size < 1 ) break;
|
|
cinepak_Getv1( p_context,
|
|
i_strip,
|
|
i_strip_x1 + i_x,
|
|
i_strip_y1 + i_y,
|
|
i_strip_x2, i_strip_y2,
|
|
p_data );
|
|
p_data++;
|
|
i_chunk_size--;
|
|
}
|
|
}
|
|
i_mask >>= 1;
|
|
|
|
i_x += 4;
|
|
if( i_x >= i_strip_x2 - i_strip_x1 )
|
|
{
|
|
i_x = 0;
|
|
i_y += 4;
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
|
|
case( 0x3200 ): /* load intra picture but all v1*/
|
|
while( ( i_chunk_size > 0 ) &&
|
|
( i_y < i_strip_y2 - i_strip_y1 ) )
|
|
{
|
|
cinepak_Getv1( p_context,
|
|
i_strip,
|
|
i_strip_x1 + i_x,
|
|
i_strip_y1 + i_y,
|
|
i_strip_x2, i_strip_y2,
|
|
p_data );
|
|
p_data++;
|
|
i_chunk_size--;
|
|
|
|
i_x += 4;
|
|
if( i_x >= i_strip_x2 - i_strip_x1 )
|
|
{
|
|
i_x = 0;
|
|
i_y += 4;
|
|
}
|
|
}
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
|
|
}
|
|
p_data += i_chunk_size ; /* skip remains bytes */
|
|
}
|
|
}
|
|
|
|
return( 0 );
|
|
}
|
|
|