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* XVID MPEG-4 VIDEO CODEC |
* XVID MPEG-4 VIDEO CODEC |
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* - Decoder Module - |
* - Decoder Module - |
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* |
* |
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* This file is part of XviD, a free MPEG-4 video encoder/decoder |
* Copyright(C) 2002 MinChen <chenm001@163.com> |
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* 2002-2003 Peter Ross <pross@xvid.org> |
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* |
* |
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* This program is free software; you can redistribute it and/or modify |
* 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 |
* it under the terms of the GNU General Public License as published by |
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#include "utils/timer.h" |
#include "utils/timer.h" |
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#include "utils/emms.h" |
#include "utils/emms.h" |
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#include "motion/motion.h" |
#include "motion/motion.h" |
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#include "motion/gmc.h" |
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#include "image/image.h" |
#include "image/image.h" |
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#include "image/colorspace.h" |
#include "image/colorspace.h" |
584 |
stop_transfer_timer(); |
stop_transfer_timer(); |
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} |
} |
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static __inline int gmc_sanitize(int value, int quarterpel, int fcode) |
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{ |
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int length = 1 << (fcode+4); |
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/* if (quarterpel) value *= 2; */ |
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if (value < -length) |
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return -length; |
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else if (value >= length) |
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return length-1; |
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else return value; |
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} |
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static void |
static void |
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decoder_mbgmc(DECODER * dec, |
decoder_mbgmc(DECODER * dec, |
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/* this is where the calculations are done */ |
/* this is where the calculations are done */ |
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{ |
{ NEW_GMC_DATA * gmc_data = &dec->new_gmc_data; |
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pMB->amv = generate_GMCimageMB(&dec->gmc_data, &dec->refn[0], x_pos, y_pos, |
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stride, stride2, dec->quarterpel, rounding, &dec->cur); |
gmc_data->predict_16x16(gmc_data, |
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dec->cur.y + y_pos*16*stride + x_pos*16, dec->refn[0].y, |
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stride, stride, x_pos, y_pos, rounding); |
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gmc_data->predict_8x8(gmc_data, |
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dec->cur.u + y_pos*8*stride2 + x_pos*8, dec->refn[0].u, |
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dec->cur.v + y_pos*8*stride2 + x_pos*8, dec->refn[0].v, |
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stride2, stride2, x_pos, y_pos, rounding); |
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630 |
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gmc_data->get_average_mv(gmc_data, &pMB->amv, x_pos, y_pos, dec->quarterpel); |
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pMB->amv.x = gmc_sanitize(pMB->amv.x, dec->quarterpel, fcode); |
pMB->amv.x = gmc_sanitize(pMB->amv.x, dec->quarterpel, fcode); |
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pMB->amv.y = gmc_sanitize(pMB->amv.y, dec->quarterpel, fcode); |
pMB->amv.y = gmc_sanitize(pMB->amv.y, dec->quarterpel, fcode); |
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{ |
{ |
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/* accuracy: 0==1/2, 1=1/4, 2=1/8, 3=1/16 */ |
/* accuracy: 0==1/2, 1=1/4, 2=1/8, 3=1/16 */ |
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if ( (dec->sprite_warping_accuracy != 3) || (dec->sprite_warping_points != 2) ) |
/* { |
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{ |
fprintf(stderr,"GMC parameters acc=%d(-> 1/%d), %d pts!!!\n", |
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fprintf(stderr,"Wrong GMC parameters acc=%d(-> 1/%d), %d!!!\n", |
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dec->sprite_warping_accuracy,(2<<dec->sprite_warping_accuracy), |
dec->sprite_warping_accuracy,(2<<dec->sprite_warping_accuracy), |
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dec->sprite_warping_points); |
dec->sprite_warping_points); |
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} |
}*/ |
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generate_GMCparameters( dec->sprite_warping_points, |
generate_GMCparameters( dec->sprite_warping_points, |
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(2 << dec->sprite_warping_accuracy), gmc_warp, |
dec->sprite_warping_accuracy, gmc_warp, |
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dec->width, dec->height, &dec->gmc_data); |
dec->width, dec->height, &dec->new_gmc_data); |
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/* image warping is done block-based in decoder_mbgmc(), now */ |
/* image warping is done block-based in decoder_mbgmc(), now */ |
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/* |
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generate_GMCimage(&dec->gmc_data, &dec->refn[0], |
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mb_width, mb_height, |
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dec->edged_width, dec->edged_width/2, |
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fcode, dec->quarterpel, 0, |
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rounding, dec->mbs, &dec->gmc); |
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*/ |
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} |
} |
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bound = 0; |
bound = 0; |
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{ |
{ |
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stats->type = coding2type(coding_type); |
stats->type = coding2type(coding_type); |
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stats->data.vop.time_base = (int)dec->time_base; |
stats->data.vop.time_base = (int)dec->time_base; |
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stats->data.vop.time_increment = 0; //XXX: todo |
stats->data.vop.time_increment = 0; /* XXX: todo */ |
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} |
} |
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} |
} |
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WARPPOINTS gmc_warp; |
WARPPOINTS gmc_warp; |
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int coding_type; |
int coding_type; |
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int success, output, seen_something; |
int success, output, seen_something; |
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idctFuncPtr idct_save; |
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if (XVID_MAJOR(frame->version) != 1 || (stats && XVID_MAJOR(stats->version) != 1)) /* v1.x.x */ |
if (XVID_MAJOR(frame->version) != 1 || (stats && XVID_MAJOR(stats->version) != 1)) /* v1.x.x */ |
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return XVID_ERR_VERSION; |
return XVID_ERR_VERSION; |
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success = 0; |
success = 0; |
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output = 0; |
output = 0; |
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seen_something = 0; |
seen_something = 0; |
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idct_save = idct; |
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repeat: |
repeat: |
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dec->p_bmv.x = dec->p_bmv.y = dec->p_fmv.y = dec->p_fmv.y = 0; /* init pred vector to 0 */ |
dec->p_bmv.x = dec->p_bmv.y = dec->p_fmv.y = dec->p_fmv.y = 0; /* init pred vector to 0 */ |
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#if defined(ARCH_IS_IA32) |
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/* |
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* /!\ Ugly hack /!\ |
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* IA32: Prior to xvid bitstream 10, we were using Walten's mmx/xmm idct |
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*/ |
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if((idct == simple_idct_mmx) && (dec->bs_version < 10)) |
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idct = idct_mmx; |
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#endif |
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/* packed_mode: special-N_VOP treament */ |
/* packed_mode: special-N_VOP treament */ |
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if (dec->packed_mode && coding_type == N_VOP) |
if (dec->packed_mode && coding_type == N_VOP) |
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fcode_forward, intra_dc_threshold, &gmc_warp); |
fcode_forward, intra_dc_threshold, &gmc_warp); |
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break; |
break; |
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case N_VOP : |
case N_VOP : |
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// XXX: not_coded vops are not used for forward prediction |
/* XXX: not_coded vops are not used for forward prediction */ |
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// we should not swap(last_mbs,mbs) |
/* we should not swap(last_mbs,mbs) */ |
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image_copy(&dec->cur, &dec->refn[0], dec->edged_width, dec->height); |
image_copy(&dec->cur, &dec->refn[0], dec->edged_width, dec->height); |
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break; |
break; |
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} |
} |
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emms(); |
emms(); |
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stop_global_timer(); |
stop_global_timer(); |
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idct = idct_save; |
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return BitstreamPos(&bs) / 8; /* number of bytes consumed */ |
return BitstreamPos(&bs) / 8; /* number of bytes consumed */ |
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} |
} |