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/************************************************************************** |
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* |
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* XVID MPEG-4 VIDEO CODEC |
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* decoder main |
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* |
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* This program is an implementation of a part of one or more MPEG-4 |
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* Video tools as specified in ISO/IEC 14496-2 standard. Those intending |
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* to use this software module in hardware or software products are |
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* advised that its use may infringe existing patents or copyrights, and |
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* any such use would be at such party's own risk. The original |
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* developer of this software module and his/her company, and subsequent |
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* editors and their companies, will have no liability for use of this |
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* software or modifications or derivatives thereof. |
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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., 675 Mass Ave, Cambridge, MA 02139, USA. |
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* |
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*************************************************************************/ |
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|
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/************************************************************************** |
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* |
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* History: |
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* |
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* 26.12.2001 decoder_mbinter: dequant/idct moved within if(coded) block |
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* 22.12.2001 block based interpolation |
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* 01.12.2001 inital version; (c)2001 peter ross <pross@cs.rmit.edu.au> |
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* |
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*************************************************************************/ |
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|
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#include <stdlib.h> |
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#include <string.h> // memset |
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|
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#include "xvid.h" |
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#include "portab.h" |
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|
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#include "decoder.h" |
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#include "bitstream/bitstream.h" |
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#include "bitstream/mbcoding.h" |
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|
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#include "quant/quant_h263.h" |
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#include "quant/quant_mpeg4.h" |
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#include "dct/idct.h" |
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#include "dct/fdct.h" |
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#include "utils/mem_transfer.h" |
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#include "image/interpolate8x8.h" |
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|
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#include "bitstream/mbcoding.h" |
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#include "prediction/mbprediction.h" |
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#include "utils/timer.h" |
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#include "utils/emms.h" |
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|
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#include "image/image.h" |
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#include "image/colorspace.h" |
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|
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int decoder_create(XVID_DEC_PARAM * param) |
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{ |
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DECODER * dec; |
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|
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dec = malloc(sizeof(DECODER)); |
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if (dec == NULL) |
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{ |
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return XVID_ERR_MEMORY; |
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} |
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param->handle = dec; |
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|
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dec->width = param->width; |
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dec->height = param->height; |
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|
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dec->mb_width = (dec->width + 15) / 16; |
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dec->mb_height = (dec->height + 15) / 16; |
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|
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dec->edged_width = 16 * dec->mb_width + 2 * EDGE_SIZE; |
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dec->edged_height = 16 * dec->mb_height + 2 * EDGE_SIZE; |
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|
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if (image_create(&dec->cur, dec->edged_width, dec->edged_height)) |
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{ |
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free(dec); |
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return XVID_ERR_MEMORY; |
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} |
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|
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if (image_create(&dec->refn, dec->edged_width, dec->edged_height)) |
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{ |
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image_destroy(&dec->cur, dec->edged_width, dec->edged_height); |
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free(dec); |
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return XVID_ERR_MEMORY; |
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} |
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|
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dec->mbs = malloc(sizeof(MACROBLOCK) * dec->mb_width * dec->mb_height); |
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if (dec->mbs == NULL) |
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{ |
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image_destroy(&dec->cur, dec->edged_width, dec->edged_height); |
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free(dec); |
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return XVID_ERR_MEMORY; |
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} |
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|
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init_timer(); |
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create_vlc_tables(); |
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|
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return XVID_ERR_OK; |
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} |
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|
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|
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int decoder_destroy(DECODER * dec) |
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{ |
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free(dec->mbs); |
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image_destroy(&dec->refn, dec->edged_width, dec->edged_height); |
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image_destroy(&dec->cur, dec->edged_width, dec->edged_height); |
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free(dec); |
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|
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destroy_vlc_tables(); |
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|
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write_timer(); |
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return XVID_ERR_OK; |
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} |
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|
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|
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|
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static const int32_t dquant_table[4] = |
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{ |
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-1, -2, 1, 2 |
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}; |
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|
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|
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// decode an intra macroblock |
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|
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void decoder_mbintra(DECODER * dec, MACROBLOCK * mb, int x, int y, uint32_t acpred_flag, uint32_t cbp, Bitstream * bs, int quant, int intra_dc_threshold) |
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{ |
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uint32_t k; |
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|
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for (k = 0; k < 6; k++) |
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{ |
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uint32_t dcscalar; |
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int16_t block[64]; |
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int16_t data[64]; |
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int16_t predictors[8]; |
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int start_coeff; |
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|
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dcscalar = get_dc_scaler(mb->quant, k < 4); |
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|
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start_timer(); |
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predict_acdc(dec->mbs, x, y, dec->mb_width, k, block, mb->quant, dcscalar, predictors); |
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if (!acpred_flag) |
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{ |
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mb->acpred_directions[k] = 0; |
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} |
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stop_prediction_timer(); |
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|
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memset(block, 0, 64*sizeof(int16_t)); // clear |
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|
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if (quant < intra_dc_threshold) |
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{ |
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int dc_size; |
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int dc_dif; |
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|
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dc_size = k < 4 ? get_dc_size_lum(bs) : get_dc_size_chrom(bs); |
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dc_dif = dc_size ? get_dc_dif(bs, dc_size) : 0 ; |
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|
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if (dc_size > 8) |
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{ |
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BitstreamSkip(bs, 1); // marker |
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} |
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|
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block[0] = dc_dif; |
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start_coeff = 1; |
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} |
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else |
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{ |
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start_coeff = 0; |
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} |
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|
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start_timer(); |
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if (cbp & (1 << (5-k))) // coded |
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{ |
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get_intra_block(bs, block, mb->acpred_directions[k], start_coeff); |
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} |
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stop_coding_timer(); |
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|
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start_timer(); |
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add_acdc(mb, k, block, dcscalar, predictors); |
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stop_prediction_timer(); |
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|
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start_timer(); |
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if (dec->quant_type == 0) |
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{ |
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dequant_intra(data, block, mb->quant, dcscalar); |
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} |
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else |
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{ |
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dequant4_intra(data, block, mb->quant, dcscalar); |
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} |
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stop_iquant_timer(); |
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|
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start_timer(); |
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idct(data); |
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stop_idct_timer(); |
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|
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start_timer(); |
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if (k < 4) |
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{ |
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transfer_16to8copy(dec->cur.y + (16*y*dec->edged_width) + 16*x + (4*(k&2)*dec->edged_width) + 8*(k&1), data, dec->edged_width); |
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} |
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else if (k == 4) |
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{ |
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transfer_16to8copy(dec->cur.u+ 8*y*(dec->edged_width/2) + 8*x, data, (dec->edged_width/2)); |
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} |
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else // if (k == 5) |
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{ |
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transfer_16to8copy(dec->cur.v + 8*y*(dec->edged_width/2) + 8*x, data, (dec->edged_width/2)); |
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} |
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stop_transfer_timer(); |
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} |
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} |
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|
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|
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|
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|
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|
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#define SIGN(X) (((X)>0)?1:-1) |
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#define ABS(X) (((X)>0)?(X):-(X)) |
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static const uint32_t roundtab[16] = |
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{ 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2 }; |
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|
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|
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// decode an inter macroblock |
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|
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void decoder_mbinter(DECODER * dec, MACROBLOCK * mb, int x, int y, uint32_t acpred_flag, uint32_t cbp, Bitstream * bs, int quant, int rounding) |
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{ |
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const uint32_t stride = dec->edged_width; |
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const uint32_t stride2 = dec->edged_width / 2; |
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int uv_dx, uv_dy; |
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uint32_t k; |
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|
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if (mb->mode == MODE_INTER || mb->mode == MODE_INTER_Q) |
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{ |
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uv_dx = mb->mvs[0].x; |
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uv_dy = mb->mvs[0].y; |
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|
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uv_dx = (uv_dx & 3) ? (uv_dx >> 1) | 1 : uv_dx / 2; |
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uv_dy = (uv_dy & 3) ? (uv_dy >> 1) | 1 : uv_dy / 2; |
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} |
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else |
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{ |
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int sum; |
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sum = mb->mvs[0].x + mb->mvs[1].x + mb->mvs[2].x + mb->mvs[3].x; |
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uv_dx = (sum == 0 ? 0 : SIGN(sum) * (roundtab[ABS(sum) % 16] + (ABS(sum) / 16) * 2) ); |
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|
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sum = mb->mvs[0].y + mb->mvs[1].y + mb->mvs[2].y + mb->mvs[3].y; |
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uv_dy = (sum == 0 ? 0 : SIGN(sum) * (roundtab[ABS(sum) % 16] + (ABS(sum) / 16) * 2) ); |
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} |
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|
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start_timer(); |
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interpolate8x8_switch(dec->cur.y, dec->refn.y, 16*x, 16*y , mb->mvs[0].x, mb->mvs[0].y, stride, rounding); |
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interpolate8x8_switch(dec->cur.y, dec->refn.y, 16*x + 8, 16*y , mb->mvs[1].x, mb->mvs[1].y, stride, rounding); |
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interpolate8x8_switch(dec->cur.y, dec->refn.y, 16*x, 16*y + 8, mb->mvs[2].x, mb->mvs[2].y, stride, rounding); |
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interpolate8x8_switch(dec->cur.y, dec->refn.y, 16*x + 8, 16*y + 8, mb->mvs[3].x, mb->mvs[3].y, stride, rounding); |
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interpolate8x8_switch(dec->cur.u, dec->refn.u, 8*x, 8*y, uv_dx, uv_dy, stride2, rounding); |
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interpolate8x8_switch(dec->cur.v, dec->refn.v, 8*x, 8*y, uv_dx, uv_dy, stride2, rounding); |
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stop_comp_timer(); |
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|
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|
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for (k = 0; k < 6; k++) |
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{ |
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int16_t block[64]; |
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int16_t data[64]; |
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|
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if (cbp & (1 << (5-k))) // coded |
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{ |
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memset(block, 0, 64 * sizeof(int16_t)); // clear |
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|
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start_timer(); |
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get_inter_block(bs, block); |
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stop_coding_timer(); |
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|
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start_timer(); |
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if (dec->quant_type == 0) |
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{ |
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dequant_inter(data, block, mb->quant); |
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} |
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else |
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{ |
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dequant4_inter(data, block, mb->quant); |
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} |
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stop_iquant_timer(); |
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|
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start_timer(); |
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idct(data); |
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stop_idct_timer(); |
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|
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start_timer(); |
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if (k < 4) |
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{ |
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transfer_16to8add(dec->cur.y + (16*y + 4*(k&2))*stride + 16*x + 8*(k&1), data, stride); |
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} |
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else if (k == 4) |
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{ |
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transfer_16to8add(dec->cur.u + 8*y*stride2 + 8*x, data, stride2); |
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} |
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else // k == 5 |
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{ |
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transfer_16to8add(dec->cur.v + 8*y*stride2 + 8*x, data, stride2); |
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} |
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stop_transfer_timer(); |
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} |
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} |
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} |
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|
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|
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|
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void decoder_iframe(DECODER * dec, Bitstream * bs, int quant, int intra_dc_threshold) |
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{ |
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uint32_t x, y; |
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|
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for (y = 0; y < dec->mb_height; y++) |
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{ |
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for (x = 0; x < dec->mb_width; x++) |
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{ |
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MACROBLOCK * mb = &dec->mbs[y*dec->mb_width + x]; |
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|
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uint32_t mcbpc; |
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uint32_t cbpc; |
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uint32_t acpred_flag; |
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uint32_t cbpy; |
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uint32_t cbp; |
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|
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mcbpc = get_mcbpc_intra(bs); |
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mb->mode = mcbpc & 7; |
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cbpc = (mcbpc >> 4); |
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|
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acpred_flag = BitstreamGetBit(bs); |
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|
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if (mb->mode == MODE_STUFFING) |
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{ |
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DEBUG("-- STUFFING ?"); |
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continue; |
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} |
| 347 |
|
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cbpy = get_cbpy(bs, 1); |
| 349 |
cbp = (cbpy << 2) | cbpc; |
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|
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if (mb->mode == MODE_INTRA_Q) |
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{ |
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quant += dquant_table[BitstreamGetBits(bs,2)]; |
| 354 |
if (quant > 31) |
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{ |
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quant = 31; |
| 357 |
} |
| 358 |
else if (quant < 1) |
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{ |
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quant = 1; |
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} |
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} |
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mb->quant = quant; |
| 364 |
|
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|
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decoder_mbintra(dec, mb, x, y, acpred_flag, cbp, bs, quant, intra_dc_threshold); |
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} |
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} |
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} |
| 370 |
|
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|
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void get_motion_vector(DECODER *dec, Bitstream *bs, int x, int y, int k, VECTOR * mv, int fcode) |
| 373 |
{ |
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int scale_fac = 1 << (fcode - 1); |
| 375 |
int high = (32 * scale_fac) - 1; |
| 376 |
int low = ((-32) * scale_fac); |
| 377 |
int range = (64 * scale_fac); |
| 378 |
|
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VECTOR pmv[4]; |
| 380 |
uint32_t psad[4]; |
| 381 |
|
| 382 |
int mv_x, mv_y; |
| 383 |
int pmv_x, pmv_y; |
| 384 |
|
| 385 |
|
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get_pmvdata(dec->mbs, x, y, dec->mb_width, k, pmv, psad); |
| 387 |
|
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pmv_x = pmv[0].x; |
| 389 |
pmv_y = pmv[0].y; |
| 390 |
|
| 391 |
mv_x = get_mv(bs, fcode); |
| 392 |
mv_y = get_mv(bs, fcode); |
| 393 |
|
| 394 |
mv_x += pmv_x; |
| 395 |
mv_y += pmv_y; |
| 396 |
|
| 397 |
if (mv_x < low) |
| 398 |
{ |
| 399 |
mv_x += range; |
| 400 |
} |
| 401 |
else if (mv_x > high) |
| 402 |
{ |
| 403 |
mv_x -= range; |
| 404 |
} |
| 405 |
|
| 406 |
if (mv_y < low) |
| 407 |
{ |
| 408 |
mv_y += range; |
| 409 |
} |
| 410 |
else if (mv_y > high) |
| 411 |
{ |
| 412 |
mv_y -= range; |
| 413 |
} |
| 414 |
|
| 415 |
mv->x = mv_x; |
| 416 |
mv->y = mv_y; |
| 417 |
|
| 418 |
} |
| 419 |
|
| 420 |
|
| 421 |
void decoder_pframe(DECODER * dec, Bitstream * bs, int rounding, int quant, int fcode, int intra_dc_threshold) |
| 422 |
{ |
| 423 |
uint32_t x, y; |
| 424 |
|
| 425 |
image_swap(&dec->cur, &dec->refn); |
| 426 |
|
| 427 |
start_timer(); |
| 428 |
image_setedges(&dec->refn, dec->edged_width, dec->edged_height, dec->width, dec->height); |
| 429 |
stop_edges_timer(); |
| 430 |
|
| 431 |
for (y = 0; y < dec->mb_height; y++) |
| 432 |
{ |
| 433 |
for (x = 0; x < dec->mb_width; x++) |
| 434 |
{ |
| 435 |
MACROBLOCK * mb = &dec->mbs[y*dec->mb_width + x]; |
| 436 |
|
| 437 |
if (!BitstreamGetBit(bs)) // not_coded |
| 438 |
{ |
| 439 |
uint32_t mcbpc; |
| 440 |
uint32_t cbpc; |
| 441 |
uint32_t acpred_flag; |
| 442 |
uint32_t cbpy; |
| 443 |
uint32_t cbp; |
| 444 |
uint32_t intra; |
| 445 |
|
| 446 |
mcbpc = get_mcbpc_inter(bs); |
| 447 |
mb->mode = mcbpc & 7; |
| 448 |
cbpc = (mcbpc >> 4); |
| 449 |
|
| 450 |
intra = (mb->mode == MODE_INTRA || mb->mode == MODE_INTRA_Q); |
| 451 |
|
| 452 |
if (intra) |
| 453 |
{ |
| 454 |
acpred_flag = BitstreamGetBit(bs); |
| 455 |
} |
| 456 |
|
| 457 |
if (mb->mode == MODE_STUFFING) |
| 458 |
{ |
| 459 |
DEBUG("-- STUFFING ?"); |
| 460 |
continue; |
| 461 |
} |
| 462 |
|
| 463 |
cbpy = get_cbpy(bs, intra); |
| 464 |
cbp = (cbpy << 2) | cbpc; |
| 465 |
|
| 466 |
if (mb->mode == MODE_INTER_Q || mb->mode == MODE_INTRA_Q) |
| 467 |
{ |
| 468 |
quant += dquant_table[BitstreamGetBits(bs,2)]; |
| 469 |
if (quant > 31) |
| 470 |
{ |
| 471 |
quant = 31; |
| 472 |
} |
| 473 |
else if (mb->quant < 1) |
| 474 |
{ |
| 475 |
quant = 1; |
| 476 |
} |
| 477 |
} |
| 478 |
mb->quant = quant; |
| 479 |
|
| 480 |
if (mb->mode == MODE_INTER || mb->mode == MODE_INTER_Q) |
| 481 |
{ |
| 482 |
|
| 483 |
get_motion_vector(dec, bs, x, y, 0, &mb->mvs[0], fcode); |
| 484 |
mb->mvs[1].x = mb->mvs[2].x = mb->mvs[3].x = mb->mvs[0].x; |
| 485 |
mb->mvs[1].y = mb->mvs[2].y = mb->mvs[3].y = mb->mvs[0].y; |
| 486 |
} |
| 487 |
else if (mb->mode == MODE_INTER4V /* || mb->mode == MODE_INTER4V_Q */) |
| 488 |
{ |
| 489 |
get_motion_vector(dec, bs, x, y, 0, &mb->mvs[0], fcode); |
| 490 |
get_motion_vector(dec, bs, x, y, 1, &mb->mvs[1], fcode); |
| 491 |
get_motion_vector(dec, bs, x, y, 2, &mb->mvs[2], fcode); |
| 492 |
get_motion_vector(dec, bs, x, y, 3, &mb->mvs[3], fcode); |
| 493 |
} |
| 494 |
else // MODE_INTRA, MODE_INTRA_Q |
| 495 |
{ |
| 496 |
mb->mvs[0].x = mb->mvs[1].x = mb->mvs[2].x = mb->mvs[3].x = 0; |
| 497 |
mb->mvs[0].y = mb->mvs[1].y = mb->mvs[2].y = mb->mvs[3].y = 0; |
| 498 |
decoder_mbintra(dec, mb, x, y, acpred_flag, cbp, bs, quant, intra_dc_threshold); |
| 499 |
continue; |
| 500 |
} |
| 501 |
|
| 502 |
decoder_mbinter(dec, mb, x, y, acpred_flag, cbp, bs, quant, rounding); |
| 503 |
} |
| 504 |
else // not coded |
| 505 |
{ |
| 506 |
|
| 507 |
mb->mode = MODE_NOT_CODED; |
| 508 |
mb->mvs[0].x = mb->mvs[1].x = mb->mvs[2].x = mb->mvs[3].x = 0; |
| 509 |
mb->mvs[0].y = mb->mvs[1].y = mb->mvs[2].y = mb->mvs[3].y = 0; |
| 510 |
|
| 511 |
// copy macroblock directly from ref to cur |
| 512 |
|
| 513 |
start_timer(); |
| 514 |
|
| 515 |
transfer8x8_copy(dec->cur.y + (16*y)*dec->edged_width + (16*x), |
| 516 |
dec->refn.y + (16*y)*dec->edged_width + (16*x), |
| 517 |
dec->edged_width); |
| 518 |
|
| 519 |
transfer8x8_copy(dec->cur.y + (16*y)*dec->edged_width + (16*x+8), |
| 520 |
dec->refn.y + (16*y)*dec->edged_width + (16*x+8), |
| 521 |
dec->edged_width); |
| 522 |
|
| 523 |
transfer8x8_copy(dec->cur.y + (16*y+8)*dec->edged_width + (16*x), |
| 524 |
dec->refn.y + (16*y+8)*dec->edged_width + (16*x), |
| 525 |
dec->edged_width); |
| 526 |
|
| 527 |
transfer8x8_copy(dec->cur.y + (16*y+8)*dec->edged_width + (16*x+8), |
| 528 |
dec->refn.y + (16*y+8)*dec->edged_width + (16*x+8), |
| 529 |
dec->edged_width); |
| 530 |
|
| 531 |
transfer8x8_copy(dec->cur.u + (8*y)*dec->edged_width/2 + (8*x), |
| 532 |
dec->refn.u + (8*y)*dec->edged_width/2 + (8*x), |
| 533 |
dec->edged_width/2); |
| 534 |
|
| 535 |
transfer8x8_copy(dec->cur.v + (8*y)*dec->edged_width/2 + (8*x), |
| 536 |
dec->refn.v + (8*y)*dec->edged_width/2 + (8*x), |
| 537 |
dec->edged_width/2); |
| 538 |
|
| 539 |
stop_transfer_timer(); |
| 540 |
} |
| 541 |
} |
| 542 |
} |
| 543 |
} |
| 544 |
|
| 545 |
int decoder_decode(DECODER * dec, XVID_DEC_FRAME * frame) |
| 546 |
{ |
| 547 |
Bitstream bs; |
| 548 |
uint32_t rounding; |
| 549 |
uint32_t quant; |
| 550 |
uint32_t fcode; |
| 551 |
uint32_t intra_dc_threshold; |
| 552 |
|
| 553 |
start_global_timer(); |
| 554 |
|
| 555 |
BitstreamInit(&bs, frame->bitstream, frame->length); |
| 556 |
|
| 557 |
switch (BitstreamReadHeaders(&bs, dec, &rounding, &quant, &fcode, &intra_dc_threshold)) |
| 558 |
{ |
| 559 |
case P_VOP : |
| 560 |
decoder_pframe(dec, &bs, rounding, quant, fcode, intra_dc_threshold); |
| 561 |
break; |
| 562 |
|
| 563 |
case I_VOP : |
| 564 |
//DEBUG1("",intra_dc_threshold); |
| 565 |
decoder_iframe(dec, &bs, quant, intra_dc_threshold); |
| 566 |
break; |
| 567 |
|
| 568 |
case B_VOP : // ignore |
| 569 |
break; |
| 570 |
|
| 571 |
case N_VOP : // vop not coded |
| 572 |
break; |
| 573 |
|
| 574 |
default : |
| 575 |
return XVID_ERR_FAIL; |
| 576 |
} |
| 577 |
|
| 578 |
frame->length = BitstreamPos(&bs) / 8; |
| 579 |
|
| 580 |
start_timer(); |
| 581 |
image_output(&dec->cur, dec->width, dec->height, dec->edged_width, |
| 582 |
frame->image, frame->stride, frame->colorspace); |
| 583 |
stop_conv_timer(); |
| 584 |
|
| 585 |
emms(); |
| 586 |
|
| 587 |
stop_global_timer(); |
| 588 |
|
| 589 |
return XVID_ERR_OK; |
| 590 |
} |
