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https://git.ffmpeg.org/ffmpeg.git
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280 lines
8.6 KiB
C
280 lines
8.6 KiB
C
/*
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* RV40 decoder
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* Copyright (c) 2007 Konstantin Shishkov
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg 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 GNU
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* 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
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file rv40.c
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* RV40 decoder
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*/
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#include "avcodec.h"
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#include "dsputil.h"
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#include "mpegvideo.h"
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#include "golomb.h"
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#include "rv34.h"
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#include "rv40vlc2.h"
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#include "rv40data.h"
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static VLC aic_top_vlc;
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static VLC aic_mode1_vlc[AIC_MODE1_NUM], aic_mode2_vlc[AIC_MODE2_NUM];
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static VLC ptype_vlc[NUM_PTYPE_VLCS], btype_vlc[NUM_BTYPE_VLCS];
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/**
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* Initialize all tables.
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*/
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static void rv40_init_tables()
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{
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int i;
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init_vlc(&aic_top_vlc, AIC_TOP_BITS, AIC_TOP_SIZE,
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rv40_aic_top_vlc_bits, 1, 1,
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rv40_aic_top_vlc_codes, 1, 1, INIT_VLC_USE_STATIC);
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for(i = 0; i < AIC_MODE1_NUM; i++){
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// Every tenth VLC table is empty
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if((i % 10) == 9) continue;
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init_vlc(&aic_mode1_vlc[i], AIC_MODE1_BITS, AIC_MODE1_SIZE,
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aic_mode1_vlc_bits[i], 1, 1,
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aic_mode1_vlc_codes[i], 1, 1, INIT_VLC_USE_STATIC);
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}
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for(i = 0; i < AIC_MODE2_NUM; i++){
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init_vlc(&aic_mode2_vlc[i], AIC_MODE2_BITS, AIC_MODE2_SIZE,
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aic_mode2_vlc_bits[i], 1, 1,
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aic_mode2_vlc_codes[i], 2, 2, INIT_VLC_USE_STATIC);
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}
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for(i = 0; i < NUM_PTYPE_VLCS; i++)
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init_vlc_sparse(&ptype_vlc[i], PTYPE_VLC_BITS, PTYPE_VLC_SIZE,
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ptype_vlc_bits[i], 1, 1,
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ptype_vlc_codes[i], 1, 1,
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ptype_vlc_syms, 1, 1, INIT_VLC_USE_STATIC);
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for(i = 0; i < NUM_BTYPE_VLCS; i++)
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init_vlc_sparse(&btype_vlc[i], BTYPE_VLC_BITS, BTYPE_VLC_SIZE,
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btype_vlc_bits[i], 1, 1,
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btype_vlc_codes[i], 1, 1,
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btype_vlc_syms, 1, 1, INIT_VLC_USE_STATIC);
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}
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/**
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* Get stored dimension from bitstream.
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*
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* If the width/height is the standard one then it's coded as a 3-bit index.
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* Otherwise it is coded as escaped 8-bit portions.
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*/
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static int get_dimension(GetBitContext *gb, const int *dim)
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{
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int t = get_bits(gb, 3);
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int val = dim[t];
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if(val < 0)
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val = dim[get_bits1(gb) - val];
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if(!val){
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do{
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t = get_bits(gb, 8);
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val += t << 2;
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}while(t == 0xFF);
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}
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return val;
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}
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/**
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* Get encoded picture size - usually this is called from rv40_parse_slice_header.
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*/
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static void rv40_parse_picture_size(GetBitContext *gb, int *w, int *h)
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{
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*w = get_dimension(gb, rv40_standard_widths);
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*h = get_dimension(gb, rv40_standard_heights);
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}
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static int rv40_parse_slice_header(RV34DecContext *r, GetBitContext *gb, SliceInfo *si)
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{
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int t, mb_bits;
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int w = r->s.width, h = r->s.height;
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int mb_size;
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memset(si, 0, sizeof(SliceInfo));
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if(get_bits1(gb))
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return -1;
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si->type = get_bits(gb, 2);
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if(si->type == 1) si->type = 0;
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si->quant = get_bits(gb, 5);
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if(get_bits(gb, 2))
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return -1;
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si->vlc_set = get_bits(gb, 2);
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skip_bits1(gb);
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t = get_bits(gb, 13); /// ???
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if(!si->type || !get_bits1(gb))
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rv40_parse_picture_size(gb, &w, &h);
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if(avcodec_check_dimensions(r->s.avctx, w, h) < 0)
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return -1;
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si->width = w;
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si->height = h;
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mb_size = ((w + 15) >> 4) * ((h + 15) >> 4);
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mb_bits = ff_rv34_get_start_offset(gb, mb_size);
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si->start = get_bits(gb, mb_bits);
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return 0;
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}
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/**
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* Decode 4x4 intra types array.
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*/
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static int rv40_decode_intra_types(RV34DecContext *r, GetBitContext *gb, int8_t *dst)
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{
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MpegEncContext *s = &r->s;
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int i, j, k, v;
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int A, B, C;
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int pattern;
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int8_t *ptr;
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for(i = 0; i < 4; i++, dst += s->b4_stride){
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if(!i && s->first_slice_line){
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pattern = get_vlc2(gb, aic_top_vlc.table, AIC_TOP_BITS, 1);
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dst[0] = (pattern >> 2) & 2;
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dst[1] = (pattern >> 1) & 2;
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dst[2] = pattern & 2;
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dst[3] = (pattern << 1) & 2;
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continue;
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}
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ptr = dst;
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for(j = 0; j < 4; j++){
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/* Coefficients are read using VLC chosen by the prediction pattern
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* The first one (used for retrieving a pair of coefficients) is
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* constructed from the top, top right and left coefficients
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* The second one (used for retrieving only one coefficient) is
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* top + 10 * left.
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*/
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A = ptr[-s->b4_stride + 1]; // it won't be used for the last coefficient in a row
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B = ptr[-s->b4_stride];
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C = ptr[-1];
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pattern = A + (B << 4) + (C << 8);
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for(k = 0; k < MODE2_PATTERNS_NUM; k++)
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if(pattern == rv40_aic_table_index[k])
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break;
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if(j < 3 && k < MODE2_PATTERNS_NUM){ //pattern is found, decoding 2 coefficients
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v = get_vlc2(gb, aic_mode2_vlc[k].table, AIC_MODE2_BITS, 2);
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*ptr++ = v/9;
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*ptr++ = v%9;
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j++;
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}else{
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if(B != -1 && C != -1)
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v = get_vlc2(gb, aic_mode1_vlc[B + C*10].table, AIC_MODE1_BITS, 1);
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else{ // tricky decoding
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v = 0;
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switch(C){
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case -1: // code 0 -> 1, 1 -> 0
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if(B < 2)
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v = get_bits1(gb) ^ 1;
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break;
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case 0:
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case 2: // code 0 -> 2, 1 -> 0
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v = (get_bits1(gb) ^ 1) << 1;
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break;
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}
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}
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*ptr++ = v;
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}
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}
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}
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return 0;
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}
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/**
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* Decode macroblock information.
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*/
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static int rv40_decode_mb_info(RV34DecContext *r)
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{
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MpegEncContext *s = &r->s;
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GetBitContext *gb = &s->gb;
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int q, i;
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int prev_type = 0;
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int mb_pos = s->mb_x + s->mb_y * s->mb_stride;
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int blocks[RV34_MB_TYPES] = {0};
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int count = 0;
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if(!r->s.mb_skip_run)
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r->s.mb_skip_run = svq3_get_ue_golomb(gb) + 1;
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if(--r->s.mb_skip_run)
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return RV34_MB_SKIP;
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if(r->avail_cache[5-1])
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blocks[r->mb_type[mb_pos - 1]]++;
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if(r->avail_cache[5-4]){
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blocks[r->mb_type[mb_pos - s->mb_stride]]++;
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if(r->avail_cache[5-2])
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blocks[r->mb_type[mb_pos - s->mb_stride + 1]]++;
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if(r->avail_cache[5-5])
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blocks[r->mb_type[mb_pos - s->mb_stride - 1]]++;
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}
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for(i = 0; i < RV34_MB_TYPES; i++){
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if(blocks[i] > count){
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count = blocks[i];
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prev_type = i;
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}
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}
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if(s->pict_type == P_TYPE){
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prev_type = block_num_to_ptype_vlc_num[prev_type];
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q = get_vlc2(gb, ptype_vlc[prev_type].table, PTYPE_VLC_BITS, 1);
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if(q < PBTYPE_ESCAPE)
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return q;
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q = get_vlc2(gb, ptype_vlc[prev_type].table, PTYPE_VLC_BITS, 1);
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av_log(s->avctx, AV_LOG_ERROR, "Dquant for P-frame\n");
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}else{
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prev_type = block_num_to_btype_vlc_num[prev_type];
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q = get_vlc2(gb, btype_vlc[prev_type].table, BTYPE_VLC_BITS, 1);
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if(q < PBTYPE_ESCAPE)
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return q;
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q = get_vlc2(gb, btype_vlc[prev_type].table, BTYPE_VLC_BITS, 1);
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av_log(s->avctx, AV_LOG_ERROR, "Dquant for B-frame\n");
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}
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return 0;
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}
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/**
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* Initialize decoder.
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*/
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static int rv40_decode_init(AVCodecContext *avctx)
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{
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RV34DecContext *r = avctx->priv_data;
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r->rv30 = 0;
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ff_rv34_decode_init(avctx);
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if(!aic_top_vlc.bits)
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rv40_init_tables();
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r->parse_slice_header = rv40_parse_slice_header;
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r->decode_intra_types = rv40_decode_intra_types;
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r->decode_mb_info = rv40_decode_mb_info;
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r->luma_dc_quant_i = rv40_luma_dc_quant[0];
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r->luma_dc_quant_p = rv40_luma_dc_quant[1];
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return 0;
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}
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AVCodec rv40_decoder = {
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"rv40",
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CODEC_TYPE_VIDEO,
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CODEC_ID_RV40,
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sizeof(RV34DecContext),
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rv40_decode_init,
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NULL,
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ff_rv34_decode_end,
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ff_rv34_decode_frame,
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CODEC_CAP_DR1 | CODEC_CAP_DELAY,
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};
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