3 * Copyright (c) 2007 Konstantin Shishkov
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
29 #include "mpegvideo.h"
36 static int rv30_parse_slice_header(RV34DecContext *r, GetBitContext *gb, SliceInfo *si)
39 int w = r->s.width, h = r->s.height;
42 memset(si, 0, sizeof(SliceInfo));
45 si->type = get_bits(gb, 2);
46 if(si->type == 1) si->type = 0;
49 si->quant = get_bits(gb, 5);
51 si->pts = get_bits(gb, 13);
52 skip_bits(gb, r->rpr);
55 mb_size = ((w + 15) >> 4) * ((h + 15) >> 4);
56 mb_bits = ff_rv34_get_start_offset(gb, mb_size);
57 si->start = get_bits(gb, mb_bits);
63 * Decode 4x4 intra types array.
65 static int rv30_decode_intra_types(RV34DecContext *r, GetBitContext *gb, int8_t *dst)
69 for(i = 0; i < 4; i++, dst += r->s.b4_stride - 4){
70 for(j = 0; j < 4; j+= 2){
71 int code = svq3_get_ue_golomb(gb) << 1;
73 av_log(r->s.avctx, AV_LOG_ERROR, "Incorrect intra prediction code\n");
76 for(k = 0; k < 2; k++){
77 int A = dst[-r->s.b4_stride] + 1;
79 *dst++ = rv30_itype_from_context[A * 90 + B * 9 + rv30_itype_code[code + k]];
81 av_log(r->s.avctx, AV_LOG_ERROR, "Incorrect intra prediction mode\n");
91 * Decode macroblock information.
93 static int rv30_decode_mb_info(RV34DecContext *r)
95 static const int rv30_p_types[6] = { RV34_MB_SKIP, RV34_MB_P_16x16, RV34_MB_P_8x8, -1, RV34_MB_TYPE_INTRA, RV34_MB_TYPE_INTRA16x16 };
96 static const int rv30_b_types[6] = { RV34_MB_SKIP, RV34_MB_B_DIRECT, RV34_MB_B_FORWARD, RV34_MB_B_BACKWARD, RV34_MB_TYPE_INTRA, RV34_MB_TYPE_INTRA16x16 };
97 MpegEncContext *s = &r->s;
98 GetBitContext *gb = &s->gb;
99 int code = svq3_get_ue_golomb(gb);
102 av_log(s->avctx, AV_LOG_ERROR, "Incorrect MB type code\n");
106 av_log(s->avctx, AV_LOG_ERROR, "dquant needed\n");
109 if(s->pict_type != FF_B_TYPE)
110 return rv30_p_types[code];
112 return rv30_b_types[code];
115 static inline void rv30_weak_loop_filter(uint8_t *src, const int step,
116 const int stride, const int lim)
118 uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
121 for(i = 0; i < 4; i++){
122 diff = ((src[-2*step] - src[1*step]) - (src[-1*step] - src[0*step])*4) >> 3;
123 diff = av_clip(diff, -lim, lim);
124 src[-1*step] = cm[src[-1*step] + diff];
125 src[ 0*step] = cm[src[ 0*step] - diff];
130 static void rv30_loop_filter(RV34DecContext *r, int row)
132 MpegEncContext *s = &r->s;
136 int loc_lim, cur_lim, left_lim = 0, top_lim = 0;
138 mb_pos = row * s->mb_stride;
139 for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
140 int mbtype = s->current_picture_ptr->mb_type[mb_pos];
141 if(IS_INTRA(mbtype) || IS_SEPARATE_DC(mbtype))
142 r->deblock_coefs[mb_pos] = 0xFFFF;
144 r->cbp_chroma[mb_pos] = 0xFF;
147 /* all vertical edges are filtered first
148 * and horizontal edges are filtered on the next iteration
150 mb_pos = row * s->mb_stride;
151 for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
152 cur_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos]];
154 left_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos - 1]];
155 for(j = 0; j < 16; j += 4){
156 Y = s->current_picture_ptr->data[0] + mb_x*16 + (row*16 + j) * s->linesize + 4 * !mb_x;
157 for(i = !mb_x; i < 4; i++, Y += 4){
160 if(r->deblock_coefs[mb_pos] & (1 << ij))
162 else if(!i && r->deblock_coefs[mb_pos - 1] & (1 << (ij + 3)))
164 else if( i && r->deblock_coefs[mb_pos] & (1 << (ij - 1)))
167 rv30_weak_loop_filter(Y, 1, s->linesize, loc_lim);
170 for(k = 0; k < 2; k++){
171 int cur_cbp, left_cbp = 0;
172 cur_cbp = (r->cbp_chroma[mb_pos] >> (k*4)) & 0xF;
174 left_cbp = (r->cbp_chroma[mb_pos - 1] >> (k*4)) & 0xF;
175 for(j = 0; j < 8; j += 4){
176 C = s->current_picture_ptr->data[k+1] + mb_x*8 + (row*8 + j) * s->uvlinesize + 4 * !mb_x;
177 for(i = !mb_x; i < 2; i++, C += 4){
178 int ij = i + (j >> 1);
180 if(cur_cbp && (1 << ij))
182 else if(!i && left_cbp & (1 << (ij + 1)))
184 else if( i && cur_cbp & (1 << (ij - 1)))
187 rv30_weak_loop_filter(C, 1, s->uvlinesize, loc_lim);
192 mb_pos = row * s->mb_stride;
193 for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
194 cur_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos]];
196 top_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos - s->mb_stride]];
197 for(j = 4*!row; j < 16; j += 4){
198 Y = s->current_picture_ptr->data[0] + mb_x*16 + (row*16 + j) * s->linesize;
199 for(i = 0; i < 4; i++, Y += 4){
202 if(r->deblock_coefs[mb_pos] & (1 << ij))
204 else if(!j && r->deblock_coefs[mb_pos - s->mb_stride] & (1 << (ij + 12)))
206 else if( j && r->deblock_coefs[mb_pos] & (1 << (ij - 4)))
209 rv30_weak_loop_filter(Y, s->linesize, 1, loc_lim);
212 for(k = 0; k < 2; k++){
213 int cur_cbp, top_cbp = 0;
214 cur_cbp = (r->cbp_chroma[mb_pos] >> (k*4)) & 0xF;
216 top_cbp = (r->cbp_chroma[mb_pos - s->mb_stride] >> (k*4)) & 0xF;
217 for(j = 4*!row; j < 8; j += 4){
218 C = s->current_picture_ptr->data[k+1] + mb_x*8 + (row*8 + j) * s->uvlinesize;
219 for(i = 0; i < 2; i++, C += 4){
220 int ij = i + (j >> 1);
222 if(r->cbp_chroma[mb_pos] && (1 << ij))
224 else if(!j && top_cbp & (1 << (ij + 2)))
226 else if( j && cur_cbp & (1 << (ij - 2)))
229 rv30_weak_loop_filter(C, s->uvlinesize, 1, loc_lim);
237 * Initialize decoder.
239 static av_cold int rv30_decode_init(AVCodecContext *avctx)
241 RV34DecContext *r = avctx->priv_data;
244 ff_rv34_decode_init(avctx);
245 if(avctx->extradata_size < 2){
246 av_log(avctx, AV_LOG_ERROR, "Extradata is too small.\n");
249 r->rpr = (avctx->extradata[1] & 7) >> 1;
250 r->rpr = FFMIN(r->rpr + 1, 3);
251 r->parse_slice_header = rv30_parse_slice_header;
252 r->decode_intra_types = rv30_decode_intra_types;
253 r->decode_mb_info = rv30_decode_mb_info;
254 r->loop_filter = rv30_loop_filter;
255 r->luma_dc_quant_i = rv30_luma_dc_quant;
256 r->luma_dc_quant_p = rv30_luma_dc_quant;
260 AVCodec rv30_decoder = {
264 sizeof(RV34DecContext),
268 ff_rv34_decode_frame,
269 CODEC_CAP_DR1 | CODEC_CAP_DELAY,
270 .long_name = NULL_IF_CONFIG_SMALL("RealVideo 3.0"),