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;
43 memset(si, 0, sizeof(SliceInfo));
46 si->type = get_bits(gb, 2);
47 if(si->type == 1) si->type = 0;
50 si->quant = get_bits(gb, 5);
52 si->pts = get_bits(gb, 13);
53 rpr = get_bits(gb, r->rpr);
54 if (r->s.avctx->extradata_size < 8 + rpr*2) {
55 av_log(r->s.avctx, AV_LOG_WARNING,
56 "Extradata does not contain selected resolution\n");
60 w = r->s.avctx->extradata[6 + rpr*2] << 2;
61 h = r->s.avctx->extradata[7 + rpr*2] << 2;
65 mb_size = ((w + 15) >> 4) * ((h + 15) >> 4);
66 mb_bits = ff_rv34_get_start_offset(gb, mb_size);
67 si->start = get_bits(gb, mb_bits);
73 * Decode 4x4 intra types array.
75 static int rv30_decode_intra_types(RV34DecContext *r, GetBitContext *gb, int8_t *dst)
79 for(i = 0; i < 4; i++, dst += r->intra_types_stride - 4){
80 for(j = 0; j < 4; j+= 2){
81 unsigned code = svq3_get_ue_golomb(gb) << 1;
83 av_log(r->s.avctx, AV_LOG_ERROR, "Incorrect intra prediction code\n");
86 for(k = 0; k < 2; k++){
87 int A = dst[-r->intra_types_stride] + 1;
89 *dst++ = rv30_itype_from_context[A * 90 + B * 9 + rv30_itype_code[code + k]];
91 av_log(r->s.avctx, AV_LOG_ERROR, "Incorrect intra prediction mode\n");
101 * Decode macroblock information.
103 static int rv30_decode_mb_info(RV34DecContext *r)
105 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 };
106 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 };
107 MpegEncContext *s = &r->s;
108 GetBitContext *gb = &s->gb;
109 unsigned code = svq3_get_ue_golomb(gb);
112 av_log(s->avctx, AV_LOG_ERROR, "Incorrect MB type code\n");
116 av_log(s->avctx, AV_LOG_ERROR, "dquant needed\n");
119 if(s->pict_type != AV_PICTURE_TYPE_B)
120 return rv30_p_types[code];
122 return rv30_b_types[code];
125 static inline void rv30_weak_loop_filter(uint8_t *src, const int step,
126 const int stride, const int lim)
128 uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
131 for(i = 0; i < 4; i++){
132 diff = ((src[-2*step] - src[1*step]) - (src[-1*step] - src[0*step])*4) >> 3;
133 diff = av_clip(diff, -lim, lim);
134 src[-1*step] = cm[src[-1*step] + diff];
135 src[ 0*step] = cm[src[ 0*step] - diff];
140 static void rv30_loop_filter(RV34DecContext *r, int row)
142 MpegEncContext *s = &r->s;
146 int loc_lim, cur_lim, left_lim = 0, top_lim = 0;
148 mb_pos = row * s->mb_stride;
149 for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
150 int mbtype = s->current_picture_ptr->f.mb_type[mb_pos];
151 if(IS_INTRA(mbtype) || IS_SEPARATE_DC(mbtype))
152 r->deblock_coefs[mb_pos] = 0xFFFF;
154 r->cbp_chroma[mb_pos] = 0xFF;
157 /* all vertical edges are filtered first
158 * and horizontal edges are filtered on the next iteration
160 mb_pos = row * s->mb_stride;
161 for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
162 cur_lim = rv30_loop_filt_lim[s->current_picture_ptr->f.qscale_table[mb_pos]];
164 left_lim = rv30_loop_filt_lim[s->current_picture_ptr->f.qscale_table[mb_pos - 1]];
165 for(j = 0; j < 16; j += 4){
166 Y = s->current_picture_ptr->f.data[0] + mb_x*16 + (row*16 + j) * s->linesize + 4 * !mb_x;
167 for(i = !mb_x; i < 4; i++, Y += 4){
170 if(r->deblock_coefs[mb_pos] & (1 << ij))
172 else if(!i && r->deblock_coefs[mb_pos - 1] & (1 << (ij + 3)))
174 else if( i && r->deblock_coefs[mb_pos] & (1 << (ij - 1)))
177 rv30_weak_loop_filter(Y, 1, s->linesize, loc_lim);
180 for(k = 0; k < 2; k++){
181 int cur_cbp, left_cbp = 0;
182 cur_cbp = (r->cbp_chroma[mb_pos] >> (k*4)) & 0xF;
184 left_cbp = (r->cbp_chroma[mb_pos - 1] >> (k*4)) & 0xF;
185 for(j = 0; j < 8; j += 4){
186 C = s->current_picture_ptr->f.data[k + 1] + mb_x*8 + (row*8 + j) * s->uvlinesize + 4 * !mb_x;
187 for(i = !mb_x; i < 2; i++, C += 4){
188 int ij = i + (j >> 1);
190 if(cur_cbp && (1 << ij))
192 else if(!i && left_cbp & (1 << (ij + 1)))
194 else if( i && cur_cbp & (1 << (ij - 1)))
197 rv30_weak_loop_filter(C, 1, s->uvlinesize, loc_lim);
202 mb_pos = row * s->mb_stride;
203 for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
204 cur_lim = rv30_loop_filt_lim[s->current_picture_ptr->f.qscale_table[mb_pos]];
206 top_lim = rv30_loop_filt_lim[s->current_picture_ptr->f.qscale_table[mb_pos - s->mb_stride]];
207 for(j = 4*!row; j < 16; j += 4){
208 Y = s->current_picture_ptr->f.data[0] + mb_x*16 + (row*16 + j) * s->linesize;
209 for(i = 0; i < 4; i++, Y += 4){
212 if(r->deblock_coefs[mb_pos] & (1 << ij))
214 else if(!j && r->deblock_coefs[mb_pos - s->mb_stride] & (1 << (ij + 12)))
216 else if( j && r->deblock_coefs[mb_pos] & (1 << (ij - 4)))
219 rv30_weak_loop_filter(Y, s->linesize, 1, loc_lim);
222 for(k = 0; k < 2; k++){
223 int cur_cbp, top_cbp = 0;
224 cur_cbp = (r->cbp_chroma[mb_pos] >> (k*4)) & 0xF;
226 top_cbp = (r->cbp_chroma[mb_pos - s->mb_stride] >> (k*4)) & 0xF;
227 for(j = 4*!row; j < 8; j += 4){
228 C = s->current_picture_ptr->f.data[k+1] + mb_x*8 + (row*8 + j) * s->uvlinesize;
229 for(i = 0; i < 2; i++, C += 4){
230 int ij = i + (j >> 1);
232 if(r->cbp_chroma[mb_pos] && (1 << ij))
234 else if(!j && top_cbp & (1 << (ij + 2)))
236 else if( j && cur_cbp & (1 << (ij - 2)))
239 rv30_weak_loop_filter(C, s->uvlinesize, 1, loc_lim);
247 * Initialize decoder.
249 static av_cold int rv30_decode_init(AVCodecContext *avctx)
251 RV34DecContext *r = avctx->priv_data;
254 ff_rv34_decode_init(avctx);
255 if(avctx->extradata_size < 2){
256 av_log(avctx, AV_LOG_ERROR, "Extradata is too small.\n");
259 r->rpr = (avctx->extradata[1] & 7) >> 1;
260 r->rpr = FFMIN(r->rpr + 1, 3);
261 if(avctx->extradata_size - 8 < (r->rpr - 1) * 2){
262 av_log(avctx, AV_LOG_ERROR, "Insufficient extradata - need at least %d bytes, got %d\n",
263 6 + r->rpr * 2, avctx->extradata_size);
265 r->parse_slice_header = rv30_parse_slice_header;
266 r->decode_intra_types = rv30_decode_intra_types;
267 r->decode_mb_info = rv30_decode_mb_info;
268 r->loop_filter = rv30_loop_filter;
269 r->luma_dc_quant_i = rv30_luma_dc_quant;
270 r->luma_dc_quant_p = rv30_luma_dc_quant;
274 AVCodec ff_rv30_decoder = {
276 .type = AVMEDIA_TYPE_VIDEO,
277 .id = AV_CODEC_ID_RV30,
278 .priv_data_size = sizeof(RV34DecContext),
279 .init = rv30_decode_init,
280 .close = ff_rv34_decode_end,
281 .decode = ff_rv34_decode_frame,
282 .capabilities = CODEC_CAP_DR1 | CODEC_CAP_DELAY |
283 CODEC_CAP_FRAME_THREADS,
284 .flush = ff_mpeg_flush,
285 .long_name = NULL_IF_CONFIG_SMALL("RealVideo 3.0"),
286 .pix_fmts = ff_pixfmt_list_420,
287 .init_thread_copy = ONLY_IF_THREADS_ENABLED(ff_rv34_decode_init_thread_copy),
288 .update_thread_context = ONLY_IF_THREADS_ENABLED(ff_rv34_decode_update_thread_context),