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
28 #include "mpegvideo.h"
35 static int rv30_parse_slice_header(RV34DecContext *r, GetBitContext *gb, SliceInfo *si)
38 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 rpr = get_bits(gb, r->rpr);
53 if (r->s.avctx->extradata_size < 8 + rpr*2) {
54 av_log(r->s.avctx, AV_LOG_WARNING,
55 "Extradata does not contain selected resolution\n");
59 w = r->s.avctx->extradata[6 + rpr*2] << 2;
60 h = r->s.avctx->extradata[7 + rpr*2] << 2;
64 mb_size = ((w + 15) >> 4) * ((h + 15) >> 4);
65 mb_bits = ff_rv34_get_start_offset(gb, mb_size);
66 si->start = get_bits(gb, mb_bits);
72 * Decode 4x4 intra types array.
74 static int rv30_decode_intra_types(RV34DecContext *r, GetBitContext *gb, int8_t *dst)
78 for(i = 0; i < 4; i++, dst += r->intra_types_stride - 4){
79 for(j = 0; j < 4; j+= 2){
80 unsigned code = svq3_get_ue_golomb(gb) << 1;
82 av_log(r->s.avctx, AV_LOG_ERROR, "Incorrect intra prediction code\n");
85 for(k = 0; k < 2; k++){
86 int A = dst[-r->intra_types_stride] + 1;
88 *dst++ = rv30_itype_from_context[A * 90 + B * 9 + rv30_itype_code[code + k]];
90 av_log(r->s.avctx, AV_LOG_ERROR, "Incorrect intra prediction mode\n");
100 * Decode macroblock information.
102 static int rv30_decode_mb_info(RV34DecContext *r)
104 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 };
105 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 };
106 MpegEncContext *s = &r->s;
107 GetBitContext *gb = &s->gb;
108 unsigned code = svq3_get_ue_golomb(gb);
111 av_log(s->avctx, AV_LOG_ERROR, "Incorrect MB type code\n");
115 av_log(s->avctx, AV_LOG_ERROR, "dquant needed\n");
118 if(s->pict_type != AV_PICTURE_TYPE_B)
119 return rv30_p_types[code];
121 return rv30_b_types[code];
124 static inline void rv30_weak_loop_filter(uint8_t *src, const int step,
125 const int stride, const int lim)
127 const uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
130 for(i = 0; i < 4; i++){
131 diff = ((src[-2*step] - src[1*step]) - (src[-1*step] - src[0*step])*4) >> 3;
132 diff = av_clip(diff, -lim, lim);
133 src[-1*step] = cm[src[-1*step] + diff];
134 src[ 0*step] = cm[src[ 0*step] - diff];
139 static void rv30_loop_filter(RV34DecContext *r, int row)
141 MpegEncContext *s = &r->s;
145 int loc_lim, cur_lim, left_lim = 0, top_lim = 0;
147 mb_pos = row * s->mb_stride;
148 for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
149 int mbtype = s->current_picture_ptr->mb_type[mb_pos];
150 if(IS_INTRA(mbtype) || IS_SEPARATE_DC(mbtype))
151 r->deblock_coefs[mb_pos] = 0xFFFF;
153 r->cbp_chroma[mb_pos] = 0xFF;
156 /* all vertical edges are filtered first
157 * and horizontal edges are filtered on the next iteration
159 mb_pos = row * s->mb_stride;
160 for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
161 cur_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos]];
163 left_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos - 1]];
164 for(j = 0; j < 16; j += 4){
165 Y = s->current_picture_ptr->f.data[0] + mb_x*16 + (row*16 + j) * s->linesize + 4 * !mb_x;
166 for(i = !mb_x; i < 4; i++, Y += 4){
169 if(r->deblock_coefs[mb_pos] & (1 << ij))
171 else if(!i && r->deblock_coefs[mb_pos - 1] & (1 << (ij + 3)))
173 else if( i && r->deblock_coefs[mb_pos] & (1 << (ij - 1)))
176 rv30_weak_loop_filter(Y, 1, s->linesize, loc_lim);
179 for(k = 0; k < 2; k++){
180 int cur_cbp, left_cbp = 0;
181 cur_cbp = (r->cbp_chroma[mb_pos] >> (k*4)) & 0xF;
183 left_cbp = (r->cbp_chroma[mb_pos - 1] >> (k*4)) & 0xF;
184 for(j = 0; j < 8; j += 4){
185 C = s->current_picture_ptr->f.data[k + 1] + mb_x*8 + (row*8 + j) * s->uvlinesize + 4 * !mb_x;
186 for(i = !mb_x; i < 2; i++, C += 4){
187 int ij = i + (j >> 1);
189 if (cur_cbp & (1 << ij))
191 else if(!i && left_cbp & (1 << (ij + 1)))
193 else if( i && cur_cbp & (1 << (ij - 1)))
196 rv30_weak_loop_filter(C, 1, s->uvlinesize, loc_lim);
201 mb_pos = row * s->mb_stride;
202 for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
203 cur_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos]];
205 top_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos - s->mb_stride]];
206 for(j = 4*!row; j < 16; j += 4){
207 Y = s->current_picture_ptr->f.data[0] + mb_x*16 + (row*16 + j) * s->linesize;
208 for(i = 0; i < 4; i++, Y += 4){
211 if(r->deblock_coefs[mb_pos] & (1 << ij))
213 else if(!j && r->deblock_coefs[mb_pos - s->mb_stride] & (1 << (ij + 12)))
215 else if( j && r->deblock_coefs[mb_pos] & (1 << (ij - 4)))
218 rv30_weak_loop_filter(Y, s->linesize, 1, loc_lim);
221 for(k = 0; k < 2; k++){
222 int cur_cbp, top_cbp = 0;
223 cur_cbp = (r->cbp_chroma[mb_pos] >> (k*4)) & 0xF;
225 top_cbp = (r->cbp_chroma[mb_pos - s->mb_stride] >> (k*4)) & 0xF;
226 for(j = 4*!row; j < 8; j += 4){
227 C = s->current_picture_ptr->f.data[k+1] + mb_x*8 + (row*8 + j) * s->uvlinesize;
228 for(i = 0; i < 2; i++, C += 4){
229 int ij = i + (j >> 1);
231 if (r->cbp_chroma[mb_pos] & (1 << ij))
233 else if(!j && top_cbp & (1 << (ij + 2)))
235 else if( j && cur_cbp & (1 << (ij - 2)))
238 rv30_weak_loop_filter(C, s->uvlinesize, 1, loc_lim);
246 * Initialize decoder.
248 static av_cold int rv30_decode_init(AVCodecContext *avctx)
250 RV34DecContext *r = avctx->priv_data;
254 ret = ff_rv34_decode_init(avctx);
257 if(avctx->extradata_size < 2){
258 av_log(avctx, AV_LOG_ERROR, "Extradata is too small.\n");
261 r->rpr = (avctx->extradata[1] & 7) >> 1;
262 r->rpr = FFMIN(r->rpr + 1, 3);
263 if(avctx->extradata_size - 8 < (r->rpr - 1) * 2){
264 av_log(avctx, AV_LOG_ERROR, "Insufficient extradata - need at least %d bytes, got %d\n",
265 6 + r->rpr * 2, avctx->extradata_size);
267 r->parse_slice_header = rv30_parse_slice_header;
268 r->decode_intra_types = rv30_decode_intra_types;
269 r->decode_mb_info = rv30_decode_mb_info;
270 r->loop_filter = rv30_loop_filter;
271 r->luma_dc_quant_i = rv30_luma_dc_quant;
272 r->luma_dc_quant_p = rv30_luma_dc_quant;
276 AVCodec ff_rv30_decoder = {
278 .type = AVMEDIA_TYPE_VIDEO,
279 .id = AV_CODEC_ID_RV30,
280 .priv_data_size = sizeof(RV34DecContext),
281 .init = rv30_decode_init,
282 .close = ff_rv34_decode_end,
283 .decode = ff_rv34_decode_frame,
284 .capabilities = CODEC_CAP_DR1 | CODEC_CAP_DELAY |
285 CODEC_CAP_FRAME_THREADS,
286 .flush = ff_mpeg_flush,
287 .long_name = NULL_IF_CONFIG_SMALL("RealVideo 3.0"),
288 .pix_fmts = ff_pixfmt_list_420,
289 .init_thread_copy = ONLY_IF_THREADS_ENABLED(ff_rv34_decode_init_thread_copy),
290 .update_thread_context = ONLY_IF_THREADS_ENABLED(ff_rv34_decode_update_thread_context),