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)
37 AVCodecContext *avctx = r->s.avctx;
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, av_log2(r->max_rpr) + 1);
55 if (rpr > r->max_rpr) {
56 av_log(avctx, AV_LOG_ERROR, "rpr too large\n");
57 return AVERROR_INVALIDDATA;
60 if (avctx->extradata_size < rpr * 2 + 8) {
61 av_log(avctx, AV_LOG_ERROR,
62 "Insufficient extradata - need at least %d bytes, got %d\n",
63 8 + rpr * 2, avctx->extradata_size);
64 return AVERROR(EINVAL);
67 w = r->s.avctx->extradata[6 + rpr*2] << 2;
68 h = r->s.avctx->extradata[7 + rpr*2] << 2;
72 mb_size = ((w + 15) >> 4) * ((h + 15) >> 4);
73 mb_bits = ff_rv34_get_start_offset(gb, mb_size);
74 si->start = get_bits(gb, mb_bits);
80 * Decode 4x4 intra types array.
82 static int rv30_decode_intra_types(RV34DecContext *r, GetBitContext *gb, int8_t *dst)
86 for(i = 0; i < 4; i++, dst += r->intra_types_stride - 4){
87 for(j = 0; j < 4; j+= 2){
88 unsigned code = svq3_get_ue_golomb(gb) << 1;
90 av_log(r->s.avctx, AV_LOG_ERROR, "Incorrect intra prediction code\n");
93 for(k = 0; k < 2; k++){
94 int A = dst[-r->intra_types_stride] + 1;
96 *dst++ = rv30_itype_from_context[A * 90 + B * 9 + rv30_itype_code[code + k]];
98 av_log(r->s.avctx, AV_LOG_ERROR, "Incorrect intra prediction mode\n");
108 * Decode macroblock information.
110 static int rv30_decode_mb_info(RV34DecContext *r)
112 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 };
113 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 };
114 MpegEncContext *s = &r->s;
115 GetBitContext *gb = &s->gb;
116 unsigned code = svq3_get_ue_golomb(gb);
119 av_log(s->avctx, AV_LOG_ERROR, "Incorrect MB type code\n");
123 av_log(s->avctx, AV_LOG_ERROR, "dquant needed\n");
126 if(s->pict_type != AV_PICTURE_TYPE_B)
127 return rv30_p_types[code];
129 return rv30_b_types[code];
132 static inline void rv30_weak_loop_filter(uint8_t *src, const int step,
133 const int stride, const int lim)
135 const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP;
138 for(i = 0; i < 4; i++){
139 diff = ((src[-2*step] - src[1*step]) - (src[-1*step] - src[0*step])*4) >> 3;
140 diff = av_clip(diff, -lim, lim);
141 src[-1*step] = cm[src[-1*step] + diff];
142 src[ 0*step] = cm[src[ 0*step] - diff];
147 static void rv30_loop_filter(RV34DecContext *r, int row)
149 MpegEncContext *s = &r->s;
153 int loc_lim, cur_lim, left_lim = 0, top_lim = 0;
155 mb_pos = row * s->mb_stride;
156 for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
157 int mbtype = s->current_picture_ptr->mb_type[mb_pos];
158 if(IS_INTRA(mbtype) || IS_SEPARATE_DC(mbtype))
159 r->deblock_coefs[mb_pos] = 0xFFFF;
161 r->cbp_chroma[mb_pos] = 0xFF;
164 /* all vertical edges are filtered first
165 * and horizontal edges are filtered on the next iteration
167 mb_pos = row * s->mb_stride;
168 for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
169 cur_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos]];
171 left_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos - 1]];
172 for(j = 0; j < 16; j += 4){
173 Y = s->current_picture_ptr->f.data[0] + mb_x*16 + (row*16 + j) * s->linesize + 4 * !mb_x;
174 for(i = !mb_x; i < 4; i++, Y += 4){
177 if(r->deblock_coefs[mb_pos] & (1 << ij))
179 else if(!i && r->deblock_coefs[mb_pos - 1] & (1 << (ij + 3)))
181 else if( i && r->deblock_coefs[mb_pos] & (1 << (ij - 1)))
184 rv30_weak_loop_filter(Y, 1, s->linesize, loc_lim);
187 for(k = 0; k < 2; k++){
188 int cur_cbp, left_cbp = 0;
189 cur_cbp = (r->cbp_chroma[mb_pos] >> (k*4)) & 0xF;
191 left_cbp = (r->cbp_chroma[mb_pos - 1] >> (k*4)) & 0xF;
192 for(j = 0; j < 8; j += 4){
193 C = s->current_picture_ptr->f.data[k + 1] + mb_x*8 + (row*8 + j) * s->uvlinesize + 4 * !mb_x;
194 for(i = !mb_x; i < 2; i++, C += 4){
195 int ij = i + (j >> 1);
197 if (cur_cbp & (1 << ij))
199 else if(!i && left_cbp & (1 << (ij + 1)))
201 else if( i && cur_cbp & (1 << (ij - 1)))
204 rv30_weak_loop_filter(C, 1, s->uvlinesize, loc_lim);
209 mb_pos = row * s->mb_stride;
210 for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
211 cur_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos]];
213 top_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos - s->mb_stride]];
214 for(j = 4*!row; j < 16; j += 4){
215 Y = s->current_picture_ptr->f.data[0] + mb_x*16 + (row*16 + j) * s->linesize;
216 for(i = 0; i < 4; i++, Y += 4){
219 if(r->deblock_coefs[mb_pos] & (1 << ij))
221 else if(!j && r->deblock_coefs[mb_pos - s->mb_stride] & (1 << (ij + 12)))
223 else if( j && r->deblock_coefs[mb_pos] & (1 << (ij - 4)))
226 rv30_weak_loop_filter(Y, s->linesize, 1, loc_lim);
229 for(k = 0; k < 2; k++){
230 int cur_cbp, top_cbp = 0;
231 cur_cbp = (r->cbp_chroma[mb_pos] >> (k*4)) & 0xF;
233 top_cbp = (r->cbp_chroma[mb_pos - s->mb_stride] >> (k*4)) & 0xF;
234 for(j = 4*!row; j < 8; j += 4){
235 C = s->current_picture_ptr->f.data[k+1] + mb_x*8 + (row*8 + j) * s->uvlinesize;
236 for(i = 0; i < 2; i++, C += 4){
237 int ij = i + (j >> 1);
239 if (r->cbp_chroma[mb_pos] & (1 << ij))
241 else if(!j && top_cbp & (1 << (ij + 2)))
243 else if( j && cur_cbp & (1 << (ij - 2)))
246 rv30_weak_loop_filter(C, s->uvlinesize, 1, loc_lim);
254 * Initialize decoder.
256 static av_cold int rv30_decode_init(AVCodecContext *avctx)
258 RV34DecContext *r = avctx->priv_data;
262 if ((ret = ff_rv34_decode_init(avctx)) < 0)
264 if(avctx->extradata_size < 2){
265 av_log(avctx, AV_LOG_ERROR, "Extradata is too small.\n");
269 r->max_rpr = avctx->extradata[1] & 7;
270 if(avctx->extradata_size < 2*r->max_rpr + 8){
271 av_log(avctx, AV_LOG_WARNING, "Insufficient extradata - need at least %d bytes, got %d\n",
272 2*r->max_rpr + 8, avctx->extradata_size);
275 r->parse_slice_header = rv30_parse_slice_header;
276 r->decode_intra_types = rv30_decode_intra_types;
277 r->decode_mb_info = rv30_decode_mb_info;
278 r->loop_filter = rv30_loop_filter;
279 r->luma_dc_quant_i = rv30_luma_dc_quant;
280 r->luma_dc_quant_p = rv30_luma_dc_quant;
284 AVCodec ff_rv30_decoder = {
286 .long_name = NULL_IF_CONFIG_SMALL("RealVideo 3.0"),
287 .type = AVMEDIA_TYPE_VIDEO,
288 .id = AV_CODEC_ID_RV30,
289 .priv_data_size = sizeof(RV34DecContext),
290 .init = rv30_decode_init,
291 .close = ff_rv34_decode_end,
292 .decode = ff_rv34_decode_frame,
293 .capabilities = CODEC_CAP_DR1 | CODEC_CAP_DELAY |
294 CODEC_CAP_FRAME_THREADS,
295 .flush = ff_mpeg_flush,
296 .pix_fmts = ff_pixfmt_list_420,
297 .init_thread_copy = ONLY_IF_THREADS_ENABLED(ff_rv34_decode_init_thread_copy),
298 .update_thread_context = ONLY_IF_THREADS_ENABLED(ff_rv34_decode_update_thread_context),