3 * Copyright (c) 2007 Konstantin Shishkov
5 * This file is part of Libav.
7 * Libav 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 * Libav 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 Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
28 #include "golomb_legacy.h"
29 #include "mpegutils.h"
30 #include "mpegvideo.h"
36 static int rv30_parse_slice_header(RV34DecContext *r, GetBitContext *gb, SliceInfo *si)
38 AVCodecContext *avctx = r->s.avctx;
40 int w = r->s.width, h = r->s.height;
44 memset(si, 0, sizeof(SliceInfo));
47 si->type = get_bits(gb, 2);
48 if(si->type == 1) si->type = 0;
51 si->quant = get_bits(gb, 5);
53 si->pts = get_bits(gb, 13);
54 rpr = get_bits(gb, r->rpr);
56 if (avctx->extradata_size < rpr * 2 + 8) {
57 av_log(avctx, AV_LOG_ERROR,
58 "Insufficient extradata - need at least %d bytes, got %d\n",
59 8 + rpr * 2, avctx->extradata_size);
60 return AVERROR(EINVAL);
63 w = r->s.avctx->extradata[6 + rpr*2] << 2;
64 h = r->s.avctx->extradata[7 + rpr*2] << 2;
68 mb_size = ((w + 15) >> 4) * ((h + 15) >> 4);
69 mb_bits = ff_rv34_get_start_offset(gb, mb_size);
70 si->start = get_bits(gb, mb_bits);
76 * Decode 4x4 intra types array.
78 static int rv30_decode_intra_types(RV34DecContext *r, GetBitContext *gb, int8_t *dst)
82 for(i = 0; i < 4; i++, dst += r->intra_types_stride - 4){
83 for(j = 0; j < 4; j+= 2){
84 unsigned code = get_interleaved_ue_golomb(gb) << 1;
86 av_log(r->s.avctx, AV_LOG_ERROR, "Incorrect intra prediction code\n");
89 for(k = 0; k < 2; k++){
90 int A = dst[-r->intra_types_stride] + 1;
92 *dst++ = rv30_itype_from_context[A * 90 + B * 9 + rv30_itype_code[code + k]];
94 av_log(r->s.avctx, AV_LOG_ERROR, "Incorrect intra prediction mode\n");
104 * Decode macroblock information.
106 static int rv30_decode_mb_info(RV34DecContext *r)
108 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 };
109 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 };
110 MpegEncContext *s = &r->s;
111 GetBitContext *gb = &s->gb;
112 unsigned code = get_interleaved_ue_golomb(gb);
115 av_log(s->avctx, AV_LOG_ERROR, "Incorrect MB type code\n");
119 av_log(s->avctx, AV_LOG_ERROR, "dquant needed\n");
122 if(s->pict_type != AV_PICTURE_TYPE_B)
123 return rv30_p_types[code];
125 return rv30_b_types[code];
128 static inline void rv30_weak_loop_filter(uint8_t *src, const int step,
129 const int stride, const int lim)
131 const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP;
134 for(i = 0; i < 4; i++){
135 diff = ((src[-2*step] - src[1*step]) - (src[-1*step] - src[0*step])*4) >> 3;
136 diff = av_clip(diff, -lim, lim);
137 src[-1*step] = cm[src[-1*step] + diff];
138 src[ 0*step] = cm[src[ 0*step] - diff];
143 static void rv30_loop_filter(RV34DecContext *r, int row)
145 MpegEncContext *s = &r->s;
149 int loc_lim, cur_lim, left_lim = 0, top_lim = 0;
151 mb_pos = row * s->mb_stride;
152 for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
153 int mbtype = s->current_picture_ptr->mb_type[mb_pos];
154 if(IS_INTRA(mbtype) || IS_SEPARATE_DC(mbtype))
155 r->deblock_coefs[mb_pos] = 0xFFFF;
157 r->cbp_chroma[mb_pos] = 0xFF;
160 /* all vertical edges are filtered first
161 * and horizontal edges are filtered on the next iteration
163 mb_pos = row * s->mb_stride;
164 for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
165 cur_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos]];
167 left_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos - 1]];
168 for(j = 0; j < 16; j += 4){
169 Y = s->current_picture_ptr->f->data[0] + mb_x*16 + (row*16 + j) * s->linesize + 4 * !mb_x;
170 for(i = !mb_x; i < 4; i++, Y += 4){
173 if(r->deblock_coefs[mb_pos] & (1 << ij))
175 else if(!i && r->deblock_coefs[mb_pos - 1] & (1 << (ij + 3)))
177 else if( i && r->deblock_coefs[mb_pos] & (1 << (ij - 1)))
180 rv30_weak_loop_filter(Y, 1, s->linesize, loc_lim);
183 for(k = 0; k < 2; k++){
184 int cur_cbp, left_cbp = 0;
185 cur_cbp = (r->cbp_chroma[mb_pos] >> (k*4)) & 0xF;
187 left_cbp = (r->cbp_chroma[mb_pos - 1] >> (k*4)) & 0xF;
188 for(j = 0; j < 8; j += 4){
189 C = s->current_picture_ptr->f->data[k + 1] + mb_x*8 + (row*8 + j) * s->uvlinesize + 4 * !mb_x;
190 for(i = !mb_x; i < 2; i++, C += 4){
191 int ij = i + (j >> 1);
193 if (cur_cbp & (1 << ij))
195 else if(!i && left_cbp & (1 << (ij + 1)))
197 else if( i && cur_cbp & (1 << (ij - 1)))
200 rv30_weak_loop_filter(C, 1, s->uvlinesize, loc_lim);
205 mb_pos = row * s->mb_stride;
206 for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
207 cur_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos]];
209 top_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos - s->mb_stride]];
210 for(j = 4*!row; j < 16; j += 4){
211 Y = s->current_picture_ptr->f->data[0] + mb_x*16 + (row*16 + j) * s->linesize;
212 for(i = 0; i < 4; i++, Y += 4){
215 if(r->deblock_coefs[mb_pos] & (1 << ij))
217 else if(!j && r->deblock_coefs[mb_pos - s->mb_stride] & (1 << (ij + 12)))
219 else if( j && r->deblock_coefs[mb_pos] & (1 << (ij - 4)))
222 rv30_weak_loop_filter(Y, s->linesize, 1, loc_lim);
225 for(k = 0; k < 2; k++){
226 int cur_cbp, top_cbp = 0;
227 cur_cbp = (r->cbp_chroma[mb_pos] >> (k*4)) & 0xF;
229 top_cbp = (r->cbp_chroma[mb_pos - s->mb_stride] >> (k*4)) & 0xF;
230 for(j = 4*!row; j < 8; j += 4){
231 C = s->current_picture_ptr->f->data[k+1] + mb_x*8 + (row*8 + j) * s->uvlinesize;
232 for(i = 0; i < 2; i++, C += 4){
233 int ij = i + (j >> 1);
235 if (r->cbp_chroma[mb_pos] & (1 << ij))
237 else if(!j && top_cbp & (1 << (ij + 2)))
239 else if( j && cur_cbp & (1 << (ij - 2)))
242 rv30_weak_loop_filter(C, s->uvlinesize, 1, loc_lim);
250 * Initialize decoder.
252 static av_cold int rv30_decode_init(AVCodecContext *avctx)
254 RV34DecContext *r = avctx->priv_data;
258 if ((ret = ff_rv34_decode_init(avctx)) < 0)
260 if(avctx->extradata_size < 2){
261 av_log(avctx, AV_LOG_ERROR, "Extradata is too small.\n");
264 r->rpr = (avctx->extradata[1] & 7) >> 1;
265 r->rpr = FFMIN(r->rpr + 1, 3);
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 .long_name = NULL_IF_CONFIG_SMALL("RealVideo 3.0"),
279 .type = AVMEDIA_TYPE_VIDEO,
280 .id = AV_CODEC_ID_RV30,
281 .priv_data_size = sizeof(RV34DecContext),
282 .init = rv30_decode_init,
283 .close = ff_rv34_decode_end,
284 .decode = ff_rv34_decode_frame,
285 .capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY |
286 AV_CODEC_CAP_FRAME_THREADS,
287 .flush = ff_mpeg_flush,
288 .pix_fmts = (const enum AVPixelFormat[]) {
292 .init_thread_copy = ONLY_IF_THREADS_ENABLED(ff_rv34_decode_init_thread_copy),
293 .update_thread_context = ONLY_IF_THREADS_ENABLED(ff_rv34_decode_update_thread_context),