Add ff_ prefix to data symbols of encoders, decoders, hwaccel, parsers, bsf.
[libav.git] / libavcodec / rv30.c
1 /*
2 * RV30 decoder
3 * Copyright (c) 2007 Konstantin Shishkov
4 *
5 * This file is part of FFmpeg.
6 *
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.
11 *
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.
16 *
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
20 */
21
22 /**
23 * @file
24 * RV30 decoder
25 */
26
27 #include "avcodec.h"
28 #include "dsputil.h"
29 #include "mpegvideo.h"
30 #include "golomb.h"
31
32 #include "rv34.h"
33 #include "rv30data.h"
34
35
36 static int rv30_parse_slice_header(RV34DecContext *r, GetBitContext *gb, SliceInfo *si)
37 {
38 int mb_bits;
39 int w = r->s.width, h = r->s.height;
40 int mb_size;
41 int rpr;
42
43 memset(si, 0, sizeof(SliceInfo));
44 if(get_bits(gb, 3))
45 return -1;
46 si->type = get_bits(gb, 2);
47 if(si->type == 1) si->type = 0;
48 if(get_bits1(gb))
49 return -1;
50 si->quant = get_bits(gb, 5);
51 skip_bits1(gb);
52 si->pts = get_bits(gb, 13);
53 rpr = get_bits(gb, r->rpr);
54 if(rpr){
55 w = r->s.avctx->extradata[6 + rpr*2] << 2;
56 h = r->s.avctx->extradata[7 + rpr*2] << 2;
57 }
58 si->width = w;
59 si->height = h;
60 mb_size = ((w + 15) >> 4) * ((h + 15) >> 4);
61 mb_bits = ff_rv34_get_start_offset(gb, mb_size);
62 si->start = get_bits(gb, mb_bits);
63 skip_bits1(gb);
64 return 0;
65 }
66
67 /**
68 * Decode 4x4 intra types array.
69 */
70 static int rv30_decode_intra_types(RV34DecContext *r, GetBitContext *gb, int8_t *dst)
71 {
72 int i, j, k;
73
74 for(i = 0; i < 4; i++, dst += r->intra_types_stride - 4){
75 for(j = 0; j < 4; j+= 2){
76 int code = svq3_get_ue_golomb(gb) << 1;
77 if(code >= 81*2){
78 av_log(r->s.avctx, AV_LOG_ERROR, "Incorrect intra prediction code\n");
79 return -1;
80 }
81 for(k = 0; k < 2; k++){
82 int A = dst[-r->intra_types_stride] + 1;
83 int B = dst[-1] + 1;
84 *dst++ = rv30_itype_from_context[A * 90 + B * 9 + rv30_itype_code[code + k]];
85 if(dst[-1] == 9){
86 av_log(r->s.avctx, AV_LOG_ERROR, "Incorrect intra prediction mode\n");
87 return -1;
88 }
89 }
90 }
91 }
92 return 0;
93 }
94
95 /**
96 * Decode macroblock information.
97 */
98 static int rv30_decode_mb_info(RV34DecContext *r)
99 {
100 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 };
101 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 };
102 MpegEncContext *s = &r->s;
103 GetBitContext *gb = &s->gb;
104 int code = svq3_get_ue_golomb(gb);
105
106 if(code > 11){
107 av_log(s->avctx, AV_LOG_ERROR, "Incorrect MB type code\n");
108 return -1;
109 }
110 if(code > 5){
111 av_log(s->avctx, AV_LOG_ERROR, "dquant needed\n");
112 code -= 6;
113 }
114 if(s->pict_type != FF_B_TYPE)
115 return rv30_p_types[code];
116 else
117 return rv30_b_types[code];
118 }
119
120 static inline void rv30_weak_loop_filter(uint8_t *src, const int step,
121 const int stride, const int lim)
122 {
123 uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
124 int i, diff;
125
126 for(i = 0; i < 4; i++){
127 diff = ((src[-2*step] - src[1*step]) - (src[-1*step] - src[0*step])*4) >> 3;
128 diff = av_clip(diff, -lim, lim);
129 src[-1*step] = cm[src[-1*step] + diff];
130 src[ 0*step] = cm[src[ 0*step] - diff];
131 src += stride;
132 }
133 }
134
135 static void rv30_loop_filter(RV34DecContext *r, int row)
136 {
137 MpegEncContext *s = &r->s;
138 int mb_pos, mb_x;
139 int i, j, k;
140 uint8_t *Y, *C;
141 int loc_lim, cur_lim, left_lim = 0, top_lim = 0;
142
143 mb_pos = row * s->mb_stride;
144 for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
145 int mbtype = s->current_picture_ptr->mb_type[mb_pos];
146 if(IS_INTRA(mbtype) || IS_SEPARATE_DC(mbtype))
147 r->deblock_coefs[mb_pos] = 0xFFFF;
148 if(IS_INTRA(mbtype))
149 r->cbp_chroma[mb_pos] = 0xFF;
150 }
151
152 /* all vertical edges are filtered first
153 * and horizontal edges are filtered on the next iteration
154 */
155 mb_pos = row * s->mb_stride;
156 for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
157 cur_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos]];
158 if(mb_x)
159 left_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos - 1]];
160 for(j = 0; j < 16; j += 4){
161 Y = s->current_picture_ptr->data[0] + mb_x*16 + (row*16 + j) * s->linesize + 4 * !mb_x;
162 for(i = !mb_x; i < 4; i++, Y += 4){
163 int ij = i + j;
164 loc_lim = 0;
165 if(r->deblock_coefs[mb_pos] & (1 << ij))
166 loc_lim = cur_lim;
167 else if(!i && r->deblock_coefs[mb_pos - 1] & (1 << (ij + 3)))
168 loc_lim = left_lim;
169 else if( i && r->deblock_coefs[mb_pos] & (1 << (ij - 1)))
170 loc_lim = cur_lim;
171 if(loc_lim)
172 rv30_weak_loop_filter(Y, 1, s->linesize, loc_lim);
173 }
174 }
175 for(k = 0; k < 2; k++){
176 int cur_cbp, left_cbp = 0;
177 cur_cbp = (r->cbp_chroma[mb_pos] >> (k*4)) & 0xF;
178 if(mb_x)
179 left_cbp = (r->cbp_chroma[mb_pos - 1] >> (k*4)) & 0xF;
180 for(j = 0; j < 8; j += 4){
181 C = s->current_picture_ptr->data[k+1] + mb_x*8 + (row*8 + j) * s->uvlinesize + 4 * !mb_x;
182 for(i = !mb_x; i < 2; i++, C += 4){
183 int ij = i + (j >> 1);
184 loc_lim = 0;
185 if(cur_cbp && (1 << ij))
186 loc_lim = cur_lim;
187 else if(!i && left_cbp & (1 << (ij + 1)))
188 loc_lim = left_lim;
189 else if( i && cur_cbp & (1 << (ij - 1)))
190 loc_lim = cur_lim;
191 if(loc_lim)
192 rv30_weak_loop_filter(C, 1, s->uvlinesize, loc_lim);
193 }
194 }
195 }
196 }
197 mb_pos = row * s->mb_stride;
198 for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
199 cur_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos]];
200 if(row)
201 top_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos - s->mb_stride]];
202 for(j = 4*!row; j < 16; j += 4){
203 Y = s->current_picture_ptr->data[0] + mb_x*16 + (row*16 + j) * s->linesize;
204 for(i = 0; i < 4; i++, Y += 4){
205 int ij = i + j;
206 loc_lim = 0;
207 if(r->deblock_coefs[mb_pos] & (1 << ij))
208 loc_lim = cur_lim;
209 else if(!j && r->deblock_coefs[mb_pos - s->mb_stride] & (1 << (ij + 12)))
210 loc_lim = top_lim;
211 else if( j && r->deblock_coefs[mb_pos] & (1 << (ij - 4)))
212 loc_lim = cur_lim;
213 if(loc_lim)
214 rv30_weak_loop_filter(Y, s->linesize, 1, loc_lim);
215 }
216 }
217 for(k = 0; k < 2; k++){
218 int cur_cbp, top_cbp = 0;
219 cur_cbp = (r->cbp_chroma[mb_pos] >> (k*4)) & 0xF;
220 if(row)
221 top_cbp = (r->cbp_chroma[mb_pos - s->mb_stride] >> (k*4)) & 0xF;
222 for(j = 4*!row; j < 8; j += 4){
223 C = s->current_picture_ptr->data[k+1] + mb_x*8 + (row*8 + j) * s->uvlinesize;
224 for(i = 0; i < 2; i++, C += 4){
225 int ij = i + (j >> 1);
226 loc_lim = 0;
227 if(r->cbp_chroma[mb_pos] && (1 << ij))
228 loc_lim = cur_lim;
229 else if(!j && top_cbp & (1 << (ij + 2)))
230 loc_lim = top_lim;
231 else if( j && cur_cbp & (1 << (ij - 2)))
232 loc_lim = cur_lim;
233 if(loc_lim)
234 rv30_weak_loop_filter(C, s->uvlinesize, 1, loc_lim);
235 }
236 }
237 }
238 }
239 }
240
241 /**
242 * Initialize decoder.
243 */
244 static av_cold int rv30_decode_init(AVCodecContext *avctx)
245 {
246 RV34DecContext *r = avctx->priv_data;
247
248 r->rv30 = 1;
249 ff_rv34_decode_init(avctx);
250 if(avctx->extradata_size < 2){
251 av_log(avctx, AV_LOG_ERROR, "Extradata is too small.\n");
252 return -1;
253 }
254 r->rpr = (avctx->extradata[1] & 7) >> 1;
255 r->rpr = FFMIN(r->rpr + 1, 3);
256 if(avctx->extradata_size - 8 < (r->rpr - 1) * 2){
257 av_log(avctx, AV_LOG_ERROR, "Insufficient extradata - need at least %d bytes, got %d\n",
258 6 + r->rpr * 2, avctx->extradata_size);
259 }
260 r->parse_slice_header = rv30_parse_slice_header;
261 r->decode_intra_types = rv30_decode_intra_types;
262 r->decode_mb_info = rv30_decode_mb_info;
263 r->loop_filter = rv30_loop_filter;
264 r->luma_dc_quant_i = rv30_luma_dc_quant;
265 r->luma_dc_quant_p = rv30_luma_dc_quant;
266 return 0;
267 }
268
269 AVCodec ff_rv30_decoder = {
270 "rv30",
271 AVMEDIA_TYPE_VIDEO,
272 CODEC_ID_RV30,
273 sizeof(RV34DecContext),
274 rv30_decode_init,
275 NULL,
276 ff_rv34_decode_end,
277 ff_rv34_decode_frame,
278 CODEC_CAP_DR1 | CODEC_CAP_DELAY,
279 .flush = ff_mpeg_flush,
280 .long_name = NULL_IF_CONFIG_SMALL("RealVideo 3.0"),
281 .pix_fmts= ff_pixfmt_list_420,
282 };