3 * Copyright (c) 2000,2001 Fabrice Bellard
4 * Copyright (c) 2002-2004 Michael Niedermayer
6 * This file is part of Libav.
8 * Libav is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
13 * Libav is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with Libav; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
28 #include "libavutil/imgutils.h"
30 #include "error_resilience.h"
32 #include "mpegvideo.h"
33 #include "mpeg4video.h"
36 #define RV_GET_MAJOR_VER(x) ((x) >> 28)
37 #define RV_GET_MINOR_VER(x) (((x) >> 20) & 0xFF)
38 #define RV_GET_MICRO_VER(x) (((x) >> 12) & 0xFF)
40 #define DC_VLC_BITS 14 //FIXME find a better solution
42 typedef struct RVDecContext {
47 static const uint16_t rv_lum_code[256] = {
48 0x3e7f, 0x0f00, 0x0f01, 0x0f02, 0x0f03, 0x0f04, 0x0f05, 0x0f06,
49 0x0f07, 0x0f08, 0x0f09, 0x0f0a, 0x0f0b, 0x0f0c, 0x0f0d, 0x0f0e,
50 0x0f0f, 0x0f10, 0x0f11, 0x0f12, 0x0f13, 0x0f14, 0x0f15, 0x0f16,
51 0x0f17, 0x0f18, 0x0f19, 0x0f1a, 0x0f1b, 0x0f1c, 0x0f1d, 0x0f1e,
52 0x0f1f, 0x0f20, 0x0f21, 0x0f22, 0x0f23, 0x0f24, 0x0f25, 0x0f26,
53 0x0f27, 0x0f28, 0x0f29, 0x0f2a, 0x0f2b, 0x0f2c, 0x0f2d, 0x0f2e,
54 0x0f2f, 0x0f30, 0x0f31, 0x0f32, 0x0f33, 0x0f34, 0x0f35, 0x0f36,
55 0x0f37, 0x0f38, 0x0f39, 0x0f3a, 0x0f3b, 0x0f3c, 0x0f3d, 0x0f3e,
56 0x0f3f, 0x0380, 0x0381, 0x0382, 0x0383, 0x0384, 0x0385, 0x0386,
57 0x0387, 0x0388, 0x0389, 0x038a, 0x038b, 0x038c, 0x038d, 0x038e,
58 0x038f, 0x0390, 0x0391, 0x0392, 0x0393, 0x0394, 0x0395, 0x0396,
59 0x0397, 0x0398, 0x0399, 0x039a, 0x039b, 0x039c, 0x039d, 0x039e,
60 0x039f, 0x00c0, 0x00c1, 0x00c2, 0x00c3, 0x00c4, 0x00c5, 0x00c6,
61 0x00c7, 0x00c8, 0x00c9, 0x00ca, 0x00cb, 0x00cc, 0x00cd, 0x00ce,
62 0x00cf, 0x0050, 0x0051, 0x0052, 0x0053, 0x0054, 0x0055, 0x0056,
63 0x0057, 0x0020, 0x0021, 0x0022, 0x0023, 0x000c, 0x000d, 0x0004,
64 0x0000, 0x0005, 0x000e, 0x000f, 0x0024, 0x0025, 0x0026, 0x0027,
65 0x0058, 0x0059, 0x005a, 0x005b, 0x005c, 0x005d, 0x005e, 0x005f,
66 0x00d0, 0x00d1, 0x00d2, 0x00d3, 0x00d4, 0x00d5, 0x00d6, 0x00d7,
67 0x00d8, 0x00d9, 0x00da, 0x00db, 0x00dc, 0x00dd, 0x00de, 0x00df,
68 0x03a0, 0x03a1, 0x03a2, 0x03a3, 0x03a4, 0x03a5, 0x03a6, 0x03a7,
69 0x03a8, 0x03a9, 0x03aa, 0x03ab, 0x03ac, 0x03ad, 0x03ae, 0x03af,
70 0x03b0, 0x03b1, 0x03b2, 0x03b3, 0x03b4, 0x03b5, 0x03b6, 0x03b7,
71 0x03b8, 0x03b9, 0x03ba, 0x03bb, 0x03bc, 0x03bd, 0x03be, 0x03bf,
72 0x0f40, 0x0f41, 0x0f42, 0x0f43, 0x0f44, 0x0f45, 0x0f46, 0x0f47,
73 0x0f48, 0x0f49, 0x0f4a, 0x0f4b, 0x0f4c, 0x0f4d, 0x0f4e, 0x0f4f,
74 0x0f50, 0x0f51, 0x0f52, 0x0f53, 0x0f54, 0x0f55, 0x0f56, 0x0f57,
75 0x0f58, 0x0f59, 0x0f5a, 0x0f5b, 0x0f5c, 0x0f5d, 0x0f5e, 0x0f5f,
76 0x0f60, 0x0f61, 0x0f62, 0x0f63, 0x0f64, 0x0f65, 0x0f66, 0x0f67,
77 0x0f68, 0x0f69, 0x0f6a, 0x0f6b, 0x0f6c, 0x0f6d, 0x0f6e, 0x0f6f,
78 0x0f70, 0x0f71, 0x0f72, 0x0f73, 0x0f74, 0x0f75, 0x0f76, 0x0f77,
79 0x0f78, 0x0f79, 0x0f7a, 0x0f7b, 0x0f7c, 0x0f7d, 0x0f7e, 0x0f7f,
82 static const uint8_t rv_lum_bits[256] = {
83 14, 12, 12, 12, 12, 12, 12, 12,
84 12, 12, 12, 12, 12, 12, 12, 12,
85 12, 12, 12, 12, 12, 12, 12, 12,
86 12, 12, 12, 12, 12, 12, 12, 12,
87 12, 12, 12, 12, 12, 12, 12, 12,
88 12, 12, 12, 12, 12, 12, 12, 12,
89 12, 12, 12, 12, 12, 12, 12, 12,
90 12, 12, 12, 12, 12, 12, 12, 12,
91 12, 10, 10, 10, 10, 10, 10, 10,
92 10, 10, 10, 10, 10, 10, 10, 10,
93 10, 10, 10, 10, 10, 10, 10, 10,
94 10, 10, 10, 10, 10, 10, 10, 10,
95 10, 8, 8, 8, 8, 8, 8, 8,
96 8, 8, 8, 8, 8, 8, 8, 8,
97 8, 7, 7, 7, 7, 7, 7, 7,
98 7, 6, 6, 6, 6, 5, 5, 4,
99 2, 4, 5, 5, 6, 6, 6, 6,
100 7, 7, 7, 7, 7, 7, 7, 7,
101 8, 8, 8, 8, 8, 8, 8, 8,
102 8, 8, 8, 8, 8, 8, 8, 8,
103 10, 10, 10, 10, 10, 10, 10, 10,
104 10, 10, 10, 10, 10, 10, 10, 10,
105 10, 10, 10, 10, 10, 10, 10, 10,
106 10, 10, 10, 10, 10, 10, 10, 10,
107 12, 12, 12, 12, 12, 12, 12, 12,
108 12, 12, 12, 12, 12, 12, 12, 12,
109 12, 12, 12, 12, 12, 12, 12, 12,
110 12, 12, 12, 12, 12, 12, 12, 12,
111 12, 12, 12, 12, 12, 12, 12, 12,
112 12, 12, 12, 12, 12, 12, 12, 12,
113 12, 12, 12, 12, 12, 12, 12, 12,
114 12, 12, 12, 12, 12, 12, 12, 12,
117 static const uint16_t rv_chrom_code[256] = {
118 0xfe7f, 0x3f00, 0x3f01, 0x3f02, 0x3f03, 0x3f04, 0x3f05, 0x3f06,
119 0x3f07, 0x3f08, 0x3f09, 0x3f0a, 0x3f0b, 0x3f0c, 0x3f0d, 0x3f0e,
120 0x3f0f, 0x3f10, 0x3f11, 0x3f12, 0x3f13, 0x3f14, 0x3f15, 0x3f16,
121 0x3f17, 0x3f18, 0x3f19, 0x3f1a, 0x3f1b, 0x3f1c, 0x3f1d, 0x3f1e,
122 0x3f1f, 0x3f20, 0x3f21, 0x3f22, 0x3f23, 0x3f24, 0x3f25, 0x3f26,
123 0x3f27, 0x3f28, 0x3f29, 0x3f2a, 0x3f2b, 0x3f2c, 0x3f2d, 0x3f2e,
124 0x3f2f, 0x3f30, 0x3f31, 0x3f32, 0x3f33, 0x3f34, 0x3f35, 0x3f36,
125 0x3f37, 0x3f38, 0x3f39, 0x3f3a, 0x3f3b, 0x3f3c, 0x3f3d, 0x3f3e,
126 0x3f3f, 0x0f80, 0x0f81, 0x0f82, 0x0f83, 0x0f84, 0x0f85, 0x0f86,
127 0x0f87, 0x0f88, 0x0f89, 0x0f8a, 0x0f8b, 0x0f8c, 0x0f8d, 0x0f8e,
128 0x0f8f, 0x0f90, 0x0f91, 0x0f92, 0x0f93, 0x0f94, 0x0f95, 0x0f96,
129 0x0f97, 0x0f98, 0x0f99, 0x0f9a, 0x0f9b, 0x0f9c, 0x0f9d, 0x0f9e,
130 0x0f9f, 0x03c0, 0x03c1, 0x03c2, 0x03c3, 0x03c4, 0x03c5, 0x03c6,
131 0x03c7, 0x03c8, 0x03c9, 0x03ca, 0x03cb, 0x03cc, 0x03cd, 0x03ce,
132 0x03cf, 0x00e0, 0x00e1, 0x00e2, 0x00e3, 0x00e4, 0x00e5, 0x00e6,
133 0x00e7, 0x0030, 0x0031, 0x0032, 0x0033, 0x0008, 0x0009, 0x0002,
134 0x0000, 0x0003, 0x000a, 0x000b, 0x0034, 0x0035, 0x0036, 0x0037,
135 0x00e8, 0x00e9, 0x00ea, 0x00eb, 0x00ec, 0x00ed, 0x00ee, 0x00ef,
136 0x03d0, 0x03d1, 0x03d2, 0x03d3, 0x03d4, 0x03d5, 0x03d6, 0x03d7,
137 0x03d8, 0x03d9, 0x03da, 0x03db, 0x03dc, 0x03dd, 0x03de, 0x03df,
138 0x0fa0, 0x0fa1, 0x0fa2, 0x0fa3, 0x0fa4, 0x0fa5, 0x0fa6, 0x0fa7,
139 0x0fa8, 0x0fa9, 0x0faa, 0x0fab, 0x0fac, 0x0fad, 0x0fae, 0x0faf,
140 0x0fb0, 0x0fb1, 0x0fb2, 0x0fb3, 0x0fb4, 0x0fb5, 0x0fb6, 0x0fb7,
141 0x0fb8, 0x0fb9, 0x0fba, 0x0fbb, 0x0fbc, 0x0fbd, 0x0fbe, 0x0fbf,
142 0x3f40, 0x3f41, 0x3f42, 0x3f43, 0x3f44, 0x3f45, 0x3f46, 0x3f47,
143 0x3f48, 0x3f49, 0x3f4a, 0x3f4b, 0x3f4c, 0x3f4d, 0x3f4e, 0x3f4f,
144 0x3f50, 0x3f51, 0x3f52, 0x3f53, 0x3f54, 0x3f55, 0x3f56, 0x3f57,
145 0x3f58, 0x3f59, 0x3f5a, 0x3f5b, 0x3f5c, 0x3f5d, 0x3f5e, 0x3f5f,
146 0x3f60, 0x3f61, 0x3f62, 0x3f63, 0x3f64, 0x3f65, 0x3f66, 0x3f67,
147 0x3f68, 0x3f69, 0x3f6a, 0x3f6b, 0x3f6c, 0x3f6d, 0x3f6e, 0x3f6f,
148 0x3f70, 0x3f71, 0x3f72, 0x3f73, 0x3f74, 0x3f75, 0x3f76, 0x3f77,
149 0x3f78, 0x3f79, 0x3f7a, 0x3f7b, 0x3f7c, 0x3f7d, 0x3f7e, 0x3f7f,
152 static const uint8_t rv_chrom_bits[256] = {
153 16, 14, 14, 14, 14, 14, 14, 14,
154 14, 14, 14, 14, 14, 14, 14, 14,
155 14, 14, 14, 14, 14, 14, 14, 14,
156 14, 14, 14, 14, 14, 14, 14, 14,
157 14, 14, 14, 14, 14, 14, 14, 14,
158 14, 14, 14, 14, 14, 14, 14, 14,
159 14, 14, 14, 14, 14, 14, 14, 14,
160 14, 14, 14, 14, 14, 14, 14, 14,
161 14, 12, 12, 12, 12, 12, 12, 12,
162 12, 12, 12, 12, 12, 12, 12, 12,
163 12, 12, 12, 12, 12, 12, 12, 12,
164 12, 12, 12, 12, 12, 12, 12, 12,
165 12, 10, 10, 10, 10, 10, 10, 10,
166 10, 10, 10, 10, 10, 10, 10, 10,
167 10, 8, 8, 8, 8, 8, 8, 8,
168 8, 6, 6, 6, 6, 4, 4, 3,
169 2, 3, 4, 4, 6, 6, 6, 6,
170 8, 8, 8, 8, 8, 8, 8, 8,
171 10, 10, 10, 10, 10, 10, 10, 10,
172 10, 10, 10, 10, 10, 10, 10, 10,
173 12, 12, 12, 12, 12, 12, 12, 12,
174 12, 12, 12, 12, 12, 12, 12, 12,
175 12, 12, 12, 12, 12, 12, 12, 12,
176 12, 12, 12, 12, 12, 12, 12, 12,
177 14, 14, 14, 14, 14, 14, 14, 14,
178 14, 14, 14, 14, 14, 14, 14, 14,
179 14, 14, 14, 14, 14, 14, 14, 14,
180 14, 14, 14, 14, 14, 14, 14, 14,
181 14, 14, 14, 14, 14, 14, 14, 14,
182 14, 14, 14, 14, 14, 14, 14, 14,
183 14, 14, 14, 14, 14, 14, 14, 14,
184 14, 14, 14, 14, 14, 14, 14, 14,
187 static VLC rv_dc_lum, rv_dc_chrom;
189 int ff_rv_decode_dc(MpegEncContext *s, int n)
194 code = get_vlc2(&s->gb, rv_dc_lum.table, DC_VLC_BITS, 2);
196 /* XXX: I don't understand why they use LONGER codes than
197 necessary. The following code would be completely useless
198 if they had thought about it !!! */
199 code = get_bits(&s->gb, 7);
201 code = (int8_t)(get_bits(&s->gb, 7) + 1);
202 } else if (code == 0x7d) {
203 code = -128 + get_bits(&s->gb, 7);
204 } else if (code == 0x7e) {
205 if (get_bits1(&s->gb) == 0)
206 code = (int8_t)(get_bits(&s->gb, 8) + 1);
208 code = (int8_t)(get_bits(&s->gb, 8));
209 } else if (code == 0x7f) {
210 skip_bits(&s->gb, 11);
217 code = get_vlc2(&s->gb, rv_dc_chrom.table, DC_VLC_BITS, 2);
220 code = get_bits(&s->gb, 9);
222 code = (int8_t)(get_bits(&s->gb, 7) + 1);
223 } else if (code == 0x1fd) {
224 code = -128 + get_bits(&s->gb, 7);
225 } else if (code == 0x1fe) {
226 skip_bits(&s->gb, 9);
229 av_log(s->avctx, AV_LOG_ERROR, "chroma dc error\n");
239 /* read RV 1.0 compatible frame header */
240 static int rv10_decode_picture_header(MpegEncContext *s)
242 int mb_count, pb_frame, marker, mb_xy;
244 marker = get_bits1(&s->gb);
246 if (get_bits1(&s->gb))
247 s->pict_type = AV_PICTURE_TYPE_P;
249 s->pict_type = AV_PICTURE_TYPE_I;
252 av_log(s->avctx, AV_LOG_ERROR, "marker missing\n");
254 pb_frame = get_bits1(&s->gb);
256 av_dlog(s->avctx, "pict_type=%d pb_frame=%d\n", s->pict_type, pb_frame);
259 avpriv_request_sample(s->avctx, "pb frame");
260 return AVERROR_PATCHWELCOME;
263 s->qscale = get_bits(&s->gb, 5);
264 if (s->qscale == 0) {
265 av_log(s->avctx, AV_LOG_ERROR, "Invalid qscale value: 0\n");
266 return AVERROR_INVALIDDATA;
269 if (s->pict_type == AV_PICTURE_TYPE_I) {
270 if (s->rv10_version == 3) {
271 /* specific MPEG like DC coding not used */
272 s->last_dc[0] = get_bits(&s->gb, 8);
273 s->last_dc[1] = get_bits(&s->gb, 8);
274 s->last_dc[2] = get_bits(&s->gb, 8);
275 av_dlog(s->avctx, "DC:%d %d %d\n", s->last_dc[0],
276 s->last_dc[1], s->last_dc[2]);
279 /* if multiple packets per frame are sent, the position at which
280 to display the macroblocks is coded here */
282 mb_xy = s->mb_x + s->mb_y * s->mb_width;
283 if (show_bits(&s->gb, 12) == 0 || (mb_xy && mb_xy < s->mb_num)) {
284 s->mb_x = get_bits(&s->gb, 6); /* mb_x */
285 s->mb_y = get_bits(&s->gb, 6); /* mb_y */
286 mb_count = get_bits(&s->gb, 12);
290 mb_count = s->mb_width * s->mb_height;
292 skip_bits(&s->gb, 3); /* ignored */
294 s->unrestricted_mv = 1;
299 static int rv20_decode_picture_header(RVDecContext *rv)
301 MpegEncContext *s = &rv->m;
302 int seq, mb_pos, i, ret;
305 i = get_bits(&s->gb, 2);
307 case 0: s->pict_type = AV_PICTURE_TYPE_I; break;
308 case 1: s->pict_type = AV_PICTURE_TYPE_I; break; //hmm ...
309 case 2: s->pict_type = AV_PICTURE_TYPE_P; break;
310 case 3: s->pict_type = AV_PICTURE_TYPE_B; break;
312 av_log(s->avctx, AV_LOG_ERROR, "unknown frame type\n");
313 return AVERROR_INVALIDDATA;
316 if (s->last_picture_ptr == NULL && s->pict_type == AV_PICTURE_TYPE_B) {
317 av_log(s->avctx, AV_LOG_ERROR, "early B-frame\n");
318 return AVERROR_INVALIDDATA;
321 if (get_bits1(&s->gb)) {
322 av_log(s->avctx, AV_LOG_ERROR, "reserved bit set\n");
323 return AVERROR_INVALIDDATA;
326 s->qscale = get_bits(&s->gb, 5);
327 if (s->qscale == 0) {
328 av_log(s->avctx, AV_LOG_ERROR, "Invalid qscale value: 0\n");
329 return AVERROR_INVALIDDATA;
332 if (RV_GET_MINOR_VER(rv->sub_id) >= 2)
333 s->loop_filter = get_bits1(&s->gb);
335 if (RV_GET_MINOR_VER(rv->sub_id) <= 1)
336 seq = get_bits(&s->gb, 8) << 7;
338 seq = get_bits(&s->gb, 13) << 2;
340 rpr_bits = s->avctx->extradata[1] & 7;
343 rpr_bits = FFMIN((rpr_bits >> 1) + 1, 3);
345 f = get_bits(&s->gb, rpr_bits);
348 if (s->avctx->extradata_size < 8 + 2 * f) {
349 av_log(s->avctx, AV_LOG_ERROR, "Extradata too small.\n");
350 return AVERROR_INVALIDDATA;
353 new_w = 4 * ((uint8_t*)s->avctx->extradata)[6 + 2 * f];
354 new_h = 4 * ((uint8_t*)s->avctx->extradata)[7 + 2 * f];
356 new_w = s->orig_width ;
357 new_h = s->orig_height;
359 if (new_w != s->width || new_h != s->height) {
360 av_log(s->avctx, AV_LOG_DEBUG,
361 "attempting to change resolution to %dx%d\n", new_w, new_h);
362 ff_MPV_common_end(s);
364 ret = ff_set_dimensions(s->avctx, new_w, new_h);
370 if ((ret = ff_MPV_common_init(s)) < 0)
374 if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
375 av_log(s->avctx, AV_LOG_DEBUG, "F %d/%d\n", f, rpr_bits);
377 } else if (av_image_check_size(s->width, s->height, 0, s->avctx) < 0)
378 return AVERROR_INVALIDDATA;
380 mb_pos = ff_h263_decode_mba(s);
382 seq |= s->time & ~0x7FFF;
383 if (seq - s->time > 0x4000)
385 if (seq - s->time < -0x4000)
388 if (seq != s->time) {
389 if (s->pict_type != AV_PICTURE_TYPE_B) {
391 s->pp_time = s->time - s->last_non_b_time;
392 s->last_non_b_time = s->time;
395 s->pb_time = s->pp_time - (s->last_non_b_time - s->time);
396 if (s->pp_time <= s->pb_time ||
397 s->pp_time <= s->pp_time - s->pb_time || s->pp_time <= 0) {
398 av_log(s->avctx, AV_LOG_DEBUG, "messed up order, possible "
399 "from seeking? skipping current b frame\n");
400 return FRAME_SKIPPED;
402 ff_mpeg4_init_direct_mv(s);
406 s->no_rounding = get_bits1(&s->gb);
408 if (RV_GET_MINOR_VER(rv->sub_id) <= 1 && s->pict_type == AV_PICTURE_TYPE_B)
409 skip_bits(&s->gb, 5); // binary decoder reads 3+2 bits here but they don't seem to be used
412 s->unrestricted_mv = 1;
413 s->h263_aic = s->pict_type == AV_PICTURE_TYPE_I;
414 s->modified_quant = 1;
417 if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
418 av_log(s->avctx, AV_LOG_INFO, "num:%5d x:%2d y:%2d type:%d qscale:%2d rnd:%d\n",
419 seq, s->mb_x, s->mb_y, s->pict_type, s->qscale, s->no_rounding);
422 assert(s->pict_type != AV_PICTURE_TYPE_B || !s->low_delay);
424 return s->mb_width*s->mb_height - mb_pos;
427 static av_cold int rv10_decode_init(AVCodecContext *avctx)
429 RVDecContext *rv = avctx->priv_data;
430 MpegEncContext *s = &rv->m;
432 int major_ver, minor_ver, micro_ver, ret;
434 if (avctx->extradata_size < 8) {
435 av_log(avctx, AV_LOG_ERROR, "Extradata is too small.\n");
436 return AVERROR_INVALIDDATA;
438 if ((ret = av_image_check_size(avctx->coded_width,
439 avctx->coded_height, 0, avctx)) < 0)
442 ff_MPV_decode_defaults(s);
445 s->out_format = FMT_H263;
446 s->codec_id = avctx->codec_id;
447 avctx->flags |= CODEC_FLAG_EMU_EDGE;
449 s->orig_width = s->width = avctx->coded_width;
450 s->orig_height = s->height = avctx->coded_height;
452 s->h263_long_vectors = ((uint8_t*)avctx->extradata)[3] & 1;
453 rv->sub_id = AV_RB32((uint8_t*)avctx->extradata + 4);
455 major_ver = RV_GET_MAJOR_VER(rv->sub_id);
456 minor_ver = RV_GET_MINOR_VER(rv->sub_id);
457 micro_ver = RV_GET_MICRO_VER(rv->sub_id);
462 s->rv10_version = micro_ver ? 3 : 1;
463 s->obmc = micro_ver == 2;
466 if (minor_ver >= 2) {
468 s->avctx->has_b_frames = 1;
472 av_log(s->avctx, AV_LOG_ERROR, "unknown header %X\n", rv->sub_id);
473 avpriv_request_sample(avctx, "RV1/2 version");
474 return AVERROR_PATCHWELCOME;
477 if (avctx->debug & FF_DEBUG_PICT_INFO) {
478 av_log(avctx, AV_LOG_DEBUG, "ver:%X ver0:%X\n", rv->sub_id,
479 avctx->extradata_size >= 4 ? ((uint32_t*)avctx->extradata)[0] : -1);
482 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
484 if ((ret = ff_MPV_common_init(s)) < 0)
487 ff_h263dsp_init(&s->h263dsp);
488 ff_h263_decode_init_vlc();
492 INIT_VLC_STATIC(&rv_dc_lum, DC_VLC_BITS, 256,
494 rv_lum_code, 2, 2, 16384);
495 INIT_VLC_STATIC(&rv_dc_chrom, DC_VLC_BITS, 256,
497 rv_chrom_code, 2, 2, 16388);
504 static av_cold int rv10_decode_end(AVCodecContext *avctx)
506 MpegEncContext *s = avctx->priv_data;
508 ff_MPV_common_end(s);
512 static int rv10_decode_packet(AVCodecContext *avctx,
513 const uint8_t *buf, int buf_size, int buf_size2)
515 RVDecContext *rv = avctx->priv_data;
516 MpegEncContext *s = &rv->m;
517 int mb_count, mb_pos, left, start_mb_x, active_bits_size, ret;
519 active_bits_size = buf_size * 8;
520 init_get_bits(&s->gb, buf, FFMAX(buf_size, buf_size2) * 8);
521 if (s->codec_id == AV_CODEC_ID_RV10)
522 mb_count = rv10_decode_picture_header(s);
524 mb_count = rv20_decode_picture_header(rv);
526 av_log(s->avctx, AV_LOG_ERROR, "HEADER ERROR\n");
527 return AVERROR_INVALIDDATA;
530 if (s->mb_x >= s->mb_width ||
531 s->mb_y >= s->mb_height) {
532 av_log(s->avctx, AV_LOG_ERROR, "POS ERROR %d %d\n", s->mb_x, s->mb_y);
533 return AVERROR_INVALIDDATA;
535 mb_pos = s->mb_y * s->mb_width + s->mb_x;
536 left = s->mb_width * s->mb_height - mb_pos;
537 if (mb_count > left) {
538 av_log(s->avctx, AV_LOG_ERROR, "COUNT ERROR\n");
539 return AVERROR_INVALIDDATA;
542 if ((s->mb_x == 0 && s->mb_y == 0) || s->current_picture_ptr == NULL) {
543 if (s->current_picture_ptr) { // FIXME write parser so we always have complete frames?
544 ff_er_frame_end(&s->er);
546 s->mb_x = s->mb_y = s->resync_mb_x = s->resync_mb_y = 0;
548 if ((ret = ff_MPV_frame_start(s, avctx)) < 0)
550 ff_mpeg_er_frame_start(s);
552 if (s->current_picture_ptr->f.pict_type != s->pict_type) {
553 av_log(s->avctx, AV_LOG_ERROR, "Slice type mismatch\n");
554 return AVERROR_INVALIDDATA;
558 av_dlog(avctx, "qscale=%d\n", s->qscale);
560 /* default quantization values */
561 if (s->codec_id == AV_CODEC_ID_RV10) {
563 s->first_slice_line = 1;
565 s->first_slice_line = 1;
566 s->resync_mb_x = s->mb_x;
568 start_mb_x = s->mb_x;
569 s->resync_mb_y = s->mb_y;
571 s->y_dc_scale_table = s->c_dc_scale_table = ff_aic_dc_scale_table;
573 s->y_dc_scale_table = s->c_dc_scale_table = ff_mpeg1_dc_scale_table;
576 if (s->modified_quant)
577 s->chroma_qscale_table = ff_h263_chroma_qscale_table;
579 ff_set_qscale(s, s->qscale);
581 s->rv10_first_dc_coded[0] = 0;
582 s->rv10_first_dc_coded[1] = 0;
583 s->rv10_first_dc_coded[2] = 0;
587 s->block_wrap[3] = s->b8_stride;
589 s->block_wrap[5] = s->mb_stride;
590 ff_init_block_index(s);
592 /* decode each macroblock */
593 for (s->mb_num_left = mb_count; s->mb_num_left > 0; s->mb_num_left--) {
595 ff_update_block_index(s);
596 av_dlog(avctx, "**mb x=%d y=%d\n", s->mb_x, s->mb_y);
598 s->mv_dir = MV_DIR_FORWARD;
599 s->mv_type = MV_TYPE_16X16;
600 ret = ff_h263_decode_mb(s, s->block);
602 // Repeat the slice end check from ff_h263_decode_mb with our active
604 if (ret != SLICE_ERROR) {
605 int v = show_bits(&s->gb, 16);
607 if (get_bits_count(&s->gb) + 16 > active_bits_size)
608 v >>= get_bits_count(&s->gb) + 16 - active_bits_size;
613 if (ret != SLICE_ERROR && active_bits_size < get_bits_count(&s->gb) &&
614 8 * buf_size2 >= get_bits_count(&s->gb)) {
615 active_bits_size = buf_size2 * 8;
616 av_log(avctx, AV_LOG_DEBUG, "update size from %d to %d\n",
617 8 * buf_size, active_bits_size);
621 if (ret == SLICE_ERROR || active_bits_size < get_bits_count(&s->gb)) {
622 av_log(s->avctx, AV_LOG_ERROR, "ERROR at MB %d %d\n", s->mb_x, s->mb_y);
623 return AVERROR_INVALIDDATA;
625 if (s->pict_type != AV_PICTURE_TYPE_B)
626 ff_h263_update_motion_val(s);
627 ff_MPV_decode_mb(s, s->block);
629 ff_h263_loop_filter(s);
631 if (++s->mb_x == s->mb_width) {
634 ff_init_block_index(s);
636 if (s->mb_x == s->resync_mb_x)
637 s->first_slice_line = 0;
638 if (ret == SLICE_END)
642 ff_er_add_slice(&s->er, start_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y,
645 return active_bits_size;
648 static int get_slice_offset(AVCodecContext *avctx, const uint8_t *buf, int n)
650 if (avctx->slice_count)
651 return avctx->slice_offset[n];
653 return AV_RL32(buf + n * 8);
656 static int rv10_decode_frame(AVCodecContext *avctx,
657 void *data, int *got_frame,
660 const uint8_t *buf = avpkt->data;
661 int buf_size = avpkt->size;
662 MpegEncContext *s = avctx->priv_data;
663 AVFrame *pict = data;
666 const uint8_t *slices_hdr = NULL;
668 av_dlog(avctx, "*****frame %d size=%d\n", avctx->frame_number, buf_size);
670 /* no supplementary picture */
675 if (!avctx->slice_count) {
676 slice_count = (*buf++) + 1;
679 if (!slice_count || buf_size <= 8 * slice_count) {
680 av_log(avctx, AV_LOG_ERROR, "Invalid slice count: %d.\n", slice_count);
681 return AVERROR_INVALIDDATA;
684 slices_hdr = buf + 4;
685 buf += 8 * slice_count;
686 buf_size -= 8 * slice_count;
688 slice_count = avctx->slice_count;
690 for (i = 0; i < slice_count; i++) {
691 unsigned offset = get_slice_offset(avctx, slices_hdr, i);
694 if (offset >= buf_size)
695 return AVERROR_INVALIDDATA;
697 if (i + 1 == slice_count)
698 size = buf_size - offset;
700 size = get_slice_offset(avctx, slices_hdr, i + 1) - offset;
702 if (i + 2 >= slice_count)
703 size2 = buf_size - offset;
705 size2 = get_slice_offset(avctx, slices_hdr, i + 2) - offset;
707 if (size <= 0 || size2 <= 0 ||
708 offset + FFMAX(size, size2) > buf_size)
709 return AVERROR_INVALIDDATA;
711 if (rv10_decode_packet(avctx, buf + offset, size, size2) > 8 * size)
715 if (s->current_picture_ptr != NULL && s->mb_y >= s->mb_height) {
716 ff_er_frame_end(&s->er);
719 if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
720 if ((ret = av_frame_ref(pict, &s->current_picture_ptr->f)) < 0)
722 ff_print_debug_info(s, s->current_picture_ptr);
723 } else if (s->last_picture_ptr != NULL) {
724 if ((ret = av_frame_ref(pict, &s->last_picture_ptr->f)) < 0)
726 ff_print_debug_info(s, s->last_picture_ptr);
729 if (s->last_picture_ptr || s->low_delay) {
733 // so we can detect if frame_end was not called (find some nicer solution...)
734 s->current_picture_ptr = NULL;
740 AVCodec ff_rv10_decoder = {
742 .long_name = NULL_IF_CONFIG_SMALL("RealVideo 1.0"),
743 .type = AVMEDIA_TYPE_VIDEO,
744 .id = AV_CODEC_ID_RV10,
745 .priv_data_size = sizeof(RVDecContext),
746 .init = rv10_decode_init,
747 .close = rv10_decode_end,
748 .decode = rv10_decode_frame,
749 .capabilities = CODEC_CAP_DR1,
750 .pix_fmts = ff_pixfmt_list_420,
753 AVCodec ff_rv20_decoder = {
755 .long_name = NULL_IF_CONFIG_SMALL("RealVideo 2.0"),
756 .type = AVMEDIA_TYPE_VIDEO,
757 .id = AV_CODEC_ID_RV20,
758 .priv_data_size = sizeof(RVDecContext),
759 .init = rv10_decode_init,
760 .close = rv10_decode_end,
761 .decode = rv10_decode_frame,
762 .capabilities = CODEC_CAP_DR1 | CODEC_CAP_DELAY,
763 .flush = ff_mpeg_flush,
764 .pix_fmts = ff_pixfmt_list_420,