mpegvideo: Move tables to a separate file
[libav.git] / libavcodec / mpeg12.c
1 /*
2 * MPEG-1/2 decoder
3 * Copyright (c) 2000, 2001 Fabrice Bellard
4 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
5 *
6 * This file is part of Libav.
7 *
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.
12 *
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.
17 *
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
21 */
22
23 /**
24 * @file
25 * MPEG-1/2 decoder
26 */
27
28 #include "libavutil/attributes.h"
29 #include "internal.h"
30 #include "avcodec.h"
31 #include "mpegvideo.h"
32 #include "error_resilience.h"
33 #include "mpeg12.h"
34 #include "mpeg12data.h"
35 #include "mpegvideodata.h"
36 #include "bytestream.h"
37 #include "thread.h"
38
39 uint8_t ff_mpeg12_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
40
41 static const uint8_t table_mb_ptype[7][2] = {
42 { 3, 5 }, // 0x01 MB_INTRA
43 { 1, 2 }, // 0x02 MB_PAT
44 { 1, 3 }, // 0x08 MB_FOR
45 { 1, 1 }, // 0x0A MB_FOR|MB_PAT
46 { 1, 6 }, // 0x11 MB_QUANT|MB_INTRA
47 { 1, 5 }, // 0x12 MB_QUANT|MB_PAT
48 { 2, 5 }, // 0x1A MB_QUANT|MB_FOR|MB_PAT
49 };
50
51 static const uint8_t table_mb_btype[11][2] = {
52 { 3, 5 }, // 0x01 MB_INTRA
53 { 2, 3 }, // 0x04 MB_BACK
54 { 3, 3 }, // 0x06 MB_BACK|MB_PAT
55 { 2, 4 }, // 0x08 MB_FOR
56 { 3, 4 }, // 0x0A MB_FOR|MB_PAT
57 { 2, 2 }, // 0x0C MB_FOR|MB_BACK
58 { 3, 2 }, // 0x0E MB_FOR|MB_BACK|MB_PAT
59 { 1, 6 }, // 0x11 MB_QUANT|MB_INTRA
60 { 2, 6 }, // 0x16 MB_QUANT|MB_BACK|MB_PAT
61 { 3, 6 }, // 0x1A MB_QUANT|MB_FOR|MB_PAT
62 { 2, 5 }, // 0x1E MB_QUANT|MB_FOR|MB_BACK|MB_PAT
63 };
64
65 #define INIT_2D_VLC_RL(rl, static_size)\
66 {\
67 static RL_VLC_ELEM rl_vlc_table[static_size];\
68 INIT_VLC_STATIC(&rl.vlc, TEX_VLC_BITS, rl.n + 2,\
69 &rl.table_vlc[0][1], 4, 2,\
70 &rl.table_vlc[0][0], 4, 2, static_size);\
71 \
72 rl.rl_vlc[0] = rl_vlc_table;\
73 init_2d_vlc_rl(&rl);\
74 }
75
76 static av_cold void init_2d_vlc_rl(RLTable *rl)
77 {
78 int i;
79
80 for (i = 0; i < rl->vlc.table_size; i++) {
81 int code = rl->vlc.table[i][0];
82 int len = rl->vlc.table[i][1];
83 int level, run;
84
85 if (len == 0) { // illegal code
86 run = 65;
87 level = MAX_LEVEL;
88 } else if (len<0) { //more bits needed
89 run = 0;
90 level = code;
91 } else {
92 if (code == rl->n) { //esc
93 run = 65;
94 level = 0;
95 } else if (code == rl->n+1) { //eob
96 run = 0;
97 level = 127;
98 } else {
99 run = rl->table_run [code] + 1;
100 level = rl->table_level[code];
101 }
102 }
103 rl->rl_vlc[0][i].len = len;
104 rl->rl_vlc[0][i].level = level;
105 rl->rl_vlc[0][i].run = run;
106 }
107 }
108
109 av_cold void ff_mpeg12_common_init(MpegEncContext *s)
110 {
111
112 s->y_dc_scale_table =
113 s->c_dc_scale_table = ff_mpeg2_dc_scale_table[s->intra_dc_precision];
114
115 }
116
117 void ff_mpeg1_clean_buffers(MpegEncContext *s)
118 {
119 s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
120 s->last_dc[1] = s->last_dc[0];
121 s->last_dc[2] = s->last_dc[0];
122 memset(s->last_mv, 0, sizeof(s->last_mv));
123 }
124
125
126 /******************************************/
127 /* decoding */
128
129 VLC ff_mv_vlc;
130
131 VLC ff_dc_lum_vlc;
132 VLC ff_dc_chroma_vlc;
133
134 VLC ff_mbincr_vlc;
135 VLC ff_mb_ptype_vlc;
136 VLC ff_mb_btype_vlc;
137 VLC ff_mb_pat_vlc;
138
139 av_cold void ff_mpeg12_init_vlcs(void)
140 {
141 static int done = 0;
142
143 if (!done) {
144 done = 1;
145
146 INIT_VLC_STATIC(&ff_dc_lum_vlc, DC_VLC_BITS, 12,
147 ff_mpeg12_vlc_dc_lum_bits, 1, 1,
148 ff_mpeg12_vlc_dc_lum_code, 2, 2, 512);
149 INIT_VLC_STATIC(&ff_dc_chroma_vlc, DC_VLC_BITS, 12,
150 ff_mpeg12_vlc_dc_chroma_bits, 1, 1,
151 ff_mpeg12_vlc_dc_chroma_code, 2, 2, 514);
152 INIT_VLC_STATIC(&ff_mv_vlc, MV_VLC_BITS, 17,
153 &ff_mpeg12_mbMotionVectorTable[0][1], 2, 1,
154 &ff_mpeg12_mbMotionVectorTable[0][0], 2, 1, 518);
155 INIT_VLC_STATIC(&ff_mbincr_vlc, MBINCR_VLC_BITS, 36,
156 &ff_mpeg12_mbAddrIncrTable[0][1], 2, 1,
157 &ff_mpeg12_mbAddrIncrTable[0][0], 2, 1, 538);
158 INIT_VLC_STATIC(&ff_mb_pat_vlc, MB_PAT_VLC_BITS, 64,
159 &ff_mpeg12_mbPatTable[0][1], 2, 1,
160 &ff_mpeg12_mbPatTable[0][0], 2, 1, 512);
161
162 INIT_VLC_STATIC(&ff_mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
163 &table_mb_ptype[0][1], 2, 1,
164 &table_mb_ptype[0][0], 2, 1, 64);
165 INIT_VLC_STATIC(&ff_mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
166 &table_mb_btype[0][1], 2, 1,
167 &table_mb_btype[0][0], 2, 1, 64);
168 ff_rl_init(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
169 ff_rl_init(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
170
171 INIT_2D_VLC_RL(ff_rl_mpeg1, 680);
172 INIT_2D_VLC_RL(ff_rl_mpeg2, 674);
173 }
174 }
175
176 /**
177 * Find the end of the current frame in the bitstream.
178 * @return the position of the first byte of the next frame, or -1
179 */
180 int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size, AVCodecParserContext *s)
181 {
182 int i;
183 uint32_t state = pc->state;
184
185 /* EOF considered as end of frame */
186 if (buf_size == 0)
187 return 0;
188
189 /*
190 0 frame start -> 1/4
191 1 first_SEQEXT -> 0/2
192 2 first field start -> 3/0
193 3 second_SEQEXT -> 2/0
194 4 searching end
195 */
196
197 for (i = 0; i < buf_size; i++) {
198 assert(pc->frame_start_found >= 0 && pc->frame_start_found <= 4);
199 if (pc->frame_start_found & 1) {
200 if (state == EXT_START_CODE && (buf[i] & 0xF0) != 0x80)
201 pc->frame_start_found--;
202 else if (state == EXT_START_CODE + 2) {
203 if ((buf[i] & 3) == 3)
204 pc->frame_start_found = 0;
205 else
206 pc->frame_start_found = (pc->frame_start_found + 1) & 3;
207 }
208 state++;
209 } else {
210 i = avpriv_find_start_code(buf + i, buf + buf_size, &state) - buf - 1;
211 if (pc->frame_start_found == 0 && state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE) {
212 i++;
213 pc->frame_start_found = 4;
214 }
215 if (state == SEQ_END_CODE) {
216 pc->frame_start_found = 0;
217 pc->state=-1;
218 return i+1;
219 }
220 if (pc->frame_start_found == 2 && state == SEQ_START_CODE)
221 pc->frame_start_found = 0;
222 if (pc->frame_start_found < 4 && state == EXT_START_CODE)
223 pc->frame_start_found++;
224 if (pc->frame_start_found == 4 && (state & 0xFFFFFF00) == 0x100) {
225 if (state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE) {
226 pc->frame_start_found = 0;
227 pc->state = -1;
228 return i - 3;
229 }
230 }
231 if (pc->frame_start_found == 0 && s && state == PICTURE_START_CODE) {
232 ff_fetch_timestamp(s, i - 3, 1);
233 }
234 }
235 }
236 pc->state = state;
237 return END_NOT_FOUND;
238 }