1/*
2 * MPEG4 encoder/decoder internal header.
3 * Copyright (c) 2000,2001 Fabrice Bellard
4 * Copyright (c) 2002-2010 Michael Niedermayer <michaelni@gmx.at>
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg 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 * FFmpeg 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 FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23#ifndef AVCODEC_MPEG4VIDEO_H
24#define AVCODEC_MPEG4VIDEO_H
25
26#include <stdint.h>
27#include "get_bits.h"
28#include "mpegvideo.h"
29#include "rl.h"
30
31// shapes
32#define RECT_SHAPE       0
33#define BIN_SHAPE        1
34#define BIN_ONLY_SHAPE   2
35#define GRAY_SHAPE       3
36
37#define SIMPLE_VO_TYPE             1
38#define CORE_VO_TYPE               3
39#define MAIN_VO_TYPE               4
40#define NBIT_VO_TYPE               5
41#define ARTS_VO_TYPE               10
42#define ACE_VO_TYPE                12
43#define ADV_SIMPLE_VO_TYPE         17
44
45// aspect_ratio_info
46#define EXTENDED_PAR 15
47
48//vol_sprite_usage / sprite_enable
49#define STATIC_SPRITE 1
50#define GMC_SPRITE 2
51
52#define MOTION_MARKER 0x1F001
53#define DC_MARKER     0x6B001
54
55#define VOS_STARTCODE        0x1B0
56#define USER_DATA_STARTCODE  0x1B2
57#define GOP_STARTCODE        0x1B3
58#define VISUAL_OBJ_STARTCODE 0x1B5
59#define VOP_STARTCODE        0x1B6
60
61/* dc encoding for mpeg4 */
62extern const uint8_t ff_mpeg4_DCtab_lum[13][2];
63extern const uint8_t ff_mpeg4_DCtab_chrom[13][2];
64
65extern const uint16_t ff_mpeg4_intra_vlc[103][2];
66extern RLTable ff_mpeg4_rl_intra;
67
68/* Note this is identical to the intra rvlc except that it is reordered. */
69extern const uint16_t inter_rvlc[170][2];
70extern RLTable rvlc_rl_inter;
71
72extern const uint16_t intra_rvlc[170][2];
73extern RLTable rvlc_rl_intra;
74
75extern const uint16_t sprite_trajectory_tab[15][2];
76extern const uint8_t mb_type_b_tab[4][2];
77
78/* these matrixes will be permuted for the idct */
79extern const int16_t ff_mpeg4_default_intra_matrix[64];
80extern const int16_t ff_mpeg4_default_non_intra_matrix[64];
81
82extern const uint8_t ff_mpeg4_y_dc_scale_table[32];
83extern const uint8_t ff_mpeg4_c_dc_scale_table[32];
84extern const uint16_t ff_mpeg4_resync_prefix[8];
85
86extern const uint8_t mpeg4_dc_threshold[8];
87
88void mpeg4_encode_mb(MpegEncContext *s,
89                    DCTELEM block[6][64],
90                    int motion_x, int motion_y);
91void mpeg4_pred_ac(MpegEncContext * s, DCTELEM *block, int n,
92                   int dir);
93void ff_set_mpeg4_time(MpegEncContext * s);
94void mpeg4_encode_picture_header(MpegEncContext *s, int picture_number);
95
96int ff_mpeg4_decode_picture_header(MpegEncContext * s, GetBitContext *gb);
97void ff_mpeg4_encode_video_packet_header(MpegEncContext *s);
98void ff_mpeg4_clean_buffers(MpegEncContext *s);
99void ff_mpeg4_stuffing(PutBitContext * pbc);
100void ff_mpeg4_init_partitions(MpegEncContext *s);
101void ff_mpeg4_merge_partitions(MpegEncContext *s);
102void ff_clean_mpeg4_qscales(MpegEncContext *s);
103int ff_mpeg4_decode_partitions(MpegEncContext *s);
104int ff_mpeg4_get_video_packet_prefix_length(MpegEncContext *s);
105int mpeg4_decode_video_packet_header(MpegEncContext *s);
106void ff_mpeg4_init_direct_mv(MpegEncContext *s);
107
108/**
109 *
110 * @return the mb_type
111 */
112int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my);
113
114extern uint8_t ff_mpeg4_static_rl_table_store[3][2][2*MAX_RUN + MAX_LEVEL + 3];
115
116
117#if 0 //3IV1 is quite rare and it slows things down a tiny bit
118#define IS_3IV1 s->codec_tag == AV_RL32("3IV1")
119#else
120#define IS_3IV1 0
121#endif
122
123
124/**
125 * predicts the dc.
126 * encoding quantized level -> quantized diff
127 * decoding quantized diff -> quantized level
128 * @param n block index (0-3 are luma, 4-5 are chroma)
129 * @param dir_ptr pointer to an integer where the prediction direction will be stored
130 */
131static inline int ff_mpeg4_pred_dc(MpegEncContext * s, int n, int level, int *dir_ptr, int encoding)
132{
133    int a, b, c, wrap, pred, scale, ret;
134    int16_t *dc_val;
135
136    /* find prediction */
137    if (n < 4) {
138        scale = s->y_dc_scale;
139    } else {
140        scale = s->c_dc_scale;
141    }
142    if(IS_3IV1)
143        scale= 8;
144
145    wrap= s->block_wrap[n];
146    dc_val = s->dc_val[0] + s->block_index[n];
147
148    /* B C
149     * A X
150     */
151    a = dc_val[ - 1];
152    b = dc_val[ - 1 - wrap];
153    c = dc_val[ - wrap];
154
155    /* outside slice handling (we can't do that by memset as we need the dc for error resilience) */
156    if(s->first_slice_line && n!=3){
157        if(n!=2) b=c= 1024;
158        if(n!=1 && s->mb_x == s->resync_mb_x) b=a= 1024;
159    }
160    if(s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y+1){
161        if(n==0 || n==4 || n==5)
162            b=1024;
163    }
164
165    if (abs(a - b) < abs(b - c)) {
166        pred = c;
167        *dir_ptr = 1; /* top */
168    } else {
169        pred = a;
170        *dir_ptr = 0; /* left */
171    }
172    /* we assume pred is positive */
173    pred = FASTDIV((pred + (scale >> 1)), scale);
174
175    if(encoding){
176        ret = level - pred;
177    }else{
178        level += pred;
179        ret= level;
180        if(s->error_recognition>=3){
181            if(level<0){
182                av_log(s->avctx, AV_LOG_ERROR, "dc<0 at %dx%d\n", s->mb_x, s->mb_y);
183                return -1;
184            }
185            if(level*scale > 2048 + scale){
186                av_log(s->avctx, AV_LOG_ERROR, "dc overflow at %dx%d\n", s->mb_x, s->mb_y);
187                return -1;
188            }
189        }
190    }
191    level *=scale;
192    if(level&(~2047)){
193        if(level<0)
194            level=0;
195        else if(!(s->workaround_bugs&FF_BUG_DC_CLIP))
196            level=2047;
197    }
198    dc_val[0]= level;
199
200    return ret;
201}
202#endif
203