4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 #ifndef AVCODEC_H263_H
21 #define AVCODEC_H263_H
23 // The defines below define the number of bits that are read at once for
24 // reading vlc values. Changing these may improve speed and data cache needs
25 // be aware though that decreasing them may need the number of stages that is
26 // passed to get_vlc* to be increased.
27 #define INTRA_MCBPC_VLC_BITS 6
28 #define INTER_MCBPC_VLC_BITS 7
29 #define CBPY_VLC_BITS 6
30 #define TEX_VLC_BITS 9
32 extern const AVRational ff_h263_pixel_aspect[16];
33 extern const uint8_t ff_h263_cbpy_tab[16][2];
35 extern const uint8_t cbpc_b_tab[4][2];
37 extern const uint8_t mvtab[33][2];
39 extern const uint8_t ff_h263_intra_MCBPC_code[9];
40 extern const uint8_t ff_h263_intra_MCBPC_bits[9];
42 extern const uint8_t ff_h263_inter_MCBPC_code[28];
43 extern const uint8_t ff_h263_inter_MCBPC_bits[28];
44 extern const uint8_t h263_mbtype_b_tab[15][2];
46 extern VLC ff_h263_intra_MCBPC_vlc;
47 extern VLC ff_h263_inter_MCBPC_vlc;
48 extern VLC ff_h263_cbpy_vlc;
50 extern RLTable ff_h263_rl_inter;
52 extern RLTable rl_intra_aic;
54 extern const uint16_t h263_format[8][2];
55 extern const uint8_t modified_quant_tab[2][32];
56 extern uint16_t ff_mba_max[6];
57 extern uint8_t ff_mba_length[7];
59 extern uint8_t ff_h263_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
62 int h263_decode_motion(MpegEncContext * s, int pred, int f_code);
63 av_const int ff_h263_aspect_to_info(AVRational aspect);
64 int ff_h263_decode_init(AVCodecContext *avctx);
65 int ff_h263_decode_frame(AVCodecContext *avctx,
66 void *data, int *data_size,
68 int ff_h263_decode_end(AVCodecContext *avctx);
69 void h263_encode_mb(MpegEncContext *s,
71 int motion_x, int motion_y);
72 void h263_encode_picture_header(MpegEncContext *s, int picture_number);
73 void h263_encode_gob_header(MpegEncContext * s, int mb_line);
74 int16_t *h263_pred_motion(MpegEncContext * s, int block, int dir,
76 void h263_encode_init(MpegEncContext *s);
77 void h263_decode_init_vlc(MpegEncContext *s);
78 int h263_decode_picture_header(MpegEncContext *s);
79 int ff_h263_decode_gob_header(MpegEncContext *s);
80 void ff_h263_update_motion_val(MpegEncContext * s);
81 void ff_h263_loop_filter(MpegEncContext * s);
82 void ff_set_qscale(MpegEncContext * s, int qscale);
83 int ff_h263_decode_mba(MpegEncContext *s);
84 void ff_h263_encode_mba(MpegEncContext *s);
85 void ff_init_qscale_tab(MpegEncContext *s);
86 int h263_pred_dc(MpegEncContext * s, int n, int16_t **dc_val_ptr);
87 void h263_pred_acdc(MpegEncContext * s, DCTELEM *block, int n);
91 * Prints picture info if FF_DEBUG_PICT_INFO is set.
93 void ff_h263_show_pict_info(MpegEncContext *s);
95 int ff_intel_h263_decode_picture_header(MpegEncContext *s);
96 int ff_h263_decode_mb(MpegEncContext *s,
97 DCTELEM block[6][64]);
100 * Returns the value of the 3bit "source format" syntax element.
101 * that represents some standard picture dimensions or indicates that
102 * width&height are explicitly stored later.
104 int av_const h263_get_picture_format(int width, int height);
106 void ff_clean_h263_qscales(MpegEncContext *s);
107 int ff_h263_resync(MpegEncContext *s);
108 const uint8_t *ff_h263_find_resync_marker(const uint8_t *p, const uint8_t *end);
109 int ff_h263_get_gob_height(MpegEncContext *s);
110 void ff_h263_encode_motion(MpegEncContext * s, int val, int f_code);
113 static inline int h263_get_motion_length(MpegEncContext * s, int val, int f_code){
114 int l, bit_size, code;
119 bit_size = f_code - 1;
120 /* modulo encoding */
121 l= INT_BIT - 6 - bit_size;
124 code = (val >> bit_size) + 1;
126 return mvtab[code][1] + 1 + bit_size;
130 static inline void ff_h263_encode_motion_vector(MpegEncContext * s, int x, int y, int f_code){
131 if(s->flags2 & CODEC_FLAG2_NO_OUTPUT){
132 skip_put_bits(&s->pb,
133 h263_get_motion_length(s, x, f_code)
134 +h263_get_motion_length(s, y, f_code));
136 ff_h263_encode_motion(s, x, f_code);
137 ff_h263_encode_motion(s, y, f_code);
141 static inline int get_p_cbp(MpegEncContext * s,
142 DCTELEM block[6][64],
143 int motion_x, int motion_y){
146 if(s->flags & CODEC_FLAG_CBP_RD){
147 int best_cbpy_score= INT_MAX;
148 int best_cbpc_score= INT_MAX;
149 int cbpc = (-1), cbpy= (-1);
150 const int offset= (s->mv_type==MV_TYPE_16X16 ? 0 : 16) + (s->dquant ? 8 : 0);
151 const int lambda= s->lambda2 >> (FF_LAMBDA_SHIFT - 6);
154 int score= ff_h263_inter_MCBPC_bits[i + offset] * lambda;
155 if(i&1) score += s->coded_score[5];
156 if(i&2) score += s->coded_score[4];
158 if(score < best_cbpc_score){
159 best_cbpc_score= score;
165 int score= ff_h263_cbpy_tab[i ^ 0xF][1] * lambda;
166 if(i&1) score += s->coded_score[3];
167 if(i&2) score += s->coded_score[2];
168 if(i&4) score += s->coded_score[1];
169 if(i&8) score += s->coded_score[0];
171 if(score < best_cbpy_score){
172 best_cbpy_score= score;
177 if ((motion_x | motion_y | s->dquant) == 0 && s->mv_type==MV_TYPE_16X16){
178 if(best_cbpy_score + best_cbpc_score + 2*lambda >= 0)
182 for (i = 0; i < 6; i++) {
183 if (s->block_last_index[i] >= 0 && ((cbp >> (5 - i))&1)==0 ){
184 s->block_last_index[i]= -1;
185 s->dsp.clear_block(s->block[i]);
190 for (i = 0; i < 6; i++) {
191 if (s->block_last_index[i] >= 0)
198 static inline int get_b_cbp(MpegEncContext * s, DCTELEM block[6][64],
199 int motion_x, int motion_y, int mb_type){
202 if(s->flags & CODEC_FLAG_CBP_RD){
204 const int lambda= s->lambda2 >> (FF_LAMBDA_SHIFT - 6);
207 if(s->coded_score[i] < 0){
208 score += s->coded_score[i];
215 if ((motion_x | motion_y | s->dquant | mb_type) == 0){
216 zero_score-= 4; //2*MV + mb_type + cbp bit
220 if(zero_score <= score){
225 for (i = 0; i < 6; i++) {
226 if (s->block_last_index[i] >= 0 && ((cbp >> (5 - i))&1)==0 ){
227 s->block_last_index[i]= -1;
228 s->dsp.clear_block(s->block[i]);
232 for (i = 0; i < 6; i++) {
233 if (s->block_last_index[i] >= 0)
240 static inline void memsetw(short *tab, int val, int n)