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
24 #include "libavutil/rational.h"
26 #include "mpegvideo.h"
29 #if !FF_API_ASPECT_EXTENDED
30 #define FF_ASPECT_EXTENDED 15
32 #define INT_BIT (CHAR_BIT * sizeof(int))
34 // The defines below define the number of bits that are read at once for
35 // reading vlc values. Changing these may improve speed and data cache needs
36 // be aware though that decreasing them may need the number of stages that is
37 // passed to get_vlc* to be increased.
38 #define INTRA_MCBPC_VLC_BITS 6
39 #define INTER_MCBPC_VLC_BITS 7
40 #define CBPY_VLC_BITS 6
41 #define TEX_VLC_BITS 9
43 #define H263_GOB_HEIGHT(h) ((h) <= 400 ? 1 : (h) <= 800 ? 2 : 4)
45 extern const AVRational ff_h263_pixel_aspect[16];
46 extern const uint8_t ff_h263_cbpy_tab[16][2];
48 extern const uint8_t ff_cbpc_b_tab[4][2];
50 extern const uint8_t ff_mvtab[33][2];
52 extern const uint8_t ff_h263_intra_MCBPC_code[9];
53 extern const uint8_t ff_h263_intra_MCBPC_bits[9];
55 extern const uint8_t ff_h263_inter_MCBPC_code[28];
56 extern const uint8_t ff_h263_inter_MCBPC_bits[28];
57 extern const uint8_t ff_h263_mbtype_b_tab[15][2];
59 extern VLC ff_h263_intra_MCBPC_vlc;
60 extern VLC ff_h263_inter_MCBPC_vlc;
61 extern VLC ff_h263_cbpy_vlc;
63 extern const uint16_t ff_inter_vlc[103][2];
64 extern const int8_t ff_inter_level[102];
65 extern const int8_t ff_inter_run[102];
67 extern RLTable ff_h263_rl_inter;
69 extern RLTable ff_rl_intra_aic;
71 extern const uint16_t ff_h263_format[8][2];
72 extern const uint8_t ff_modified_quant_tab[2][32];
73 extern const uint16_t ff_mba_max[6];
74 extern const uint8_t ff_mba_length[7];
76 extern uint8_t ff_h263_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
78 extern const enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[];
81 int ff_h263_decode_motion(MpegEncContext * s, int pred, int f_code);
82 av_const int ff_h263_aspect_to_info(AVRational aspect);
83 int ff_h263_decode_init(AVCodecContext *avctx);
84 int ff_h263_decode_frame(AVCodecContext *avctx,
85 void *data, int *got_frame,
87 int ff_h263_decode_end(AVCodecContext *avctx);
88 void ff_h263_encode_mb(MpegEncContext *s,
90 int motion_x, int motion_y);
91 void ff_h263_encode_picture_header(MpegEncContext *s, int picture_number);
92 void ff_h263_encode_gob_header(MpegEncContext * s, int mb_line);
93 int16_t *ff_h263_pred_motion(MpegEncContext * s, int block, int dir,
95 void ff_h263_encode_init(MpegEncContext *s);
96 void ff_h263_decode_init_vlc(void);
97 int ff_h263_decode_picture_header(MpegEncContext *s);
98 int ff_h263_decode_gob_header(MpegEncContext *s);
99 void ff_h263_update_motion_val(MpegEncContext * s);
100 void ff_h263_loop_filter(MpegEncContext * s);
101 int ff_h263_decode_mba(MpegEncContext *s);
102 void ff_h263_encode_mba(MpegEncContext *s);
103 void ff_init_qscale_tab(MpegEncContext *s);
104 int ff_h263_pred_dc(MpegEncContext * s, int n, int16_t **dc_val_ptr);
105 void ff_h263_pred_acdc(MpegEncContext * s, int16_t *block, int n);
109 * Print picture info if FF_DEBUG_PICT_INFO is set.
111 void ff_h263_show_pict_info(MpegEncContext *s);
113 int ff_intel_h263_decode_picture_header(MpegEncContext *s);
114 int ff_h263_decode_mb(MpegEncContext *s,
115 int16_t block[6][64]);
118 * Return the value of the 3bit "source format" syntax element.
119 * This represents some standard picture dimensions or indicates that
120 * width&height are explicitly stored later.
122 int av_const h263_get_picture_format(int width, int height);
124 void ff_clean_h263_qscales(MpegEncContext *s);
125 int ff_h263_resync(MpegEncContext *s);
126 void ff_h263_encode_motion(PutBitContext *pb, int val, int f_code);
129 static inline int h263_get_motion_length(int val, int f_code){
130 int l, bit_size, code;
133 return ff_mvtab[0][1];
135 bit_size = f_code - 1;
136 /* modulo encoding */
137 l= INT_BIT - 6 - bit_size;
140 code = (val >> bit_size) + 1;
142 return ff_mvtab[code][1] + 1 + bit_size;
146 static inline void ff_h263_encode_motion_vector(MpegEncContext * s, int x, int y, int f_code){
147 if (s->avctx->flags2 & CODEC_FLAG2_NO_OUTPUT) {
148 skip_put_bits(&s->pb,
149 h263_get_motion_length(x, f_code)
150 +h263_get_motion_length(y, f_code));
152 ff_h263_encode_motion(&s->pb, x, f_code);
153 ff_h263_encode_motion(&s->pb, y, f_code);
157 static inline int get_p_cbp(MpegEncContext * s,
158 int16_t block[6][64],
159 int motion_x, int motion_y){
162 if (s->mpv_flags & FF_MPV_FLAG_CBP_RD) {
163 int best_cbpy_score= INT_MAX;
164 int best_cbpc_score= INT_MAX;
165 int cbpc = (-1), cbpy= (-1);
166 const int offset= (s->mv_type==MV_TYPE_16X16 ? 0 : 16) + (s->dquant ? 8 : 0);
167 const int lambda= s->lambda2 >> (FF_LAMBDA_SHIFT - 6);
170 int score= ff_h263_inter_MCBPC_bits[i + offset] * lambda;
171 if(i&1) score += s->coded_score[5];
172 if(i&2) score += s->coded_score[4];
174 if(score < best_cbpc_score){
175 best_cbpc_score= score;
181 int score= ff_h263_cbpy_tab[i ^ 0xF][1] * lambda;
182 if(i&1) score += s->coded_score[3];
183 if(i&2) score += s->coded_score[2];
184 if(i&4) score += s->coded_score[1];
185 if(i&8) score += s->coded_score[0];
187 if(score < best_cbpy_score){
188 best_cbpy_score= score;
193 if ((motion_x | motion_y | s->dquant) == 0 && s->mv_type==MV_TYPE_16X16){
194 if(best_cbpy_score + best_cbpc_score + 2*lambda >= 0)
198 for (i = 0; i < 6; i++) {
199 if (s->block_last_index[i] >= 0 && ((cbp >> (5 - i))&1)==0 ){
200 s->block_last_index[i]= -1;
201 s->bdsp.clear_block(s->block[i]);
206 for (i = 0; i < 6; i++) {
207 if (s->block_last_index[i] >= 0)
214 #endif /* AVCODEC_H263_H */