185 lines
6.1 KiB
C
185 lines
6.1 KiB
C
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/*
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* H.263 internal header
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVCODEC_H263_H
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#define AVCODEC_H263_H
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#include <stdint.h>
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#include "libavutil/rational.h"
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#include "get_bits.h"
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#include "mpegvideo.h"
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#include "h263data.h"
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#include "rl.h"
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#define FF_ASPECT_EXTENDED 15
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#define INT_BIT (CHAR_BIT * sizeof(int))
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// The defines below define the number of bits that are read at once for
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// reading vlc values. Changing these may improve speed and data cache needs
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// be aware though that decreasing them may need the number of stages that is
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// passed to get_vlc* to be increased.
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#define INTRA_MCBPC_VLC_BITS 6
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#define INTER_MCBPC_VLC_BITS 7
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#define CBPY_VLC_BITS 6
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#define TEX_VLC_BITS 9
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#define H263_GOB_HEIGHT(h) ((h) <= 400 ? 1 : (h) <= 800 ? 2 : 4)
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extern VLC ff_h263_intra_MCBPC_vlc;
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extern VLC ff_h263_inter_MCBPC_vlc;
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extern VLC ff_h263_cbpy_vlc;
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extern const enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[];
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int ff_h263_decode_motion(MpegEncContext * s, int pred, int f_code);
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av_const int ff_h263_aspect_to_info(AVRational aspect);
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int ff_h263_decode_init(AVCodecContext *avctx);
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int ff_h263_decode_frame(AVCodecContext *avctx,
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void *data, int *got_frame,
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AVPacket *avpkt);
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int ff_h263_decode_end(AVCodecContext *avctx);
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void ff_h263_encode_mb(MpegEncContext *s,
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int16_t block[6][64],
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int motion_x, int motion_y);
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void ff_h263_encode_picture_header(MpegEncContext *s, int picture_number);
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void ff_h263_encode_gob_header(MpegEncContext * s, int mb_line);
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int16_t *ff_h263_pred_motion(MpegEncContext * s, int block, int dir,
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int *px, int *py);
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void ff_h263_encode_init(MpegEncContext *s);
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void ff_h263_decode_init_vlc(void);
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int ff_h263_decode_picture_header(MpegEncContext *s);
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int ff_h263_decode_gob_header(MpegEncContext *s);
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void ff_h263_update_motion_val(MpegEncContext * s);
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void ff_h263_loop_filter(MpegEncContext * s);
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int ff_h263_decode_mba(MpegEncContext *s);
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void ff_h263_encode_mba(MpegEncContext *s);
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void ff_init_qscale_tab(MpegEncContext *s);
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int ff_h263_pred_dc(MpegEncContext * s, int n, int16_t **dc_val_ptr);
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void ff_h263_pred_acdc(MpegEncContext * s, int16_t *block, int n);
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/**
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* Print picture info if FF_DEBUG_PICT_INFO is set.
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*/
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void ff_h263_show_pict_info(MpegEncContext *s);
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int ff_intel_h263_decode_picture_header(MpegEncContext *s);
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int ff_h263_decode_mb(MpegEncContext *s,
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int16_t block[6][64]);
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/**
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* Return the value of the 3-bit "source format" syntax element.
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* This represents some standard picture dimensions or indicates that
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* width&height are explicitly stored later.
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*/
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int av_const h263_get_picture_format(int width, int height);
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void ff_clean_h263_qscales(MpegEncContext *s);
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int ff_h263_resync(MpegEncContext *s);
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void ff_h263_encode_motion(PutBitContext *pb, int val, int f_code);
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static inline int h263_get_motion_length(int val, int f_code){
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int l, bit_size, code;
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if (val == 0) {
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return ff_mvtab[0][1];
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} else {
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bit_size = f_code - 1;
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/* modulo encoding */
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l= INT_BIT - 6 - bit_size;
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val = (val<<l)>>l;
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val--;
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code = (val >> bit_size) + 1;
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return ff_mvtab[code][1] + 1 + bit_size;
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}
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}
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static inline void ff_h263_encode_motion_vector(MpegEncContext * s, int x, int y, int f_code){
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if (s->avctx->flags2 & AV_CODEC_FLAG2_NO_OUTPUT) {
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skip_put_bits(&s->pb,
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h263_get_motion_length(x, f_code)
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+h263_get_motion_length(y, f_code));
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}else{
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ff_h263_encode_motion(&s->pb, x, f_code);
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ff_h263_encode_motion(&s->pb, y, f_code);
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}
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}
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static inline int get_p_cbp(MpegEncContext * s,
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int16_t block[6][64],
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int motion_x, int motion_y){
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int cbp, i;
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if (s->mpv_flags & FF_MPV_FLAG_CBP_RD) {
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int best_cbpy_score= INT_MAX;
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int best_cbpc_score= INT_MAX;
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int cbpc = (-1), cbpy= (-1);
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const int offset= (s->mv_type==MV_TYPE_16X16 ? 0 : 16) + (s->dquant ? 8 : 0);
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const int lambda= s->lambda2 >> (FF_LAMBDA_SHIFT - 6);
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for(i=0; i<4; i++){
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int score= ff_h263_inter_MCBPC_bits[i + offset] * lambda;
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if(i&1) score += s->coded_score[5];
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if(i&2) score += s->coded_score[4];
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if(score < best_cbpc_score){
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best_cbpc_score= score;
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cbpc= i;
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}
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}
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for(i=0; i<16; i++){
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int score= ff_h263_cbpy_tab[i ^ 0xF][1] * lambda;
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if(i&1) score += s->coded_score[3];
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if(i&2) score += s->coded_score[2];
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if(i&4) score += s->coded_score[1];
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if(i&8) score += s->coded_score[0];
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if(score < best_cbpy_score){
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best_cbpy_score= score;
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cbpy= i;
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}
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}
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cbp= cbpc + 4*cbpy;
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if ((motion_x | motion_y | s->dquant) == 0 && s->mv_type==MV_TYPE_16X16){
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if(best_cbpy_score + best_cbpc_score + 2*lambda >= 0)
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cbp= 0;
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}
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for (i = 0; i < 6; i++) {
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if (s->block_last_index[i] >= 0 && ((cbp >> (5 - i))&1)==0 ){
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s->block_last_index[i]= -1;
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s->bdsp.clear_block(s->block[i]);
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}
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}
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}else{
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cbp= 0;
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for (i = 0; i < 6; i++) {
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if (s->block_last_index[i] >= 0)
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cbp |= 1 << (5 - i);
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}
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}
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return cbp;
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}
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#endif /* AVCODEC_H263_H */
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