GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/h263.h Lines: 12 53 22.6 %
Date: 2021-04-20 15:25:36 Branches: 6 46 13.0 %

Line Branch Exec Source
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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 H263_MV_VLC_BITS     9
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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 VLC ff_h263_mv_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 */