mirror of
https://github.com/FFmpeg/FFmpeg.git
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131 lines
4.2 KiB
C
131 lines
4.2 KiB
C
/*
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* H.263 encoder 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_H263ENC_H
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#define AVCODEC_H263ENC_H
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#include <stdint.h>
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#include "h263data.h"
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#include "mpegvideoenc.h"
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void ff_h263_encode_init(MpegEncContext *s);
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void ff_h263_encode_picture_header(MpegEncContext *s);
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void ff_h263_encode_gob_header(MpegEncContext * s, int mb_line);
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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_mba(MpegEncContext *s);
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void ff_init_qscale_tab(MpegEncContext *s);
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void ff_clean_h263_qscales(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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{
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int bit_size, code, sign;
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if (val == 0) {
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return 1; /* 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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val = sign_extend(val, 6 + bit_size);
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sign = val >> 31;
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val = (val ^ sign) - sign; /* val = FFABS(val) */
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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,
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int x, int y, int f_code)
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{
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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;
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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 (int 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 (int 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) && 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 (int i = 0; i < 6; i++) {
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if (s->block_last_index[i] >= 0 && !((cbp >> (5 - i)) & 1)) {
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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 (int 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
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