mirror of
https://github.com/FFmpeg/FFmpeg.git
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87 lines
3.3 KiB
C
87 lines
3.3 KiB
C
/*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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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#include "get_bits.h"
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#include "golomb.h"
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#include "h264.h"
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#include "h264_parse.h"
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int ff_h264_pred_weight_table(GetBitContext *gb, const SPS *sps,
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const int *ref_count, int slice_type_nos,
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H264PredWeightTable *pwt)
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{
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int list, i;
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int luma_def, chroma_def;
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pwt->use_weight = 0;
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pwt->use_weight_chroma = 0;
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pwt->luma_log2_weight_denom = get_ue_golomb(gb);
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if (sps->chroma_format_idc)
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pwt->chroma_log2_weight_denom = get_ue_golomb(gb);
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luma_def = 1 << pwt->luma_log2_weight_denom;
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chroma_def = 1 << pwt->chroma_log2_weight_denom;
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for (list = 0; list < 2; list++) {
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pwt->luma_weight_flag[list] = 0;
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pwt->chroma_weight_flag[list] = 0;
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for (i = 0; i < ref_count[list]; i++) {
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int luma_weight_flag, chroma_weight_flag;
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luma_weight_flag = get_bits1(gb);
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if (luma_weight_flag) {
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pwt->luma_weight[i][list][0] = get_se_golomb(gb);
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pwt->luma_weight[i][list][1] = get_se_golomb(gb);
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if (pwt->luma_weight[i][list][0] != luma_def ||
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pwt->luma_weight[i][list][1] != 0) {
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pwt->use_weight = 1;
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pwt->luma_weight_flag[list] = 1;
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}
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} else {
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pwt->luma_weight[i][list][0] = luma_def;
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pwt->luma_weight[i][list][1] = 0;
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}
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if (sps->chroma_format_idc) {
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chroma_weight_flag = get_bits1(gb);
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if (chroma_weight_flag) {
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int j;
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for (j = 0; j < 2; j++) {
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pwt->chroma_weight[i][list][j][0] = get_se_golomb(gb);
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pwt->chroma_weight[i][list][j][1] = get_se_golomb(gb);
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if (pwt->chroma_weight[i][list][j][0] != chroma_def ||
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pwt->chroma_weight[i][list][j][1] != 0) {
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pwt->use_weight_chroma = 1;
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pwt->chroma_weight_flag[list] = 1;
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}
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}
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} else {
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int j;
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for (j = 0; j < 2; j++) {
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pwt->chroma_weight[i][list][j][0] = chroma_def;
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pwt->chroma_weight[i][list][j][1] = 0;
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}
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}
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}
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}
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if (slice_type_nos != AV_PICTURE_TYPE_B)
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break;
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}
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pwt->use_weight = pwt->use_weight || pwt->use_weight_chroma;
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return 0;
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}
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