mirror of https://git.ffmpeg.org/ffmpeg.git
189 lines
6.8 KiB
C
189 lines
6.8 KiB
C
/*
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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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#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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if (pwt->luma_log2_weight_denom > 7U) {
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av_log(NULL, AV_LOG_ERROR, "luma_log2_weight_denom %d is out of range\n", pwt->luma_log2_weight_denom);
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pwt->luma_log2_weight_denom = 0;
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}
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if (pwt->chroma_log2_weight_denom > 7U) {
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av_log(NULL, AV_LOG_ERROR, "chroma_log2_weight_denom %d is out of range\n", pwt->chroma_log2_weight_denom);
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pwt->chroma_log2_weight_denom = 0;
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}
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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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/**
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* Check if the top & left blocks are available if needed and
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* change the dc mode so it only uses the available blocks.
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*/
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int ff_h264_check_intra4x4_pred_mode(int8_t *pred_mode_cache, void *logctx,
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int top_samples_available, int left_samples_available)
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{
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static const int8_t top[12] = {
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-1, 0, LEFT_DC_PRED, -1, -1, -1, -1, -1, 0
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};
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static const int8_t left[12] = {
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0, -1, TOP_DC_PRED, 0, -1, -1, -1, 0, -1, DC_128_PRED
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};
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int i;
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if (!(top_samples_available & 0x8000)) {
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for (i = 0; i < 4; i++) {
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int status = top[pred_mode_cache[scan8[0] + i]];
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if (status < 0) {
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av_log(logctx, AV_LOG_ERROR,
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"top block unavailable for requested intra mode %d\n",
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status);
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return AVERROR_INVALIDDATA;
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} else if (status) {
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pred_mode_cache[scan8[0] + i] = status;
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}
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}
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}
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if ((left_samples_available & 0x8888) != 0x8888) {
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static const int mask[4] = { 0x8000, 0x2000, 0x80, 0x20 };
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for (i = 0; i < 4; i++)
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if (!(left_samples_available & mask[i])) {
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int status = left[pred_mode_cache[scan8[0] + 8 * i]];
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if (status < 0) {
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av_log(logctx, AV_LOG_ERROR,
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"left block unavailable for requested intra4x4 mode %d\n",
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status);
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return AVERROR_INVALIDDATA;
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} else if (status) {
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pred_mode_cache[scan8[0] + 8 * i] = status;
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}
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}
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}
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return 0;
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}
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/**
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* Check if the top & left blocks are available if needed and
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* change the dc mode so it only uses the available blocks.
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*/
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int ff_h264_check_intra_pred_mode(void *logctx, int top_samples_available,
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int left_samples_available,
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int mode, int is_chroma)
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{
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static const int8_t top[4] = { LEFT_DC_PRED8x8, 1, -1, -1 };
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static const int8_t left[5] = { TOP_DC_PRED8x8, -1, 2, -1, DC_128_PRED8x8 };
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if (mode > 3U) {
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av_log(logctx, AV_LOG_ERROR,
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"out of range intra chroma pred mode\n");
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return AVERROR_INVALIDDATA;
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}
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if (!(top_samples_available & 0x8000)) {
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mode = top[mode];
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if (mode < 0) {
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av_log(logctx, AV_LOG_ERROR,
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"top block unavailable for requested intra mode\n");
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return AVERROR_INVALIDDATA;
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}
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}
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if ((left_samples_available & 0x8080) != 0x8080) {
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mode = left[mode];
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if (mode < 0) {
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av_log(logctx, AV_LOG_ERROR,
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"left block unavailable for requested intra mode\n");
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return AVERROR_INVALIDDATA;
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}
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if (is_chroma && (left_samples_available & 0x8080)) {
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// mad cow disease mode, aka MBAFF + constrained_intra_pred
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mode = ALZHEIMER_DC_L0T_PRED8x8 +
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(!(left_samples_available & 0x8000)) +
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2 * (mode == DC_128_PRED8x8);
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}
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}
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return mode;
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}
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