2 * This file is part of FFmpeg.
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "h264_parse.h"
24 int ff_h264_pred_weight_table(GetBitContext *gb, const SPS *sps,
25 const int *ref_count, int slice_type_nos,
26 H264PredWeightTable *pwt)
29 int luma_def, chroma_def;
32 pwt->use_weight_chroma = 0;
33 pwt->luma_log2_weight_denom = get_ue_golomb(gb);
34 if (sps->chroma_format_idc)
35 pwt->chroma_log2_weight_denom = get_ue_golomb(gb);
37 if (pwt->luma_log2_weight_denom > 7U) {
38 av_log(NULL, AV_LOG_ERROR, "luma_log2_weight_denom %d is out of range\n", pwt->luma_log2_weight_denom);
39 pwt->luma_log2_weight_denom = 0;
41 if (pwt->chroma_log2_weight_denom > 7U) {
42 av_log(NULL, AV_LOG_ERROR, "chroma_log2_weight_denom %d is out of range\n", pwt->chroma_log2_weight_denom);
43 pwt->chroma_log2_weight_denom = 0;
46 luma_def = 1 << pwt->luma_log2_weight_denom;
47 chroma_def = 1 << pwt->chroma_log2_weight_denom;
49 for (list = 0; list < 2; list++) {
50 pwt->luma_weight_flag[list] = 0;
51 pwt->chroma_weight_flag[list] = 0;
52 for (i = 0; i < ref_count[list]; i++) {
53 int luma_weight_flag, chroma_weight_flag;
55 luma_weight_flag = get_bits1(gb);
56 if (luma_weight_flag) {
57 pwt->luma_weight[i][list][0] = get_se_golomb(gb);
58 pwt->luma_weight[i][list][1] = get_se_golomb(gb);
59 if (pwt->luma_weight[i][list][0] != luma_def ||
60 pwt->luma_weight[i][list][1] != 0) {
62 pwt->luma_weight_flag[list] = 1;
65 pwt->luma_weight[i][list][0] = luma_def;
66 pwt->luma_weight[i][list][1] = 0;
69 if (sps->chroma_format_idc) {
70 chroma_weight_flag = get_bits1(gb);
71 if (chroma_weight_flag) {
73 for (j = 0; j < 2; j++) {
74 pwt->chroma_weight[i][list][j][0] = get_se_golomb(gb);
75 pwt->chroma_weight[i][list][j][1] = get_se_golomb(gb);
76 if (pwt->chroma_weight[i][list][j][0] != chroma_def ||
77 pwt->chroma_weight[i][list][j][1] != 0) {
78 pwt->use_weight_chroma = 1;
79 pwt->chroma_weight_flag[list] = 1;
84 for (j = 0; j < 2; j++) {
85 pwt->chroma_weight[i][list][j][0] = chroma_def;
86 pwt->chroma_weight[i][list][j][1] = 0;
91 if (slice_type_nos != AV_PICTURE_TYPE_B)
94 pwt->use_weight = pwt->use_weight || pwt->use_weight_chroma;
99 * Check if the top & left blocks are available if needed and
100 * change the dc mode so it only uses the available blocks.
102 int ff_h264_check_intra4x4_pred_mode(int8_t *pred_mode_cache, void *logctx,
103 int top_samples_available, int left_samples_available)
105 static const int8_t top[12] = {
106 -1, 0, LEFT_DC_PRED, -1, -1, -1, -1, -1, 0
108 static const int8_t left[12] = {
109 0, -1, TOP_DC_PRED, 0, -1, -1, -1, 0, -1, DC_128_PRED
113 if (!(top_samples_available & 0x8000)) {
114 for (i = 0; i < 4; i++) {
115 int status = top[pred_mode_cache[scan8[0] + i]];
117 av_log(logctx, AV_LOG_ERROR,
118 "top block unavailable for requested intra mode %d\n",
120 return AVERROR_INVALIDDATA;
122 pred_mode_cache[scan8[0] + i] = status;
127 if ((left_samples_available & 0x8888) != 0x8888) {
128 static const int mask[4] = { 0x8000, 0x2000, 0x80, 0x20 };
129 for (i = 0; i < 4; i++)
130 if (!(left_samples_available & mask[i])) {
131 int status = left[pred_mode_cache[scan8[0] + 8 * i]];
133 av_log(logctx, AV_LOG_ERROR,
134 "left block unavailable for requested intra4x4 mode %d\n",
136 return AVERROR_INVALIDDATA;
138 pred_mode_cache[scan8[0] + 8 * i] = status;
147 * Check if the top & left blocks are available if needed and
148 * change the dc mode so it only uses the available blocks.
150 int ff_h264_check_intra_pred_mode(void *logctx, int top_samples_available,
151 int left_samples_available,
152 int mode, int is_chroma)
154 static const int8_t top[4] = { LEFT_DC_PRED8x8, 1, -1, -1 };
155 static const int8_t left[5] = { TOP_DC_PRED8x8, -1, 2, -1, DC_128_PRED8x8 };
158 av_log(logctx, AV_LOG_ERROR,
159 "out of range intra chroma pred mode\n");
160 return AVERROR_INVALIDDATA;
163 if (!(top_samples_available & 0x8000)) {
166 av_log(logctx, AV_LOG_ERROR,
167 "top block unavailable for requested intra mode\n");
168 return AVERROR_INVALIDDATA;
172 if ((left_samples_available & 0x8080) != 0x8080) {
175 av_log(logctx, AV_LOG_ERROR,
176 "left block unavailable for requested intra mode\n");
177 return AVERROR_INVALIDDATA;
179 if (is_chroma && (left_samples_available & 0x8080)) {
180 // mad cow disease mode, aka MBAFF + constrained_intra_pred
181 mode = ALZHEIMER_DC_L0T_PRED8x8 +
182 (!(left_samples_available & 0x8000)) +
183 2 * (mode == DC_128_PRED8x8);