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/*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "get_bits.h"
#include "golomb.h"
#include "h264.h"
#include "h264_parse.h"
int ff_h264_pred_weight_table(GetBitContext *gb, const SPS *sps,
const int *ref_count, int slice_type_nos,
H264PredWeightTable *pwt)
{
int list, i;
int luma_def, chroma_def;
pwt->use_weight = 0;
pwt->use_weight_chroma = 0;
pwt->luma_log2_weight_denom = get_ue_golomb(gb);
if (sps->chroma_format_idc)
pwt->chroma_log2_weight_denom = get_ue_golomb(gb);
luma_def = 1 << pwt->luma_log2_weight_denom;
chroma_def = 1 << pwt->chroma_log2_weight_denom;
for (list = 0; list < 2; list++) {
pwt->luma_weight_flag[list] = 0;
pwt->chroma_weight_flag[list] = 0;
for (i = 0; i < ref_count[list]; i++) {
int luma_weight_flag, chroma_weight_flag;
luma_weight_flag = get_bits1(gb);
if (luma_weight_flag) {
pwt->luma_weight[i][list][0] = get_se_golomb(gb);
pwt->luma_weight[i][list][1] = get_se_golomb(gb);
if (pwt->luma_weight[i][list][0] != luma_def ||
pwt->luma_weight[i][list][1] != 0) {
pwt->use_weight = 1;
pwt->luma_weight_flag[list] = 1;
}
} else {
pwt->luma_weight[i][list][0] = luma_def;
pwt->luma_weight[i][list][1] = 0;
}
if (sps->chroma_format_idc) {
chroma_weight_flag = get_bits1(gb);
if (chroma_weight_flag) {
int j;
for (j = 0; j < 2; j++) {
pwt->chroma_weight[i][list][j][0] = get_se_golomb(gb);
pwt->chroma_weight[i][list][j][1] = get_se_golomb(gb);
if (pwt->chroma_weight[i][list][j][0] != chroma_def ||
pwt->chroma_weight[i][list][j][1] != 0) {
pwt->use_weight_chroma = 1;
pwt->chroma_weight_flag[list] = 1;
}
}
} else {
int j;
for (j = 0; j < 2; j++) {
pwt->chroma_weight[i][list][j][0] = chroma_def;
pwt->chroma_weight[i][list][j][1] = 0;
}
}
}
}
if (slice_type_nos != AV_PICTURE_TYPE_B)
break;
}
pwt->use_weight = pwt->use_weight || pwt->use_weight_chroma;
return 0;
}
/**
* Check if the top & left blocks are available if needed and
* change the dc mode so it only uses the available blocks.
*/
int ff_h264_check_intra4x4_pred_mode(int8_t *pred_mode_cache, void *logctx,
int top_samples_available, int left_samples_available)
{
static const int8_t top[12] = {
-1, 0, LEFT_DC_PRED, -1, -1, -1, -1, -1, 0
};
static const int8_t left[12] = {
0, -1, TOP_DC_PRED, 0, -1, -1, -1, 0, -1, DC_128_PRED
};
int i;
if (!(top_samples_available & 0x8000)) {
for (i = 0; i < 4; i++) {
int status = top[pred_mode_cache[scan8[0] + i]];
if (status < 0) {
av_log(logctx, AV_LOG_ERROR,
"top block unavailable for requested intra4x4 mode %d\n",
status);
return AVERROR_INVALIDDATA;
} else if (status) {
pred_mode_cache[scan8[0] + i] = status;
}
}
}
if ((left_samples_available & 0x8888) != 0x8888) {
static const int mask[4] = { 0x8000, 0x2000, 0x80, 0x20 };
for (i = 0; i < 4; i++)
if (!(left_samples_available & mask[i])) {
int status = left[pred_mode_cache[scan8[0] + 8 * i]];
if (status < 0) {
av_log(logctx, AV_LOG_ERROR,
"left block unavailable for requested intra4x4 mode %d\n",
status);
return AVERROR_INVALIDDATA;
} else if (status) {
pred_mode_cache[scan8[0] + 8 * i] = status;
}
}
}
return 0;
}
/**
* Check if the top & left blocks are available if needed and
* change the dc mode so it only uses the available blocks.
*/
int ff_h264_check_intra_pred_mode(void *logctx, int top_samples_available,
int left_samples_available,
int mode, int is_chroma)
{
static const int8_t top[4] = { LEFT_DC_PRED8x8, 1, -1, -1 };
static const int8_t left[5] = { TOP_DC_PRED8x8, -1, 2, -1, DC_128_PRED8x8 };
if (mode > 3U) {
av_log(logctx, AV_LOG_ERROR,
"out of range intra chroma pred mode\n");
return AVERROR_INVALIDDATA;
}
if (!(top_samples_available & 0x8000)) {
mode = top[mode];
if (mode < 0) {
av_log(logctx, AV_LOG_ERROR,
"top block unavailable for requested intra mode\n");
return AVERROR_INVALIDDATA;
}
}
if ((left_samples_available & 0x8080) != 0x8080) {
mode = left[mode];
if (is_chroma && (left_samples_available & 0x8080)) {
// mad cow disease mode, aka MBAFF + constrained_intra_pred
mode = ALZHEIMER_DC_L0T_PRED8x8 +
(!(left_samples_available & 0x8000)) +
2 * (mode == DC_128_PRED8x8);
}
if (mode < 0) {
av_log(logctx, AV_LOG_ERROR,
"left block unavailable for requested intra mode\n");
return AVERROR_INVALIDDATA;
}
}
return mode;
}
int ff_h264_parse_ref_count(int *plist_count, int ref_count[2],
GetBitContext *gb, const PPS *pps,
int slice_type_nos, int picture_structure)
{
int list_count;
int num_ref_idx_active_override_flag, max_refs;
// set defaults, might be overridden a few lines later
ref_count[0] = pps->ref_count[0];
ref_count[1] = pps->ref_count[1];
if (slice_type_nos != AV_PICTURE_TYPE_I) {
num_ref_idx_active_override_flag = get_bits1(gb);
if (num_ref_idx_active_override_flag) {
ref_count[0] = get_ue_golomb(gb) + 1;
if (ref_count[0] < 1)
goto fail;
if (slice_type_nos == AV_PICTURE_TYPE_B) {
ref_count[1] = get_ue_golomb(gb) + 1;
if (ref_count[1] < 1)
goto fail;
}
}
if (slice_type_nos == AV_PICTURE_TYPE_B)
list_count = 2;
else
list_count = 1;
} else {
list_count = 0;
ref_count[0] = ref_count[1] = 0;
}
max_refs = picture_structure == PICT_FRAME ? 16 : 32;
if (ref_count[0] > max_refs || ref_count[1] > max_refs)
goto fail;
*plist_count = list_count;
return 0;
fail:
*plist_count = 0;
ref_count[0] = 0;
ref_count[1] = 0;
return AVERROR_INVALIDDATA;
}
int ff_h264_init_poc(int pic_field_poc[2], int *pic_poc,
const SPS *sps, H264POCContext *pc,
int picture_structure, int nal_ref_idc)
{
const int max_frame_num = 1 << sps->log2_max_frame_num;
int field_poc[2];
pc->frame_num_offset = pc->prev_frame_num_offset;
if (pc->frame_num < pc->prev_frame_num)
pc->frame_num_offset += max_frame_num;
if (sps->poc_type == 0) {
const int max_poc_lsb = 1 << sps->log2_max_poc_lsb;
if (pc->poc_lsb < pc->prev_poc_lsb &&
pc->prev_poc_lsb - pc->poc_lsb >= max_poc_lsb / 2)
pc->poc_msb = pc->prev_poc_msb + max_poc_lsb;
else if (pc->poc_lsb > pc->prev_poc_lsb &&
pc->prev_poc_lsb - pc->poc_lsb < -max_poc_lsb / 2)
pc->poc_msb = pc->prev_poc_msb - max_poc_lsb;
else
pc->poc_msb = pc->prev_poc_msb;
field_poc[0] =
field_poc[1] = pc->poc_msb + pc->poc_lsb;
if (picture_structure == PICT_FRAME)
field_poc[1] += pc->delta_poc_bottom;
} else if (sps->poc_type == 1) {
int abs_frame_num, expected_delta_per_poc_cycle, expectedpoc;
int i;
if (sps->poc_cycle_length != 0)
abs_frame_num = pc->frame_num_offset + pc->frame_num;
else
abs_frame_num = 0;
if (nal_ref_idc == 0 && abs_frame_num > 0)
abs_frame_num--;
expected_delta_per_poc_cycle = 0;
for (i = 0; i < sps->poc_cycle_length; i++)
// FIXME integrate during sps parse
expected_delta_per_poc_cycle += sps->offset_for_ref_frame[i];
if (abs_frame_num > 0) {
int poc_cycle_cnt = (abs_frame_num - 1) / sps->poc_cycle_length;
int frame_num_in_poc_cycle = (abs_frame_num - 1) % sps->poc_cycle_length;
expectedpoc = poc_cycle_cnt * expected_delta_per_poc_cycle;
for (i = 0; i <= frame_num_in_poc_cycle; i++)
expectedpoc = expectedpoc + sps->offset_for_ref_frame[i];
} else
expectedpoc = 0;
if (nal_ref_idc == 0)
expectedpoc = expectedpoc + sps->offset_for_non_ref_pic;
field_poc[0] = expectedpoc + pc->delta_poc[0];
field_poc[1] = field_poc[0] + sps->offset_for_top_to_bottom_field;
if (picture_structure == PICT_FRAME)
field_poc[1] += pc->delta_poc[1];
} else {
int poc = 2 * (pc->frame_num_offset + pc->frame_num);
if (!nal_ref_idc)
poc--;
field_poc[0] = poc;
field_poc[1] = poc;
}
if (picture_structure != PICT_BOTTOM_FIELD)
pic_field_poc[0] = field_poc[0];
if (picture_structure != PICT_TOP_FIELD)
pic_field_poc[1] = field_poc[1];
*pic_poc = FFMIN(pic_field_poc[0], pic_field_poc[1]);
return 0;
}
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