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115 lines
3.6 KiB
C
115 lines
3.6 KiB
C
/*****************************************************************************
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* This file is part of Kvazaar HEVC encoder.
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*
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* Copyright (C) 2013-2014 Tampere University of Technology and others (see
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* COPYING file).
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*
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* Kvazaar is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*
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* Kvazaar 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Kvazaar. If not, see <http://www.gnu.org/licenses/>.
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****************************************************************************/
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/*
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* \file
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*/
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#include "nal.h"
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#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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#include "config.h"
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#include "bitstream.h"
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#include "cabac.h"
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#include "encoder.h"
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/**
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* \brief Write a Network Abstraction Layer (NAL) packet to the output.
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*/
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void nal_write(bitstream * const bitstream, const uint8_t nal_type,
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const uint8_t temporal_id, const int long_start_code)
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{
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uint8_t byte;
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// Some useful constants
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const uint8_t start_code_prefix_one_3bytes = 0x01;
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const uint8_t zero = 0x00;
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// zero_byte (0x00) shall be present in the byte stream NALU of VPS, SPS
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// and PPS, or the first NALU of an access unit
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if(long_start_code)
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bitstream_writebyte(bitstream, zero);
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// start_code_prefix_one_3bytes
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bitstream_writebyte(bitstream, zero);
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bitstream_writebyte(bitstream, zero);
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bitstream_writebyte(bitstream, start_code_prefix_one_3bytes);
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// Handle header bits with full bytes instead of using bitstream
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// forbidden_zero_flag(1) + nal_unit_type(6) + 1bit of nuh_layer_id
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byte = nal_type << 1;
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bitstream_writebyte(bitstream, byte);
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// 5bits of nuh_layer_id + nuh_temporal_id_plus1(3)
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byte = (temporal_id + 1) & 7;
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bitstream_writebyte(bitstream, byte);
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}
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/**
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* \brief Calculate checksum for one color of the picture.
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* \param data Beginning of the pixel data for the picture.
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* \param height Height of the picture.
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* \param width Width of the picture.
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* \param stride Width of one row in the pixel array.
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*/
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static void array_checksum(const pixel* data,
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const int height, const int width,
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const int stride,
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unsigned char checksum_out[SEI_HASH_MAX_LENGTH])
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{
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uint8_t mask;
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uint32_t checksum = 0;
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int y, x;
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assert(SEI_HASH_MAX_LENGTH >= 4);
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for (y = 0; y < height; ++y) {
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for (x = 0; x < width; ++x) {
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mask = (uint8_t)((x & 0xff) ^ (y & 0xff) ^ (x >> 8) ^ (y >> 8));
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checksum += (data[(y * stride) + x] & 0xff) ^ mask;
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}
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}
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// Unpack uint into byte-array.
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checksum_out[0] = (checksum >> 24) & 0xff;
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checksum_out[1] = (checksum >> 16) & 0xff;
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checksum_out[2] = (checksum >> 8) & 0xff;
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checksum_out[3] = (checksum) & 0xff;
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}
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/*!
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\brief Calculate checksums for all colors of the picture.
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\param pic The picture that checksum is calculated for.
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\param checksum_out Result of the calculation.
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\returns Void
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*/
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void picture_checksum(const picture* pic, unsigned char checksum_out[][SEI_HASH_MAX_LENGTH])
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{
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array_checksum(pic->y_recdata, pic->height, pic->width, pic->width, checksum_out[0]);
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/* The number of chroma pixels is half that of luma. */
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array_checksum(pic->u_recdata, pic->height >> 1, pic->width >> 1, pic->width >> 1, checksum_out[1]);
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array_checksum(pic->v_recdata, pic->height >> 1, pic->width >> 1, pic->width >> 1, checksum_out[2]);
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}
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