mirror of
https://github.com/ultravideo/uvg266.git
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124 lines
3.7 KiB
C
124 lines
3.7 KiB
C
/**
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* \file
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*
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* \author Marko Viitanen ( fador@iki.fi ),
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* Tampere University of Technology,
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* Department of Pervasive Computing.
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* \author Ari Koivula ( ari@koivu.la ),
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* Tampere University of Technology,
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* Department of Pervasive Computing.
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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(FILE *output, uint8_t *buffer, uint32_t buffer_len, uint8_t nal_ref, uint8_t nal_type, uint8_t temporal_id)
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{
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uint8_t byte;
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uint32_t i;
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uint8_t zerocount = 0;
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// Some useful constants
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const uint8_t emulation_prevention_three_byte = 0x03;
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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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// start_code_prefix_one_3bytes
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fwrite(&zero, 1, 1, output);
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fwrite(&zero, 1, 1, output);
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fwrite(&start_code_prefix_one_3bytes, 1, 1, output);
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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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fwrite(&byte, 1, 1, output);
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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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fwrite(&byte, 1, 1, output);
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// Write out bytes and add emulation_prevention_three_byte when needed
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for (i = 0; i < buffer_len; ++i) {
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// Prevent 0x0000 + 00/01/02 byte sequences from occurring by prefixing
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// the last byte with 0x03. Do the same for 0x03.
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if (zerocount == 2 && buffer[i] < 4) {
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fwrite(&emulation_prevention_three_byte, 1, 1, output);
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zerocount = 0;
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}
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if(buffer[i] == 0) {
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zerocount++;
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} else {
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zerocount = 0;
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}
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// Write the actual data
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fwrite(&buffer[i], 1, 1, output);
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}
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// If last byte was 0, add emulation_prevention_three_byte
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if (buffer[buffer_len - 1] == 0) {
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fwrite(&emulation_prevention_three_byte, 1, 1, output);
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}
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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 uint8_t* 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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unsigned char mask;
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unsigned int 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 = (x & 0xff) ^ (y & 0xff) ^ (x >> 8) ^ (y >> 8);
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checksum += (data[(y * stride) + x] & 0xff) ^ mask;
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checksum &= 0xffffffff;
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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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int stride = pic->width; /* TODO: != width, if there is a luma margin. */
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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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} |