mirror of
https://github.com/ultravideo/uvg266.git
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b8a618e666
Enforce bit depth promised by --input-bitdepth to avoid crashes when larger values are provided. Do endianess byte swap for all bytes when the buffer gets extended to multiple of 8 pixels, and not just the number of input pixels. Don't swap bytes on a little-endian system.
311 lines
9.1 KiB
C
311 lines
9.1 KiB
C
/*****************************************************************************
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* This file is part of Kvazaar HEVC encoder.
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*
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* Copyright (C) 2013-2015 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 it under
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* the terms of the GNU Lesser General Public License as published by the
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* Free Software Foundation; either version 2.1 of the License, or (at your
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* option) any later version.
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*
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* Kvazaar is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along
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* 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 <string.h>
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#include <stdio.h>
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#include "yuv_io.h"
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static void fill_after_frame(unsigned height, unsigned array_width,
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unsigned array_height, kvz_pixel *data)
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{
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kvz_pixel* p = data + height * array_width;
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kvz_pixel* end = data + array_width * array_height;
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while (p < end) {
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// Fill the line by copying the line above.
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memcpy(p, p - array_width, array_width);
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p += array_width;
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}
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}
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static int read_and_fill_frame_data(FILE *file,
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unsigned width, unsigned height, unsigned bytes_per_sample,
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unsigned array_width, kvz_pixel *data)
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{
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kvz_pixel* p = data;
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kvz_pixel* end = data + array_width * height;
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kvz_pixel fill_char;
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unsigned i;
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while (p < end) {
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// Read the beginning of the line from input.
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if (width != fread(p, bytes_per_sample, width, file))
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return 0;
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// Fill the rest with the last pixel value.
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fill_char = p[width - 1];
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for (i = width; i < array_width; ++i) {
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p[i] = fill_char;
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}
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p += array_width;
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}
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return 1;
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}
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static void swap_16b_buffer_bytes(kvz_pixel* input, int size)
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{
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for (int i = 0; i < size; ++i) {
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input[i] = ((input[i] & 0xff) << 8) + ((input[i] & 0xff00) >> 8);
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}
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}
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static void shift_to_bitdepth(kvz_pixel* input, int size, int from_bitdepth, int to_bitdepth)
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{
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int shift = to_bitdepth - from_bitdepth;
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kvz_pixel bitdepth_mask = (1 << from_bitdepth) - 1;
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for (int i = 0; i < size; ++i) {
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// Shifting by a negative number is undefined.
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if (shift > 0) {
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input[i] = (input[i] & bitdepth_mask) << shift;
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} else {
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input[i] = (input[i] & bitdepth_mask) >> shift;
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}
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}
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}
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// Shift and copy 1-byte aligned samples to 2-byte aligned array
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static void shift_to_bitdepth_and_spread(kvz_pixel *input,
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int size,
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int from_bitdepth,
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int to_bitdepth)
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{
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assert(sizeof(kvz_pixel) > 1);
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int shift = to_bitdepth - from_bitdepth;
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unsigned char *byte_buf = (unsigned char *)input;
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kvz_pixel bitdepth_mask = (1 << from_bitdepth) - 1;
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// Starting from the back of the 1-byte samples, copy each sample to it's
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// place in the 2-byte per sample array, overwriting the bytes that have
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// already been copied in the process.
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// Even though the two pointers are aliased, this should work because the
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// future values read through byte_buf poiner never change as a result of
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// writing through input pointer.
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for (int i = size - 1; i >= 0; --i) {
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// Shifting by a negative number is undefined.
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if (shift > 0) {
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input[i] = (byte_buf[i] & bitdepth_mask) << shift;
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} else {
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input[i] = (byte_buf[i] & bitdepth_mask) >> shift;
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}
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}
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}
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static bool machine_is_big_endian()
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{
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// Big and little endianess refers to which end of the egg you prefer to eat
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// first. Therefore in big endian system, the most significant bits are in
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// the first address.
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uint16_t number = 1;
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char first_byte = *(char*)&number;
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return (first_byte == 0);
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}
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static void mask_to_bitdepth(kvz_pixel *buf, unsigned length, unsigned bitdepth)
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{
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kvz_pixel bitdepth_mask = (1 << bitdepth) - 1;
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for (int i = 0; i < length; ++i) {
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buf[i] = buf[i] & bitdepth_mask;
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}
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}
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static int yuv_io_read_plane(
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FILE* file,
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unsigned in_width, unsigned in_height, unsigned in_bitdepth,
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unsigned out_width, unsigned out_height, unsigned out_bitdepth,
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kvz_pixel *out_buf)
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{
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unsigned bytes_per_sample = in_bitdepth > 8 ? 2 : 1;
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unsigned buf_bytes = in_width * in_height * bytes_per_sample;
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unsigned out_length = out_width * out_height;
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if (in_width == out_width) {
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// No need to extend pixels.
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const size_t pixel_size = sizeof(unsigned char);
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if (fread(out_buf, pixel_size, buf_bytes, file) != buf_bytes) return 0;
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} else {
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// Need to copy pixels to fill the image in horizontal direction.
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if (!read_and_fill_frame_data(file, in_width, in_height, bytes_per_sample, out_width, out_buf)) return 0;
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}
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if (in_height != out_height) {
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// Need to copy pixels to fill the image in vertical direction.
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fill_after_frame(in_height, out_width, out_height, out_buf);
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}
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if (in_bitdepth > 8) {
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// Assume little endian input.
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if (machine_is_big_endian()) {
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swap_16b_buffer_bytes(out_buf, out_length);
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}
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}
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// Shift the data to the correct bitdepth.
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// Ignore any bits larger than in_bitdepth to guarantee ouput data will be
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// in the correct range.
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if (in_bitdepth <= 8 && out_bitdepth > 8) {
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shift_to_bitdepth_and_spread(out_buf, out_length, in_bitdepth, out_bitdepth);
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} else if (in_bitdepth != out_bitdepth) {
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shift_to_bitdepth(out_buf, out_length, in_bitdepth, out_bitdepth);
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} else if (in_bitdepth % 8 != 0) {
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mask_to_bitdepth(out_buf, out_length, out_bitdepth);
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}
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return 1;
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}
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/**
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* \brief Read a single frame from a file.
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*
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* Read luma and chroma values from file. Extend pixels if the image buffer
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* is larger than the input image.
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*
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* \param file input file
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* \param input_width width of the input video in pixels
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* \param input_height height of the input video in pixels
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* \param img_out image buffer
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*
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* \return 1 on success, 0 on failure
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*/
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int yuv_io_read(FILE* file,
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unsigned in_width, unsigned out_width,
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unsigned in_bitdepth, unsigned out_bitdepth,
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kvz_picture *img_out)
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{
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assert(in_width % 2 == 0);
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assert(out_width % 2 == 0);
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int ok;
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ok = yuv_io_read_plane(
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file,
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in_width, out_width, in_bitdepth,
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img_out->width, img_out->height, out_bitdepth,
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img_out->y);
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if (!ok) return 0;
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if (img_out->chroma_format != KVZ_CSP_400) {
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unsigned uv_width_in = in_width / 2;
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unsigned uv_height_in = out_width / 2;
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unsigned uv_width_out = img_out->width / 2;
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unsigned uv_height_out = img_out->height / 2;
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ok = yuv_io_read_plane(
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file,
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uv_width_in, uv_height_in, in_bitdepth,
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uv_width_out, uv_height_out, out_bitdepth,
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img_out->u);
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if (!ok) return 0;
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ok = yuv_io_read_plane(
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file,
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uv_width_in, uv_height_in, in_bitdepth,
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uv_width_out, uv_height_out, out_bitdepth,
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img_out->v);
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if (!ok) return 0;
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}
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return 1;
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}
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/**
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* \brief Seek forward in a YUV file.
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*
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* \param file the input file
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* \param frames number of frames to seek
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* \param input_width width of the input video in pixels
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* \param input_height height of the input video in pixels
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*
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* \return 1 on success, 0 on failure
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*/
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int yuv_io_seek(FILE* file, unsigned frames,
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unsigned input_width, unsigned input_height)
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{
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const size_t frame_bytes = input_width * input_height * 3 / 2;
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const int64_t skip_bytes = (int64_t)(frames * frame_bytes);
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// Attempt to seek normally.
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size_t error = fseek(file, skip_bytes, SEEK_CUR);
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if (!error) return 1;
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// Seek failed. Skip data by reading.
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error = 0;
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unsigned char* tmp[4096];
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size_t bytes_left = skip_bytes;
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while (bytes_left > 0 && !error) {
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const size_t skip = MIN(4096, bytes_left);
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error = fread(tmp, sizeof(unsigned char), skip, file) != skip;
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bytes_left -= skip;
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}
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return !error || feof(file);
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}
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/**
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* \brief Write a single frame to a file.
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*
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* \param file output file
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* \param img image to output
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* \param output_width width of the output in pixels
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* \param output_height height of the output in pixels
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*
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* \return 1 on success, 0 on failure
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*/
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int yuv_io_write(FILE* file,
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const kvz_picture *img,
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unsigned output_width, unsigned output_height)
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{
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const int width = img->width;
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for (int y = 0; y < output_height; ++y) {
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fwrite(&img->y[y * width], sizeof(*img->y), output_width, file);
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// TODO: Check that fwrite succeeded.
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}
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if (img->chroma_format != KVZ_CSP_400) {
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for (int y = 0; y < output_height / 2; ++y) {
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fwrite(&img->u[y * width / 2], sizeof(*img->u), output_width / 2, file);
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}
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for (int y = 0; y < output_height / 2; ++y) {
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fwrite(&img->v[y * width / 2], sizeof(*img->v), output_width / 2, file);
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}
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}
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return 1;
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}
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