99 lines
3.9 KiB
C
99 lines
3.9 KiB
C
/*
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* Copyright (c) 2016, Alliance for Open Media. All rights reserved.
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*
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* This source code is subject to the terms of the BSD 2 Clause License and
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* the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
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* was not distributed with this source code in the LICENSE file, you can
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* obtain it at www.aomedia.org/license/software. If the Alliance for Open
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* Media Patent License 1.0 was not distributed with this source code in the
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* PATENTS file, you can obtain it at www.aomedia.org/license/patent.
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*/
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#include <stdbool.h>
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#include "common/rawenc.h"
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// Number of bytes to write per batch in write_greyscale.
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#define BATCH_SIZE 8
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// Interface to writing to either a file or MD5Context. Takes a pointer to
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// either the file or MD5Context, the buffer, the size of each element, and
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// number of elements to write. Note that size and nmemb (last two args) must
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// be unsigned int, as the interface to MD5Update requires that.
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typedef void (*WRITER)(void *, const uint8_t *, unsigned int, unsigned int);
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static void write_file(void *fp, const uint8_t *buffer, unsigned int size,
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unsigned int nmemb) {
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fwrite(buffer, size, nmemb, (FILE *)fp);
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}
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static void write_md5(void *md5, const uint8_t *buffer, unsigned int size,
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unsigned int nmemb) {
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MD5Update((MD5Context *)md5, buffer, size * nmemb);
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}
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// Writes out n neutral chroma samples (for greyscale).
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static void write_greyscale(const aom_image_t *img, int n, WRITER writer_func,
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void *file_or_md5) {
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// Batch 8 writes for low bit-depth, 4 writes for high bit-depth.
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int bytes_per_sample;
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union {
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uint8_t u8[BATCH_SIZE];
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uint16_t u16[BATCH_SIZE / 2];
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} batched;
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if (img->fmt & AOM_IMG_FMT_HIGHBITDEPTH) {
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bytes_per_sample = 2;
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for (int i = 0; i < BATCH_SIZE / 2; ++i) {
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batched.u16[i] = 1 << (img->bit_depth - 1);
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}
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} else {
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bytes_per_sample = 1;
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for (int i = 0; i < BATCH_SIZE; ++i) {
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batched.u8[i] = 0x80;
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}
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}
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const int samples_per_batch = BATCH_SIZE / bytes_per_sample;
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const int num_batched_writes = n / samples_per_batch;
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for (int i = 0; i < num_batched_writes; ++i) {
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writer_func(file_or_md5, batched.u8, sizeof(uint8_t), BATCH_SIZE);
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}
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const int remaining = n % samples_per_batch;
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for (int i = 0; i < remaining; ++i) {
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writer_func(file_or_md5, batched.u8, sizeof(uint8_t), bytes_per_sample);
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}
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}
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// Encapsulates the logic for writing raw data to either an image file or
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// to an MD5 context.
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static void raw_write_image_file_or_md5(const aom_image_t *img,
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const int *planes, const int num_planes,
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void *file_or_md5, WRITER writer_func) {
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const bool high_bitdepth = img->fmt & AOM_IMG_FMT_HIGHBITDEPTH;
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const int bytes_per_sample = high_bitdepth ? 2 : 1;
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for (int i = 0; i < num_planes; ++i) {
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const int plane = planes[i];
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const int w = aom_img_plane_width(img, plane);
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const int h = aom_img_plane_height(img, plane);
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// If we're on a color plane and the output is monochrome, write a greyscale
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// value. Since there are only YUV planes, compare against Y.
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if (img->monochrome && plane != AOM_PLANE_Y) {
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write_greyscale(img, w * h, writer_func, file_or_md5);
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continue;
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}
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const unsigned char *buf = img->planes[plane];
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const int stride = img->stride[plane];
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for (int y = 0; y < h; ++y) {
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writer_func(file_or_md5, buf, bytes_per_sample, w);
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buf += stride;
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}
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}
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}
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void raw_write_image_file(const aom_image_t *img, const int *planes,
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const int num_planes, FILE *file) {
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raw_write_image_file_or_md5(img, planes, num_planes, file, write_file);
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}
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void raw_update_image_md5(const aom_image_t *img, const int *planes,
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const int num_planes, MD5Context *md5) {
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raw_write_image_file_or_md5(img, planes, num_planes, md5, write_md5);
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}
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