chromium/third_party/libaom/source/libaom/common/y4minput.h

/*
 * Copyright (c) 2016, Alliance for Open Media. All rights reserved.
 *
 * This source code is subject to the terms of the BSD 2 Clause License and
 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
 * was not distributed with this source code in the LICENSE file, you can
 * obtain it at www.aomedia.org/license/software. If the Alliance for Open
 * Media Patent License 1.0 was not distributed with this source code in the
 * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
 *
 * Based on code from the OggTheora software codec source code,
 * Copyright (C) 2002-2010 The Xiph.Org Foundation and contributors.
 */

#ifndef AOM_COMMON_Y4MINPUT_H_
#define AOM_COMMON_Y4MINPUT_H_

#include <stdio.h>
#include "aom/aom_image.h"

#ifdef __cplusplus
extern "C" {
#endif

y4m_input;

/*The function used to perform chroma conversion.*/
y4m_convert_func;

struct y4m_input { … };

/**
 * Open the input file, treating it as Y4M. |y4m_ctx| is filled in after
 * reading it. Note that |csp| should only be set for 420 input, and the input
 * chroma is shifted if necessary. The code does not support the conversion
 * from co-located to vertical. The |skip_buffer| indicates bytes that were
 * previously read from |file|, to do input-type detection; this buffer will
 * be read before the |file| is read. It is of size |num_skip|, which *must*
 * be 8 or less.
 *
 * Returns 0 on success, -1 on failure.
 */
int y4m_input_open(y4m_input *y4m_ctx, FILE *file, char *skip_buffer,
                   int num_skip, aom_chroma_sample_position_t csp,
                   int only_420);
void y4m_input_close(y4m_input *_y4m);
int y4m_input_fetch_frame(y4m_input *_y4m, FILE *_fin, aom_image_t *img);

#ifdef __cplusplus
}  // extern "C"
#endif

#endif  // AOM_COMMON_Y4MINPUT_H_