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/*
* 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
typedef struct y4m_input y4m_input;
/*The function used to perform chroma conversion.*/
typedef void (*y4m_convert_func)(y4m_input *_y4m, unsigned char *_dst,
unsigned char *_src);
struct y4m_input {
int pic_w;
int pic_h;
int fps_n;
int fps_d;
int par_n;
int par_d;
char interlace;
int src_c_dec_h;
int src_c_dec_v;
int dst_c_dec_h;
int dst_c_dec_v;
char chroma_type[16];
/*The size of each converted frame buffer.*/
size_t dst_buf_sz;
/*The amount to read directly into the converted frame buffer.*/
size_t dst_buf_read_sz;
/*The size of the auxilliary buffer.*/
size_t aux_buf_sz;
/*The amount to read into the auxilliary buffer.*/
size_t aux_buf_read_sz;
y4m_convert_func convert;
unsigned char *dst_buf;
unsigned char *aux_buf;
enum aom_img_fmt aom_fmt;
int bps;
unsigned int bit_depth;
aom_color_range_t color_range;
};
/**
* 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_
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