libavutil/pixdesc.h

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/*
 * pixel format descriptor
 * Copyright (c) 2009 Michael Niedermayer <michaelni@gmx.at>
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#ifndef AVUTIL_PIXDESC_H
#define AVUTIL_PIXDESC_H

#include <inttypes.h>
#include "pixfmt.h"

typedef struct AVComponentDescriptor{
    uint16_t plane        :2;            

    uint16_t step_minus1  :3;

    uint16_t offset_plus1 :3;
    uint16_t shift        :3;            
    uint16_t depth_minus1 :4;            
}AVComponentDescriptor;

typedef struct AVPixFmtDescriptor{
    const char *name;
    uint8_t nb_components;      

    uint8_t log2_chroma_w;      

    uint8_t log2_chroma_h;
    uint8_t flags;

    AVComponentDescriptor comp[4];
}AVPixFmtDescriptor;

#define PIX_FMT_BE        1 
#define PIX_FMT_PAL       2 
#define PIX_FMT_BITSTREAM 4 
#define PIX_FMT_HWACCEL   8 
#define PIX_FMT_PLANAR   16 
#define PIX_FMT_RGB      32 

#define PIX_FMT_PSEUDOPAL 64

#define PIX_FMT_ALPHA   128 


#if FF_API_PIX_FMT_DESC

extern const AVPixFmtDescriptor av_pix_fmt_descriptors[];
#endif

void av_read_image_line(uint16_t *dst, const uint8_t *data[4], const int linesize[4],
                        const AVPixFmtDescriptor *desc, int x, int y, int c, int w, int read_pal_component);

void av_write_image_line(const uint16_t *src, uint8_t *data[4], const int linesize[4],
                         const AVPixFmtDescriptor *desc, int x, int y, int c, int w);

enum AVPixelFormat av_get_pix_fmt(const char *name);

const char *av_get_pix_fmt_name(enum AVPixelFormat pix_fmt);

char *av_get_pix_fmt_string (char *buf, int buf_size, enum AVPixelFormat pix_fmt);

int av_get_bits_per_pixel(const AVPixFmtDescriptor *pixdesc);

int av_get_padded_bits_per_pixel(const AVPixFmtDescriptor *pixdesc);

const AVPixFmtDescriptor *av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt);

const AVPixFmtDescriptor *av_pix_fmt_desc_next(const AVPixFmtDescriptor *prev);

enum AVPixelFormat av_pix_fmt_desc_get_id(const AVPixFmtDescriptor *desc);

int av_pix_fmt_get_chroma_sub_sample(enum AVPixelFormat pix_fmt,
                                     int *h_shift, int *v_shift);


#endif /* AVUTIL_PIXDESC_H */

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