FFmpeg/libavcore/imgutils.c

/*
 * 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
 */

/**
 * @file
 * misc image utilities
 */

#include "imgutils.h"
#include "libavutil/pixdesc.h"

int av_fill_image_linesizes(int linesize[4], enum PixelFormat pix_fmt, int width)
{
    int i;
    const AVPixFmtDescriptor *desc = &av_pix_fmt_descriptors[pix_fmt];
    int max_step     [4];       /* max pixel step for each plane */
    int max_step_comp[4];       /* the component for each plane which has the max pixel step */

    memset(linesize, 0, 4*sizeof(linesize[0]));

    if (desc->flags & PIX_FMT_HWACCEL)
        return -1;

    if (desc->flags & PIX_FMT_BITSTREAM) {
        linesize[0] = (width * (desc->comp[0].step_minus1+1) + 7) >> 3;
        return 0;
    }

    memset(max_step     , 0, sizeof(max_step     ));
    memset(max_step_comp, 0, sizeof(max_step_comp));
    for (i = 0; i < 4; i++) {
        const AVComponentDescriptor *comp = &(desc->comp[i]);
        if ((comp->step_minus1+1) > max_step[comp->plane]) {
            max_step     [comp->plane] = comp->step_minus1+1;
            max_step_comp[comp->plane] = i;
        }
    }

    for (i = 0; i < 4; i++) {
        int s = (max_step_comp[i] == 1 || max_step_comp[i] == 2) ? desc->log2_chroma_w : 0;
        linesize[i] = max_step[i] * (((width + (1 << s) - 1)) >> s);
    }

    return 0;
}

int av_fill_image_pointers(uint8_t *data[4], enum PixelFormat pix_fmt, int height,
                           uint8_t *ptr, const int linesize[4])
{
    int size, h2, size2;
    const AVPixFmtDescriptor *desc = &av_pix_fmt_descriptors[pix_fmt];

    size = linesize[0] * height;
    switch(pix_fmt) {
    case PIX_FMT_YUV420P:
    case PIX_FMT_YUV422P:
    case PIX_FMT_YUV444P:
    case PIX_FMT_YUV410P:
    case PIX_FMT_YUV411P:
    case PIX_FMT_YUV440P:
    case PIX_FMT_YUVJ420P:
    case PIX_FMT_YUVJ422P:
    case PIX_FMT_YUVJ444P:
    case PIX_FMT_YUVJ440P:
    case PIX_FMT_YUV420P16LE:
    case PIX_FMT_YUV422P16LE:
    case PIX_FMT_YUV444P16LE:
    case PIX_FMT_YUV420P16BE:
    case PIX_FMT_YUV422P16BE:
    case PIX_FMT_YUV444P16BE:
        h2 = (height + (1 << desc->log2_chroma_h) - 1) >> desc->log2_chroma_h;
        size2 = linesize[1] * h2;
        data[0] = ptr;
        data[1] = data[0] + size;
        data[2] = data[1] + size2;
        data[3] = NULL;
        return size + 2 * size2;
    case PIX_FMT_YUVA420P:
        h2 = (height + (1 << desc->log2_chroma_h) - 1) >> desc->log2_chroma_h;
        size2 = linesize[1] * h2;
        data[0] = ptr;
        data[1] = data[0] + size;
        data[2] = data[1] + size2;
        data[3] = data[1] + size2 + size2;
        return 2 * size + 2 * size2;
    case PIX_FMT_NV12:
    case PIX_FMT_NV21:
        h2 = (height + (1 << desc->log2_chroma_h) - 1) >> desc->log2_chroma_h;
        size2 = linesize[1] * h2;
        data[0] = ptr;
        data[1] = data[0] + size;
        data[2] = NULL;
        data[3] = NULL;
        return size + size2;
    case PIX_FMT_RGB24:
    case PIX_FMT_BGR24:
    case PIX_FMT_ARGB:
    case PIX_FMT_ABGR:
    case PIX_FMT_RGBA:
    case PIX_FMT_BGRA:
    case PIX_FMT_RGB48BE:
    case PIX_FMT_RGB48LE:
    case PIX_FMT_GRAY16BE:
    case PIX_FMT_GRAY16LE:
    case PIX_FMT_BGR444BE:
    case PIX_FMT_BGR444LE:
    case PIX_FMT_BGR555BE:
    case PIX_FMT_BGR555LE:
    case PIX_FMT_BGR565BE:
    case PIX_FMT_BGR565LE:
    case PIX_FMT_RGB444BE:
    case PIX_FMT_RGB444LE:
    case PIX_FMT_RGB555BE:
    case PIX_FMT_RGB555LE:
    case PIX_FMT_RGB565BE:
    case PIX_FMT_RGB565LE:
    case PIX_FMT_YUYV422:
    case PIX_FMT_UYVY422:
    case PIX_FMT_UYYVYY411:
    case PIX_FMT_RGB4:
    case PIX_FMT_BGR4:
    case PIX_FMT_MONOWHITE:
    case PIX_FMT_MONOBLACK:
    case PIX_FMT_Y400A:
        data[0] = ptr;
        data[1] = NULL;
        data[2] = NULL;
        data[3] = NULL;
        return size;
    case PIX_FMT_PAL8:
    case PIX_FMT_RGB8:
    case PIX_FMT_BGR8:
    case PIX_FMT_RGB4_BYTE:
    case PIX_FMT_BGR4_BYTE:
    case PIX_FMT_GRAY8:
        size2 = (size + 3) & ~3;
        data[0] = ptr;
        data[1] = ptr + size2; /* palette is stored here as 256 32 bit words */
        data[2] = NULL;
        data[3] = NULL;
        return size2 + 256 * 4;
    default:
        data[0] = NULL;
        data[1] = NULL;
        data[2] = NULL;
        data[3] = NULL;
        return -1;
    }
}