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ffmpeg / libavutil / imgutils.c @ 08675bb3

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/*
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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/**
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 * @file
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 * misc image utilities
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 */
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#include "imgutils.h"
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#include "internal.h"
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#include "libavutil/pixdesc.h"
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void av_image_fill_max_pixsteps(int max_pixsteps[4], int max_pixstep_comps[4],
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                                const AVPixFmtDescriptor *pixdesc)
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{
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    int i;
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    memset(max_pixsteps, 0, 4*sizeof(max_pixsteps[0]));
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    if (max_pixstep_comps)
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        memset(max_pixstep_comps, 0, 4*sizeof(max_pixstep_comps[0]));
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    for (i = 0; i < 4; i++) {
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        const AVComponentDescriptor *comp = &(pixdesc->comp[i]);
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        if ((comp->step_minus1+1) > max_pixsteps[comp->plane]) {
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            max_pixsteps[comp->plane] = comp->step_minus1+1;
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            if (max_pixstep_comps)
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                max_pixstep_comps[comp->plane] = i;
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        }
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    }
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}
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int av_image_get_linesize(enum PixelFormat pix_fmt, int width, int plane)
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{
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    const AVPixFmtDescriptor *desc = &av_pix_fmt_descriptors[pix_fmt];
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    int max_step     [4];       /* max pixel step for each plane */
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    int max_step_comp[4];       /* the component for each plane which has the max pixel step */
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    int s;
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    if (desc->flags & PIX_FMT_BITSTREAM)
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        return (width * (desc->comp[0].step_minus1+1) + 7) >> 3;
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    av_image_fill_max_pixsteps(max_step, max_step_comp, desc);
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    s = (max_step_comp[plane] == 1 || max_step_comp[plane] == 2) ? desc->log2_chroma_w : 0;
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    return max_step[plane] * (((width + (1 << s) - 1)) >> s);
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}
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int av_image_fill_linesizes(int linesizes[4], enum PixelFormat pix_fmt, int width)
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{
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    int i;
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    const AVPixFmtDescriptor *desc = &av_pix_fmt_descriptors[pix_fmt];
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    int max_step     [4];       /* max pixel step for each plane */
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    int max_step_comp[4];       /* the component for each plane which has the max pixel step */
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    memset(linesizes, 0, 4*sizeof(linesizes[0]));
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    if ((unsigned)pix_fmt >= PIX_FMT_NB || desc->flags & PIX_FMT_HWACCEL)
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        return AVERROR(EINVAL);
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    if (desc->flags & PIX_FMT_BITSTREAM) {
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        if (width > (INT_MAX -7) / (desc->comp[0].step_minus1+1))
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            return AVERROR(EINVAL);
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        linesizes[0] = (width * (desc->comp[0].step_minus1+1) + 7) >> 3;
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        return 0;
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    }
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    av_image_fill_max_pixsteps(max_step, max_step_comp, desc);
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    for (i = 0; i < 4; i++) {
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        int s = (max_step_comp[i] == 1 || max_step_comp[i] == 2) ? desc->log2_chroma_w : 0;
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        int shifted_w = ((width + (1 << s) - 1)) >> s;
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        if (max_step[i] > INT_MAX / shifted_w)
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            return AVERROR(EINVAL);
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        linesizes[i] = max_step[i] * shifted_w;
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    }
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    return 0;
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}
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int av_image_fill_pointers(uint8_t *data[4], enum PixelFormat pix_fmt, int height,
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                           uint8_t *ptr, const int linesizes[4])
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{
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    int i, total_size, size[4], has_plane[4];
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    const AVPixFmtDescriptor *desc = &av_pix_fmt_descriptors[pix_fmt];
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    memset(data     , 0, sizeof(data[0])*4);
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    memset(size     , 0, sizeof(size));
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    memset(has_plane, 0, sizeof(has_plane));
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    if ((unsigned)pix_fmt >= PIX_FMT_NB || desc->flags & PIX_FMT_HWACCEL)
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        return AVERROR(EINVAL);
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    data[0] = ptr;
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    if (linesizes[0] > (INT_MAX - 1024) / height)
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        return AVERROR(EINVAL);
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    size[0] = linesizes[0] * height;
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    if (desc->flags & PIX_FMT_PAL) {
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        size[0] = (size[0] + 3) & ~3;
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        data[1] = ptr + size[0]; /* palette is stored here as 256 32 bits words */
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        return size[0] + 256 * 4;
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    }
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    for (i = 0; i < 4; i++)
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        has_plane[desc->comp[i].plane] = 1;
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    total_size = size[0];
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    for (i = 1; has_plane[i] && i < 4; i++) {
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        int h, s = (i == 1 || i == 2) ? desc->log2_chroma_h : 0;
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        data[i] = data[i-1] + size[i-1];
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        h = (height + (1 << s) - 1) >> s;
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        if (linesizes[i] > INT_MAX / h)
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            return AVERROR(EINVAL);
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        size[i] = h * linesizes[i];
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        if (total_size > INT_MAX - size[i])
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            return AVERROR(EINVAL);
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        total_size += size[i];
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    }
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    return total_size;
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}
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int ff_set_systematic_pal2(uint32_t pal[256], enum PixelFormat pix_fmt)
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{
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    int i;
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    for (i = 0; i < 256; i++) {
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        int r, g, b;
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        switch (pix_fmt) {
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        case PIX_FMT_RGB8:
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            r = (i>>5    )*36;
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            g = ((i>>2)&7)*36;
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            b = (i&3     )*85;
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            break;
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        case PIX_FMT_BGR8:
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            b = (i>>6    )*85;
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            g = ((i>>3)&7)*36;
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            r = (i&7     )*36;
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            break;
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        case PIX_FMT_RGB4_BYTE:
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            r = (i>>3    )*255;
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            g = ((i>>1)&3)*85;
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            b = (i&1     )*255;
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            break;
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        case PIX_FMT_BGR4_BYTE:
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            b = (i>>3    )*255;
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            g = ((i>>1)&3)*85;
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            r = (i&1     )*255;
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            break;
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        case PIX_FMT_GRAY8:
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            r = b = g = i;
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            break;
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        default:
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            return AVERROR(EINVAL);
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        }
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        pal[i] = b + (g<<8) + (r<<16);
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    }
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    return 0;
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}
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int av_image_alloc(uint8_t *pointers[4], int linesizes[4],
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                   int w, int h, enum PixelFormat pix_fmt, int align)
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{
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    int i, ret;
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    uint8_t *buf;
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    if ((ret = av_image_check_size(w, h, 0, NULL)) < 0)
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        return ret;
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    if ((ret = av_image_fill_linesizes(linesizes, pix_fmt, w)) < 0)
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        return ret;
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    for (i = 0; i < 4; i++)
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        linesizes[i] = FFALIGN(linesizes[i], align);
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    if ((ret = av_image_fill_pointers(pointers, pix_fmt, h, NULL, linesizes)) < 0)
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        return ret;
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    buf = av_malloc(ret + align);
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    if (!buf)
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        return AVERROR(ENOMEM);
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    if ((ret = av_image_fill_pointers(pointers, pix_fmt, h, buf, linesizes)) < 0) {
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        av_free(buf);
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        return ret;
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    }
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    if (av_pix_fmt_descriptors[pix_fmt].flags & PIX_FMT_PAL)
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        ff_set_systematic_pal2((uint32_t*)pointers[1], pix_fmt);
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    return ret;
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}
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typedef struct ImgUtils {
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    const AVClass *class;
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    int   log_offset;
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    void *log_ctx;
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} ImgUtils;
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static const AVClass imgutils_class = { "IMGUTILS", av_default_item_name, NULL, LIBAVUTIL_VERSION_INT, offsetof(ImgUtils, log_offset), offsetof(ImgUtils, log_ctx) };
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int av_image_check_size(unsigned int w, unsigned int h, int log_offset, void *log_ctx)
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{
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    ImgUtils imgutils = { &imgutils_class, log_offset, log_ctx };
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    if ((int)w>0 && (int)h>0 && (w+128)*(uint64_t)(h+128) < INT_MAX/8)
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        return 0;
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    av_log(&imgutils, AV_LOG_ERROR, "Picture size %ux%u is invalid\n", w, h);
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    return AVERROR(EINVAL);
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}
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void av_image_copy_plane(uint8_t       *dst, int dst_linesize,
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                         const uint8_t *src, int src_linesize,
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                         int bytewidth, int height)
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{
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    if (!dst || !src)
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        return;
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    for (;height > 0; height--) {
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        memcpy(dst, src, bytewidth);
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        dst += dst_linesize;
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        src += src_linesize;
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    }
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}
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void av_image_copy(uint8_t *dst_data[4], int dst_linesizes[4],
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                   const uint8_t *src_data[4], const int src_linesizes[4],
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                   enum PixelFormat pix_fmt, int width, int height)
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{
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    const AVPixFmtDescriptor *desc = &av_pix_fmt_descriptors[pix_fmt];
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    if (desc->flags & PIX_FMT_HWACCEL)
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        return;
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    if (desc->flags & PIX_FMT_PAL) {
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        av_image_copy_plane(dst_data[0], dst_linesizes[0],
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                            src_data[0], src_linesizes[0],
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                            width, height);
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        /* copy the palette */
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        memcpy(dst_data[1], src_data[1], 4*256);
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    } else {
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        int i, planes_nb = 0;
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        for (i = 0; i < desc->nb_components; i++)
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            planes_nb = FFMAX(planes_nb, desc->comp[i].plane + 1);
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        for (i = 0; i < planes_nb; i++) {
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            int h = height;
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            int bwidth = av_image_get_linesize(pix_fmt, width, i);
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            if (i == 1 || i == 2) {
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                h= -((-height)>>desc->log2_chroma_h);
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            }
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            av_image_copy_plane(dst_data[i], dst_linesizes[i],
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                                src_data[i], src_linesizes[i],
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                                bwidth, h);
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        }
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    }
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}