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  1. /*
  2.  * This file is part of FFmpeg.
  3.  *
  4.  * FFmpeg is free software; you can redistribute it and/or
  5.  * modify it under the terms of the GNU Lesser General Public
  6.  * License as published by the Free Software Foundation; either
  7.  * version 2.1 of the License, or (at your option) any later version.
  8.  *
  9.  * FFmpeg is distributed in the hope that it will be useful,
  10.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12.  * Lesser General Public License for more details.
  13.  *
  14.  * You should have received a copy of the GNU Lesser General Public
  15.  * License along with FFmpeg; if not, write to the Free Software
  16.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  17.  */
  18.  
  19. /**
  20.  * @file
  21.  * misc image utilities
  22.  */
  23.  
  24. #include "avassert.h"
  25. #include "common.h"
  26. #include "imgutils.h"
  27. #include "internal.h"
  28. #include "intreadwrite.h"
  29. #include "log.h"
  30. #include "mathematics.h"
  31. #include "pixdesc.h"
  32. #include "rational.h"
  33.  
  34. void av_image_fill_max_pixsteps(int max_pixsteps[4], int max_pixstep_comps[4],
  35.                                 const AVPixFmtDescriptor *pixdesc)
  36. {
  37.     int i;
  38.     memset(max_pixsteps, 0, 4*sizeof(max_pixsteps[0]));
  39.     if (max_pixstep_comps)
  40.         memset(max_pixstep_comps, 0, 4*sizeof(max_pixstep_comps[0]));
  41.  
  42.     for (i = 0; i < 4; i++) {
  43.         const AVComponentDescriptor *comp = &(pixdesc->comp[i]);
  44.         if ((comp->step_minus1+1) > max_pixsteps[comp->plane]) {
  45.             max_pixsteps[comp->plane] = comp->step_minus1+1;
  46.             if (max_pixstep_comps)
  47.                 max_pixstep_comps[comp->plane] = i;
  48.         }
  49.     }
  50. }
  51.  
  52. static inline
  53. int image_get_linesize(int width, int plane,
  54.                        int max_step, int max_step_comp,
  55.                        const AVPixFmtDescriptor *desc)
  56. {
  57.     int s, shifted_w, linesize;
  58.  
  59.     if (!desc)
  60.         return AVERROR(EINVAL);
  61.  
  62.     if (width < 0)
  63.         return AVERROR(EINVAL);
  64.     s = (max_step_comp == 1 || max_step_comp == 2) ? desc->log2_chroma_w : 0;
  65.     shifted_w = ((width + (1 << s) - 1)) >> s;
  66.     if (shifted_w && max_step > INT_MAX / shifted_w)
  67.         return AVERROR(EINVAL);
  68.     linesize = max_step * shifted_w;
  69.  
  70.     if (desc->flags & AV_PIX_FMT_FLAG_BITSTREAM)
  71.         linesize = (linesize + 7) >> 3;
  72.     return linesize;
  73. }
  74.  
  75. int av_image_get_linesize(enum AVPixelFormat pix_fmt, int width, int plane)
  76. {
  77.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
  78.     int max_step     [4];       /* max pixel step for each plane */
  79.     int max_step_comp[4];       /* the component for each plane which has the max pixel step */
  80.  
  81.     if (!desc || desc->flags & AV_PIX_FMT_FLAG_HWACCEL)
  82.         return AVERROR(EINVAL);
  83.  
  84.     av_image_fill_max_pixsteps(max_step, max_step_comp, desc);
  85.     return image_get_linesize(width, plane, max_step[plane], max_step_comp[plane], desc);
  86. }
  87.  
  88. int av_image_fill_linesizes(int linesizes[4], enum AVPixelFormat pix_fmt, int width)
  89. {
  90.     int i, ret;
  91.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
  92.     int max_step     [4];       /* max pixel step for each plane */
  93.     int max_step_comp[4];       /* the component for each plane which has the max pixel step */
  94.  
  95.     memset(linesizes, 0, 4*sizeof(linesizes[0]));
  96.  
  97.     if (!desc || desc->flags & AV_PIX_FMT_FLAG_HWACCEL)
  98.         return AVERROR(EINVAL);
  99.  
  100.     av_image_fill_max_pixsteps(max_step, max_step_comp, desc);
  101.     for (i = 0; i < 4; i++) {
  102.         if ((ret = image_get_linesize(width, i, max_step[i], max_step_comp[i], desc)) < 0)
  103.             return ret;
  104.         linesizes[i] = ret;
  105.     }
  106.  
  107.     return 0;
  108. }
  109.  
  110. int av_image_fill_pointers(uint8_t *data[4], enum AVPixelFormat pix_fmt, int height,
  111.                            uint8_t *ptr, const int linesizes[4])
  112. {
  113.     int i, total_size, size[4] = { 0 }, has_plane[4] = { 0 };
  114.  
  115.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
  116.     memset(data     , 0, sizeof(data[0])*4);
  117.  
  118.     if (!desc || desc->flags & AV_PIX_FMT_FLAG_HWACCEL)
  119.         return AVERROR(EINVAL);
  120.  
  121.     data[0] = ptr;
  122.     if (linesizes[0] > (INT_MAX - 1024) / height)
  123.         return AVERROR(EINVAL);
  124.     size[0] = linesizes[0] * height;
  125.  
  126.     if (desc->flags & AV_PIX_FMT_FLAG_PAL ||
  127.         desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL) {
  128.         size[0] = (size[0] + 3) & ~3;
  129.         data[1] = ptr + size[0]; /* palette is stored here as 256 32 bits words */
  130.         return size[0] + 256 * 4;
  131.     }
  132.  
  133.     for (i = 0; i < 4; i++)
  134.         has_plane[desc->comp[i].plane] = 1;
  135.  
  136.     total_size = size[0];
  137.     for (i = 1; i < 4 && has_plane[i]; i++) {
  138.         int h, s = (i == 1 || i == 2) ? desc->log2_chroma_h : 0;
  139.         data[i] = data[i-1] + size[i-1];
  140.         h = (height + (1 << s) - 1) >> s;
  141.         if (linesizes[i] > INT_MAX / h)
  142.             return AVERROR(EINVAL);
  143.         size[i] = h * linesizes[i];
  144.         if (total_size > INT_MAX - size[i])
  145.             return AVERROR(EINVAL);
  146.         total_size += size[i];
  147.     }
  148.  
  149.     return total_size;
  150. }
  151.  
  152. int avpriv_set_systematic_pal2(uint32_t pal[256], enum AVPixelFormat pix_fmt)
  153. {
  154.     int i;
  155.  
  156.     for (i = 0; i < 256; i++) {
  157.         int r, g, b;
  158.  
  159.         switch (pix_fmt) {
  160.         case AV_PIX_FMT_RGB8:
  161.             r = (i>>5    )*36;
  162.             g = ((i>>2)&7)*36;
  163.             b = (i&3     )*85;
  164.             break;
  165.         case AV_PIX_FMT_BGR8:
  166.             b = (i>>6    )*85;
  167.             g = ((i>>3)&7)*36;
  168.             r = (i&7     )*36;
  169.             break;
  170.         case AV_PIX_FMT_RGB4_BYTE:
  171.             r = (i>>3    )*255;
  172.             g = ((i>>1)&3)*85;
  173.             b = (i&1     )*255;
  174.             break;
  175.         case AV_PIX_FMT_BGR4_BYTE:
  176.             b = (i>>3    )*255;
  177.             g = ((i>>1)&3)*85;
  178.             r = (i&1     )*255;
  179.             break;
  180.         case AV_PIX_FMT_GRAY8:
  181.             r = b = g = i;
  182.             break;
  183.         default:
  184.             return AVERROR(EINVAL);
  185.         }
  186.         pal[i] = b + (g << 8) + (r << 16) + (0xFFU << 24);
  187.     }
  188.  
  189.     return 0;
  190. }
  191.  
  192. int av_image_alloc(uint8_t *pointers[4], int linesizes[4],
  193.                    int w, int h, enum AVPixelFormat pix_fmt, int align)
  194. {
  195.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
  196.     int i, ret;
  197.     uint8_t *buf;
  198.  
  199.     if (!desc)
  200.         return AVERROR(EINVAL);
  201.  
  202.     if ((ret = av_image_check_size(w, h, 0, NULL)) < 0)
  203.         return ret;
  204.     if ((ret = av_image_fill_linesizes(linesizes, pix_fmt, align>7 ? FFALIGN(w, 8) : w)) < 0)
  205.         return ret;
  206.  
  207.     for (i = 0; i < 4; i++)
  208.         linesizes[i] = FFALIGN(linesizes[i], align);
  209.  
  210.     if ((ret = av_image_fill_pointers(pointers, pix_fmt, h, NULL, linesizes)) < 0)
  211.         return ret;
  212.     buf = av_malloc(ret + align);
  213.     if (!buf)
  214.         return AVERROR(ENOMEM);
  215.     if ((ret = av_image_fill_pointers(pointers, pix_fmt, h, buf, linesizes)) < 0) {
  216.         av_free(buf);
  217.         return ret;
  218.     }
  219.     if (desc->flags & AV_PIX_FMT_FLAG_PAL || desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL)
  220.         avpriv_set_systematic_pal2((uint32_t*)pointers[1], pix_fmt);
  221.  
  222.     if ((desc->flags & AV_PIX_FMT_FLAG_PAL ||
  223.          desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL) &&
  224.         pointers[1] - pointers[0] > linesizes[0] * h) {
  225.         /* zero-initialize the padding before the palette */
  226.         memset(pointers[0] + linesizes[0] * h, 0,
  227.                pointers[1] - pointers[0] - linesizes[0] * h);
  228.     }
  229.  
  230.     return ret;
  231. }
  232.  
  233. typedef struct ImgUtils {
  234.     const AVClass *class;
  235.     int   log_offset;
  236.     void *log_ctx;
  237. } ImgUtils;
  238.  
  239. static const AVClass imgutils_class = { "IMGUTILS", av_default_item_name, NULL, LIBAVUTIL_VERSION_INT, offsetof(ImgUtils, log_offset), offsetof(ImgUtils, log_ctx) };
  240.  
  241. int av_image_check_size(unsigned int w, unsigned int h, int log_offset, void *log_ctx)
  242. {
  243.     ImgUtils imgutils = { &imgutils_class, log_offset, log_ctx };
  244.  
  245.     if ((int)w>0 && (int)h>0 && (w+128)*(uint64_t)(h+128) < INT_MAX/8)
  246.         return 0;
  247.  
  248.     av_log(&imgutils, AV_LOG_ERROR, "Picture size %ux%u is invalid\n", w, h);
  249.     return AVERROR(EINVAL);
  250. }
  251.  
  252. int av_image_check_sar(unsigned int w, unsigned int h, AVRational sar)
  253. {
  254.     int64_t scaled_dim;
  255.  
  256.     if (sar.den <= 0 || sar.num < 0)
  257.         return AVERROR(EINVAL);
  258.  
  259.     if (!sar.num || sar.num == sar.den)
  260.         return 0;
  261.  
  262.     if (sar.num < sar.den)
  263.         scaled_dim = av_rescale_rnd(w, sar.num, sar.den, AV_ROUND_ZERO);
  264.     else
  265.         scaled_dim = av_rescale_rnd(h, sar.den, sar.num, AV_ROUND_ZERO);
  266.  
  267.     if (scaled_dim > 0)
  268.         return 0;
  269.  
  270.     return AVERROR(EINVAL);
  271. }
  272.  
  273. void av_image_copy_plane(uint8_t       *dst, int dst_linesize,
  274.                          const uint8_t *src, int src_linesize,
  275.                          int bytewidth, int height)
  276. {
  277.     if (!dst || !src)
  278.         return;
  279.     av_assert0(abs(src_linesize) >= bytewidth);
  280.     av_assert0(abs(dst_linesize) >= bytewidth);
  281.     for (;height > 0; height--) {
  282.         memcpy(dst, src, bytewidth);
  283.         dst += dst_linesize;
  284.         src += src_linesize;
  285.     }
  286. }
  287.  
  288. void av_image_copy(uint8_t *dst_data[4], int dst_linesizes[4],
  289.                    const uint8_t *src_data[4], const int src_linesizes[4],
  290.                    enum AVPixelFormat pix_fmt, int width, int height)
  291. {
  292.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
  293.  
  294.     if (!desc || desc->flags & AV_PIX_FMT_FLAG_HWACCEL)
  295.         return;
  296.  
  297.     if (desc->flags & AV_PIX_FMT_FLAG_PAL ||
  298.         desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL) {
  299.         av_image_copy_plane(dst_data[0], dst_linesizes[0],
  300.                             src_data[0], src_linesizes[0],
  301.                             width, height);
  302.         /* copy the palette */
  303.         memcpy(dst_data[1], src_data[1], 4*256);
  304.     } else {
  305.         int i, planes_nb = 0;
  306.  
  307.         for (i = 0; i < desc->nb_components; i++)
  308.             planes_nb = FFMAX(planes_nb, desc->comp[i].plane + 1);
  309.  
  310.         for (i = 0; i < planes_nb; i++) {
  311.             int h = height;
  312.             int bwidth = av_image_get_linesize(pix_fmt, width, i);
  313.             if (bwidth < 0) {
  314.                 av_log(NULL, AV_LOG_ERROR, "av_image_get_linesize failed\n");
  315.                 return;
  316.             }
  317.             if (i == 1 || i == 2) {
  318.                 h = FF_CEIL_RSHIFT(height, desc->log2_chroma_h);
  319.             }
  320.             av_image_copy_plane(dst_data[i], dst_linesizes[i],
  321.                                 src_data[i], src_linesizes[i],
  322.                                 bwidth, h);
  323.         }
  324.     }
  325. }
  326.  
  327. int av_image_fill_arrays(uint8_t *dst_data[4], int dst_linesize[4],
  328.                          const uint8_t *src, enum AVPixelFormat pix_fmt,
  329.                          int width, int height, int align)
  330. {
  331.     int ret, i;
  332.  
  333.     ret = av_image_check_size(width, height, 0, NULL);
  334.     if (ret < 0)
  335.         return ret;
  336.  
  337.     ret = av_image_fill_linesizes(dst_linesize, pix_fmt, width);
  338.     if (ret < 0)
  339.         return ret;
  340.  
  341.     for (i = 0; i < 4; i++)
  342.         dst_linesize[i] = FFALIGN(dst_linesize[i], align);
  343.  
  344.     return av_image_fill_pointers(dst_data, pix_fmt, height, (uint8_t *)src, dst_linesize);
  345. }
  346.  
  347. int av_image_get_buffer_size(enum AVPixelFormat pix_fmt,
  348.                              int width, int height, int align)
  349. {
  350.     uint8_t *data[4];
  351.     int linesize[4];
  352.     int ret;
  353.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
  354.     if (!desc)
  355.         return AVERROR(EINVAL);
  356.  
  357.     ret = av_image_check_size(width, height, 0, NULL);
  358.     if (ret < 0)
  359.         return ret;
  360.  
  361.     // do not include palette for these pseudo-paletted formats
  362.     if (desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL)
  363.         return width * height;
  364.  
  365.     return av_image_fill_arrays(data, linesize, NULL, pix_fmt,
  366.                                 width, height, align);
  367. }
  368.  
  369. int av_image_copy_to_buffer(uint8_t *dst, int dst_size,
  370.                             const uint8_t * const src_data[4],
  371.                             const int src_linesize[4],
  372.                             enum AVPixelFormat pix_fmt,
  373.                             int width, int height, int align)
  374. {
  375.     int i, j, nb_planes = 0, linesize[4];
  376.     int size = av_image_get_buffer_size(pix_fmt, width, height, align);
  377.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
  378.  
  379.     if (size > dst_size || size < 0 || !desc)
  380.         return AVERROR(EINVAL);
  381.  
  382.     for (i = 0; i < desc->nb_components; i++)
  383.         nb_planes = FFMAX(desc->comp[i].plane, nb_planes);
  384.  
  385.     nb_planes++;
  386.  
  387.     av_image_fill_linesizes(linesize, pix_fmt, width);
  388.     for (i = 0; i < nb_planes; i++) {
  389.         int h, shift = (i == 1 || i == 2) ? desc->log2_chroma_h : 0;
  390.         const uint8_t *src = src_data[i];
  391.         h = (height + (1 << shift) - 1) >> shift;
  392.  
  393.         for (j = 0; j < h; j++) {
  394.             memcpy(dst, src, linesize[i]);
  395.             dst += FFALIGN(linesize[i], align);
  396.             src += src_linesize[i];
  397.         }
  398.     }
  399.  
  400.     if (desc->flags & AV_PIX_FMT_FLAG_PAL) {
  401.         uint32_t *d32 = (uint32_t *)(((size_t)dst + 3) & ~3);
  402.         for (i = 0; i<256; i++)
  403.             AV_WL32(d32 + i, AV_RN32(src_data[1] + 4*i));
  404.     }
  405.  
  406.     return size;
  407. }
  408.