| /* |
| * 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 "internal.h" |
| #include "pixdesc.h" |
| |
| void av_image_fill_max_pixsteps(int max_pixsteps[4], int max_pixstep_comps[4], |
| const AVPixFmtDescriptor *pixdesc) |
| { |
| int i; |
| memset(max_pixsteps, 0, 4*sizeof(max_pixsteps[0])); |
| if (max_pixstep_comps) |
| memset(max_pixstep_comps, 0, 4*sizeof(max_pixstep_comps[0])); |
| |
| for (i = 0; i < 4; i++) { |
| const AVComponentDescriptor *comp = &(pixdesc->comp[i]); |
| if ((comp->step_minus1+1) > max_pixsteps[comp->plane]) { |
| max_pixsteps[comp->plane] = comp->step_minus1+1; |
| if (max_pixstep_comps) |
| max_pixstep_comps[comp->plane] = i; |
| } |
| } |
| } |
| |
| static inline |
| int image_get_linesize(int width, int plane, |
| int max_step, int max_step_comp, |
| const AVPixFmtDescriptor *desc) |
| { |
| int s, shifted_w, linesize; |
| |
| if (width < 0) |
| return AVERROR(EINVAL); |
| s = (max_step_comp == 1 || max_step_comp == 2) ? desc->log2_chroma_w : 0; |
| shifted_w = ((width + (1 << s) - 1)) >> s; |
| if (shifted_w && max_step > INT_MAX / shifted_w) |
| return AVERROR(EINVAL); |
| linesize = max_step * shifted_w; |
| if (desc->flags & PIX_FMT_BITSTREAM) |
| linesize = (linesize + 7) >> 3; |
| return linesize; |
| } |
| |
| int av_image_get_linesize(enum PixelFormat pix_fmt, int width, int plane) |
| { |
| 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 */ |
| |
| if ((unsigned)pix_fmt >= PIX_FMT_NB || desc->flags & PIX_FMT_HWACCEL) |
| return AVERROR(EINVAL); |
| |
| av_image_fill_max_pixsteps(max_step, max_step_comp, desc); |
| return image_get_linesize(width, plane, max_step[plane], max_step_comp[plane], desc); |
| } |
| |
| int av_image_fill_linesizes(int linesizes[4], enum PixelFormat pix_fmt, int width) |
| { |
| int i, ret; |
| 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(linesizes, 0, 4*sizeof(linesizes[0])); |
| |
| if ((unsigned)pix_fmt >= PIX_FMT_NB || desc->flags & PIX_FMT_HWACCEL) |
| return AVERROR(EINVAL); |
| |
| av_image_fill_max_pixsteps(max_step, max_step_comp, desc); |
| for (i = 0; i < 4; i++) { |
| if ((ret = image_get_linesize(width, i, max_step[i], max_step_comp[i], desc)) < 0) |
| return ret; |
| linesizes[i] = ret; |
| } |
| |
| return 0; |
| } |
| |
| int av_image_fill_pointers(uint8_t *data[4], enum PixelFormat pix_fmt, int height, |
| uint8_t *ptr, const int linesizes[4]) |
| { |
| int i, total_size, size[4], has_plane[4]; |
| |
| const AVPixFmtDescriptor *desc = &av_pix_fmt_descriptors[pix_fmt]; |
| memset(data , 0, sizeof(data[0])*4); |
| memset(size , 0, sizeof(size)); |
| memset(has_plane, 0, sizeof(has_plane)); |
| |
| if ((unsigned)pix_fmt >= PIX_FMT_NB || desc->flags & PIX_FMT_HWACCEL) |
| return AVERROR(EINVAL); |
| |
| data[0] = ptr; |
| if (linesizes[0] > (INT_MAX - 1024) / height) |
| return AVERROR(EINVAL); |
| size[0] = linesizes[0] * height; |
| |
| if (desc->flags & PIX_FMT_PAL) { |
| size[0] = (size[0] + 3) & ~3; |
| data[1] = ptr + size[0]; /* palette is stored here as 256 32 bits words */ |
| return size[0] + 256 * 4; |
| } |
| |
| for (i = 0; i < 4; i++) |
| has_plane[desc->comp[i].plane] = 1; |
| |
| total_size = size[0]; |
| for (i = 1; has_plane[i] && i < 4; i++) { |
| int h, s = (i == 1 || i == 2) ? desc->log2_chroma_h : 0; |
| data[i] = data[i-1] + size[i-1]; |
| h = (height + (1 << s) - 1) >> s; |
| if (linesizes[i] > INT_MAX / h) |
| return AVERROR(EINVAL); |
| size[i] = h * linesizes[i]; |
| if (total_size > INT_MAX - size[i]) |
| return AVERROR(EINVAL); |
| total_size += size[i]; |
| } |
| |
| return total_size; |
| } |
| |
| int ff_set_systematic_pal2(uint32_t pal[256], enum PixelFormat pix_fmt) |
| { |
| int i; |
| |
| for (i = 0; i < 256; i++) { |
| int r, g, b; |
| |
| switch (pix_fmt) { |
| case PIX_FMT_RGB8: |
| r = (i>>5 )*36; |
| g = ((i>>2)&7)*36; |
| b = (i&3 )*85; |
| break; |
| case PIX_FMT_BGR8: |
| b = (i>>6 )*85; |
| g = ((i>>3)&7)*36; |
| r = (i&7 )*36; |
| break; |
| case PIX_FMT_RGB4_BYTE: |
| r = (i>>3 )*255; |
| g = ((i>>1)&3)*85; |
| b = (i&1 )*255; |
| break; |
| case PIX_FMT_BGR4_BYTE: |
| b = (i>>3 )*255; |
| g = ((i>>1)&3)*85; |
| r = (i&1 )*255; |
| break; |
| case PIX_FMT_GRAY8: |
| r = b = g = i; |
| break; |
| default: |
| return AVERROR(EINVAL); |
| } |
| pal[i] = b + (g<<8) + (r<<16); |
| } |
| |
| return 0; |
| } |
| |
| int av_image_alloc(uint8_t *pointers[4], int linesizes[4], |
| int w, int h, enum PixelFormat pix_fmt, int align) |
| { |
| int i, ret; |
| uint8_t *buf; |
| |
| if ((ret = av_image_check_size(w, h, 0, NULL)) < 0) |
| return ret; |
| if ((ret = av_image_fill_linesizes(linesizes, pix_fmt, w)) < 0) |
| return ret; |
| |
| for (i = 0; i < 4; i++) |
| linesizes[i] = FFALIGN(linesizes[i], align); |
| |
| if ((ret = av_image_fill_pointers(pointers, pix_fmt, h, NULL, linesizes)) < 0) |
| return ret; |
| buf = av_malloc(ret + align); |
| if (!buf) |
| return AVERROR(ENOMEM); |
| if ((ret = av_image_fill_pointers(pointers, pix_fmt, h, buf, linesizes)) < 0) { |
| av_free(buf); |
| return ret; |
| } |
| if (av_pix_fmt_descriptors[pix_fmt].flags & PIX_FMT_PAL) |
| ff_set_systematic_pal2((uint32_t*)pointers[1], pix_fmt); |
| |
| return ret; |
| } |
| |
| typedef struct ImgUtils { |
| const AVClass *class; |
| int log_offset; |
| void *log_ctx; |
| } ImgUtils; |
| |
| static const AVClass imgutils_class = { "IMGUTILS", av_default_item_name, NULL, LIBAVUTIL_VERSION_INT, offsetof(ImgUtils, log_offset), offsetof(ImgUtils, log_ctx) }; |
| |
| int av_image_check_size(unsigned int w, unsigned int h, int log_offset, void *log_ctx) |
| { |
| ImgUtils imgutils = { &imgutils_class, log_offset, log_ctx }; |
| |
| if ((int)w>0 && (int)h>0 && (w+128)*(uint64_t)(h+128) < INT_MAX/8) |
| return 0; |
| |
| av_log(&imgutils, AV_LOG_ERROR, "Picture size %ux%u is invalid\n", w, h); |
| return AVERROR(EINVAL); |
| } |
| |
| void av_image_copy_plane(uint8_t *dst, int dst_linesize, |
| const uint8_t *src, int src_linesize, |
| int bytewidth, int height) |
| { |
| if (!dst || !src) |
| return; |
| for (;height > 0; height--) { |
| memcpy(dst, src, bytewidth); |
| dst += dst_linesize; |
| src += src_linesize; |
| } |
| } |
| |
| void av_image_copy(uint8_t *dst_data[4], int dst_linesizes[4], |
| const uint8_t *src_data[4], const int src_linesizes[4], |
| enum PixelFormat pix_fmt, int width, int height) |
| { |
| const AVPixFmtDescriptor *desc = &av_pix_fmt_descriptors[pix_fmt]; |
| |
| if (desc->flags & PIX_FMT_HWACCEL) |
| return; |
| |
| if (desc->flags & PIX_FMT_PAL) { |
| av_image_copy_plane(dst_data[0], dst_linesizes[0], |
| src_data[0], src_linesizes[0], |
| width, height); |
| /* copy the palette */ |
| memcpy(dst_data[1], src_data[1], 4*256); |
| } else { |
| int i, planes_nb = 0; |
| |
| for (i = 0; i < desc->nb_components; i++) |
| planes_nb = FFMAX(planes_nb, desc->comp[i].plane + 1); |
| |
| for (i = 0; i < planes_nb; i++) { |
| int h = height; |
| int bwidth = av_image_get_linesize(pix_fmt, width, i); |
| if (i == 1 || i == 2) { |
| h= -((-height)>>desc->log2_chroma_h); |
| } |
| av_image_copy_plane(dst_data[i], dst_linesizes[i], |
| src_data[i], src_linesizes[i], |
| bwidth, h); |
| } |
| } |
| } |
| |
| #if FF_API_OLD_IMAGE_NAMES |
| void av_fill_image_max_pixsteps(int max_pixsteps[4], int max_pixstep_comps[4], |
| const AVPixFmtDescriptor *pixdesc) |
| { |
| av_image_fill_max_pixsteps(max_pixsteps, max_pixstep_comps, pixdesc); |
| } |
| |
| int av_get_image_linesize(enum PixelFormat pix_fmt, int width, int plane) |
| { |
| return av_image_get_linesize(pix_fmt, width, plane); |
| } |
| |
| int av_fill_image_linesizes(int linesizes[4], enum PixelFormat pix_fmt, int width) |
| { |
| return av_image_fill_linesizes(linesizes, pix_fmt, width); |
| } |
| |
| int av_fill_image_pointers(uint8_t *data[4], enum PixelFormat pix_fmt, int height, |
| uint8_t *ptr, const int linesizes[4]) |
| { |
| return av_image_fill_pointers(data, pix_fmt, height, ptr, linesizes); |
| } |
| |
| int av_check_image_size(unsigned int w, unsigned int h, int log_offset, void *log_ctx) |
| { |
| return av_image_check_size(w, h, log_offset, log_ctx); |
| } |
| #endif |
