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278 lines
8.8 KiB
278 lines
8.8 KiB
/* |
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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 "log.h" |
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#include "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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static inline |
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int image_get_linesize(int width, int plane, |
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int max_step, int max_step_comp, |
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const AVPixFmtDescriptor *desc) |
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{ |
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int s, shifted_w, linesize; |
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if (width < 0) |
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return AVERROR(EINVAL); |
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s = (max_step_comp == 1 || max_step_comp == 2) ? desc->log2_chroma_w : 0; |
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shifted_w = ((width + (1 << s) - 1)) >> s; |
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if (shifted_w && max_step > INT_MAX / shifted_w) |
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return AVERROR(EINVAL); |
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linesize = max_step * shifted_w; |
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if (desc->flags & PIX_FMT_BITSTREAM) |
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linesize = (linesize + 7) >> 3; |
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return linesize; |
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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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if ((unsigned)pix_fmt >= PIX_FMT_NB || desc->flags & PIX_FMT_HWACCEL) |
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return AVERROR(EINVAL); |
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av_image_fill_max_pixsteps(max_step, max_step_comp, desc); |
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return image_get_linesize(width, plane, max_step[plane], max_step_comp[plane], desc); |
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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, ret; |
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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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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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if ((ret = image_get_linesize(width, i, max_step[i], max_step_comp[i], desc)) < 0) |
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return ret; |
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linesizes[i] = ret; |
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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] = { 0 }, has_plane[4] = { 0 }; |
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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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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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desc->flags & PIX_FMT_PSEUDOPAL) { |
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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; i < 4 && has_plane[i]; 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) + (0xFF<<24); |
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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, align>7 ? FFALIGN(w, 8) : 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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av_pix_fmt_descriptors[pix_fmt].flags & PIX_FMT_PSEUDOPAL) |
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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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desc->flags & PIX_FMT_PSEUDOPAL) { |
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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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}
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