diff options
Diffstat (limited to 'libavutil/imgutils.c')
| -rw-r--r-- | libavutil/imgutils.c | 297 |
1 files changed, 297 insertions, 0 deletions
diff --git a/libavutil/imgutils.c b/libavutil/imgutils.c new file mode 100644 index 0000000000..0f449ff427 --- /dev/null +++ b/libavutil/imgutils.c @@ -0,0 +1,297 @@ +/* + * 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 "libavutil/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; + } + } +} + +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 */ + int s; + + if (desc->flags & PIX_FMT_BITSTREAM) + return (width * (desc->comp[0].step_minus1+1) + 7) >> 3; + + av_image_fill_max_pixsteps(max_step, max_step_comp, desc); + s = (max_step_comp[plane] == 1 || max_step_comp[plane] == 2) ? desc->log2_chroma_w : 0; + return max_step[plane] * (((width + (1 << s) - 1)) >> s); +} + +int av_image_fill_linesizes(int linesizes[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(linesizes, 0, 4*sizeof(linesizes[0])); + + if ((unsigned)pix_fmt >= PIX_FMT_NB || desc->flags & PIX_FMT_HWACCEL) + return AVERROR(EINVAL); + + if (desc->flags & PIX_FMT_BITSTREAM) { + if (width > (INT_MAX -7) / (desc->comp[0].step_minus1+1)) + return AVERROR(EINVAL); + linesizes[0] = (width * (desc->comp[0].step_minus1+1) + 7) >> 3; + return 0; + } + + av_image_fill_max_pixsteps(max_step, max_step_comp, desc); + for (i = 0; i < 4; i++) { + int s = (max_step_comp[i] == 1 || max_step_comp[i] == 2) ? desc->log2_chroma_w : 0; + int shifted_w = ((width + (1 << s) - 1)) >> s; + if (max_step[i] > INT_MAX / shifted_w) + return AVERROR(EINVAL); + linesizes[i] = max_step[i] * shifted_w; + } + + 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 |