yading@11: /*
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: /**
yading@11:  * @file
yading@11:  * misc image utilities
yading@11:  */
yading@11: 
yading@11: #include "avassert.h"
yading@11: #include "common.h"
yading@11: #include "imgutils.h"
yading@11: #include "internal.h"
yading@11: #include "intreadwrite.h"
yading@11: #include "log.h"
yading@11: #include "pixdesc.h"
yading@11: 
yading@11: void av_image_fill_max_pixsteps(int max_pixsteps[4], int max_pixstep_comps[4],
yading@11:                                 const AVPixFmtDescriptor *pixdesc)
yading@11: {
yading@11:     int i;
yading@11:     memset(max_pixsteps, 0, 4*sizeof(max_pixsteps[0]));
yading@11:     if (max_pixstep_comps)
yading@11:         memset(max_pixstep_comps, 0, 4*sizeof(max_pixstep_comps[0]));
yading@11: 
yading@11:     for (i = 0; i < 4; i++) {
yading@11:         const AVComponentDescriptor *comp = &(pixdesc->comp[i]);
yading@11:         if ((comp->step_minus1+1) > max_pixsteps[comp->plane]) {
yading@11:             max_pixsteps[comp->plane] = comp->step_minus1+1;
yading@11:             if (max_pixstep_comps)
yading@11:                 max_pixstep_comps[comp->plane] = i;
yading@11:         }
yading@11:     }
yading@11: }
yading@11: 
yading@11: static inline
yading@11: int image_get_linesize(int width, int plane,
yading@11:                        int max_step, int max_step_comp,
yading@11:                        const AVPixFmtDescriptor *desc)
yading@11: {
yading@11:     int s, shifted_w, linesize;
yading@11: 
yading@11:     if (!desc)
yading@11:         return AVERROR(EINVAL);
yading@11: 
yading@11:     if (width < 0)
yading@11:         return AVERROR(EINVAL);
yading@11:     s = (max_step_comp == 1 || max_step_comp == 2) ? desc->log2_chroma_w : 0;
yading@11:     shifted_w = ((width + (1 << s) - 1)) >> s;
yading@11:     if (shifted_w && max_step > INT_MAX / shifted_w)
yading@11:         return AVERROR(EINVAL);
yading@11:     linesize = max_step * shifted_w;
yading@11: 
yading@11:     if (desc->flags & PIX_FMT_BITSTREAM)
yading@11:         linesize = (linesize + 7) >> 3;
yading@11:     return linesize;
yading@11: }
yading@11: 
yading@11: int av_image_get_linesize(enum AVPixelFormat pix_fmt, int width, int plane)
yading@11: {
yading@11:     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
yading@11:     int max_step     [4];       /* max pixel step for each plane */
yading@11:     int max_step_comp[4];       /* the component for each plane which has the max pixel step */
yading@11: 
yading@11:     if ((unsigned)pix_fmt >= AV_PIX_FMT_NB || desc->flags & PIX_FMT_HWACCEL)
yading@11:         return AVERROR(EINVAL);
yading@11: 
yading@11:     av_image_fill_max_pixsteps(max_step, max_step_comp, desc);
yading@11:     return image_get_linesize(width, plane, max_step[plane], max_step_comp[plane], desc);
yading@11: }
yading@11: 
yading@11: int av_image_fill_linesizes(int linesizes[4], enum AVPixelFormat pix_fmt, int width)
yading@11: {
yading@11:     int i, ret;
yading@11:     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
yading@11:     int max_step     [4];       /* max pixel step for each plane */
yading@11:     int max_step_comp[4];       /* the component for each plane which has the max pixel step */
yading@11: 
yading@11:     memset(linesizes, 0, 4*sizeof(linesizes[0]));
yading@11: 
yading@11:     if (!desc || desc->flags & PIX_FMT_HWACCEL)
yading@11:         return AVERROR(EINVAL);
yading@11: 
yading@11:     av_image_fill_max_pixsteps(max_step, max_step_comp, desc);
yading@11:     for (i = 0; i < 4; i++) {
yading@11:         if ((ret = image_get_linesize(width, i, max_step[i], max_step_comp[i], desc)) < 0)
yading@11:             return ret;
yading@11:         linesizes[i] = ret;
yading@11:     }
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: int av_image_fill_pointers(uint8_t *data[4], enum AVPixelFormat pix_fmt, int height,
yading@11:                            uint8_t *ptr, const int linesizes[4])
yading@11: {
yading@11:     int i, total_size, size[4] = { 0 }, has_plane[4] = { 0 };
yading@11: 
yading@11:     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
yading@11:     memset(data     , 0, sizeof(data[0])*4);
yading@11: 
yading@11:     if (!desc || desc->flags & PIX_FMT_HWACCEL)
yading@11:         return AVERROR(EINVAL);
yading@11: 
yading@11:     data[0] = ptr;
yading@11:     if (linesizes[0] > (INT_MAX - 1024) / height)
yading@11:         return AVERROR(EINVAL);
yading@11:     size[0] = linesizes[0] * height;
yading@11: 
yading@11:     if (desc->flags & PIX_FMT_PAL ||
yading@11:         desc->flags & PIX_FMT_PSEUDOPAL) {
yading@11:         size[0] = (size[0] + 3) & ~3;
yading@11:         data[1] = ptr + size[0]; /* palette is stored here as 256 32 bits words */
yading@11:         return size[0] + 256 * 4;
yading@11:     }
yading@11: 
yading@11:     for (i = 0; i < 4; i++)
yading@11:         has_plane[desc->comp[i].plane] = 1;
yading@11: 
yading@11:     total_size = size[0];
yading@11:     for (i = 1; i < 4 && has_plane[i]; i++) {
yading@11:         int h, s = (i == 1 || i == 2) ? desc->log2_chroma_h : 0;
yading@11:         data[i] = data[i-1] + size[i-1];
yading@11:         h = (height + (1 << s) - 1) >> s;
yading@11:         if (linesizes[i] > INT_MAX / h)
yading@11:             return AVERROR(EINVAL);
yading@11:         size[i] = h * linesizes[i];
yading@11:         if (total_size > INT_MAX - size[i])
yading@11:             return AVERROR(EINVAL);
yading@11:         total_size += size[i];
yading@11:     }
yading@11: 
yading@11:     return total_size;
yading@11: }
yading@11: 
yading@11: int avpriv_set_systematic_pal2(uint32_t pal[256], enum AVPixelFormat pix_fmt)
yading@11: {
yading@11:     int i;
yading@11: 
yading@11:     for (i = 0; i < 256; i++) {
yading@11:         int r, g, b;
yading@11: 
yading@11:         switch (pix_fmt) {
yading@11:         case AV_PIX_FMT_RGB8:
yading@11:             r = (i>>5    )*36;
yading@11:             g = ((i>>2)&7)*36;
yading@11:             b = (i&3     )*85;
yading@11:             break;
yading@11:         case AV_PIX_FMT_BGR8:
yading@11:             b = (i>>6    )*85;
yading@11:             g = ((i>>3)&7)*36;
yading@11:             r = (i&7     )*36;
yading@11:             break;
yading@11:         case AV_PIX_FMT_RGB4_BYTE:
yading@11:             r = (i>>3    )*255;
yading@11:             g = ((i>>1)&3)*85;
yading@11:             b = (i&1     )*255;
yading@11:             break;
yading@11:         case AV_PIX_FMT_BGR4_BYTE:
yading@11:             b = (i>>3    )*255;
yading@11:             g = ((i>>1)&3)*85;
yading@11:             r = (i&1     )*255;
yading@11:             break;
yading@11:         case AV_PIX_FMT_GRAY8:
yading@11:             r = b = g = i;
yading@11:             break;
yading@11:         default:
yading@11:             return AVERROR(EINVAL);
yading@11:         }
yading@11:         pal[i] = b + (g<<8) + (r<<16) + (0xFFU<<24);
yading@11:     }
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: int av_image_alloc(uint8_t *pointers[4], int linesizes[4],
yading@11:                    int w, int h, enum AVPixelFormat pix_fmt, int align)
yading@11: {
yading@11:     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
yading@11:     int i, ret;
yading@11:     uint8_t *buf;
yading@11: 
yading@11:     if (!desc)
yading@11:         return AVERROR(EINVAL);
yading@11: 
yading@11:     if ((ret = av_image_check_size(w, h, 0, NULL)) < 0)
yading@11:         return ret;
yading@11:     if ((ret = av_image_fill_linesizes(linesizes, pix_fmt, align>7 ? FFALIGN(w, 8) : w)) < 0)
yading@11:         return ret;
yading@11: 
yading@11:     for (i = 0; i < 4; i++)
yading@11:         linesizes[i] = FFALIGN(linesizes[i], align);
yading@11: 
yading@11:     if ((ret = av_image_fill_pointers(pointers, pix_fmt, h, NULL, linesizes)) < 0)
yading@11:         return ret;
yading@11:     buf = av_malloc(ret + align);
yading@11:     if (!buf)
yading@11:         return AVERROR(ENOMEM);
yading@11:     if ((ret = av_image_fill_pointers(pointers, pix_fmt, h, buf, linesizes)) < 0) {
yading@11:         av_free(buf);
yading@11:         return ret;
yading@11:     }
yading@11:     if (desc->flags & PIX_FMT_PAL || desc->flags & PIX_FMT_PSEUDOPAL)
yading@11:         avpriv_set_systematic_pal2((uint32_t*)pointers[1], pix_fmt);
yading@11: 
yading@11:     return ret;
yading@11: }
yading@11: 
yading@11: typedef struct ImgUtils {
yading@11:     const AVClass *class;
yading@11:     int   log_offset;
yading@11:     void *log_ctx;
yading@11: } ImgUtils;
yading@11: 
yading@11: static const AVClass imgutils_class = { "IMGUTILS", av_default_item_name, NULL, LIBAVUTIL_VERSION_INT, offsetof(ImgUtils, log_offset), offsetof(ImgUtils, log_ctx) };
yading@11: 
yading@11: int av_image_check_size(unsigned int w, unsigned int h, int log_offset, void *log_ctx)
yading@11: {
yading@11:     ImgUtils imgutils = { &imgutils_class, log_offset, log_ctx };
yading@11: 
yading@11:     if ((int)w>0 && (int)h>0 && (w+128)*(uint64_t)(h+128) < INT_MAX/8)
yading@11:         return 0;
yading@11: 
yading@11:     av_log(&imgutils, AV_LOG_ERROR, "Picture size %ux%u is invalid\n", w, h);
yading@11:     return AVERROR(EINVAL);
yading@11: }
yading@11: 
yading@11: void av_image_copy_plane(uint8_t       *dst, int dst_linesize,
yading@11:                          const uint8_t *src, int src_linesize,
yading@11:                          int bytewidth, int height)
yading@11: {
yading@11:     if (!dst || !src)
yading@11:         return;
yading@11:     av_assert0(abs(src_linesize) >= bytewidth);
yading@11:     av_assert0(abs(dst_linesize) >= bytewidth);
yading@11:     for (;height > 0; height--) {
yading@11:         memcpy(dst, src, bytewidth);
yading@11:         dst += dst_linesize;
yading@11:         src += src_linesize;
yading@11:     }
yading@11: }
yading@11: 
yading@11: void av_image_copy(uint8_t *dst_data[4], int dst_linesizes[4],
yading@11:                    const uint8_t *src_data[4], const int src_linesizes[4],
yading@11:                    enum AVPixelFormat pix_fmt, int width, int height)
yading@11: {
yading@11:     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
yading@11: 
yading@11:     if (!desc || desc->flags & PIX_FMT_HWACCEL)
yading@11:         return;
yading@11: 
yading@11:     if (desc->flags & PIX_FMT_PAL ||
yading@11:         desc->flags & PIX_FMT_PSEUDOPAL) {
yading@11:         av_image_copy_plane(dst_data[0], dst_linesizes[0],
yading@11:                             src_data[0], src_linesizes[0],
yading@11:                             width, height);
yading@11:         /* copy the palette */
yading@11:         memcpy(dst_data[1], src_data[1], 4*256);
yading@11:     } else {
yading@11:         int i, planes_nb = 0;
yading@11: 
yading@11:         for (i = 0; i < desc->nb_components; i++)
yading@11:             planes_nb = FFMAX(planes_nb, desc->comp[i].plane + 1);
yading@11: 
yading@11:         for (i = 0; i < planes_nb; i++) {
yading@11:             int h = height;
yading@11:             int bwidth = av_image_get_linesize(pix_fmt, width, i);
yading@11:             if (bwidth < 0) {
yading@11:                 av_log(NULL, AV_LOG_ERROR, "av_image_get_linesize failed\n");
yading@11:                 return;
yading@11:             }
yading@11:             if (i == 1 || i == 2) {
yading@11:                 h= -((-height)>>desc->log2_chroma_h);
yading@11:             }
yading@11:             av_image_copy_plane(dst_data[i], dst_linesizes[i],
yading@11:                                 src_data[i], src_linesizes[i],
yading@11:                                 bwidth, h);
yading@11:         }
yading@11:     }
yading@11: }
yading@11: 
yading@11: int av_image_fill_arrays(uint8_t *dst_data[4], int dst_linesize[4],
yading@11:                          const uint8_t *src,
yading@11:                          enum AVPixelFormat pix_fmt, int width, int height, int align)
yading@11: {
yading@11:     int ret, i;
yading@11: 
yading@11:     if ((ret = av_image_check_size(width, height, 0, NULL)) < 0)
yading@11:         return ret;
yading@11: 
yading@11:     if ((ret = av_image_fill_linesizes(dst_linesize, pix_fmt, width)) < 0)
yading@11:         return ret;
yading@11: 
yading@11:     for (i = 0; i < 4; i++)
yading@11:         dst_linesize[i] = FFALIGN(dst_linesize[i], align);
yading@11: 
yading@11:     if ((ret = av_image_fill_pointers(dst_data, pix_fmt, width, NULL, dst_linesize)) < 0)
yading@11:         return ret;
yading@11: 
yading@11:     return av_image_fill_pointers(dst_data, pix_fmt, height, (uint8_t *)src, dst_linesize);
yading@11: }
yading@11: 
yading@11: int av_image_get_buffer_size(enum AVPixelFormat pix_fmt, int width, int height, int align)
yading@11: {
yading@11:     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
yading@11:     uint8_t *data[4];
yading@11:     int linesize[4];
yading@11: 
yading@11:     if (!desc)
yading@11:         return AVERROR(EINVAL);
yading@11:     if (av_image_check_size(width, height, 0, NULL) < 0)
yading@11:         return AVERROR(EINVAL);
yading@11:     if (desc->flags & PIX_FMT_PSEUDOPAL)
yading@11:         // do not include palette for these pseudo-paletted formats
yading@11:         return width * height;
yading@11:     return av_image_fill_arrays(data, linesize, NULL, pix_fmt, width, height, align);
yading@11: }
yading@11: 
yading@11: int av_image_copy_to_buffer(uint8_t *dst, int dst_size,
yading@11:                             const uint8_t * const src_data[4], const int src_linesize[4],
yading@11:                             enum AVPixelFormat pix_fmt, int width, int height, int align)
yading@11: {
yading@11:     int i, j, nb_planes = 0, linesize[4];
yading@11:     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
yading@11:     int size = av_image_get_buffer_size(pix_fmt, width, height, align);
yading@11: 
yading@11:     if (size > dst_size || size < 0)
yading@11:         return AVERROR(EINVAL);
yading@11: 
yading@11:     for (i = 0; i < desc->nb_components; i++)
yading@11:         nb_planes = FFMAX(desc->comp[i].plane, nb_planes);
yading@11:     nb_planes++;
yading@11: 
yading@11:     av_image_fill_linesizes(linesize, pix_fmt, width);
yading@11:     for (i = 0; i < nb_planes; i++) {
yading@11:         int h, shift = (i == 1 || i == 2) ? desc->log2_chroma_h : 0;
yading@11:         const uint8_t *src = src_data[i];
yading@11:         h = (height + (1 << shift) - 1) >> shift;
yading@11: 
yading@11:         for (j = 0; j < h; j++) {
yading@11:             memcpy(dst, src, linesize[i]);
yading@11:             dst += FFALIGN(linesize[i], align);
yading@11:             src += src_linesize[i];
yading@11:         }
yading@11:     }
yading@11: 
yading@11:     if (desc->flags & PIX_FMT_PAL) {
yading@11:         uint32_t *d32 = (uint32_t *)(((size_t)dst + 3) & ~3);
yading@11:         for (i = 0; i<256; i++)
yading@11:             AV_WL32(d32 + i, AV_RN32(src_data[1] + 4*i));
yading@11:     }
yading@11: 
yading@11:     return size;
yading@11: }