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00024 #include "imgutils.h"
00025 #include "internal.h"
00026 #include "log.h"
00027 #include "pixdesc.h"
00028
00029 void av_image_fill_max_pixsteps(int max_pixsteps[4], int max_pixstep_comps[4],
00030 const AVPixFmtDescriptor *pixdesc)
00031 {
00032 int i;
00033 memset(max_pixsteps, 0, 4*sizeof(max_pixsteps[0]));
00034 if (max_pixstep_comps)
00035 memset(max_pixstep_comps, 0, 4*sizeof(max_pixstep_comps[0]));
00036
00037 for (i = 0; i < 4; i++) {
00038 const AVComponentDescriptor *comp = &(pixdesc->comp[i]);
00039 if ((comp->step_minus1+1) > max_pixsteps[comp->plane]) {
00040 max_pixsteps[comp->plane] = comp->step_minus1+1;
00041 if (max_pixstep_comps)
00042 max_pixstep_comps[comp->plane] = i;
00043 }
00044 }
00045 }
00046
00047 int av_image_get_linesize(enum PixelFormat pix_fmt, int width, int plane)
00048 {
00049 const AVPixFmtDescriptor *desc = &av_pix_fmt_descriptors[pix_fmt];
00050 int max_step [4];
00051 int max_step_comp[4];
00052 int s;
00053
00054 if (desc->flags & PIX_FMT_BITSTREAM)
00055 return (width * (desc->comp[0].step_minus1+1) + 7) >> 3;
00056
00057 av_image_fill_max_pixsteps(max_step, max_step_comp, desc);
00058 s = (max_step_comp[plane] == 1 || max_step_comp[plane] == 2) ? desc->log2_chroma_w : 0;
00059 return max_step[plane] * (((width + (1 << s) - 1)) >> s);
00060 }
00061
00062 int av_image_fill_linesizes(int linesizes[4], enum PixelFormat pix_fmt, int width)
00063 {
00064 int i;
00065 const AVPixFmtDescriptor *desc = &av_pix_fmt_descriptors[pix_fmt];
00066 int max_step [4];
00067 int max_step_comp[4];
00068
00069 memset(linesizes, 0, 4*sizeof(linesizes[0]));
00070
00071 if ((unsigned)pix_fmt >= PIX_FMT_NB || desc->flags & PIX_FMT_HWACCEL)
00072 return AVERROR(EINVAL);
00073
00074 if (desc->flags & PIX_FMT_BITSTREAM) {
00075 if (width > (INT_MAX -7) / (desc->comp[0].step_minus1+1))
00076 return AVERROR(EINVAL);
00077 linesizes[0] = (width * (desc->comp[0].step_minus1+1) + 7) >> 3;
00078 return 0;
00079 }
00080
00081 av_image_fill_max_pixsteps(max_step, max_step_comp, desc);
00082 for (i = 0; i < 4; i++) {
00083 int s = (max_step_comp[i] == 1 || max_step_comp[i] == 2) ? desc->log2_chroma_w : 0;
00084 int shifted_w = ((width + (1 << s) - 1)) >> s;
00085 if (max_step[i] > INT_MAX / shifted_w)
00086 return AVERROR(EINVAL);
00087 linesizes[i] = max_step[i] * shifted_w;
00088 }
00089
00090 return 0;
00091 }
00092
00093 int av_image_fill_pointers(uint8_t *data[4], enum PixelFormat pix_fmt, int height,
00094 uint8_t *ptr, const int linesizes[4])
00095 {
00096 int i, total_size, size[4], has_plane[4];
00097
00098 const AVPixFmtDescriptor *desc = &av_pix_fmt_descriptors[pix_fmt];
00099 memset(data , 0, sizeof(data[0])*4);
00100 memset(size , 0, sizeof(size));
00101 memset(has_plane, 0, sizeof(has_plane));
00102
00103 if ((unsigned)pix_fmt >= PIX_FMT_NB || desc->flags & PIX_FMT_HWACCEL)
00104 return AVERROR(EINVAL);
00105
00106 data[0] = ptr;
00107 if (linesizes[0] > (INT_MAX - 1024) / height)
00108 return AVERROR(EINVAL);
00109 size[0] = linesizes[0] * height;
00110
00111 if (desc->flags & PIX_FMT_PAL) {
00112 size[0] = (size[0] + 3) & ~3;
00113 data[1] = ptr + size[0];
00114 return size[0] + 256 * 4;
00115 }
00116
00117 for (i = 0; i < 4; i++)
00118 has_plane[desc->comp[i].plane] = 1;
00119
00120 total_size = size[0];
00121 for (i = 1; i < 4 && has_plane[i]; i++) {
00122 int h, s = (i == 1 || i == 2) ? desc->log2_chroma_h : 0;
00123 data[i] = data[i-1] + size[i-1];
00124 h = (height + (1 << s) - 1) >> s;
00125 if (linesizes[i] > INT_MAX / h)
00126 return AVERROR(EINVAL);
00127 size[i] = h * linesizes[i];
00128 if (total_size > INT_MAX - size[i])
00129 return AVERROR(EINVAL);
00130 total_size += size[i];
00131 }
00132
00133 return total_size;
00134 }
00135
00136 int ff_set_systematic_pal2(uint32_t pal[256], enum PixelFormat pix_fmt)
00137 {
00138 int i;
00139
00140 for (i = 0; i < 256; i++) {
00141 int r, g, b;
00142
00143 switch (pix_fmt) {
00144 case PIX_FMT_RGB8:
00145 r = (i>>5 )*36;
00146 g = ((i>>2)&7)*36;
00147 b = (i&3 )*85;
00148 break;
00149 case PIX_FMT_BGR8:
00150 b = (i>>6 )*85;
00151 g = ((i>>3)&7)*36;
00152 r = (i&7 )*36;
00153 break;
00154 case PIX_FMT_RGB4_BYTE:
00155 r = (i>>3 )*255;
00156 g = ((i>>1)&3)*85;
00157 b = (i&1 )*255;
00158 break;
00159 case PIX_FMT_BGR4_BYTE:
00160 b = (i>>3 )*255;
00161 g = ((i>>1)&3)*85;
00162 r = (i&1 )*255;
00163 break;
00164 case PIX_FMT_GRAY8:
00165 r = b = g = i;
00166 break;
00167 default:
00168 return AVERROR(EINVAL);
00169 }
00170 pal[i] = b + (g<<8) + (r<<16);
00171 }
00172
00173 return 0;
00174 }
00175
00176 int av_image_alloc(uint8_t *pointers[4], int linesizes[4],
00177 int w, int h, enum PixelFormat pix_fmt, int align)
00178 {
00179 int i, ret;
00180 uint8_t *buf;
00181
00182 if ((ret = av_image_check_size(w, h, 0, NULL)) < 0)
00183 return ret;
00184 if ((ret = av_image_fill_linesizes(linesizes, pix_fmt, w)) < 0)
00185 return ret;
00186
00187 for (i = 0; i < 4; i++)
00188 linesizes[i] = FFALIGN(linesizes[i], align);
00189
00190 if ((ret = av_image_fill_pointers(pointers, pix_fmt, h, NULL, linesizes)) < 0)
00191 return ret;
00192 buf = av_malloc(ret + align);
00193 if (!buf)
00194 return AVERROR(ENOMEM);
00195 if ((ret = av_image_fill_pointers(pointers, pix_fmt, h, buf, linesizes)) < 0) {
00196 av_free(buf);
00197 return ret;
00198 }
00199 if (av_pix_fmt_descriptors[pix_fmt].flags & PIX_FMT_PAL)
00200 ff_set_systematic_pal2((uint32_t*)pointers[1], pix_fmt);
00201
00202 return ret;
00203 }
00204
00205 typedef struct ImgUtils {
00206 const AVClass *class;
00207 int log_offset;
00208 void *log_ctx;
00209 } ImgUtils;
00210
00211 static const AVClass imgutils_class = { "IMGUTILS", av_default_item_name, NULL, LIBAVUTIL_VERSION_INT, offsetof(ImgUtils, log_offset), offsetof(ImgUtils, log_ctx) };
00212
00213 int av_image_check_size(unsigned int w, unsigned int h, int log_offset, void *log_ctx)
00214 {
00215 ImgUtils imgutils = { &imgutils_class, log_offset, log_ctx };
00216
00217 if ((int)w>0 && (int)h>0 && (w+128)*(uint64_t)(h+128) < INT_MAX/8)
00218 return 0;
00219
00220 av_log(&imgutils, AV_LOG_ERROR, "Picture size %ux%u is invalid\n", w, h);
00221 return AVERROR(EINVAL);
00222 }
00223
00224 void av_image_copy_plane(uint8_t *dst, int dst_linesize,
00225 const uint8_t *src, int src_linesize,
00226 int bytewidth, int height)
00227 {
00228 if (!dst || !src)
00229 return;
00230 for (;height > 0; height--) {
00231 memcpy(dst, src, bytewidth);
00232 dst += dst_linesize;
00233 src += src_linesize;
00234 }
00235 }
00236
00237 void av_image_copy(uint8_t *dst_data[4], int dst_linesizes[4],
00238 const uint8_t *src_data[4], const int src_linesizes[4],
00239 enum PixelFormat pix_fmt, int width, int height)
00240 {
00241 const AVPixFmtDescriptor *desc = &av_pix_fmt_descriptors[pix_fmt];
00242
00243 if (desc->flags & PIX_FMT_HWACCEL)
00244 return;
00245
00246 if (desc->flags & PIX_FMT_PAL) {
00247 av_image_copy_plane(dst_data[0], dst_linesizes[0],
00248 src_data[0], src_linesizes[0],
00249 width, height);
00250
00251 memcpy(dst_data[1], src_data[1], 4*256);
00252 } else {
00253 int i, planes_nb = 0;
00254
00255 for (i = 0; i < desc->nb_components; i++)
00256 planes_nb = FFMAX(planes_nb, desc->comp[i].plane + 1);
00257
00258 for (i = 0; i < planes_nb; i++) {
00259 int h = height;
00260 int bwidth = av_image_get_linesize(pix_fmt, width, i);
00261 if (i == 1 || i == 2) {
00262 h= -((-height)>>desc->log2_chroma_h);
00263 }
00264 av_image_copy_plane(dst_data[i], dst_linesizes[i],
00265 src_data[i], src_linesizes[i],
00266 bwidth, h);
00267 }
00268 }
00269 }