FFmpeg: libavcodec/imgconvert.c Source File

00001 /*
00002  * Misc image conversion routines
00003  * Copyright (c) 2001, 2002, 2003 Fabrice Bellard
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00027 /* TODO:
00028  * - write 'ffimg' program to test all the image related stuff
00029  * - move all api to slice based system
00030  * - integrate deinterlacing, postprocessing and scaling in the conversion process
00031  */
00032 
00033 #include "avcodec.h"
00034 #include "dsputil.h"
00035 #include "internal.h"
00036 #include "libavutil/avassert.h"
00037 #include "libavutil/colorspace.h"
00038 #include "libavutil/common.h"
00039 #include "libavutil/pixdesc.h"
00040 #include "libavutil/imgutils.h"
00041 
00042 #if HAVE_MMX_EXTERNAL
00043 #include "x86/dsputil_mmx.h"
00044 #endif
00045 
00046 #define FF_COLOR_NA      -1
00047 #define FF_COLOR_RGB      0 
00048 #define FF_COLOR_GRAY     1 
00049 #define FF_COLOR_YUV      2 
00050 #define FF_COLOR_YUV_JPEG 3 
00052 #if HAVE_MMX_EXTERNAL
00053 #define deinterlace_line_inplace ff_deinterlace_line_inplace_mmx
00054 #define deinterlace_line         ff_deinterlace_line_mmx
00055 #else
00056 #define deinterlace_line_inplace deinterlace_line_inplace_c
00057 #define deinterlace_line         deinterlace_line_c
00058 #endif
00059 
00060 #define pixdesc_has_alpha(pixdesc) \
00061     ((pixdesc)->nb_components == 2 || (pixdesc)->nb_components == 4 || (pixdesc)->flags & PIX_FMT_PAL)
00062 
00063 
00064 void avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift)
00065 {
00066     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
00067     av_assert0(desc);
00068     *h_shift = desc->log2_chroma_w;
00069     *v_shift = desc->log2_chroma_h;
00070 }
00071 
00072 static get_color_type(AVPixFmtDescriptor *desc) {
00073     if(desc->nb_components == 1 || desc->nb_components == 2)
00074         return FF_COLOR_GRAY;
00075 
00076     if(desc->name && !strncmp(desc->name, "yuvj", 4))
00077         return FF_COLOR_YUV_JPEG;
00078 
00079     if(desc->flags & PIX_FMT_RGB)
00080         return  FF_COLOR_RGB;
00081 
00082     if(desc->nb_components == 0)
00083         return FF_COLOR_NA;
00084 
00085     return FF_COLOR_YUV;
00086 }
00087 
00088 static int get_pix_fmt_depth(int *min, int *max, enum AVPixelFormat pix_fmt)
00089 {
00090     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
00091     int i;
00092 
00093     if (!desc || !desc->nb_components) {
00094         *min = *max = 0;
00095         return AVERROR(EINVAL);
00096     }
00097 
00098     *min = INT_MAX, *max = -INT_MAX;
00099     for (i = 0; i < desc->nb_components; i++) {
00100         *min = FFMIN(desc->comp[i].depth_minus1+1, *min);
00101         *max = FFMAX(desc->comp[i].depth_minus1+1, *max);
00102     }
00103     return 0;
00104 }
00105 
00106 int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt,
00107                              enum AVPixelFormat src_pix_fmt,
00108                              int has_alpha)
00109 {
00110     const AVPixFmtDescriptor *src_desc = av_pix_fmt_desc_get(src_pix_fmt);
00111     const AVPixFmtDescriptor *dst_desc = av_pix_fmt_desc_get(dst_pix_fmt);
00112     int src_color, dst_color;
00113     int src_min_depth, src_max_depth, dst_min_depth, dst_max_depth;
00114     int ret, loss, i, nb_components;
00115 
00116     if (dst_pix_fmt >= AV_PIX_FMT_NB || dst_pix_fmt <= AV_PIX_FMT_NONE)
00117         return ~0;
00118 
00119     /* compute loss */
00120     loss = 0;
00121 
00122     if (dst_pix_fmt == src_pix_fmt)
00123         return 0;
00124 
00125     if ((ret = get_pix_fmt_depth(&src_min_depth, &src_max_depth, src_pix_fmt)) < 0)
00126         return ret;
00127     if ((ret = get_pix_fmt_depth(&dst_min_depth, &dst_max_depth, dst_pix_fmt)) < 0)
00128         return ret;
00129 
00130     src_color = get_color_type(src_desc);
00131     dst_color = get_color_type(dst_desc);
00132     nb_components = FFMIN(src_desc->nb_components, dst_desc->nb_components);
00133 
00134     for (i = 0; i < nb_components; i++)
00135         if (src_desc->comp[i].depth_minus1 > dst_desc->comp[i].depth_minus1)
00136             loss |= FF_LOSS_DEPTH;
00137 
00138     if (dst_desc->log2_chroma_w > src_desc->log2_chroma_w ||
00139         dst_desc->log2_chroma_h > src_desc->log2_chroma_h)
00140         loss |= FF_LOSS_RESOLUTION;
00141 
00142     switch(dst_color) {
00143     case FF_COLOR_RGB:
00144         if (src_color != FF_COLOR_RGB &&
00145             src_color != FF_COLOR_GRAY)
00146             loss |= FF_LOSS_COLORSPACE;
00147         break;
00148     case FF_COLOR_GRAY:
00149         if (src_color != FF_COLOR_GRAY)
00150             loss |= FF_LOSS_COLORSPACE;
00151         break;
00152     case FF_COLOR_YUV:
00153         if (src_color != FF_COLOR_YUV)
00154             loss |= FF_LOSS_COLORSPACE;
00155         break;
00156     case FF_COLOR_YUV_JPEG:
00157         if (src_color != FF_COLOR_YUV_JPEG &&
00158             src_color != FF_COLOR_YUV &&
00159             src_color != FF_COLOR_GRAY)
00160             loss |= FF_LOSS_COLORSPACE;
00161         break;
00162     default:
00163         /* fail safe test */
00164         if (src_color != dst_color)
00165             loss |= FF_LOSS_COLORSPACE;
00166         break;
00167     }
00168     if (dst_color == FF_COLOR_GRAY &&
00169         src_color != FF_COLOR_GRAY)
00170         loss |= FF_LOSS_CHROMA;
00171     if (!pixdesc_has_alpha(dst_desc) && (pixdesc_has_alpha(src_desc) && has_alpha))
00172         loss |= FF_LOSS_ALPHA;
00173     if (dst_pix_fmt == AV_PIX_FMT_PAL8 &&
00174         (src_pix_fmt != AV_PIX_FMT_PAL8 && (src_color != FF_COLOR_GRAY || (pixdesc_has_alpha(src_desc) && has_alpha))))
00175         loss |= FF_LOSS_COLORQUANT;
00176 
00177     return loss;
00178 }
00179 
00180 #if FF_API_FIND_BEST_PIX_FMT
00181 enum AVPixelFormat avcodec_find_best_pix_fmt(int64_t pix_fmt_mask, enum AVPixelFormat src_pix_fmt,
00182                                             int has_alpha, int *loss_ptr)
00183 {
00184     enum AVPixelFormat dst_pix_fmt;
00185     int i;
00186 
00187     if (loss_ptr) /* all losses count (for backward compatibility) */
00188         *loss_ptr = 0;
00189 
00190     dst_pix_fmt = AV_PIX_FMT_NONE; /* so first iteration doesn't have to be treated special */
00191     for(i = 0; i< FFMIN(AV_PIX_FMT_NB, 64); i++){
00192         if (pix_fmt_mask & (1ULL << i))
00193             dst_pix_fmt = avcodec_find_best_pix_fmt_of_2(dst_pix_fmt, i, src_pix_fmt, has_alpha, loss_ptr);
00194     }
00195     return dst_pix_fmt;
00196 }
00197 #endif /* FF_API_FIND_BEST_PIX_FMT */
00198 
00199 enum AVPixelFormat avcodec_find_best_pix_fmt_of_2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
00200                                             enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr)
00201 {
00202     enum AVPixelFormat dst_pix_fmt;
00203     int loss1, loss2, loss_order1, loss_order2, i, loss_mask;
00204     const AVPixFmtDescriptor *desc1 = av_pix_fmt_desc_get(dst_pix_fmt1);
00205     const AVPixFmtDescriptor *desc2 = av_pix_fmt_desc_get(dst_pix_fmt2);
00206     static const int loss_mask_order[] = {
00207         ~0, /* no loss first */
00208         ~FF_LOSS_ALPHA,
00209         ~FF_LOSS_RESOLUTION,
00210         ~FF_LOSS_COLORSPACE,
00211         ~(FF_LOSS_COLORSPACE | FF_LOSS_RESOLUTION),
00212         ~FF_LOSS_COLORQUANT,
00213         ~FF_LOSS_DEPTH,
00214         ~(FF_LOSS_DEPTH|FF_LOSS_COLORSPACE),
00215         ~(FF_LOSS_RESOLUTION | FF_LOSS_DEPTH | FF_LOSS_COLORSPACE | FF_LOSS_ALPHA |
00216           FF_LOSS_COLORQUANT | FF_LOSS_CHROMA),
00217         0x80000, //non zero entry that combines all loss variants including future additions
00218         0,
00219     };
00220 
00221     loss_mask= loss_ptr?~*loss_ptr:~0; /* use loss mask if provided */
00222     dst_pix_fmt = AV_PIX_FMT_NONE;
00223     loss1 = avcodec_get_pix_fmt_loss(dst_pix_fmt1, src_pix_fmt, has_alpha) & loss_mask;
00224     loss2 = avcodec_get_pix_fmt_loss(dst_pix_fmt2, src_pix_fmt, has_alpha) & loss_mask;
00225 
00226     /* try with successive loss */
00227     for(i = 0;loss_mask_order[i] != 0 && dst_pix_fmt == AV_PIX_FMT_NONE;i++) {
00228         loss_order1 = loss1 & loss_mask_order[i];
00229         loss_order2 = loss2 & loss_mask_order[i];
00230 
00231         if (loss_order1 == 0 && loss_order2 == 0 && dst_pix_fmt2 != AV_PIX_FMT_NONE && dst_pix_fmt1 != AV_PIX_FMT_NONE){ /* use format with smallest depth */
00232             if(av_get_padded_bits_per_pixel(desc2) != av_get_padded_bits_per_pixel(desc1)) {
00233                 dst_pix_fmt = av_get_padded_bits_per_pixel(desc2) < av_get_padded_bits_per_pixel(desc1) ? dst_pix_fmt2 : dst_pix_fmt1;
00234             } else {
00235                 dst_pix_fmt = desc2->nb_components < desc1->nb_components ? dst_pix_fmt2 : dst_pix_fmt1;
00236             }
00237         } else if (loss_order1 == 0 || loss_order2 == 0) { /* use format with no loss */
00238             dst_pix_fmt = loss_order2 ? dst_pix_fmt1 : dst_pix_fmt2;
00239         }
00240     }
00241 
00242     if (loss_ptr)
00243         *loss_ptr = avcodec_get_pix_fmt_loss(dst_pix_fmt, src_pix_fmt, has_alpha);
00244     return dst_pix_fmt;
00245 }
00246 
00247 #if AV_HAVE_INCOMPATIBLE_FORK_ABI
00248 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat *pix_fmt_list,
00249                                             enum AVPixelFormat src_pix_fmt,
00250                                             int has_alpha, int *loss_ptr){
00251     return avcodec_find_best_pix_fmt_of_list(pix_fmt_list, src_pix_fmt, has_alpha, loss_ptr);
00252 }
00253 #else
00254 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
00255                                             enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr)
00256 {
00257     return avcodec_find_best_pix_fmt_of_2(dst_pix_fmt1, dst_pix_fmt2, src_pix_fmt, has_alpha, loss_ptr);
00258 }
00259 #endif
00260 
00261 enum AVPixelFormat avcodec_find_best_pix_fmt_of_list(enum AVPixelFormat *pix_fmt_list,
00262                                             enum AVPixelFormat src_pix_fmt,
00263                                             int has_alpha, int *loss_ptr){
00264     int i;
00265 
00266     enum AVPixelFormat best = AV_PIX_FMT_NONE;
00267 
00268     for(i=0; pix_fmt_list[i] != AV_PIX_FMT_NONE; i++)
00269         best = avcodec_find_best_pix_fmt_of_2(best, pix_fmt_list[i], src_pix_fmt, has_alpha, loss_ptr);
00270 
00271     return best;
00272 }
00273 
00274 /* 2x2 -> 1x1 */
00275 void ff_shrink22(uint8_t *dst, int dst_wrap,
00276                      const uint8_t *src, int src_wrap,
00277                      int width, int height)
00278 {
00279     int w;
00280     const uint8_t *s1, *s2;
00281     uint8_t *d;
00282 
00283     for(;height > 0; height--) {
00284         s1 = src;
00285         s2 = s1 + src_wrap;
00286         d = dst;
00287         for(w = width;w >= 4; w-=4) {
00288             d[0] = (s1[0] + s1[1] + s2[0] + s2[1] + 2) >> 2;
00289             d[1] = (s1[2] + s1[3] + s2[2] + s2[3] + 2) >> 2;
00290             d[2] = (s1[4] + s1[5] + s2[4] + s2[5] + 2) >> 2;
00291             d[3] = (s1[6] + s1[7] + s2[6] + s2[7] + 2) >> 2;
00292             s1 += 8;
00293             s2 += 8;
00294             d += 4;
00295         }
00296         for(;w > 0; w--) {
00297             d[0] = (s1[0] + s1[1] + s2[0] + s2[1] + 2) >> 2;
00298             s1 += 2;
00299             s2 += 2;
00300             d++;
00301         }
00302         src += 2 * src_wrap;
00303         dst += dst_wrap;
00304     }
00305 }
00306 
00307 /* 4x4 -> 1x1 */
00308 void ff_shrink44(uint8_t *dst, int dst_wrap,
00309                      const uint8_t *src, int src_wrap,
00310                      int width, int height)
00311 {
00312     int w;
00313     const uint8_t *s1, *s2, *s3, *s4;
00314     uint8_t *d;
00315 
00316     for(;height > 0; height--) {
00317         s1 = src;
00318         s2 = s1 + src_wrap;
00319         s3 = s2 + src_wrap;
00320         s4 = s3 + src_wrap;
00321         d = dst;
00322         for(w = width;w > 0; w--) {
00323             d[0] = (s1[0] + s1[1] + s1[2] + s1[3] +
00324                     s2[0] + s2[1] + s2[2] + s2[3] +
00325                     s3[0] + s3[1] + s3[2] + s3[3] +
00326                     s4[0] + s4[1] + s4[2] + s4[3] + 8) >> 4;
00327             s1 += 4;
00328             s2 += 4;
00329             s3 += 4;
00330             s4 += 4;
00331             d++;
00332         }
00333         src += 4 * src_wrap;
00334         dst += dst_wrap;
00335     }
00336 }
00337 
00338 /* 8x8 -> 1x1 */
00339 void ff_shrink88(uint8_t *dst, int dst_wrap,
00340                      const uint8_t *src, int src_wrap,
00341                      int width, int height)
00342 {
00343     int w, i;
00344 
00345     for(;height > 0; height--) {
00346         for(w = width;w > 0; w--) {
00347             int tmp=0;
00348             for(i=0; i<8; i++){
00349                 tmp += src[0] + src[1] + src[2] + src[3] + src[4] + src[5] + src[6] + src[7];
00350                 src += src_wrap;
00351             }
00352             *(dst++) = (tmp + 32)>>6;
00353             src += 8 - 8*src_wrap;
00354         }
00355         src += 8*src_wrap - 8*width;
00356         dst += dst_wrap - width;
00357     }
00358 }
00359 
00360 /* return true if yuv planar */
00361 static inline int is_yuv_planar(const AVPixFmtDescriptor *desc)
00362 {
00363     int i;
00364     int planes[4] = { 0 };
00365 
00366     if (     desc->flags & PIX_FMT_RGB
00367         || !(desc->flags & PIX_FMT_PLANAR))
00368         return 0;
00369 
00370     /* set the used planes */
00371     for (i = 0; i < desc->nb_components; i++)
00372         planes[desc->comp[i].plane] = 1;
00373 
00374     /* if there is an unused plane, the format is not planar */
00375     for (i = 0; i < desc->nb_components; i++)
00376         if (!planes[i])
00377             return 0;
00378     return 1;
00379 }
00380 
00381 int av_picture_crop(AVPicture *dst, const AVPicture *src,
00382                     enum AVPixelFormat pix_fmt, int top_band, int left_band)
00383 {
00384     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
00385     int y_shift;
00386     int x_shift;
00387 
00388     if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)
00389         return -1;
00390 
00391     y_shift = desc->log2_chroma_h;
00392     x_shift = desc->log2_chroma_w;
00393 
00394     if (is_yuv_planar(desc)) {
00395     dst->data[0] = src->data[0] + (top_band * src->linesize[0]) + left_band;
00396     dst->data[1] = src->data[1] + ((top_band >> y_shift) * src->linesize[1]) + (left_band >> x_shift);
00397     dst->data[2] = src->data[2] + ((top_band >> y_shift) * src->linesize[2]) + (left_band >> x_shift);
00398     } else{
00399         if(top_band % (1<<y_shift) || left_band % (1<<x_shift))
00400             return -1;
00401         if(left_band) //FIXME add support for this too
00402             return -1;
00403         dst->data[0] = src->data[0] + (top_band * src->linesize[0]) + left_band;
00404     }
00405 
00406     dst->linesize[0] = src->linesize[0];
00407     dst->linesize[1] = src->linesize[1];
00408     dst->linesize[2] = src->linesize[2];
00409     return 0;
00410 }
00411 
00412 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width,
00413                    enum AVPixelFormat pix_fmt, int padtop, int padbottom, int padleft, int padright,
00414             int *color)
00415 {
00416     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
00417     uint8_t *optr;
00418     int y_shift;
00419     int x_shift;
00420     int yheight;
00421     int i, y;
00422 
00423     if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB ||
00424         !is_yuv_planar(desc)) return -1;
00425 
00426     for (i = 0; i < 3; i++) {
00427         x_shift = i ? desc->log2_chroma_w : 0;
00428         y_shift = i ? desc->log2_chroma_h : 0;
00429 
00430         if (padtop || padleft) {
00431             memset(dst->data[i], color[i],
00432                 dst->linesize[i] * (padtop >> y_shift) + (padleft >> x_shift));
00433         }
00434 
00435         if (padleft || padright) {
00436             optr = dst->data[i] + dst->linesize[i] * (padtop >> y_shift) +
00437                 (dst->linesize[i] - (padright >> x_shift));
00438             yheight = (height - 1 - (padtop + padbottom)) >> y_shift;
00439             for (y = 0; y < yheight; y++) {
00440                 memset(optr, color[i], (padleft + padright) >> x_shift);
00441                 optr += dst->linesize[i];
00442             }
00443         }
00444 
00445         if (src) { /* first line */
00446             uint8_t *iptr = src->data[i];
00447             optr = dst->data[i] + dst->linesize[i] * (padtop >> y_shift) +
00448                     (padleft >> x_shift);
00449             memcpy(optr, iptr, (width - padleft - padright) >> x_shift);
00450             iptr += src->linesize[i];
00451             optr = dst->data[i] + dst->linesize[i] * (padtop >> y_shift) +
00452                 (dst->linesize[i] - (padright >> x_shift));
00453             yheight = (height - 1 - (padtop + padbottom)) >> y_shift;
00454             for (y = 0; y < yheight; y++) {
00455                 memset(optr, color[i], (padleft + padright) >> x_shift);
00456                 memcpy(optr + ((padleft + padright) >> x_shift), iptr,
00457                        (width - padleft - padright) >> x_shift);
00458                 iptr += src->linesize[i];
00459                 optr += dst->linesize[i];
00460             }
00461         }
00462 
00463         if (padbottom || padright) {
00464             optr = dst->data[i] + dst->linesize[i] *
00465                 ((height - padbottom) >> y_shift) - (padright >> x_shift);
00466             memset(optr, color[i],dst->linesize[i] *
00467                 (padbottom >> y_shift) + (padright >> x_shift));
00468         }
00469     }
00470     return 0;
00471 }
00472 
00473 #if !HAVE_MMX_EXTERNAL
00474 /* filter parameters: [-1 4 2 4 -1] // 8 */
00475 static void deinterlace_line_c(uint8_t *dst,
00476                              const uint8_t *lum_m4, const uint8_t *lum_m3,
00477                              const uint8_t *lum_m2, const uint8_t *lum_m1,
00478                              const uint8_t *lum,
00479                              int size)
00480 {
00481     uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
00482     int sum;
00483 
00484     for(;size > 0;size--) {
00485         sum = -lum_m4[0];
00486         sum += lum_m3[0] << 2;
00487         sum += lum_m2[0] << 1;
00488         sum += lum_m1[0] << 2;
00489         sum += -lum[0];
00490         dst[0] = cm[(sum + 4) >> 3];
00491         lum_m4++;
00492         lum_m3++;
00493         lum_m2++;
00494         lum_m1++;
00495         lum++;
00496         dst++;
00497     }
00498 }
00499 
00500 static void deinterlace_line_inplace_c(uint8_t *lum_m4, uint8_t *lum_m3,
00501                                        uint8_t *lum_m2, uint8_t *lum_m1,
00502                                        uint8_t *lum, int size)
00503 {
00504     uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
00505     int sum;
00506 
00507     for(;size > 0;size--) {
00508         sum = -lum_m4[0];
00509         sum += lum_m3[0] << 2;
00510         sum += lum_m2[0] << 1;
00511         lum_m4[0]=lum_m2[0];
00512         sum += lum_m1[0] << 2;
00513         sum += -lum[0];
00514         lum_m2[0] = cm[(sum + 4) >> 3];
00515         lum_m4++;
00516         lum_m3++;
00517         lum_m2++;
00518         lum_m1++;
00519         lum++;
00520     }
00521 }
00522 #endif /* !HAVE_MMX_EXTERNAL */
00523 
00524 /* deinterlacing : 2 temporal taps, 3 spatial taps linear filter. The
00525    top field is copied as is, but the bottom field is deinterlaced
00526    against the top field. */
00527 static void deinterlace_bottom_field(uint8_t *dst, int dst_wrap,
00528                                     const uint8_t *src1, int src_wrap,
00529                                     int width, int height)
00530 {
00531     const uint8_t *src_m2, *src_m1, *src_0, *src_p1, *src_p2;
00532     int y;
00533 
00534     src_m2 = src1;
00535     src_m1 = src1;
00536     src_0=&src_m1[src_wrap];
00537     src_p1=&src_0[src_wrap];
00538     src_p2=&src_p1[src_wrap];
00539     for(y=0;y<(height-2);y+=2) {
00540         memcpy(dst,src_m1,width);
00541         dst += dst_wrap;
00542         deinterlace_line(dst,src_m2,src_m1,src_0,src_p1,src_p2,width);
00543         src_m2 = src_0;
00544         src_m1 = src_p1;
00545         src_0 = src_p2;
00546         src_p1 += 2*src_wrap;
00547         src_p2 += 2*src_wrap;
00548         dst += dst_wrap;
00549     }
00550     memcpy(dst,src_m1,width);
00551     dst += dst_wrap;
00552     /* do last line */
00553     deinterlace_line(dst,src_m2,src_m1,src_0,src_0,src_0,width);
00554 }
00555 
00556 static void deinterlace_bottom_field_inplace(uint8_t *src1, int src_wrap,
00557                                              int width, int height)
00558 {
00559     uint8_t *src_m1, *src_0, *src_p1, *src_p2;
00560     int y;
00561     uint8_t *buf;
00562     buf = av_malloc(width);
00563 
00564     src_m1 = src1;
00565     memcpy(buf,src_m1,width);
00566     src_0=&src_m1[src_wrap];
00567     src_p1=&src_0[src_wrap];
00568     src_p2=&src_p1[src_wrap];
00569     for(y=0;y<(height-2);y+=2) {
00570         deinterlace_line_inplace(buf,src_m1,src_0,src_p1,src_p2,width);
00571         src_m1 = src_p1;
00572         src_0 = src_p2;
00573         src_p1 += 2*src_wrap;
00574         src_p2 += 2*src_wrap;
00575     }
00576     /* do last line */
00577     deinterlace_line_inplace(buf,src_m1,src_0,src_0,src_0,width);
00578     av_free(buf);
00579 }
00580 
00581 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
00582                           enum AVPixelFormat pix_fmt, int width, int height)
00583 {
00584     int i;
00585 
00586     if (pix_fmt != AV_PIX_FMT_YUV420P &&
00587         pix_fmt != AV_PIX_FMT_YUVJ420P &&
00588         pix_fmt != AV_PIX_FMT_YUV422P &&
00589         pix_fmt != AV_PIX_FMT_YUVJ422P &&
00590         pix_fmt != AV_PIX_FMT_YUV444P &&
00591         pix_fmt != AV_PIX_FMT_YUV411P &&
00592         pix_fmt != AV_PIX_FMT_GRAY8)
00593         return -1;
00594     if ((width & 3) != 0 || (height & 3) != 0)
00595         return -1;
00596 
00597     for(i=0;i<3;i++) {
00598         if (i == 1) {
00599             switch(pix_fmt) {
00600             case AV_PIX_FMT_YUVJ420P:
00601             case AV_PIX_FMT_YUV420P:
00602                 width >>= 1;
00603                 height >>= 1;
00604                 break;
00605             case AV_PIX_FMT_YUV422P:
00606             case AV_PIX_FMT_YUVJ422P:
00607                 width >>= 1;
00608                 break;
00609             case AV_PIX_FMT_YUV411P:
00610                 width >>= 2;
00611                 break;
00612             default:
00613                 break;
00614             }
00615             if (pix_fmt == AV_PIX_FMT_GRAY8) {
00616                 break;
00617             }
00618         }
00619         if (src == dst) {
00620             deinterlace_bottom_field_inplace(dst->data[i], dst->linesize[i],
00621                                  width, height);
00622         } else {
00623             deinterlace_bottom_field(dst->data[i],dst->linesize[i],
00624                                         src->data[i], src->linesize[i],
00625                                         width, height);
00626         }
00627     }
00628     emms_c();
00629     return 0;
00630 }
00631 
00632 #ifdef TEST
00633 
00634 int main(void){
00635     int i;
00636     int err=0;
00637     int skip = 0;
00638 
00639     for (i=0; i<AV_PIX_FMT_NB*2; i++) {
00640         AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(i);
00641         if(!desc || !desc->name) {
00642             skip ++;
00643             continue;
00644         }
00645         if (skip) {
00646             av_log(NULL, AV_LOG_INFO, "%3d unused pixel format values\n", skip);
00647             skip = 0;
00648         }
00649         av_log(NULL, AV_LOG_INFO, "pix fmt %s yuv_plan:%d avg_bpp:%d colortype:%d\n", desc->name, is_yuv_planar(desc), av_get_padded_bits_per_pixel(desc), get_color_type(desc));
00650         if ((!(desc->flags & PIX_FMT_ALPHA)) != (desc->nb_components != 2 && desc->nb_components != 4)) {
00651             av_log(NULL, AV_LOG_ERROR, "Alpha flag mismatch\n");
00652             err = 1;
00653         }
00654     }
00655     return err;
00656 }
00657 
00658 #endif