2 * Misc image conversion routines
3 * Copyright (c) 2001, 2002, 2003 Fabrice Bellard
5 * This file is part of Libav.
7 * Libav is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * Libav is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 * misc image conversion routines
28 * - write 'ffimg' program to test all the image related stuff
29 * - move all api to slice based system
30 * - integrate deinterlacing, postprocessing and scaling in the conversion process
36 #include "libavutil/colorspace.h"
37 #include "libavutil/common.h"
38 #include "libavutil/pixdesc.h"
39 #include "libavutil/imgutils.h"
42 #include "x86/dsputil_mmx.h"
46 #define deinterlace_line_inplace ff_deinterlace_line_inplace_mmx
47 #define deinterlace_line ff_deinterlace_line_mmx
49 #define deinterlace_line_inplace deinterlace_line_inplace_c
50 #define deinterlace_line deinterlace_line_c
53 void avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift)
55 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
56 *h_shift = desc->log2_chroma_w;
57 *v_shift = desc->log2_chroma_h;
60 static int is_gray(const AVPixFmtDescriptor *desc)
62 return desc->nb_components - (desc->flags & PIX_FMT_ALPHA) == 1;
65 int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt,
66 enum AVPixelFormat src_pix_fmt,
69 const AVPixFmtDescriptor *src_desc = av_pix_fmt_desc_get(src_pix_fmt);
70 const AVPixFmtDescriptor *dst_desc = av_pix_fmt_desc_get(dst_pix_fmt);
71 int loss, i, nb_components = FFMIN(src_desc->nb_components,
72 dst_desc->nb_components);
77 if (dst_pix_fmt == src_pix_fmt)
80 for (i = 0; i < nb_components; i++)
81 if (src_desc->comp[i].depth_minus1 > dst_desc->comp[i].depth_minus1)
82 loss |= FF_LOSS_DEPTH;
84 if (dst_desc->log2_chroma_w > src_desc->log2_chroma_w ||
85 dst_desc->log2_chroma_h > src_desc->log2_chroma_h)
86 loss |= FF_LOSS_RESOLUTION;
88 if ((src_desc->flags & PIX_FMT_RGB) != (dst_desc->flags & PIX_FMT_RGB))
89 loss |= FF_LOSS_COLORSPACE;
91 if (has_alpha && !(dst_desc->flags & PIX_FMT_ALPHA) &&
92 (dst_desc->flags & PIX_FMT_ALPHA))
93 loss |= FF_LOSS_ALPHA;
95 if (dst_pix_fmt == AV_PIX_FMT_PAL8 && !is_gray(src_desc))
96 return loss | FF_LOSS_COLORQUANT;
98 if (src_desc->nb_components > dst_desc->nb_components)
99 if (is_gray(dst_desc))
100 loss |= FF_LOSS_CHROMA;
105 static enum AVPixelFormat avcodec_find_best_pix_fmt1(enum AVPixelFormat *pix_fmt_list,
106 enum AVPixelFormat src_pix_fmt,
110 int dist, i, loss, min_dist;
111 enum AVPixelFormat dst_pix_fmt;
113 /* find exact color match with smallest size */
114 dst_pix_fmt = AV_PIX_FMT_NONE;
115 min_dist = 0x7fffffff;
117 while (pix_fmt_list[i] != AV_PIX_FMT_NONE) {
118 enum AVPixelFormat pix_fmt = pix_fmt_list[i];
120 if (i > AV_PIX_FMT_NB) {
121 av_log(NULL, AV_LOG_ERROR, "Pixel format list longer than expected, "
122 "it is either not properly terminated or contains duplicates\n");
123 return AV_PIX_FMT_NONE;
126 loss = avcodec_get_pix_fmt_loss(pix_fmt, src_pix_fmt, has_alpha) & loss_mask;
128 dist = av_get_bits_per_pixel(av_pix_fmt_desc_get(pix_fmt));
129 if (dist < min_dist) {
131 dst_pix_fmt = pix_fmt;
139 #if FF_API_FIND_BEST_PIX_FMT
140 enum AVPixelFormat avcodec_find_best_pix_fmt(int64_t pix_fmt_mask, enum AVPixelFormat src_pix_fmt,
141 int has_alpha, int *loss_ptr)
143 enum AVPixelFormat list[64];
146 // test only the first 64 pixel formats to avoid undefined behaviour
147 for (i = 0; i < 64; i++) {
148 if (pix_fmt_mask & (1ULL << i))
151 list[j] = AV_PIX_FMT_NONE;
153 return avcodec_find_best_pix_fmt2(list, src_pix_fmt, has_alpha, loss_ptr);
155 #endif /* FF_API_FIND_BEST_PIX_FMT */
157 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat *pix_fmt_list,
158 enum AVPixelFormat src_pix_fmt,
159 int has_alpha, int *loss_ptr)
161 enum AVPixelFormat dst_pix_fmt;
163 static const int loss_mask_order[] = {
164 ~0, /* no loss first */
167 ~(FF_LOSS_COLORSPACE | FF_LOSS_RESOLUTION),
173 /* try with successive loss */
176 loss_mask = loss_mask_order[i++];
177 dst_pix_fmt = avcodec_find_best_pix_fmt1(pix_fmt_list, src_pix_fmt,
178 has_alpha, loss_mask);
179 if (dst_pix_fmt >= 0)
184 return AV_PIX_FMT_NONE;
187 *loss_ptr = avcodec_get_pix_fmt_loss(dst_pix_fmt, src_pix_fmt, has_alpha);
192 void ff_shrink22(uint8_t *dst, int dst_wrap,
193 const uint8_t *src, int src_wrap,
194 int width, int height)
197 const uint8_t *s1, *s2;
200 for(;height > 0; height--) {
204 for(w = width;w >= 4; w-=4) {
205 d[0] = (s1[0] + s1[1] + s2[0] + s2[1] + 2) >> 2;
206 d[1] = (s1[2] + s1[3] + s2[2] + s2[3] + 2) >> 2;
207 d[2] = (s1[4] + s1[5] + s2[4] + s2[5] + 2) >> 2;
208 d[3] = (s1[6] + s1[7] + s2[6] + s2[7] + 2) >> 2;
214 d[0] = (s1[0] + s1[1] + s2[0] + s2[1] + 2) >> 2;
225 void ff_shrink44(uint8_t *dst, int dst_wrap,
226 const uint8_t *src, int src_wrap,
227 int width, int height)
230 const uint8_t *s1, *s2, *s3, *s4;
233 for(;height > 0; height--) {
239 for(w = width;w > 0; w--) {
240 d[0] = (s1[0] + s1[1] + s1[2] + s1[3] +
241 s2[0] + s2[1] + s2[2] + s2[3] +
242 s3[0] + s3[1] + s3[2] + s3[3] +
243 s4[0] + s4[1] + s4[2] + s4[3] + 8) >> 4;
256 void ff_shrink88(uint8_t *dst, int dst_wrap,
257 const uint8_t *src, int src_wrap,
258 int width, int height)
262 for(;height > 0; height--) {
263 for(w = width;w > 0; w--) {
266 tmp += src[0] + src[1] + src[2] + src[3] + src[4] + src[5] + src[6] + src[7];
269 *(dst++) = (tmp + 32)>>6;
270 src += 8 - 8*src_wrap;
272 src += 8*src_wrap - 8*width;
273 dst += dst_wrap - width;
277 /* return true if yuv planar */
278 static inline int is_yuv_planar(const AVPixFmtDescriptor *desc)
280 return (!(desc->flags & PIX_FMT_RGB) &&
281 (desc->flags & PIX_FMT_PLANAR));
284 int av_picture_crop(AVPicture *dst, const AVPicture *src,
285 enum AVPixelFormat pix_fmt, int top_band, int left_band)
287 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
291 if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB || !is_yuv_planar(desc))
294 y_shift = desc->log2_chroma_h;
295 x_shift = desc->log2_chroma_w;
297 dst->data[0] = src->data[0] + (top_band * src->linesize[0]) + left_band;
298 dst->data[1] = src->data[1] + ((top_band >> y_shift) * src->linesize[1]) + (left_band >> x_shift);
299 dst->data[2] = src->data[2] + ((top_band >> y_shift) * src->linesize[2]) + (left_band >> x_shift);
301 dst->linesize[0] = src->linesize[0];
302 dst->linesize[1] = src->linesize[1];
303 dst->linesize[2] = src->linesize[2];
307 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width,
308 enum AVPixelFormat pix_fmt, int padtop, int padbottom, int padleft, int padright,
311 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
318 if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB ||
319 !is_yuv_planar(desc)) return -1;
321 for (i = 0; i < 3; i++) {
322 x_shift = i ? desc->log2_chroma_w : 0;
323 y_shift = i ? desc->log2_chroma_h : 0;
325 if (padtop || padleft) {
326 memset(dst->data[i], color[i],
327 dst->linesize[i] * (padtop >> y_shift) + (padleft >> x_shift));
330 if (padleft || padright) {
331 optr = dst->data[i] + dst->linesize[i] * (padtop >> y_shift) +
332 (dst->linesize[i] - (padright >> x_shift));
333 yheight = (height - 1 - (padtop + padbottom)) >> y_shift;
334 for (y = 0; y < yheight; y++) {
335 memset(optr, color[i], (padleft + padright) >> x_shift);
336 optr += dst->linesize[i];
340 if (src) { /* first line */
341 uint8_t *iptr = src->data[i];
342 optr = dst->data[i] + dst->linesize[i] * (padtop >> y_shift) +
343 (padleft >> x_shift);
344 memcpy(optr, iptr, (width - padleft - padright) >> x_shift);
345 iptr += src->linesize[i];
346 optr = dst->data[i] + dst->linesize[i] * (padtop >> y_shift) +
347 (dst->linesize[i] - (padright >> x_shift));
348 yheight = (height - 1 - (padtop + padbottom)) >> y_shift;
349 for (y = 0; y < yheight; y++) {
350 memset(optr, color[i], (padleft + padright) >> x_shift);
351 memcpy(optr + ((padleft + padright) >> x_shift), iptr,
352 (width - padleft - padright) >> x_shift);
353 iptr += src->linesize[i];
354 optr += dst->linesize[i];
358 if (padbottom || padright) {
359 optr = dst->data[i] + dst->linesize[i] *
360 ((height - padbottom) >> y_shift) - (padright >> x_shift);
361 memset(optr, color[i],dst->linesize[i] *
362 (padbottom >> y_shift) + (padright >> x_shift));
368 #if !HAVE_MMX_EXTERNAL
369 /* filter parameters: [-1 4 2 4 -1] // 8 */
370 static void deinterlace_line_c(uint8_t *dst,
371 const uint8_t *lum_m4, const uint8_t *lum_m3,
372 const uint8_t *lum_m2, const uint8_t *lum_m1,
376 uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
379 for(;size > 0;size--) {
381 sum += lum_m3[0] << 2;
382 sum += lum_m2[0] << 1;
383 sum += lum_m1[0] << 2;
385 dst[0] = cm[(sum + 4) >> 3];
395 static void deinterlace_line_inplace_c(uint8_t *lum_m4, uint8_t *lum_m3,
396 uint8_t *lum_m2, uint8_t *lum_m1,
397 uint8_t *lum, int size)
399 uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
402 for(;size > 0;size--) {
404 sum += lum_m3[0] << 2;
405 sum += lum_m2[0] << 1;
407 sum += lum_m1[0] << 2;
409 lum_m2[0] = cm[(sum + 4) >> 3];
417 #endif /* !HAVE_MMX_EXTERNAL */
419 /* deinterlacing : 2 temporal taps, 3 spatial taps linear filter. The
420 top field is copied as is, but the bottom field is deinterlaced
421 against the top field. */
422 static void deinterlace_bottom_field(uint8_t *dst, int dst_wrap,
423 const uint8_t *src1, int src_wrap,
424 int width, int height)
426 const uint8_t *src_m2, *src_m1, *src_0, *src_p1, *src_p2;
431 src_0=&src_m1[src_wrap];
432 src_p1=&src_0[src_wrap];
433 src_p2=&src_p1[src_wrap];
434 for(y=0;y<(height-2);y+=2) {
435 memcpy(dst,src_m1,width);
437 deinterlace_line(dst,src_m2,src_m1,src_0,src_p1,src_p2,width);
441 src_p1 += 2*src_wrap;
442 src_p2 += 2*src_wrap;
445 memcpy(dst,src_m1,width);
448 deinterlace_line(dst,src_m2,src_m1,src_0,src_0,src_0,width);
451 static void deinterlace_bottom_field_inplace(uint8_t *src1, int src_wrap,
452 int width, int height)
454 uint8_t *src_m1, *src_0, *src_p1, *src_p2;
457 buf = av_malloc(width);
460 memcpy(buf,src_m1,width);
461 src_0=&src_m1[src_wrap];
462 src_p1=&src_0[src_wrap];
463 src_p2=&src_p1[src_wrap];
464 for(y=0;y<(height-2);y+=2) {
465 deinterlace_line_inplace(buf,src_m1,src_0,src_p1,src_p2,width);
468 src_p1 += 2*src_wrap;
469 src_p2 += 2*src_wrap;
472 deinterlace_line_inplace(buf,src_m1,src_0,src_0,src_0,width);
476 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
477 enum AVPixelFormat pix_fmt, int width, int height)
481 if (pix_fmt != AV_PIX_FMT_YUV420P &&
482 pix_fmt != AV_PIX_FMT_YUVJ420P &&
483 pix_fmt != AV_PIX_FMT_YUV422P &&
484 pix_fmt != AV_PIX_FMT_YUVJ422P &&
485 pix_fmt != AV_PIX_FMT_YUV444P &&
486 pix_fmt != AV_PIX_FMT_YUV411P &&
487 pix_fmt != AV_PIX_FMT_GRAY8)
489 if ((width & 3) != 0 || (height & 3) != 0)
495 case AV_PIX_FMT_YUVJ420P:
496 case AV_PIX_FMT_YUV420P:
500 case AV_PIX_FMT_YUV422P:
501 case AV_PIX_FMT_YUVJ422P:
504 case AV_PIX_FMT_YUV411P:
510 if (pix_fmt == AV_PIX_FMT_GRAY8) {
515 deinterlace_bottom_field_inplace(dst->data[i], dst->linesize[i],
518 deinterlace_bottom_field(dst->data[i],dst->linesize[i],
519 src->data[i], src->linesize[i],