2 * Misc image conversion routines
3 * Copyright (c) 2001, 2002, 2003 Fabrice Bellard
5 * This file is part of FFmpeg.
7 * FFmpeg 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 * FFmpeg 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 FFmpeg; 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
35 #include "imgconvert.h"
37 #include "libavutil/avassert.h"
38 #include "libavutil/colorspace.h"
39 #include "libavutil/common.h"
40 #include "libavutil/pixdesc.h"
41 #include "libavutil/imgutils.h"
44 #include "x86/dsputil_x86.h"
47 #define FF_COLOR_NA -1
48 #define FF_COLOR_RGB 0 /**< RGB color space */
49 #define FF_COLOR_GRAY 1 /**< gray color space */
50 #define FF_COLOR_YUV 2 /**< YUV color space. 16 <= Y <= 235, 16 <= U, V <= 240 */
51 #define FF_COLOR_YUV_JPEG 3 /**< YUV color space. 0 <= Y <= 255, 0 <= U, V <= 255 */
54 #define deinterlace_line_inplace ff_deinterlace_line_inplace_mmx
55 #define deinterlace_line ff_deinterlace_line_mmx
57 #define deinterlace_line_inplace deinterlace_line_inplace_c
58 #define deinterlace_line deinterlace_line_c
61 #define pixdesc_has_alpha(pixdesc) \
62 ((pixdesc)->nb_components == 2 || (pixdesc)->nb_components == 4 || (pixdesc)->flags & AV_PIX_FMT_FLAG_PAL)
65 void avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift)
67 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
69 *h_shift = desc->log2_chroma_w;
70 *v_shift = desc->log2_chroma_h;
73 static int get_color_type(const AVPixFmtDescriptor *desc) {
74 if(desc->nb_components == 1 || desc->nb_components == 2)
77 if(desc->name && !strncmp(desc->name, "yuvj", 4))
78 return FF_COLOR_YUV_JPEG;
80 if(desc->flags & AV_PIX_FMT_FLAG_RGB)
83 if(desc->nb_components == 0)
89 static int get_pix_fmt_depth(int *min, int *max, enum AVPixelFormat pix_fmt)
91 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
94 if (!desc || !desc->nb_components) {
96 return AVERROR(EINVAL);
99 *min = INT_MAX, *max = -INT_MAX;
100 for (i = 0; i < desc->nb_components; i++) {
101 *min = FFMIN(desc->comp[i].depth_minus1+1, *min);
102 *max = FFMAX(desc->comp[i].depth_minus1+1, *max);
107 static int get_pix_fmt_score(enum AVPixelFormat dst_pix_fmt,
108 enum AVPixelFormat src_pix_fmt,
109 unsigned *lossp, unsigned consider)
111 const AVPixFmtDescriptor *src_desc = av_pix_fmt_desc_get(src_pix_fmt);
112 const AVPixFmtDescriptor *dst_desc = av_pix_fmt_desc_get(dst_pix_fmt);
113 int src_color, dst_color;
114 int src_min_depth, src_max_depth, dst_min_depth, dst_max_depth;
115 int ret, loss, i, nb_components;
116 int score = INT_MAX - 1;
118 if (dst_pix_fmt >= AV_PIX_FMT_NB || dst_pix_fmt <= AV_PIX_FMT_NONE)
124 if (dst_pix_fmt == src_pix_fmt)
127 if ((ret = get_pix_fmt_depth(&src_min_depth, &src_max_depth, src_pix_fmt)) < 0)
129 if ((ret = get_pix_fmt_depth(&dst_min_depth, &dst_max_depth, dst_pix_fmt)) < 0)
132 src_color = get_color_type(src_desc);
133 dst_color = get_color_type(dst_desc);
134 nb_components = FFMIN(src_desc->nb_components, dst_desc->nb_components);
136 for (i = 0; i < nb_components; i++)
137 if (src_desc->comp[i].depth_minus1 > dst_desc->comp[i].depth_minus1 && (consider & FF_LOSS_DEPTH)) {
138 loss |= FF_LOSS_DEPTH;
139 score -= 65536 >> dst_desc->comp[i].depth_minus1;
142 if (consider & FF_LOSS_RESOLUTION) {
143 if (dst_desc->log2_chroma_w > src_desc->log2_chroma_w) {
144 loss |= FF_LOSS_RESOLUTION;
145 score -= 256 << dst_desc->log2_chroma_w;
147 if (dst_desc->log2_chroma_h > src_desc->log2_chroma_h) {
148 loss |= FF_LOSS_RESOLUTION;
149 score -= 256 << dst_desc->log2_chroma_h;
151 // don't favor 422 over 420 if downsampling is needed, because 420 has much better support on the decoder side
152 if (dst_desc->log2_chroma_w == 1 && src_desc->log2_chroma_w == 0 &&
153 dst_desc->log2_chroma_h == 1 && src_desc->log2_chroma_h == 0 ) {
158 if(consider & FF_LOSS_COLORSPACE)
161 if (src_color != FF_COLOR_RGB &&
162 src_color != FF_COLOR_GRAY)
163 loss |= FF_LOSS_COLORSPACE;
166 if (src_color != FF_COLOR_GRAY)
167 loss |= FF_LOSS_COLORSPACE;
170 if (src_color != FF_COLOR_YUV)
171 loss |= FF_LOSS_COLORSPACE;
173 case FF_COLOR_YUV_JPEG:
174 if (src_color != FF_COLOR_YUV_JPEG &&
175 src_color != FF_COLOR_YUV &&
176 src_color != FF_COLOR_GRAY)
177 loss |= FF_LOSS_COLORSPACE;
181 if (src_color != dst_color)
182 loss |= FF_LOSS_COLORSPACE;
185 if(loss & FF_LOSS_COLORSPACE)
186 score -= (nb_components * 65536) >> FFMIN(dst_desc->comp[0].depth_minus1, src_desc->comp[0].depth_minus1);
188 if (dst_color == FF_COLOR_GRAY &&
189 src_color != FF_COLOR_GRAY && (consider & FF_LOSS_CHROMA)) {
190 loss |= FF_LOSS_CHROMA;
193 if (!pixdesc_has_alpha(dst_desc) && (pixdesc_has_alpha(src_desc) && (consider & FF_LOSS_ALPHA))) {
194 loss |= FF_LOSS_ALPHA;
197 if (dst_pix_fmt == AV_PIX_FMT_PAL8 && (consider & FF_LOSS_COLORQUANT) &&
198 (src_pix_fmt != AV_PIX_FMT_PAL8 && (src_color != FF_COLOR_GRAY || (pixdesc_has_alpha(src_desc) && (consider & FF_LOSS_ALPHA))))) {
199 loss |= FF_LOSS_COLORQUANT;
207 int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt,
208 enum AVPixelFormat src_pix_fmt,
212 int ret = get_pix_fmt_score(dst_pix_fmt, src_pix_fmt, &loss, has_alpha ? ~0 : ~FF_LOSS_ALPHA);
218 enum AVPixelFormat avcodec_find_best_pix_fmt_of_2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
219 enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr)
221 enum AVPixelFormat dst_pix_fmt;
222 int loss1, loss2, loss_mask;
223 const AVPixFmtDescriptor *desc1 = av_pix_fmt_desc_get(dst_pix_fmt1);
224 const AVPixFmtDescriptor *desc2 = av_pix_fmt_desc_get(dst_pix_fmt2);
227 loss_mask= loss_ptr?~*loss_ptr:~0; /* use loss mask if provided */
229 loss_mask &= ~FF_LOSS_ALPHA;
231 dst_pix_fmt = AV_PIX_FMT_NONE;
232 score1 = get_pix_fmt_score(dst_pix_fmt1, src_pix_fmt, &loss1, loss_mask);
233 score2 = get_pix_fmt_score(dst_pix_fmt2, src_pix_fmt, &loss2, loss_mask);
235 if (score1 == score2) {
236 if(av_get_padded_bits_per_pixel(desc2) != av_get_padded_bits_per_pixel(desc1)) {
237 dst_pix_fmt = av_get_padded_bits_per_pixel(desc2) < av_get_padded_bits_per_pixel(desc1) ? dst_pix_fmt2 : dst_pix_fmt1;
239 dst_pix_fmt = desc2->nb_components < desc1->nb_components ? dst_pix_fmt2 : dst_pix_fmt1;
242 dst_pix_fmt = score1 < score2 ? dst_pix_fmt2 : dst_pix_fmt1;
246 *loss_ptr = avcodec_get_pix_fmt_loss(dst_pix_fmt, src_pix_fmt, has_alpha);
250 #if AV_HAVE_INCOMPATIBLE_FORK_ABI
251 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat *pix_fmt_list,
252 enum AVPixelFormat src_pix_fmt,
253 int has_alpha, int *loss_ptr){
254 return avcodec_find_best_pix_fmt_of_list(pix_fmt_list, src_pix_fmt, has_alpha, loss_ptr);
257 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
258 enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr)
260 return avcodec_find_best_pix_fmt_of_2(dst_pix_fmt1, dst_pix_fmt2, src_pix_fmt, has_alpha, loss_ptr);
264 enum AVPixelFormat avcodec_find_best_pix_fmt_of_list(enum AVPixelFormat *pix_fmt_list,
265 enum AVPixelFormat src_pix_fmt,
266 int has_alpha, int *loss_ptr){
269 enum AVPixelFormat best = AV_PIX_FMT_NONE;
271 for(i=0; pix_fmt_list[i] != AV_PIX_FMT_NONE; i++)
272 best = avcodec_find_best_pix_fmt_of_2(best, pix_fmt_list[i], src_pix_fmt, has_alpha, loss_ptr);
278 void ff_shrink22(uint8_t *dst, int dst_wrap,
279 const uint8_t *src, int src_wrap,
280 int width, int height)
283 const uint8_t *s1, *s2;
286 for(;height > 0; height--) {
290 for(w = width;w >= 4; w-=4) {
291 d[0] = (s1[0] + s1[1] + s2[0] + s2[1] + 2) >> 2;
292 d[1] = (s1[2] + s1[3] + s2[2] + s2[3] + 2) >> 2;
293 d[2] = (s1[4] + s1[5] + s2[4] + s2[5] + 2) >> 2;
294 d[3] = (s1[6] + s1[7] + s2[6] + s2[7] + 2) >> 2;
300 d[0] = (s1[0] + s1[1] + s2[0] + s2[1] + 2) >> 2;
311 void ff_shrink44(uint8_t *dst, int dst_wrap,
312 const uint8_t *src, int src_wrap,
313 int width, int height)
316 const uint8_t *s1, *s2, *s3, *s4;
319 for(;height > 0; height--) {
325 for(w = width;w > 0; w--) {
326 d[0] = (s1[0] + s1[1] + s1[2] + s1[3] +
327 s2[0] + s2[1] + s2[2] + s2[3] +
328 s3[0] + s3[1] + s3[2] + s3[3] +
329 s4[0] + s4[1] + s4[2] + s4[3] + 8) >> 4;
342 void ff_shrink88(uint8_t *dst, int dst_wrap,
343 const uint8_t *src, int src_wrap,
344 int width, int height)
348 for(;height > 0; height--) {
349 for(w = width;w > 0; w--) {
352 tmp += src[0] + src[1] + src[2] + src[3] + src[4] + src[5] + src[6] + src[7];
355 *(dst++) = (tmp + 32)>>6;
356 src += 8 - 8*src_wrap;
358 src += 8*src_wrap - 8*width;
359 dst += dst_wrap - width;
363 /* return true if yuv planar */
364 static inline int is_yuv_planar(const AVPixFmtDescriptor *desc)
367 int planes[4] = { 0 };
369 if ( desc->flags & AV_PIX_FMT_FLAG_RGB
370 || !(desc->flags & AV_PIX_FMT_FLAG_PLANAR))
373 /* set the used planes */
374 for (i = 0; i < desc->nb_components; i++)
375 planes[desc->comp[i].plane] = 1;
377 /* if there is an unused plane, the format is not planar */
378 for (i = 0; i < desc->nb_components; i++)
384 int av_picture_crop(AVPicture *dst, const AVPicture *src,
385 enum AVPixelFormat pix_fmt, int top_band, int left_band)
387 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
391 if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)
394 y_shift = desc->log2_chroma_h;
395 x_shift = desc->log2_chroma_w;
397 if (is_yuv_planar(desc)) {
398 dst->data[0] = src->data[0] + (top_band * src->linesize[0]) + left_band;
399 dst->data[1] = src->data[1] + ((top_band >> y_shift) * src->linesize[1]) + (left_band >> x_shift);
400 dst->data[2] = src->data[2] + ((top_band >> y_shift) * src->linesize[2]) + (left_band >> x_shift);
402 if(top_band % (1<<y_shift) || left_band % (1<<x_shift))
404 if(left_band) //FIXME add support for this too
406 dst->data[0] = src->data[0] + (top_band * src->linesize[0]) + left_band;
409 dst->linesize[0] = src->linesize[0];
410 dst->linesize[1] = src->linesize[1];
411 dst->linesize[2] = src->linesize[2];
415 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width,
416 enum AVPixelFormat pix_fmt, int padtop, int padbottom, int padleft, int padright,
419 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
426 if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB ||
427 !is_yuv_planar(desc)) return -1;
429 for (i = 0; i < 3; i++) {
430 x_shift = i ? desc->log2_chroma_w : 0;
431 y_shift = i ? desc->log2_chroma_h : 0;
433 if (padtop || padleft) {
434 memset(dst->data[i], color[i],
435 dst->linesize[i] * (padtop >> y_shift) + (padleft >> x_shift));
438 if (padleft || padright) {
439 optr = dst->data[i] + dst->linesize[i] * (padtop >> y_shift) +
440 (dst->linesize[i] - (padright >> x_shift));
441 yheight = (height - 1 - (padtop + padbottom)) >> y_shift;
442 for (y = 0; y < yheight; y++) {
443 memset(optr, color[i], (padleft + padright) >> x_shift);
444 optr += dst->linesize[i];
448 if (src) { /* first line */
449 uint8_t *iptr = src->data[i];
450 optr = dst->data[i] + dst->linesize[i] * (padtop >> y_shift) +
451 (padleft >> x_shift);
452 memcpy(optr, iptr, (width - padleft - padright) >> x_shift);
453 iptr += src->linesize[i];
454 optr = dst->data[i] + dst->linesize[i] * (padtop >> y_shift) +
455 (dst->linesize[i] - (padright >> x_shift));
456 yheight = (height - 1 - (padtop + padbottom)) >> y_shift;
457 for (y = 0; y < yheight; y++) {
458 memset(optr, color[i], (padleft + padright) >> x_shift);
459 memcpy(optr + ((padleft + padright) >> x_shift), iptr,
460 (width - padleft - padright) >> x_shift);
461 iptr += src->linesize[i];
462 optr += dst->linesize[i];
466 if (padbottom || padright) {
467 optr = dst->data[i] + dst->linesize[i] *
468 ((height - padbottom) >> y_shift) - (padright >> x_shift);
469 memset(optr, color[i],dst->linesize[i] *
470 (padbottom >> y_shift) + (padright >> x_shift));
476 #if FF_API_DEINTERLACE
478 #if !HAVE_MMX_EXTERNAL
479 /* filter parameters: [-1 4 2 4 -1] // 8 */
480 static void deinterlace_line_c(uint8_t *dst,
481 const uint8_t *lum_m4, const uint8_t *lum_m3,
482 const uint8_t *lum_m2, const uint8_t *lum_m1,
486 const uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
489 for(;size > 0;size--) {
491 sum += lum_m3[0] << 2;
492 sum += lum_m2[0] << 1;
493 sum += lum_m1[0] << 2;
495 dst[0] = cm[(sum + 4) >> 3];
505 static void deinterlace_line_inplace_c(uint8_t *lum_m4, uint8_t *lum_m3,
506 uint8_t *lum_m2, uint8_t *lum_m1,
507 uint8_t *lum, int size)
509 const uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
512 for(;size > 0;size--) {
514 sum += lum_m3[0] << 2;
515 sum += lum_m2[0] << 1;
517 sum += lum_m1[0] << 2;
519 lum_m2[0] = cm[(sum + 4) >> 3];
527 #endif /* !HAVE_MMX_EXTERNAL */
529 /* deinterlacing : 2 temporal taps, 3 spatial taps linear filter. The
530 top field is copied as is, but the bottom field is deinterlaced
531 against the top field. */
532 static void deinterlace_bottom_field(uint8_t *dst, int dst_wrap,
533 const uint8_t *src1, int src_wrap,
534 int width, int height)
536 const uint8_t *src_m2, *src_m1, *src_0, *src_p1, *src_p2;
541 src_0=&src_m1[src_wrap];
542 src_p1=&src_0[src_wrap];
543 src_p2=&src_p1[src_wrap];
544 for(y=0;y<(height-2);y+=2) {
545 memcpy(dst,src_m1,width);
547 deinterlace_line(dst,src_m2,src_m1,src_0,src_p1,src_p2,width);
551 src_p1 += 2*src_wrap;
552 src_p2 += 2*src_wrap;
555 memcpy(dst,src_m1,width);
558 deinterlace_line(dst,src_m2,src_m1,src_0,src_0,src_0,width);
561 static void deinterlace_bottom_field_inplace(uint8_t *src1, int src_wrap,
562 int width, int height)
564 uint8_t *src_m1, *src_0, *src_p1, *src_p2;
567 buf = av_malloc(width);
570 memcpy(buf,src_m1,width);
571 src_0=&src_m1[src_wrap];
572 src_p1=&src_0[src_wrap];
573 src_p2=&src_p1[src_wrap];
574 for(y=0;y<(height-2);y+=2) {
575 deinterlace_line_inplace(buf,src_m1,src_0,src_p1,src_p2,width);
578 src_p1 += 2*src_wrap;
579 src_p2 += 2*src_wrap;
582 deinterlace_line_inplace(buf,src_m1,src_0,src_0,src_0,width);
586 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
587 enum AVPixelFormat pix_fmt, int width, int height)
591 if (pix_fmt != AV_PIX_FMT_YUV420P &&
592 pix_fmt != AV_PIX_FMT_YUVJ420P &&
593 pix_fmt != AV_PIX_FMT_YUV422P &&
594 pix_fmt != AV_PIX_FMT_YUVJ422P &&
595 pix_fmt != AV_PIX_FMT_YUV444P &&
596 pix_fmt != AV_PIX_FMT_YUV411P &&
597 pix_fmt != AV_PIX_FMT_GRAY8)
599 if ((width & 3) != 0 || (height & 3) != 0)
605 case AV_PIX_FMT_YUVJ420P:
606 case AV_PIX_FMT_YUV420P:
610 case AV_PIX_FMT_YUV422P:
611 case AV_PIX_FMT_YUVJ422P:
614 case AV_PIX_FMT_YUV411P:
620 if (pix_fmt == AV_PIX_FMT_GRAY8) {
625 deinterlace_bottom_field_inplace(dst->data[i], dst->linesize[i],
628 deinterlace_bottom_field(dst->data[i],dst->linesize[i],
629 src->data[i], src->linesize[i],
637 #endif /* FF_API_DEINTERLACE */
646 for (i=0; i<AV_PIX_FMT_NB*2; i++) {
647 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(i);
648 if(!desc || !desc->name) {
653 av_log(NULL, AV_LOG_INFO, "%3d unused pixel format values\n", skip);
656 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));
657 if ((!(desc->flags & AV_PIX_FMT_FLAG_ALPHA)) != (desc->nb_components != 2 && desc->nb_components != 4)) {
658 av_log(NULL, AV_LOG_ERROR, "Alpha flag mismatch\n");