mirror of https://git.ffmpeg.org/ffmpeg.git
340 lines
11 KiB
C
340 lines
11 KiB
C
/*
|
|
* Misc image conversion routines
|
|
* Copyright (c) 2001, 2002, 2003 Fabrice Bellard
|
|
*
|
|
* This file is part of Libav.
|
|
*
|
|
* Libav is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* Libav is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with Libav; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* misc image conversion routines
|
|
*/
|
|
|
|
/* TODO:
|
|
* - write 'ffimg' program to test all the image related stuff
|
|
* - move all api to slice based system
|
|
* - integrate deinterlacing, postprocessing and scaling in the conversion process
|
|
*/
|
|
|
|
#include "avcodec.h"
|
|
#include "imgconvert.h"
|
|
#include "internal.h"
|
|
#include "mathops.h"
|
|
#include "libavutil/colorspace.h"
|
|
#include "libavutil/common.h"
|
|
#include "libavutil/pixdesc.h"
|
|
#include "libavutil/imgutils.h"
|
|
|
|
void avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift)
|
|
{
|
|
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
|
|
*h_shift = desc->log2_chroma_w;
|
|
*v_shift = desc->log2_chroma_h;
|
|
}
|
|
|
|
static int is_gray(const AVPixFmtDescriptor *desc)
|
|
{
|
|
return desc->nb_components - (desc->flags & AV_PIX_FMT_FLAG_ALPHA) == 1;
|
|
}
|
|
|
|
int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt,
|
|
enum AVPixelFormat src_pix_fmt,
|
|
int has_alpha)
|
|
{
|
|
const AVPixFmtDescriptor *src_desc = av_pix_fmt_desc_get(src_pix_fmt);
|
|
const AVPixFmtDescriptor *dst_desc = av_pix_fmt_desc_get(dst_pix_fmt);
|
|
int loss, i, nb_components = FFMIN(src_desc->nb_components,
|
|
dst_desc->nb_components);
|
|
|
|
/* compute loss */
|
|
loss = 0;
|
|
|
|
if (dst_pix_fmt == src_pix_fmt)
|
|
return 0;
|
|
|
|
for (i = 0; i < nb_components; i++)
|
|
if (src_desc->comp[i].depth > dst_desc->comp[i].depth)
|
|
loss |= FF_LOSS_DEPTH;
|
|
|
|
if (dst_desc->log2_chroma_w > src_desc->log2_chroma_w ||
|
|
dst_desc->log2_chroma_h > src_desc->log2_chroma_h)
|
|
loss |= FF_LOSS_RESOLUTION;
|
|
|
|
if ((src_desc->flags & AV_PIX_FMT_FLAG_RGB) != (dst_desc->flags & AV_PIX_FMT_FLAG_RGB))
|
|
loss |= FF_LOSS_COLORSPACE;
|
|
|
|
if (has_alpha && !(dst_desc->flags & AV_PIX_FMT_FLAG_ALPHA) &&
|
|
(src_desc->flags & AV_PIX_FMT_FLAG_ALPHA))
|
|
loss |= FF_LOSS_ALPHA;
|
|
|
|
if (dst_pix_fmt == AV_PIX_FMT_PAL8 && !is_gray(src_desc))
|
|
return loss | FF_LOSS_COLORQUANT;
|
|
|
|
if (src_desc->nb_components > dst_desc->nb_components)
|
|
if (is_gray(dst_desc))
|
|
loss |= FF_LOSS_CHROMA;
|
|
|
|
return loss;
|
|
}
|
|
|
|
static enum AVPixelFormat avcodec_find_best_pix_fmt1(enum AVPixelFormat *pix_fmt_list,
|
|
enum AVPixelFormat src_pix_fmt,
|
|
int has_alpha,
|
|
int loss_mask)
|
|
{
|
|
int dist, i, loss, min_dist;
|
|
enum AVPixelFormat dst_pix_fmt;
|
|
|
|
/* find exact color match with smallest size */
|
|
dst_pix_fmt = AV_PIX_FMT_NONE;
|
|
min_dist = 0x7fffffff;
|
|
i = 0;
|
|
while (pix_fmt_list[i] != AV_PIX_FMT_NONE) {
|
|
enum AVPixelFormat pix_fmt = pix_fmt_list[i];
|
|
|
|
if (i > AV_PIX_FMT_NB) {
|
|
av_log(NULL, AV_LOG_ERROR, "Pixel format list longer than expected, "
|
|
"it is either not properly terminated or contains duplicates\n");
|
|
return AV_PIX_FMT_NONE;
|
|
}
|
|
|
|
loss = avcodec_get_pix_fmt_loss(pix_fmt, src_pix_fmt, has_alpha) & loss_mask;
|
|
if (loss == 0) {
|
|
dist = av_get_bits_per_pixel(av_pix_fmt_desc_get(pix_fmt));
|
|
if (dist < min_dist) {
|
|
min_dist = dist;
|
|
dst_pix_fmt = pix_fmt;
|
|
}
|
|
}
|
|
i++;
|
|
}
|
|
return dst_pix_fmt;
|
|
}
|
|
|
|
enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat *pix_fmt_list,
|
|
enum AVPixelFormat src_pix_fmt,
|
|
int has_alpha, int *loss_ptr)
|
|
{
|
|
enum AVPixelFormat dst_pix_fmt;
|
|
int loss_mask, i;
|
|
static const int loss_mask_order[] = {
|
|
~0, /* no loss first */
|
|
~FF_LOSS_ALPHA,
|
|
~FF_LOSS_RESOLUTION,
|
|
~(FF_LOSS_COLORSPACE | FF_LOSS_RESOLUTION),
|
|
~FF_LOSS_COLORQUANT,
|
|
~FF_LOSS_DEPTH,
|
|
0,
|
|
};
|
|
|
|
/* try with successive loss */
|
|
i = 0;
|
|
for(;;) {
|
|
loss_mask = loss_mask_order[i++];
|
|
dst_pix_fmt = avcodec_find_best_pix_fmt1(pix_fmt_list, src_pix_fmt,
|
|
has_alpha, loss_mask);
|
|
if (dst_pix_fmt >= 0)
|
|
goto found;
|
|
if (loss_mask == 0)
|
|
break;
|
|
}
|
|
return AV_PIX_FMT_NONE;
|
|
found:
|
|
if (loss_ptr)
|
|
*loss_ptr = avcodec_get_pix_fmt_loss(dst_pix_fmt, src_pix_fmt, has_alpha);
|
|
return dst_pix_fmt;
|
|
}
|
|
|
|
/* 2x2 -> 1x1 */
|
|
void ff_shrink22(uint8_t *dst, int dst_wrap,
|
|
const uint8_t *src, int src_wrap,
|
|
int width, int height)
|
|
{
|
|
int w;
|
|
const uint8_t *s1, *s2;
|
|
uint8_t *d;
|
|
|
|
for(;height > 0; height--) {
|
|
s1 = src;
|
|
s2 = s1 + src_wrap;
|
|
d = dst;
|
|
for(w = width;w >= 4; w-=4) {
|
|
d[0] = (s1[0] + s1[1] + s2[0] + s2[1] + 2) >> 2;
|
|
d[1] = (s1[2] + s1[3] + s2[2] + s2[3] + 2) >> 2;
|
|
d[2] = (s1[4] + s1[5] + s2[4] + s2[5] + 2) >> 2;
|
|
d[3] = (s1[6] + s1[7] + s2[6] + s2[7] + 2) >> 2;
|
|
s1 += 8;
|
|
s2 += 8;
|
|
d += 4;
|
|
}
|
|
for(;w > 0; w--) {
|
|
d[0] = (s1[0] + s1[1] + s2[0] + s2[1] + 2) >> 2;
|
|
s1 += 2;
|
|
s2 += 2;
|
|
d++;
|
|
}
|
|
src += 2 * src_wrap;
|
|
dst += dst_wrap;
|
|
}
|
|
}
|
|
|
|
/* 4x4 -> 1x1 */
|
|
void ff_shrink44(uint8_t *dst, int dst_wrap,
|
|
const uint8_t *src, int src_wrap,
|
|
int width, int height)
|
|
{
|
|
int w;
|
|
const uint8_t *s1, *s2, *s3, *s4;
|
|
uint8_t *d;
|
|
|
|
for(;height > 0; height--) {
|
|
s1 = src;
|
|
s2 = s1 + src_wrap;
|
|
s3 = s2 + src_wrap;
|
|
s4 = s3 + src_wrap;
|
|
d = dst;
|
|
for(w = width;w > 0; w--) {
|
|
d[0] = (s1[0] + s1[1] + s1[2] + s1[3] +
|
|
s2[0] + s2[1] + s2[2] + s2[3] +
|
|
s3[0] + s3[1] + s3[2] + s3[3] +
|
|
s4[0] + s4[1] + s4[2] + s4[3] + 8) >> 4;
|
|
s1 += 4;
|
|
s2 += 4;
|
|
s3 += 4;
|
|
s4 += 4;
|
|
d++;
|
|
}
|
|
src += 4 * src_wrap;
|
|
dst += dst_wrap;
|
|
}
|
|
}
|
|
|
|
/* 8x8 -> 1x1 */
|
|
void ff_shrink88(uint8_t *dst, int dst_wrap,
|
|
const uint8_t *src, int src_wrap,
|
|
int width, int height)
|
|
{
|
|
int w, i;
|
|
|
|
for(;height > 0; height--) {
|
|
for(w = width;w > 0; w--) {
|
|
int tmp=0;
|
|
for(i=0; i<8; i++){
|
|
tmp += src[0] + src[1] + src[2] + src[3] + src[4] + src[5] + src[6] + src[7];
|
|
src += src_wrap;
|
|
}
|
|
*(dst++) = (tmp + 32)>>6;
|
|
src += 8 - 8*src_wrap;
|
|
}
|
|
src += 8*src_wrap - 8*width;
|
|
dst += dst_wrap - width;
|
|
}
|
|
}
|
|
|
|
/* return true if yuv planar */
|
|
static inline int is_yuv_planar(const AVPixFmtDescriptor *desc)
|
|
{
|
|
return (!(desc->flags & AV_PIX_FMT_FLAG_RGB) &&
|
|
(desc->flags & AV_PIX_FMT_FLAG_PLANAR));
|
|
}
|
|
|
|
#if FF_API_AVPICTURE
|
|
int av_picture_crop(AVPicture *dst, const AVPicture *src,
|
|
enum AVPixelFormat pix_fmt, int top_band, int left_band)
|
|
{
|
|
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
|
|
int y_shift;
|
|
int x_shift;
|
|
|
|
if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB || !is_yuv_planar(desc))
|
|
return -1;
|
|
|
|
y_shift = desc->log2_chroma_h;
|
|
x_shift = desc->log2_chroma_w;
|
|
|
|
dst->data[0] = src->data[0] + (top_band * src->linesize[0]) + left_band;
|
|
dst->data[1] = src->data[1] + ((top_band >> y_shift) * src->linesize[1]) + (left_band >> x_shift);
|
|
dst->data[2] = src->data[2] + ((top_band >> y_shift) * src->linesize[2]) + (left_band >> x_shift);
|
|
|
|
dst->linesize[0] = src->linesize[0];
|
|
dst->linesize[1] = src->linesize[1];
|
|
dst->linesize[2] = src->linesize[2];
|
|
return 0;
|
|
}
|
|
|
|
int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width,
|
|
enum AVPixelFormat pix_fmt, int padtop, int padbottom, int padleft, int padright,
|
|
int *color)
|
|
{
|
|
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
|
|
uint8_t *optr;
|
|
int y_shift;
|
|
int x_shift;
|
|
int yheight;
|
|
int i, y;
|
|
|
|
if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB ||
|
|
!is_yuv_planar(desc)) return -1;
|
|
|
|
for (i = 0; i < 3; i++) {
|
|
x_shift = i ? desc->log2_chroma_w : 0;
|
|
y_shift = i ? desc->log2_chroma_h : 0;
|
|
|
|
if (padtop || padleft) {
|
|
memset(dst->data[i], color[i],
|
|
dst->linesize[i] * (padtop >> y_shift) + (padleft >> x_shift));
|
|
}
|
|
|
|
if (padleft || padright) {
|
|
optr = dst->data[i] + dst->linesize[i] * (padtop >> y_shift) +
|
|
(dst->linesize[i] - (padright >> x_shift));
|
|
yheight = (height - 1 - (padtop + padbottom)) >> y_shift;
|
|
for (y = 0; y < yheight; y++) {
|
|
memset(optr, color[i], (padleft + padright) >> x_shift);
|
|
optr += dst->linesize[i];
|
|
}
|
|
}
|
|
|
|
if (src) { /* first line */
|
|
uint8_t *iptr = src->data[i];
|
|
optr = dst->data[i] + dst->linesize[i] * (padtop >> y_shift) +
|
|
(padleft >> x_shift);
|
|
memcpy(optr, iptr, (width - padleft - padright) >> x_shift);
|
|
iptr += src->linesize[i];
|
|
optr = dst->data[i] + dst->linesize[i] * (padtop >> y_shift) +
|
|
(dst->linesize[i] - (padright >> x_shift));
|
|
yheight = (height - 1 - (padtop + padbottom)) >> y_shift;
|
|
for (y = 0; y < yheight; y++) {
|
|
memset(optr, color[i], (padleft + padright) >> x_shift);
|
|
memcpy(optr + ((padleft + padright) >> x_shift), iptr,
|
|
(width - padleft - padright) >> x_shift);
|
|
iptr += src->linesize[i];
|
|
optr += dst->linesize[i];
|
|
}
|
|
}
|
|
|
|
if (padbottom || padright) {
|
|
optr = dst->data[i] + dst->linesize[i] *
|
|
((height - padbottom) >> y_shift) - (padright >> x_shift);
|
|
memset(optr, color[i],dst->linesize[i] *
|
|
(padbottom >> y_shift) + (padright >> x_shift));
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
#endif /* FF_API_AVPICTURE */
|