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ffmpeg/libavcodec/imgconvert.c

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/*
* Misc image conversion routines
* Copyright (c) 2001, 2002, 2003 Fabrice Bellard
*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; 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/avassert.h"
#include "libavutil/colorspace.h"
#include "libavutil/common.h"
#include "libavutil/pixdesc.h"
#include "libavutil/imgutils.h"
#define FF_COLOR_NA -1
#define FF_COLOR_RGB 0 /**< RGB color space */
#define FF_COLOR_GRAY 1 /**< gray color space */
#define FF_COLOR_YUV 2 /**< YUV color space. 16 <= Y <= 235, 16 <= U, V <= 240 */
#define FF_COLOR_YUV_JPEG 3 /**< YUV color space. 0 <= Y <= 255, 0 <= U, V <= 255 */
#if HAVE_MMX_EXTERNAL
#define deinterlace_line_inplace ff_deinterlace_line_inplace_mmx
#define deinterlace_line ff_deinterlace_line_mmx
#else
#define deinterlace_line_inplace deinterlace_line_inplace_c
#define deinterlace_line deinterlace_line_c
#endif
#define pixdesc_has_alpha(pixdesc) \
((pixdesc)->nb_components == 2 || (pixdesc)->nb_components == 4 || (pixdesc)->flags & AV_PIX_FMT_FLAG_PAL)
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);
av_assert0(desc);
*h_shift = desc->log2_chroma_w;
*v_shift = desc->log2_chroma_h;
}
static int get_color_type(const AVPixFmtDescriptor *desc) {
if (desc->flags & AV_PIX_FMT_FLAG_PAL)
return FF_COLOR_RGB;
if(desc->nb_components == 1 || desc->nb_components == 2)
return FF_COLOR_GRAY;
if(desc->name && !strncmp(desc->name, "yuvj", 4))
return FF_COLOR_YUV_JPEG;
if(desc->flags & AV_PIX_FMT_FLAG_RGB)
return FF_COLOR_RGB;
if(desc->nb_components == 0)
return FF_COLOR_NA;
return FF_COLOR_YUV;
}
static int get_pix_fmt_depth(int *min, int *max, enum AVPixelFormat pix_fmt)
{
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
int i;
if (!desc || !desc->nb_components) {
*min = *max = 0;
return AVERROR(EINVAL);
}
*min = INT_MAX, *max = -INT_MAX;
for (i = 0; i < desc->nb_components; i++) {
*min = FFMIN(desc->comp[i].depth_minus1+1, *min);
*max = FFMAX(desc->comp[i].depth_minus1+1, *max);
}
return 0;
}
static int get_pix_fmt_score(enum AVPixelFormat dst_pix_fmt,
enum AVPixelFormat src_pix_fmt,
unsigned *lossp, unsigned consider)
{
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 src_color, dst_color;
int src_min_depth, src_max_depth, dst_min_depth, dst_max_depth;
int ret, loss, i, nb_components;
int score = INT_MAX - 1;
if (dst_pix_fmt >= AV_PIX_FMT_NB || dst_pix_fmt <= AV_PIX_FMT_NONE)
return ~0;
/* compute loss */
*lossp = loss = 0;
if (dst_pix_fmt == src_pix_fmt)
return INT_MAX;
if ((ret = get_pix_fmt_depth(&src_min_depth, &src_max_depth, src_pix_fmt)) < 0)
return ret;
if ((ret = get_pix_fmt_depth(&dst_min_depth, &dst_max_depth, dst_pix_fmt)) < 0)
return ret;
src_color = get_color_type(src_desc);
dst_color = get_color_type(dst_desc);
if (dst_pix_fmt == AV_PIX_FMT_PAL8)
nb_components = FFMIN(src_desc->nb_components, 4);
else
nb_components = FFMIN(src_desc->nb_components, dst_desc->nb_components);
for (i = 0; i < nb_components; i++) {
int depth_minus1 = (dst_pix_fmt == AV_PIX_FMT_PAL8) ? 7/nb_components : dst_desc->comp[i].depth_minus1;
if (src_desc->comp[i].depth_minus1 > depth_minus1 && (consider & FF_LOSS_DEPTH)) {
loss |= FF_LOSS_DEPTH;
score -= 65536 >> depth_minus1;
}
}
if (consider & FF_LOSS_RESOLUTION) {
if (dst_desc->log2_chroma_w > src_desc->log2_chroma_w) {
loss |= FF_LOSS_RESOLUTION;
score -= 256 << dst_desc->log2_chroma_w;
}
if (dst_desc->log2_chroma_h > src_desc->log2_chroma_h) {
loss |= FF_LOSS_RESOLUTION;
score -= 256 << dst_desc->log2_chroma_h;
}
// don't favor 422 over 420 if downsampling is needed, because 420 has much better support on the decoder side
if (dst_desc->log2_chroma_w == 1 && src_desc->log2_chroma_w == 0 &&
dst_desc->log2_chroma_h == 1 && src_desc->log2_chroma_h == 0 ) {
score += 512;
}
}
if(consider & FF_LOSS_COLORSPACE)
switch(dst_color) {
case FF_COLOR_RGB:
if (src_color != FF_COLOR_RGB &&
src_color != FF_COLOR_GRAY)
loss |= FF_LOSS_COLORSPACE;
break;
case FF_COLOR_GRAY:
if (src_color != FF_COLOR_GRAY)
loss |= FF_LOSS_COLORSPACE;
break;
case FF_COLOR_YUV:
if (src_color != FF_COLOR_YUV)
loss |= FF_LOSS_COLORSPACE;
break;
case FF_COLOR_YUV_JPEG:
if (src_color != FF_COLOR_YUV_JPEG &&
src_color != FF_COLOR_YUV &&
src_color != FF_COLOR_GRAY)
loss |= FF_LOSS_COLORSPACE;
break;
default:
/* fail safe test */
if (src_color != dst_color)
loss |= FF_LOSS_COLORSPACE;
break;
}
if(loss & FF_LOSS_COLORSPACE)
score -= (nb_components * 65536) >> FFMIN(dst_desc->comp[0].depth_minus1, src_desc->comp[0].depth_minus1);
if (dst_color == FF_COLOR_GRAY &&
src_color != FF_COLOR_GRAY && (consider & FF_LOSS_CHROMA)) {
loss |= FF_LOSS_CHROMA;
score -= 2 * 65536;
}
if (!pixdesc_has_alpha(dst_desc) && (pixdesc_has_alpha(src_desc) && (consider & FF_LOSS_ALPHA))) {
loss |= FF_LOSS_ALPHA;
score -= 65536;
}
if (dst_pix_fmt == AV_PIX_FMT_PAL8 && (consider & FF_LOSS_COLORQUANT) &&
(src_pix_fmt != AV_PIX_FMT_PAL8 && (src_color != FF_COLOR_GRAY || (pixdesc_has_alpha(src_desc) && (consider & FF_LOSS_ALPHA))))) {
loss |= FF_LOSS_COLORQUANT;
score -= 65536;
}
*lossp = loss;
return score;
}
int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt,
enum AVPixelFormat src_pix_fmt,
int has_alpha)
{
int loss;
int ret = get_pix_fmt_score(dst_pix_fmt, src_pix_fmt, &loss, has_alpha ? ~0 : ~FF_LOSS_ALPHA);
if (ret < 0)
return ret;
return loss;
}
enum AVPixelFormat avcodec_find_best_pix_fmt_of_2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr)
{
enum AVPixelFormat dst_pix_fmt;
int loss1, loss2, loss_mask;
const AVPixFmtDescriptor *desc1 = av_pix_fmt_desc_get(dst_pix_fmt1);
const AVPixFmtDescriptor *desc2 = av_pix_fmt_desc_get(dst_pix_fmt2);
int score1, score2;
loss_mask= loss_ptr?~*loss_ptr:~0; /* use loss mask if provided */
if(!has_alpha)
loss_mask &= ~FF_LOSS_ALPHA;
dst_pix_fmt = AV_PIX_FMT_NONE;
score1 = get_pix_fmt_score(dst_pix_fmt1, src_pix_fmt, &loss1, loss_mask);
score2 = get_pix_fmt_score(dst_pix_fmt2, src_pix_fmt, &loss2, loss_mask);
if (score1 == score2) {
if(av_get_padded_bits_per_pixel(desc2) != av_get_padded_bits_per_pixel(desc1)) {
dst_pix_fmt = av_get_padded_bits_per_pixel(desc2) < av_get_padded_bits_per_pixel(desc1) ? dst_pix_fmt2 : dst_pix_fmt1;
} else {
dst_pix_fmt = desc2->nb_components < desc1->nb_components ? dst_pix_fmt2 : dst_pix_fmt1;
}
} else {
dst_pix_fmt = score1 < score2 ? dst_pix_fmt2 : dst_pix_fmt1;
}
if (loss_ptr)
*loss_ptr = avcodec_get_pix_fmt_loss(dst_pix_fmt, src_pix_fmt, has_alpha);
return dst_pix_fmt;
}
#if AV_HAVE_INCOMPATIBLE_LIBAV_ABI
enum AVPixelFormat avcodec_find_best_pix_fmt2(const enum AVPixelFormat *pix_fmt_list,
enum AVPixelFormat src_pix_fmt,
int has_alpha, int *loss_ptr){
return avcodec_find_best_pix_fmt_of_list(pix_fmt_list, src_pix_fmt, has_alpha, loss_ptr);
}
#else
enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr)
{
return avcodec_find_best_pix_fmt_of_2(dst_pix_fmt1, dst_pix_fmt2, src_pix_fmt, has_alpha, loss_ptr);
}
#endif
enum AVPixelFormat avcodec_find_best_pix_fmt_of_list(const enum AVPixelFormat *pix_fmt_list,
enum AVPixelFormat src_pix_fmt,
int has_alpha, int *loss_ptr){
int i;
enum AVPixelFormat best = AV_PIX_FMT_NONE;
for(i=0; pix_fmt_list[i] != AV_PIX_FMT_NONE; i++)
best = avcodec_find_best_pix_fmt_of_2(best, pix_fmt_list[i], src_pix_fmt, has_alpha, loss_ptr);
return best;
}
/* 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)
{
int i;
int planes[4] = { 0 };
if ( desc->flags & AV_PIX_FMT_FLAG_RGB
|| !(desc->flags & AV_PIX_FMT_FLAG_PLANAR))
return 0;
/* set the used planes */
for (i = 0; i < desc->nb_components; i++)
planes[desc->comp[i].plane] = 1;
/* if there is an unused plane, the format is not planar */
for (i = 0; i < desc->nb_components; i++)
if (!planes[i])
return 0;
return 1;
}
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)
return -1;
y_shift = desc->log2_chroma_h;
x_shift = desc->log2_chroma_w;
if (is_yuv_planar(desc)) {
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);
} else{
if(top_band % (1<<y_shift) || left_band % (1<<x_shift))
return -1;
if(left_band) //FIXME add support for this too
return -1;
dst->data[0] = src->data[0] + (top_band * src->linesize[0]) + left_band;
}
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;
}
#if FF_API_DEINTERLACE
#if !HAVE_MMX_EXTERNAL
/* filter parameters: [-1 4 2 4 -1] // 8 */
static void deinterlace_line_c(uint8_t *dst,
const uint8_t *lum_m4, const uint8_t *lum_m3,
const uint8_t *lum_m2, const uint8_t *lum_m1,
const uint8_t *lum,
int size)
{
const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP;
int sum;
for(;size > 0;size--) {
sum = -lum_m4[0];
sum += lum_m3[0] << 2;
sum += lum_m2[0] << 1;
sum += lum_m1[0] << 2;
sum += -lum[0];
dst[0] = cm[(sum + 4) >> 3];
lum_m4++;
lum_m3++;
lum_m2++;
lum_m1++;
lum++;
dst++;
}
}
static void deinterlace_line_inplace_c(uint8_t *lum_m4, uint8_t *lum_m3,
uint8_t *lum_m2, uint8_t *lum_m1,
uint8_t *lum, int size)
{
const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP;
int sum;
for(;size > 0;size--) {
sum = -lum_m4[0];
sum += lum_m3[0] << 2;
sum += lum_m2[0] << 1;
lum_m4[0]=lum_m2[0];
sum += lum_m1[0] << 2;
sum += -lum[0];
lum_m2[0] = cm[(sum + 4) >> 3];
lum_m4++;
lum_m3++;
lum_m2++;
lum_m1++;
lum++;
}
}
#endif /* !HAVE_MMX_EXTERNAL */
/* deinterlacing : 2 temporal taps, 3 spatial taps linear filter. The
top field is copied as is, but the bottom field is deinterlaced
against the top field. */
static void deinterlace_bottom_field(uint8_t *dst, int dst_wrap,
const uint8_t *src1, int src_wrap,
int width, int height)
{
const uint8_t *src_m2, *src_m1, *src_0, *src_p1, *src_p2;
int y;
src_m2 = src1;
src_m1 = src1;
src_0=&src_m1[src_wrap];
src_p1=&src_0[src_wrap];
src_p2=&src_p1[src_wrap];
for(y=0;y<(height-2);y+=2) {
memcpy(dst,src_m1,width);
dst += dst_wrap;
deinterlace_line(dst,src_m2,src_m1,src_0,src_p1,src_p2,width);
src_m2 = src_0;
src_m1 = src_p1;
src_0 = src_p2;
src_p1 += 2*src_wrap;
src_p2 += 2*src_wrap;
dst += dst_wrap;
}
memcpy(dst,src_m1,width);
dst += dst_wrap;
/* do last line */
deinterlace_line(dst,src_m2,src_m1,src_0,src_0,src_0,width);
}
static void deinterlace_bottom_field_inplace(uint8_t *src1, int src_wrap,
int width, int height)
{
uint8_t *src_m1, *src_0, *src_p1, *src_p2;
int y;
uint8_t *buf;
buf = av_malloc(width);
src_m1 = src1;
memcpy(buf,src_m1,width);
src_0=&src_m1[src_wrap];
src_p1=&src_0[src_wrap];
src_p2=&src_p1[src_wrap];
for(y=0;y<(height-2);y+=2) {
deinterlace_line_inplace(buf,src_m1,src_0,src_p1,src_p2,width);
src_m1 = src_p1;
src_0 = src_p2;
src_p1 += 2*src_wrap;
src_p2 += 2*src_wrap;
}
/* do last line */
deinterlace_line_inplace(buf,src_m1,src_0,src_0,src_0,width);
av_free(buf);
}
int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
enum AVPixelFormat pix_fmt, int width, int height)
{
int i;
if (pix_fmt != AV_PIX_FMT_YUV420P &&
pix_fmt != AV_PIX_FMT_YUVJ420P &&
pix_fmt != AV_PIX_FMT_YUV422P &&
pix_fmt != AV_PIX_FMT_YUVJ422P &&
pix_fmt != AV_PIX_FMT_YUV444P &&
pix_fmt != AV_PIX_FMT_YUV411P &&
pix_fmt != AV_PIX_FMT_GRAY8)
return -1;
if ((width & 3) != 0 || (height & 3) != 0)
return -1;
for(i=0;i<3;i++) {
if (i == 1) {
switch(pix_fmt) {
case AV_PIX_FMT_YUVJ420P:
case AV_PIX_FMT_YUV420P:
width >>= 1;
height >>= 1;
break;
case AV_PIX_FMT_YUV422P:
case AV_PIX_FMT_YUVJ422P:
width >>= 1;
break;
case AV_PIX_FMT_YUV411P:
width >>= 2;
break;
default:
break;
}
if (pix_fmt == AV_PIX_FMT_GRAY8) {
break;
}
}
if (src == dst) {
deinterlace_bottom_field_inplace(dst->data[i], dst->linesize[i],
width, height);
} else {
deinterlace_bottom_field(dst->data[i],dst->linesize[i],
src->data[i], src->linesize[i],
width, height);
}
}
emms_c();
return 0;
}
#endif /* FF_API_DEINTERLACE */
#ifdef TEST
int main(void){
int i;
int err=0;
int skip = 0;
for (i=0; i<AV_PIX_FMT_NB*2; i++) {
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(i);
if(!desc || !desc->name) {
skip ++;
continue;
}
if (skip) {
av_log(NULL, AV_LOG_INFO, "%3d unused pixel format values\n", skip);
skip = 0;
}
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));
if ((!(desc->flags & AV_PIX_FMT_FLAG_ALPHA)) != (desc->nb_components != 2 && desc->nb_components != 4)) {
av_log(NULL, AV_LOG_ERROR, "Alpha flag mismatch\n");
err = 1;
}
}
return err;
}
#endif
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