mirror of https://git.ffmpeg.org/ffmpeg.git
356 lines
11 KiB
C
356 lines
11 KiB
C
/*
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* Misc image conversion routines
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* Copyright (c) 2001, 2002, 2003 Fabrice Bellard
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* misc image conversion routines
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*/
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/* TODO:
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* - write 'ffimg' program to test all the image related stuff
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* - move all api to slice based system
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* - integrate deinterlacing, postprocessing and scaling in the conversion process
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*/
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#include "avcodec.h"
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#include "imgconvert.h"
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#include "internal.h"
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#include "mathops.h"
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#include "libavutil/avassert.h"
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#include "libavutil/colorspace.h"
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#include "libavutil/common.h"
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#include "libavutil/pixdesc.h"
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#include "libavutil/internal.h"
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#include "libavutil/imgutils.h"
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void avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift)
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{
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
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av_assert0(desc);
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*h_shift = desc->log2_chroma_w;
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*v_shift = desc->log2_chroma_h;
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}
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int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt,
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enum AVPixelFormat src_pix_fmt,
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int has_alpha)
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{
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return av_get_pix_fmt_loss(dst_pix_fmt, src_pix_fmt, has_alpha);
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}
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enum AVPixelFormat avcodec_find_best_pix_fmt_of_2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
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enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr)
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{
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return av_find_best_pix_fmt_of_2(dst_pix_fmt1, dst_pix_fmt2, src_pix_fmt, has_alpha, loss_ptr);
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}
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#if AV_HAVE_INCOMPATIBLE_LIBAV_ABI
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enum AVPixelFormat avcodec_find_best_pix_fmt2(const enum AVPixelFormat *pix_fmt_list,
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enum AVPixelFormat src_pix_fmt,
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int has_alpha, int *loss_ptr){
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return avcodec_find_best_pix_fmt_of_list(pix_fmt_list, src_pix_fmt, has_alpha, loss_ptr);
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}
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#else
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enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
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enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr)
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{
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return avcodec_find_best_pix_fmt_of_2(dst_pix_fmt1, dst_pix_fmt2, src_pix_fmt, has_alpha, loss_ptr);
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}
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#endif
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enum AVPixelFormat avcodec_find_best_pix_fmt_of_list(const enum AVPixelFormat *pix_fmt_list,
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enum AVPixelFormat src_pix_fmt,
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int has_alpha, int *loss_ptr){
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int i;
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enum AVPixelFormat best = AV_PIX_FMT_NONE;
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for(i=0; pix_fmt_list[i] != AV_PIX_FMT_NONE; i++)
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best = avcodec_find_best_pix_fmt_of_2(best, pix_fmt_list[i], src_pix_fmt, has_alpha, loss_ptr);
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return best;
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}
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/* 2x2 -> 1x1 */
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void ff_shrink22(uint8_t *dst, int dst_wrap,
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const uint8_t *src, int src_wrap,
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int width, int height)
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{
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int w;
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const uint8_t *s1, *s2;
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uint8_t *d;
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for(;height > 0; height--) {
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s1 = src;
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s2 = s1 + src_wrap;
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d = dst;
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for(w = width;w >= 4; w-=4) {
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d[0] = (s1[0] + s1[1] + s2[0] + s2[1] + 2) >> 2;
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d[1] = (s1[2] + s1[3] + s2[2] + s2[3] + 2) >> 2;
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d[2] = (s1[4] + s1[5] + s2[4] + s2[5] + 2) >> 2;
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d[3] = (s1[6] + s1[7] + s2[6] + s2[7] + 2) >> 2;
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s1 += 8;
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s2 += 8;
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d += 4;
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}
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for(;w > 0; w--) {
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d[0] = (s1[0] + s1[1] + s2[0] + s2[1] + 2) >> 2;
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s1 += 2;
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s2 += 2;
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d++;
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}
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src += 2 * src_wrap;
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dst += dst_wrap;
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}
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}
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/* 4x4 -> 1x1 */
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void ff_shrink44(uint8_t *dst, int dst_wrap,
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const uint8_t *src, int src_wrap,
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int width, int height)
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{
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int w;
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const uint8_t *s1, *s2, *s3, *s4;
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uint8_t *d;
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for(;height > 0; height--) {
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s1 = src;
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s2 = s1 + src_wrap;
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s3 = s2 + src_wrap;
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s4 = s3 + src_wrap;
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d = dst;
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for(w = width;w > 0; w--) {
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d[0] = (s1[0] + s1[1] + s1[2] + s1[3] +
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s2[0] + s2[1] + s2[2] + s2[3] +
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s3[0] + s3[1] + s3[2] + s3[3] +
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s4[0] + s4[1] + s4[2] + s4[3] + 8) >> 4;
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s1 += 4;
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s2 += 4;
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s3 += 4;
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s4 += 4;
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d++;
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}
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src += 4 * src_wrap;
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dst += dst_wrap;
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}
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}
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/* 8x8 -> 1x1 */
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void ff_shrink88(uint8_t *dst, int dst_wrap,
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const uint8_t *src, int src_wrap,
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int width, int height)
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{
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int w, i;
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for(;height > 0; height--) {
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for(w = width;w > 0; w--) {
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int tmp=0;
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for(i=0; i<8; i++){
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tmp += src[0] + src[1] + src[2] + src[3] + src[4] + src[5] + src[6] + src[7];
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src += src_wrap;
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}
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*(dst++) = (tmp + 32)>>6;
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src += 8 - 8*src_wrap;
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}
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src += 8*src_wrap - 8*width;
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dst += dst_wrap - width;
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}
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}
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/* return true if yuv planar */
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static inline int is_yuv_planar(const AVPixFmtDescriptor *desc)
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{
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int i;
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int planes[4] = { 0 };
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if ( desc->flags & AV_PIX_FMT_FLAG_RGB
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|| !(desc->flags & AV_PIX_FMT_FLAG_PLANAR))
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return 0;
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/* set the used planes */
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for (i = 0; i < desc->nb_components; i++)
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planes[desc->comp[i].plane] = 1;
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/* if there is an unused plane, the format is not planar */
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for (i = 0; i < desc->nb_components; i++)
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if (!planes[i])
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return 0;
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return 1;
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}
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#if FF_API_AVPICTURE
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FF_DISABLE_DEPRECATION_WARNINGS
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int av_picture_crop(AVPicture *dst, const AVPicture *src,
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enum AVPixelFormat pix_fmt, int top_band, int left_band)
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{
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
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int y_shift;
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int x_shift;
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int max_step[4];
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if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)
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return -1;
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y_shift = desc->log2_chroma_h;
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x_shift = desc->log2_chroma_w;
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av_image_fill_max_pixsteps(max_step, NULL, desc);
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if (is_yuv_planar(desc)) {
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dst->data[0] = src->data[0] + (top_band * src->linesize[0]) + left_band;
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dst->data[1] = src->data[1] + ((top_band >> y_shift) * src->linesize[1]) + (left_band >> x_shift);
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dst->data[2] = src->data[2] + ((top_band >> y_shift) * src->linesize[2]) + (left_band >> x_shift);
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} else{
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if(top_band % (1<<y_shift) || left_band % (1<<x_shift))
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return -1;
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dst->data[0] = src->data[0] + (top_band * src->linesize[0]) + (left_band * max_step[0]);
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}
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dst->linesize[0] = src->linesize[0];
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dst->linesize[1] = src->linesize[1];
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dst->linesize[2] = src->linesize[2];
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return 0;
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}
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int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width,
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enum AVPixelFormat pix_fmt, int padtop, int padbottom, int padleft, int padright,
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int *color)
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{
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
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uint8_t *optr;
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int y_shift;
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int x_shift;
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int yheight;
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int i, y;
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int max_step[4];
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if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)
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return -1;
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if (!is_yuv_planar(desc)) {
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if (src)
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return -1; //TODO: Not yet implemented
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av_image_fill_max_pixsteps(max_step, NULL, desc);
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if (padtop || padleft) {
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memset(dst->data[0], color[0],
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dst->linesize[0] * padtop + (padleft * max_step[0]));
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}
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if (padleft || padright) {
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optr = dst->data[0] + dst->linesize[0] * padtop +
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(dst->linesize[0] - (padright * max_step[0]));
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yheight = height - 1 - (padtop + padbottom);
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for (y = 0; y < yheight; y++) {
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memset(optr, color[0], (padleft + padright) * max_step[0]);
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optr += dst->linesize[0];
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}
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}
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if (padbottom || padright) {
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optr = dst->data[0] + dst->linesize[0] * (height - padbottom) -
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(padright * max_step[0]);
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memset(optr, color[0], dst->linesize[0] * padbottom +
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(padright * max_step[0]));
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}
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return 0;
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}
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for (i = 0; i < 3; i++) {
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x_shift = i ? desc->log2_chroma_w : 0;
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y_shift = i ? desc->log2_chroma_h : 0;
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if (padtop || padleft) {
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memset(dst->data[i], color[i],
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dst->linesize[i] * (padtop >> y_shift) + (padleft >> x_shift));
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}
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if (padleft || padright) {
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optr = dst->data[i] + dst->linesize[i] * (padtop >> y_shift) +
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(dst->linesize[i] - (padright >> x_shift));
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yheight = (height - 1 - (padtop + padbottom)) >> y_shift;
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for (y = 0; y < yheight; y++) {
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memset(optr, color[i], (padleft + padright) >> x_shift);
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optr += dst->linesize[i];
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}
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}
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if (src) { /* first line */
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uint8_t *iptr = src->data[i];
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optr = dst->data[i] + dst->linesize[i] * (padtop >> y_shift) +
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(padleft >> x_shift);
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memcpy(optr, iptr, (width - padleft - padright) >> x_shift);
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iptr += src->linesize[i];
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optr = dst->data[i] + dst->linesize[i] * (padtop >> y_shift) +
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(dst->linesize[i] - (padright >> x_shift));
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yheight = (height - 1 - (padtop + padbottom)) >> y_shift;
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for (y = 0; y < yheight; y++) {
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memset(optr, color[i], (padleft + padright) >> x_shift);
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memcpy(optr + ((padleft + padright) >> x_shift), iptr,
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(width - padleft - padright) >> x_shift);
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iptr += src->linesize[i];
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optr += dst->linesize[i];
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}
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}
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if (padbottom || padright) {
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optr = dst->data[i] + dst->linesize[i] *
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((height - padbottom) >> y_shift) - (padright >> x_shift);
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memset(optr, color[i],dst->linesize[i] *
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(padbottom >> y_shift) + (padright >> x_shift));
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}
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}
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return 0;
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}
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#ifdef TEST
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int main(void){
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int i;
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int err=0;
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int skip = 0;
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for (i=0; i<AV_PIX_FMT_NB*2; i++) {
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(i);
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if(!desc || !desc->name) {
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skip ++;
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continue;
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}
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if (skip) {
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av_log(NULL, AV_LOG_INFO, "%3d unused pixel format values\n", skip);
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skip = 0;
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}
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av_log(NULL, AV_LOG_INFO, "pix fmt %s yuv_plan:%d avg_bpp:%d\n", desc->name, is_yuv_planar(desc), av_get_padded_bits_per_pixel(desc));
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if ((!(desc->flags & AV_PIX_FMT_FLAG_ALPHA)) != (desc->nb_components != 2 && desc->nb_components != 4)) {
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av_log(NULL, AV_LOG_ERROR, "Alpha flag mismatch\n");
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err = 1;
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}
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}
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return err;
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}
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#endif
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FF_ENABLE_DEPRECATION_WARNINGS
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#endif /* FF_API_AVPICTURE */
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