mirror of
https://github.com/FFmpeg/FFmpeg.git
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253 lines
8.4 KiB
C
253 lines
8.4 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 Libav.
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*
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* Libav 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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* Libav 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 Libav; 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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#include "avcodec.h"
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#include "internal.h"
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#include "mathops.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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#if FF_API_GETCHROMA
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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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*h_shift = desc->log2_chroma_w;
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*v_shift = desc->log2_chroma_h;
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}
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#endif
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static int is_gray(const AVPixFmtDescriptor *desc)
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{
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return desc->nb_components - (desc->flags & AV_PIX_FMT_FLAG_ALPHA) == 1;
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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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const AVPixFmtDescriptor *src_desc = av_pix_fmt_desc_get(src_pix_fmt);
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const AVPixFmtDescriptor *dst_desc = av_pix_fmt_desc_get(dst_pix_fmt);
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int loss, i, nb_components = FFMIN(src_desc->nb_components,
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dst_desc->nb_components);
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/* compute loss */
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loss = 0;
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if (dst_pix_fmt == src_pix_fmt)
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return 0;
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for (i = 0; i < nb_components; i++)
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if (src_desc->comp[i].depth > dst_desc->comp[i].depth)
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loss |= FF_LOSS_DEPTH;
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if (dst_desc->log2_chroma_w > src_desc->log2_chroma_w ||
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dst_desc->log2_chroma_h > src_desc->log2_chroma_h)
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loss |= FF_LOSS_RESOLUTION;
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if ((src_desc->flags & AV_PIX_FMT_FLAG_RGB) != (dst_desc->flags & AV_PIX_FMT_FLAG_RGB))
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loss |= FF_LOSS_COLORSPACE;
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if (has_alpha && !(dst_desc->flags & AV_PIX_FMT_FLAG_ALPHA) &&
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(src_desc->flags & AV_PIX_FMT_FLAG_ALPHA))
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loss |= FF_LOSS_ALPHA;
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if (dst_pix_fmt == AV_PIX_FMT_PAL8 && !is_gray(src_desc))
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return loss | FF_LOSS_COLORQUANT;
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if (src_desc->nb_components > dst_desc->nb_components)
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if (is_gray(dst_desc))
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loss |= FF_LOSS_CHROMA;
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return loss;
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}
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static enum AVPixelFormat avcodec_find_best_pix_fmt1(enum AVPixelFormat *pix_fmt_list,
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enum AVPixelFormat src_pix_fmt,
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int has_alpha,
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int loss_mask)
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{
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int dist, i, loss, min_dist;
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enum AVPixelFormat dst_pix_fmt;
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/* find exact color match with smallest size */
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dst_pix_fmt = AV_PIX_FMT_NONE;
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min_dist = 0x7fffffff;
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i = 0;
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while (pix_fmt_list[i] != AV_PIX_FMT_NONE) {
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enum AVPixelFormat pix_fmt = pix_fmt_list[i];
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if (i > AV_PIX_FMT_NB) {
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av_log(NULL, AV_LOG_ERROR, "Pixel format list longer than expected, "
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"it is either not properly terminated or contains duplicates\n");
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return AV_PIX_FMT_NONE;
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}
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loss = avcodec_get_pix_fmt_loss(pix_fmt, src_pix_fmt, has_alpha) & loss_mask;
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if (loss == 0) {
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dist = av_get_bits_per_pixel(av_pix_fmt_desc_get(pix_fmt));
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if (dist < min_dist) {
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min_dist = dist;
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dst_pix_fmt = pix_fmt;
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}
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}
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i++;
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}
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return dst_pix_fmt;
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}
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enum AVPixelFormat avcodec_find_best_pix_fmt2(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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{
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enum AVPixelFormat dst_pix_fmt;
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int loss_mask, i;
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static const int loss_mask_order[] = {
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~0, /* no loss first */
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~FF_LOSS_ALPHA,
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~FF_LOSS_RESOLUTION,
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~(FF_LOSS_COLORSPACE | FF_LOSS_RESOLUTION),
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~FF_LOSS_COLORQUANT,
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~FF_LOSS_DEPTH,
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0,
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};
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/* try with successive loss */
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i = 0;
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for(;;) {
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loss_mask = loss_mask_order[i++];
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dst_pix_fmt = avcodec_find_best_pix_fmt1(pix_fmt_list, src_pix_fmt,
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has_alpha, loss_mask);
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if (dst_pix_fmt >= 0)
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goto found;
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if (loss_mask == 0)
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break;
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}
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return AV_PIX_FMT_NONE;
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found:
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if (loss_ptr)
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*loss_ptr = avcodec_get_pix_fmt_loss(dst_pix_fmt, src_pix_fmt, has_alpha);
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return dst_pix_fmt;
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}
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#if FF_API_AVPICTURE
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FF_DISABLE_DEPRECATION_WARNINGS
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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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return (!(desc->flags & AV_PIX_FMT_FLAG_RGB) &&
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(desc->flags & AV_PIX_FMT_FLAG_PLANAR));
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}
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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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if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB || !is_yuv_planar(desc))
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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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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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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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if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB ||
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!is_yuv_planar(desc)) return -1;
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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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FF_ENABLE_DEPRECATION_WARNINGS
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#endif /* FF_API_AVPICTURE */
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