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https://github.com/FFmpeg/FFmpeg.git
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126 lines
3.8 KiB
C
126 lines
3.8 KiB
C
/*
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* AVPicture management 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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* AVPicture management routines
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*/
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#include "avcodec.h"
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#include "internal.h"
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#include "libavutil/common.h"
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#include "libavutil/pixdesc.h"
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#include "libavutil/imgutils.h"
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#include "libavutil/colorspace.h"
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int avpicture_fill(AVPicture *picture, uint8_t *ptr,
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enum AVPixelFormat pix_fmt, int width, int height)
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{
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int ret;
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if ((ret = av_image_check_size(width, height, 0, NULL)) < 0)
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return ret;
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if ((ret = av_image_fill_linesizes(picture->linesize, pix_fmt, width)) < 0)
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return ret;
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return av_image_fill_pointers(picture->data, pix_fmt,
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height, ptr, picture->linesize);
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}
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int avpicture_layout(const AVPicture* src, enum AVPixelFormat pix_fmt,
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int width, int height,
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unsigned char *dest, int dest_size)
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{
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int i, j, nb_planes = 0, linesizes[4];
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
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int size = avpicture_get_size(pix_fmt, width, height);
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if (size > dest_size || size < 0)
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return AVERROR(EINVAL);
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for (i = 0; i < desc->nb_components; i++)
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nb_planes = FFMAX(desc->comp[i].plane, nb_planes);
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nb_planes++;
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av_image_fill_linesizes(linesizes, pix_fmt, width);
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for (i = 0; i < nb_planes; i++) {
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int h, shift = (i == 1 || i == 2) ? desc->log2_chroma_h : 0;
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const unsigned char *s = src->data[i];
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h = (height + (1 << shift) - 1) >> shift;
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for (j = 0; j < h; j++) {
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memcpy(dest, s, linesizes[i]);
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dest += linesizes[i];
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s += src->linesize[i];
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}
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}
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if (desc->flags & AV_PIX_FMT_FLAG_PAL)
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memcpy((unsigned char *)(((size_t)dest + 3) & ~3),
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src->data[1], 256 * 4);
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return size;
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}
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int avpicture_get_size(enum AVPixelFormat pix_fmt, int width, int height)
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{
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
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AVPicture dummy_pict;
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int ret;
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if (!desc)
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return AVERROR(EINVAL);
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if ((ret = av_image_check_size(width, height, 0, NULL)) < 0)
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return ret;
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if (desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL)
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// do not include palette for these pseudo-paletted formats
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return width * height;
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return avpicture_fill(&dummy_pict, NULL, pix_fmt, width, height);
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}
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int avpicture_alloc(AVPicture *picture,
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enum AVPixelFormat pix_fmt, int width, int height)
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{
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int ret = av_image_alloc(picture->data, picture->linesize,
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width, height, pix_fmt, 1);
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if (ret < 0) {
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memset(picture, 0, sizeof(AVPicture));
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return ret;
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}
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return 0;
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}
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void avpicture_free(AVPicture *picture)
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{
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av_free(picture->data[0]);
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}
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void av_picture_copy(AVPicture *dst, const AVPicture *src,
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enum AVPixelFormat pix_fmt, int width, int height)
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{
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av_image_copy(dst->data, dst->linesize, src->data,
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src->linesize, pix_fmt, width, height);
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}
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