68 lines
2.2 KiB
C
68 lines
2.2 KiB
C
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/*
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* Raw video utils
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* Copyright (c) 2016 Michael Niedermayer
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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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#include "avformat.h"
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#include "internal.h"
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int ff_reshuffle_raw_rgb(AVFormatContext *s, AVPacket **ppkt, AVCodecParameters *par, int expected_stride)
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{
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int ret;
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AVPacket *pkt = *ppkt;
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int64_t bpc = par->bits_per_coded_sample != 15 ? par->bits_per_coded_sample : 16;
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int min_stride = (par->width * bpc + 7) >> 3;
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int with_pal_size = min_stride * par->height + 1024;
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int contains_pal = bpc == 8 && pkt->size == with_pal_size;
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int size = contains_pal ? min_stride * par->height : pkt->size;
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int stride = size / par->height;
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int padding = expected_stride - FFMIN(expected_stride, stride);
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int y;
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AVPacket *new_pkt;
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if (pkt->size == expected_stride * par->height)
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return 0;
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if (size != stride * par->height)
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return 0;
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new_pkt = av_packet_alloc();
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if (!new_pkt)
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return AVERROR(ENOMEM);
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ret = av_new_packet(new_pkt, expected_stride * par->height);
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if (ret < 0)
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goto fail;
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ret = av_packet_copy_props(new_pkt, pkt);
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if (ret < 0)
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goto fail;
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for (y = 0; y<par->height; y++) {
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memcpy(new_pkt->data + y*expected_stride, pkt->data + y*stride, FFMIN(expected_stride, stride));
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memset(new_pkt->data + y*expected_stride + expected_stride - padding, 0, padding);
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}
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*ppkt = new_pkt;
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return 1 + contains_pal;
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fail:
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av_packet_free(&new_pkt);
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return ret;
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}
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