libavformat/rawutils.c

   1 /*
   2  * Raw video utils
   3  * Copyright (c) 2016 Michael Niedermayer
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #include "avformat.h"
  23 #include "internal.h"
  24
  25 int ff_reshuffle_raw_rgb(AVFormatContext *s, AVPacket **ppkt, AVCodecParameters *par, int expected_stride)
  26 {
  27     int ret;
  28     AVPacket *pkt = *ppkt;
  29     int64_t bpc = par->bits_per_coded_sample != 15 ? par->bits_per_coded_sample : 16;
  30     int min_stride = (par->width * bpc + 7) >> 3;
  31     int with_pal_size = min_stride * par->height + 1024;
  32     int contains_pal = bpc == 8 && pkt->size == with_pal_size;
  33     int size = contains_pal ? min_stride * par->height : pkt->size;
  34     int stride = size / par->height;
  35     int padding = expected_stride - FFMIN(expected_stride, stride);
  36     int y;
  37     AVPacket *new_pkt;
  38
  39     if (pkt->size == expected_stride * par->height)
  40         return 0;
  41     if (size != stride * par->height)
  42         return 0;
  43
  44     new_pkt = av_packet_alloc();
  45     if (!new_pkt)
  46         return AVERROR(ENOMEM);
  47
  48     ret = av_new_packet(new_pkt, expected_stride * par->height);
  49     if (ret < 0)
  50         goto fail;
  51
  52     ret = av_packet_copy_props(new_pkt, pkt);
  53     if (ret < 0)
  54         goto fail;
  55
  56     for (y = 0; y<par->height; y++) {
  57         memcpy(new_pkt->data + y*expected_stride, pkt->data + y*stride, FFMIN(expected_stride, stride));
  58         memset(new_pkt->data + y*expected_stride + expected_stride - padding, 0, padding);
  59     }
  60
  61     *ppkt = new_pkt;
  62     return 1 + contains_pal;
  63 fail:
  64     av_packet_free(&new_pkt);
  65
  66     return ret;
  67 }