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 "libavutil/intreadwrite.h"
  23 #include "libavcodec/packet.h"
  24 #include "avformat.h"
  25 #include "rawutils.h"
  26
  27 int ff_reshuffle_raw_rgb(AVFormatContext *s, AVPacket **ppkt, AVCodecParameters *par, int expected_stride)
  28 {
  29     int ret;
  30     AVPacket *pkt = *ppkt;
  31     int64_t bpc = par->bits_per_coded_sample != 15 ? par->bits_per_coded_sample : 16;
  32     int min_stride = (par->width * bpc + 7) >> 3;
  33     int with_pal_size = min_stride * par->height + 1024;
  34     int contains_pal = bpc == 8 && pkt->size == with_pal_size;
  35     int size = contains_pal ? min_stride * par->height : pkt->size;
  36     int stride = size / par->height;
  37     int padding = expected_stride - FFMIN(expected_stride, stride);
  38     int y;
  39     AVPacket *new_pkt;
  40
  41     if (pkt->size == expected_stride * par->height)
  42         return 0;
  43     if (size != stride * par->height)
  44         return 0;
  45
  46     new_pkt = av_packet_alloc();
  47     if (!new_pkt)
  48         return AVERROR(ENOMEM);
  49
  50     ret = av_new_packet(new_pkt, expected_stride * par->height);
  51     if (ret < 0)
  52         goto fail;
  53
  54     ret = av_packet_copy_props(new_pkt, pkt);
  55     if (ret < 0)
  56         goto fail;
  57
  58     for (y = 0; y<par->height; y++) {
  59         memcpy(new_pkt->data + y*expected_stride, pkt->data + y*stride, FFMIN(expected_stride, stride));
  60         memset(new_pkt->data + y*expected_stride + expected_stride - padding, 0, padding);
  61     }
  62
  63     *ppkt = new_pkt;
  64     return 1 + contains_pal;
  65 fail:
  66     av_packet_free(&new_pkt);
  67
  68     return ret;
  69 }
  70
  71 int ff_get_packet_palette(AVFormatContext *s, AVPacket *pkt, int ret, uint32_t *palette)
  72 {
  73     uint8_t *side_data;
  74     size_t size;
  75
  76     side_data = av_packet_get_side_data(pkt, AV_PKT_DATA_PALETTE, &size);
  77     if (side_data) {
  78         if (size != AVPALETTE_SIZE) {
  79             av_log(s, AV_LOG_ERROR, "Invalid palette side data\n");
  80             return AVERROR_INVALIDDATA;
  81         }
  82         memcpy(palette, side_data, AVPALETTE_SIZE);
  83         return 1;
  84     }
  85
  86     if (ret == CONTAINS_PAL) {
  87         for (int i = 0; i < AVPALETTE_COUNT; i++)
  88             palette[i] = AV_RL32(pkt->data + pkt->size - AVPALETTE_SIZE + i*4);
  89         return 1;
  90     }
  91
  92     return 0;
  93 }