| /* |
| * Raw video utils |
| * Copyright (c) 2016 Michael Niedermayer |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include "avformat.h" |
| #include "internal.h" |
| |
| int ff_reshuffle_raw_rgb(AVFormatContext *s, AVPacket **ppkt, AVCodecParameters *par, int expected_stride) |
| { |
| int ret; |
| AVPacket *pkt = *ppkt; |
| int64_t bpc = par->bits_per_coded_sample != 15 ? par->bits_per_coded_sample : 16; |
| int min_stride = (par->width * bpc + 7) >> 3; |
| int with_pal_size = min_stride * par->height + 1024; |
| int contains_pal = bpc == 8 && pkt->size == with_pal_size; |
| int size = contains_pal ? min_stride * par->height : pkt->size; |
| int stride = size / par->height; |
| int padding = expected_stride - FFMIN(expected_stride, stride); |
| int y; |
| AVPacket *new_pkt; |
| |
| if (pkt->size == expected_stride * par->height) |
| return 0; |
| if (size != stride * par->height) |
| return 0; |
| |
| new_pkt = av_packet_alloc(); |
| if (!new_pkt) |
| return AVERROR(ENOMEM); |
| |
| ret = av_new_packet(new_pkt, expected_stride * par->height); |
| if (ret < 0) |
| goto fail; |
| |
| ret = av_packet_copy_props(new_pkt, pkt); |
| if (ret < 0) |
| goto fail; |
| |
| for (y = 0; y<par->height; y++) { |
| memcpy(new_pkt->data + y*expected_stride, pkt->data + y*stride, FFMIN(expected_stride, stride)); |
| memset(new_pkt->data + y*expected_stride + expected_stride - padding, 0, padding); |
| } |
| |
| *ppkt = new_pkt; |
| return 1 + contains_pal; |
| fail: |
| av_packet_free(&new_pkt); |
| |
| return ret; |
| } |