/* * Alias PIX image demuxer * Copyright (c) 2014 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 "img2.h" #include "libavcodec/bytestream.h" static int alias_pix_read_probe(const AVProbeData *p) { const uint8_t *b = p->buf; const uint8_t *end = b + p->buf_size; int width = bytestream_get_be16(&b); int height = bytestream_get_be16(&b); av_unused int ox = bytestream_get_be16(&b); av_unused int oy = bytestream_get_be16(&b); int bpp = bytestream_get_be16(&b); int x, y; if (!width || !height) return 0; if (bpp != 24 && bpp != 8) return 0; for (y=0; y<2 && y<height; y++) { for (x=0; x<width; ) { int count = *b++; if (count == 0 || x + count > width) return 0; if (b > end) return AVPROBE_SCORE_MAX / 8; b += bpp / 8; x += count; } } return AVPROBE_SCORE_EXTENSION + 1; } static const AVClass image2_alias_pix_class = { .class_name = "alias_pix demuxer", .item_name = av_default_item_name, .option = ff_img_options, .version = LIBAVUTIL_VERSION_INT, }; AVInputFormat ff_image2_alias_pix_demuxer = { .name = "alias_pix", .long_name = NULL_IF_CONFIG_SMALL("Alias/Wavefront PIX image"), .priv_data_size = sizeof(VideoDemuxData), .read_probe = alias_pix_read_probe, .read_header = ff_img_read_header, .read_packet = ff_img_read_packet, .raw_codec_id = AV_CODEC_ID_ALIAS_PIX, .priv_class = &image2_alias_pix_class, };