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