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by Sérgio Benjamim
FFmpeg 2.7.1 source for ppsspp. |
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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(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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