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Diffstat (limited to 'libavformat/img2_alias_pix.c')
-rw-r--r--libavformat/img2_alias_pix.c73
1 files changed, 73 insertions, 0 deletions
diff --git a/libavformat/img2_alias_pix.c b/libavformat/img2_alias_pix.c
new file mode 100644
index 0000000000..c2650ad1b3
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+++ b/libavformat/img2_alias_pix.c
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+/*
+ * 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(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,
+};