change gif demuxer to gif decoder

Originally committed as revision 6760 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 50 insertions, 0 deletions

diff --git a/libavcodec/bytestream.h b/libavcodec/bytestream.h
new file mode 100644
index 0000000000..bd2ce1f6bd
--- /dev/null
+++ b/libavcodec/bytestream.h
@@ -0,0 +1,50 @@
+/*
+ * Bytestream functions
+ * copyright (c) 2006 Baptiste Coudurier <baptiste.coudurier@free.fr>
+ *
+ * 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
+ */
+
+#ifndef FFMPEG_BYTESTREAM_H
+#define FFMPEG_BYTESTREAM_H
+
+static always_inline unsigned int bytestream_get_le32(uint8_t **b)
+{
+    (*b) += 4;
+    return LE_32(*b - 4);
+}
+
+static always_inline unsigned int bytestream_get_le16(uint8_t **b)
+{
+    (*b) += 2;
+    return LE_16(*b - 2);
+}
+
+static always_inline unsigned int bytestream_get_byte(uint8_t **b)
+{
+    (*b)++;
+    return (*b)[-1];
+}
+
+static always_inline unsigned int bytestream_get_buffer(uint8_t **b, uint8_t *dst, unsigned int size)
+{
+    memcpy(dst, *b, size);
+    (*b) += size;
+    return size;
+}
+
+#endif /* FFMPEG_BYTESTREAM_H */