Support arithmetic decoding in ALS.

Originally committed as revision 21799 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 56 insertions, 0 deletions

diff --git a/libavcodec/bgmc.h b/libavcodec/bgmc.h
new file mode 100644
index 0000000000..bae4f3b9a0
--- /dev/null
+++ b/libavcodec/bgmc.h
@@ -0,0 +1,56 @@
+/*
+ * Block Gilbert-Moore decoder
+ * Copyright (c) 2010 Thilo Borgmann <thilo.borgmann _at_ googlemail.com>
+ *
+ * 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
+ */
+
+/**
+ * @file libavcodec/bgmc.h
+ * Block Gilbert-Moore decoder header
+ * @author Thilo Borgmann <thilo.borgmann _at_ googlemail.com>
+ */
+
+
+#ifndef AVCODEC_BGMC_H
+#define AVCODEC_BGMC_H
+
+
+#include "avcodec.h"
+#include "get_bits.h"
+
+
+int ff_bgmc_init(AVCodecContext *avctx, uint8_t **cf_lut, unsigned int **cf_lut_status);
+
+
+void ff_bgmc_end(uint8_t **cf_lut, unsigned int **cf_lut_status);
+
+
+void ff_bgmc_decode_init(GetBitContext *gb,
+                      unsigned int *h, unsigned int *l, unsigned int *v);
+
+
+void ff_bgmc_decode_end(GetBitContext *gb);
+
+
+void ff_bgmc_decode(GetBitContext *gb, unsigned int num, int32_t *dst,
+                 unsigned int delta, unsigned int sx,
+                 unsigned int *h, unsigned int *l, unsigned int *v,
+                 uint8_t *cf_lut, unsigned int *cf_lut_status);
+
+
+#endif /* AVCODEC_BGMC_H */