cabac: split cabac.h into declarations and function definitions

[ffmpeg] / libavcodec / mlp.c

diff --git a/libavcodec/mlp.c b/libavcodec/mlp.c
index f2a02765743d5053ef857754b5f550496b0f4750..9615b66ee18635e4726b65230d5f3516193f9252 100644 (file)
--- a/libavcodec/mlp.c
+++ b/libavcodec/mlp.c
@@ -2,26 +2,27 @@
  * MLP codec common code
  * Copyright (c) 2007-2008 Ian Caulfield
  *
- * This file is part of FFmpeg.
+ * This file is part of Libav.
  *
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav 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,
+ * Libav 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
+ * License along with Libav; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <stdint.h>
 
 #include "libavutil/crc.h"
+#include "libavutil/intreadwrite.h"
 #include "mlp.h"
 
 const uint8_t ff_mlp_huffman_tables[3][18][2] = {
@@ -41,28 +42,21 @@ const uint8_t ff_mlp_huffman_tables[3][18][2] = {
 };
 
 static int crc_init = 0;
-static AVCRC crc_63[1024];
-static AVCRC crc_1D[1024];
-
-
-static int crc_init_2D = 0;
-static AVCRC crc_2D[1024];
-
-int av_cold ff_mlp_init_crc2D(AVCodecParserContext *s)
-{
-    if (!crc_init_2D) {
-        av_crc_init(crc_2D, 0, 16, 0x002D, sizeof(crc_2D));
-        crc_init_2D = 1;
-    }
-
-    return 0;
-}
-
-void av_cold ff_mlp_init_crc()
+#if CONFIG_SMALL
+#define CRC_TABLE_SIZE 257
+#else
+#define CRC_TABLE_SIZE 1024
+#endif
+static AVCRC crc_63[CRC_TABLE_SIZE];
+static AVCRC crc_1D[CRC_TABLE_SIZE];
+static AVCRC crc_2D[CRC_TABLE_SIZE];
+
+av_cold void ff_mlp_init_crc(void)
 {
     if (!crc_init) {
         av_crc_init(crc_63, 0,  8,   0x63, sizeof(crc_63));
         av_crc_init(crc_1D, 0,  8,   0x1D, sizeof(crc_1D));
+        av_crc_init(crc_2D, 0, 16, 0x002D, sizeof(crc_2D));
         crc_init = 1;
     }
 }
@@ -107,11 +101,12 @@ uint8_t ff_mlp_calculate_parity(const uint8_t *buf, unsigned int buf_size)
     uint32_t scratch = 0;
     const uint8_t *buf_end = buf + buf_size;
 
+    for (; ((intptr_t) buf & 3) && buf < buf_end; buf++)
+        scratch ^= *buf;
     for (; buf < buf_end - 3; buf += 4)
         scratch ^= *((const uint32_t*)buf);
 
-    scratch ^= scratch >> 16;
-    scratch ^= scratch >> 8;
+    scratch = xor_32_to_8(scratch);
 
     for (; buf < buf_end; buf++)
         scratch ^= *buf;