From a7722850be9f23daf1e095bc9527ba24faa9719b Mon Sep 17 00:00:00 2001
From: Andre Noll <maan@systemlinux.org>
Date: Sun, 18 Oct 2009 18:08:38 +0200
Subject: [PATCH] Replace GET_VLC by an inline funcion and kill get_vlc2().

---
 bitstream.h     | 67 ++++++++++++++++++++++++++-----------------------
 wmadec_filter.c | 27 +++-----------------
 2 files changed, 38 insertions(+), 56 deletions(-)

diff --git a/bitstream.h b/bitstream.h
index fe85aba7..df2c0b8b 100644
--- a/bitstream.h
+++ b/bitstream.h
@@ -152,38 +152,41 @@ void init_vlc(struct vlc *vlc, int nb_bits, int nb_codes, const void *bits,
 void free_vlc(struct vlc *vlc);
 
 /**
+ * Parse a vlc code.
  *
- * if the vlc code is invalid and max_depth=1 than no bits will be removed
- * if the vlc code is invalid and max_depth>1 than the number of bits removed
- * is undefined
+ * \param bits The number of bits which will be read at once, must be
+ * identical to nb_bits in init_vlc()
+ *
+ * \param max_depth The number of times bits bits must be read to completely
+ * read the longest vlc code = (max_vlc_length + bits - 1) / bits.
  */
-#define GET_VLC(code, gb, table, bits, max_depth)\
-{\
-    int n, index, nb_bits;\
-\
-    index= SHOW_UBITS(re, gb, bits);\
-    code = table[index][0];\
-    n    = table[index][1];\
-\
-    if(max_depth > 1 && n < 0){\
-        LAST_SKIP_BITS(re, gb, bits)\
-        UPDATE_CACHE(re, gb)\
-\
-        nb_bits = -n;\
-\
-        index= SHOW_UBITS(re, gb, nb_bits) + code;\
-        code = table[index][0];\
-        n    = table[index][1];\
-        if(max_depth > 2 && n < 0){\
-            LAST_SKIP_BITS(re, gb, nb_bits)\
-            UPDATE_CACHE(re, gb)\
-\
-            nb_bits = -n;\
-\
-            index= SHOW_UBITS(re, gb, nb_bits) + code;\
-            code = table[index][0];\
-            n    = table[index][1];\
-        }\
-    }\
-    SKIP_BITS(re, gb, n)\
+static inline int get_vlc(struct getbit_context *gb, VLC_TYPE(*table)[2],
+		int bits, int max_depth)
+{
+	int n, idx, nb_bits, code;
+
+	OPEN_READER(re, gb)
+	UPDATE_CACHE(re, gb)
+	idx = SHOW_UBITS(re, gb, bits);
+	code = table[idx][0];
+	n = table[idx][1];
+	if (max_depth > 1 && n < 0) {
+		LAST_SKIP_BITS(re, gb, bits)
+		UPDATE_CACHE(re, gb)
+		nb_bits = -n;
+		idx = SHOW_UBITS(re, gb, nb_bits) + code;
+		code = table[idx][0];
+		n = table[idx][1];
+		if (max_depth > 2 && n < 0) {
+			LAST_SKIP_BITS(re, gb, nb_bits)
+			UPDATE_CACHE(re, gb)
+			nb_bits = -n;
+			idx = SHOW_UBITS(re, gb, nb_bits) + code;
+			code = table[idx][0];
+			n = table[idx][1];
+		}
+	}
+	SKIP_BITS(re, gb, n)
+	CLOSE_READER(re, gb)
+	return code;
 }
diff --git a/wmadec_filter.c b/wmadec_filter.c
index 67791a60..401dfd25 100644
--- a/wmadec_filter.c
+++ b/wmadec_filter.c
@@ -574,27 +574,6 @@ static void decode_exp_lsp(struct private_wmadec_data *pwd, int ch)
 		pwd->block_len, lsp_coefs);
 }
 
-/*
- * Parse a vlc code, faster then get_vlc().
- *
- * \param bits The number of bits which will be read at once, must be
- * identical to nb_bits in init_vlc()
- *
- * \param max_depth The number of times bits bits must be read to completely
- * read the longest vlc code = (max_vlc_length + bits - 1) / bits.
- */
-static int get_vlc2(struct getbit_context *s, VLC_TYPE(*table)[2],
-		int bits, int max_depth)
-{
-	int code;
-
-	OPEN_READER(re, s)
-	UPDATE_CACHE(re, s)
-	GET_VLC(code, s, table, bits, max_depth)
-	CLOSE_READER(re, s)
-	return code;
-}
-
 /* Decode exponents coded with VLC codes. */
 static int decode_exp_vlc(struct private_wmadec_data *pwd, int ch)
 {
@@ -610,7 +589,7 @@ static int decode_exp_vlc(struct private_wmadec_data *pwd, int ch)
 	last_exp = 36;
 
 	while (q < q_end) {
-		code = get_vlc2(&pwd->gb, pwd->exp_vlc.table, EXPVLCBITS, EXPMAX);
+		code = get_vlc(&pwd->gb, pwd->exp_vlc.table, EXPVLCBITS, EXPMAX);
 		if (code < 0)
 			return -1;
 		/* NOTE: this offset is the same as MPEG4 AAC ! */
@@ -816,7 +795,7 @@ static int wma_decode_block(struct private_wmadec_data *pwd)
 								     7) - 19;
 						} else {
 							code =
-							    get_vlc2(&pwd->gb,
+							    get_vlc(&pwd->gb,
 								     pwd->
 								     hgain_vlc.
 								     table,
@@ -869,7 +848,7 @@ static int wma_decode_block(struct private_wmadec_data *pwd)
 			memset(ptr, 0, pwd->block_len * sizeof(int16_t));
 			for (;;) {
 				code =
-				    get_vlc2(&pwd->gb, coef_vlc->table, VLCBITS,
+				    get_vlc(&pwd->gb, coef_vlc->table, VLCBITS,
 					     VLCMAX);
 				if (code < 0)
 					return -1;
-- 
2.39.5