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Originally committed as revision 12875 to svn://svn.ffmpeg.org/ffmpeg/trunk
tags/v0.5
Michael Niedermayer 17 years ago
parent
commit
1f655c4fe4
1 changed files with 19 additions and 19 deletions
  1. +19
    -19
      libavcodec/alac.c

+ 19
- 19
libavcodec/alac.c View File

@@ -154,21 +154,21 @@ static inline int decode_scalar(GetBitContext *gb, int k, int limit, int readsam
/* use alternative encoding */
x = get_bits(gb, readsamplesize);
} else {
if (k >= limit)
k = limit;
if (k >= limit)
k = limit;

if (k != 1) {
int extrabits = show_bits(gb, k);
if (k != 1) {
int extrabits = show_bits(gb, k);

/* multiply x by 2^k - 1, as part of their strange algorithm */
x = (x << k) - x;
/* multiply x by 2^k - 1, as part of their strange algorithm */
x = (x << k) - x;

if (extrabits > 1) {
x += extrabits - 1;
skip_bits(gb, k);
} else
skip_bits(gb, k - 1);
}
if (extrabits > 1) {
x += extrabits - 1;
skip_bits(gb, k);
} else
skip_bits(gb, k - 1);
}
}
return x;
}
@@ -192,12 +192,12 @@ static void bastardized_rice_decompress(ALACContext *alac,
int32_t x_modified;
int32_t final_val;

/* standard rice encoding */
int k; /* size of extra bits */
/* standard rice encoding */
int k; /* size of extra bits */

/* read k, that is bits as is */
k = 31 - count_leading_zeros((history >> 9) + 3);
x= decode_scalar(&alac->gb, k, rice_kmodifier, readsamplesize);
/* read k, that is bits as is */
k = 31 - count_leading_zeros((history >> 9) + 3);
x= decode_scalar(&alac->gb, k, rice_kmodifier, readsamplesize);

x_modified = sign_modifier + x;
final_val = (x_modified + 1) / 2;
@@ -220,9 +220,9 @@ static void bastardized_rice_decompress(ALACContext *alac,

sign_modifier = 1;

k = count_leading_zeros(history) + ((history + 16) >> 6 /* / 64 */) - 24;
k = count_leading_zeros(history) + ((history + 16) >> 6 /* / 64 */) - 24;

block_size= decode_scalar(&alac->gb, k, rice_kmodifier, 16);
block_size= decode_scalar(&alac->gb, k, rice_kmodifier, 16);

if (block_size > 0) {
memset(&output_buffer[output_count+1], 0, block_size * 4);


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