---
libavcodec/ac3dec.c | 11 ++++++-----
1 file changed, 6 insertions(+), 5 deletions(-)
diff --git a/libavcodec/ac3dec.c b/libavcodec/ac3dec.c
index d0628ab..609fcb5 100644
--- a/libavcodec/ac3dec.c
+++ b/libavcodec/ac3dec.c
@@ -475,6 +475,7 @@ static void ac3_decode_transform_coeffs_ch(AC3DecodeContext
*s, int ch_index, ma
for (freq = start_freq; freq < end_freq; freq++) {
int bap = baps[freq];
int mantissa;
+ bitstream_prefetch(&bc, 7);
switch (bap) {
case 0:
/* random noise with approximate range of -0.707 to 0.707 */
@@ -488,7 +489,7 @@ static void ac3_decode_transform_coeffs_ch(AC3DecodeContext
*s, int ch_index, ma
m->b1--;
mantissa = m->b1_mant[m->b1];
} else {
- int bits = bitstream_read(&bc, 5);
+ int bits = bitstream_read_cache(&bc, 5);
mantissa = b1_mantissas[bits][0];
m->b1_mant[1] = b1_mantissas[bits][1];
m->b1_mant[0] = b1_mantissas[bits][2];
@@ -500,7 +501,7 @@ static void ac3_decode_transform_coeffs_ch(AC3DecodeContext
*s, int ch_index, ma
m->b2--;
mantissa = m->b2_mant[m->b2];
} else {
- int bits = bitstream_read(&bc, 7);
+ int bits = bitstream_read_cache(&bc, 7);
mantissa = b2_mantissas[bits][0];
m->b2_mant[1] = b2_mantissas[bits][1];
m->b2_mant[0] = b2_mantissas[bits][2];
@@ -508,21 +509,21 @@ static void
ac3_decode_transform_coeffs_ch(AC3DecodeContext *s, int ch_index, ma
}
break;
case 3:
- mantissa = b3_mantissas[bitstream_read(&bc, 3)];
+ mantissa = b3_mantissas[bitstream_read_cache(&bc, 3)];
break;
case 4:
if (m->b4) {
m->b4 = 0;
mantissa = m->b4_mant;
} else {
- int bits = bitstream_read(&bc, 7);
+ int bits = bitstream_read_cache(&bc, 7);
mantissa = b4_mantissas[bits][0];
m->b4_mant = b4_mantissas[bits][1];
m->b4 = 1;
}
break;
case 5:
- mantissa = b5_mantissas[bitstream_read(&bc, 4)];
+ mantissa = b5_mantissas[bitstream_read_cache(&bc, 4)];
break;
default: /* 6 to 15 */
/* Shift mantissa and sign-extend it. */
--
2.6.1
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