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smackaud: use sign_extend() for difference value instead of casting

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This commit is contained in:
Justin Ruggles 2011-11-09 16:19:52 -05:00
parent 979c8de549
commit c86c3c8017
1 changed files with 5 additions and 4 deletions
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9
libavcodec/smacker.c
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@ -33,6 +33,7 @@
#include "avcodec.h"
#include "libavutil/audioconvert.h"
#include "mathops.h"
#define ALT_BITSTREAM_READER_LE
#include "get_bits.h"
@ -655,7 +656,7 @@ static int smka_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
else
res = 0;
val |= h[3].values[res] << 8;
pred[1] += (int16_t)val;
pred[1] += sign_extend(val, 16);
*samples++ = pred[1];
} else {
if(vlc[0].table)
@ -668,7 +669,7 @@ static int smka_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
else
res = 0;
val |= h[1].values[res] << 8;
pred[0] += val;
pred[0] += sign_extend(val, 16);
*samples++ = pred[0];
}
}
@ -683,14 +684,14 @@ static int smka_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
res = get_vlc2(&gb, vlc[1].table, SMKTREE_BITS, 3);
else
res = 0;
pred[1] += (int8_t)h[1].values[res];
pred[1] += sign_extend(h[1].values[res], 8);
*samples8++ = pred[1];
} else {
if(vlc[0].table)
res = get_vlc2(&gb, vlc[0].table, SMKTREE_BITS, 3);
else
res = 0;
pred[0] += (int8_t)h[0].values[res];
pred[0] += sign_extend(h[0].values[res], 8);
*samples8++ = pred[0];
}
}