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ALAC: use sign_extend() from mathops.h 

Originally committed as revision 17739 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Måns Rullgård 2009-03-03 01:53:54 +00:00
parent 101dfa7d0a
commit 8858990f07
1 changed files with 5 additions and 9 deletions
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14
libavcodec/alac.c
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@ -56,6 +56,7 @@
#include "bitstream.h"
#include "bytestream.h"
#include "unary.h"
#include "mathops.h"
#define ALAC_EXTRADATA_SIZE 36
#define MAX_CHANNELS 2
@ -229,11 +230,6 @@ static void bastardized_rice_decompress(ALACContext *alac,
}
}
static inline int32_t extend_sign32(int32_t val, int bits)
{
return (val << (32 - bits)) >> (32 - bits);
}
static inline int sign_only(int v)
{
return v ? FFSIGN(v) : 0;
@ -273,7 +269,7 @@ static void predictor_decompress_fir_adapt(int32_t *error_buffer,
prev_value = buffer_out[i];
error_value = error_buffer[i+1];
buffer_out[i+1] =
extend_sign32((prev_value + error_value), readsamplesize);
sign_extend((prev_value + error_value), readsamplesize);
}
return;
}
@ -284,7 +280,7 @@ static void predictor_decompress_fir_adapt(int32_t *error_buffer,
int32_t val;
val = buffer_out[i] + error_buffer[i+1];
val = extend_sign32(val, readsamplesize);
val = sign_extend(val, readsamplesize);
buffer_out[i+1] = val;
}
@ -319,7 +315,7 @@ static void predictor_decompress_fir_adapt(int32_t *error_buffer,
outval = (1 << (predictor_quantitization-1)) + sum;
outval = outval >> predictor_quantitization;
outval = outval + buffer_out[0] + error_val;
outval = extend_sign32(outval, readsamplesize);
outval = sign_extend(outval, readsamplesize);
buffer_out[predictor_coef_num+1] = outval;
@ -545,7 +541,7 @@ static int alac_decode_frame(AVCodecContext *avctx,
int32_t audiobits;
audiobits = get_bits_long(&alac->gb, alac->setinfo_sample_size);
audiobits = extend_sign32(audiobits, alac->setinfo_sample_size);
audiobits = sign_extend(audiobits, alac->setinfo_sample_size);
alac->outputsamples_buffer[chan][i] = audiobits;
}