RepoMirrors
/
ffmpeg
mirror of https://git.ffmpeg.org/ffmpeg.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
libavcodec/alac.c
View File

@ -56,6 +56,7 @@
#include "bitstream.h" #include "bitstream.h"
#include "bytestream.h" #include "bytestream.h"
#include "unary.h" #include "unary.h"
#include "mathops.h"
#define ALAC_EXTRADATA_SIZE 36 #define ALAC_EXTRADATA_SIZE 36
#define MAX_CHANNELS 2 #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) static inline int sign_only(int v)
{ {
return v ? FFSIGN(v) : 0; return v ? FFSIGN(v) : 0;
@ -273,7 +269,7 @@ static void predictor_decompress_fir_adapt(int32_t *error_buffer,
prev_value = buffer_out[i]; prev_value = buffer_out[i];
error_value = error_buffer[i+1]; error_value = error_buffer[i+1];
buffer_out[i+1] = buffer_out[i+1] =
extend_sign32((prev_value + error_value), readsamplesize); sign_extend((prev_value + error_value), readsamplesize);
} }
return; return;
} }
@ -284,7 +280,7 @@ static void predictor_decompress_fir_adapt(int32_t *error_buffer,
int32_t val; int32_t val;
val = buffer_out[i] + error_buffer[i+1]; val = buffer_out[i] + error_buffer[i+1];
val = extend_sign32(val, readsamplesize); val = sign_extend(val, readsamplesize);
buffer_out[i+1] = val; 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 = (1 << (predictor_quantitization-1)) + sum;
outval = outval >> predictor_quantitization; outval = outval >> predictor_quantitization;
outval = outval + buffer_out[0] + error_val; outval = outval + buffer_out[0] + error_val;
outval = extend_sign32(outval, readsamplesize); outval = sign_extend(outval, readsamplesize);
buffer_out[predictor_coef_num+1] = outval; buffer_out[predictor_coef_num+1] = outval;
@ -545,7 +541,7 @@ static int alac_decode_frame(AVCodecContext *avctx,
int32_t audiobits; int32_t audiobits;
audiobits = get_bits_long(&alac->gb, alac->setinfo_sample_size); 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; alac->outputsamples_buffer[chan][i] = audiobits;
} }