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Simplify ad_msadpmc.c: Use AV_RL16, merge sign extension into LE_16 read and

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use (int16_t) to let the compiler do the sign extension.
Reduces code size on x86_64, gcc 4.3.1 by 248 bytes.


git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@27257 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
reimar 2008-07-11 18:51:12 +00:00
parent 05deb158cf
commit 4366cc211c
1 changed files with 2 additions and 9 deletions
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11
libmpcodecs/ad_msadpcm.c
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@ -13,6 +13,7 @@
#include "config.h"
#include "libavutil/common.h"
#include "libavutil/intreadwrite.h"
#include "mpbswap.h"
#include "ad_internal.h"
@ -45,7 +46,7 @@ static const int ms_adapt_coeff2[] =
#define MS_ADPCM_PREAMBLE_SIZE 6
#define LE_16(x) ((x)[0]+(256*((x)[1])))
#define LE_16(x) ((int16_t)AV_RL16(x))
// clamp a number between 0 and 88
#define CLAMP_0_TO_88(x) x = av_clip(x, 0, 88);
@ -53,8 +54,6 @@ static const int ms_adapt_coeff2[] =
#define CLAMP_S16(x) x = av_clip_int16(x);
// clamp a number above 16
#define CLAMP_ABOVE_16(x) if (x < 16) x = 16;
// sign extend a 16-bit value
#define SE_16BIT(x) if (x & 0x8000) x -= 0x10000;
// sign extend a 4-bit value
#define SE_4BIT(x) if (x & 0x8) x -= 0x10;
@ -129,32 +128,26 @@ static int ms_adpcm_decode_block(unsigned short *output, unsigned char *input,
idelta[0] = LE_16(&input[stream_ptr]);
stream_ptr += 2;
SE_16BIT(idelta[0]);
if (channels == 2)
{
idelta[1] = LE_16(&input[stream_ptr]);
stream_ptr += 2;
SE_16BIT(idelta[1]);
}
sample1[0] = LE_16(&input[stream_ptr]);
stream_ptr += 2;
SE_16BIT(sample1[0]);
if (channels == 2)
{
sample1[1] = LE_16(&input[stream_ptr]);
stream_ptr += 2;
SE_16BIT(sample1[1]);
}
sample2[0] = LE_16(&input[stream_ptr]);
stream_ptr += 2;
SE_16BIT(sample2[0]);
if (channels == 2)
{
sample2[1] = LE_16(&input[stream_ptr]);
stream_ptr += 2;
SE_16BIT(sample2[1]);
}
if (channels == 1)