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Code Issues Releases Activity

Use AVRandom

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Originally committed as revision 8004 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Kostya Shishkov 2007-02-17 11:41:59 +00:00
parent eeb40eb367
commit e4cc43625f
1 changed files with 4 additions and 11 deletions
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15
libavcodec/mpc.c
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@ -29,6 +29,7 @@
#include "avcodec.h"
#include "bitstream.h"
#include "dsputil.h"
#include "random.h"
#ifdef CONFIG_MPEGAUDIO_HP
#define USE_HIGHPRECISION
@ -50,7 +51,7 @@ typedef struct {
int IS, MSS, gapless;
int lastframelen, bands;
int oldDSCF[2][BANDS];
int rnd;
AVRandomState rnd;
int frames_to_skip;
/* for synthesis */
DECLARE_ALIGNED_16(MPA_INT, synth_buf[MPA_MAX_CHANNELS][512*2]);
@ -81,7 +82,7 @@ static int mpc7_decode_init(AVCodecContext * avctx)
return -1;
}
memset(c->oldDSCF, 0, sizeof(c->oldDSCF));
c->rnd = 0xDEADBEEF;
av_init_random(0xDEADBEEF, &c->rnd);
dsputil_init(&c->dsp, avctx);
c->dsp.bswap_buf(buf, avctx->extradata, 4);
ff_mpa_synth_init(mpa_window);
@ -135,13 +136,6 @@ static int mpc7_decode_init(AVCodecContext * avctx)
return 0;
}
// XXX replace with something better
static int av_always_inline mpc_rnd(MPCContext *c)
{
c->rnd = c->rnd * 27 + 17;
return c->rnd;
}
/**
* Process decoded Musepack data and produce PCM
* @todo make it available for MPC8 and MPC6
@ -175,8 +169,7 @@ static void inline idx_to_quant(MPCContext *c, GetBitContext *gb, int idx, int *
switch(idx){
case -1:
for(i = 0; i < SAMPLES_PER_BAND; i++){
t = mpc_rnd(c);
*dst++ = ((t>>24)& 0xFF) + ((t>>16) & 0xFF) + ((t>>8) & 0xFF) + (t & 0xFF) - 510;
*dst++ = (av_random(&c->rnd) & 0x3FC) - 510;
}
break;
case 1: