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Rewrite unpack_input() completely, patch by Vitor Sessak, vitor1001 gmail com.

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Originally committed as revision 13106 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Vitor Sessak 2008-05-10 16:02:38 +00:00 committed by Diego Biurrun
parent 47eb818713
commit 57ecbbbb1e
1 changed files with 17 additions and 45 deletions
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62
libavcodec/ra144.c
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@ -20,6 +20,7 @@
*/
#include "avcodec.h"
#include "bitstream.h"
#include "ra144.h"
#define DATABLOCK1 20 /* size of 14.4 input block in bytes */
@ -293,54 +294,25 @@ static void final(Real144_internal *glob, short *i1, short *i2, void *out,
/* Decode 20-byte input */
static void unpack_input(const unsigned char *input, unsigned int *output)
{
unsigned int outbuffer[28];
unsigned short inbuffer[10];
unsigned int x;
unsigned int *ptr;
int i;
static const uint8_t sizes[10] = {6, 5, 5, 4, 4, 3, 3, 3, 3, 2};
/* fix endianness */
for (x=0; x<20; x+=2)
inbuffer[x/2] = (input[x] << 8) + input[x+1];
GetBitContext gb;
/* unpack */
ptr=outbuffer;
*(ptr++) = 27;
*(ptr++) = (inbuffer[0] >> 10) & 0x3f;
*(ptr++) = (inbuffer[0] >> 5) & 0x1f;
*(ptr++) = inbuffer[0] & 0x1f;
*(ptr++) = (inbuffer[1] >> 12) & 0xf;
*(ptr++) = (inbuffer[1] >> 8) & 0xf;
*(ptr++) = (inbuffer[1] >> 5) & 7;
*(ptr++) = (inbuffer[1] >> 2) & 7;
*(ptr++) = ((inbuffer[1] << 1) & 6) | ((inbuffer[2] >> 15) & 1);
*(ptr++) = (inbuffer[2] >> 12) & 7;
*(ptr++) = (inbuffer[2] >> 10) & 3;
*(ptr++) = (inbuffer[2] >> 5) & 0x1f;
*(ptr++) = ((inbuffer[2] << 2) & 0x7c) | ((inbuffer[3] >> 14) & 3);
*(ptr++) = (inbuffer[3] >> 6) & 0xff;
*(ptr++) = ((inbuffer[3] << 1) & 0x7e) | ((inbuffer[4] >> 15) & 1);
*(ptr++) = (inbuffer[4] >> 8) & 0x7f;
*(ptr++) = (inbuffer[4] >> 1) & 0x7f;
*(ptr++) = ((inbuffer[4] << 7) & 0x80) | ((inbuffer[5] >> 9) & 0x7f);
*(ptr++) = (inbuffer[5] >> 2) & 0x7f;
*(ptr++) = ((inbuffer[5] << 5) & 0x60) | ((inbuffer[6] >> 11) & 0x1f);
*(ptr++) = (inbuffer[6] >> 4) & 0x7f;
*(ptr++) = ((inbuffer[6] << 4) & 0xf0) | ((inbuffer[7] >> 12) & 0xf);
*(ptr++) = (inbuffer[7] >> 5) & 0x7f;
*(ptr++) = ((inbuffer[7] << 2) & 0x7c) | ((inbuffer[8] >> 14) & 3);
*(ptr++) = (inbuffer[8] >> 7) & 0x7f;
*(ptr++) = ((inbuffer[8] << 1) & 0xfe) | ((inbuffer[9] >> 15) & 1);
*(ptr++) = (inbuffer[9] >> 8) & 0x7f;
*(ptr++) = (inbuffer[9] >> 1) & 0x7f;
init_get_bits(&gb, input, 20 * 8);
*(output++) = outbuffer[11];
for (x=1; x<11; *(output++) = outbuffer[x++]);
ptr = outbuffer+12;
for (x=0; x<16; x+=4) {
*(output++) = ptr[x];
*(output++) = ptr[x+2];
*(output++) = ptr[x+3];
*(output++) = ptr[x+1];
for (i=0; i<10; i++)
output[i+1] = get_bits(&gb, sizes[i]);
output[0] = get_bits(&gb, 5);
output += 11;
for (i=0; i<4; i++) {
output[0] = get_bits(&gb, 7);
output[3] = get_bits(&gb, 8);
output[1] = get_bits(&gb, 7);
output[2] = get_bits(&gb, 7);
output += 4;
}
}