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Using the Opus header in 48k/2.5-20 ms modes

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This commit is contained in:
Jean-Marc Valin 2011-03-21 07:06:09 -04:00
parent c5f999097f
commit d6bf19d22d
1 changed files with 53 additions and 3 deletions
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56
libcelt/celt.c
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@ -61,6 +61,40 @@ static const unsigned char spread_icdf[4] = {25, 23, 2, 0};
static const unsigned char tapset_icdf[3]={2,1,0}; static const unsigned char tapset_icdf[3]={2,1,0};
static const unsigned char toOpusTable[20] = {
0xE0, 0xE8, 0xF0, 0xF8,
0xC0, 0xC8, 0xD0, 0xD8,
0xA0, 0xA8, 0xB0, 0xB8,
0x00, 0x00, 0x00, 0x00,
0x80, 0x88, 0x90, 0x98,
};
static const unsigned char fromOpusTable[16] = {
0x80, 0x88, 0x90, 0x98,
0x40, 0x48, 0x50, 0x58,
0x20, 0x28, 0x30, 0x38,
0x00, 0x08, 0x10, 0x18
};
static inline int toOpus(unsigned char c)
{
int ret=0;
if (c<0xA0)
ret = toOpusTable[c>>3];
if (ret == 0)
return -1;
else
return ret|(c&0x7);
}
static inline int fromOpus(unsigned char c)
{
if (c<0x80)
return -1;
else
return fromOpusTable[(c>>3)-16] | (c&0x7);
}
#define COMBFILTER_MAXPERIOD 1024 #define COMBFILTER_MAXPERIOD 1024
#define COMBFILTER_MINPERIOD 15 #define COMBFILTER_MINPERIOD 15
@ -956,6 +990,14 @@ int celt_encode_with_ec_float(CELTEncoder * restrict st, const celt_sig * pcm, i
compressed[0] = tmp<<5; compressed[0] = tmp<<5;
compressed[0] |= LM<<3; compressed[0] |= LM<<3;
compressed[0] |= (C==2)<<2; compressed[0] |= (C==2)<<2;
/* Convert "standard mode" to Opus header */
if (st->mode->Fs==48000 && st->mode->shortMdctSize==120)
{
int c0 = toOpus(compressed[0]);
if (c0<0)
return CELT_BAD_ARG;
compressed[0] = c0;
}
compressed++; compressed++;
nbCompressedBytes--; nbCompressedBytes--;
} }
@ -2272,9 +2314,17 @@ int celt_decode_with_ec_float(CELTDecoder * restrict st, const unsigned char *da
if (st->signalling && data!=NULL) if (st->signalling && data!=NULL)
{ {
st->end = IMAX(1, st->mode->effEBands-2*(data[0]>>5)); int data0=data[0];
LM = (data[0]>>3)&0x3; /* Convert "standard mode" to Opus header */
C = 1 + ((data[0]>>2)&0x1); if (st->mode->Fs==48000 && st->mode->shortMdctSize==120)
{
data0 = fromOpus(data0);
if (data0<0)
return CELT_CORRUPTED_DATA;
}
st->end = IMAX(1, st->mode->effEBands-2*(data0>>5));
LM = (data0>>3)&0x3;
C = 1 + ((data0>>2)&0x1);
data++; data++;
len--; len--;
if (LM>st->mode->maxLM) if (LM>st->mode->maxLM)