diff options
Diffstat (limited to 'media/libstagefright/codecs/amrwbenc/src/deemph.c')
| -rw-r--r-- | media/libstagefright/codecs/amrwbenc/src/deemph.c | 145 |
1 files changed, 74 insertions, 71 deletions
diff --git a/media/libstagefright/codecs/amrwbenc/src/deemph.c b/media/libstagefright/codecs/amrwbenc/src/deemph.c index 0c49d6b..cc27f6e 100644 --- a/media/libstagefright/codecs/amrwbenc/src/deemph.c +++ b/media/libstagefright/codecs/amrwbenc/src/deemph.c @@ -17,9 +17,9 @@ /*********************************************************************** * File: deemph.c * * * -* Description:filtering through 1/(1-mu z^ -1) * -* Deemph2 --> signal is divided by 2 * -* Deemph_32 --> for 32 bits signal. * +* Description:filtering through 1/(1-mu z^ -1) * +* Deemph2 --> signal is divided by 2 * +* Deemph_32 --> for 32 bits signal. * * * ************************************************************************/ @@ -28,89 +28,92 @@ #include "math_op.h" void Deemph( - Word16 x[], /* (i/o) : input signal overwritten by the output */ - Word16 mu, /* (i) Q15 : deemphasis factor */ - Word16 L, /* (i) : vector size */ - Word16 * mem /* (i/o) : memory (y[-1]) */ - ) + Word16 x[], /* (i/o) : input signal overwritten by the output */ + Word16 mu, /* (i) Q15 : deemphasis factor */ + Word16 L, /* (i) : vector size */ + Word16 * mem /* (i/o) : memory (y[-1]) */ + ) { - Word32 i; - Word32 L_tmp; + Word32 i; + Word32 L_tmp; - L_tmp = L_deposit_h(x[0]); - L_tmp = L_mac(L_tmp, *mem, mu); - x[0] = vo_round(L_tmp); + L_tmp = L_deposit_h(x[0]); + L_tmp = L_mac(L_tmp, *mem, mu); + x[0] = vo_round(L_tmp); - for (i = 1; i < L; i++) - { - L_tmp = L_deposit_h(x[i]); - L_tmp = L_mac(L_tmp, x[i - 1], mu); - x[i] = voround(L_tmp); - } + for (i = 1; i < L; i++) + { + L_tmp = L_deposit_h(x[i]); + L_tmp = L_mac(L_tmp, x[i - 1], mu); + x[i] = voround(L_tmp); + } - *mem = x[L - 1]; + *mem = x[L - 1]; - return; + return; } void Deemph2( - Word16 x[], /* (i/o) : input signal overwritten by the output */ - Word16 mu, /* (i) Q15 : deemphasis factor */ - Word16 L, /* (i) : vector size */ - Word16 * mem /* (i/o) : memory (y[-1]) */ - ) + Word16 x[], /* (i/o) : input signal overwritten by the output */ + Word16 mu, /* (i) Q15 : deemphasis factor */ + Word16 L, /* (i) : vector size */ + Word16 * mem /* (i/o) : memory (y[-1]) */ + ) { - Word32 i; - Word32 L_tmp; - L_tmp = x[0] << 15; - L_tmp += ((*mem) * mu)<<1; - x[0] = (L_tmp + 0x8000)>>16; - for (i = 1; i < L; i++) - { - L_tmp = x[i] << 15; - L_tmp += (x[i - 1] * mu)<<1; - x[i] = (L_tmp + 0x8000)>>16; - } - *mem = x[L - 1]; - return; + Word32 i; + Word32 L_tmp; + L_tmp = x[0] << 15; + i = L_mult(*mem, mu); + L_tmp = L_add(L_tmp, i); + x[0] = voround(L_tmp); + for (i = 1; i < L; i++) + { + Word32 tmp; + L_tmp = x[i] << 15; + tmp = (x[i - 1] * mu)<<1; + L_tmp = L_add(L_tmp, tmp); + x[i] = voround(L_tmp); + } + *mem = x[L - 1]; + return; } void Deemph_32( - Word16 x_hi[], /* (i) : input signal (bit31..16) */ - Word16 x_lo[], /* (i) : input signal (bit15..4) */ - Word16 y[], /* (o) : output signal (x16) */ - Word16 mu, /* (i) Q15 : deemphasis factor */ - Word16 L, /* (i) : vector size */ - Word16 * mem /* (i/o) : memory (y[-1]) */ - ) + Word16 x_hi[], /* (i) : input signal (bit31..16) */ + Word16 x_lo[], /* (i) : input signal (bit15..4) */ + Word16 y[], /* (o) : output signal (x16) */ + Word16 mu, /* (i) Q15 : deemphasis factor */ + Word16 L, /* (i) : vector size */ + Word16 * mem /* (i/o) : memory (y[-1]) */ + ) { - Word16 fac; - Word32 i, L_tmp; - - fac = mu >> 1; /* Q15 --> Q14 */ - - L_tmp = L_deposit_h(x_hi[0]); - L_tmp += (x_lo[0] * 8)<<1; - L_tmp = (L_tmp << 3); - L_tmp += ((*mem) * fac)<<1; - L_tmp = (L_tmp << 1); - y[0] = (L_tmp + 0x8000)>>16; - - for (i = 1; i < L; i++) - { - L_tmp = L_deposit_h(x_hi[i]); - L_tmp += (x_lo[i] * 8)<<1; - L_tmp = (L_tmp << 3); - L_tmp += (y[i - 1] * fac)<<1; - L_tmp = (L_tmp << 1); - y[i] = (L_tmp + 0x8000)>>16; - } - - *mem = y[L - 1]; - - return; + Word16 fac; + Word32 i, L_tmp; + + fac = mu >> 1; /* Q15 --> Q14 */ + + L_tmp = L_deposit_h(x_hi[0]); + L_tmp += (x_lo[0] * 8)<<1; + L_tmp = (L_tmp << 3); + L_tmp += ((*mem) * fac)<<1; + L_tmp = (L_tmp << 1); + y[0] = (L_tmp + 0x8000)>>16; + + for (i = 1; i < L; i++) + { + L_tmp = L_deposit_h(x_hi[i]); + L_tmp += (x_lo[i] * 8)<<1; + L_tmp = (L_tmp << 3); + L_tmp += (y[i - 1] * fac)<<1; + L_tmp = (L_tmp << 1); + y[i] = (L_tmp + 0x8000)>>16; + } + + *mem = y[L - 1]; + + return; } |