diff options
Diffstat (limited to 'media/libstagefright/codecs/amrwbenc/src/hp6k.c')
| -rw-r--r-- | media/libstagefright/codecs/amrwbenc/src/hp6k.c | 88 |
1 files changed, 44 insertions, 44 deletions
diff --git a/media/libstagefright/codecs/amrwbenc/src/hp6k.c b/media/libstagefright/codecs/amrwbenc/src/hp6k.c index 8e66eb0..0baf612 100644 --- a/media/libstagefright/codecs/amrwbenc/src/hp6k.c +++ b/media/libstagefright/codecs/amrwbenc/src/hp6k.c @@ -17,10 +17,10 @@ /*********************************************************************** * File: hp6k.c * * * -* Description:15th order band pass 6kHz to 7kHz FIR filter * +* Description:15th order band pass 6kHz to 7kHz FIR filter * * frequency: 4kHz 5kHz 5.5kHz 6kHz 6.5kHz 7kHz 7.5kHz 8kHz * -* dB loss: -60dB -45dB -13dB -3dB 0dB -3dB -13dB -45dB * -* * +* dB loss: -60dB -45dB -13dB -3dB 0dB -3dB -13dB -45dB * +* * ************************************************************************/ #include "typedef.h" @@ -34,58 +34,58 @@ Word16 fir_6k_7k[L_FIR] = { - -32, 47, 32, -27, -369, - 1122, -1421, 0, 3798, -8880, - 12349, -10984, 3548, 7766, -18001, - 22118, -18001, 7766, 3548, -10984, - 12349, -8880, 3798, 0, -1421, - 1122, -369, -27, 32, 47, - -32 + -32, 47, 32, -27, -369, + 1122, -1421, 0, 3798, -8880, + 12349, -10984, 3548, 7766, -18001, + 22118, -18001, 7766, 3548, -10984, + 12349, -8880, 3798, 0, -1421, + 1122, -369, -27, 32, 47, + -32 }; void Init_Filt_6k_7k(Word16 mem[]) /* mem[30] */ { - Set_zero(mem, L_FIR - 1); - return; + Set_zero(mem, L_FIR - 1); + return; } void Filt_6k_7k( - Word16 signal[], /* input: signal */ - Word16 lg, /* input: length of input */ - Word16 mem[] /* in/out: memory (size=30) */ - ) + Word16 signal[], /* input: signal */ + Word16 lg, /* input: length of input */ + Word16 mem[] /* in/out: memory (size=30) */ + ) { - Word16 x[L_SUBFR16k + (L_FIR - 1)]; - Word32 i, L_tmp; + Word16 x[L_SUBFR16k + (L_FIR - 1)]; + Word32 i, L_tmp; - Copy(mem, x, L_FIR - 1); - for (i = lg - 1; i >= 0; i--) - { - x[i + L_FIR - 1] = signal[i] >> 2; /* gain of filter = 4 */ - } - for (i = 0; i < lg; i++) - { - L_tmp = (x[i] + x[i+ 30]) * fir_6k_7k[0]; - L_tmp += (x[i+1] + x[i + 29]) * fir_6k_7k[1]; - L_tmp += (x[i+2] + x[i + 28]) * fir_6k_7k[2]; - L_tmp += (x[i+3] + x[i + 27]) * fir_6k_7k[3]; - L_tmp += (x[i+4] + x[i + 26]) * fir_6k_7k[4]; - L_tmp += (x[i+5] + x[i + 25]) * fir_6k_7k[5]; - L_tmp += (x[i+6] + x[i + 24]) * fir_6k_7k[6]; - L_tmp += (x[i+7] + x[i + 23]) * fir_6k_7k[7]; - L_tmp += (x[i+8] + x[i + 22]) * fir_6k_7k[8]; - L_tmp += (x[i+9] + x[i + 21]) * fir_6k_7k[9]; - L_tmp += (x[i+10] + x[i + 20]) * fir_6k_7k[10]; - L_tmp += (x[i+11] + x[i + 19]) * fir_6k_7k[11]; - L_tmp += (x[i+12] + x[i + 18]) * fir_6k_7k[12]; - L_tmp += (x[i+13] + x[i + 17]) * fir_6k_7k[13]; - L_tmp += (x[i+14] + x[i + 16]) * fir_6k_7k[14]; - L_tmp += (x[i+15]) * fir_6k_7k[15]; - signal[i] = (L_tmp + 0x4000) >> 15; - } + Copy(mem, x, L_FIR - 1); + for (i = lg - 1; i >= 0; i--) + { + x[i + L_FIR - 1] = signal[i] >> 2; /* gain of filter = 4 */ + } + for (i = 0; i < lg; i++) + { + L_tmp = (x[i] + x[i+ 30]) * fir_6k_7k[0]; + L_tmp += (x[i+1] + x[i + 29]) * fir_6k_7k[1]; + L_tmp += (x[i+2] + x[i + 28]) * fir_6k_7k[2]; + L_tmp += (x[i+3] + x[i + 27]) * fir_6k_7k[3]; + L_tmp += (x[i+4] + x[i + 26]) * fir_6k_7k[4]; + L_tmp += (x[i+5] + x[i + 25]) * fir_6k_7k[5]; + L_tmp += (x[i+6] + x[i + 24]) * fir_6k_7k[6]; + L_tmp += (x[i+7] + x[i + 23]) * fir_6k_7k[7]; + L_tmp += (x[i+8] + x[i + 22]) * fir_6k_7k[8]; + L_tmp += (x[i+9] + x[i + 21]) * fir_6k_7k[9]; + L_tmp += (x[i+10] + x[i + 20]) * fir_6k_7k[10]; + L_tmp += (x[i+11] + x[i + 19]) * fir_6k_7k[11]; + L_tmp += (x[i+12] + x[i + 18]) * fir_6k_7k[12]; + L_tmp += (x[i+13] + x[i + 17]) * fir_6k_7k[13]; + L_tmp += (x[i+14] + x[i + 16]) * fir_6k_7k[14]; + L_tmp += (x[i+15]) * fir_6k_7k[15]; + signal[i] = (L_tmp + 0x4000) >> 15; + } - Copy(x + lg, mem, L_FIR - 1); + Copy(x + lg, mem, L_FIR - 1); } |