diff options
Diffstat (limited to 'media/libstagefright/codecs/amrwbenc/src/decim54.c')
| -rw-r--r-- | media/libstagefright/codecs/amrwbenc/src/decim54.c | 292 |
1 files changed, 146 insertions, 146 deletions
diff --git a/media/libstagefright/codecs/amrwbenc/src/decim54.c b/media/libstagefright/codecs/amrwbenc/src/decim54.c index 429a7d6..7bc5576 100644 --- a/media/libstagefright/codecs/amrwbenc/src/decim54.c +++ b/media/libstagefright/codecs/amrwbenc/src/decim54.c @@ -1,146 +1,146 @@ -/*
- ** Copyright 2003-2010, VisualOn, Inc.
- **
- ** Licensed under the Apache License, Version 2.0 (the "License");
- ** you may not use this file except in compliance with the License.
- ** You may obtain a copy of the License at
- **
- ** http://www.apache.org/licenses/LICENSE-2.0
- **
- ** Unless required by applicable law or agreed to in writing, software
- ** distributed under the License is distributed on an "AS IS" BASIS,
- ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- ** See the License for the specific language governing permissions and
- ** limitations under the License.
- */
-
-/***********************************************************************
-* File: decim54.c *
-* *
-* Description:Decimation of 16kHz signal to 12.8kHz *
-* *
-************************************************************************/
-
-#include "typedef.h"
-#include "basic_op.h"
-#include "acelp.h"
-#include "cnst.h"
-
-#define FAC5 5
-#define DOWN_FAC 26215 /* 4/5 in Q15 */
-
-#define NB_COEF_DOWN 15
-
-/* Local functions */
-static void Down_samp(
- Word16 * sig, /* input: signal to downsampling */
- Word16 * sig_d, /* output: downsampled signal */
- Word16 L_frame_d /* input: length of output */
- );
-
-/* 1/5 resolution interpolation filter (in Q14) */
-/* -1.5dB @ 6kHz, -6dB @ 6.4kHz, -10dB @ 6.6kHz, -20dB @ 6.9kHz, -25dB @ 7kHz, -55dB @ 8kHz */
-
-static Word16 fir_down1[4][30] =
-{
- {-5, 24, -50, 54, 0, -128, 294, -408, 344, 0, -647, 1505, -2379, 3034, 13107, 3034, -2379, 1505, -647, 0, 344, -408,
- 294, -128, 0, 54, -50, 24, -5, 0},
-
- {-6, 19, -26, 0, 77, -188, 270, -233, 0, 434, -964, 1366, -1293, 0, 12254, 6575, -2746, 1030, 0, -507, 601, -441,
- 198, 0, -95, 99, -58, 18, 0, -1},
-
- {-3, 9, 0, -41, 111, -170, 153, 0, -295, 649, -888, 770, 0, -1997, 9894, 9894, -1997, 0, 770, -888, 649, -295, 0,
- 153, -170, 111, -41, 0, 9, -3},
-
- {-1, 0, 18, -58, 99, -95, 0, 198, -441, 601, -507, 0, 1030, -2746, 6575, 12254, 0, -1293, 1366, -964, 434, 0,
- -233, 270, -188, 77, 0, -26, 19, -6}
-};
-
-void Init_Decim_12k8(
- Word16 mem[] /* output: memory (2*NB_COEF_DOWN) set to zeros */
- )
-{
- Set_zero(mem, 2 * NB_COEF_DOWN);
- return;
-}
-
-void Decim_12k8(
- Word16 sig16k[], /* input: signal to downsampling */
- Word16 lg, /* input: length of input */
- Word16 sig12k8[], /* output: decimated signal */
- Word16 mem[] /* in/out: memory (2*NB_COEF_DOWN) */
- )
-{
- Word16 lg_down;
- Word16 signal[L_FRAME16k + (2 * NB_COEF_DOWN)];
-
- Copy(mem, signal, 2 * NB_COEF_DOWN);
-
- Copy(sig16k, signal + (2 * NB_COEF_DOWN), lg);
-
- lg_down = (lg * DOWN_FAC)>>15;
-
- Down_samp(signal + NB_COEF_DOWN, sig12k8, lg_down);
-
- Copy(signal + lg, mem, 2 * NB_COEF_DOWN);
-
- return;
-}
-
-static void Down_samp(
- Word16 * sig, /* input: signal to downsampling */
- Word16 * sig_d, /* output: downsampled signal */
- Word16 L_frame_d /* input: length of output */
- )
-{
- Word32 i, j, frac, pos;
- Word16 *x, *y;
- Word32 L_sum;
-
- pos = 0; /* position is in Q2 -> 1/4 resolution */
- for (j = 0; j < L_frame_d; j++)
- {
- i = (pos >> 2); /* integer part */
- frac = pos & 3; /* fractional part */
- x = sig + i - NB_COEF_DOWN + 1;
- y = (Word16 *)(fir_down1 + frac);
-
- L_sum = vo_mult32((*x++),(*y++));
- L_sum += vo_mult32((*x++),(*y++));
- L_sum += vo_mult32((*x++),(*y++));
- L_sum += vo_mult32((*x++),(*y++));
- L_sum += vo_mult32((*x++),(*y++));
- L_sum += vo_mult32((*x++),(*y++));
- L_sum += vo_mult32((*x++),(*y++));
- L_sum += vo_mult32((*x++),(*y++));
- L_sum += vo_mult32((*x++),(*y++));
- L_sum += vo_mult32((*x++),(*y++));
- L_sum += vo_mult32((*x++),(*y++));
- L_sum += vo_mult32((*x++),(*y++));
- L_sum += vo_mult32((*x++),(*y++));
- L_sum += vo_mult32((*x++),(*y++));
- L_sum += vo_mult32((*x++),(*y++));
- L_sum += vo_mult32((*x++),(*y++));
- L_sum += vo_mult32((*x++),(*y++));
- L_sum += vo_mult32((*x++),(*y++));
- L_sum += vo_mult32((*x++),(*y++));
- L_sum += vo_mult32((*x++),(*y++));
- L_sum += vo_mult32((*x++),(*y++));
- L_sum += vo_mult32((*x++),(*y++));
- L_sum += vo_mult32((*x++),(*y++));
- L_sum += vo_mult32((*x++),(*y++));
- L_sum += vo_mult32((*x++),(*y++));
- L_sum += vo_mult32((*x++),(*y++));
- L_sum += vo_mult32((*x++),(*y++));
- L_sum += vo_mult32((*x++),(*y++));
- L_sum += vo_mult32((*x++),(*y++));
- L_sum += vo_mult32((*x),(*y));
-
- L_sum = L_shl2(L_sum, 2);
- sig_d[j] = extract_h(L_add(L_sum, 0x8000));
- pos += FAC5; /* pos + 5/4 */
- }
- return;
-}
-
-
+/* + ** Copyright 2003-2010, VisualOn, Inc. + ** + ** Licensed under the Apache License, Version 2.0 (the "License"); + ** you may not use this file except in compliance with the License. + ** You may obtain a copy of the License at + ** + ** http://www.apache.org/licenses/LICENSE-2.0 + ** + ** Unless required by applicable law or agreed to in writing, software + ** distributed under the License is distributed on an "AS IS" BASIS, + ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + ** See the License for the specific language governing permissions and + ** limitations under the License. + */ + +/*********************************************************************** +* File: decim54.c * +* * +* Description:Decimation of 16kHz signal to 12.8kHz * +* * +************************************************************************/ + +#include "typedef.h" +#include "basic_op.h" +#include "acelp.h" +#include "cnst.h" + +#define FAC5 5 +#define DOWN_FAC 26215 /* 4/5 in Q15 */ + +#define NB_COEF_DOWN 15 + +/* Local functions */ +static void Down_samp( + Word16 * sig, /* input: signal to downsampling */ + Word16 * sig_d, /* output: downsampled signal */ + Word16 L_frame_d /* input: length of output */ + ); + +/* 1/5 resolution interpolation filter (in Q14) */ +/* -1.5dB @ 6kHz, -6dB @ 6.4kHz, -10dB @ 6.6kHz, -20dB @ 6.9kHz, -25dB @ 7kHz, -55dB @ 8kHz */ + +static Word16 fir_down1[4][30] = +{ + {-5, 24, -50, 54, 0, -128, 294, -408, 344, 0, -647, 1505, -2379, 3034, 13107, 3034, -2379, 1505, -647, 0, 344, -408, + 294, -128, 0, 54, -50, 24, -5, 0}, + + {-6, 19, -26, 0, 77, -188, 270, -233, 0, 434, -964, 1366, -1293, 0, 12254, 6575, -2746, 1030, 0, -507, 601, -441, + 198, 0, -95, 99, -58, 18, 0, -1}, + + {-3, 9, 0, -41, 111, -170, 153, 0, -295, 649, -888, 770, 0, -1997, 9894, 9894, -1997, 0, 770, -888, 649, -295, 0, + 153, -170, 111, -41, 0, 9, -3}, + + {-1, 0, 18, -58, 99, -95, 0, 198, -441, 601, -507, 0, 1030, -2746, 6575, 12254, 0, -1293, 1366, -964, 434, 0, + -233, 270, -188, 77, 0, -26, 19, -6} +}; + +void Init_Decim_12k8( + Word16 mem[] /* output: memory (2*NB_COEF_DOWN) set to zeros */ + ) +{ + Set_zero(mem, 2 * NB_COEF_DOWN); + return; +} + +void Decim_12k8( + Word16 sig16k[], /* input: signal to downsampling */ + Word16 lg, /* input: length of input */ + Word16 sig12k8[], /* output: decimated signal */ + Word16 mem[] /* in/out: memory (2*NB_COEF_DOWN) */ + ) +{ + Word16 lg_down; + Word16 signal[L_FRAME16k + (2 * NB_COEF_DOWN)]; + + Copy(mem, signal, 2 * NB_COEF_DOWN); + + Copy(sig16k, signal + (2 * NB_COEF_DOWN), lg); + + lg_down = (lg * DOWN_FAC)>>15; + + Down_samp(signal + NB_COEF_DOWN, sig12k8, lg_down); + + Copy(signal + lg, mem, 2 * NB_COEF_DOWN); + + return; +} + +static void Down_samp( + Word16 * sig, /* input: signal to downsampling */ + Word16 * sig_d, /* output: downsampled signal */ + Word16 L_frame_d /* input: length of output */ + ) +{ + Word32 i, j, frac, pos; + Word16 *x, *y; + Word32 L_sum; + + pos = 0; /* position is in Q2 -> 1/4 resolution */ + for (j = 0; j < L_frame_d; j++) + { + i = (pos >> 2); /* integer part */ + frac = pos & 3; /* fractional part */ + x = sig + i - NB_COEF_DOWN + 1; + y = (Word16 *)(fir_down1 + frac); + + L_sum = vo_mult32((*x++),(*y++)); + L_sum += vo_mult32((*x++),(*y++)); + L_sum += vo_mult32((*x++),(*y++)); + L_sum += vo_mult32((*x++),(*y++)); + L_sum += vo_mult32((*x++),(*y++)); + L_sum += vo_mult32((*x++),(*y++)); + L_sum += vo_mult32((*x++),(*y++)); + L_sum += vo_mult32((*x++),(*y++)); + L_sum += vo_mult32((*x++),(*y++)); + L_sum += vo_mult32((*x++),(*y++)); + L_sum += vo_mult32((*x++),(*y++)); + L_sum += vo_mult32((*x++),(*y++)); + L_sum += vo_mult32((*x++),(*y++)); + L_sum += vo_mult32((*x++),(*y++)); + L_sum += vo_mult32((*x++),(*y++)); + L_sum += vo_mult32((*x++),(*y++)); + L_sum += vo_mult32((*x++),(*y++)); + L_sum += vo_mult32((*x++),(*y++)); + L_sum += vo_mult32((*x++),(*y++)); + L_sum += vo_mult32((*x++),(*y++)); + L_sum += vo_mult32((*x++),(*y++)); + L_sum += vo_mult32((*x++),(*y++)); + L_sum += vo_mult32((*x++),(*y++)); + L_sum += vo_mult32((*x++),(*y++)); + L_sum += vo_mult32((*x++),(*y++)); + L_sum += vo_mult32((*x++),(*y++)); + L_sum += vo_mult32((*x++),(*y++)); + L_sum += vo_mult32((*x++),(*y++)); + L_sum += vo_mult32((*x++),(*y++)); + L_sum += vo_mult32((*x),(*y)); + + L_sum = L_shl2(L_sum, 2); + sig_d[j] = extract_h(L_add(L_sum, 0x8000)); + pos += FAC5; /* pos + 5/4 */ + } + return; +} + + |