* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- *
- * $Id: fir.h,v 1.8 2006/10/24 13:45:28 steveu Exp $
*/
-/*! \page fir_page FIR filtering
-\section fir_page_sec_1 What does it do?
-???.
-
-\section fir_page_sec_2 How does it work?
-???.
-*/
-
#if !defined(_FIR_H_)
#define _FIR_H_
can.
*/
-#if defined(USE_MMX) || defined(USE_SSE2)
-#include "mmx.h"
-#endif
-
-/*!
- 16 bit integer FIR descriptor. This defines the working state for a single
- instance of an FIR filter using 16 bit integer coefficients.
-*/
-typedef struct
-{
+/*
+ * 16 bit integer FIR descriptor. This defines the working state for a single
+ * instance of an FIR filter using 16 bit integer coefficients.
+ */
+struct fir16_state_t {
int taps;
int curr_pos;
const int16_t *coeffs;
int16_t *history;
-} fir16_state_t;
+};
-/*!
- 32 bit integer FIR descriptor. This defines the working state for a single
- instance of an FIR filter using 32 bit integer coefficients, and filtering
- 16 bit integer data.
-*/
-typedef struct
-{
+/*
+ * 32 bit integer FIR descriptor. This defines the working state for a single
+ * instance of an FIR filter using 32 bit integer coefficients, and filtering
+ * 16 bit integer data.
+ */
+struct fir32_state_t {
int taps;
int curr_pos;
const int32_t *coeffs;
int16_t *history;
-} fir32_state_t;
+};
-/*!
- Floating point FIR descriptor. This defines the working state for a single
- instance of an FIR filter using floating point coefficients and data.
-*/
-typedef struct
-{
+/*
+ * Floating point FIR descriptor. This defines the working state for a single
+ * instance of an FIR filter using floating point coefficients and data.
+ */
+struct fir_float_state_t {
int taps;
int curr_pos;
const float *coeffs;
float *history;
-} fir_float_state_t;
-
-#ifdef __cplusplus
-extern "C" {
-#endif
+};
-static __inline__ const int16_t *fir16_create(fir16_state_t *fir,
- const int16_t *coeffs,
- int taps)
+static inline const int16_t *fir16_create(struct fir16_state_t *fir,
+ const int16_t *coeffs, int taps)
{
fir->taps = taps;
fir->curr_pos = taps - 1;
fir->coeffs = coeffs;
-#if defined(USE_MMX) || defined(USE_SSE2) || defined(__bfin__)
- fir->history = kcalloc(2*taps, sizeof(int16_t), GFP_KERNEL);
+#if defined(__bfin__)
+ fir->history = kcalloc(2 * taps, sizeof(int16_t), GFP_KERNEL);
#else
fir->history = kcalloc(taps, sizeof(int16_t), GFP_KERNEL);
#endif
return fir->history;
}
-/*- End of function --------------------------------------------------------*/
-static __inline__ void fir16_flush(fir16_state_t *fir)
+static inline void fir16_flush(struct fir16_state_t *fir)
{
-#if defined(USE_MMX) || defined(USE_SSE2) || defined(__bfin__)
- memset(fir->history, 0, 2*fir->taps*sizeof(int16_t));
+#if defined(__bfin__)
+ memset(fir->history, 0, 2 * fir->taps * sizeof(int16_t));
#else
- memset(fir->history, 0, fir->taps*sizeof(int16_t));
+ memset(fir->history, 0, fir->taps * sizeof(int16_t));
#endif
}
-/*- End of function --------------------------------------------------------*/
-static __inline__ void fir16_free(fir16_state_t *fir)
+static inline void fir16_free(struct fir16_state_t *fir)
{
kfree(fir->history);
}
-/*- End of function --------------------------------------------------------*/
#ifdef __bfin__
static inline int32_t dot_asm(short *x, short *y, int len)
{
- int dot;
-
- len--;
-
- __asm__
- (
- "I0 = %1;\n\t"
- "I1 = %2;\n\t"
- "A0 = 0;\n\t"
- "R0.L = W[I0++] || R1.L = W[I1++];\n\t"
- "LOOP dot%= LC0 = %3;\n\t"
- "LOOP_BEGIN dot%=;\n\t"
- "A0 += R0.L * R1.L (IS) || R0.L = W[I0++] || R1.L = W[I1++];\n\t"
- "LOOP_END dot%=;\n\t"
- "A0 += R0.L*R1.L (IS);\n\t"
- "R0 = A0;\n\t"
- "%0 = R0;\n\t"
- : "=&d" (dot)
- : "a" (x), "a" (y), "a" (len)
- : "I0", "I1", "A1", "A0", "R0", "R1"
- );
-
- return dot;
+ int dot;
+
+ len--;
+
+ __asm__("I0 = %1;\n\t"
+ "I1 = %2;\n\t"
+ "A0 = 0;\n\t"
+ "R0.L = W[I0++] || R1.L = W[I1++];\n\t"
+ "LOOP dot%= LC0 = %3;\n\t"
+ "LOOP_BEGIN dot%=;\n\t"
+ "A0 += R0.L * R1.L (IS) || R0.L = W[I0++] || R1.L = W[I1++];\n\t"
+ "LOOP_END dot%=;\n\t"
+ "A0 += R0.L*R1.L (IS);\n\t"
+ "R0 = A0;\n\t"
+ "%0 = R0;\n\t"
+ : "=&d"(dot)
+ : "a"(x), "a"(y), "a"(len)
+ : "I0", "I1", "A1", "A0", "R0", "R1"
+ );
+
+ return dot;
}
#endif
-/*- End of function --------------------------------------------------------*/
-static __inline__ int16_t fir16(fir16_state_t *fir, int16_t sample)
+static inline int16_t fir16(struct fir16_state_t *fir, int16_t sample)
{
- int32_t y;
-#if defined(USE_MMX)
- int i;
- mmx_t *mmx_coeffs;
- mmx_t *mmx_hist;
-
- fir->history[fir->curr_pos] = sample;
- fir->history[fir->curr_pos + fir->taps] = sample;
-
- mmx_coeffs = (mmx_t *) fir->coeffs;
- mmx_hist = (mmx_t *) &fir->history[fir->curr_pos];
- i = fir->taps;
- pxor_r2r(mm4, mm4);
- /* 8 samples per iteration, so the filter must be a multiple of 8 long. */
- while (i > 0)
- {
- movq_m2r(mmx_coeffs[0], mm0);
- movq_m2r(mmx_coeffs[1], mm2);
- movq_m2r(mmx_hist[0], mm1);
- movq_m2r(mmx_hist[1], mm3);
- mmx_coeffs += 2;
- mmx_hist += 2;
- pmaddwd_r2r(mm1, mm0);
- pmaddwd_r2r(mm3, mm2);
- paddd_r2r(mm0, mm4);
- paddd_r2r(mm2, mm4);
- i -= 8;
- }
- movq_r2r(mm4, mm0);
- psrlq_i2r(32, mm0);
- paddd_r2r(mm0, mm4);
- movd_r2m(mm4, y);
- emms();
-#elif defined(USE_SSE2)
- int i;
- xmm_t *xmm_coeffs;
- xmm_t *xmm_hist;
-
- fir->history[fir->curr_pos] = sample;
- fir->history[fir->curr_pos + fir->taps] = sample;
-
- xmm_coeffs = (xmm_t *) fir->coeffs;
- xmm_hist = (xmm_t *) &fir->history[fir->curr_pos];
- i = fir->taps;
- pxor_r2r(xmm4, xmm4);
- /* 16 samples per iteration, so the filter must be a multiple of 16 long. */
- while (i > 0)
- {
- movdqu_m2r(xmm_coeffs[0], xmm0);
- movdqu_m2r(xmm_coeffs[1], xmm2);
- movdqu_m2r(xmm_hist[0], xmm1);
- movdqu_m2r(xmm_hist[1], xmm3);
- xmm_coeffs += 2;
- xmm_hist += 2;
- pmaddwd_r2r(xmm1, xmm0);
- pmaddwd_r2r(xmm3, xmm2);
- paddd_r2r(xmm0, xmm4);
- paddd_r2r(xmm2, xmm4);
- i -= 16;
- }
- movdqa_r2r(xmm4, xmm0);
- psrldq_i2r(8, xmm0);
- paddd_r2r(xmm0, xmm4);
- movdqa_r2r(xmm4, xmm0);
- psrldq_i2r(4, xmm0);
- paddd_r2r(xmm0, xmm4);
- movd_r2m(xmm4, y);
-#elif defined(__bfin__)
- fir->history[fir->curr_pos] = sample;
- fir->history[fir->curr_pos + fir->taps] = sample;
- y = dot_asm((int16_t*)fir->coeffs, &fir->history[fir->curr_pos], fir->taps);
+ int32_t y;
+#if defined(__bfin__)
+ fir->history[fir->curr_pos] = sample;
+ fir->history[fir->curr_pos + fir->taps] = sample;
+ y = dot_asm((int16_t *) fir->coeffs, &fir->history[fir->curr_pos],
+ fir->taps);
#else
- int i;
- int offset1;
- int offset2;
-
- fir->history[fir->curr_pos] = sample;
-
- offset2 = fir->curr_pos;
- offset1 = fir->taps - offset2;
- y = 0;
- for (i = fir->taps - 1; i >= offset1; i--)
- y += fir->coeffs[i]*fir->history[i - offset1];
- for ( ; i >= 0; i--)
- y += fir->coeffs[i]*fir->history[i + offset2];
+ int i;
+ int offset1;
+ int offset2;
+
+ fir->history[fir->curr_pos] = sample;
+
+ offset2 = fir->curr_pos;
+ offset1 = fir->taps - offset2;
+ y = 0;
+ for (i = fir->taps - 1; i >= offset1; i--)
+ y += fir->coeffs[i] * fir->history[i - offset1];
+ for (; i >= 0; i--)
+ y += fir->coeffs[i] * fir->history[i + offset2];
#endif
- if (fir->curr_pos <= 0)
- fir->curr_pos = fir->taps;
- fir->curr_pos--;
- return (int16_t) (y >> 15);
+ if (fir->curr_pos <= 0)
+ fir->curr_pos = fir->taps;
+ fir->curr_pos--;
+ return (int16_t) (y >> 15);
}
-/*- End of function --------------------------------------------------------*/
-static __inline__ const int16_t *fir32_create(fir32_state_t *fir,
- const int32_t *coeffs,
- int taps)
+static inline const int16_t *fir32_create(struct fir32_state_t *fir,
+ const int32_t *coeffs, int taps)
{
- fir->taps = taps;
- fir->curr_pos = taps - 1;
- fir->coeffs = coeffs;
- fir->history = kcalloc(taps, sizeof(int16_t), GFP_KERNEL);
- return fir->history;
-}
-/*- End of function --------------------------------------------------------*/
-
-static __inline__ void fir32_flush(fir32_state_t *fir)
-{
- memset(fir->history, 0, fir->taps*sizeof(int16_t));
-}
-/*- End of function --------------------------------------------------------*/
-
-static __inline__ void fir32_free(fir32_state_t *fir)
-{
- kfree(fir->history);
-}
-/*- End of function --------------------------------------------------------*/
-
-static __inline__ int16_t fir32(fir32_state_t *fir, int16_t sample)
-{
- int i;
- int32_t y;
- int offset1;
- int offset2;
-
- fir->history[fir->curr_pos] = sample;
- offset2 = fir->curr_pos;
- offset1 = fir->taps - offset2;
- y = 0;
- for (i = fir->taps - 1; i >= offset1; i--)
- y += fir->coeffs[i]*fir->history[i - offset1];
- for ( ; i >= 0; i--)
- y += fir->coeffs[i]*fir->history[i + offset2];
- if (fir->curr_pos <= 0)
- fir->curr_pos = fir->taps;
- fir->curr_pos--;
- return (int16_t) (y >> 15);
+ fir->taps = taps;
+ fir->curr_pos = taps - 1;
+ fir->coeffs = coeffs;
+ fir->history = kcalloc(taps, sizeof(int16_t), GFP_KERNEL);
+ return fir->history;
}
-/*- End of function --------------------------------------------------------*/
-#ifndef __KERNEL__
-static __inline__ const float *fir_float_create(fir_float_state_t *fir,
- const float *coeffs,
- int taps)
+static inline void fir32_flush(struct fir32_state_t *fir)
{
- fir->taps = taps;
- fir->curr_pos = taps - 1;
- fir->coeffs = coeffs;
- fir->history = (float *) malloc(taps*sizeof(float));
- if (fir->history)
- memset(fir->history, '\0', taps*sizeof(float));
- return fir->history;
+ memset(fir->history, 0, fir->taps * sizeof(int16_t));
}
-/*- End of function --------------------------------------------------------*/
-static __inline__ void fir_float_free(fir_float_state_t *fir)
+static inline void fir32_free(struct fir32_state_t *fir)
{
- free(fir->history);
+ kfree(fir->history);
}
-/*- End of function --------------------------------------------------------*/
-static __inline__ int16_t fir_float(fir_float_state_t *fir, int16_t sample)
+static inline int16_t fir32(struct fir32_state_t *fir, int16_t sample)
{
- int i;
- float y;
- int offset1;
- int offset2;
-
- fir->history[fir->curr_pos] = sample;
-
- offset2 = fir->curr_pos;
- offset1 = fir->taps - offset2;
- y = 0;
- for (i = fir->taps - 1; i >= offset1; i--)
- y += fir->coeffs[i]*fir->history[i - offset1];
- for ( ; i >= 0; i--)
- y += fir->coeffs[i]*fir->history[i + offset2];
- if (fir->curr_pos <= 0)
- fir->curr_pos = fir->taps;
- fir->curr_pos--;
- return (int16_t) y;
-}
-/*- End of function --------------------------------------------------------*/
-#endif
-
-#ifdef __cplusplus
+ int i;
+ int32_t y;
+ int offset1;
+ int offset2;
+
+ fir->history[fir->curr_pos] = sample;
+ offset2 = fir->curr_pos;
+ offset1 = fir->taps - offset2;
+ y = 0;
+ for (i = fir->taps - 1; i >= offset1; i--)
+ y += fir->coeffs[i] * fir->history[i - offset1];
+ for (; i >= 0; i--)
+ y += fir->coeffs[i] * fir->history[i + offset2];
+ if (fir->curr_pos <= 0)
+ fir->curr_pos = fir->taps;
+ fir->curr_pos--;
+ return (int16_t) (y >> 15);
}
-#endif
#endif
-/*- End of file ------------------------------------------------------------*/
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff