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Diffstat (limited to 'plugins/wma/libwma/mdct.h')
| -rw-r--r-- | plugins/wma/libwma/mdct.h | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/plugins/wma/libwma/mdct.h b/plugins/wma/libwma/mdct.h new file mode 100644 index 00000000..48d1c25a --- /dev/null +++ b/plugins/wma/libwma/mdct.h @@ -0,0 +1,139 @@ +/* + * WMA compatible decoder + * Copyright (c) 2002 The FFmpeg Project. + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#ifndef CODECLIB_MDCT_H_INCLUDED +#define CODECLIB_MDCT_H_INCLUDED + +//#include "types.h" +#include "fft.h" + +void ff_imdct_calc(unsigned int nbits, fixed32 *output, const fixed32 *input); +void ff_imdct_half(unsigned int nbits, fixed32 *output, const fixed32 *input); + +#ifdef CPU_ARM + +/*Sign-15.16 format */ +#define fixmul32b(x, y) \ + ({ int32_t __hi; \ + uint32_t __lo; \ + int32_t __result; \ + asm ("smull %0, %1, %3, %4\n\t" \ + "mov %2, %1, lsl #1" \ + : "=&r" (__lo), "=&r" (__hi), "=r" (__result) \ + : "%r" (x), "r" (y) \ + : "cc" ); \ + __result; \ + }) + +#elif defined(CPU_COLDFIRE) + +static inline int32_t fixmul32b(int32_t x, int32_t y) +{ + asm ( + "mac.l %[x], %[y], %%acc0 \n" /* multiply */ + "movclr.l %%acc0, %[x] \n" /* get higher half */ + : [x] "+d" (x) + : [y] "d" (y) + ); + return x; +} + +#else + +static inline fixed32 fixmul32b(fixed32 x, fixed32 y) +{ + fixed64 temp; + + temp = x; + temp *= y; + + temp >>= 31; //16+31-16 = 31 bits + + return (fixed32)temp; +} +#endif + + +#ifdef CPU_ARM +static inline +void CMUL(fixed32 *x, fixed32 *y, + fixed32 a, fixed32 b, + fixed32 t, fixed32 v) +{ + /* This version loses one bit of precision. Could be solved at the cost + * of 2 extra cycles if it becomes an issue. */ + int x1, y1, l; + asm( + "smull %[l], %[y1], %[b], %[t] \n" + "smlal %[l], %[y1], %[a], %[v] \n" + "rsb %[b], %[b], #0 \n" + "smull %[l], %[x1], %[a], %[t] \n" + "smlal %[l], %[x1], %[b], %[v] \n" + : [l] "=&r" (l), [x1]"=&r" (x1), [y1]"=&r" (y1), [b] "+r" (b) + : [a] "r" (a), [t] "r" (t), [v] "r" (v) + : "cc" + ); + *x = x1 << 1; + *y = y1 << 1; +} +#elif defined CPU_COLDFIRE +static inline +void CMUL(fixed32 *x, fixed32 *y, + fixed32 a, fixed32 b, + fixed32 t, fixed32 v) +{ + asm volatile ("mac.l %[a], %[t], %%acc0;" + "msac.l %[b], %[v], %%acc0;" + "mac.l %[b], %[t], %%acc1;" + "mac.l %[a], %[v], %%acc1;" + "movclr.l %%acc0, %[a];" + "move.l %[a], (%[x]);" + "movclr.l %%acc1, %[a];" + "move.l %[a], (%[y]);" + : [a] "+&r" (a) + : [x] "a" (x), [y] "a" (y), + [b] "r" (b), [t] "r" (t), [v] "r" (v) + : "cc", "memory"); +} +#else +static inline +void CMUL(fixed32 *pre, + fixed32 *pim, + fixed32 are, + fixed32 aim, + fixed32 bre, + fixed32 bim) +{ + //int64_t x,y; + fixed32 _aref = are; + fixed32 _aimf = aim; + fixed32 _bref = bre; + fixed32 _bimf = bim; + fixed32 _r1 = fixmul32b(_bref, _aref); + fixed32 _r2 = fixmul32b(_bimf, _aimf); + fixed32 _r3 = fixmul32b(_bref, _aimf); + fixed32 _r4 = fixmul32b(_bimf, _aref); + *pre = _r1 - _r2; + *pim = _r3 + _r4; + +} +#endif + + +#endif // CODECLIB_MDCT_H_INCLUDED |