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Diffstat (limited to 'liba52/imdct_mlib.c')
| -rw-r--r-- | liba52/imdct_mlib.c | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/liba52/imdct_mlib.c b/liba52/imdct_mlib.c new file mode 100644 index 0000000000..c24318dbbf --- /dev/null +++ b/liba52/imdct_mlib.c @@ -0,0 +1,139 @@ +/* + * imdct_mlib.c + * Copyright (C) 2000-2001 Michel Lespinasse <walken@zoy.org> + * Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca> + * + * This file is part of a52dec, a free ATSC A-52 stream decoder. + * See http://liba52.sourceforge.net/ for updates. + * + * a52dec is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * a52dec 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 General Public License for more details. + * + * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include "config.h" + +#ifdef LIBA52_MLIB + +#include <mlib_types.h> +#include <mlib_status.h> +#include <mlib_signal.h> +#include <string.h> +#include <inttypes.h> + +#include "a52.h" +#include "a52_internal.h" +#include "attributes.h" + +extern sample_t imdct_window[]; + +void +imdct_do_512_mlib(sample_t data[], sample_t delay[], sample_t bias) +{ + sample_t *buf_real; + sample_t *buf_imag; + sample_t *data_ptr; + sample_t *delay_ptr; + sample_t *window_ptr; + sample_t tmp[256] ATTR_ALIGN (16); + int i; + + memcpy(tmp, data, 256 * sizeof(sample_t)); + mlib_SignalIMDCT_F32(tmp); + + buf_real = tmp; + buf_imag = tmp + 128; + data_ptr = data; + delay_ptr = delay; + window_ptr = imdct_window; + + /* Window and convert to real valued signal */ + for(i=0; i< 64; i++) + { + *data_ptr++ = -buf_imag[64+i] * *window_ptr++ + *delay_ptr++ + bias; + *data_ptr++ = buf_real[64-i-1] * *window_ptr++ + *delay_ptr++ + bias; + } + + for(i=0; i< 64; i++) + { + *data_ptr++ = -buf_real[i] * *window_ptr++ + *delay_ptr++ + bias; + *data_ptr++ = buf_imag[128-i-1] * *window_ptr++ + *delay_ptr++ + bias; + } + + /* The trailing edge of the window goes into the delay line */ + delay_ptr = delay; + + for(i=0; i< 64; i++) + { + *delay_ptr++ = -buf_real[64+i] * *--window_ptr; + *delay_ptr++ = buf_imag[64-i-1] * *--window_ptr; + } + + for(i=0; i<64; i++) + { + *delay_ptr++ = buf_imag[i] * *--window_ptr; + *delay_ptr++ = -buf_real[128-i-1] * *--window_ptr; + } +} + +void +imdct_do_256_mlib(sample_t data[], sample_t delay[], sample_t bias) +{ + sample_t *buf1_real, *buf1_imag; + sample_t *buf2_real, *buf2_imag; + sample_t *data_ptr; + sample_t *delay_ptr; + sample_t *window_ptr; + sample_t tmp[256] ATTR_ALIGN (16); + int i; + + memcpy(tmp, data, 256 * sizeof(sample_t)); + mlib_SignalIMDCTSplit_F32(tmp); + + buf1_real = tmp; + buf1_imag = tmp + 128 + 64; + buf2_real = tmp + 64; + buf2_imag = tmp + 128; + data_ptr = data; + delay_ptr = delay; + window_ptr = imdct_window; + + /* Window and convert to real valued signal */ + for(i=0; i< 64; i++) + { + *data_ptr++ = -buf1_imag[i] * *window_ptr++ + *delay_ptr++ + bias; + *data_ptr++ = buf1_real[64-i-1] * *window_ptr++ + *delay_ptr++ + bias; + } + + for(i=0; i< 64; i++) + { + *data_ptr++ = -buf1_real[i] * *window_ptr++ + *delay_ptr++ + bias; + *data_ptr++ = buf1_imag[64-i-1] * *window_ptr++ + *delay_ptr++ + bias; + } + + delay_ptr = delay; + + for(i=0; i< 64; i++) + { + *delay_ptr++ = -buf2_real[i] * *--window_ptr; + *delay_ptr++ = buf2_imag[64-i-1] * *--window_ptr; + } + + for(i=0; i< 64; i++) + { + *delay_ptr++ = buf2_imag[i] * *--window_ptr; + *delay_ptr++ = -buf2_real[64-i-1] * *--window_ptr; + } +} + +#endif |