diff options
Diffstat (limited to 'libavcodec/celp_filters.h')
-rw-r--r-- | libavcodec/celp_filters.h | 57 |
1 files changed, 53 insertions, 4 deletions
diff --git a/libavcodec/celp_filters.h b/libavcodec/celp_filters.h index c328258..f644ec3 100644 --- a/libavcodec/celp_filters.h +++ b/libavcodec/celp_filters.h @@ -3,20 +3,20 @@ * * Copyright (c) 2008 Vladimir Voroshilov * - * This file is part of Libav. + * This file is part of FFmpeg. * - * Libav is free software; you can redistribute it and/or + * FFmpeg 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 2.1 of the License, or (at your option) any later version. * - * Libav is distributed in the hope that it will be useful, + * FFmpeg 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 Libav; if not, write to the Free Software + * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ @@ -25,6 +25,55 @@ #include <stdint.h> +typedef struct CELPFContext { + /** + * LP synthesis filter. + * @param[out] out pointer to output buffer + * - the array out[-filter_length, -1] must + * contain the previous result of this filter + * @param filter_coeffs filter coefficients. + * @param in input signal + * @param buffer_length amount of data to process + * @param filter_length filter length (10 for 10th order LP filter). Must be + * greater than 4 and even. + * + * @note Output buffer must contain filter_length samples of past + * speech data before pointer. + * + * Routine applies 1/A(z) filter to given speech data. + */ + void (*celp_lp_synthesis_filterf)(float *out, const float *filter_coeffs, + const float *in, int buffer_length, + int filter_length); + + /** + * LP zero synthesis filter. + * @param[out] out pointer to output buffer + * @param filter_coeffs filter coefficients. + * @param in input signal + * - the array in[-filter_length, -1] must + * contain the previous input of this filter + * @param buffer_length amount of data to process (should be a multiple of eight) + * @param filter_length filter length (10 for 10th order LP filter; + * should be a multiple of two) + * + * @note Output buffer must contain filter_length samples of past + * speech data before pointer. + * + * Routine applies A(z) filter to given speech data. + */ + void (*celp_lp_zero_synthesis_filterf)(float *out, const float *filter_coeffs, + const float *in, int buffer_length, + int filter_length); + +}CELPFContext; + +/** + * Initialize CELPFContext. + */ +void ff_celp_filter_init(CELPFContext *c); +void ff_celp_filter_init_mips(CELPFContext *c); + /** * Circularly convolve fixed vector with a phase dispersion impulse * response filter (D.6.2 of G.729 and 6.1.5 of AMR). |