FFmpeg
|
#include <stdint.h>
Go to the source code of this file.
Data Structures | |
struct | CELPFContext |
Functions | |
void | ff_celp_filter_init (CELPFContext *c) |
Initialize CELPFContext. More... | |
void | ff_celp_filter_init_mips (CELPFContext *c) |
void | ff_celp_convolve_circ (int16_t *fc_out, const int16_t *fc_in, const int16_t *filter, int len) |
Circularly convolve fixed vector with a phase dispersion impulse response filter (D.6.2 of G.729 and 6.1.5 of AMR). More... | |
void | ff_celp_circ_addf (float *out, const float *in, const float *lagged, int lag, float fac, int n) |
Add an array to a rotated array. More... | |
int | ff_celp_lp_synthesis_filter (int16_t *out, const int16_t *filter_coeffs, const int16_t *in, int buffer_length, int filter_length, int stop_on_overflow, int shift, int rounder) |
LP synthesis filter. More... | |
void | ff_celp_lp_synthesis_filterf (float *out, const float *filter_coeffs, const float *in, int buffer_length, int filter_length) |
LP synthesis filter. More... | |
void | ff_celp_lp_zero_synthesis_filterf (float *out, const float *filter_coeffs, const float *in, int buffer_length, int filter_length) |
LP zero synthesis filter. More... | |
void ff_celp_filter_init | ( | CELPFContext * | c | ) |
Initialize CELPFContext.
Definition at line 212 of file celp_filters.c.
Referenced by amrnb_decode_init(), and amrwb_decode_init().
void ff_celp_filter_init_mips | ( | CELPFContext * | c | ) |
Definition at line 283 of file celp_filters_mips.c.
Referenced by ff_celp_filter_init().
void ff_celp_convolve_circ | ( | int16_t * | fc_out, |
const int16_t * | fc_in, | ||
const int16_t * | filter, | ||
int | len | ||
) |
Circularly convolve fixed vector with a phase dispersion impulse response filter (D.6.2 of G.729 and 6.1.5 of AMR).
fc_out | vector with filter applied |
fc_in | source vector |
filter | phase filter coefficients |
fc_out[n] = sum(i,0,len-1){ fc_in[i] * filter[(len + n - i)len] }
Definition at line 30 of file celp_filters.c.
Referenced by g729d_get_new_exc().
void ff_celp_circ_addf | ( | float * | out, |
const float * | in, | ||
const float * | lagged, | ||
int | lag, | ||
float | fac, | ||
int | n | ||
) |
Add an array to a rotated array.
out[k] = in[k] + fac * lagged[k-lag] with wrap-around
out | result vector |
in | samples to be added unfiltered |
lagged | samples to be rotated, multiplied and added |
lag | lagged vector delay in the range [0, n] |
fac | scalefactor for lagged samples |
n | number of samples |
Definition at line 50 of file celp_filters.c.
Referenced by anti_sparseness(), and apply_ir_filter().
int ff_celp_lp_synthesis_filter | ( | int16_t * | out, |
const int16_t * | filter_coeffs, | ||
const int16_t * | in, | ||
int | buffer_length, | ||
int | filter_length, | ||
int | stop_on_overflow, | ||
int | shift, | ||
int | rounder | ||
) |
LP synthesis filter.
[out] | out | pointer to output buffer |
filter_coeffs | filter coefficients (-0x8000 <= (3.12) < 0x8000) | |
in | input signal | |
buffer_length | amount of data to process | |
filter_length | filter length (10 for 10th order LP filter) | |
stop_on_overflow | 1 - return immediately if overflow occurs 0 - ignore overflows | |
shift | the result is shifted right by this value | |
rounder | the amount to add for rounding (usually 0x800 or 0xfff) |
Routine applies 1/A(z) filter to given speech data.
Definition at line 60 of file celp_filters.c.
Referenced by decode_frame(), ff_g729_postfilter(), ff_subblock_synthesis(), g723_1_decode_frame(), and get_tilt_comp().
void ff_celp_lp_synthesis_filterf | ( | float * | out, |
const float * | filter_coeffs, | ||
const float * | in, | ||
int | buffer_length, | ||
int | filter_length | ||
) |
LP synthesis filter.
[out] | out | pointer to output buffer
|
filter_coeffs | filter coefficients. | |
in | input signal | |
buffer_length | amount of data to process | |
filter_length | filter length (10 for 10th order LP filter). Must be greater than 4 and even. |
Routine applies 1/A(z) filter to given speech data.
Definition at line 84 of file celp_filters.c.
Referenced by adaptive_cb_search(), cng_decode_frame(), decode(), decode_frame(), eval_ir(), ff_celp_filter_init(), ff_sipr_decode_frame_16k(), fixed_cb_search(), get_match_score(), postfilter(), postfilter_5k0(), qcelp_decode_frame(), ra144_encode_subblock(), and synth_block().
void ff_celp_lp_zero_synthesis_filterf | ( | float * | out, |
const float * | filter_coeffs, | ||
const float * | in, | ||
int | buffer_length, | ||
int | filter_length | ||
) |
LP zero synthesis filter.
[out] | out | pointer to output buffer |
filter_coeffs | filter coefficients. | |
in | input signal
| |
buffer_length | amount of data to process | |
filter_length | filter length (10 for 10th order LP filter) |
Routine applies A(z) filter to given speech data.
Definition at line 199 of file celp_filters.c.
Referenced by ff_celp_filter_init(), postfilter(), and postfilter_5k0().