| /* Copyright (C) Jean-Marc Valin */ |
| /** |
| @file speex_echo.h |
| @brief Echo cancellation |
| */ |
| /* |
| Redistribution and use in source and binary forms, with or without |
| modification, are permitted provided that the following conditions are |
| met: |
| |
| 1. Redistributions of source code must retain the above copyright notice, |
| this list of conditions and the following disclaimer. |
| |
| 2. Redistributions in binary form must reproduce the above copyright |
| notice, this list of conditions and the following disclaimer in the |
| documentation and/or other materials provided with the distribution. |
| |
| 3. The name of the author may not be used to endorse or promote products |
| derived from this software without specific prior written permission. |
| |
| THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, |
| INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
| (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
| SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN |
| ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #ifndef SPEEX_ECHO_H |
| #define SPEEX_ECHO_H |
| |
| #include "speex/speex_types.h" |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| /** Obtain frame size used by the AEC */ |
| #define SPEEX_ECHO_GET_FRAME_SIZE 3 |
| |
| /** Set sampling rate */ |
| #define SPEEX_ECHO_SET_SAMPLING_RATE 24 |
| /** Get sampling rate */ |
| #define SPEEX_ECHO_GET_SAMPLING_RATE 25 |
| |
| |
| /*struct drft_lookup;*/ |
| struct SpeexEchoState_; |
| |
| typedef struct SpeexEchoState_ SpeexEchoState; |
| |
| /** Creates a new echo canceller state */ |
| SpeexEchoState *speex_echo_state_init(int frame_size, int filter_length); |
| |
| /** Destroys an echo canceller state */ |
| void speex_echo_state_destroy(SpeexEchoState *st); |
| |
| /** Performs echo cancellation a frame */ |
| void speex_echo_cancel(SpeexEchoState *st, short *ref, short *echo, short *out, spx_int32_t *Y); |
| |
| /** Reset the echo canceller state */ |
| void speex_echo_state_reset(SpeexEchoState *st); |
| |
| /** Used like the ioctl function to control the echo canceller parameters |
| * |
| * @param state Encoder state |
| * @param request ioctl-type request (one of the SPEEX_ECHO_* macros) |
| * @param ptr Data exchanged to-from function |
| * @return 0 if no error, -1 if request in unknown |
| */ |
| int speex_echo_ctl(SpeexEchoState *st, int request, void *ptr); |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif |