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/***
This file is part of PulseAudio.
Copyright 2010 Arun Raghavan <arun.raghavan@collabora.co.uk>
PulseAudio 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.
PulseAudio 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 Lesser General Public License
along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
***/
#ifndef fooechocancelhfoo
#define fooechocancelhfoo
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <pulse/sample.h>
#include <pulse/channelmap.h>
#include <pulsecore/core.h>
#include <pulsecore/macro.h>
#ifdef HAVE_SPEEX
#include <speex/speex_echo.h>
#include <speex/speex_preprocess.h>
#endif
#include "adrian.h"
/* Common data structures */
typedef struct pa_echo_canceller_msg pa_echo_canceller_msg;
typedef struct pa_echo_canceller_params pa_echo_canceller_params;
struct pa_echo_canceller_params {
union {
struct {
pa_sample_spec out_ss;
} null;
#ifdef HAVE_SPEEX
struct {
SpeexEchoState *state;
SpeexPreprocessState *pp_state;
} speex;
#endif
#ifdef HAVE_ADRIAN_EC
struct {
uint32_t blocksize;
AEC *aec;
} adrian;
#endif
#ifdef HAVE_WEBRTC
struct {
/* This is a void* so that we don't have to convert this whole file
* to C++ linkage. apm is a pointer to an AudioProcessing object */
void *apm;
unsigned int blocksize; /* in frames */
pa_sample_spec rec_ss, play_ss, out_ss;
float *rec_buffer[PA_CHANNELS_MAX], *play_buffer[PA_CHANNELS_MAX]; /* for deinterleaved buffers */
void *trace_callback;
bool agc;
bool first;
unsigned int agc_start_volume;
} webrtc;
#endif
/* each canceller-specific structure goes here */
};
/* Set this if canceller can do drift compensation. Also see set_drift()
* below */
bool drift_compensation;
};
typedef struct pa_echo_canceller pa_echo_canceller;
struct pa_echo_canceller {
/* Initialise canceller engine. */
bool (*init) (pa_core *c,
pa_echo_canceller *ec,
pa_sample_spec *rec_ss,
pa_channel_map *rec_map,
pa_sample_spec *play_ss,
pa_channel_map *play_map,
pa_sample_spec *out_ss,
pa_channel_map *out_map,
uint32_t *nframes,
const char *args);
/* You should have only one of play()+record() or run() set. The first
* works under the assumption that you'll handle buffering and matching up
* samples yourself. If you set run(), module-echo-cancel will handle
* synchronising the playback and record streams. */
/* Feed the engine 'nframes' playback frames. */
void (*play) (pa_echo_canceller *ec, const uint8_t *play);
/* Feed the engine 'nframes' record frames. nframes processed frames are
* returned in out. */
void (*record) (pa_echo_canceller *ec, const uint8_t *rec, uint8_t *out);
/* Feed the engine nframes playback and record frames, with a reasonable
* effort at keeping the two in sync. nframes processed frames are
* returned in out. */
void (*run) (pa_echo_canceller *ec, const uint8_t *rec, const uint8_t *play, uint8_t *out);
/* Optional callback to set the drift, expressed as the ratio of the
* difference in number of playback and capture samples to the number of
* capture samples, for some instant of time. This is used only if the
* canceller signals that it supports drift compensation, and is called
* before record(). The actual implementation needs to derive drift based
* on point samples -- the individual values are not accurate enough to use
* as-is. */
/* NOTE: the semantics of this function might change in the future. */
void (*set_drift) (pa_echo_canceller *ec, float drift);
/* Free up resources. */
void (*done) (pa_echo_canceller *ec);
/* Structure with common and engine-specific canceller parameters. */
pa_echo_canceller_params params;
/* msgobject that can be used to send messages back to the main thread */
pa_echo_canceller_msg *msg;
};
/* Functions to be used by the canceller analog gain control routines */
pa_volume_t pa_echo_canceller_get_capture_volume(pa_echo_canceller *ec);
void pa_echo_canceller_set_capture_volume(pa_echo_canceller *ec, pa_volume_t volume);
/* Computes EC block size in frames (rounded down to nearest power-of-2) based
* on sample rate and milliseconds. */
uint32_t pa_echo_canceller_blocksize_power2(unsigned rate, unsigned ms);
/* Null canceller functions */
bool pa_null_ec_init(pa_core *c, pa_echo_canceller *ec,
pa_sample_spec *rec_ss, pa_channel_map *rec_map,
pa_sample_spec *play_ss, pa_channel_map *play_map,
pa_sample_spec *out_ss, pa_channel_map *out_map,
uint32_t *nframes, const char *args);
void pa_null_ec_run(pa_echo_canceller *ec, const uint8_t *rec, const uint8_t *play, uint8_t *out);
void pa_null_ec_done(pa_echo_canceller *ec);
#ifdef HAVE_SPEEX
/* Speex canceller functions */
bool pa_speex_ec_init(pa_core *c, pa_echo_canceller *ec,
pa_sample_spec *rec_ss, pa_channel_map *rec_map,
pa_sample_spec *play_ss, pa_channel_map *play_map,
pa_sample_spec *out_ss, pa_channel_map *out_map,
uint32_t *nframes, const char *args);
void pa_speex_ec_run(pa_echo_canceller *ec, const uint8_t *rec, const uint8_t *play, uint8_t *out);
void pa_speex_ec_done(pa_echo_canceller *ec);
#endif
#ifdef HAVE_ADRIAN_EC
/* Adrian Andre's echo canceller */
bool pa_adrian_ec_init(pa_core *c, pa_echo_canceller *ec,
pa_sample_spec *rec_ss, pa_channel_map *rec_map,
pa_sample_spec *play_ss, pa_channel_map *play_map,
pa_sample_spec *out_ss, pa_channel_map *out_map,
uint32_t *nframes, const char *args);
void pa_adrian_ec_run(pa_echo_canceller *ec, const uint8_t *rec, const uint8_t *play, uint8_t *out);
void pa_adrian_ec_done(pa_echo_canceller *ec);
#endif
#ifdef HAVE_WEBRTC
/* WebRTC canceller functions */
PA_C_DECL_BEGIN
bool pa_webrtc_ec_init(pa_core *c, pa_echo_canceller *ec,
pa_sample_spec *rec_ss, pa_channel_map *rec_map,
pa_sample_spec *play_ss, pa_channel_map *play_map,
pa_sample_spec *out_ss, pa_channel_map *out_map,
uint32_t *nframes, const char *args);
void pa_webrtc_ec_play(pa_echo_canceller *ec, const uint8_t *play);
void pa_webrtc_ec_record(pa_echo_canceller *ec, const uint8_t *rec, uint8_t *out);
void pa_webrtc_ec_set_drift(pa_echo_canceller *ec, float drift);
void pa_webrtc_ec_run(pa_echo_canceller *ec, const uint8_t *rec, const uint8_t *play, uint8_t *out);
void pa_webrtc_ec_done(pa_echo_canceller *ec);
PA_C_DECL_END
#endif
#endif /* fooechocancelhfoo */
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