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47e4dd1ec4
This adds Andre Adrian's AEC implementation from his intercom project (http://andreadrian.de/intercom/) as an alternative to the speex echo cancellation routines. Since the implementation was in C++ and not in the form of a library, I have converted the code to C and made a local copy of the implementation. The implementation actually works on floating point data, so we can tweak it to work with both integer and floating point samples (currently we just use S16LE).
83 lines
3.1 KiB
C
83 lines
3.1 KiB
C
/***
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This file is part of PulseAudio.
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Copyright 2010 Arun Raghavan <arun.raghavan@collabora.co.uk>
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PulseAudio is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published
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by the Free Software Foundation; either version 2.1 of the License,
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or (at your option) any later version.
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PulseAudio is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with PulseAudio; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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USA.
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***/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <pulse/sample.h>
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#include <pulse/channelmap.h>
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#include <pulsecore/macro.h>
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#include <speex/speex_echo.h>
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#include "adrian.h"
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/* Common data structures */
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typedef struct pa_echo_canceller_params pa_echo_canceller_params;
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struct pa_echo_canceller_params {
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union {
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struct {
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uint32_t blocksize;
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SpeexEchoState *state;
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} speex;
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struct {
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uint32_t blocksize;
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AEC *aec;
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} adrian;
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/* each canceller-specific structure goes here */
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} priv;
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};
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typedef struct pa_echo_canceller pa_echo_canceller;
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struct pa_echo_canceller {
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pa_bool_t (*init) (pa_echo_canceller *ec,
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pa_sample_spec *source_ss,
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pa_channel_map *source_map,
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pa_sample_spec *sink_ss,
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pa_channel_map *sink_map,
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const char *args);
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void (*run) (pa_echo_canceller *ec, uint8_t *rec, uint8_t *play, uint8_t *out);
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void (*done) (pa_echo_canceller *ec);
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uint32_t (*get_block_size) (pa_echo_canceller *ec);
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pa_echo_canceller_params params;
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};
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/* Speex canceller functions */
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pa_bool_t pa_speex_ec_init(pa_echo_canceller *ec,
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pa_sample_spec *source_ss, pa_channel_map *source_map,
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pa_sample_spec *sink_ss, pa_channel_map *sink_map,
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const char *args);
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void pa_speex_ec_run(pa_echo_canceller *ec, uint8_t *rec, uint8_t *play, uint8_t *out);
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void pa_speex_ec_done(pa_echo_canceller *ec);
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uint32_t pa_speex_ec_get_block_size(pa_echo_canceller *ec);
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/* Adrian Andre's echo canceller */
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pa_bool_t pa_adrian_ec_init(pa_echo_canceller *ec,
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pa_sample_spec *source_ss, pa_channel_map *source_map,
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pa_sample_spec *sink_ss, pa_channel_map *sink_map,
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const char *args);
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void pa_adrian_ec_run(pa_echo_canceller *ec, uint8_t *rec, uint8_t *play, uint8_t *out);
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void pa_adrian_ec_done(pa_echo_canceller *ec);
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uint32_t pa_adrian_ec_get_block_size(pa_echo_canceller *ec);
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