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126e1336b2
Since the source and sink specification will need to be determined by the AEC algorithm (can it handle multi-channel audio, does it work with a fixed sample rate, etc.), we negotiate these using inout parameters at initialisation time. There is opportunity to make the sink-handling more elegant. Since the sink data isn't used for playback (just processing), we could pass through the data as-is and resample to the required spec before using in the cancellation algorithm. This isn't too important immediately, but would be nice to have.
69 lines
2.5 KiB
C
69 lines
2.5 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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/* 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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/* 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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