From 57c598393780e27915c84ff167d82fc85803ffe2 Mon Sep 17 00:00:00 2001 From: Arun Raghavan Date: Mon, 6 Sep 2010 15:51:20 +0530 Subject: echo-cancel: Split out speex code from the core module This splits out the echo-cancelling core from the PA-specific bits to allow us to plug in other echo-cancellation engines. --- src/modules/echo-cancel/speex.c | 64 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 64 insertions(+) create mode 100644 src/modules/echo-cancel/speex.c (limited to 'src/modules/echo-cancel/speex.c') diff --git a/src/modules/echo-cancel/speex.c b/src/modules/echo-cancel/speex.c new file mode 100644 index 00000000..1b9e76f4 --- /dev/null +++ b/src/modules/echo-cancel/speex.c @@ -0,0 +1,64 @@ +/*** + This file is part of PulseAudio. + + Copyright 2010 Wim Taymans + + Contributor: Arun Raghavan + + 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, write to the Free Software + Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 + USA. +***/ + +#include "echo-cancel.h" + +pa_bool_t pa_speex_ec_init(pa_echo_canceller *ec, pa_sample_spec ss, pa_channel_map map, uint32_t filter_size_ms, uint32_t frame_size_ms) +{ + int framelen, y, rate = ss.rate; + + framelen = (rate * frame_size_ms) / 1000; + /* framelen should be a power of 2, round down to nearest power of two */ + y = 1 << ((8 * sizeof (int)) - 2); + while (y > framelen) + y >>= 1; + framelen = y; + + ec->params.priv.speex.blocksize = framelen * pa_frame_size (&ss); + + pa_log_debug ("Using framelen %d, blocksize %lld, channels %d, rate %d", framelen, (long long) ec->params.priv.speex.blocksize, ss.channels, ss.rate); + + ec->params.priv.speex.state = speex_echo_state_init_mc (framelen, (rate * filter_size_ms) / 1000, ss.channels, ss.channels); + + if (ec->params.priv.speex.state) { + speex_echo_ctl(ec->params.priv.speex.state, SPEEX_ECHO_SET_SAMPLING_RATE, &rate); + return TRUE; + } else + return FALSE; +} + +void pa_speex_ec_run(pa_echo_canceller *ec, uint8_t *rec, uint8_t *play, uint8_t *out) +{ + speex_echo_cancellation(ec->params.priv.speex.state, (const spx_int16_t *) rec, (const spx_int16_t *) play, (spx_int16_t *) out); +} + +void pa_speex_ec_done(pa_echo_canceller *ec) +{ + speex_echo_state_destroy (ec->params.priv.speex.state); + ec->params.priv.speex.state = NULL; +} + +uint32_t pa_speex_ec_get_block_size(pa_echo_canceller *ec) +{ + return ec->params.priv.speex.blocksize; +} -- cgit