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Add echo-cancel module

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Only implement the null echo cancel implementation for now.
And skeleton webrtc echo cancel implementation

It uses 4 streams arranged as:

 input ---+---> source
          ^
	  |
 sink  ---+---> output

The output of the source is the filtered input of the input stream
(linked a master source) based on the data going from sink to
the output (linked to a master sink).

All streams are arranged in the same group so that the echo canceler
does not have to deal with clock drift. For echo cancelers that can
handle clock drift we might want place the source and sink chains
in different groups.
This commit is contained in:
Wim Taymans 2021-04-26 10:47:02 +02:00
parent 684c1b10f7
commit 3496327e69
5 changed files with 768 additions and 0 deletions
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63
src/modules/module-echo-cancel/aec-webrtc.cc Normal file
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/* PipeWire
*
* Copyright © 2021 Wim Taymans <wim.taymans@gmail.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#include "echo-cancel.h"
struct impl {
uint32_t channels;
};
static void *webrtc_create(struct spa_dict *info, uint32_t channels)
{
struct impl *impl;
impl = (struct impl *)calloc(1, sizeof(struct impl));
impl->channels = channels;
return impl;
}
static void webrtc_destroy(void *ec)
{
free(ec);
}
static int webrtc_run(void *ec, const float *rec[], const float *play[], float *out[], uint32_t n_samples)
{
struct impl *impl = (struct impl*)ec;
uint32_t i;
for (i = 0; i < impl->channels; i++)
memcpy(out[i], rec[i], n_samples * sizeof(float));
return 0;
}
static const struct echo_cancel_info echo_cancel_webrtc_impl = {
.name = "webrtc",
.info = SPA_DICT_INIT(NULL, 0),
.create = webrtc_create,
.destroy = webrtc_destroy,
.run = webrtc_run,
};
const struct echo_cancel_info *echo_cancel_webrtc = &echo_cancel_webrtc_impl;