gstreamer/ext/webrtcdsp/gstwebrtcechoprobe.cpp

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/*
* WebRTC Audio Processing Elements
*
* Copyright 2016 Collabora Ltd
* @author: Nicolas Dufresne <nicolas.dufresne@collabora.com>
*
* This library 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.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
/**
* SECTION:element-webrtcechoprobe
*
* This echo probe is to be used with the webrtcdsp element. See #gst-plugins-bad-plugins-webrtcdsp
* documentation for more details.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstwebrtcechoprobe.h"
#include <webrtc/modules/interface/module_common_types.h>
#include <gst/audio/audio.h>
GST_DEBUG_CATEGORY_EXTERN (webrtc_dsp_debug);
#define GST_CAT_DEFAULT (webrtc_dsp_debug)
#define MAX_ADAPTER_SIZE (1*1024*1024)
static GstStaticPadTemplate gst_webrtc_echo_probe_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("audio/x-raw, "
"format = (string) " GST_AUDIO_NE (S16) ", "
"layout = (string) interleaved, "
"rate = (int) { 48000, 32000, 16000, 8000 }, "
"channels = (int) [1, MAX]")
);
static GstStaticPadTemplate gst_webrtc_echo_probe_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("audio/x-raw, "
"format = (string) " GST_AUDIO_NE (S16) ", "
"layout = (string) interleaved, "
"rate = (int) { 48000, 32000, 16000, 8000 }, "
"channels = (int) [1, MAX]")
);
G_LOCK_DEFINE_STATIC (gst_aec_probes);
static GList *gst_aec_probes = NULL;
G_DEFINE_TYPE (GstWebrtcEchoProbe, gst_webrtc_echo_probe,
GST_TYPE_AUDIO_FILTER);
static gboolean
gst_webrtc_echo_probe_setup (GstAudioFilter * filter, const GstAudioInfo * info)
{
GstWebrtcEchoProbe *self = GST_WEBRTC_ECHO_PROBE (filter);
GST_LOG_OBJECT (self, "setting format to %s with %i Hz and %i channels",
info->finfo->description, info->rate, info->channels);
GST_WEBRTC_ECHO_PROBE_LOCK (self);
self->info = *info;
/* WebRTC library works with 10ms buffers, compute once this size */
self->period_size = info->bpf * info->rate / 100;
if ((webrtc::AudioFrame::kMaxDataSizeSamples * 2) < self->period_size)
goto period_too_big;
GST_WEBRTC_ECHO_PROBE_UNLOCK (self);
return TRUE;
period_too_big:
GST_WEBRTC_ECHO_PROBE_UNLOCK (self);
GST_WARNING_OBJECT (self, "webrtcdsp format produce too big period "
"(maximum is %" G_GSIZE_FORMAT " samples and we have %u samples), "
"reduce the number of channels or the rate.",
webrtc::AudioFrame::kMaxDataSizeSamples, self->period_size / 2);
return FALSE;
}
static gboolean
gst_webrtc_echo_probe_stop (GstBaseTransform * btrans)
{
GstWebrtcEchoProbe *self = GST_WEBRTC_ECHO_PROBE (btrans);
GST_WEBRTC_ECHO_PROBE_LOCK (self);
gst_adapter_clear (self->adapter);
GST_WEBRTC_ECHO_PROBE_UNLOCK (self);
return TRUE;
}
static gboolean
gst_webrtc_echo_probe_src_event (GstBaseTransform * btrans, GstEvent * event)
{
GstBaseTransformClass *klass;
GstWebrtcEchoProbe *self = GST_WEBRTC_ECHO_PROBE (btrans);
GstClockTime latency;
GstClockTime upstream_latency = 0;
GstQuery *query;
klass = GST_BASE_TRANSFORM_CLASS (gst_webrtc_echo_probe_parent_class);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_LATENCY:
gst_event_parse_latency (event, &latency);
query = gst_query_new_latency ();
if (gst_pad_query (btrans->srcpad, query)) {
gst_query_parse_latency (query, NULL, &upstream_latency, NULL);
if (!GST_CLOCK_TIME_IS_VALID (upstream_latency))
upstream_latency = 0;
}
GST_WEBRTC_ECHO_PROBE_LOCK (self);
self->latency = latency;
self->delay = upstream_latency / GST_MSECOND;
GST_WEBRTC_ECHO_PROBE_UNLOCK (self);
GST_DEBUG_OBJECT (self, "We have a latency of %" GST_TIME_FORMAT
" and delay of %ims", GST_TIME_ARGS (latency),
(gint) (upstream_latency / GST_MSECOND));
break;
default:
break;
}
return klass->src_event (btrans, event);
}
static GstFlowReturn
gst_webrtc_echo_probe_transform_ip (GstBaseTransform * btrans,
GstBuffer * buffer)
{
GstWebrtcEchoProbe *self = GST_WEBRTC_ECHO_PROBE (btrans);
GstBuffer *newbuf = NULL;
GST_WEBRTC_ECHO_PROBE_LOCK (self);
newbuf = gst_buffer_copy (buffer);
/* Moves the buffer timestamp to be in Running time */
GST_BUFFER_PTS (newbuf) = gst_segment_to_running_time (&btrans->segment,
GST_FORMAT_TIME, GST_BUFFER_PTS (buffer));
gst_adapter_push (self->adapter, newbuf);
if (gst_adapter_available (self->adapter) > MAX_ADAPTER_SIZE)
gst_adapter_flush (self->adapter,
gst_adapter_available (self->adapter) - MAX_ADAPTER_SIZE);
GST_WEBRTC_ECHO_PROBE_UNLOCK (self);
return GST_FLOW_OK;
}
static void
gst_webrtc_echo_probe_finalize (GObject * object)
{
GstWebrtcEchoProbe *self = GST_WEBRTC_ECHO_PROBE (object);
G_LOCK (gst_aec_probes);
gst_aec_probes = g_list_remove (gst_aec_probes, self);
G_UNLOCK (gst_aec_probes);
gst_object_unref (self->adapter);
self->adapter = NULL;
G_OBJECT_CLASS (gst_webrtc_echo_probe_parent_class)->finalize (object);
}
static void
gst_webrtc_echo_probe_init (GstWebrtcEchoProbe * self)
{
self->adapter = gst_adapter_new ();
gst_audio_info_init (&self->info);
g_mutex_init (&self->lock);
self->latency = GST_CLOCK_TIME_NONE;
G_LOCK (gst_aec_probes);
gst_aec_probes = g_list_prepend (gst_aec_probes, self);
G_UNLOCK (gst_aec_probes);
}
static void
gst_webrtc_echo_probe_class_init (GstWebrtcEchoProbeClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
GstBaseTransformClass *btrans_class = GST_BASE_TRANSFORM_CLASS (klass);
GstAudioFilterClass *audiofilter_class = GST_AUDIO_FILTER_CLASS (klass);
gobject_class->finalize = gst_webrtc_echo_probe_finalize;
btrans_class->passthrough_on_same_caps = TRUE;
btrans_class->src_event = GST_DEBUG_FUNCPTR (gst_webrtc_echo_probe_src_event);
btrans_class->transform_ip =
GST_DEBUG_FUNCPTR (gst_webrtc_echo_probe_transform_ip);
btrans_class->stop = GST_DEBUG_FUNCPTR (gst_webrtc_echo_probe_stop);
audiofilter_class->setup = GST_DEBUG_FUNCPTR (gst_webrtc_echo_probe_setup);
gst_element_class_add_static_pad_template (element_class,
&gst_webrtc_echo_probe_src_template);
gst_element_class_add_static_pad_template (element_class,
&gst_webrtc_echo_probe_sink_template);
gst_element_class_set_static_metadata (element_class,
"Accoustic Echo Canceller probe",
"Generic/Audio",
"Gathers playback buffers for webrtcdsp",
"Nicolas Dufresne <nicolas.dufrsesne@collabora.com>");
}
GstWebrtcEchoProbe *
gst_webrtc_acquire_echo_probe (const gchar * name)
{
GstWebrtcEchoProbe *ret = NULL;
GList *l;
G_LOCK (gst_aec_probes);
for (l = gst_aec_probes; l; l = l->next) {
GstWebrtcEchoProbe *probe = GST_WEBRTC_ECHO_PROBE (l->data);
GST_WEBRTC_ECHO_PROBE_LOCK (probe);
if (!probe->acquired && g_strcmp0 (GST_OBJECT_NAME (probe), name) == 0) {
probe->acquired = TRUE;
ret = GST_WEBRTC_ECHO_PROBE (gst_object_ref (probe));
GST_WEBRTC_ECHO_PROBE_UNLOCK (probe);
break;
}
GST_WEBRTC_ECHO_PROBE_UNLOCK (probe);
}
G_UNLOCK (gst_aec_probes);
return ret;
}
void
gst_webrtc_release_echo_probe (GstWebrtcEchoProbe * probe)
{
GST_WEBRTC_ECHO_PROBE_LOCK (probe);
probe->acquired = FALSE;
GST_WEBRTC_ECHO_PROBE_UNLOCK (probe);
gst_object_unref (probe);
}
gint
gst_webrtc_echo_probe_read (GstWebrtcEchoProbe * self, GstClockTime rec_time,
gpointer _frame)
{
webrtc::AudioFrame * frame = (webrtc::AudioFrame *) _frame;
GstClockTimeDiff diff;
gsize avail, skip, offset, size;
gint delay = -1;
GST_WEBRTC_ECHO_PROBE_LOCK (self);
if (!GST_CLOCK_TIME_IS_VALID (self->latency))
goto done;
/* In delay agnostic mode, just return 10ms of data */
if (!GST_CLOCK_TIME_IS_VALID (rec_time)) {
avail = gst_adapter_available (self->adapter);
if (avail < self->period_size)
goto done;
size = self->period_size;
skip = 0;
offset = 0;
goto copy;
}
if (gst_adapter_available (self->adapter) == 0) {
diff = G_MAXINT64;
} else {
GstClockTime play_time;
guint64 distance;
play_time = gst_adapter_prev_pts (self->adapter, &distance);
if (GST_CLOCK_TIME_IS_VALID (play_time)) {
play_time += gst_util_uint64_scale_int (distance / self->info.bpf,
GST_SECOND, self->info.rate);
play_time += self->latency;
diff = GST_CLOCK_DIFF (rec_time, play_time) / GST_MSECOND;
} else {
/* We have no timestamp, assume perfect delay */
diff = self->delay;
}
}
avail = gst_adapter_available (self->adapter);
if (diff > self->delay) {
skip = (diff - self->delay) * self->info.rate / 1000 * self->info.bpf;
skip = MIN (self->period_size, skip);
offset = 0;
} else {
skip = 0;
offset = (self->delay - diff) * self->info.rate / 1000 * self->info.bpf;
offset = MIN (avail, offset);
}
size = MIN (avail - offset, self->period_size - skip);
if (size < self->period_size)
memset (frame->data_, 0, self->period_size);
copy:
if (size) {
gst_adapter_copy (self->adapter, (guint8 *) frame->data_ + skip,
offset, size);
gst_adapter_flush (self->adapter, offset + size);
}
frame->num_channels_ = self->info.channels;
frame->sample_rate_hz_ = self->info.rate;
frame->samples_per_channel_ = self->period_size / self->info.bpf;
delay = self->delay;
done:
GST_WEBRTC_ECHO_PROBE_UNLOCK (self);
return delay;
}