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Add AudioEffectCapture
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AudioEffectCapture allows access to the microphone and other audio on an audio bus in real-time.

Co-Authored-By: K. S. Ernest (iFire) Lee <[email protected]>
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@lyuma @fire
lyuma and fire committed Feb 2, 2021
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76 changes: 76 additions & 0 deletions doc/classes/AudioEffectCapture.xml
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<?xml version="1.0" encoding="UTF-8" ?>
<class name="AudioEffectCapture" inherits="AudioEffect" version="4.0">
<brief_description>
Captures audio from an audio bus in real-time.
</brief_description>
<description>
AudioEffectCapture is an AudioEffect which copies all audio frames from the attached audio effect bus into its internal ring buffer.
Application code should consume these audio frames from this ring buffer using [method get_buffer] and process it as needed, for example to capture data from a microphone, implement application defined effects, or to transmit audio over the network.
</description>
<tutorials>
</tutorials>
<methods>
<method name="can_get_buffer" qualifiers="const">
<return type="bool">
</return>
<argument index="0" name="frames" type="int">
</argument>
<description>
Returns [code]true[/code] if at least [code]frames[/code] audio frames are available to read in the internal ring buffer.
</description>
</method>
<method name="clear_buffer">
<return type="void">
</return>
<description>
Clears the internal ring buffer.
</description>
</method>
<method name="get_buffer">
<return type="PackedVector2Array">
</return>
<argument index="0" name="frames" type="int">
Number of audio frames to return.
</argument>
<description>
Gets the next [code]frames[/code] audio samples from the internal ring buffer.
Returns a [PackedVector2Array] containing exactly [code]frames[/code] audio samples if available, or an empty [PackedVector2Array] if insufficient data was available.
</description>
</method>
<method name="get_buffer_length_frames" qualifiers="const">
<return type="int">
</return>
<description>
Returns the total size of the internal ring buffer in frames.
</description>
</method>
<method name="get_discarded_frames" qualifiers="const">
<return type="int">
</return>
<description>
Returns the number of audio frames discarded from the audio bus due to full buffer.
</description>
</method>
<method name="get_frames_available" qualifiers="const">
<return type="int">
</return>
<description>
Returns the number of frames available to read using [method get_buffer]
</description>
</method>
<method name="get_pushed_frames" qualifiers="const">
<return type="int">
</return>
<description>
Returns the number of audio frames inserted from the audio bus.
</description>
</method>
</methods>
<members>
<member name="buffer_length" type="float" setter="set_buffer_length" getter="get_buffer_length" default="0.1">
Length of the internal ring buffer, in seconds.
</member>
</members>
<constants>
</constants>
</class>
140 changes: 140 additions & 0 deletions servers/audio/effects/audio_effect_capture.cpp
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/*************************************************************************/
/* audio_effect_capture.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md). */
/* */
/* 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 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 "audio_effect_capture.h"

bool AudioEffectCapture::can_get_buffer(int p_frames) const {
return buffer.data_left() >= p_frames;
}

PackedVector2Array AudioEffectCapture::get_buffer(int p_frames) {
ERR_FAIL_COND_V(!buffer_initialized, PackedVector2Array());
ERR_FAIL_INDEX_V(p_frames, buffer.size(), PackedVector2Array());
int data_left = buffer.data_left();
if (data_left < p_frames || p_frames == 0) {
return PackedVector2Array();
}

PackedVector2Array ret;
ret.resize(p_frames);

Vector<AudioFrame> streaming_data;
streaming_data.resize(p_frames);
buffer.read(streaming_data.ptrw(), p_frames);
for (int32_t i = 0; i < p_frames; i++) {
ret.write[i] = Vector2(streaming_data[i].l, streaming_data[i].r);
}
return ret;
}

void AudioEffectCapture::clear_buffer() {
const int32_t data_left = buffer.data_left();
buffer.advance_read(data_left);
}

void AudioEffectCapture::_bind_methods() {
ClassDB::bind_method(D_METHOD("can_get_buffer", "frames"), &AudioEffectCapture::can_get_buffer);
ClassDB::bind_method(D_METHOD("get_buffer", "frames"), &AudioEffectCapture::get_buffer);
ClassDB::bind_method(D_METHOD("clear_buffer"), &AudioEffectCapture::clear_buffer);
ClassDB::bind_method(D_METHOD("set_buffer_length", "buffer_length_seconds"), &AudioEffectCapture::set_buffer_length);
ClassDB::bind_method(D_METHOD("get_buffer_length"), &AudioEffectCapture::get_buffer_length);
ClassDB::bind_method(D_METHOD("get_frames_available"), &AudioEffectCapture::get_frames_available);
ClassDB::bind_method(D_METHOD("get_discarded_frames"), &AudioEffectCapture::get_discarded_frames);
ClassDB::bind_method(D_METHOD("get_buffer_length_frames"), &AudioEffectCapture::get_buffer_length_frames);
ClassDB::bind_method(D_METHOD("get_pushed_frames"), &AudioEffectCapture::get_pushed_frames);

ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "buffer_length", PROPERTY_HINT_RANGE, "0.01,10,0.01"), "set_buffer_length", "get_buffer_length");
}

Ref<AudioEffectInstance> AudioEffectCapture::instance() {
if (!buffer_initialized) {
float target_buffer_size = AudioServer::get_singleton()->get_mix_rate() * buffer_length_seconds;
ERR_FAIL_COND_V(target_buffer_size <= 0 || target_buffer_size >= (1 << 27), Ref<AudioEffectInstance>());
buffer.resize(nearest_shift((int)target_buffer_size));
buffer_initialized = true;
}

clear_buffer();

Ref<AudioEffectCaptureInstance> ins;
ins.instance();
ins->base = Ref<AudioEffectCapture>(this);

return ins;
}

void AudioEffectCapture::set_buffer_length(float p_buffer_length_seconds) {
ERR_FAIL_COND(buffer_initialized);

buffer_length_seconds = p_buffer_length_seconds;
}

float AudioEffectCapture::get_buffer_length() {
return buffer_length_seconds;
}

int AudioEffectCapture::get_frames_available() const {
ERR_FAIL_COND_V(!buffer_initialized, 0);
return buffer.data_left();
}

int64_t AudioEffectCapture::get_discarded_frames() const {
return discarded_frames;
}

int AudioEffectCapture::get_buffer_length_frames() const {
ERR_FAIL_COND_V(!buffer_initialized, 0);
return buffer.size();
}

int64_t AudioEffectCapture::get_pushed_frames() const {
return pushed_frames;
}

void AudioEffectCaptureInstance::process(const AudioFrame *p_src_frames, AudioFrame *p_dst_frames, int p_frame_count) {
RingBuffer<AudioFrame> &buffer = base->buffer;

for (int i = 0; i < p_frame_count; i++) {
p_dst_frames[i] = p_src_frames[i];
}

if (buffer.space_left() >= p_frame_count) {
// Add incoming audio frames to the IO ring buffer
int32_t ret = buffer.write(p_src_frames, p_frame_count);
ERR_FAIL_COND_MSG(ret != p_frame_count, "Failed to add data to effect capture ring buffer despite sufficient space.");
atomic_add(&base->pushed_frames, p_frame_count);
} else {
atomic_add(&base->discarded_frames, p_frame_count);
}
}

bool AudioEffectCaptureInstance::process_silence() const {
return true;
}
82 changes: 82 additions & 0 deletions servers/audio/effects/audio_effect_capture.h
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/*************************************************************************/
/* audio_effect_capture.h */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md). */
/* */
/* 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 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. */
/*************************************************************************/

#ifndef AUDIO_EFFECT_CAPTURE_H
#define AUDIO_EFFECT_CAPTURE_H

#include "core/config/engine.h"
#include "core/math/audio_frame.h"
#include "core/object/reference.h"
#include "core/templates/vector.h"
#include "servers/audio/audio_effect.h"
#include "servers/audio_server.h"

class AudioEffectCapture;

class AudioEffectCaptureInstance : public AudioEffectInstance {
GDCLASS(AudioEffectCaptureInstance, AudioEffectInstance);
friend class AudioEffectCapture;
Ref<AudioEffectCapture> base;

public:
virtual void process(const AudioFrame *p_src_frames, AudioFrame *p_dst_frames, int p_frame_count) override;
virtual bool process_silence() const override;
};

class AudioEffectCapture : public AudioEffect {
GDCLASS(AudioEffectCapture, AudioEffect)
friend class AudioEffectCaptureInstance;

RingBuffer<AudioFrame> buffer;
uint64_t discarded_frames = 0;
uint64_t pushed_frames = 0;
float buffer_length_seconds = 0.1f;
bool buffer_initialized = false;

protected:
static void _bind_methods();

public:
virtual Ref<AudioEffectInstance> instance() override;

void set_buffer_length(float p_buffer_length_seconds);
float get_buffer_length();

bool can_get_buffer(int p_frames) const;
PackedVector2Array get_buffer(int p_len);
void clear_buffer();

int get_frames_available() const;
int64_t get_discarded_frames() const;
int get_buffer_length_frames() const;
int64_t get_pushed_frames() const;
};

#endif // AUDIO_EFFECT_CAPTURE_H
3 changes: 3 additions & 0 deletions servers/register_server_types.cpp
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Expand Up @@ -36,6 +36,7 @@
#include "audio/audio_effect.h"
#include "audio/audio_stream.h"
#include "audio/effects/audio_effect_amplify.h"
#include "audio/effects/audio_effect_capture.h"
#include "audio/effects/audio_effect_chorus.h"
#include "audio/effects/audio_effect_compressor.h"
#include "audio/effects/audio_effect_delay.h"
Expand Down Expand Up @@ -166,6 +167,8 @@ void register_server_types() {
ClassDB::register_class<AudioEffectRecord>();
ClassDB::register_class<AudioEffectSpectrumAnalyzer>();
ClassDB::register_virtual_class<AudioEffectSpectrumAnalyzerInstance>();

ClassDB::register_class<AudioEffectCapture>();
}

ClassDB::register_virtual_class<RenderingDevice>();
Expand Down

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