godot/servers/audio/effects/audio_effect_capture.cpp

/*************************************************************************/
/*  audio_effect_capture.cpp                                             */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md).   */
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#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.get();
}

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.get();
}

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.");
		base->pushed_frames.add(p_frame_count);
	} else {
		base->discarded_frames.add(p_frame_count);
	}
}

bool AudioEffectCaptureInstance::process_silence() const {
	return true;
}