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/*************************************************************************/
/* audio_stream_generator.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2022 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_stream_generator.h"
void AudioStreamGenerator::set_mix_rate(float p_mix_rate) {
mix_rate = p_mix_rate;
}
float AudioStreamGenerator::get_mix_rate() const {
return mix_rate;
}
void AudioStreamGenerator::set_buffer_length(float p_seconds) {
buffer_len = p_seconds;
}
float AudioStreamGenerator::get_buffer_length() const {
return buffer_len;
}
Ref<AudioStreamPlayback> AudioStreamGenerator::instance_playback() {
Ref<AudioStreamGeneratorPlayback> playback;
playback.instantiate();
playback->generator = this;
int target_buffer_size = mix_rate * buffer_len;
playback->buffer.resize(nearest_shift(target_buffer_size));
playback->buffer.clear();
return playback;
}
String AudioStreamGenerator::get_stream_name() const {
return "UserFeed";
}
float AudioStreamGenerator::get_length() const {
return 0;
}
bool AudioStreamGenerator::is_monophonic() const {
return true;
}
void AudioStreamGenerator::_bind_methods() {
ClassDB::bind_method(D_METHOD("set_mix_rate", "hz"), &AudioStreamGenerator::set_mix_rate);
ClassDB::bind_method(D_METHOD("get_mix_rate"), &AudioStreamGenerator::get_mix_rate);
ClassDB::bind_method(D_METHOD("set_buffer_length", "seconds"), &AudioStreamGenerator::set_buffer_length);
ClassDB::bind_method(D_METHOD("get_buffer_length"), &AudioStreamGenerator::get_buffer_length);
ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "mix_rate", PROPERTY_HINT_RANGE, "20,192000,1,suffix:Hz"), "set_mix_rate", "get_mix_rate");
ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "buffer_length", PROPERTY_HINT_RANGE, "0.01,10,0.01,suffix:s"), "set_buffer_length", "get_buffer_length");
}
AudioStreamGenerator::AudioStreamGenerator() {
mix_rate = 44100;
buffer_len = 0.5;
}
////////////////
bool AudioStreamGeneratorPlayback::push_frame(const Vector2 &p_frame) {
if (buffer.space_left() < 1) {
return false;
}
AudioFrame f = p_frame;
buffer.write(&f, 1);
return true;
}
bool AudioStreamGeneratorPlayback::can_push_buffer(int p_frames) const {
return buffer.space_left() >= p_frames;
}
bool AudioStreamGeneratorPlayback::push_buffer(const PackedVector2Array &p_frames) {
int to_write = p_frames.size();
if (buffer.space_left() < to_write) {
return false;
}
const Vector2 *r = p_frames.ptr();
if (sizeof(real_t) == 4) {
//write directly
buffer.write((const AudioFrame *)r, to_write);
} else {
//convert from double
AudioFrame buf[2048];
int ofs = 0;
while (to_write) {
int w = MIN(to_write, 2048);
for (int i = 0; i < w; i++) {
buf[i] = r[i + ofs];
}
buffer.write(buf, w);
ofs += w;
to_write -= w;
}
}
return true;
}
int AudioStreamGeneratorPlayback::get_frames_available() const {
return buffer.space_left();
}
int AudioStreamGeneratorPlayback::get_skips() const {
return skips;
}
void AudioStreamGeneratorPlayback::clear_buffer() {
ERR_FAIL_COND(active);
buffer.clear();
mixed = 0;
}
int AudioStreamGeneratorPlayback::_mix_internal(AudioFrame *p_buffer, int p_frames) {
int read_amount = buffer.data_left();
if (p_frames < read_amount) {
read_amount = p_frames;
}
buffer.read(p_buffer, read_amount);
if (read_amount < p_frames) {
//skipped, not ideal
for (int i = read_amount; i < p_frames; i++) {
p_buffer[i] = AudioFrame(0, 0);
}
skips++;
}
mixed += p_frames / generator->get_mix_rate();
return read_amount < p_frames ? read_amount : p_frames;
}
float AudioStreamGeneratorPlayback::get_stream_sampling_rate() {
return generator->get_mix_rate();
}
void AudioStreamGeneratorPlayback::start(float p_from_pos) {
if (mixed == 0.0) {
begin_resample();
}
skips = 0;
active = true;
mixed = 0.0;
}
void AudioStreamGeneratorPlayback::stop() {
active = false;
}
bool AudioStreamGeneratorPlayback::is_playing() const {
return active; //always playing, can't be stopped
}
int AudioStreamGeneratorPlayback::get_loop_count() const {
return 0;
}
float AudioStreamGeneratorPlayback::get_playback_position() const {
return mixed;
}
void AudioStreamGeneratorPlayback::seek(float p_time) {
//no seek possible
}
void AudioStreamGeneratorPlayback::_bind_methods() {
ClassDB::bind_method(D_METHOD("push_frame", "frame"), &AudioStreamGeneratorPlayback::push_frame);
ClassDB::bind_method(D_METHOD("can_push_buffer", "amount"), &AudioStreamGeneratorPlayback::can_push_buffer);
ClassDB::bind_method(D_METHOD("push_buffer", "frames"), &AudioStreamGeneratorPlayback::push_buffer);
ClassDB::bind_method(D_METHOD("get_frames_available"), &AudioStreamGeneratorPlayback::get_frames_available);
ClassDB::bind_method(D_METHOD("get_skips"), &AudioStreamGeneratorPlayback::get_skips);
ClassDB::bind_method(D_METHOD("clear_buffer"), &AudioStreamGeneratorPlayback::clear_buffer);
}
AudioStreamGeneratorPlayback::AudioStreamGeneratorPlayback() {
generator = nullptr;
skips = 0;
active = false;
mixed = 0;
}
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