godot/servers/audio/effects/audio_stream_generator.cpp
Rémi Verschelde a7f49ac9a1 Update copyright statements to 2020
Happy new year to the wonderful Godot community!

We're starting a new decade with a well-established, non-profit, free
and open source game engine, and tons of further improvements in the
pipeline from hundreds of contributors.

Godot will keep getting better, and we're looking forward to all the
games that the community will keep developing and releasing with it.
2020-01-01 11:16:22 +01:00

213 lines
6.7 KiB
C++

/*************************************************************************/
/* audio_stream_generator.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2020 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.instance();
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;
}
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::REAL, "mix_rate", PROPERTY_HINT_RANGE, "20,192000,1"), "set_mix_rate", "get_mix_rate");
ADD_PROPERTY(PropertyInfo(Variant::REAL, "buffer_length", PROPERTY_HINT_RANGE, "0.01,10,0.01"), "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 PoolVector2Array &p_frames) {
int to_write = p_frames.size();
if (buffer.space_left() < to_write) {
return false;
}
PoolVector2Array::Read r = p_frames.read();
if (sizeof(real_t) == 4) {
//write directly
buffer.write((const AudioFrame *)r.ptr(), 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;
}
void 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();
}
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 = NULL;
skips = 0;
active = false;
mixed = 0;
}