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d95794ec8a
As many open source projects have started doing it, we're removing the current year from the copyright notice, so that we don't need to bump it every year. It seems like only the first year of publication is technically relevant for copyright notices, and even that seems to be something that many companies stopped listing altogether (in a version controlled codebase, the commits are a much better source of date of publication than a hardcoded copyright statement). We also now list Godot Engine contributors first as we're collectively the current maintainers of the project, and we clarify that the "exclusive" copyright of the co-founders covers the timespan before opensourcing (their further contributions are included as part of Godot Engine contributors). Also fixed "cf." Frenchism - it's meant as "refer to / see".
236 lines
7.3 KiB
C++
236 lines
7.3 KiB
C++
/**************************************************************************/
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/* audio_rb_resampler.cpp */
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/**************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/**************************************************************************/
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/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
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/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/**************************************************************************/
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#include "audio_rb_resampler.h"
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#include "core/math/math_funcs.h"
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#include "core/os/os.h"
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#include "servers/audio_server.h"
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int AudioRBResampler::get_channel_count() const {
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if (!rb) {
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return 0;
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}
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return channels;
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}
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// Linear interpolation based sample rate conversion (low quality)
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// Note that AudioStreamPlaybackResampled::mix has better algorithm,
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// but it wasn't obvious to integrate that with VideoStreamPlayer
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template <int C>
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uint32_t AudioRBResampler::_resample(AudioFrame *p_dest, int p_todo, int32_t p_increment) {
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uint32_t read = offset & MIX_FRAC_MASK;
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for (int i = 0; i < p_todo; i++) {
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offset = (offset + p_increment) & (((1 << (rb_bits + MIX_FRAC_BITS)) - 1));
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read += p_increment;
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uint32_t pos = offset >> MIX_FRAC_BITS;
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float frac = float(offset & MIX_FRAC_MASK) / float(MIX_FRAC_LEN);
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ERR_FAIL_COND_V(pos >= rb_len, 0);
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uint32_t pos_next = (pos + 1) & rb_mask;
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// since this is a template with a known compile time value (C), conditionals go away when compiling.
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if constexpr (C == 1) {
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float v0 = rb[pos];
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float v0n = rb[pos_next];
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v0 += (v0n - v0) * frac;
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p_dest[i] = AudioFrame(v0, v0);
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}
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if constexpr (C == 2) {
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float v0 = rb[(pos << 1) + 0];
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float v1 = rb[(pos << 1) + 1];
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float v0n = rb[(pos_next << 1) + 0];
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float v1n = rb[(pos_next << 1) + 1];
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v0 += (v0n - v0) * frac;
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v1 += (v1n - v1) * frac;
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p_dest[i] = AudioFrame(v0, v1);
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}
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// This will probably never be used, but added anyway
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if constexpr (C == 4) {
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float v0 = rb[(pos << 2) + 0];
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float v1 = rb[(pos << 2) + 1];
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float v0n = rb[(pos_next << 2) + 0];
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float v1n = rb[(pos_next << 2) + 1];
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v0 += (v0n - v0) * frac;
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v1 += (v1n - v1) * frac;
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p_dest[i] = AudioFrame(v0, v1);
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}
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if constexpr (C == 6) {
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float v0 = rb[(pos * 6) + 0];
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float v1 = rb[(pos * 6) + 1];
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float v0n = rb[(pos_next * 6) + 0];
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float v1n = rb[(pos_next * 6) + 1];
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v0 += (v0n - v0) * frac;
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v1 += (v1n - v1) * frac;
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p_dest[i] = AudioFrame(v0, v1);
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}
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}
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return read >> MIX_FRAC_BITS; //rb_read_pos = offset >> MIX_FRAC_BITS;
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}
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bool AudioRBResampler::mix(AudioFrame *p_dest, int p_frames) {
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if (!rb) {
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return false;
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}
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int32_t increment = (src_mix_rate * MIX_FRAC_LEN) / target_mix_rate;
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int read_space = get_reader_space();
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int target_todo = MIN(get_num_of_ready_frames(), p_frames);
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{
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int src_read = 0;
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switch (channels) {
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case 1:
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src_read = _resample<1>(p_dest, target_todo, increment);
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break;
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case 2:
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src_read = _resample<2>(p_dest, target_todo, increment);
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break;
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case 4:
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src_read = _resample<4>(p_dest, target_todo, increment);
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break;
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case 6:
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src_read = _resample<6>(p_dest, target_todo, increment);
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break;
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}
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if (src_read > read_space) {
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src_read = read_space;
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}
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rb_read_pos.set((rb_read_pos.get() + src_read) & rb_mask);
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// Create fadeout effect for the end of stream (note that it can be because of slow writer)
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if (p_frames - target_todo > 0) {
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for (int i = 0; i < target_todo; i++) {
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p_dest[i] = p_dest[i] * float(target_todo - i) / float(target_todo);
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}
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}
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// Fill zeros (silence) for the rest of frames
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for (int i = target_todo; i < p_frames; i++) {
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p_dest[i] = AudioFrame(0, 0);
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}
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}
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return true;
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}
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int AudioRBResampler::get_num_of_ready_frames() {
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if (!is_ready()) {
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return 0;
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}
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int32_t increment = (src_mix_rate * MIX_FRAC_LEN) / target_mix_rate;
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int read_space = get_reader_space();
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return (int64_t(read_space) << MIX_FRAC_BITS) / increment;
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}
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Error AudioRBResampler::setup(int p_channels, int p_src_mix_rate, int p_target_mix_rate, int p_buffer_msec, int p_minbuff_needed) {
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ERR_FAIL_COND_V(p_channels != 1 && p_channels != 2 && p_channels != 4 && p_channels != 6, ERR_INVALID_PARAMETER);
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int desired_rb_bits = nearest_shift(MAX((p_buffer_msec / 1000.0) * p_src_mix_rate, p_minbuff_needed));
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bool recreate = !rb;
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if (rb && (uint32_t(desired_rb_bits) != rb_bits || channels != uint32_t(p_channels))) {
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memdelete_arr(rb);
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memdelete_arr(read_buf);
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recreate = true;
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}
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if (recreate) {
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channels = p_channels;
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rb_bits = desired_rb_bits;
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rb_len = (1 << rb_bits);
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rb_mask = rb_len - 1;
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const size_t array_size = rb_len * (size_t)p_channels;
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rb = memnew_arr(float, array_size);
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read_buf = memnew_arr(float, array_size);
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}
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src_mix_rate = p_src_mix_rate;
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target_mix_rate = p_target_mix_rate;
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offset = 0;
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rb_read_pos.set(0);
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rb_write_pos.set(0);
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//avoid maybe strange noises upon load
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for (unsigned int i = 0; i < (rb_len * channels); i++) {
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rb[i] = 0;
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read_buf[i] = 0;
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}
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return OK;
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}
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void AudioRBResampler::clear() {
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if (!rb) {
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return;
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}
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//should be stopped at this point but just in case
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memdelete_arr(rb);
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memdelete_arr(read_buf);
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rb = nullptr;
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offset = 0;
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rb_read_pos.set(0);
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rb_write_pos.set(0);
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read_buf = nullptr;
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}
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AudioRBResampler::AudioRBResampler() {
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rb = nullptr;
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offset = 0;
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read_buf = nullptr;
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rb_read_pos.set(0);
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rb_write_pos.set(0);
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rb_bits = 0;
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rb_len = 0;
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rb_mask = 0;
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read_buff_len = 0;
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channels = 0;
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src_mix_rate = 0;
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target_mix_rate = 0;
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}
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AudioRBResampler::~AudioRBResampler() {
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if (rb) {
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memdelete_arr(rb);
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memdelete_arr(read_buf);
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}
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}
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