/*************************************************************************/ /* audio_driver_web.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_driver_web.h" #include "core/config/project_settings.h" #include <emscripten.h> AudioDriverWeb::AudioContext AudioDriverWeb::audio_context; bool AudioDriverWeb::is_available() { return godot_audio_is_available() != 0; } void AudioDriverWeb::_state_change_callback(int p_state) { AudioDriverWeb::audio_context.state = p_state; } void AudioDriverWeb::_latency_update_callback(float p_latency) { AudioDriverWeb::audio_context.output_latency = p_latency; } void AudioDriverWeb::_audio_driver_process(int p_from, int p_samples) { int32_t *stream_buffer = reinterpret_cast<int32_t *>(output_rb); const int max_samples = memarr_len(output_rb); int write_pos = p_from; int to_write = p_samples; if (to_write == 0) { to_write = max_samples; } // High part if (write_pos + to_write > max_samples) { const int samples_high = max_samples - write_pos; audio_server_process(samples_high / channel_count, &stream_buffer[write_pos]); for (int i = write_pos; i < max_samples; i++) { output_rb[i] = float(stream_buffer[i] >> 16) / 32768.f; } to_write -= samples_high; write_pos = 0; } // Leftover audio_server_process(to_write / channel_count, &stream_buffer[write_pos]); for (int i = write_pos; i < write_pos + to_write; i++) { output_rb[i] = float(stream_buffer[i] >> 16) / 32768.f; } } void AudioDriverWeb::_audio_driver_capture(int p_from, int p_samples) { if (get_input_buffer().size() == 0) { return; // Input capture stopped. } const int max_samples = memarr_len(input_rb); int read_pos = p_from; int to_read = p_samples; if (to_read == 0) { to_read = max_samples; } // High part if (read_pos + to_read > max_samples) { const int samples_high = max_samples - read_pos; for (int i = read_pos; i < max_samples; i++) { input_buffer_write(int32_t(input_rb[i] * 32768.f) * (1U << 16)); } to_read -= samples_high; read_pos = 0; } // Leftover for (int i = read_pos; i < read_pos + to_read; i++) { input_buffer_write(int32_t(input_rb[i] * 32768.f) * (1U << 16)); } } Error AudioDriverWeb::init() { int latency = GLOBAL_GET("audio/driver/output_latency"); if (!audio_context.inited) { audio_context.mix_rate = GLOBAL_GET("audio/driver/mix_rate"); audio_context.channel_count = godot_audio_init(&audio_context.mix_rate, latency, &_state_change_callback, &_latency_update_callback); audio_context.inited = true; } mix_rate = audio_context.mix_rate; channel_count = audio_context.channel_count; buffer_length = closest_power_of_2((latency * mix_rate / 1000)); Error err = create(buffer_length, channel_count); if (err != OK) { return err; } if (output_rb) { memdelete_arr(output_rb); } const size_t array_size = buffer_length * (size_t)channel_count; output_rb = memnew_arr(float, array_size); if (!output_rb) { return ERR_OUT_OF_MEMORY; } if (input_rb) { memdelete_arr(input_rb); } input_rb = memnew_arr(float, array_size); if (!input_rb) { return ERR_OUT_OF_MEMORY; } return OK; } void AudioDriverWeb::start() { start(output_rb, memarr_len(output_rb), input_rb, memarr_len(input_rb)); } void AudioDriverWeb::resume() { if (audio_context.state == 0) { // 'suspended' godot_audio_resume(); } } float AudioDriverWeb::get_latency() { return audio_context.output_latency + (float(buffer_length) / mix_rate); } int AudioDriverWeb::get_mix_rate() const { return mix_rate; } AudioDriver::SpeakerMode AudioDriverWeb::get_speaker_mode() const { return get_speaker_mode_by_total_channels(channel_count); } void AudioDriverWeb::finish() { finish_driver(); if (output_rb) { memdelete_arr(output_rb); output_rb = nullptr; } if (input_rb) { memdelete_arr(input_rb); input_rb = nullptr; } } Error AudioDriverWeb::capture_start() { lock(); input_buffer_init(buffer_length); unlock(); if (godot_audio_capture_start()) { return FAILED; } return OK; } Error AudioDriverWeb::capture_stop() { godot_audio_capture_stop(); lock(); input_buffer.clear(); unlock(); return OK; } /// AudioWorkletNode implementation (threads) void AudioDriverWorklet::_audio_thread_func(void *p_data) { AudioDriverWorklet *driver = static_cast<AudioDriverWorklet *>(p_data); const int out_samples = memarr_len(driver->get_output_rb()); const int in_samples = memarr_len(driver->get_input_rb()); int wpos = 0; int to_write = out_samples; int rpos = 0; int to_read = 0; int32_t step = 0; while (!driver->quit) { if (to_read) { driver->lock(); driver->_audio_driver_capture(rpos, to_read); godot_audio_worklet_state_add(driver->state, STATE_SAMPLES_IN, -to_read); driver->unlock(); rpos += to_read; if (rpos >= in_samples) { rpos -= in_samples; } } if (to_write) { driver->lock(); driver->_audio_driver_process(wpos, to_write); godot_audio_worklet_state_add(driver->state, STATE_SAMPLES_OUT, to_write); driver->unlock(); wpos += to_write; if (wpos >= out_samples) { wpos -= out_samples; } } step = godot_audio_worklet_state_wait(driver->state, STATE_PROCESS, step, 1); to_write = out_samples - godot_audio_worklet_state_get(driver->state, STATE_SAMPLES_OUT); to_read = godot_audio_worklet_state_get(driver->state, STATE_SAMPLES_IN); } } Error AudioDriverWorklet::create(int &p_buffer_size, int p_channels) { if (!godot_audio_has_worklet()) { return ERR_UNAVAILABLE; } return (Error)godot_audio_worklet_create(p_channels); } void AudioDriverWorklet::start(float *p_out_buf, int p_out_buf_size, float *p_in_buf, int p_in_buf_size) { godot_audio_worklet_start(p_in_buf, p_in_buf_size, p_out_buf, p_out_buf_size, state); thread.start(_audio_thread_func, this); } void AudioDriverWorklet::lock() { mutex.lock(); } void AudioDriverWorklet::unlock() { mutex.unlock(); } void AudioDriverWorklet::finish_driver() { quit = true; // Ask thread to quit. thread.wait_to_finish(); }