243 lines
7.5 KiB
C++
243 lines
7.5 KiB
C++
/*************************************************************************/
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/* audio_stream_preview.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) 2007-2020 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md). */
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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_stream_preview.h"
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/////////////////////
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float AudioStreamPreview::get_length() const {
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return length;
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}
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float AudioStreamPreview::get_max(float p_time, float p_time_next) const {
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if (length == 0)
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return 0;
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int max = preview.size() / 2;
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int time_from = p_time / length * max;
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int time_to = p_time_next / length * max;
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time_from = CLAMP(time_from, 0, max - 1);
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time_to = CLAMP(time_to, 0, max - 1);
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if (time_to <= time_from) {
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time_to = time_from + 1;
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}
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uint8_t vmax = 0;
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for (int i = time_from; i < time_to; i++) {
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uint8_t v = preview[i * 2 + 1];
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if (i == 0 || v > vmax) {
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vmax = v;
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}
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}
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return (vmax / 255.0) * 2.0 - 1.0;
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}
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float AudioStreamPreview::get_min(float p_time, float p_time_next) const {
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if (length == 0)
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return 0;
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int max = preview.size() / 2;
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int time_from = p_time / length * max;
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int time_to = p_time_next / length * max;
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time_from = CLAMP(time_from, 0, max - 1);
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time_to = CLAMP(time_to, 0, max - 1);
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if (time_to <= time_from) {
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time_to = time_from + 1;
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}
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uint8_t vmin = 255;
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for (int i = time_from; i < time_to; i++) {
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uint8_t v = preview[i * 2];
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if (i == 0 || v < vmin) {
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vmin = v;
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}
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}
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return (vmin / 255.0) * 2.0 - 1.0;
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}
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AudioStreamPreview::AudioStreamPreview() {
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length = 0;
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}
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////
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void AudioStreamPreviewGenerator::_update_emit(ObjectID p_id) {
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emit_signal("preview_updated", p_id);
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}
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void AudioStreamPreviewGenerator::_preview_thread(void *p_preview) {
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Preview *preview = (Preview *)p_preview;
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float muxbuff_chunk_s = 0.25;
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int mixbuff_chunk_frames = AudioServer::get_singleton()->get_mix_rate() * muxbuff_chunk_s;
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Vector<AudioFrame> mix_chunk;
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mix_chunk.resize(mixbuff_chunk_frames);
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int frames_total = AudioServer::get_singleton()->get_mix_rate() * preview->preview->length;
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int frames_todo = frames_total;
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preview->playback->start();
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while (frames_todo) {
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int ofs_write = uint64_t(frames_total - frames_todo) * uint64_t(preview->preview->preview.size() / 2) / uint64_t(frames_total);
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int to_read = MIN(frames_todo, mixbuff_chunk_frames);
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int to_write = uint64_t(to_read) * uint64_t(preview->preview->preview.size() / 2) / uint64_t(frames_total);
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to_write = MIN(to_write, (preview->preview->preview.size() / 2) - ofs_write);
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preview->playback->mix(mix_chunk.ptrw(), 1.0, to_read);
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for (int i = 0; i < to_write; i++) {
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float max = -1000;
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float min = 1000;
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int from = uint64_t(i) * to_read / to_write;
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int to = (uint64_t(i) + 1) * to_read / to_write;
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to = MIN(to, to_read);
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from = MIN(from, to_read - 1);
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if (to == from) {
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to = from + 1;
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}
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for (int j = from; j < to; j++) {
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max = MAX(max, mix_chunk[j].l);
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max = MAX(max, mix_chunk[j].r);
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min = MIN(min, mix_chunk[j].l);
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min = MIN(min, mix_chunk[j].r);
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}
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uint8_t pfrom = CLAMP((min * 0.5 + 0.5) * 255, 0, 255);
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uint8_t pto = CLAMP((max * 0.5 + 0.5) * 255, 0, 255);
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preview->preview->preview.write[(ofs_write + i) * 2 + 0] = pfrom;
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preview->preview->preview.write[(ofs_write + i) * 2 + 1] = pto;
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}
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frames_todo -= to_read;
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singleton->call_deferred("_update_emit", preview->id);
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}
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preview->playback->stop();
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preview->generating = false;
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}
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Ref<AudioStreamPreview> AudioStreamPreviewGenerator::generate_preview(const Ref<AudioStream> &p_stream) {
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ERR_FAIL_COND_V(p_stream.is_null(), Ref<AudioStreamPreview>());
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if (previews.has(p_stream->get_instance_id())) {
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return previews[p_stream->get_instance_id()].preview;
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}
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//no preview exists
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previews[p_stream->get_instance_id()] = Preview();
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Preview *preview = &previews[p_stream->get_instance_id()];
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preview->base_stream = p_stream;
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preview->playback = preview->base_stream->instance_playback();
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preview->generating = true;
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preview->id = p_stream->get_instance_id();
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float len_s = preview->base_stream->get_length();
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if (len_s == 0) {
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len_s = 60 * 5; //five minutes
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}
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int frames = AudioServer::get_singleton()->get_mix_rate() * len_s;
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Vector<uint8_t> maxmin;
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int pw = frames / 20;
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maxmin.resize(pw * 2);
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{
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uint8_t *ptr = maxmin.ptrw();
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for (int i = 0; i < pw * 2; i++) {
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ptr[i] = 127;
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}
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}
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preview->preview.instance();
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preview->preview->preview = maxmin;
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preview->preview->length = len_s;
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if (preview->playback.is_valid())
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preview->thread = Thread::create(_preview_thread, preview);
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return preview->preview;
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}
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void AudioStreamPreviewGenerator::_bind_methods() {
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ClassDB::bind_method("_update_emit", &AudioStreamPreviewGenerator::_update_emit);
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ClassDB::bind_method(D_METHOD("generate_preview", "stream"), &AudioStreamPreviewGenerator::generate_preview);
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ADD_SIGNAL(MethodInfo("preview_updated", PropertyInfo(Variant::INT, "obj_id")));
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}
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AudioStreamPreviewGenerator *AudioStreamPreviewGenerator::singleton = nullptr;
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void AudioStreamPreviewGenerator::_notification(int p_what) {
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if (p_what == NOTIFICATION_PROCESS) {
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List<ObjectID> to_erase;
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for (Map<ObjectID, Preview>::Element *E = previews.front(); E; E = E->next()) {
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if (!E->get().generating) {
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if (E->get().thread) {
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Thread::wait_to_finish(E->get().thread);
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E->get().thread = nullptr;
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}
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if (!ObjectDB::get_instance(E->key())) { //no longer in use, get rid of preview
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to_erase.push_back(E->key());
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}
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}
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}
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while (to_erase.front()) {
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previews.erase(to_erase.front()->get());
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to_erase.pop_front();
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}
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}
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}
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AudioStreamPreviewGenerator::AudioStreamPreviewGenerator() {
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singleton = this;
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set_process(true);
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}
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