diff options
Diffstat (limited to 'editor/audio_stream_preview.cpp')
| -rw-r--r-- | editor/audio_stream_preview.cpp | 211 |
1 files changed, 211 insertions, 0 deletions
diff --git a/editor/audio_stream_preview.cpp b/editor/audio_stream_preview.cpp new file mode 100644 index 0000000000..6ee4d7f4b0 --- /dev/null +++ b/editor/audio_stream_preview.cpp @@ -0,0 +1,211 @@ +#include "audio_stream_preview.h" + +///////////////////// + +float AudioStreamPreview::get_length() const { + return length; +} +float AudioStreamPreview::get_max(float p_time, float p_time_next) const { + + if (length == 0) + return 0; + + int max = preview.size() / 2; + int time_from = p_time / length * max; + int time_to = p_time_next / length * max; + time_from = CLAMP(time_from, 0, max - 1); + time_to = CLAMP(time_to, 0, max - 1); + + if (time_to <= time_from) { + time_to = time_from + 1; + } + + uint8_t vmax; + + for (int i = time_from; i < time_to; i++) { + + uint8_t v = preview[i * 2 + 1]; + if (i == 0 || v > vmax) { + vmax = v; + } + } + + return (vmax / 255.0) * 2.0 - 1.0; +} +float AudioStreamPreview::get_min(float p_time, float p_time_next) const { + + if (length == 0) + return 0; + + int max = preview.size() / 2; + int time_from = p_time / length * max; + int time_to = p_time_next / length * max; + time_from = CLAMP(time_from, 0, max - 1); + time_to = CLAMP(time_to, 0, max - 1); + + if (time_to <= time_from) { + time_to = time_from + 1; + } + + uint8_t vmin; + + for (int i = time_from; i < time_to; i++) { + + uint8_t v = preview[i * 2]; + if (i == 0 || v < vmin) { + vmin = v; + } + } + + return (vmin / 255.0) * 2.0 - 1.0; +} + +AudioStreamPreview::AudioStreamPreview() { + length = 0; +} + +//// + +void AudioStreamPreviewGenerator::_update_emit(ObjectID p_id) { + emit_signal("preview_updated", p_id); +} + +void AudioStreamPreviewGenerator::_preview_thread(void *p_preview) { + + Preview *preview = (Preview *)p_preview; + + float muxbuff_chunk_s = 0.25; + + int mixbuff_chunk_frames = AudioServer::get_singleton()->get_mix_rate() * muxbuff_chunk_s; + + Vector<AudioFrame> mix_chunk; + mix_chunk.resize(mixbuff_chunk_frames); + + int frames_total = AudioServer::get_singleton()->get_mix_rate() * preview->preview->length; + int frames_todo = frames_total; + + preview->playback->start(); + + while (frames_todo) { + + int ofs_write = uint64_t(frames_total - frames_todo) * uint64_t(preview->preview->preview.size() / 2) / uint64_t(frames_total); + int to_read = MIN(frames_todo, mixbuff_chunk_frames); + int to_write = uint64_t(to_read) * uint64_t(preview->preview->preview.size() / 2) / uint64_t(frames_total); + to_write = MIN(to_write, (preview->preview->preview.size() / 2) - ofs_write); + + preview->playback->mix(mix_chunk.ptrw(), 1.0, to_read); + + for (int i = 0; i < to_write; i++) { + float max = -1000; + float min = 1000; + int from = uint64_t(i) * to_read / to_write; + int to = uint64_t(i + 1) * to_read / to_write; + to = MIN(to, to_read); + from = MIN(from, to_read - 1); + if (to == from) { + to = from + 1; + } + + for (int j = from; j < to; j++) { + + max = MAX(max, mix_chunk[j].l); + max = MAX(max, mix_chunk[j].r); + + min = MIN(min, mix_chunk[j].l); + min = MIN(min, mix_chunk[j].r); + } + + uint8_t pfrom = CLAMP((min * 0.5 + 0.5) * 255, 0, 255); + uint8_t pto = CLAMP((max * 0.5 + 0.5) * 255, 0, 255); + + preview->preview->preview[(ofs_write + i) * 2 + 0] = pfrom; + preview->preview->preview[(ofs_write + i) * 2 + 1] = pto; + } + + frames_todo -= to_read; + singleton->call_deferred("_update_emit", preview->id); + } + + preview->playback->stop(); + + preview->generating = false; +} + +Ref<AudioStreamPreview> AudioStreamPreviewGenerator::generate_preview(const Ref<AudioStream> &p_stream) { + ERR_FAIL_COND_V(p_stream.is_null(), Ref<AudioStreamPreview>()); + + if (previews.has(p_stream->get_instance_id())) { + return previews[p_stream->get_instance_id()].preview; + } + + //no preview exists + + previews[p_stream->get_instance_id()] = Preview(); + + Preview *preview = &previews[p_stream->get_instance_id()]; + preview->base_stream = p_stream; + preview->playback = preview->base_stream->instance_playback(); + preview->generating = true; + preview->id = p_stream->get_instance_id(); + + float len_s = preview->base_stream->get_length(); + if (len_s == 0) { + len_s = 60 * 5; //five minutes + } + + int frames = AudioServer::get_singleton()->get_mix_rate() * len_s; + + Vector<uint8_t> maxmin; + int pw = frames / 20; + maxmin.resize(pw * 2); + { + uint8_t *ptr = maxmin.ptrw(); + for (int i = 0; i < pw * 2; i++) { + ptr[i] = 127; + } + } + + preview->preview.instance(); + preview->preview->preview = maxmin; + preview->preview->length = len_s; + + preview->thread = Thread::create(_preview_thread, preview); + + return preview->preview; +} + +void AudioStreamPreviewGenerator::_bind_methods() { + ClassDB::bind_method("_update_emit", &AudioStreamPreviewGenerator::_update_emit); + ClassDB::bind_method(D_METHOD("generate_preview", "stream"), &AudioStreamPreviewGenerator::generate_preview); + + ADD_SIGNAL(MethodInfo("preview_updated", PropertyInfo(Variant::INT, "obj_id"))); +} + +AudioStreamPreviewGenerator *AudioStreamPreviewGenerator::singleton = NULL; + +void AudioStreamPreviewGenerator::_notification(int p_what) { + if (p_what == NOTIFICATION_PROCESS) { + List<ObjectID> to_erase; + for (Map<ObjectID, Preview>::Element *E = previews.front(); E; E = E->next()) { + if (!E->get().generating) { + if (E->get().thread) { + Thread::wait_to_finish(E->get().thread); + E->get().thread = NULL; + } + if (!ObjectDB::get_instance(E->key())) { //no longer in use, get rid of preview + to_erase.push_back(E->key()); + } + } + } + + while (to_erase.front()) { + previews.erase(to_erase.front()->get()); + to_erase.pop_front(); + } + } +} + +AudioStreamPreviewGenerator::AudioStreamPreviewGenerator() { + singleton = this; + set_process(true); +} |