1 #ifndef _JPEG_FRAME_VIEW_H
2 #define _JPEG_FRAME_VIEW_H 1
4 #include "frame_on_disk.h"
5 #include "jpeg_frame.h"
6 #include "ycbcr_converter.h"
11 #include <movit/effect_chain.h>
12 #include <movit/flat_input.h>
13 #include <movit/mix_effect.h>
14 #include <movit/ycbcr_input.h>
16 #include <condition_variable>
20 enum CacheMissBehavior {
21 DECODE_IF_NOT_IN_CACHE,
22 RETURN_NULLPTR_IF_NOT_IN_CACHE
25 std::shared_ptr<Frame> decode_jpeg(const std::string &jpeg);
26 std::shared_ptr<Frame> decode_jpeg_with_cache(FrameOnDisk id, CacheMissBehavior cache_miss_behavior, FrameReader *frame_reader, bool *did_decode);
27 std::shared_ptr<Frame> get_black_frame();
29 class JPEGFrameView : public QGLWidget {
33 JPEGFrameView(QWidget *parent);
36 void setFrame(unsigned stream_idx, FrameOnDisk frame, FrameOnDisk secondary_frame = {}, float fade_alpha = 0.0f);
37 void setFrame(std::shared_ptr<Frame> frame);
39 void mousePressEvent(QMouseEvent *event) override;
41 unsigned get_stream_idx() const { return current_stream_idx; }
43 void setDecodedFrame(std::shared_ptr<Frame> frame, std::shared_ptr<Frame> secondary_frame, float fade_alpha);
44 void set_overlay(const std::string &text); // Blank for none.
50 void initializeGL() override;
51 void resizeGL(int width, int height) override;
52 void paintGL() override;
55 void jpeg_decoder_thread_func();
57 FrameReader frame_reader;
59 // The stream index of the latest frame we displayed.
60 unsigned current_stream_idx = 0;
62 std::unique_ptr<YCbCrConverter> ycbcr_converter;
63 movit::EffectChain *current_chain = nullptr; // Owned by ycbcr_converter.
65 std::shared_ptr<Frame> current_frame; // So that we hold on to the pixels.
66 std::shared_ptr<Frame> current_secondary_frame; // Same.
68 static constexpr int overlay_base_width = 16, overlay_base_height = 16;
69 int overlay_width = overlay_base_width, overlay_height = overlay_base_height;
70 std::unique_ptr<QImage> overlay_image; // If nullptr, no overlay.
71 std::unique_ptr<movit::EffectChain> overlay_chain; // Just to get the overlay on screen in the easiest way possible.
72 movit::FlatInput *overlay_input;
73 bool overlay_input_needs_refresh = false;
75 int gl_width, gl_height;
77 std::thread jpeg_decoder_thread;
78 movit::ResourcePool *resource_pool = nullptr;
80 struct PendingDecode {
81 // For actual decodes (only if frame below is nullptr).
82 FrameOnDisk primary, secondary;
83 float fade_alpha; // Irrelevant if secondary.stream_idx == -1.
85 // Already-decoded frames are also sent through PendingDecode,
86 // so that they get drawn in the right order. If frame is nullptr,
87 // it's a real decode.
88 std::shared_ptr<Frame> frame;
91 std::condition_variable any_pending_decodes;
92 std::deque<PendingDecode> pending_decodes; // Under cache_mu.
95 #endif // !defined(_JPEG_FRAME_VIEW_H)