// The actual video mixer, running in its own separate background thread.
#include <epoxy/gl.h>
+#undef Success
+#include <movit/effect_chain.h>
#include <functional>
#include "bmusb.h"
+#include "h264encode.h"
+#include "pbo_frame_allocator.h"
+#include "ref_counted_frame.h"
#include "ref_counted_gl_sync.h"
#define NUM_CARDS 2
namespace movit {
-class Effect;
-class ResourcePool;
+class YCbCrInput;
}
class QOpenGLContext;
-class QSurface;
+class QSurfaceFormat;
class Mixer {
public:
- void start(QSurface *surface, QSurface *surface2, QSurface *surface3, QSurface *surface4);
+ // The surface format is used for offscreen destinations for OpenGL contexts we need.
+ Mixer(const QSurfaceFormat &format);
+ ~Mixer();
+ void start();
void quit();
enum Source {
};
void cut(Source source);
+ enum Output {
+ OUTPUT_LIVE = 0,
+ OUTPUT_PREVIEW,
+ NUM_OUTPUTS
+ };
+
struct DisplayFrame {
GLuint texnum;
RefCountedGLsync ready_fence; // Asserted when the texture is done rendering.
};
// Implicitly frees the previous one if there's a new frame available.
- bool get_display_frame(DisplayFrame *frame);
+ bool get_display_frame(Output output, DisplayFrame *frame) {
+ return output_channel[output].get_display_frame(frame);
+ }
typedef std::function<void()> new_frame_ready_callback_t;
- void set_frame_ready_fallback(new_frame_ready_callback_t callback);
+ void set_frame_ready_callback(Output output, new_frame_ready_callback_t callback)
+ {
+ output_channel[output].set_frame_ready_callback(callback);
+ }
+
+ // Ignored for OUTPUT_LIVE.
+ void set_preview_size(Output output, int width, int height)
+ {
+ output_channel[output].set_size(width, height);
+ }
private:
void bm_frame(int card_index, uint16_t timecode,
FrameAllocator::Frame video_frame, size_t video_offset, uint16_t video_format,
FrameAllocator::Frame audio_frame, size_t audio_offset, uint16_t audio_format);
void place_rectangle(movit::Effect *resample_effect, movit::Effect *padding_effect, float x0, float y0, float x1, float y1);
- void thread_func(QSurface *surface, QSurface *surface2, QSurface *surface3, QSurface *surface4);
+ void thread_func();
+ void subsample_chroma(GLuint src_tex, GLuint dst_dst);
+ void release_display_frame(DisplayFrame *frame);
- Source current_source = SOURCE_INPUT1;
+ QSurface *mixer_surface, *h264_encoder_surface;
+ std::unique_ptr<movit::ResourcePool> resource_pool;
+ std::unique_ptr<movit::EffectChain> chain;
+ std::unique_ptr<movit::EffectChain> preview_chain;
+ GLuint cbcr_program_num; // Owned by <resource_pool>.
+ std::unique_ptr<H264Encoder> h264_encoder;
+
+ // Effects part of <chain>. Owned by <chain>.
+ movit::YCbCrInput *input[NUM_CARDS];
+ movit::Effect *resample_effect, *resample2_effect;
+ movit::Effect *padding_effect, *padding2_effect;
- movit::ResourcePool *resource_pool;
+ // Effects part of <preview_chain>. Owned by <preview_chain>.
+ movit::YCbCrInput *preview_input;
- std::mutex display_frame_mutex;
- DisplayFrame current_display_frame, ready_display_frame; // protected by <frame_mutex>
- bool has_current_display_frame = false, has_ready_display_frame = false; // protected by <frame_mutex>
+ Source current_source = SOURCE_INPUT1;
+ int frame = 0;
std::mutex bmusb_mutex;
struct CaptureCard {
BMUSBCapture *usb;
+ std::unique_ptr<PBOFrameAllocator> frame_allocator;
// Threading stuff
- bool thread_initialized;
+ bool thread_initialized = false;
QSurface *surface;
QOpenGLContext *context;
- bool new_data_ready; // Whether new_frame contains anything.
- FrameAllocator::Frame new_frame;
+ bool new_data_ready = false; // Whether new_frame contains anything.
+ RefCountedFrame new_frame;
GLsync new_data_ready_fence; // Whether new_frame is ready for rendering.
std::condition_variable new_data_ready_changed; // Set whenever new_data_ready is changed.
};
CaptureCard cards[NUM_CARDS]; // protected by <bmusb_mutex>
- new_frame_ready_callback_t new_frame_ready_callback;
- bool has_new_frame_ready_callback = false;
+ RefCountedFrame bmusb_current_rendering_frame[NUM_CARDS];
+
+ class OutputChannel {
+ public:
+ void output_frame(GLuint tex, RefCountedGLsync fence);
+ bool get_display_frame(DisplayFrame *frame);
+ void set_frame_ready_callback(new_frame_ready_callback_t callback);
+ void set_size(int width, int height); // Ignored for OUTPUT_LIVE.
+
+ private:
+ friend class Mixer;
+
+ Mixer *parent = nullptr; // Not owned.
+ std::mutex frame_mutex;
+ DisplayFrame current_frame, ready_frame; // protected by <frame_mutex>
+ bool has_current_frame = false, has_ready_frame = false; // protected by <frame_mutex>
+ new_frame_ready_callback_t new_frame_ready_callback;
+ bool has_new_frame_ready_callback = false;
+
+ int width = 1280, height = 720;
+ };
+ OutputChannel output_channel[NUM_OUTPUTS];
std::thread mixer_thread;
- bool should_quit;
+ bool should_quit = false;
};
extern Mixer *global_mixer;