X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=mixer.h;h=f5e72e42e237a5a1df16152b4a3b28aac34d24fb;hb=26e1ec466d4730b6abc0e20201d704cfdf41a6eb;hp=64a74e2f13d855d0030a19645cdadf95956b9558;hpb=e8918c22dd8cd509d9679d50bfc6bba86661ebb3;p=nageru

diff --git a/mixer.h b/mixer.h
index 64a74e2..f5e72e4 100644
--- a/mixer.h
+++ b/mixer.h
@@ -3,28 +3,34 @@
 
 // The actual video mixer, running in its own separate background thread.
 
+#include <assert.h>
 #include <epoxy/gl.h>
 #undef Success
-#include <stdbool.h>
-#include <stdint.h>
 
 #include <movit/effect_chain.h>
 #include <movit/flat_input.h>
-#include <zita-resampler/resampler.h>
+#include <stdbool.h>
+#include <stdint.h>
+
 #include <atomic>
+#include <chrono>
 #include <condition_variable>
 #include <cstddef>
 #include <functional>
+#include <map>
 #include <memory>
 #include <mutex>
+#include <queue>
 #include <string>
 #include <thread>
 #include <vector>
 
+#include "alsa_output.h"
+#include "audio_mixer.h"
 #include "bmusb/bmusb.h"
-#include "ebu_r128_proc.h"
-#include "h264encode.h"
+#include "defs.h"
 #include "httpd.h"
+#include "input_state.h"
 #include "pbo_frame_allocator.h"
 #include "ref_counted_frame.h"
 #include "ref_counted_gl_sync.h"
@@ -32,10 +38,11 @@
 #include "theme.h"
 #include "timebase.h"
 #include "stereocompressor.h"
-#include "filter.h"
+#include "video_encoder.h"
 
-class H264Encoder;
+class ALSAOutput;
 class QSurface;
+class QuickSyncEncoder;
 namespace movit {
 class Effect;
 class EffectChain;
@@ -46,9 +53,53 @@ class ResourcePool;
 namespace movit {
 class YCbCrInput;
 }
-class QOpenGLContext;
 class QSurfaceFormat;
 
+// For any card that's not the master (where we pick out the frames as they
+// come, as fast as we can process), there's going to be a queue. The question
+// is when we should drop frames from that queue (apart from the obvious
+// dropping if the 16-frame queue should become full), especially given that
+// the frame rate could be lower or higher than the master (either subtly or
+// dramatically). We have two (conflicting) demands:
+//
+//   1. We want to avoid starving the queue.
+//   2. We don't want to add more delay than is needed.
+//
+// Our general strategy is to drop as many frames as we can (helping for #2)
+// that we think is safe for #1 given jitter. To this end, we set a lower floor N,
+// where we assume that if we have N frames in the queue, we're always safe from
+// starvation. (Typically, N will be 0 or 1. It starts off at 0.) If we have
+// more than N frames in the queue after reading out the one we need, we head-drop
+// them to reduce the queue.
+//
+// N is reduced as follows: If the queue has had at least one spare frame for
+// at least 50 (master) frames (ie., it's been too conservative for a second),
+// we reduce N by 1 and reset the timers. TODO: Only do this if N ever actually
+// touched the limit.
+//
+// Whenever the queue is starved (we needed a frame but there was none),
+// and we've been at N since the last starvation, N was obviously too low,
+// so we increment it. We will never set N above 5, though.
+class QueueLengthPolicy {
+public:
+	QueueLengthPolicy() {}
+	void reset(unsigned card_index) {
+		this->card_index = card_index;
+		safe_queue_length = 0;
+		frames_with_at_least_one = 0;
+		been_at_safe_point_since_last_starvation = false;
+	}
+
+	void update_policy(int queue_length);  // Give in -1 for starvation.
+	unsigned get_safe_queue_length() const { return safe_queue_length; }
+
+private:
+	unsigned card_index;  // For debugging only.
+	unsigned safe_queue_length = 0;  // Called N in the comments.
+	unsigned frames_with_at_least_one = 0;
+	bool been_at_safe_point_since_last_starvation = false;
+};
+
 class Mixer {
 public:
 	// The surface format is used for offscreen destinations for OpenGL contexts we need.
@@ -99,12 +150,23 @@ public:
 		output_channel[output].set_frame_ready_callback(callback);
 	}
 
-	typedef std::function<void(float level_lufs, float peak_db,
-	                           float global_level_lufs, float range_low_lufs, float range_high_lufs,
-	                           float auto_gain_staging_db)> audio_level_callback_t;
-	void set_audio_level_callback(audio_level_callback_t callback)
+	// TODO: Should this really be per-channel? Shouldn't it just be called for e.g. the live output?
+	typedef std::function<void(const std::vector<std::string> &)> transition_names_updated_callback_t;
+	void set_transition_names_updated_callback(Output output, transition_names_updated_callback_t callback)
+	{
+		output_channel[output].set_transition_names_updated_callback(callback);
+	}
+
+	typedef std::function<void(const std::string &)> name_updated_callback_t;
+	void set_name_updated_callback(Output output, name_updated_callback_t callback)
 	{
-		audio_level_callback = callback;
+		output_channel[output].set_name_updated_callback(callback);
+	}
+
+	typedef std::function<void(const std::string &)> color_updated_callback_t;
+	void set_color_updated_callback(Output output, color_updated_callback_t callback)
+	{
+		output_channel[output].set_color_updated_callback(callback);
 	}
 
 	std::vector<std::string> get_transition_names()
@@ -122,60 +184,136 @@ public:
 		return theme->get_channel_name(channel);
 	}
 
-	bool get_supports_set_wb(unsigned channel) const
+	std::string get_channel_color(unsigned channel) const
 	{
-		return theme->get_supports_set_wb(channel);
+		return theme->get_channel_color(channel);
 	}
 
-	void set_wb(unsigned channel, double r, double g, double b) const
+	int get_channel_signal(unsigned channel) const
 	{
-		theme->set_wb(channel, r, g, b);
+		return theme->get_channel_signal(channel);
+	}
+
+	int map_signal(unsigned channel)
+	{
+		return theme->map_signal(channel);
 	}
 
-	void set_locut_cutoff(float cutoff_hz)
+	unsigned get_audio_source() const
 	{
-		locut_cutoff_hz = cutoff_hz;
+		return audio_source_channel;
 	}
 
-	float get_limiter_threshold_dbfs()
+	void set_audio_source(unsigned channel)
 	{
-		return limiter_threshold_dbfs;
+		audio_source_channel = channel;
 	}
 
-	float get_compressor_threshold_dbfs()
+	unsigned get_master_clock() const
 	{
-		return compressor_threshold_dbfs;
+		return master_clock_channel;
 	}
 
-	void set_limiter_threshold_dbfs(float threshold_dbfs)
+	void set_master_clock(unsigned channel)
 	{
-		limiter_threshold_dbfs = threshold_dbfs;
+		master_clock_channel = channel;
 	}
 
-	void set_compressor_threshold_dbfs(float threshold_dbfs)
+	void set_signal_mapping(int signal, int card)
 	{
-		compressor_threshold_dbfs = threshold_dbfs;
+		return theme->set_signal_mapping(signal, card);
 	}
 
-	void set_limiter_enabled(bool enabled)
+	bool get_supports_set_wb(unsigned channel) const
+	{
+		return theme->get_supports_set_wb(channel);
+	}
+
+	void set_wb(unsigned channel, double r, double g, double b) const
 	{
-		limiter_enabled = enabled;
+		theme->set_wb(channel, r, g, b);
 	}
 
-	void set_compressor_enabled(bool enabled)
+	// Note: You can also get this through the global variable global_audio_mixer.
+	AudioMixer *get_audio_mixer() { return &audio_mixer; }
+	const AudioMixer *get_audio_mixer() const { return &audio_mixer; }
+
+	void schedule_cut()
 	{
-		compressor_enabled = enabled;
+		should_cut = true;
 	}
 
-	void reset_meters();
+	unsigned get_num_cards() const { return num_cards; }
+
+	std::string get_card_description(unsigned card_index) const {
+		assert(card_index < num_cards);
+		return cards[card_index].capture->get_description();
+	}
+
+	std::map<uint32_t, bmusb::VideoMode> get_available_video_modes(unsigned card_index) const {
+		assert(card_index < num_cards);
+		return cards[card_index].capture->get_available_video_modes();
+	}
+
+	uint32_t get_current_video_mode(unsigned card_index) const {
+		assert(card_index < num_cards);
+		return cards[card_index].capture->get_current_video_mode();
+	}
+
+	void set_video_mode(unsigned card_index, uint32_t mode) {
+		assert(card_index < num_cards);
+		cards[card_index].capture->set_video_mode(mode);
+	}
+
+	void start_mode_scanning(unsigned card_index);
+
+	std::map<uint32_t, std::string> get_available_video_inputs(unsigned card_index) const {
+		assert(card_index < num_cards);
+		return cards[card_index].capture->get_available_video_inputs();
+	}
+
+	uint32_t get_current_video_input(unsigned card_index) const {
+		assert(card_index < num_cards);
+		return cards[card_index].capture->get_current_video_input();
+	}
+
+	void set_video_input(unsigned card_index, uint32_t input) {
+		assert(card_index < num_cards);
+		cards[card_index].capture->set_video_input(input);
+	}
+
+	std::map<uint32_t, std::string> get_available_audio_inputs(unsigned card_index) const {
+		assert(card_index < num_cards);
+		return cards[card_index].capture->get_available_audio_inputs();
+	}
+
+	uint32_t get_current_audio_input(unsigned card_index) const {
+		assert(card_index < num_cards);
+		return cards[card_index].capture->get_current_audio_input();
+	}
+
+	void set_audio_input(unsigned card_index, uint32_t input) {
+		assert(card_index < num_cards);
+		cards[card_index].capture->set_audio_input(input);
+	}
+
+	void change_x264_bitrate(unsigned rate_kbit) {
+		video_encoder->change_x264_bitrate(rate_kbit);
+	}
 
 private:
+	void configure_card(unsigned card_index, bmusb::CaptureInterface *capture, bool is_fake_capture);
 	void bm_frame(unsigned 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);
+		bmusb::FrameAllocator::Frame video_frame, size_t video_offset, bmusb::VideoFormat video_format,
+		bmusb::FrameAllocator::Frame audio_frame, size_t audio_offset, bmusb::AudioFormat audio_format);
+	void bm_hotplug_add(libusb_device *dev);
+	void bm_hotplug_remove(unsigned card_index);
 	void place_rectangle(movit::Effect *resample_effect, movit::Effect *padding_effect, float x0, float y0, float x1, float y1);
 	void thread_func();
-	void process_audio_one_frame();
+	void handle_hotplugged_cards();
+	void schedule_audio_resampling_tasks(unsigned dropped_frames, int num_samples_per_frame, int length_per_frame);
+	void render_one_frame(int64_t duration);
+	void audio_thread_func();
 	void subsample_chroma(GLuint src_tex, GLuint dst_dst);
 	void release_display_frame(DisplayFrame *frame);
 	double pts() { return double(pts_int) / TIMEBASE; }
@@ -186,9 +324,13 @@ private:
 	QSurface *mixer_surface, *h264_encoder_surface;
 	std::unique_ptr<movit::ResourcePool> resource_pool;
 	std::unique_ptr<Theme> theme;
+	std::atomic<unsigned> audio_source_channel{0};
+	std::atomic<unsigned> master_clock_channel{0};
 	std::unique_ptr<movit::EffectChain> display_chain;
 	GLuint cbcr_program_num;  // Owned by <resource_pool>.
-	std::unique_ptr<H264Encoder> h264_encoder;
+	GLuint cbcr_vbo;  // Holds position and texcoord data.
+	GLuint cbcr_position_attribute_index, cbcr_texcoord_attribute_index;
+	std::unique_ptr<VideoEncoder> video_encoder;
 
 	// Effects part of <display_chain>. Owned by <display_chain>.
 	movit::FlatInput *display_input;
@@ -196,28 +338,45 @@ private:
 	int64_t pts_int = 0;  // In TIMEBASE units.
 
 	std::mutex bmusb_mutex;
+	bool has_bmusb_thread = false;
 	struct CaptureCard {
-		BMUSBCapture *usb;
+		bmusb::CaptureInterface *capture = nullptr;
+		bool is_fake_capture;
 		std::unique_ptr<PBOFrameAllocator> frame_allocator;
 
 		// Stuff for the OpenGL context (for texture uploading).
-		QSurface *surface;
-		QOpenGLContext *context;
-
-		bool new_data_ready = false;  // Whether new_frame contains anything.
+		QSurface *surface = nullptr;
+
+		struct NewFrame {
+			RefCountedFrame frame;
+			int64_t length;  // In TIMEBASE units.
+			bool interlaced;
+			unsigned field;  // Which field (0 or 1) of the frame to use. Always 0 for progressive.
+			std::function<void()> upload_func;  // Needs to be called to actually upload the texture to OpenGL.
+			unsigned dropped_frames = 0;  // Number of dropped frames before this one.
+		};
+		std::queue<NewFrame> new_frames;
 		bool should_quit = false;
-		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.
-		unsigned dropped_frames = 0;  // Before new_frame.
+		std::condition_variable new_frames_changed;  // Set whenever new_frames (or should_quit) is changed.
+
+		QueueLengthPolicy queue_length_policy;  // Refers to the "new_frames" queue.
+
+		// Accumulated errors in number of 1/TIMEBASE samples. If OUTPUT_FREQUENCY divided by
+		// frame rate is integer, will always stay zero.
+		unsigned fractional_samples = 0;
 
-		std::mutex audio_mutex;
-		std::unique_ptr<ResamplingQueue> resampling_queue;  // Under audio_mutex.
 		int last_timecode = -1;  // Unwrapped.
 	};
-	CaptureCard cards[MAX_CARDS];  // protected by <bmusb_mutex>
+	CaptureCard cards[MAX_VIDEO_CARDS];  // protected by <bmusb_mutex>
+	AudioMixer audio_mixer;  // Same as global_audio_mixer (see audio_mixer.h).
+	void get_one_frame_from_each_card(unsigned master_card_index, CaptureCard::NewFrame new_frames[MAX_VIDEO_CARDS], bool has_new_frame[MAX_VIDEO_CARDS], int num_samples[MAX_VIDEO_CARDS]);
+
+	InputState input_state;
 
-	RefCountedFrame bmusb_current_rendering_frame[MAX_CARDS];
+	// Cards we have been noticed about being hotplugged, but haven't tried adding yet.
+	// Protected by its own mutex.
+	std::mutex hotplug_mutex;
+	std::vector<libusb_device *> hotplugged_cards;
 
 	class OutputChannel {
 	public:
@@ -225,45 +384,52 @@ private:
 		void output_frame(DisplayFrame frame);
 		bool get_display_frame(DisplayFrame *frame);
 		void set_frame_ready_callback(new_frame_ready_callback_t callback);
+		void set_transition_names_updated_callback(transition_names_updated_callback_t callback);
+		void set_name_updated_callback(name_updated_callback_t callback);
+		void set_color_updated_callback(color_updated_callback_t callback);
 
 	private:
 		friend class Mixer;
 
+		unsigned channel;
 		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;
+		transition_names_updated_callback_t transition_names_updated_callback;
+		name_updated_callback_t name_updated_callback;
+		color_updated_callback_t color_updated_callback;
+
+		std::vector<std::string> last_transition_names;
+		std::string last_name, last_color;
 	};
 	OutputChannel output_channel[NUM_OUTPUTS];
 
 	std::thread mixer_thread;
-	bool should_quit = false;
-
-	audio_level_callback_t audio_level_callback = nullptr;
-	Ebu_r128_proc r128;
+	std::thread audio_thread;
+	std::atomic<bool> should_quit{false};
+	std::atomic<bool> should_cut{false};
 
-	Resampler peak_resampler;
-	std::atomic<float> peak{0.0f};
+	std::unique_ptr<ALSAOutput> alsa;
 
-	StereoFilter locut;  // Default cutoff 150 Hz, 24 dB/oct.
-	std::atomic<float> locut_cutoff_hz;
-
-	// First compressor; takes us up to about -12 dBFS.
-	StereoCompressor level_compressor;
-	float last_gain_staging_db = 0.0f;
-
-	static constexpr float ref_level_dbfs = -14.0f;
-
-	StereoCompressor limiter;
-	std::atomic<float> limiter_threshold_dbfs{ref_level_dbfs + 0.0f};   // 0 dB.
-	std::atomic<bool> limiter_enabled{true};
-	StereoCompressor compressor;
-	std::atomic<float> compressor_threshold_dbfs{ref_level_dbfs - 12.0f};  // -12 dB.
-	std::atomic<bool> compressor_enabled{true};
+	struct AudioTask {
+		int64_t pts_int;
+		int num_samples;
+		bool adjust_rate;
+	};
+	std::mutex audio_mutex;
+	std::condition_variable audio_task_queue_changed;
+	std::queue<AudioTask> audio_task_queue;  // Under audio_mutex.
+
+	// For mode scanning.
+	bool is_mode_scanning[MAX_VIDEO_CARDS]{ false };
+	std::vector<uint32_t> mode_scanlist[MAX_VIDEO_CARDS];
+	unsigned mode_scanlist_index[MAX_VIDEO_CARDS]{ 0 };
+	std::chrono::steady_clock::time_point last_mode_scan_change[MAX_VIDEO_CARDS];
 };
 
 extern Mixer *global_mixer;
+extern bool uses_mlock;
 
 #endif  // !defined(_MIXER_H)