From 753cbaf5cec7411bdfe5171404c8586b8015faec Mon Sep 17 00:00:00 2001
From: "Steinar H. Gunderson" <sgunderson@bigfoot.com>
Date: Fri, 4 Mar 2016 00:21:55 +0100
Subject: [PATCH] Make drivers capable of delivering a list of modes, and
 setting them.

---
 bmusb.cpp | 15 +++++++++++++++
 bmusb.h   | 19 +++++++++++++++++++
 2 files changed, 34 insertions(+)

diff --git a/bmusb.cpp b/bmusb.cpp
index 3e31c01..1eeedce 100644
--- a/bmusb.cpp
+++ b/bmusb.cpp
@@ -1230,3 +1230,18 @@ bool decode_video_format(uint16_t video_format, VideoFormat *decoded_video_forma
 	decoded_video_format->frame_rate_den = 1;
 	return false;
 }
+
+vector<VideoMode> BMUSBCapture::get_available_video_modes() const
+{
+	// The USB3 cards autodetect, and seem to have no provision for forcing modes.
+	VideoMode auto_mode;
+	auto_mode.id = 0;
+	auto_mode.name = "Autodetect";
+	auto_mode.autodetect = true;
+	return { auto_mode };
+}
+
+void BMUSBCapture::set_video_mode(uint32_t video_mode_id)
+{
+	assert(video_mode_id == 0);  // Matches get_available_video_modes().
+}
diff --git a/bmusb.h b/bmusb.h
index 17b5bc0..8178ac0 100644
--- a/bmusb.h
+++ b/bmusb.h
@@ -78,6 +78,17 @@ private:
 	std::stack<std::unique_ptr<uint8_t[]>> freelist;  // All of size <frame_size>.
 };
 
+// Represents an input mode you can tune a card to.
+struct VideoMode {
+	uint32_t id = 0;
+	std::string name;
+	bool autodetect = false;  // If true, all the remaining fields are irrelevant.
+	unsigned width = 0, height = 0;
+	unsigned frame_rate_num = 0, frame_rate_den = 0;
+	bool interlaced = false;
+};
+
+// Represents the format of an actual frame coming in.
 struct VideoFormat {
 	uint16_t id = 0;  // For debugging/logging only.
 	unsigned width = 0, height = 0, second_field_start = 0;
@@ -102,6 +113,10 @@ class CaptureInterface {
  public:
 	virtual ~CaptureInterface() {}
 
+	virtual std::vector<VideoMode> get_available_video_modes() const = 0;
+
+	virtual void set_video_mode(uint32_t video_mode_id) = 0;
+
 	// Does not take ownership.
 	virtual void set_video_frame_allocator(FrameAllocator *allocator) = 0;
 
@@ -137,6 +152,10 @@ class BMUSBCapture : public CaptureInterface {
 
 	~BMUSBCapture() {}
 
+	std::vector<VideoMode> get_available_video_modes() const override;
+
+	void set_video_mode(uint32_t video_mode_id) override;
+
 	// Does not take ownership.
 	void set_video_frame_allocator(FrameAllocator *allocator) override
 	{
-- 
2.39.2