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streamdeckpp.cc
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streamdeckpp.cc
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#include "streamdeckpp.hh"
using namespace std::string_literals;
namespace streamdeck {
namespace {
struct blob_container {
blob_container(Magick::Blob& blob) : front(static_cast<const char*>(blob.data())), back(front + blob.length()) {}
auto begin() const { return front; }
auto end() const { return back; }
const char* front;
const char* back;
};
} // anonymous namespace
device_type::device_type(const char* path, unsigned width, unsigned height, unsigned cols, unsigned rows, image_format_type imgfmt, unsigned imgreplen, bool hflip, bool vflip)
: pixel_width(width), pixel_height(height), key_cols(cols), key_rows(rows), key_count(rows * cols),
key_image_format(imgfmt), key_hflip(hflip), key_vflip(vflip), image_report_length(imgreplen),
m_path(path), m_d(hid_open_path(m_path))
{
}
device_type::~device_type()
{
close();
}
void device_type::close()
{
if (connected())
hid_close(m_d);
}
Magick::Blob device_type::reformat(Magick::Image&& image)
{
if (key_hflip)
image.transpose();
if (key_vflip)
image.transverse();
auto size = image.size();
if (size.width() != pixel_width || size.height() != pixel_height) {
auto factor = std::min(double(pixel_width) / size.width(), double(pixel_height) / size.height());
Magick::Geometry new_geo(size_t(size.width() * factor), size_t(size.height() * factor));
image.scale(new_geo);
if (new_geo.width() != pixel_width || new_geo.height() != pixel_height) {
Magick::Geometry defgeo(pixel_width, pixel_height);
Magick::Image newimage(defgeo, Magick::Color("black"));
newimage.composite(image, ssize_t(pixel_width - new_geo.width()) / 2, ssize_t(pixel_height - new_geo.height()) / 2);
image.scale(defgeo);
image = newimage;
}
}
if (key_image_format == image_format_type::jpeg)
image.magick("JPEG");
else if (key_image_format == image_format_type::bmp)
image.magick("BMP");
Magick::Blob res;
image.write(&res);
return res;
}
int device_type::register_image(Magick::Image&& image)
{
registered.emplace_back(reformat(std::move(image)));
return registered.size() - 1;
}
int device_type::register_image(const char* fname)
{
return register_image(Magick::Image(fname));
}
template<typename C>
int device_type::set_key_image(unsigned key, const C& data)
{
if (key > key_count)
return -1;
payload_type buffer(image_report_length);
unsigned page = 0;
for (auto srcit = data.begin(); srcit != data.end(); ++page) {
auto destit = add_header(buffer, key, data.end() - srcit, page);
while (srcit != data.end() && destit != buffer.end())
*destit++ = std::byte(*srcit++);
std::fill(destit, buffer.end(), std::byte(0));
if (auto r = write(buffer); r < 0)
return r;
}
return 0;
}
int device_type::set_key_image(unsigned key, Magick::Image&& image)
{
auto blob(reformat(std::move(image)));
return set_key_image(key, blob_container(blob));
}
int device_type::set_key_image(unsigned key, const char* fname)
{
return set_key_image(key, Magick::Image(fname));
}
int device_type::set_key_image(unsigned key, int handle)
{
return set_key_image(key, blob_container(registered[handle]));
}
namespace {
// First generation.
struct gen1_device_type : public device_type {
using base_type = device_type;
const unsigned image_report_length;
static constexpr unsigned header_length = 16;
const unsigned payload_length;
gen1_device_type(const char* path, unsigned width, unsigned height, unsigned cols, unsigned rows, unsigned imgreplen, bool hflip, bool vflip)
: device_type(path, width, height, cols, rows, image_format_type::bmp, imgreplen, hflip, vflip), image_report_length(imgreplen), payload_length(imgreplen - header_length)
{}
payload_type::iterator add_header(payload_type& buffer, unsigned key, unsigned remaining, unsigned page) override final;
std::vector<bool> read() override final;
std::optional<std::vector<bool>> read(int timeout = -1) override final;
void reset() override final;
std::string get_serial_number() override final;
std::string get_firmware_version() override final;
private:
void _set_brightness(std::byte p) override final;
std::string _get_string(std::byte c);
};
// Second generation.
struct gen2_device_type : public device_type {
using base_type = device_type;
static constexpr unsigned image_report_length = 1024;
static constexpr unsigned header_length = 8;
static constexpr unsigned payload_length = image_report_length - header_length;
gen2_device_type(const char* path, unsigned width, unsigned height, unsigned cols, unsigned rows)
: device_type(path, width, height, cols, rows, image_format_type::jpeg, image_report_length, true, true)
{}
payload_type::iterator add_header(payload_type& buffer, unsigned key, unsigned remaining, unsigned page) override final;
std::vector<bool> read() override final;
std::optional<std::vector<bool>> read(int timeout = -1) override final;
void reset() override final;
std::string get_serial_number() override final;
std::string get_firmware_version() override final;
private:
void _set_brightness(std::byte p) override final;
std::string _get_string(std::byte c, size_t off);
};
gen1_device_type::payload_type::iterator gen1_device_type::add_header(payload_type& buffer, unsigned key, unsigned remaining, unsigned page)
{
auto it = buffer.begin();
*it++ = std::byte(0x02);
*it++ = std::byte(0x01);
*it++ = std::byte(page + 1);
*it++ = std::byte(0x00);
*it++ = std::byte(remaining > payload_length ? 0 : 1);
*it++ = std::byte(key + 1);
std::fill_n(it, 10, std::byte(0x00));
return it;
}
std::vector<bool> gen1_device_type::read()
{
std::vector<bool> res(key_count);
std::vector<std::byte> state(1 + key_count);
auto n = base_type::read(state);
std::transform(state.begin() + 1, state.begin() + n, res.begin(), [](auto v){ return v != std::byte(0); });
return res;
}
std::optional<std::vector<bool>> gen1_device_type::read(int timeout)
{
std::vector<bool> res(key_count);
std::vector<std::byte> state(1 + key_count);
auto n = base_type::read(state, timeout);
if (n == 0)
return std::nullopt;
std::transform(state.begin() + 1, state.begin() + n, res.begin(), [](auto v){ return v != std::byte(0); });
return res;
}
void gen1_device_type::reset()
{
const std::array<std::byte,17> req { std::byte(0x0b), std::byte(0x63) };
send_report(req);
}
void gen1_device_type::_set_brightness(std::byte p)
{
const std::array<std::byte,17> req { std::byte(0x05), std::byte(0x55), std::byte(0xaa), std::byte(0xd1), std::byte(0x01), p };
send_report(req);
}
std::string gen1_device_type::_get_string(std::byte cmd)
{
std::array<std::byte,17> buf { cmd };
auto len = get_report(buf);
return len > 5 ? std::string(reinterpret_cast<const char*>(buf.data()) + 5) : "";
}
std::string gen1_device_type::get_serial_number()
{
return _get_string(std::byte(0x03));
}
std::string gen1_device_type::get_firmware_version()
{
return _get_string(std::byte(0x04));
}
gen2_device_type::payload_type::iterator gen2_device_type::add_header(payload_type& buffer, unsigned key, unsigned remaining, unsigned page)
{
auto it = buffer.begin();
*it++ = std::byte(0x02);
*it++ = std::byte(0x07);
*it++ = std::byte(key);
if (remaining > payload_length) {
*it++ = std::byte(0x00);
*it++ = std::byte(payload_length & 0xff);
*it++ = std::byte(payload_length >> 8);
} else {
*it++ = std::byte(0x01);
*it++ = std::byte(remaining & 0xff);
*it++ = std::byte(remaining >> 8);
}
*it++ = std::byte(page & 0xff);
*it++ = std::byte(page >> 8);
return it;
}
std::vector<bool> gen2_device_type::read()
{
std::vector<bool> res(key_count);
std::vector<std::byte> state(4 + key_count);
int n;
while ((n = base_type::read(state)) < 4)
continue;
std::transform(state.begin() + 4, state.begin() + n, res.begin(), [](auto v){ return v != std::byte(0); });
return res;
}
std::optional<std::vector<bool>> gen2_device_type::read(int timeout)
{
std::vector<bool> res(key_count);
std::vector<std::byte> state(4 + key_count);
auto n = base_type::read(state, timeout);
if (n == 0)
return std::nullopt;
std::transform(state.begin() + 4, state.begin() + n, res.begin(), [](auto v){ return v != std::byte(0); });
return res;
}
void gen2_device_type::reset()
{
const std::array<std::byte,32> req { std::byte(0x03), std::byte(0x02) };
send_report(req);
}
void gen2_device_type::_set_brightness(std::byte p)
{
const std::array<std::byte,32> req { std::byte(0x03), std::byte(0x08), p };
send_report(req);
}
std::string gen2_device_type::_get_string(std::byte cmd, size_t off)
{
std::array<std::byte,32> buf { cmd };
auto len = get_report(buf);
return len >= 0 && size_t(len) > off ? std::string(reinterpret_cast<const char*>(buf.data()) + off) : "";
}
std::string gen2_device_type::get_serial_number()
{
return _get_string(std::byte(0x06), 2);
}
std::string gen2_device_type::get_firmware_version()
{
return _get_string(std::byte(0x05), 6);
}
template<unsigned short D>
struct specific_device_type;
// StreamDeck Original
template<>
struct specific_device_type<product_streamdeck_original> final : public gen1_device_type {
using base_type = gen1_device_type;
static constexpr unsigned image_report_length = 8191;
specific_device_type(const char* path) : base_type(path, 72, 72, 5, 3, image_report_length, true, true) {}
};
// StreamDeck Original V2
template<>
struct specific_device_type<product_streamdeck_original_v2> final : public gen2_device_type {
using base_type = gen2_device_type;
specific_device_type(const char* path) : base_type(path, 72, 72, 5, 3) {}
};
// StreamDeck Mini
template<>
struct specific_device_type<product_streamdeck_mini> final : public gen1_device_type {
using base_type = gen1_device_type;
static constexpr unsigned image_report_length = 1024;
specific_device_type(const char* path) : base_type(path, 80, 80, 3, 2, image_report_length, false, true) {}
};
// StreamDeck XL
template<>
struct specific_device_type<product_streamdeck_xl> final : public gen2_device_type {
using base_type = gen2_device_type;
specific_device_type(const char* path) : base_type(path, 96, 96, 8, 4) {}
};
constexpr auto products = std::experimental::make_array(product_streamdeck_original,
product_streamdeck_original_v2,
product_streamdeck_mini,
product_streamdeck_xl);
template<size_t N = 0>
std::unique_ptr<device_type> get_device(unsigned short product_id, const char* path)
{
if constexpr (N == products.size())
return nullptr;
else {
if (product_id == products[N])
return std::make_unique<specific_device_type<products[N]>>(path);
return get_device<N + 1>(product_id, path);
}
}
} // anonymous namespace
context::context()
{
if (auto r = hid_init(); r < 0)
throw std::runtime_error("hid_init failed with "s + std::to_string(r));
devs = hid_enumerate(vendor_elgato, 0);
for (auto p = devs; p != nullptr; p = p->next)
if (auto ap = get_device(p->product_id, p->path); ap)
devinfo.emplace_back(std::move(ap));
Magick::InitializeMagick(nullptr);
}
context::~context()
{
devinfo.clear();
if (devs)
hid_free_enumeration(devs);
hid_exit();
}
} // namespace streamdeck