kmsutils: add VideoDevice
diff --git a/kms++util/inc/kms++util/videodevice.h b/kms++util/inc/kms++util/videodevice.h
new file mode 100644
index 0000000..68e2b01
--- /dev/null
+++ b/kms++util/inc/kms++util/videodevice.h
@@ -0,0 +1,86 @@
+#pragma once
+
+#include <string>
+#include <kms++/kms++.h>
+
+class VideoStreamer;
+
+class VideoDevice
+{
+public:
+ struct VideoFrameSize
+ {
+ uint32_t min_w, max_w, step_w;
+ uint32_t min_h, max_h, step_h;
+ };
+
+ VideoDevice(const std::string& dev);
+ VideoDevice(int fd);
+ ~VideoDevice();
+
+ VideoDevice(const VideoDevice& other) = delete;
+ VideoDevice& operator=(const VideoDevice& other) = delete;
+
+ VideoStreamer* get_capture_streamer();
+ VideoStreamer* get_output_streamer();
+
+ std::vector<std::tuple<uint32_t, uint32_t>> get_discrete_frame_sizes(kms::PixelFormat fmt);
+ VideoFrameSize get_frame_sizes(kms::PixelFormat fmt);
+
+ int fd() const { return m_fd; }
+ bool has_capture() const { return m_has_capture; }
+ bool has_output() const { return m_has_output; }
+ bool has_m2m() const { return m_has_m2m; }
+
+ static std::vector<std::string> get_capture_devices();
+ static std::vector<std::string> get_m2m_devices();
+
+private:
+ int m_fd;
+
+ bool m_has_capture;
+ bool m_has_mplane_capture;
+
+ bool m_has_output;
+ bool m_has_mplane_output;
+
+ bool m_has_m2m;
+ bool m_has_mplane_m2m;
+
+ std::vector<kms::DumbFramebuffer*> m_capture_fbs;
+ std::vector<kms::DumbFramebuffer*> m_output_fbs;
+
+ VideoStreamer* m_capture_streamer;
+ VideoStreamer* m_output_streamer;
+};
+
+class VideoStreamer
+{
+public:
+ enum class StreamerType {
+ CaptureSingle,
+ CaptureMulti,
+ OutputSingle,
+ OutputMulti,
+ };
+
+ VideoStreamer(int fd, StreamerType type);
+
+ std::vector<std::string> get_ports();
+ void set_port(uint32_t index);
+
+ std::vector<kms::PixelFormat> get_formats();
+ void set_format(kms::PixelFormat fmt, uint32_t width, uint32_t height);
+ void set_queue_size(uint32_t queue_size);
+ void queue(kms::DumbFramebuffer* fb);
+ kms::DumbFramebuffer* dequeue();
+ void stream_on();
+ void stream_off();
+
+ int fd() const { return m_fd; }
+
+private:
+ int m_fd;
+ StreamerType m_type;
+ std::vector<kms::DumbFramebuffer*> m_fbs;
+};
diff --git a/kms++util/src/videodevice.cpp b/kms++util/src/videodevice.cpp
new file mode 100644
index 0000000..8cc18dc
--- /dev/null
+++ b/kms++util/src/videodevice.cpp
@@ -0,0 +1,460 @@
+#include <string>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <linux/videodev2.h>
+#include <sys/ioctl.h>
+#include <unistd.h>
+
+#include <kms++/kms++.h>
+#include <kms++util/kms++util.h>
+#include <kms++util/videodevice.h>
+
+using namespace std;
+using namespace kms;
+
+/* V4L2 helper funcs */
+static vector<PixelFormat> v4l2_get_formats(int fd, uint32_t buf_type)
+{
+ vector<PixelFormat> v;
+
+ v4l2_fmtdesc desc { };
+ desc.type = buf_type;
+
+ while (ioctl(fd, VIDIOC_ENUM_FMT, &desc) == 0) {
+ v.push_back((PixelFormat)desc.pixelformat);
+ desc.index++;
+ }
+
+ return v;
+}
+
+static void v4l2_set_format(int fd, PixelFormat fmt, uint32_t width, uint32_t height, uint32_t buf_type)
+{
+ int r;
+
+ v4l2_format v4lfmt { };
+
+ v4lfmt.type = buf_type;
+ r = ioctl(fd, VIDIOC_G_FMT, &v4lfmt);
+ ASSERT(r == 0);
+
+ const PixelFormatInfo& pfi = get_pixel_format_info(fmt);
+
+ bool mplane = buf_type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE || buf_type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
+
+ if (mplane) {
+ v4l2_pix_format_mplane& mp = v4lfmt.fmt.pix_mp;
+
+ mp.pixelformat = (uint32_t)fmt;
+ mp.width = width;
+ mp.height = height;
+
+ mp.num_planes = pfi.num_planes;
+
+ for (unsigned i = 0; i < pfi.num_planes; ++i) {
+ const PixelFormatPlaneInfo& pfpi = pfi.planes[i];
+ v4l2_plane_pix_format& p = mp.plane_fmt[i];
+
+ p.bytesperline = width * pfpi.bitspp / 8;
+ p.sizeimage = p.bytesperline * height / pfpi.ysub;
+ }
+
+ r = ioctl(fd, VIDIOC_S_FMT, &v4lfmt);
+ ASSERT(r == 0);
+
+ ASSERT(mp.pixelformat == (uint32_t)fmt);
+ ASSERT(mp.width == width);
+ ASSERT(mp.height == height);
+
+ ASSERT(mp.num_planes == pfi.num_planes);
+
+ for (unsigned i = 0; i < pfi.num_planes; ++i) {
+ const PixelFormatPlaneInfo& pfpi = pfi.planes[i];
+ v4l2_plane_pix_format& p = mp.plane_fmt[i];
+
+ ASSERT(p.bytesperline == width * pfpi.bitspp / 8);
+ ASSERT(p.sizeimage == p.bytesperline * height / pfpi.ysub);
+ }
+ } else {
+ ASSERT(pfi.num_planes == 1);
+
+ v4lfmt.fmt.pix.pixelformat = (uint32_t)fmt;
+ v4lfmt.fmt.pix.width = width;
+ v4lfmt.fmt.pix.height = height;
+ v4lfmt.fmt.pix.bytesperline = width * pfi.planes[0].bitspp / 8;
+
+ r = ioctl(fd, VIDIOC_S_FMT, &v4lfmt);
+ ASSERT(r == 0);
+
+ ASSERT(v4lfmt.fmt.pix.pixelformat == (uint32_t)fmt);
+ ASSERT(v4lfmt.fmt.pix.width == width);
+ ASSERT(v4lfmt.fmt.pix.height == height);
+ ASSERT(v4lfmt.fmt.pix.bytesperline == width * pfi.planes[0].bitspp / 8);
+ }
+}
+
+static void v4l2_request_bufs(int fd, uint32_t queue_size, uint32_t buf_type)
+{
+ v4l2_requestbuffers v4lreqbuf { };
+ v4lreqbuf.type = buf_type;
+ v4lreqbuf.memory = V4L2_MEMORY_DMABUF;
+ v4lreqbuf.count = queue_size;
+ int r = ioctl(fd, VIDIOC_REQBUFS, &v4lreqbuf);
+ ASSERT(r == 0);
+ ASSERT(v4lreqbuf.count == queue_size);
+}
+
+static void v4l2_queue_dmabuf(int fd, uint32_t index, DumbFramebuffer* fb, uint32_t buf_type)
+{
+ v4l2_buffer buf { };
+ buf.type = buf_type;
+ buf.memory = V4L2_MEMORY_DMABUF;
+ buf.index = index;
+
+ const PixelFormatInfo& pfi = get_pixel_format_info(fb->format());
+
+ bool mplane = buf_type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE || buf_type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
+
+ if (mplane) {
+ buf.length = pfi.num_planes;
+
+ v4l2_plane planes[4] { };
+ buf.m.planes = planes;
+
+ for (unsigned i = 0; i < pfi.num_planes; ++i) {
+ planes[i].m.fd = fb->prime_fd(i);
+ planes[i].bytesused = fb->size(i);
+ planes[i].length = fb->size(i);
+ }
+
+ int r = ioctl(fd, VIDIOC_QBUF, &buf);
+ ASSERT(r == 0);
+ } else {
+ buf.m.fd = fb->prime_fd(0);
+
+ int r = ioctl(fd, VIDIOC_QBUF, &buf);
+ ASSERT(r == 0);
+ }
+}
+
+static uint32_t v4l2_dequeue(int fd, uint32_t buf_type)
+{
+ v4l2_buffer buf { };
+ buf.type = buf_type;
+ buf.memory = V4L2_MEMORY_DMABUF;
+
+ // V4L2 crashes if planes are not set
+ v4l2_plane planes[4] { };
+ buf.m.planes = planes;
+ buf.length = 4;
+
+ int r = ioctl(fd, VIDIOC_DQBUF, &buf);
+ if (r)
+ throw system_error(errno, generic_category());
+
+ return buf.index;
+}
+
+
+
+
+VideoDevice::VideoDevice(const string& dev)
+ :VideoDevice(::open(dev.c_str(), O_RDWR | O_NONBLOCK))
+{
+}
+
+VideoDevice::VideoDevice(int fd)
+ : m_fd(fd), m_has_capture(false), m_has_output(false), m_has_m2m(false), m_capture_streamer(0), m_output_streamer(0)
+{
+ FAIL_IF(fd < 0, "Bad fd");
+
+ struct v4l2_capability cap = { };
+ int r = ioctl(fd, VIDIOC_QUERYCAP, &cap);
+ ASSERT(r == 0);
+
+ if (cap.capabilities & V4L2_CAP_VIDEO_CAPTURE_MPLANE) {
+ m_has_capture = true;
+ m_has_mplane_capture = true;
+ } else if (cap.capabilities & V4L2_CAP_VIDEO_CAPTURE) {
+ m_has_capture = true;
+ m_has_mplane_capture = false;
+ }
+
+ if (cap.capabilities & V4L2_CAP_VIDEO_OUTPUT_MPLANE) {
+ m_has_output = true;
+ m_has_mplane_output = true;
+ } else if (cap.capabilities & V4L2_CAP_VIDEO_OUTPUT) {
+ m_has_output = true;
+ m_has_mplane_output = false;
+ }
+
+ if (cap.capabilities & V4L2_CAP_VIDEO_M2M_MPLANE) {
+ m_has_m2m = true;
+ m_has_capture = true;
+ m_has_output = true;
+ m_has_mplane_m2m = true;
+ m_has_mplane_capture = true;
+ m_has_mplane_output = true;
+ } else if (cap.capabilities & V4L2_CAP_VIDEO_M2M) {
+ m_has_m2m = true;
+ m_has_capture = true;
+ m_has_output = true;
+ m_has_mplane_m2m = false;
+ m_has_mplane_capture = false;
+ m_has_mplane_output = false;
+ }
+}
+
+VideoDevice::~VideoDevice()
+{
+ ::close(m_fd);
+}
+
+VideoStreamer* VideoDevice::get_capture_streamer()
+{
+ ASSERT(m_has_capture);
+
+ if (!m_capture_streamer) {
+ auto type = m_has_mplane_capture ? VideoStreamer::StreamerType::CaptureMulti : VideoStreamer::StreamerType::CaptureSingle;
+ m_capture_streamer = new VideoStreamer(m_fd, type);
+ }
+
+ return m_capture_streamer;
+}
+
+VideoStreamer* VideoDevice::get_output_streamer()
+{
+ ASSERT(m_has_output);
+
+ if (!m_output_streamer) {
+ auto type = m_has_mplane_output ? VideoStreamer::StreamerType::OutputMulti : VideoStreamer::StreamerType::OutputSingle;
+ m_output_streamer = new VideoStreamer(m_fd, type);
+ }
+
+ return m_output_streamer;
+}
+
+vector<tuple<uint32_t, uint32_t>> VideoDevice::get_discrete_frame_sizes(PixelFormat fmt)
+{
+ vector<tuple<uint32_t, uint32_t>> v;
+
+ v4l2_frmsizeenum v4lfrms { };
+ v4lfrms.pixel_format = (uint32_t)fmt;
+
+ int r = ioctl(m_fd, VIDIOC_ENUM_FRAMESIZES, &v4lfrms);
+ ASSERT(r);
+
+ FAIL_IF(v4lfrms.type != V4L2_FRMSIZE_TYPE_DISCRETE, "No discrete frame sizes");
+
+ while (ioctl(m_fd, VIDIOC_ENUM_FRAMESIZES, &v4lfrms) == 0) {
+ v.emplace_back(v4lfrms.discrete.width, v4lfrms.discrete.height);
+ v4lfrms.index++;
+ };
+
+ return v;
+}
+
+VideoDevice::VideoFrameSize VideoDevice::get_frame_sizes(PixelFormat fmt)
+{
+ v4l2_frmsizeenum v4lfrms { };
+ v4lfrms.pixel_format = (uint32_t)fmt;
+
+ int r = ioctl(m_fd, VIDIOC_ENUM_FRAMESIZES, &v4lfrms);
+ ASSERT(r);
+
+ FAIL_IF(v4lfrms.type == V4L2_FRMSIZE_TYPE_DISCRETE, "No continuous frame sizes");
+
+ VideoFrameSize s;
+
+ s.min_w = v4lfrms.stepwise.min_width;
+ s.max_w = v4lfrms.stepwise.max_width;
+ s.step_w = v4lfrms.stepwise.step_width;
+
+ s.min_h = v4lfrms.stepwise.min_height;
+ s.max_h = v4lfrms.stepwise.max_height;
+ s.step_h = v4lfrms.stepwise.step_height;
+
+ return s;
+}
+
+vector<string> VideoDevice::get_capture_devices()
+{
+ vector<string> v;
+
+ for (int i = 0; i < 20; ++i) {
+ string name = "/dev/video" + to_string(i);
+
+ struct stat buffer;
+ if (stat(name.c_str(), &buffer) != 0)
+ continue;
+
+ VideoDevice vid(name);
+
+ if (vid.has_capture() && !vid.has_m2m())
+ v.push_back(name);
+ }
+
+ return v;
+}
+
+vector<string> VideoDevice::get_m2m_devices()
+{
+ vector<string> v;
+
+ for (int i = 0; i < 20; ++i) {
+ string name = "/dev/video" + to_string(i);
+
+ struct stat buffer;
+ if (stat(name.c_str(), &buffer) != 0)
+ continue;
+
+ VideoDevice vid(name);
+
+ if (vid.has_m2m())
+ v.push_back(name);
+ }
+
+ return v;
+}
+
+
+VideoStreamer::VideoStreamer(int fd, StreamerType type)
+ : m_fd(fd), m_type(type)
+{
+
+}
+
+std::vector<string> VideoStreamer::get_ports()
+{
+ vector<string> v;
+
+ switch (m_type) {
+ case StreamerType::CaptureSingle:
+ case StreamerType::CaptureMulti:
+ {
+ struct v4l2_input input { };
+
+ while (ioctl(m_fd, VIDIOC_ENUMINPUT, &input) == 0) {
+ v.push_back(string((char*)&input.name));
+ input.index++;
+ }
+
+ break;
+ }
+
+ case StreamerType::OutputSingle:
+ case StreamerType::OutputMulti:
+ {
+ struct v4l2_output output { };
+
+ while (ioctl(m_fd, VIDIOC_ENUMOUTPUT, &output) == 0) {
+ v.push_back(string((char*)&output.name));
+ output.index++;
+ }
+
+ break;
+ }
+
+ default:
+ FAIL("Bad StreamerType");
+ }
+
+ return v;
+}
+
+void VideoStreamer::set_port(uint32_t index)
+{
+ unsigned long req;
+
+ switch (m_type) {
+ case StreamerType::CaptureSingle:
+ case StreamerType::CaptureMulti:
+ req = VIDIOC_S_INPUT;
+ break;
+
+ case StreamerType::OutputSingle:
+ case StreamerType::OutputMulti:
+ req = VIDIOC_S_OUTPUT;
+ break;
+
+ default:
+ FAIL("Bad StreamerType");
+ }
+
+ int r = ioctl(m_fd, req, &index);
+ ASSERT(r == 0);
+}
+
+static v4l2_buf_type get_buf_type(VideoStreamer::StreamerType type)
+{
+ switch (type) {
+ case VideoStreamer::StreamerType::CaptureSingle:
+ return V4L2_BUF_TYPE_VIDEO_CAPTURE;
+ case VideoStreamer::StreamerType::CaptureMulti:
+ return V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
+ case VideoStreamer::StreamerType::OutputSingle:
+ return V4L2_BUF_TYPE_VIDEO_OUTPUT;
+ case VideoStreamer::StreamerType::OutputMulti:
+ return V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
+ default:
+ FAIL("Bad StreamerType");
+ }
+}
+
+std::vector<PixelFormat> VideoStreamer::get_formats()
+{
+ return v4l2_get_formats(m_fd, get_buf_type(m_type));
+}
+
+void VideoStreamer::set_format(PixelFormat fmt, uint32_t width, uint32_t height)
+{
+ v4l2_set_format(m_fd, fmt, width, height, get_buf_type(m_type));
+}
+
+void VideoStreamer::set_queue_size(uint32_t queue_size)
+{
+ v4l2_request_bufs(m_fd, queue_size, get_buf_type(m_type));
+ m_fbs.resize(queue_size);
+}
+
+void VideoStreamer::queue(DumbFramebuffer* fb)
+{
+ uint32_t idx;
+
+ for (idx = 0; idx < m_fbs.size(); ++idx) {
+ if (m_fbs[idx] == nullptr)
+ break;
+ }
+
+ FAIL_IF(idx == m_fbs.size(), "queue full");
+
+ m_fbs[idx] = fb;
+
+ v4l2_queue_dmabuf(m_fd, idx, fb, get_buf_type(m_type));
+}
+
+DumbFramebuffer*VideoStreamer::dequeue()
+{
+ uint32_t idx = v4l2_dequeue(m_fd, get_buf_type(m_type));
+
+ auto fb = m_fbs[idx];
+ m_fbs[idx] = nullptr;
+
+ return fb;
+}
+
+void VideoStreamer::stream_on()
+{
+ uint32_t buf_type = get_buf_type(m_type);
+ int r = ioctl(m_fd, VIDIOC_STREAMON, &buf_type);
+ FAIL_IF(r, "Failed to enable stream: %d", r);
+}
+
+void VideoStreamer::stream_off()
+{
+ uint32_t buf_type = get_buf_type(m_type);
+ int r = ioctl(m_fd, VIDIOC_STREAMOFF, &buf_type);
+ FAIL_IF(r, "Failed to disable stream: %d", r);
+}