gstreamer/tests/examples/d3d11videosink/d3d11videosink-shared-texture.cpp

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/*
* GStreamer
* Copyright (C) 2020 Seungha Yang <seungha@centricular.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
#include <gst/video/video.h>
#include "d3d11device.h"
#include <wrl.h>
#include <mutex>
using namespace Microsoft::WRL;
static gboolean use_keyed_mutex = FALSE;
static gboolean use_nt_handle = FALSE;
static gchar *texture_foramt = nullptr;
static gchar *uri = nullptr;
static GMainLoop *loop = nullptr;
static gboolean visible = FALSE;
static HWND hwnd = nullptr;
std::mutex lock;
/* Device handles */
ComPtr<ID3D11Device> device;
ComPtr<ID3D11DeviceContext> context;
ComPtr<IDXGIFactory2> factory;
/* SwapChain resources */
ComPtr<IDXGISwapChain1> swapchain;
ComPtr<ID3D11RenderTargetView> rtv;
/* Shard texture resources */
ComPtr<ID3D11Texture2D> shared_texture;
ComPtr<ID3D11ShaderResourceView> srv;
ComPtr<IDXGIKeyedMutex> keyed_mutex;
HANDLE shared_handle = nullptr;
UINT misc_flags = 0;
static void
on_begin_draw (GstElement * videosink, gpointer user_data)
{
std::lock_guard<std::mutex> lk (lock);
GstElement *sink = GST_ELEMENT (user_data);
gboolean ret = TRUE;
HRESULT hr;
/* Windows was destroyed, nothing to draw */
if (!hwnd)
return;
if (!shared_handle) {
gst_printerrln ("Shared handle wasn't configured");
exit (-1);
}
g_signal_emit_by_name (sink,
"draw", shared_handle, misc_flags, 0, 0, &ret);
if (!ret) {
gst_printerrln ("Failed to draw on shared handle");
if (loop)
g_main_loop_quit (loop);
return;
}
/* Acquire sync */
if (keyed_mutex) {
hr = keyed_mutex->AcquireSync (0, INFINITE);
if (FAILED (hr)) {
gst_printerrln ("Failed to acquire sync");
exit (-1);
}
}
ID3D11RenderTargetView *render_target_view = rtv.Get();
context->OMSetRenderTargets (1, &render_target_view, nullptr);
ID3D11ShaderResourceView *shader_resource = srv.Get();
context->PSSetShaderResources (0, 1, &shader_resource);
context->DrawIndexed (6, 0, 0);
if (keyed_mutex)
keyed_mutex->ReleaseSync (0);
swapchain->Present (0, 0);
}
static void
on_resize (void)
{
std::lock_guard<std::mutex> lk (lock);
ComPtr<ID3D11Texture2D> backbuffer;
rtv = nullptr;
HRESULT hr = swapchain->ResizeBuffers (0,
/* Specify zero width/height to use the size of current client area */
0, 0,
/* Reuse configured format */
DXGI_FORMAT_UNKNOWN,
0);
if (FAILED (hr)) {
gst_printerrln ("Couldn't resize swapchain");
exit(-1);
}
hr = swapchain->GetBuffer (0, IID_PPV_ARGS (&backbuffer));
if (FAILED (hr)) {
gst_printerrln ("Couldn't get backbuffer from swapchain");
exit(-1);
}
hr = device->CreateRenderTargetView (backbuffer.Get(), nullptr, &rtv);
if (FAILED (hr)) {
gst_printerrln ("Couldn't get ID3D11RenderTargetView from backbuffer");
exit(-1);
}
D3D11_TEXTURE2D_DESC desc;
backbuffer->GetDesc(&desc);
D3D11_VIEWPORT viewport;
viewport.TopLeftX = 0;
viewport.TopLeftY = 0;
viewport.Width = desc.Width;
viewport.Height = desc.Height;
viewport.MinDepth = 0.0f;
viewport.MaxDepth = 1.0f;
context->RSSetViewports (1, &viewport);
}
static LRESULT CALLBACK
window_proc (HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message) {
case WM_DESTROY:
{
std::lock_guard<std::mutex> lk (lock);
hwnd = NULL;
if (loop)
g_main_loop_quit (loop);
break;
}
case WM_SIZE:
on_resize ();
break;
default:
break;
}
return DefWindowProc (hWnd, message, wParam, lParam);
}
static gboolean
bus_msg (GstBus * bus, GstMessage * msg, GstElement * pipeline)
{
switch (GST_MESSAGE_TYPE (msg)) {
case GST_MESSAGE_ASYNC_DONE:
/* make window visible when we have something to show */
if (!visible && hwnd) {
ShowWindow (hwnd, SW_SHOW);
visible = TRUE;
}
gst_element_set_state (pipeline, GST_STATE_PLAYING);
break;
case GST_MESSAGE_ERROR:{
GError *err;
gchar *dbg;
gst_message_parse_error (msg, &err, &dbg);
g_printerr ("ERROR %s \n", err->message);
if (dbg != NULL)
g_printerr ("ERROR debug information: %s\n", dbg);
g_clear_error (&err);
g_free (dbg);
g_main_loop_quit (loop);
break;
}
default:
break;
}
return TRUE;
}
static gboolean
msg_cb (GIOChannel * source, GIOCondition condition, gpointer data)
{
MSG msg;
if (!PeekMessage (&msg, NULL, 0, 0, PM_REMOVE))
return G_SOURCE_CONTINUE;
TranslateMessage (&msg);
DispatchMessage (&msg);
return G_SOURCE_CONTINUE;
}
gint
main (gint argc, gchar ** argv)
{
GstElement *pipeline, *sink;
GstStateChangeReturn sret;
WNDCLASSEX wc = { 0, };
HINSTANCE hinstance = GetModuleHandle (NULL);
GIOChannel *msg_io_channel = NULL;
RECT wr = { 0, 0, 320, 240 };
ComPtr<ID3D11SamplerState> sampler;
ComPtr<ID3D11PixelShader> ps;
ComPtr<ID3D11VertexShader> vs;
ComPtr<ID3D11InputLayout> layout;
ComPtr<ID3D11Buffer> vertex;
ComPtr<ID3D11Buffer> index;
HRESULT hr;
GOptionEntry options[] = {
{"use-keyed-mutex", 0, 0, G_OPTION_ARG_NONE, &use_keyed_mutex,
"Allocate shared texture with D3D11_RESOURCE_MISC_SHARED_KEYEDMUTEX flag",
NULL},
{"use-nt-handle", 0, 0, G_OPTION_ARG_NONE, &use_nt_handle,
"Allocate shared texture with D3D11_RESOURCE_MISC_SHARED_NTHANDLE flag",
NULL},
{"texture-format", 0, 0, G_OPTION_ARG_STRING, &texture_foramt,
"texture format to test, supported arguments are { BGRA, RGBA, RGB10A2_LE }",
NULL},
{"uri", 0, 0, G_OPTION_ARG_STRING, &uri,
"URI to test (if unspecified, videotestsrc will be used)",
NULL},
{NULL}
};
GOptionContext *option_ctx;
gboolean ret;
GError *error = nullptr;
DXGI_FORMAT format = DXGI_FORMAT_B8G8R8A8_UNORM;
option_ctx = g_option_context_new ("d3d11videosink shard-texture example");
g_option_context_add_main_entries (option_ctx, options, NULL);
g_option_context_add_group (option_ctx, gst_init_get_option_group ());
ret = g_option_context_parse (option_ctx, &argc, &argv, &error);
g_option_context_free (option_ctx);
if (!ret) {
g_printerr ("option parsing failed: %s\n", error->message);
g_clear_error (&error);
exit (1);
}
if (g_strcmp0 (texture_foramt, "RGBA") == 0) {
gst_println ("Use DXGI_FORMAT_R8G8B8A8_UNORM (RGBA) format");
format = DXGI_FORMAT_R8G8B8A8_UNORM;
} else if (g_strcmp0 (texture_foramt, "RGB10A2_LE") == 0) {
gst_println ("Use DXGI_FORMAT_R10G10B10A2_UNORM (RGB10A2_LE) format");
format = DXGI_FORMAT_R10G10B10A2_UNORM;
} else {
gst_println ("Use DXGI_FORMAT_B8G8R8A8_UNORM format");
format = DXGI_FORMAT_B8G8R8A8_UNORM;
}
/* NT handle needs to be used with keyed mutex */
if (use_nt_handle) {
misc_flags = D3D11_RESOURCE_MISC_SHARED_KEYEDMUTEX | D3D11_RESOURCE_MISC_SHARED_NTHANDLE;
} else if (use_keyed_mutex) {
misc_flags = D3D11_RESOURCE_MISC_SHARED_KEYEDMUTEX;
} else {
misc_flags = D3D11_RESOURCE_MISC_SHARED;
}
gst_println ("Use keyed-mutex: %d, use_nt_handle: %d", use_keyed_mutex,
use_nt_handle);
/* 1) Prepare window */
wc.cbSize = sizeof (WNDCLASSEX);
wc.style = CS_HREDRAW | CS_VREDRAW;
wc.lpfnWndProc = (WNDPROC) window_proc;
wc.hInstance = hinstance;
wc.hCursor = LoadCursor (NULL, IDC_ARROW);
wc.lpszClassName = TEXT ("GstD3D11VideoSinkSharedTextureExExample");
RegisterClassEx (&wc);
AdjustWindowRect (&wr, WS_OVERLAPPEDWINDOW, FALSE);
hwnd = CreateWindowEx (0, wc.lpszClassName,
TEXT ("GstD3D11VideoSinkSharedTextureExExample"),
WS_CLIPSIBLINGS | WS_CLIPCHILDREN | WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT,
wr.right - wr.left, wr.bottom - wr.top, (HWND) NULL, (HMENU) NULL,
hinstance, NULL);
/* 2) Prepare D3D11 device */
hr = prepare_d3d11_device (&device, &context, &factory);
if (FAILED (hr)) {
gst_printerrln ("D3D11 device is unavailable");
return -1;
}
hr = prepare_shader (device.Get(), context.Get(), &sampler,
&ps, &vs, &layout, &vertex, &index);
if (FAILED (hr)) {
gst_printerrln ("Couldn't setup shader");
return -1;
}
/* 3) Prepare SwapChain */
DXGI_SWAP_CHAIN_DESC1 desc = { 0, };
desc.Width = 0;
desc.Height = 0;
desc.Format = format;
desc.Stereo = FALSE;
desc.SampleDesc.Count = 1;
desc.SampleDesc.Quality = 0;
desc.BufferUsage = DXGI_USAGE_RENDER_TARGET_OUTPUT;
desc.BufferCount = 2;
desc.Scaling = DXGI_SCALING_NONE;
desc.SwapEffect = DXGI_SWAP_EFFECT_FLIP_SEQUENTIAL;
desc.AlphaMode = DXGI_ALPHA_MODE_UNSPECIFIED;
hr = factory->CreateSwapChainForHwnd (device.Get(), hwnd, &desc,
nullptr, nullptr, &swapchain);
if (FAILED (hr)) {
gst_printerrln ("IDXGISwapChain1 is unavailable");
return -1;
}
/* 4) Create shared texture */
/* Texture size doesn't need to be identical to that of backbuffer */
hr = prepare_shared_texture (device.Get(), 1280, 720,
format, misc_flags, &shared_texture, &srv, &keyed_mutex, &shared_handle);
if (FAILED (hr)) {
gst_printerrln ("Couldn't create texture to share with d3d11videosink");
return -1;
}
context->IASetPrimitiveTopology (D3D11_PRIMITIVE_TOPOLOGY_TRIANGLELIST);
context->IASetInputLayout (layout.Get());
ID3D11Buffer *buf = vertex.Get();
UINT offsets = 0;
UINT stride = sizeof(VertexData);
context->IASetVertexBuffers (0, 1, &buf, &stride, &offsets);
context->IASetIndexBuffer (index.Get(), DXGI_FORMAT_R16_UINT, 0);
ID3D11SamplerState *sampler_state = sampler.Get();
context->PSSetSamplers (0, 1, &sampler_state);
context->VSSetShader (vs.Get(), nullptr, 0);
context->PSSetShader (ps.Get(), nullptr, 0);
/* Call initial resize to prepare resources */
on_resize();
loop = g_main_loop_new (NULL, FALSE);
msg_io_channel = g_io_channel_win32_new_messages ((gsize) hwnd);
g_io_add_watch (msg_io_channel, G_IO_IN, msg_cb, NULL);
/* Enable drawing on our texture and add signal handler */
sink = gst_element_factory_make ("d3d11videosink", NULL);
g_object_set (sink, "draw-on-shared-texture", TRUE, nullptr);
g_signal_connect (sink, "begin-draw", G_CALLBACK (on_begin_draw), sink);
if (uri) {
pipeline = gst_element_factory_make ("playbin", nullptr);
g_object_set (pipeline, "uri", uri, "video-sink", sink, nullptr);
} else {
GstElement *src = gst_element_factory_make ("videotestsrc", nullptr);
pipeline = gst_pipeline_new ("d3d11videosink-pipeline");
gst_bin_add_many (GST_BIN (pipeline), src, sink, NULL);
gst_element_link (src, sink);
}
gst_bus_add_watch (GST_ELEMENT_BUS (pipeline), (GstBusFunc) bus_msg,
pipeline);
sret = gst_element_set_state (pipeline, GST_STATE_PAUSED);
if (sret == GST_STATE_CHANGE_FAILURE) {
g_printerr ("Pipeline doesn't want to pause\n");
} else {
g_main_loop_run (loop);
gst_element_set_state (pipeline, GST_STATE_NULL);
}
gst_bus_remove_watch (GST_ELEMENT_BUS (pipeline));
if (hwnd)
DestroyWindow (hwnd);
gst_object_unref (pipeline);
if (msg_io_channel)
g_io_channel_unref (msg_io_channel);
g_main_loop_unref (loop);
gst_deinit ();
g_free (texture_foramt);
g_free (uri);
/* NT handle should be explicitly closed to avoid leak */
if (use_nt_handle)
CloseHandle (shared_handle);
return 0;
}