gstreamer/subprojects/gst-plugins-bad/tests/examples/d3d11/d3d11overlay.cpp

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/*
* GStreamer
* Copyright (C) 2023 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 <gst/d3d11/gstd3d11.h>
#include <d2d1.h>
#include <dwrite.h>
#include <wrl.h>
#include <string>
#include <locale>
#include <codecvt>
/* *INDENT-OFF* */
using namespace Microsoft::WRL;
struct OverlayContext
{
GstElement *pipeline = nullptr;
ID2D1Factory *d2d_factory = nullptr;
IDWriteFactory *dwrite_factory = nullptr;
IDWriteTextFormat *format = nullptr;
IDWriteTextLayout *layout = nullptr;
std::wstring text;
FLOAT width;
FLOAT height;
FLOAT origin_y;
gint text_width;
gint last_position = 0;
GMainLoop *loop = nullptr;
};
/* *INDENT-ON* */
static gboolean
bus_msg (GstBus * bus, GstMessage * msg, OverlayContext * context)
{
switch (GST_MESSAGE_TYPE (msg)) {
case GST_MESSAGE_ERROR:{
GError *err;
gchar *dbg;
gst_message_parse_error (msg, &err, &dbg);
gst_printerrln ("ERROR %s", err->message);
if (dbg)
gst_printerrln ("ERROR debug information: %s", dbg);
g_clear_error (&err);
g_free (dbg);
g_main_loop_quit (context->loop);
break;
}
case GST_MESSAGE_EOS:
gst_println ("Got EOS");
g_main_loop_quit (context->loop);
break;
default:
break;
}
return TRUE;
}
/* This callback will be called with gst_d3d11_device_lock() taken by
* d3d11overlay. We can perform GPU operation here safely */
static gboolean
on_draw (GstElement * overlay, GstD3D11Device * device,
ID3D11RenderTargetView * rtv, GstClockTime pts, GstClockTime duration,
OverlayContext * context)
{
ComPtr < ID3D11Resource > resource;
ComPtr < IDXGISurface > surface;
ComPtr < ID2D1RenderTarget > d2d_target;
ComPtr < ID2D1SolidColorBrush > text_brush;
ComPtr < ID2D1SolidColorBrush > bg_brush;
HRESULT hr;
ID2D1Factory *d2d_factory;
FLOAT position;
rtv->GetResource (&resource);
hr = resource.As (&surface);
g_assert (SUCCEEDED (hr));
d2d_factory = context->d2d_factory;
D2D1_RENDER_TARGET_PROPERTIES props;
props.type = D2D1_RENDER_TARGET_TYPE_DEFAULT;
props.pixelFormat.format = DXGI_FORMAT_B8G8R8A8_UNORM;
props.pixelFormat.alphaMode = D2D1_ALPHA_MODE_PREMULTIPLIED;
/* default DPI */
props.dpiX = 0;
props.dpiY = 0;
props.usage = D2D1_RENDER_TARGET_USAGE_NONE;
props.minLevel = D2D1_FEATURE_LEVEL_DEFAULT;
/* Creates D2D render target using swapchin's backbuffer */
hr = d2d_factory->CreateDxgiSurfaceRenderTarget (surface.Get (), props,
&d2d_target);
g_assert (SUCCEEDED (hr));
hr = d2d_target->CreateSolidColorBrush (D2D1::ColorF (D2D1::ColorF::Black),
&bg_brush);
g_assert (SUCCEEDED (hr));
hr = d2d_target->CreateSolidColorBrush (D2D1::ColorF (D2D1::ColorF::White),
&text_brush);
g_assert (SUCCEEDED (hr));
d2d_target->BeginDraw ();
/* Draw background */
d2d_target->FillRectangle (D2D1::RectF (0, context->origin_y, context->width,
context->height), bg_brush.Get ());
/* Draw text */
position = -context->last_position;
do {
d2d_target->DrawTextLayout (D2D1::Point2F (position, context->origin_y),
context->layout, text_brush.Get (),
D2D1_DRAW_TEXT_OPTIONS_CLIP | D2D1_DRAW_TEXT_OPTIONS_ENABLE_COLOR_FONT);
position = position + context->text_width;
} while (position < context->width);
d2d_target->EndDraw ();
context->last_position += 2;
if (context->last_position >= context->text_width) {
context->last_position %= context->text_width;
}
return TRUE;
}
gint
main (gint argc, gchar ** argv)
{
GOptionContext *option_ctx;
GError *error = nullptr;
gboolean ret;
gchar *text = nullptr;
gint width = 1280;
gint height = 720;
GOptionEntry options[] = {
{"text", 0, 0, G_OPTION_ARG_STRING, &text, "Text to render", nullptr},
{"width", 0, 0, G_OPTION_ARG_INT, &width, "Width of video stream", nullptr},
{"height", 0, 0, G_OPTION_ARG_INT, &height, "Height of video stream",
nullptr},
{nullptr}
};
OverlayContext context;
GstStateChangeReturn sret;
HRESULT hr;
std::wstring text_wide;
std::string pipeline_str;
GstElement *overlay;
DWRITE_TEXT_METRICS metrics;
FLOAT font_size;
bool was_decreased = false;
DWRITE_TEXT_RANGE range;
FLOAT text_height;
gchar **win32_argv;
ComPtr < IDWriteTextFormat > text_format;
ComPtr < IDWriteTextLayout > text_layout;
win32_argv = g_win32_get_command_line ();
option_ctx = g_option_context_new ("d3d11overlay example");
g_option_context_add_main_entries (option_ctx, options, nullptr);
g_option_context_add_group (option_ctx, gst_init_get_option_group ());
ret = g_option_context_parse_strv (option_ctx, &win32_argv, &error);
g_option_context_free (option_ctx);
g_strfreev (win32_argv);
if (!ret) {
gst_printerrln ("option parsing failed: %s", error->message);
g_clear_error (&error);
return 1;
}
/* Prepare device independent D2D objects */
hr = D2D1CreateFactory (D2D1_FACTORY_TYPE_MULTI_THREADED,
IID_PPV_ARGS (&context.d2d_factory));
if (FAILED (hr)) {
gst_printerrln ("Couldn't create D2D factory");
return 1;
}
hr = DWriteCreateFactory (DWRITE_FACTORY_TYPE_SHARED,
__uuidof (context.dwrite_factory),
reinterpret_cast < IUnknown ** >(&context.dwrite_factory));
if (FAILED (hr)) {
gst_printerrln ("Couldn't create DirectWrite factory");
return 1;
}
hr = context.dwrite_factory->CreateTextFormat (L"Arial", nullptr,
DWRITE_FONT_WEIGHT_BOLD, DWRITE_FONT_STYLE_NORMAL,
DWRITE_FONT_STRETCH_NORMAL, 12.0f, L"en-us", &text_format);
if (FAILED (hr)) {
gst_printerrln ("Couldn't create IDWriteTextFormat");
return 1;
}
text_format->SetTextAlignment (DWRITE_TEXT_ALIGNMENT_LEADING);
text_format->SetParagraphAlignment (DWRITE_PARAGRAPH_ALIGNMENT_CENTER);
text_format->SetWordWrapping (DWRITE_WORD_WRAPPING_NO_WRAP);
if (text && text[0] != '\0') {
std::wstring_convert < std::codecvt_utf8_utf16 < wchar_t >>converter;
text_wide = converter.from_bytes (text);
} else {
/* *INDENT-OFF* */
text_wide =
std::wstring (L"Hello GStreamer! 😊 안녕하세요 GStreamer! 😉 ") +
std::wstring (L"नमस्ते GStreamer! ❤️ Bonjour GStreamer! 😁 ") +
std::wstring (L"Hallo GStreamer! 😎 Hola GStreamer! 😍 ") +
std::wstring (L"こんにちは GStreamer! ✌️ 你好 GStreamer! 👍");
/* *INDENT-ON* */
}
text_height = (FLOAT) height / 10.0f;
hr = context.dwrite_factory->CreateTextLayout (text_wide.c_str (),
text_wide.length (), text_format.Get (), G_MAXFLOAT, G_MAXFLOAT,
&text_layout);
if (FAILED (hr)) {
gst_printerrln ("Couldn't create IDWriteTextLayout");
return 1;
}
/* Calculate best font size */
range.startPosition = 0;
range.length = text_wide.length ();
do {
hr = text_layout->GetMetrics (&metrics);
g_assert (SUCCEEDED (hr));
text_layout->GetFontSize (0, &font_size);
if (metrics.height >= (FLOAT) text_height) {
if (font_size > 1.0f) {
font_size -= 0.5f;
was_decreased = true;
hr = text_layout->SetFontSize (font_size, range);
g_assert (SUCCEEDED (hr));
continue;
}
break;
}
if (was_decreased)
break;
if (metrics.height < text_height) {
if (metrics.height >= text_height * 0.9)
break;
font_size += 0.5f;
hr = text_layout->SetFontSize (font_size, range);
g_assert (SUCCEEDED (hr));
continue;
}
} while (true);
gst_println ("Calculated font size %lf", font_size);
/* 10 pixels padding per loop */
text_layout->SetMaxWidth (metrics.widthIncludingTrailingWhitespace + 10);
text_layout->SetMaxHeight (metrics.height);
context.text = text_wide;
context.origin_y = (FLOAT) height - text_height;
context.width = width;
context.height = height;
context.text_width = metrics.widthIncludingTrailingWhitespace + 10;
context.layout = text_layout.Detach ();
context.loop = g_main_loop_new (nullptr, FALSE);
pipeline_str =
"d3d11testsrc ! video/x-raw(memory:D3D11Memory),format=BGRA,width=" +
std::to_string (width) + ",height=" + std::to_string (height) +
",framerate=60/1 ! d3d11overlay name=overlay ! queue ! d3d11videosink";
context.pipeline = gst_parse_launch (pipeline_str.c_str (), nullptr);
g_assert (context.pipeline);
overlay = gst_bin_get_by_name (GST_BIN (context.pipeline), "overlay");
g_assert (overlay);
g_signal_connect (overlay, "draw", G_CALLBACK (on_draw), &context);
gst_object_unref (overlay);
gst_bus_add_watch (GST_ELEMENT_BUS (context.pipeline),
(GstBusFunc) bus_msg, &context);
sret = gst_element_set_state (context.pipeline, GST_STATE_PLAYING);
g_assert (sret != GST_STATE_CHANGE_FAILURE);
g_main_loop_run (context.loop);
gst_element_set_state (context.pipeline, GST_STATE_NULL);
gst_bus_remove_watch (GST_ELEMENT_BUS (context.pipeline));
gst_object_unref (context.pipeline);
context.format->Release ();
context.layout->Release ();
context.d2d_factory->Release ();
context.dwrite_factory->Release ();
g_main_loop_unref (context.loop);
g_free (text);
return 0;
}