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FFmpeg/libavfilter/vsrc_ddagrab.c
Timo Rothenpieler f611255480 avfilter: add vsrc_ddagrab
2022-07-18 02:08:27 +02:00

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/*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "config.h"
#if !defined(_WIN32_WINNT) || _WIN32_WINNT < 0x0A00
#undef _WIN32_WINNT
#define _WIN32_WINNT 0x0A00
#endif
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#define COBJMACROS
#include <initguid.h>
#include <d3d11.h>
#include <dxgi1_2.h>
#if HAVE_IDXGIOUTPUT5
#include <dxgi1_5.h>
#endif
#include "libavutil/opt.h"
#include "libavutil/time.h"
#include "libavutil/avstring.h"
#include "libavutil/avassert.h"
#include "libavutil/hwcontext.h"
#include "libavutil/hwcontext_d3d11va.h"
#include "avfilter.h"
#include "internal.h"
#include "formats.h"
#include "video.h"
#include "vsrc_ddagrab_shaders.h"
// avutil/time.h takes and returns time in microseconds
#define TIMER_RES 1000000
#define TIMER_RES64 INT64_C(1000000)
typedef struct DdagrabContext {
const AVClass *class;
AVBufferRef *device_ref;
AVHWDeviceContext *device_ctx;
AVD3D11VADeviceContext *device_hwctx;
AVBufferRef *frames_ref;
AVHWFramesContext *frames_ctx;
AVD3D11VAFramesContext *frames_hwctx;
DXGI_OUTPUT_DESC output_desc;
IDXGIOutputDuplication *dxgi_outdupl;
AVFrame *last_frame;
int mouse_x, mouse_y;
ID3D11Texture2D *mouse_texture;
ID3D11ShaderResourceView* mouse_resource_view ;
AVRational time_base;
int64_t time_frame;
int64_t time_timeout;
int64_t first_pts;
DXGI_FORMAT raw_format;
int raw_width;
int raw_height;
ID3D11Texture2D *probed_texture;
ID3D11VertexShader *vertex_shader;
ID3D11InputLayout *input_layout;
ID3D11PixelShader *pixel_shader;
ID3D11Buffer *const_buffer;
ID3D11SamplerState *sampler_state;
ID3D11BlendState *blend_state;
int output_idx;
int draw_mouse;
AVRational framerate;
int width;
int height;
int offset_x;
int offset_y;
} DdagrabContext;
#define OFFSET(x) offsetof(DdagrabContext, x)
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
static const AVOption ddagrab_options[] = {
{ "output_idx", "dda output index to capture", OFFSET(output_idx), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
{ "draw_mouse", "draw the mouse pointer", OFFSET(draw_mouse), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, FLAGS },
{ "framerate", "set video frame rate", OFFSET(framerate), AV_OPT_TYPE_VIDEO_RATE, { .str = "30" }, 0, INT_MAX, FLAGS },
{ "video_size", "set video frame size", OFFSET(width), AV_OPT_TYPE_IMAGE_SIZE, { .str = NULL }, 0, 0, FLAGS },
{ "offset_x", "capture area x offset", OFFSET(offset_x), AV_OPT_TYPE_INT, { .i64 = 0 }, INT_MIN, INT_MAX, FLAGS },
{ "offset_y", "capture area y offset", OFFSET(offset_y), AV_OPT_TYPE_INT, { .i64 = 0 }, INT_MIN, INT_MAX, FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(ddagrab);
static inline void release_resource(void *resource)
{
IUnknown **resp = (IUnknown**)resource;
if (*resp) {
IUnknown_Release(*resp);
*resp = NULL;
}
}
static av_cold void ddagrab_uninit(AVFilterContext *avctx)
{
DdagrabContext *dda = avctx->priv;
release_resource(&dda->blend_state);
release_resource(&dda->sampler_state);
release_resource(&dda->pixel_shader);
release_resource(&dda->input_layout);
release_resource(&dda->vertex_shader);
release_resource(&dda->const_buffer);
release_resource(&dda->probed_texture);
release_resource(&dda->dxgi_outdupl);
release_resource(&dda->mouse_resource_view);
release_resource(&dda->mouse_texture);
av_frame_free(&dda->last_frame);
av_buffer_unref(&dda->frames_ref);
av_buffer_unref(&dda->device_ref);
}
static av_cold int init_dxgi_dda(AVFilterContext *avctx)
{
DdagrabContext *dda = avctx->priv;
IDXGIDevice *dxgi_device = NULL;
IDXGIAdapter *dxgi_adapter = NULL;
IDXGIOutput *dxgi_output = NULL;
IDXGIOutput1 *dxgi_output1 = NULL;
#if HAVE_IDXGIOUTPUT5 && HAVE_SETTHREADDPIAWARENESSCONTEXT
IDXGIOutput5 *dxgi_output5 = NULL;
#endif
int w, h;
HRESULT hr;
hr = ID3D11Device_QueryInterface(dda->device_hwctx->device, &IID_IDXGIDevice, (void**)&dxgi_device);
if (FAILED(hr)) {
av_log(avctx, AV_LOG_ERROR, "Failed querying IDXGIDevice\n");
return AVERROR_EXTERNAL;
}
hr = IDXGIDevice_GetParent(dxgi_device, &IID_IDXGIAdapter, (void**)&dxgi_adapter);
IDXGIDevice_Release(dxgi_device);
dxgi_device = NULL;
if (FAILED(hr)) {
av_log(avctx, AV_LOG_ERROR, "Failed getting parent IDXGIAdapter\n");
return AVERROR_EXTERNAL;
}
hr = IDXGIAdapter_EnumOutputs(dxgi_adapter, dda->output_idx, &dxgi_output);
IDXGIAdapter_Release(dxgi_adapter);
dxgi_adapter = NULL;
if (FAILED(hr)) {
av_log(avctx, AV_LOG_ERROR, "Failed to enumerate DXGI output %d\n", dda->output_idx);
return AVERROR_EXTERNAL;
}
hr = IDXGIOutput_GetDesc(dxgi_output, &dda->output_desc);
if (FAILED(hr)) {
IDXGIOutput_Release(dxgi_output);
av_log(avctx, AV_LOG_ERROR, "Failed getting output description\n");
return AVERROR_EXTERNAL;
}
#if HAVE_IDXGIOUTPUT5 && HAVE_SETTHREADDPIAWARENESSCONTEXT
hr = IDXGIOutput_QueryInterface(dxgi_output, &IID_IDXGIOutput5, (void**)&dxgi_output5);
if (SUCCEEDED(hr)) {
DPI_AWARENESS_CONTEXT prev_dpi_ctx;
DXGI_FORMAT formats[] = {
DXGI_FORMAT_R10G10B10A2_UNORM,
DXGI_FORMAT_B8G8R8A8_UNORM
};
IDXGIOutput_Release(dxgi_output);
dxgi_output = NULL;
prev_dpi_ctx = SetThreadDpiAwarenessContext(DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2);
if (!prev_dpi_ctx)
av_log(avctx, AV_LOG_WARNING, "Failed enabling DPI awareness for DDA\n");
hr = IDXGIOutput5_DuplicateOutput1(dxgi_output5,
(IUnknown*)dda->device_hwctx->device,
0,
FF_ARRAY_ELEMS(formats),
formats,
&dda->dxgi_outdupl);
IDXGIOutput5_Release(dxgi_output5);
dxgi_output5 = NULL;
if (prev_dpi_ctx)
SetThreadDpiAwarenessContext(prev_dpi_ctx);
} else {
av_log(avctx, AV_LOG_DEBUG, "Falling back to IDXGIOutput1\n");
#else
{
#endif
hr = IDXGIOutput_QueryInterface(dxgi_output, &IID_IDXGIOutput1, (void**)&dxgi_output1);
IDXGIOutput_Release(dxgi_output);
dxgi_output = NULL;
if (FAILED(hr)) {
av_log(avctx, AV_LOG_ERROR, "Failed querying IDXGIOutput1\n");
return AVERROR_EXTERNAL;
}
hr = IDXGIOutput1_DuplicateOutput(dxgi_output1,
(IUnknown*)dda->device_hwctx->device,
&dda->dxgi_outdupl);
IDXGIOutput1_Release(dxgi_output1);
dxgi_output1 = NULL;
}
if (hr == DXGI_ERROR_NOT_CURRENTLY_AVAILABLE) {
av_log(avctx, AV_LOG_ERROR, "Too many open duplication sessions\n");
return AVERROR(EBUSY);
} else if (hr == DXGI_ERROR_UNSUPPORTED) {
av_log(avctx, AV_LOG_ERROR, "Selected output not supported\n");
return AVERROR_EXTERNAL;
} else if (hr == E_INVALIDARG) {
av_log(avctx, AV_LOG_ERROR, "Invalid output duplication argument\n");
return AVERROR(EINVAL);
} else if (hr == E_ACCESSDENIED) {
av_log(avctx, AV_LOG_ERROR, "Desktop duplication access denied\n");
return AVERROR(EPERM);
} else if (FAILED(hr)) {
av_log(avctx, AV_LOG_ERROR, "Failed duplicating output\n");
return AVERROR_EXTERNAL;
}
w = dda->output_desc.DesktopCoordinates.right - dda->output_desc.DesktopCoordinates.left;
h = dda->output_desc.DesktopCoordinates.bottom - dda->output_desc.DesktopCoordinates.top;
av_log(avctx, AV_LOG_VERBOSE, "Opened dxgi output %d with dimensions %dx%d\n", dda->output_idx, w, h);
return 0;
}
typedef struct ConstBufferData
{
float width;
float height;
uint64_t padding;
} ConstBufferData;
static const D3D11_INPUT_ELEMENT_DESC vertex_shader_input_layout[] =
{
{ "POSITION", 0, DXGI_FORMAT_R32G32B32_FLOAT, 0, 0, D3D11_INPUT_PER_VERTEX_DATA, 0 },
{ "TEXCOORD", 0, DXGI_FORMAT_R32G32_FLOAT, 0, 12, D3D11_INPUT_PER_VERTEX_DATA, 0 }
};
static av_cold int init_render_resources(AVFilterContext *avctx)
{
DdagrabContext *dda = avctx->priv;
ID3D11Device *dev = dda->device_hwctx->device;
D3D11_SAMPLER_DESC sampler_desc = { 0 };
D3D11_BLEND_DESC blend_desc = { 0 };
D3D11_BUFFER_DESC buffer_desc = { 0 };
D3D11_SUBRESOURCE_DATA buffer_data = { 0 };
ConstBufferData const_data = { 0 };
HRESULT hr;
hr = ID3D11Device_CreateVertexShader(dev,
vertex_shader_bytes,
FF_ARRAY_ELEMS(vertex_shader_bytes),
NULL,
&dda->vertex_shader);
if (FAILED(hr)) {
av_log(avctx, AV_LOG_ERROR, "CreateVertexShader failed: %lx\n", hr);
return AVERROR_EXTERNAL;
}
hr = ID3D11Device_CreateInputLayout(dev,
vertex_shader_input_layout,
FF_ARRAY_ELEMS(vertex_shader_input_layout),
vertex_shader_bytes,
FF_ARRAY_ELEMS(vertex_shader_bytes),
&dda->input_layout);
if (FAILED(hr)) {
av_log(avctx, AV_LOG_ERROR, "CreateInputLayout failed: %lx\n", hr);
return AVERROR_EXTERNAL;
}
hr = ID3D11Device_CreatePixelShader(dev,
pixel_shader_bytes,
FF_ARRAY_ELEMS(pixel_shader_bytes),
NULL,
&dda->pixel_shader);
if (FAILED(hr)) {
av_log(avctx, AV_LOG_ERROR, "CreatePixelShader failed: %lx\n", hr);
return AVERROR_EXTERNAL;
}
const_data = (ConstBufferData){ dda->width, dda->height };
buffer_data.pSysMem = &const_data;
buffer_desc.ByteWidth = sizeof(const_data);
buffer_desc.Usage = D3D11_USAGE_IMMUTABLE;
buffer_desc.BindFlags = D3D11_BIND_CONSTANT_BUFFER;
hr = ID3D11Device_CreateBuffer(dev,
&buffer_desc,
&buffer_data,
&dda->const_buffer);
if (FAILED(hr)) {
av_log(avctx, AV_LOG_ERROR, "CreateBuffer const buffer failed: %lx\n", hr);
return AVERROR_EXTERNAL;
}
sampler_desc.Filter = D3D11_FILTER_MIN_MAG_MIP_LINEAR;
sampler_desc.AddressU = D3D11_TEXTURE_ADDRESS_CLAMP;
sampler_desc.AddressV = D3D11_TEXTURE_ADDRESS_CLAMP;
sampler_desc.AddressW = D3D11_TEXTURE_ADDRESS_CLAMP;
sampler_desc.ComparisonFunc = D3D11_COMPARISON_NEVER;
hr = ID3D11Device_CreateSamplerState(dev,
&sampler_desc,
&dda->sampler_state);
if (FAILED(hr)) {
av_log(avctx, AV_LOG_ERROR, "CreateSamplerState failed: %lx\n", hr);
return AVERROR_EXTERNAL;
}
blend_desc.AlphaToCoverageEnable = FALSE;
blend_desc.IndependentBlendEnable = FALSE;
blend_desc.RenderTarget[0].BlendEnable = TRUE;
blend_desc.RenderTarget[0].SrcBlend = D3D11_BLEND_SRC_ALPHA;
blend_desc.RenderTarget[0].DestBlend = D3D11_BLEND_INV_SRC_ALPHA;
blend_desc.RenderTarget[0].BlendOp = D3D11_BLEND_OP_ADD;
blend_desc.RenderTarget[0].SrcBlendAlpha = D3D11_BLEND_ONE;
blend_desc.RenderTarget[0].DestBlendAlpha = D3D11_BLEND_ZERO;
blend_desc.RenderTarget[0].BlendOpAlpha = D3D11_BLEND_OP_ADD;
blend_desc.RenderTarget[0].RenderTargetWriteMask = D3D11_COLOR_WRITE_ENABLE_ALL;
hr = ID3D11Device_CreateBlendState(dev,
&blend_desc,
&dda->blend_state);
if (FAILED(hr)) {
av_log(avctx, AV_LOG_ERROR, "CreateBlendState failed: %lx\n", hr);
return AVERROR_EXTERNAL;
}
return 0;
}
static av_cold int ddagrab_init(AVFilterContext *avctx)
{
DdagrabContext *dda = avctx->priv;
int ret = 0;
if (avctx->hw_device_ctx) {
dda->device_ctx = (AVHWDeviceContext*)avctx->hw_device_ctx->data;
if (dda->device_ctx->type != AV_HWDEVICE_TYPE_D3D11VA) {
av_log(avctx, AV_LOG_ERROR, "Non-D3D11VA input hw_device_ctx\n");
return AVERROR(EINVAL);
}
dda->device_ref = av_buffer_ref(avctx->hw_device_ctx);
if (!dda->device_ref)
return AVERROR(ENOMEM);
av_log(avctx, AV_LOG_VERBOSE, "Using provided hw_device_ctx\n");
} else {
ret = av_hwdevice_ctx_create(&dda->device_ref, AV_HWDEVICE_TYPE_D3D11VA, NULL, NULL, 0);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "Failed to create D3D11VA device.\n");
return ret;
}
dda->device_ctx = (AVHWDeviceContext*)dda->device_ref->data;
av_log(avctx, AV_LOG_VERBOSE, "Created internal hw_device_ctx\n");
}
dda->device_hwctx = (AVD3D11VADeviceContext*)dda->device_ctx->hwctx;
ret = init_dxgi_dda(avctx);
if (ret < 0)
goto fail;
dda->time_base = av_inv_q(dda->framerate);
dda->time_frame = av_gettime_relative() / av_q2d(dda->time_base);
dda->time_timeout = av_rescale_q(1, dda->time_base, (AVRational) { 1, 1000 }) / 2;
dda->last_frame = av_frame_alloc();
if (!dda->last_frame) {
ret = AVERROR(ENOMEM);
goto fail;
}
dda->mouse_x = -1;
dda->mouse_y = -1;
if (dda->draw_mouse) {
ret = init_render_resources(avctx);
if (ret < 0)
goto fail;
}
return 0;
fail:
ddagrab_uninit(avctx);
return ret;
}
static int create_d3d11_pointer_tex(AVFilterContext *avctx,
uint8_t *buf,
DXGI_OUTDUPL_POINTER_SHAPE_INFO *shape_info,
ID3D11Texture2D **out_tex,
ID3D11ShaderResourceView **res_view)
{
DdagrabContext *dda = avctx->priv;
D3D11_TEXTURE2D_DESC desc = { 0 };
D3D11_SUBRESOURCE_DATA init_data = { 0 };
D3D11_SHADER_RESOURCE_VIEW_DESC resource_desc = { 0 };
HRESULT hr;
desc.MipLevels = 1;
desc.ArraySize = 1;
desc.Format = DXGI_FORMAT_B8G8R8A8_UNORM;
desc.SampleDesc.Count = 1;
desc.SampleDesc.Quality = 0;
desc.Usage = D3D11_USAGE_IMMUTABLE;
desc.BindFlags = D3D11_BIND_SHADER_RESOURCE;
desc.Width = shape_info->Width;
desc.Height = shape_info->Height;
init_data.pSysMem = buf;
init_data.SysMemPitch = shape_info->Pitch;
resource_desc.Format = desc.Format;
resource_desc.ViewDimension = D3D11_SRV_DIMENSION_TEXTURE2D;
resource_desc.Texture2D.MostDetailedMip = 0;
resource_desc.Texture2D.MipLevels = 1;
hr = ID3D11Device_CreateTexture2D(dda->device_hwctx->device,
&desc,
&init_data,
out_tex);
if (FAILED(hr)) {
av_log(avctx, AV_LOG_ERROR, "Failed creating pointer texture\n");
return AVERROR_EXTERNAL;
}
hr = ID3D11Device_CreateShaderResourceView(dda->device_hwctx->device,
(ID3D11Resource*)dda->mouse_texture,
&resource_desc,
res_view);
if (FAILED(hr)) {
release_resource(out_tex);
av_log(avctx, AV_LOG_ERROR, "CreateShaderResourceView for mouse failed: %lx\n", hr);
return AVERROR_EXTERNAL;
}
return 0;
}
static uint8_t *convert_mono_buffer(uint8_t *input, int *_width, int *_height, int *_pitch)
{
int width = *_width, height = *_height, pitch = *_pitch;
int real_height = height / 2;
uint8_t *output = av_malloc(real_height * width * 4);
int y, x;
if (!output)
return NULL;
// This simulates drawing the cursor on a full black surface
// i.e. ignore the AND mask, turn XOR mask into all 4 color channels
for (y = 0; y < real_height; y++) {
for (x = 0; x < width; x++) {
int v = input[(real_height + y) * pitch + (x / 8)];
v = (v >> (7 - (x % 8))) & 1;
memset(&output[4 * ((y*width) + x)], v ? 0xFF : 0, 4);
}
}
*_pitch = width * 4;
*_height = real_height;
return output;
}
static void fixup_color_mask(uint8_t *buf, int width, int height, int pitch)
{
int x, y;
// There is no good way to replicate XOR'ig parts of the texture with the screen
// best effort is rendering the non-masked parts, and make the rest transparent
for (y = 0; y < height; y++) {
for (x = 0; x < width; x++) {
int pos = (y*pitch) + (4*x) + 3;
buf[pos] = buf[pos] ? 0 : 0xFF;
}
}
}
static int update_mouse_pointer(AVFilterContext *avctx, DXGI_OUTDUPL_FRAME_INFO *frame_info)
{
DdagrabContext *dda = avctx->priv;
HRESULT hr;
int ret;
if (frame_info->LastMouseUpdateTime.QuadPart == 0)
return 0;
if (frame_info->PointerPosition.Visible) {
dda->mouse_x = frame_info->PointerPosition.Position.x;
dda->mouse_y = frame_info->PointerPosition.Position.y;
} else {
dda->mouse_x = dda->mouse_y = -1;
}
if (frame_info->PointerShapeBufferSize) {
UINT size = frame_info->PointerShapeBufferSize;
DXGI_OUTDUPL_POINTER_SHAPE_INFO shape_info;
uint8_t *buf = av_malloc(size);
if (!buf)
return AVERROR(ENOMEM);
hr = IDXGIOutputDuplication_GetFramePointerShape(dda->dxgi_outdupl,
size,
buf,
&size,
&shape_info);
if (FAILED(hr)) {
av_free(buf);
av_log(avctx, AV_LOG_ERROR, "Failed getting pointer shape: %lx\n", hr);
return AVERROR_EXTERNAL;
}
if (shape_info.Type == DXGI_OUTDUPL_POINTER_SHAPE_TYPE_MONOCHROME) {
uint8_t *new_buf = convert_mono_buffer(buf, &shape_info.Width, &shape_info.Height, &shape_info.Pitch);
av_free(buf);
if (!new_buf)
return AVERROR(ENOMEM);
buf = new_buf;
} else if (shape_info.Type == DXGI_OUTDUPL_POINTER_SHAPE_TYPE_MASKED_COLOR) {
fixup_color_mask(buf, shape_info.Width, shape_info.Height, shape_info.Pitch);
} else if (shape_info.Type != DXGI_OUTDUPL_POINTER_SHAPE_TYPE_COLOR) {
av_log(avctx, AV_LOG_WARNING, "Unsupported pointer shape type: %d\n", (int)shape_info.Type);
av_free(buf);
return 0;
}
release_resource(&dda->mouse_resource_view);
release_resource(&dda->mouse_texture);
ret = create_d3d11_pointer_tex(avctx, buf, &shape_info, &dda->mouse_texture, &dda->mouse_resource_view);
av_freep(&buf);
if (ret < 0)
return ret;
av_log(avctx, AV_LOG_VERBOSE, "Updated pointer shape texture\n");
}
return 0;
}
static int next_frame_internal(AVFilterContext *avctx, ID3D11Texture2D **desktop_texture)
{
DXGI_OUTDUPL_FRAME_INFO frame_info;
DdagrabContext *dda = avctx->priv;
IDXGIResource *desktop_resource = NULL;
HRESULT hr;
int ret;
hr = IDXGIOutputDuplication_AcquireNextFrame(
dda->dxgi_outdupl,
dda->time_timeout,
&frame_info,
&desktop_resource);
if (hr == DXGI_ERROR_WAIT_TIMEOUT) {
return AVERROR(EAGAIN);
} else if (FAILED(hr)) {
av_log(avctx, AV_LOG_ERROR, "AcquireNextFrame failed: %lx\n", hr);
return AVERROR_EXTERNAL;
}
if (dda->draw_mouse) {
ret = update_mouse_pointer(avctx, &frame_info);
if (ret < 0)
return ret;
}
hr = IDXGIResource_QueryInterface(desktop_resource, &IID_ID3D11Texture2D, (void**)desktop_texture);
IDXGIResource_Release(desktop_resource);
desktop_resource = NULL;
if (FAILED(hr)) {
av_log(avctx, AV_LOG_ERROR, "DXGIResource QueryInterface failed\n");
return AVERROR_EXTERNAL;
}
return 0;
}
static int probe_output_format(AVFilterContext *avctx)
{
DdagrabContext *dda = avctx->priv;
D3D11_TEXTURE2D_DESC desc;
int ret;
av_assert1(!dda->probed_texture);
do {
ret = next_frame_internal(avctx, &dda->probed_texture);
} while(ret == AVERROR(EAGAIN));
if (ret < 0)
return ret;
ID3D11Texture2D_GetDesc(dda->probed_texture, &desc);
dda->raw_format = desc.Format;
dda->raw_width = desc.Width;
dda->raw_height = desc.Height;
if (dda->width <= 0)
dda->width = dda->raw_width;
if (dda->height <= 0)
dda->height = dda->raw_height;
return 0;
}
static av_cold int init_hwframes_ctx(AVFilterContext *avctx)
{
DdagrabContext *dda = avctx->priv;
int ret = 0;
dda->frames_ref = av_hwframe_ctx_alloc(dda->device_ref);
if (!dda->frames_ref)
return AVERROR(ENOMEM);
dda->frames_ctx = (AVHWFramesContext*)dda->frames_ref->data;
dda->frames_hwctx = (AVD3D11VAFramesContext*)dda->frames_ctx->hwctx;
dda->frames_ctx->format = AV_PIX_FMT_D3D11;
dda->frames_ctx->width = dda->width;
dda->frames_ctx->height = dda->height;
switch (dda->raw_format) {
case DXGI_FORMAT_B8G8R8A8_UNORM:
av_log(avctx, AV_LOG_VERBOSE, "Probed 8 bit RGB frame format\n");
dda->frames_ctx->sw_format = AV_PIX_FMT_BGRA;
break;
case DXGI_FORMAT_R10G10B10A2_UNORM:
av_log(avctx, AV_LOG_VERBOSE, "Probed 10 bit RGB frame format\n");
dda->frames_ctx->sw_format = AV_PIX_FMT_X2BGR10;
break;
default:
av_log(avctx, AV_LOG_ERROR, "Unexpected texture output format!\n");
return AVERROR_BUG;
}
if (dda->draw_mouse)
dda->frames_hwctx->BindFlags |= D3D11_BIND_RENDER_TARGET;
ret = av_hwframe_ctx_init(dda->frames_ref);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "Failed to initialise hardware frames context: %d.\n", ret);
goto fail;
}
return 0;
fail:
av_buffer_unref(&dda->frames_ref);
return ret;
}
static int ddagrab_config_props(AVFilterLink *outlink)
{
AVFilterContext *avctx = outlink->src;
DdagrabContext *dda = avctx->priv;
int ret;
ret = probe_output_format(avctx);
if (ret < 0)
return ret;
dda->width -= FFMAX(dda->width - dda->raw_width + dda->offset_x, 0);
dda->height -= FFMAX(dda->height - dda->raw_height + dda->offset_y, 0);
ret = init_hwframes_ctx(avctx);
if (ret < 0)
return ret;
outlink->hw_frames_ctx = av_buffer_ref(dda->frames_ref);
if (!outlink->hw_frames_ctx)
return AVERROR(ENOMEM);
outlink->w = dda->width;
outlink->h = dda->height;
outlink->time_base = (AVRational){1, TIMER_RES};
outlink->frame_rate = dda->framerate;
return 0;
}
static int draw_mouse_pointer(AVFilterContext *avctx, AVFrame *frame)
{
DdagrabContext *dda = avctx->priv;
ID3D11DeviceContext *devctx = dda->device_hwctx->device_context;
ID3D11Texture2D *frame_tex = (ID3D11Texture2D*)frame->data[0];
D3D11_RENDER_TARGET_VIEW_DESC target_desc = { 0 };
ID3D11RenderTargetView* target_view = NULL;
ID3D11Buffer *mouse_vertex_buffer = NULL;
D3D11_TEXTURE2D_DESC tex_desc;
int num_vertices = 0;
int x, y;
HRESULT hr;
int ret = 0;
if (!dda->mouse_texture || dda->mouse_x < 0 || dda->mouse_y < 0)
return 0;
ID3D11Texture2D_GetDesc(dda->mouse_texture, &tex_desc);
x = dda->mouse_x - dda->offset_x;
y = dda->mouse_y - dda->offset_y;
if (x >= dda->width || y >= dda->height ||
-x >= (int)tex_desc.Width || -y >= (int)tex_desc.Height)
return 0;
target_desc.Format = dda->raw_format;
target_desc.ViewDimension = D3D11_RTV_DIMENSION_TEXTURE2D;
target_desc.Texture2D.MipSlice = 0;
hr = ID3D11Device_CreateRenderTargetView(dda->device_hwctx->device,
(ID3D11Resource*)frame_tex,
&target_desc,
&target_view);
if (FAILED(hr)) {
av_log(avctx, AV_LOG_ERROR, "CreateRenderTargetView failed: %lx\n", hr);
ret = AVERROR_EXTERNAL;
goto end;
}
ID3D11DeviceContext_ClearState(devctx);
{
D3D11_VIEWPORT viewport = { 0 };
viewport.Width = dda->width;
viewport.Height = dda->height;
viewport.MinDepth = 0.0f;
viewport.MaxDepth = 1.0f;
ID3D11DeviceContext_RSSetViewports(devctx, 1, &viewport);
}
{
FLOAT vertices[] = {
// x, y, z, u, v
x , y + tex_desc.Height, 0.0f, 0.0f, 1.0f,
x , y , 0.0f, 0.0f, 0.0f,
x + tex_desc.Width, y + tex_desc.Height, 0.0f, 1.0f, 1.0f,
x + tex_desc.Width, y , 0.0f, 1.0f, 0.0f,
};
UINT stride = sizeof(FLOAT) * 5;
UINT offset = 0;
D3D11_SUBRESOURCE_DATA init_data = { 0 };
D3D11_BUFFER_DESC buf_desc = { 0 };
num_vertices = sizeof(vertices) / (sizeof(FLOAT) * 5);
buf_desc.Usage = D3D11_USAGE_DEFAULT;
buf_desc.BindFlags = D3D11_BIND_VERTEX_BUFFER;
buf_desc.ByteWidth = sizeof(vertices);
init_data.pSysMem = vertices;
hr = ID3D11Device_CreateBuffer(dda->device_hwctx->device,
&buf_desc,
&init_data,
&mouse_vertex_buffer);
if (FAILED(hr)) {
av_log(avctx, AV_LOG_ERROR, "CreateBuffer failed: %lx\n", hr);
ret = AVERROR_EXTERNAL;
goto end;
}
ID3D11DeviceContext_IASetVertexBuffers(devctx, 0, 1, &mouse_vertex_buffer, &stride, &offset);
ID3D11DeviceContext_IASetInputLayout(devctx, dda->input_layout);
ID3D11DeviceContext_IASetPrimitiveTopology(devctx, D3D11_PRIMITIVE_TOPOLOGY_TRIANGLESTRIP);
}
ID3D11DeviceContext_VSSetShader(devctx, dda->vertex_shader, NULL, 0);
ID3D11DeviceContext_VSSetConstantBuffers(devctx, 0, 1, &dda->const_buffer);
ID3D11DeviceContext_PSSetSamplers(devctx, 0, 1, &dda->sampler_state);
ID3D11DeviceContext_PSSetShaderResources(devctx, 0, 1, &dda->mouse_resource_view);
ID3D11DeviceContext_PSSetShader(devctx, dda->pixel_shader, NULL, 0);
ID3D11DeviceContext_OMSetBlendState(devctx, dda->blend_state, NULL, 0xFFFFFFFF);
ID3D11DeviceContext_OMSetRenderTargets(devctx, 1, &target_view, NULL);
ID3D11DeviceContext_Draw(devctx, num_vertices, 0);
end:
release_resource(&mouse_vertex_buffer);
release_resource(&target_view);
return ret;
}
static int ddagrab_request_frame(AVFilterLink *outlink)
{
AVFilterContext *avctx = outlink->src;
DdagrabContext *dda = avctx->priv;
ID3D11Texture2D *cur_texture = NULL;
D3D11_TEXTURE2D_DESC desc = { 0 };
D3D11_BOX box = { 0 };
int64_t time_frame = dda->time_frame;
int64_t now, delay;
AVFrame *frame = NULL;
HRESULT hr;
int ret;
/* time_frame is in units of microseconds divided by the time_base.
* This means that adding a clean 1M to it is the equivalent of adding
* 1M*time_base microseconds to it, except it avoids all rounding error.
* The only time rounding error occurs is when multiplying to calculate
* the delay. So any rounding error there corrects itself over time.
*/
time_frame += TIMER_RES64;
for (;;) {
now = av_gettime_relative();
delay = time_frame * av_q2d(dda->time_base) - now;
if (delay <= 0) {
if (delay < -TIMER_RES64 * av_q2d(dda->time_base)) {
time_frame += TIMER_RES64;
}
break;
}
av_usleep(delay);
}
if (!dda->first_pts)
dda->first_pts = now;
now -= dda->first_pts;
if (!dda->probed_texture) {
ret = next_frame_internal(avctx, &cur_texture);
} else {
cur_texture = dda->probed_texture;
dda->probed_texture = NULL;
ret = 0;
}
if (ret == AVERROR(EAGAIN) && dda->last_frame->buf[0]) {
frame = av_frame_alloc();
if (!frame)
return AVERROR(ENOMEM);
ret = av_frame_ref(frame, dda->last_frame);
if (ret < 0) {
av_frame_free(&frame);
return ret;
}
av_log(avctx, AV_LOG_DEBUG, "Duplicated output frame\n");
goto frame_done;
} else if (ret == AVERROR(EAGAIN)) {
av_log(avctx, AV_LOG_VERBOSE, "Initial DDA AcquireNextFrame timeout!\n");
return AVERROR(EAGAIN);
} else if (ret < 0) {
return ret;
}
// AcquireNextFrame sometimes has bursts of delay.
// This increases accuracy of the timestamp, but might upset consumers due to more jittery framerate?
now = av_gettime_relative() - dda->first_pts;
ID3D11Texture2D_GetDesc(cur_texture, &desc);
if (desc.Format != dda->raw_format ||
(int)desc.Width != dda->raw_width ||
(int)desc.Height != dda->raw_height) {
av_log(avctx, AV_LOG_ERROR, "Output parameters changed!");
ret = AVERROR_OUTPUT_CHANGED;
goto fail;
}
frame = ff_get_video_buffer(outlink, dda->width, dda->height);
if (!frame) {
ret = AVERROR(ENOMEM);
goto fail;
}
box.left = dda->offset_x;
box.top = dda->offset_y;
box.right = box.left + dda->width;
box.bottom = box.top + dda->height;
box.front = 0;
box.back = 1;
ID3D11DeviceContext_CopySubresourceRegion(
dda->device_hwctx->device_context,
(ID3D11Resource*)frame->data[0], (UINT)(intptr_t)frame->data[1],
0, 0, 0,
(ID3D11Resource*)cur_texture, 0,
&box);
release_resource(&cur_texture);
hr = IDXGIOutputDuplication_ReleaseFrame(dda->dxgi_outdupl);
if (FAILED(hr)) {
av_log(avctx, AV_LOG_ERROR, "DDA ReleaseFrame failed!\n");
ret = AVERROR_EXTERNAL;
goto fail;
}
if (dda->draw_mouse) {
ret = draw_mouse_pointer(avctx, frame);
if (ret < 0)
goto fail;
}
frame->sample_aspect_ratio = (AVRational){1, 1};
av_frame_unref(dda->last_frame);
ret = av_frame_ref(dda->last_frame, frame);
if (ret < 0)
return ret;
frame_done:
frame->pts = now;
dda->time_frame = time_frame;
return ff_filter_frame(outlink, frame);
fail:
if (frame)
av_frame_free(&frame);
if (cur_texture)
IDXGIOutputDuplication_ReleaseFrame(dda->dxgi_outdupl);
release_resource(&cur_texture);
return ret;
}
static const AVFilterPad ddagrab_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.request_frame = ddagrab_request_frame,
.config_props = ddagrab_config_props,
},
};
const AVFilter ff_vsrc_ddagrab = {
.name = "ddagrab",
.description = NULL_IF_CONFIG_SMALL("Grab Windows Desktop images using Desktop Duplication API"),
.priv_size = sizeof(DdagrabContext),
.priv_class = &ddagrab_class,
.init = ddagrab_init,
.uninit = ddagrab_uninit,
.inputs = NULL,
FILTER_OUTPUTS(ddagrab_outputs),
FILTER_SINGLE_PIXFMT(AV_PIX_FMT_D3D11),
.flags_internal = FF_FILTER_FLAG_HWFRAME_AWARE,
};
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