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e74278a04209070fa648e73c7c392e719fc78d09
gpu-screen-recorder/src/main.cpp
dec05eba e74278a042 Fix frame timing
2020-03-30 17:24:31 +02:00

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#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <string>
#include <vector>
#define GLX_GLXEXT_PROTOTYPES
#include <GL/glew.h>
#include <GLFW/glfw3.h>
#include <GL/glx.h>
#include <GL/glxext.h>
#include <X11/extensions/Xcomposite.h>
#include <X11/extensions/Xdamage.h>
extern "C" {
#include <libavutil/hwcontext_cuda.h>
#include <libavcodec/avcodec.h>
#include <libavformat/avformat.h>
#include <libavutil/hwcontext.h>
}
#include <cudaGL.h>
extern "C" {
#include <libavutil/hwcontext.h>
}
//#include <CL/cl.h>
struct ScopedGLXFBConfig {
~ScopedGLXFBConfig() {
if(configs)
XFree(configs);
}
GLXFBConfig *configs = nullptr;
};
struct WindowPixmap {
WindowPixmap() : pixmap(None), glx_pixmap(None), texture_id(0), target_texture_id(0), texture_width(0), texture_height(0) {
}
Pixmap pixmap;
GLXPixmap glx_pixmap;
GLuint texture_id;
GLuint target_texture_id;
GLint texture_width;
GLint texture_height;
};
static bool x11_supports_composite_named_window_pixmap(Display *dpy) {
int extension_major;
int extension_minor;
if(!XCompositeQueryExtension(dpy, &extension_major, &extension_minor))
return false;
int major_version;
int minor_version;
return XCompositeQueryVersion(dpy, &major_version, &minor_version) && (major_version > 0 || minor_version >= 2);
}
static void cleanup_window_pixmap(Display *dpy, WindowPixmap &pixmap) {
if(pixmap.target_texture_id) {
glDeleteTextures(1, &pixmap.target_texture_id);
pixmap.target_texture_id = 0;
}
if(pixmap.texture_id) {
glDeleteTextures(1, &pixmap.texture_id);
pixmap.texture_id = 0;
pixmap.texture_width = 0;
pixmap.texture_height = 0;
}
if(pixmap.glx_pixmap) {
glXReleaseTexImageEXT(dpy, pixmap.glx_pixmap, GLX_FRONT_EXT);
glXDestroyPixmap(dpy, pixmap.glx_pixmap);
pixmap.glx_pixmap = None;
}
if(pixmap.pixmap) {
XFreePixmap(dpy, pixmap.pixmap);
pixmap.pixmap = None;
}
}
static bool recreate_window_pixmap(Display *dpy, Window window_id, WindowPixmap &pixmap) {
cleanup_window_pixmap(dpy, pixmap);
const int pixmap_config[] = {
GLX_BIND_TO_TEXTURE_RGBA_EXT, True,
GLX_DRAWABLE_TYPE, GLX_PIXMAP_BIT,
GLX_BIND_TO_TEXTURE_TARGETS_EXT, GLX_TEXTURE_2D_BIT_EXT,
GLX_BIND_TO_MIPMAP_TEXTURE_EXT, True,
GLX_DOUBLEBUFFER, False,
//GLX_Y_INVERTED_EXT, (int)GLX_DONT_CARE,
None
};
// Note that mipmap is generated even though its not used.
// glCopyImageSubData fails if the texture doesn't have mipmap.
const int pixmap_attribs[] = {
GLX_TEXTURE_TARGET_EXT, GLX_TEXTURE_2D_EXT,
GLX_TEXTURE_FORMAT_EXT, GLX_TEXTURE_FORMAT_RGBA_EXT,
GLX_MIPMAP_TEXTURE_EXT, 1,
None
};
int c;
GLXFBConfig *configs = glXChooseFBConfig(dpy, 0, pixmap_config, &c);
if(!configs) {
fprintf(stderr, "Failed too choose fb config\n");
return false;
}
ScopedGLXFBConfig scoped_configs;
scoped_configs.configs = configs;
Pixmap new_window_pixmap = XCompositeNameWindowPixmap(dpy, window_id);
if(!new_window_pixmap) {
fprintf(stderr, "Failed to get pixmap for window %ld\n", window_id);
return false;
}
GLXPixmap glx_pixmap = glXCreatePixmap(dpy, *configs, new_window_pixmap, pixmap_attribs);
if(!glx_pixmap) {
fprintf(stderr, "Failed to create glx pixmap\n");
XFreePixmap(dpy, new_window_pixmap);
return false;
}
pixmap.pixmap = new_window_pixmap;
pixmap.glx_pixmap = glx_pixmap;
glEnable(GL_TEXTURE_2D);
glGenTextures(1, &pixmap.texture_id);
glBindTexture(GL_TEXTURE_2D, pixmap.texture_id);
//glEnable(GL_BLEND);
//glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glXBindTexImageEXT(dpy, pixmap.glx_pixmap, GLX_FRONT_EXT, NULL);
glGenerateMipmap(GL_TEXTURE_2D);
glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_WIDTH, &pixmap.texture_width);
glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_HEIGHT, &pixmap.texture_height);
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);//GL_LINEAR );
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);//GL_LINEAR);//GL_LINEAR_MIPMAP_LINEAR );
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
printf("texture width: %d, height: %d\n", pixmap.texture_width, pixmap.texture_height);
// Generating this second texture is needed because cuGraphicsGLRegisterImage
// cant be used with the texture that is mapped directly to the pixmap.
// TODO: Investigate if it's somehow possible to use the pixmap texture directly,
// this should improve performance since only less image copy is then needed every frame.
glGenTextures(1, &pixmap.target_texture_id);
glBindTexture(GL_TEXTURE_2D, pixmap.target_texture_id);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, pixmap.texture_width, pixmap.texture_height, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
glGenerateMipmap(GL_TEXTURE_2D);
int err2 = glGetError();
printf("error: %d\n", err2);
glCopyImageSubData(
pixmap.texture_id, GL_TEXTURE_2D, 0, 0, 0, 0,
pixmap.target_texture_id, GL_TEXTURE_2D, 0, 0, 0, 0,
pixmap.texture_width, pixmap.texture_height, 1);
int err = glGetError();
printf("error: %d\n", err);
//glXBindTexImageEXT(dpy, pixmap.glx_pixmap, GLX_FRONT_EXT, NULL);
//glGenerateTextureMipmapEXT(glxpixmap, GL_TEXTURE_2D);
//glGenerateMipmap(GL_TEXTURE_2D);
//glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE );
//glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE );
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);//GL_LINEAR );
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);//GL_LINEAR);//GL_LINEAR_MIPMAP_LINEAR );
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
glBindTexture(GL_TEXTURE_2D, 0);
return pixmap.texture_id != 0 && pixmap.target_texture_id != 0;
}
std::vector<std::string> get_hardware_acceleration_device_names() {
int iGpu = 0;
int nGpu = 0;
cuDeviceGetCount(&nGpu);
if(iGpu < 0 || iGpu >= nGpu) {
fprintf(stderr, "Error: failed...\n");
return {};
}
CUdevice cuDevice = 0;
cuDeviceGet(&cuDevice, iGpu);
char deviceName[80];
cuDeviceGetName(deviceName, sizeof(deviceName), cuDevice);
printf("device name: %s\n", deviceName);
return { deviceName };
}
static void receive_frames(AVCodecContext *av_codec_context, AVStream *stream, AVFormatContext *av_format_context) {
AVPacket av_packet;
av_init_packet(&av_packet);
for( ; ; ) {
av_packet.data = NULL;
av_packet.size = 0;
int res = avcodec_receive_packet(av_codec_context, &av_packet);
if(res == 0) { // we have a packet, send the packet to the muxer
av_packet_rescale_ts(&av_packet, av_codec_context->time_base, stream->time_base);
av_packet.stream_index = stream->index;
if(av_write_frame(av_format_context, &av_packet) < 0) {
fprintf(stderr, "Error: Failed to write frame to muxer\n");
}
//av_packet_unref(&av_packet);
} else if(res == AVERROR(EAGAIN)) { // we have no packet
//printf("No packet!\n");
break;
} else if(res == AVERROR_EOF) { // this is the end of the stream
printf("End of stream!\n");
break;
} else {
printf("Unexpected error: %d\n", res);
break;
}
}
av_packet_unref(&av_packet);
}
static AVStream* add_stream(AVFormatContext *av_format_context, AVCodec **codec, enum AVCodecID codec_id, const WindowPixmap &window_pixmap) {
//*codec = avcodec_find_encoder(codec_id);
*codec = avcodec_find_encoder_by_name("h264_nvenc");
if(!*codec) {
*codec = avcodec_find_encoder_by_name("nvenc_h264");
}
if(!*codec) {
fprintf(stderr, "Error: Could not find h264_nvenc or nvenc_h264 encoder for %s\n", avcodec_get_name(codec_id));
exit(1);
}
AVStream *stream = avformat_new_stream(av_format_context, *codec);
if(!stream) {
fprintf(stderr, "Error: Could not allocate stream\n");
exit(1);
}
stream->id = av_format_context->nb_streams - 1;
AVCodecContext *codec_context = stream->codec;
switch((*codec)->type) {
case AVMEDIA_TYPE_AUDIO: {
codec_context->sample_fmt = (*codec)->sample_fmts ? (*codec)->sample_fmts[0] : AV_SAMPLE_FMT_FLTP;
codec_context->bit_rate = 64000;
codec_context->sample_rate = 44100;
codec_context->channels = 2;
break;
}
case AVMEDIA_TYPE_VIDEO: {
codec_context->codec_id = codec_id;
codec_context->bit_rate = 8000000;
// Resolution must be a multiple of two
codec_context->width = window_pixmap.texture_width & ~1;
codec_context->height = window_pixmap.texture_height & ~1;
// Timebase: This is the fundamental unit of time (in seconds) in terms of
// which frame timestamps are represented. For fixed-fps content,
// timebase should be 1/framerate and timestamp increments should be identical to 1
codec_context->time_base.num = 1;
codec_context->time_base.den = 60;
//codec_context->framerate.num = 60;
//codec_context->framerate.den = 1;
codec_context->sample_aspect_ratio.num = 1;
codec_context->sample_aspect_ratio.den = 1;
codec_context->gop_size = 12; // Emit one intra frame every twelve frames at most
codec_context->pix_fmt = AV_PIX_FMT_CUDA;
if(codec_context->codec_id == AV_CODEC_ID_MPEG1VIDEO)
codec_context->mb_decision = 2;
//stream->time_base = codec_context->time_base;
//codec_context->ticks_per_frame = 30;
break;
}
default:
break;
}
// Some formats want stream headers to be seperate
if(av_format_context->oformat->flags & AVFMT_GLOBALHEADER)
av_format_context->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
return stream;
}
static void open_video(AVCodec *codec, AVStream *stream, WindowPixmap &window_pixmap, AVBufferRef **device_ctx, CUgraphicsResource *cuda_graphics_resource) {
int ret;
AVCodecContext *codec_context = stream->codec;
std::vector<std::string> hardware_accelerated_devices = get_hardware_acceleration_device_names();
if(hardware_accelerated_devices.empty()) {
fprintf(stderr, "Error: No hardware accelerated device was found on your system\n");
exit(1);
}
if(av_hwdevice_ctx_create(device_ctx, AV_HWDEVICE_TYPE_CUDA, hardware_accelerated_devices[0].c_str(), NULL, 0) < 0) {
fprintf(stderr, "Error: Failed to create hardware device context for gpu: %s\n", hardware_accelerated_devices[0].c_str());
exit(1);
}
AVBufferRef *frame_context = av_hwframe_ctx_alloc(*device_ctx);
if(!frame_context) {
fprintf(stderr, "Error: Failed to create hwframe context\n");
exit(1);
}
AVHWFramesContext *hw_frame_context = (AVHWFramesContext*)frame_context->data;
hw_frame_context->width = codec_context->width;
hw_frame_context->height = codec_context->height;
hw_frame_context->sw_format = AV_PIX_FMT_0BGR32;
hw_frame_context->format = codec_context->pix_fmt;
hw_frame_context->device_ref = *device_ctx;
hw_frame_context->device_ctx = (AVHWDeviceContext*)(*device_ctx)->data;
if(av_hwframe_ctx_init(frame_context) < 0) {
fprintf(stderr, "Error: Failed to initialize hardware frame context (note: ffmpeg version needs to be > 4.0\n");
exit(1);
}
codec_context->hw_device_ctx = *device_ctx;
codec_context->hw_frames_ctx = frame_context;
ret = avcodec_open2(codec_context, codec, nullptr);
if(ret < 0) {
fprintf(stderr, "Error: Could not open video codec: %s\n", "blabla");//av_err2str(ret));
exit(1);
}
AVHWDeviceContext *hw_device_context = (AVHWDeviceContext*)(*device_ctx)->data;
AVCUDADeviceContext *cuda_device_context = (AVCUDADeviceContext*)hw_device_context->hwctx;
CUcontext *cuda_context = &(cuda_device_context->cuda_ctx);
if(!cuda_context) {
fprintf(stderr, "Error: No cuda context\n");
exit(1);
}
CUresult res;
CUcontext old_ctx;
res = cuCtxPopCurrent(&old_ctx);
res = cuCtxPushCurrent(*cuda_context);
res = cuGraphicsGLRegisterImage(cuda_graphics_resource, window_pixmap.target_texture_id, GL_TEXTURE_2D, CU_GRAPHICS_REGISTER_FLAGS_READ_ONLY);
//cuGraphicsUnregisterResource(*cuda_graphics_resource);
if(res != CUDA_SUCCESS) {
fprintf(stderr, "Error: cuGraphicsGLRegisterImage failed, error %d, texture id: %u\n", res, window_pixmap.target_texture_id);
exit(1);
}
res = cuCtxPopCurrent(&old_ctx);
}
static void close_video(AVStream *video_stream, AVFrame *frame) {
//avcodec_close(video_stream->codec);
//av_frame_free(&frame);
}
int main(int argc, char **argv) {
if(argc < 2) {
fprintf(stderr, "usage: hardware-screen-recorder <window_id>\n");
return 1;
}
Window src_window_id = strtol(argv[1], nullptr, 0);
Display *dpy = XOpenDisplay(nullptr);
if(!dpy) {
fprintf(stderr, "Error: Failed to open display\n");
return 1;
}
bool has_name_pixmap = x11_supports_composite_named_window_pixmap(dpy);
if(!has_name_pixmap) {
fprintf(stderr, "Error: XCompositeNameWindowPixmap is not supported by your X11 server\n");
return 1;
}
// TODO: Verify if this is needed
int screen_count = ScreenCount(dpy);
for(int i = 0; i < screen_count; ++i) {
XCompositeRedirectSubwindows(dpy, RootWindow(dpy, i), CompositeRedirectAutomatic);
}
XWindowAttributes attr;
if(!XGetWindowAttributes(dpy, src_window_id, &attr)) {
fprintf(stderr, "Error: Invalid window id: %lu\n", src_window_id);
return 1;
}
//glXMakeContextCurrent(Display *dpy, GLXDrawable draw, GLXDrawable read, GLXContext ctx)
if(!glfwInit()) {
fprintf(stderr, "Error: Failed to initialize glfw\n");
return 1;
}
glfwWindowHint(GLFW_RESIZABLE, GL_FALSE);
GLFWwindow *window = glfwCreateWindow(1280, 720, "Hello world", nullptr, nullptr);
if(!window) {
fprintf(stderr, "Error: Failed to create glfw window\n");
glfwTerminate();
return 1;
}
glfwMakeContextCurrent(window);
glfwSwapInterval(0);
glewExperimental = GL_TRUE;
GLenum nGlewError = glewInit();
if (nGlewError != GLEW_OK) {
fprintf(stderr, "%s - Error initializing GLEW! %s\n", __FUNCTION__, glewGetErrorString(nGlewError));
return 1;
}
glGetError(); // to clear the error caused deep in GLEW
WindowPixmap window_pixmap;
if(!recreate_window_pixmap(dpy, src_window_id, window_pixmap)) {
fprintf(stderr, "Error: Failed to create glx pixmap for window: %lu\n", src_window_id);
return 1;
}
const char *filename = "test_video.mp4";
// Video start
AVFormatContext *av_format_context;
// The output format is automatically guessed by the file extension
avformat_alloc_output_context2(&av_format_context, nullptr, nullptr, filename);
if(!av_format_context) {
fprintf(stderr, "Error: Failed to deduce output format from file extension .mp4\n");
return 1;
}
AVOutputFormat *output_format = av_format_context->oformat;
AVCodec *video_codec;
AVStream *video_stream = add_stream(av_format_context, &video_codec, output_format->video_codec, window_pixmap);
if(!video_stream) {
fprintf(stderr, "Error: Failed to create video stream\n");
return 1;
}
if(cuInit(0) < 0) {
fprintf(stderr, "Error: cuInit failed\n");
return {};
}
AVBufferRef *device_ctx;
CUgraphicsResource cuda_graphics_resource;
open_video(video_codec, video_stream, window_pixmap, &device_ctx, &cuda_graphics_resource);
av_dump_format(av_format_context, 0, filename, 1);
if(!(output_format->flags & AVFMT_NOFILE)) {
int ret = avio_open(&av_format_context->pb, filename, AVIO_FLAG_WRITE);
if(ret < 0) {
fprintf(stderr, "Error: Could not open '%s': %s\n", filename, "blabla");//av_err2str(ret));
return 1;
}
}
int ret = avformat_write_header(av_format_context, nullptr);
if(ret < 0) {
fprintf(stderr, "Error occurred when opening output file: %s\n", "blabla");//av_err2str(ret));
return 1;
}
AVHWDeviceContext *hw_device_context = (AVHWDeviceContext*)device_ctx->data;
AVCUDADeviceContext *cuda_device_context = (AVCUDADeviceContext*)hw_device_context->hwctx;
CUcontext *cuda_context = &(cuda_device_context->cuda_ctx);
if(!cuda_context) {
fprintf(stderr, "Error: No cuda context\n");
exit(1);
}
//av_frame_free(&rgb_frame);
//avcodec_close(av_codec_context);
XSelectInput(dpy, src_window_id, StructureNotifyMask);
int damage_event;
int damage_error;
if(!XDamageQueryExtension(dpy, &damage_event, &damage_error)) {
fprintf(stderr, "Error: XDamage is not supported by your X11 server\n");
return 1;
}
Damage xdamage = XDamageCreate(dpy, src_window_id, XDamageReportNonEmpty);
int frame_count = 0;
CUresult res;
CUcontext old_ctx;
res = cuCtxPopCurrent(&old_ctx);
res = cuCtxPushCurrent(*cuda_context);
// Get texture
res = cuGraphicsResourceSetMapFlags(cuda_graphics_resource, CU_GRAPHICS_MAP_RESOURCE_FLAGS_READ_ONLY);
res = cuGraphicsMapResources(1, &cuda_graphics_resource, 0);
// Map texture to cuda array
CUarray mapped_array;
res = cuGraphicsSubResourceGetMappedArray(&mapped_array, cuda_graphics_resource, 0, 0);
// Release texture
//res = cuGraphicsUnmapResources(1, &cuda_graphics_resource, 0);
double start_time = glfwGetTime();
double frame_timer_start = start_time;
int fps = 0;
int current_fps = 30;
AVFrame *frame = av_frame_alloc();
if(!frame) {
fprintf(stderr, "Error: Failed to allocate frame\n");
exit(1);
}
frame->format = video_stream->codec->pix_fmt;
frame->width = video_stream->codec->width;
frame->height = video_stream->codec->height;
if(av_hwframe_get_buffer(video_stream->codec->hw_frames_ctx, frame, 0) < 0) {
fprintf(stderr, "Error: av_hwframe_get_buffer failed\n");
exit(1);
}
XEvent e;
while(!glfwWindowShouldClose(window)) {
glClear(GL_COLOR_BUFFER_BIT);
glfwSwapBuffers(window);
glfwPollEvents();
if (XCheckTypedEvent(dpy, ConfigureNotify, &e)) {
// Window resize
printf("Resize window!\n");
recreate_window_pixmap(dpy, src_window_id, window_pixmap);
}
if (XCheckTypedEvent(dpy, damage_event + XDamageNotify, &e)) {
//printf("Redraw!\n");
XDamageNotifyEvent *de = (XDamageNotifyEvent*)&e;
// de->drawable is the window ID of the damaged window
XserverRegion region = XFixesCreateRegion(dpy, nullptr, 0);
// Subtract all the damage, repairing the window
XDamageSubtract(dpy, de->damage, None, region);
XFixesDestroyRegion(dpy, region);
// TODO: Use a framebuffer instead. glCopyImageSubData requires opengl 4.2
glCopyImageSubData(
window_pixmap.texture_id, GL_TEXTURE_2D, 0, 0, 0, 0,
window_pixmap.target_texture_id, GL_TEXTURE_2D, 0, 0, 0, 0,
window_pixmap.texture_width, window_pixmap.texture_height, 1);
//int err = glGetError();
//printf("error: %d\n", err);
CUDA_MEMCPY2D memcpy_struct;
memcpy_struct.srcXInBytes = 0;
memcpy_struct.srcY = 0;
memcpy_struct.srcMemoryType = CUmemorytype::CU_MEMORYTYPE_ARRAY;
memcpy_struct.dstXInBytes = 0;
memcpy_struct.dstY = 0;
memcpy_struct.dstMemoryType = CUmemorytype::CU_MEMORYTYPE_DEVICE;
memcpy_struct.srcArray = mapped_array;
memcpy_struct.dstDevice = (CUdeviceptr)frame->data[0];
memcpy_struct.dstPitch = frame->linesize[0];
memcpy_struct.WidthInBytes = frame->width * 4;
memcpy_struct.Height = frame->height;
cuMemcpy2D(&memcpy_struct);
//res = cuCtxPopCurrent(&old_ctx);
}
++fps;
const double target_fps = 0.0166666666;
double time_now = glfwGetTime();
double frame_timer_elapsed = time_now - frame_timer_start;
double elapsed = time_now - start_time;
if(elapsed >= 1.0) {
printf("fps: %d\n", fps);
start_time = time_now;
current_fps = fps;
fps = 0;
}
double frame_time_overflow = frame_timer_elapsed - target_fps;
if(frame_time_overflow >= 0.0) {
frame_timer_start = time_now - frame_time_overflow;
frame->pts = frame_count;
frame_count += 1;
if(avcodec_send_frame(video_stream->codec, frame) < 0) {
fprintf(stderr, "Error: avcodec_send_frame failed\n");
} else {
receive_frames(video_stream->codec, video_stream, av_format_context);
}
}
//av_frame_free(&frame);
}
if(av_write_trailer(av_format_context) != 0) {
fprintf(stderr, "Failed to write trailer\n");
}
//close_video(video_stream, NULL);
// if(!(output_format->flags & AVFMT_NOFILE))
// avio_close(av_format_context->pb);
//avformat_free_context(av_format_context);
//XDamageDestroy(dpy, xdamage);
//cleanup_window_pixmap(dpy, window_pixmap);
for(int i = 0; i < screen_count; ++i) {
XCompositeUnredirectSubwindows(dpy, RootWindow(dpy, i), CompositeRedirectAutomatic);
}
XCloseDisplay(dpy);
}
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