Separate video encoding method from capture method

With this instead of kms_cuda/kms_vaapi/kms_software and
xcomposite_cuda/xcomposite_vaapi/xcomposite_software there
is now only kms and xcomposite.

1 files changed, 236 insertions, 0 deletions

diff --git a/src/encoder/video/cuda.c b/src/encoder/video/cuda.c
new file mode 100644
index 0000000..2568bc7
--- /dev/null
+++ b/src/encoder/video/cuda.c
@@ -0,0 +1,236 @@
+#include "../../../include/encoder/video/cuda.h"
+#include "../../../include/egl.h"
+#include "../../../include/cuda.h"
+
+#include <libavcodec/avcodec.h>
+#include <libavutil/hwcontext_cuda.h>
+
+#include <stdlib.h>
+
+typedef struct {
+    gsr_video_encoder_cuda_params params;
+
+    unsigned int target_textures[2];
+
+    gsr_cuda cuda;
+    CUgraphicsResource cuda_graphics_resources[2];
+    CUarray mapped_arrays[2];
+    CUstream cuda_stream;
+} gsr_video_encoder_cuda;
+
+static bool gsr_video_encoder_cuda_setup_context(gsr_video_encoder_cuda *self, AVCodecContext *video_codec_context) {
+    AVBufferRef *device_ctx = av_hwdevice_ctx_alloc(AV_HWDEVICE_TYPE_CUDA);
+    if(!device_ctx) {
+        fprintf(stderr, "gsr error: gsr_video_encoder_cuda_setup_context failed: failed to create hardware device context\n");
+        return false;
+    }
+
+    AVHWDeviceContext *hw_device_context = (AVHWDeviceContext*)device_ctx->data;
+    AVCUDADeviceContext *cuda_device_context = (AVCUDADeviceContext*)hw_device_context->hwctx;
+    cuda_device_context->cuda_ctx = self->cuda.cu_ctx;
+    if(av_hwdevice_ctx_init(device_ctx) < 0) {
+        fprintf(stderr, "gsr error: gsr_video_encoder_cuda_setup_context failed: failed to create hardware device context\n");
+        av_buffer_unref(&device_ctx);
+        return false;
+    }
+
+    AVBufferRef *frame_context = av_hwframe_ctx_alloc(device_ctx);
+    if(!frame_context) {
+        fprintf(stderr, "gsr error: gsr_video_encoder_cuda_setup_context failed: failed to create hwframe context\n");
+        av_buffer_unref(&device_ctx);
+        return false;
+    }
+
+    AVHWFramesContext *hw_frame_context = (AVHWFramesContext*)frame_context->data;
+    hw_frame_context->width = video_codec_context->width;
+    hw_frame_context->height = video_codec_context->height;
+    hw_frame_context->sw_format = self->params.hdr ? AV_PIX_FMT_P010LE : AV_PIX_FMT_NV12;
+    hw_frame_context->format = video_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, "gsr error: gsr_video_encoder_cuda_setup_context failed: failed to initialize hardware frame context "
+                        "(note: ffmpeg version needs to be > 4.0)\n");
+        av_buffer_unref(&device_ctx);
+        //av_buffer_unref(&frame_context);
+        return false;
+    }
+
+    self->cuda_stream = cuda_device_context->stream;
+    video_codec_context->hw_device_ctx = av_buffer_ref(device_ctx);
+    video_codec_context->hw_frames_ctx = av_buffer_ref(frame_context);
+    return true;
+}
+
+static unsigned int gl_create_texture(gsr_egl *egl, int width, int height, int internal_format, unsigned int format) {
+    unsigned int texture_id = 0;
+    egl->glGenTextures(1, &texture_id);
+    egl->glBindTexture(GL_TEXTURE_2D, texture_id);
+    egl->glTexImage2D(GL_TEXTURE_2D, 0, internal_format, width, height, 0, format, GL_UNSIGNED_BYTE, NULL);
+
+    egl->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+    egl->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+    egl->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+    egl->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+
+    egl->glBindTexture(GL_TEXTURE_2D, 0);
+    return texture_id;
+}
+
+static bool cuda_register_opengl_texture(gsr_cuda *cuda, CUgraphicsResource *cuda_graphics_resource, CUarray *mapped_array, unsigned int texture_id) {
+    CUresult res;
+    res = cuda->cuGraphicsGLRegisterImage(cuda_graphics_resource, texture_id, GL_TEXTURE_2D, CU_GRAPHICS_REGISTER_FLAGS_NONE);
+    if (res != CUDA_SUCCESS) {
+        const char *err_str = "unknown";
+        cuda->cuGetErrorString(res, &err_str);
+        fprintf(stderr, "gsr error: cuda_register_opengl_texture: cuGraphicsGLRegisterImage failed, error: %s, texture " "id: %u\n", err_str, texture_id);
+        return false;
+    }
+
+    res = cuda->cuGraphicsResourceSetMapFlags(*cuda_graphics_resource, CU_GRAPHICS_MAP_RESOURCE_FLAGS_NONE);
+    res = cuda->cuGraphicsMapResources(1, cuda_graphics_resource, 0);
+
+    res = cuda->cuGraphicsSubResourceGetMappedArray(mapped_array, *cuda_graphics_resource, 0, 0);
+    return true;
+}
+
+static bool gsr_video_encoder_cuda_setup_textures(gsr_video_encoder_cuda *self, AVCodecContext *video_codec_context, AVFrame *frame) {
+    const int res = av_hwframe_get_buffer(video_codec_context->hw_frames_ctx, frame, 0);
+    if(res < 0) {
+        fprintf(stderr, "gsr error: gsr_video_encoder_cuda_setup_textures: av_hwframe_get_buffer failed: %d\n", res);
+        return false;
+    }
+
+    const unsigned int internal_formats_nv12[2] = { GL_R8, GL_RG8 };
+    const unsigned int internal_formats_p010[2] = { GL_R16, GL_RG16 };
+    const unsigned int formats[2] = { GL_RED, GL_RG };
+    const int div[2] = {1, 2}; // divide UV texture size by 2 because chroma is half size
+
+    for(int i = 0; i < 2; ++i) {
+        self->target_textures[i] = gl_create_texture(self->params.egl, video_codec_context->width / div[i], video_codec_context->height / div[i], !self->params.hdr ? internal_formats_nv12[i] : internal_formats_p010[i], formats[i]);
+        if(self->target_textures[i] == 0) {
+            fprintf(stderr, "gsr error: gsr_video_encoder_cuda_setup_textures: failed to create opengl texture\n");
+            return false;
+        }
+
+        if(!cuda_register_opengl_texture(&self->cuda, &self->cuda_graphics_resources[i], &self->mapped_arrays[i], self->target_textures[i])) {
+            return false;
+        }
+    }
+
+    return true;
+}
+
+static void gsr_video_encoder_cuda_stop(gsr_video_encoder_cuda *self, AVCodecContext *video_codec_context);
+
+static bool gsr_video_encoder_cuda_start(gsr_video_encoder *encoder, AVCodecContext *video_codec_context, AVFrame *frame) {
+    gsr_video_encoder_cuda *encoder_cuda = encoder->priv;
+
+    // TODO: Force set overclock to false if wayland
+    if(!gsr_cuda_load(&encoder_cuda->cuda, encoder_cuda->params.egl->x11.dpy, encoder_cuda->params.overclock)) {
+        fprintf(stderr, "gsr error: gsr_video_encoder_cuda_start: failed to load cuda\n");
+        gsr_video_encoder_cuda_stop(encoder_cuda, video_codec_context);
+        return false;
+    }
+
+    if(!gsr_video_encoder_cuda_setup_context(encoder_cuda, video_codec_context)) {
+        gsr_video_encoder_cuda_stop(encoder_cuda, video_codec_context);
+        return false;
+    }
+
+    if(!gsr_video_encoder_cuda_setup_textures(encoder_cuda, video_codec_context, frame)) {
+        gsr_video_encoder_cuda_stop(encoder_cuda, video_codec_context);
+        return false;
+    }
+
+    return true;
+}
+
+void gsr_video_encoder_cuda_stop(gsr_video_encoder_cuda *self, AVCodecContext *video_codec_context) {
+    self->params.egl->glDeleteTextures(2, self->target_textures);
+    self->target_textures[0] = 0;
+    self->target_textures[1] = 0;
+
+    if(video_codec_context->hw_device_ctx)
+        av_buffer_unref(&video_codec_context->hw_device_ctx);
+    if(video_codec_context->hw_frames_ctx)
+        av_buffer_unref(&video_codec_context->hw_frames_ctx);
+
+    if(self->cuda.cu_ctx) {
+        for(int i = 0; i < 2; ++i) {
+            if(self->cuda_graphics_resources[i]) {
+                self->cuda.cuGraphicsUnmapResources(1, &self->cuda_graphics_resources[i], 0);
+                self->cuda.cuGraphicsUnregisterResource(self->cuda_graphics_resources[i]);
+                self->cuda_graphics_resources[i] = 0;
+            }
+        }
+    }
+
+    gsr_cuda_unload(&self->cuda);
+}
+
+static void gsr_video_encoder_cuda_copy_textures_to_frame(gsr_video_encoder *encoder, AVFrame *frame) {
+    gsr_video_encoder_cuda *encoder_cuda = encoder->priv;
+    const int div[2] = {1, 2}; // divide UV texture size by 2 because chroma is half size
+    for(int i = 0; i < 2; ++i) {
+        CUDA_MEMCPY2D memcpy_struct;
+        memcpy_struct.srcXInBytes = 0;
+        memcpy_struct.srcY = 0;
+        memcpy_struct.srcMemoryType = CU_MEMORYTYPE_ARRAY;
+
+        memcpy_struct.dstXInBytes = 0;
+        memcpy_struct.dstY = 0;
+        memcpy_struct.dstMemoryType = CU_MEMORYTYPE_DEVICE;
+
+        memcpy_struct.srcArray = encoder_cuda->mapped_arrays[i];
+        memcpy_struct.srcPitch = frame->width / div[i];
+        memcpy_struct.dstDevice = (CUdeviceptr)frame->data[i];
+        memcpy_struct.dstPitch = frame->linesize[i];
+        memcpy_struct.WidthInBytes = frame->width * (encoder_cuda->params.hdr ? 2 : 1);
+        memcpy_struct.Height = frame->height / div[i];
+        // TODO: Remove this copy if possible
+        encoder_cuda->cuda.cuMemcpy2DAsync_v2(&memcpy_struct, encoder_cuda->cuda_stream);
+    }
+
+    // TODO: needed?
+    encoder_cuda->cuda.cuStreamSynchronize(encoder_cuda->cuda_stream);
+}
+
+static void gsr_video_encoder_cuda_get_textures(gsr_video_encoder *encoder, unsigned int *textures, int *num_textures, gsr_destination_color *destination_color) {
+    gsr_video_encoder_cuda *encoder_cuda = encoder->priv;
+    textures[0] = encoder_cuda->target_textures[0];
+    textures[1] = encoder_cuda->target_textures[1];
+    *num_textures = 2;
+    *destination_color = encoder_cuda->params.hdr ? GSR_DESTINATION_COLOR_P010 : GSR_DESTINATION_COLOR_NV12;
+}
+
+static void gsr_video_encoder_cuda_destroy(gsr_video_encoder *encoder, AVCodecContext *video_codec_context) {
+    gsr_video_encoder_cuda_stop(encoder->priv, video_codec_context);
+    free(encoder->priv);
+    free(encoder);
+}
+
+gsr_video_encoder* gsr_video_encoder_cuda_create(const gsr_video_encoder_cuda_params *params) {
+    gsr_video_encoder *encoder = calloc(1, sizeof(gsr_video_encoder));
+    if(!encoder)
+        return NULL;
+
+    gsr_video_encoder_cuda *encoder_cuda = calloc(1, sizeof(gsr_video_encoder_cuda));
+    if(!encoder_cuda) {
+        free(encoder);
+        return NULL;
+    }
+
+    encoder_cuda->params = *params;
+
+    *encoder = (gsr_video_encoder) {
+        .start = gsr_video_encoder_cuda_start,
+        .copy_textures_to_frame = gsr_video_encoder_cuda_copy_textures_to_frame,
+        .get_textures = gsr_video_encoder_cuda_get_textures,
+        .destroy = gsr_video_encoder_cuda_destroy,
+        .priv = encoder_cuda
+    };
+
+    return encoder;
+}