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/*
* Copyright (C) 2023 Mikhail Burakov. This file is part of streamer.
*
* streamer is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* streamer 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with streamer. If not, see <https://www.gnu.org/licenses/>.
*/
#include "capture.h"
#include <errno.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <xf86drm.h>
#include <xf86drmMode.h>
#include "gpu.h"
#include "util.h"
struct CaptureContext {
int drm_fd;
struct GpuFrame* gpu_frame;
};
static int OpenAnyModule(void) {
static const char* const modules[] = {
"i915", "amdgpu", "radeon", "nouveau", "vmwgfx",
"omapdrm", "exynos", "tilcdc", "msm", "sti",
"tegra", "imx-drm", "rockchip", "atmel-hlcdc", "fsl-dcu-drm",
"vc4", "virtio_gpu", "mediatek", "meson", "pl111",
"stm", "sun4i-drm", "armada-drm", "komeda", "imx-dcss",
"mxsfb-drm", "simpledrm", "imx-lcdif", "vkms",
};
for (size_t i = 0; i < LENGTH(modules); i++) {
int drm_fd = drmOpen(modules[i], NULL);
if (drm_fd >= 0) return drm_fd;
LOG("Failed to open %s (%s)", modules[i], strerror(errno));
}
return -1;
}
static void drmModeResPtrDestroy(drmModeResPtr* res) {
if (res && *res) drmModeFreeResources(*res);
}
static void drmModeCrtcPtrDestroy(drmModeCrtcPtr* crtc) {
if (crtc && *crtc) drmModeFreeCrtc(*crtc);
}
static void drmModeFB2PtrDestroy(drmModeFB2Ptr* fb2) {
if (fb2 && *fb2) drmModeFreeFB2(*fb2);
}
static struct GpuFrame* WrapFramebuffer(int drm_fd, drmModeFB2Ptr fb2,
struct GpuContext* gpu_context) {
size_t nplanes = 0;
struct GpuFrame* result = NULL;
struct GpuFramePlane planes[LENGTH(fb2->handles)];
for (; nplanes < LENGTH(planes) && fb2->handles[nplanes]; nplanes++) {
int status = drmPrimeHandleToFD(drm_fd, fb2->handles[nplanes], 0,
&planes[nplanes].dmabuf_fd);
if (status) {
LOG("Failed to get dmabuf fd (%d)", status);
goto release_planes;
}
planes[nplanes].offset = fb2->offsets[nplanes];
planes[nplanes].pitch = fb2->pitches[nplanes];
// TODO(mburakov): Structure of drmModeFB2 implies that all the planes have
// the same modifier. At the same time, surrounding code supports per-plane
// modifiers. So right now a drmModeFB2-wide modifier is just copypasted
// into each plane descriptor.
planes[nplanes].modifier = fb2->modifier;
}
result = GpuFrameCreate(gpu_context, fb2->width, fb2->height,
fb2->pixel_format, nplanes, planes);
if (!result) LOG("Failed to create gpu frame");
release_planes:
for (; nplanes; nplanes--) close(planes[nplanes - 1].dmabuf_fd);
return result;
}
static struct GpuFrame* GrabCrtc(int drm_fd, uint32_t crtc_id,
struct GpuContext* gpu_context) {
AUTO(drmModeCrtcPtr) crtc = drmModeGetCrtc(drm_fd, crtc_id);
if (!crtc) {
LOG("Failed to get crtc %u", crtc_id);
return NULL;
}
if (!crtc->buffer_id) {
LOG("Crtc %u has no framebuffer", crtc_id);
return NULL;
}
AUTO(drmModeFB2Ptr) fb2 = drmModeGetFB2(drm_fd, crtc->buffer_id);
if (!fb2) {
LOG("Failed to get framebuffer %u", crtc->buffer_id);
return NULL;
}
if (!fb2->handles[0]) {
LOG("Framebuffer %u has no handles", crtc->buffer_id);
return NULL;
}
LOG("Capturing framebuffer %u on crtc %u", crtc->buffer_id, crtc_id);
return WrapFramebuffer(drm_fd, fb2, gpu_context);
}
struct CaptureContext* CaptureContextCreate(struct GpuContext* gpu_context) {
struct AUTO(CaptureContext)* capture_context =
malloc(sizeof(struct CaptureContext));
if (!capture_context) {
LOG("Failed to allocate capture context (%s)", strerror(errno));
return NULL;
}
*capture_context = (struct CaptureContext){
.drm_fd = -1,
.gpu_frame = NULL,
};
capture_context->drm_fd = OpenAnyModule();
if (capture_context->drm_fd == -1) return NULL;
AUTO(drmModeResPtr) res = drmModeGetResources(capture_context->drm_fd);
if (!res) {
LOG("Failed to get drm mode resources (%s)", strerror(errno));
return NULL;
}
for (int i = 0; i < res->count_crtcs; i++) {
capture_context->gpu_frame =
GrabCrtc(capture_context->drm_fd, res->crtcs[i], gpu_context);
if (capture_context->gpu_frame) return RELEASE(capture_context);
}
LOG("Nothing to capture");
return NULL;
}
const struct GpuFrame* CaptureContextGetFrame(
struct CaptureContext* capture_context) {
// TODO(mburakov): Verify nothing changed since last frame
return capture_context->gpu_frame;
}
void CaptureContextDestroy(struct CaptureContext** capture_context) {
if (!capture_context || !*capture_context) return;
if ((*capture_context)->gpu_frame)
GpuFrameDestroy(&(*capture_context)->gpu_frame);
if ((*capture_context)->drm_fd != -1) drmClose((*capture_context)->drm_fd);
free(*capture_context);
capture_context = NULL;
}
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