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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_kms.h"
#include <assert.h>
#include <errno.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/timerfd.h>
#include <time.h>
#include <unistd.h>
#include <xf86drm.h>
#include "gpu.h"
#include "toolbox/utils.h"
static const int kCapturePeriod = 1000000000 / 60;
struct CaptureContextKms {
struct GpuContext* gpu_context;
const struct CaptureContextCallbacks* callbacks;
void* user;
int drm_fd;
uint32_t crtc_id;
int timer_fd;
};
static int OpenAnyModule(void) {
static const char* const modules[] = {
"i915",
"amdgpu",
};
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 bool GetCrtcFb(int drm_fd, uint32_t crtc_id,
struct drm_mode_fb_cmd2* drm_mode_fb_cmd2) {
struct drm_mode_crtc drm_mode_crtc = {
.crtc_id = crtc_id,
};
if (drmIoctl(drm_fd, DRM_IOCTL_MODE_GETCRTC, &drm_mode_crtc)) {
LOG("Failed to get crtc %u (%s)", crtc_id, strerror(errno));
return false;
}
if (!drm_mode_crtc.fb_id) {
LOG("Crtc %u has no framebuffer", crtc_id);
return false;
}
struct drm_mode_fb_cmd2 result = {
.fb_id = drm_mode_crtc.fb_id,
};
if (drmIoctl(drm_fd, DRM_IOCTL_MODE_GETFB2, &result)) {
LOG("Failed to get framebuffer %u (%s)", drm_mode_crtc.fb_id,
strerror(errno));
return false;
}
if (!result.handles[0]) {
LOG("Framebuffer %u has no handles", drm_mode_crtc.fb_id);
return false;
}
if (drm_mode_fb_cmd2) *drm_mode_fb_cmd2 = result;
return true;
}
struct CaptureContextKms* CaptureContextKmsCreate(
struct GpuContext* gpu_context,
const struct CaptureContextCallbacks* callbacks, void* user) {
struct CaptureContextKms* capture_context =
malloc(sizeof(struct CaptureContextKms));
if (!capture_context) {
LOG("Failed to allocate capture context (%s)", strerror(errno));
return NULL;
}
*capture_context = (struct CaptureContextKms){
.gpu_context = gpu_context,
.callbacks = callbacks,
.user = user,
.drm_fd = -1,
.timer_fd = -1,
};
capture_context->drm_fd = OpenAnyModule();
if (capture_context->drm_fd == -1) {
LOG("Failed to open any module");
goto rollback_capture_context;
}
uint32_t crtc_ids[16];
struct drm_mode_card_res drm_mode_card_res = {
.crtc_id_ptr = (uintptr_t)crtc_ids,
.count_crtcs = LENGTH(crtc_ids),
};
if (drmIoctl(capture_context->drm_fd, DRM_IOCTL_MODE_GETRESOURCES,
&drm_mode_card_res)) {
LOG("Failed to get drm mode resources (%s)", strerror(errno));
goto rollback_drm_fd;
}
for (size_t i = 0; i < drm_mode_card_res.count_crtcs; i++) {
if (GetCrtcFb(capture_context->drm_fd, crtc_ids[i], NULL)) {
LOG("Capturing crtc %u", crtc_ids[i]);
capture_context->crtc_id = crtc_ids[i];
break;
}
}
if (!capture_context->crtc_id) {
LOG("Nothing to capture");
goto rollback_drm_fd;
}
capture_context->timer_fd = timerfd_create(CLOCK_MONOTONIC, 0);
if (capture_context->timer_fd == -1) {
LOG("Failed to create timer (%s)", strerror(errno));
goto rollback_drm_fd;
}
static const struct itimerspec kTimerSpec = {
.it_interval.tv_nsec = kCapturePeriod,
.it_value.tv_nsec = kCapturePeriod,
};
if (timerfd_settime(capture_context->timer_fd, 0, &kTimerSpec, NULL)) {
LOG("Failed to arm timer (%s)", strerror(errno));
goto rollback_timer_fd;
}
return capture_context;
rollback_timer_fd:
close(capture_context->timer_fd);
rollback_drm_fd:
drmClose(capture_context->drm_fd);
rollback_capture_context:
free(capture_context);
return NULL;
}
int CaptureContextKmsGetEventsFd(struct CaptureContextKms* capture_context) {
return capture_context->timer_fd;
}
bool CaptureContextKmsProcessEvents(struct CaptureContextKms* capture_context) {
uint64_t expirations;
if (read(capture_context->timer_fd, &expirations, sizeof(expirations)) !=
sizeof(expirations)) {
LOG("Failed to read timer expirations (%s)", strerror(errno));
return false;
}
struct drm_mode_fb_cmd2 drm_mode_fb_cmd2;
if (!GetCrtcFb(capture_context->drm_fd, capture_context->crtc_id,
&drm_mode_fb_cmd2)) {
return false;
}
struct GpuFramePlane planes[] = {
{.dmabuf_fd = -1},
{.dmabuf_fd = -1},
{.dmabuf_fd = -1},
{.dmabuf_fd = -1},
};
static_assert(LENGTH(planes) == LENGTH(drm_mode_fb_cmd2.handles),
"Suspicious drm_mode_fb_cmd2 structure");
size_t nplanes = 0;
for (; nplanes < LENGTH(planes); nplanes++) {
if (!drm_mode_fb_cmd2.handles[nplanes]) break;
int status = drmPrimeHandleToFD(capture_context->drm_fd,
drm_mode_fb_cmd2.handles[nplanes], 0,
&planes[nplanes].dmabuf_fd);
if (status) {
LOG("Failed to get dmabuf fd (%d)", status);
goto release_planes;
}
planes[nplanes].offset = drm_mode_fb_cmd2.offsets[nplanes];
planes[nplanes].pitch = drm_mode_fb_cmd2.pitches[nplanes];
planes[nplanes].modifier = drm_mode_fb_cmd2.modifier[nplanes];
}
struct GpuFrame* gpu_frame = GpuContextCreateFrame(
capture_context->gpu_context, drm_mode_fb_cmd2.width,
drm_mode_fb_cmd2.height, drm_mode_fb_cmd2.pixel_format, nplanes, planes);
if (!gpu_frame) {
LOG("Failed to create gpu frame");
goto release_planes;
}
// mburakov: Capture context might get destroyed in callback.
struct GpuContext* gpu_context = capture_context->gpu_context;
capture_context->callbacks->OnFrameReady(capture_context->user, gpu_frame);
GpuContextDestroyFrame(gpu_context, gpu_frame);
return true;
release_planes:
CloseUniqueFds((int[]){planes[0].dmabuf_fd, planes[1].dmabuf_fd,
planes[2].dmabuf_fd, planes[3].dmabuf_fd});
return false;
}
void CaptureContextKmsDestroy(struct CaptureContextKms* capture_context) {
close(capture_context->timer_fd);
drmClose(capture_context->drm_fd);
free(capture_context);
}
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