1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
|
/*
* 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 {
struct GpuContext* gpu_context;
int drm_fd;
uint32_t crtc_id;
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 bool IsCrtcComplete(int drm_fd, uint32_t crtc_id) {
drmModeCrtcPtr crtc = drmModeGetCrtc(drm_fd, crtc_id);
if (!crtc) {
LOG("Failed to get crtc %u (%s)", crtc_id, strerror(errno));
return false;
}
bool result = false;
if (!crtc->buffer_id) {
LOG("Crtc %u has no framebuffer", crtc_id);
goto rollback_crtc;
}
drmModeFB2Ptr fb2 = drmModeGetFB2(drm_fd, crtc->buffer_id);
if (!fb2) {
LOG("Failed to get framebuffer %u (%s)", crtc->buffer_id, strerror(errno));
goto rollback_crtc;
}
if (!fb2->handles[0]) {
LOG("Framebuffer %u has no handles", crtc->buffer_id);
goto rollback_fb2;
}
result = true;
rollback_fb2:
drmModeFreeFB2(fb2);
rollback_crtc:
drmModeFreeCrtc(crtc);
return result;
}
struct CaptureContext* CaptureContextCreate(struct GpuContext* gpu_context) {
struct 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){
.gpu_context = gpu_context,
.drm_fd = -1,
};
capture_context->drm_fd = OpenAnyModule();
if (capture_context->drm_fd == -1) {
LOG("Failed to open any module");
goto rollback_capture_context;
}
drmModeResPtr res = drmModeGetResources(capture_context->drm_fd);
if (!res) {
LOG("Failed to get drm mode resources (%s)", strerror(errno));
goto rollback_drm_fd;
}
for (int i = 0; i < res->count_crtcs; i++) {
if (IsCrtcComplete(capture_context->drm_fd, res->crtcs[i])) {
LOG("Capturing crtc %u", res->crtcs[i]);
capture_context->crtc_id = res->crtcs[i];
drmModeFreeResources(res);
return capture_context;
}
}
LOG("Nothing to capture");
drmModeFreeResources(res);
rollback_drm_fd:
drmClose(capture_context->drm_fd);
rollback_capture_context:
free(capture_context);
return NULL;
}
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;
}
const struct GpuFrame* CaptureContextGetFrame(
struct CaptureContext* capture_context) {
drmModeCrtcPtr crtc =
drmModeGetCrtc(capture_context->drm_fd, capture_context->crtc_id);
if (!crtc) {
LOG("Failed to get crtc %u", capture_context->crtc_id);
return NULL;
}
struct GpuFrame* gpu_frame = NULL;
drmModeFB2Ptr fb2 = drmModeGetFB2(capture_context->drm_fd, crtc->buffer_id);
if (!fb2) {
LOG("Failed to get framebuffer %u", crtc->buffer_id);
goto rollback_crtc;
}
if (!fb2->handles[0]) {
LOG("Framebuffer %u has no handles", crtc->buffer_id);
goto rollback_fb2;
}
if (capture_context->gpu_frame) GpuFrameDestroy(capture_context->gpu_frame);
capture_context->gpu_frame = WrapFramebuffer(capture_context->drm_fd, fb2,
capture_context->gpu_context);
gpu_frame = capture_context->gpu_frame;
rollback_fb2:
drmModeFreeFB2(fb2);
rollback_crtc:
drmModeFreeCrtc(crtc);
return gpu_frame;
}
void CaptureContextDestroy(struct CaptureContext* capture_context) {
GpuFrameDestroy(capture_context->gpu_frame);
drmClose(capture_context->drm_fd);
free(capture_context);
}
|
