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trying to work with v4l2 loopback but not implemented

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klemek
2025-09-21 23:51:37 +02:00
parent 616b2af44b
commit ed4e3e54d6
2 changed files with 22 additions and 9 deletions
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src/types.h
+1
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@@ -92,6 +92,7 @@ typedef struct VideoDevice {
unsigned int height; unsigned int height;
unsigned int pixelformat; unsigned int pixelformat;
unsigned int bytesperline; unsigned int bytesperline;
bool output;
struct v4l2_buffer buf; struct v4l2_buffer buf;
EGLImageKHR dma_image; EGLImageKHR dma_image;
} VideoDevice; } VideoDevice;
src/video.c
+20 -8
View File
@@ -94,6 +94,8 @@ static bool set_device_format(VideoDevice *device, unsigned int preferred_width,
unsigned int preferred_height) { unsigned int preferred_height) {
struct v4l2_format fmt; struct v4l2_format fmt;
device->output = false;
memset(&fmt, 0, sizeof(fmt)); memset(&fmt, 0, sizeof(fmt));
fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
@@ -103,9 +105,16 @@ static bool set_device_format(VideoDevice *device, unsigned int preferred_width,
fmt.fmt.pix.field = V4L2_FIELD_INTERLACED; fmt.fmt.pix.field = V4L2_FIELD_INTERLACED;
if (ioctl(device->fd, VIDIOC_S_FMT, &fmt) == -1) { if (ioctl(device->fd, VIDIOC_S_FMT, &fmt) == -1) {
ioctl_error(device, "VIDIOC_S_FMT", "Requested buffer type not supported"); fmt.type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
device->output = true;
if (ioctl(device->fd, VIDIOC_S_FMT, &fmt) == -1) {
ioctl_error(device, "VIDIOC_S_FMT",
"Requested buffer type not supported");
return false; return false;
} }
}
device->width = fmt.fmt.pix.width; device->width = fmt.fmt.pix.width;
device->height = fmt.fmt.pix.height; device->height = fmt.fmt.pix.height;
@@ -126,7 +135,8 @@ static bool request_buffers(VideoDevice *device) {
memset(&reqbuf, 0, sizeof(reqbuf)); memset(&reqbuf, 0, sizeof(reqbuf));
reqbuf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; reqbuf.type =
device->output ? V4L2_BUF_TYPE_VIDEO_OUTPUT : V4L2_BUF_TYPE_VIDEO_CAPTURE;
reqbuf.memory = V4L2_MEMORY_MMAP; reqbuf.memory = V4L2_MEMORY_MMAP;
reqbuf.count = 1; reqbuf.count = 1;
@@ -148,8 +158,9 @@ static bool export_buffer(VideoDevice *device) {
memset(&expbuf, 0, sizeof(expbuf)); memset(&expbuf, 0, sizeof(expbuf));
expbuf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; expbuf.type =
expbuf.index = 0; /// '0' for one buffer device->output ? V4L2_BUF_TYPE_VIDEO_OUTPUT : V4L2_BUF_TYPE_VIDEO_CAPTURE;
expbuf.index = 0;
expbuf.flags = O_RDONLY; expbuf.flags = O_RDONLY;
if (ioctl(device->fd, VIDIOC_EXPBUF, &expbuf) == -1) { if (ioctl(device->fd, VIDIOC_EXPBUF, &expbuf) == -1) {
@@ -180,7 +191,8 @@ static bool open_stream(VideoDevice *device) {
static void create_image_buffer(VideoDevice *device) { static void create_image_buffer(VideoDevice *device) {
memset(&device->buf, 0, sizeof(device->buf)); memset(&device->buf, 0, sizeof(device->buf));
device->buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; device->buf.type =
device->output ? V4L2_BUF_TYPE_VIDEO_OUTPUT : V4L2_BUF_TYPE_VIDEO_CAPTURE;
device->buf.memory = V4L2_MEMORY_MMAP; device->buf.memory = V4L2_MEMORY_MMAP;
device->buf.index = 0; device->buf.index = 0;
@@ -209,9 +221,9 @@ VideoDevice video_init(char *name, unsigned int preferred_width,
return device; return device;
} }
// if (!request_buffers(&device)) { if (!request_buffers(&device)) {
// return device; return device;
// } }
if (!export_buffer(&device)) { if (!export_buffer(&device)) {
return device; return device;