A GTK3 camera application that knows how to deal with the media request api
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#include "camera.h"
#include <assert.h>
#include <errno.h>
#include <glib.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#define MAX_VIDEO_BUFFERS 20
static const char *pixel_format_names[MP_PIXEL_FMT_MAX] = {
"unsupported",
"BGGR8",
"GBRG8",
"GRBG8",
"RGGB8",
};
const char *mp_pixel_format_to_str(uint32_t pixel_format)
{
g_return_val_if_fail(pixel_format < MP_PIXEL_FMT_MAX, "INVALID");
return pixel_format_names[pixel_format];
}
MPPixelFormat mp_pixel_format_from_str(const char *name)
{
for (MPPixelFormat i = 0; i < MP_PIXEL_FMT_MAX; ++i) {
if (strcasecmp(pixel_format_names[i], name) == 0) {
return i;
}
}
g_return_val_if_reached(MP_PIXEL_FMT_UNSUPPORTED);
}
static const uint32_t pixel_format_v4l_pixel_formats[MP_PIXEL_FMT_MAX] = {
0,
V4L2_PIX_FMT_SBGGR8,
V4L2_PIX_FMT_SGBRG8,
V4L2_PIX_FMT_SGRBG8,
V4L2_PIX_FMT_SRGGB8,
};
uint32_t mp_pixel_format_to_v4l_pixel_format(MPPixelFormat pixel_format)
{
g_return_val_if_fail(pixel_format < MP_PIXEL_FMT_MAX, 0);
return pixel_format_v4l_pixel_formats[pixel_format];
}
MPPixelFormat mp_pixel_format_from_v4l_pixel_format(uint32_t v4l_pixel_format)
{
for (MPPixelFormat i = 0; i < MP_PIXEL_FMT_MAX; ++i) {
if (pixel_format_v4l_pixel_formats[i] == v4l_pixel_format) {
return i;
}
}
return MP_PIXEL_FMT_UNSUPPORTED;
}
static const uint32_t pixel_format_v4l_bus_codes[MP_PIXEL_FMT_MAX] = {
0,
MEDIA_BUS_FMT_SBGGR8_1X8,
MEDIA_BUS_FMT_SGBRG8_1X8,
MEDIA_BUS_FMT_SGRBG8_1X8,
MEDIA_BUS_FMT_SRGGB8_1X8,
};
uint32_t mp_pixel_format_to_v4l_bus_code(MPPixelFormat pixel_format)
{
g_return_val_if_fail(pixel_format < MP_PIXEL_FMT_MAX, 0);
return pixel_format_v4l_bus_codes[pixel_format];
}
MPPixelFormat mp_pixel_format_from_v4l_bus_code(uint32_t v4l_bus_code)
{
for (MPPixelFormat i = 0; i < MP_PIXEL_FMT_MAX; ++i) {
if (pixel_format_v4l_bus_codes[i] == v4l_bus_code) {
return i;
}
}
return MP_PIXEL_FMT_UNSUPPORTED;
}
uint32_t mp_pixel_format_bytes_per_pixel(MPPixelFormat pixel_format)
{
g_return_val_if_fail(pixel_format < MP_PIXEL_FMT_MAX, 0);
switch (pixel_format) {
case MP_PIXEL_FMT_BGGR8:
case MP_PIXEL_FMT_GBRG8:
case MP_PIXEL_FMT_GRBG8:
case MP_PIXEL_FMT_RGGB8: return 1;
default: return 0;
}
}
bool mp_camera_mode_is_equivalent(const MPCameraMode *m1, const MPCameraMode *m2)
{
return m1->pixel_format == m2->pixel_format
&& m1->frame_interval.numerator == m2->frame_interval.numerator
&& m1->frame_interval.denominator == m2->frame_interval.denominator
&& m1->width == m2->width
&& m1->height == m2->height;
}
struct video_buffer {
uint32_t length;
uint8_t *data;
};
struct _MPCamera {
int video_fd;
int subdev_fd;
bool has_set_mode;
MPCameraMode current_mode;
struct video_buffer buffers[MAX_VIDEO_BUFFERS];
uint32_t num_buffers;
};
MPCamera *mp_camera_new(int video_fd, int subdev_fd)
{
g_return_val_if_fail(video_fd != -1, NULL);
MPCamera *camera = malloc(sizeof(MPCamera));
camera->video_fd = video_fd;
camera->subdev_fd = subdev_fd;
camera->has_set_mode = false;
camera->num_buffers = 0;
return camera;
}
void mp_camera_free(MPCamera *camera)
{
g_warn_if_fail(camera->num_buffers == 0);
if (camera->num_buffers != 0) {
mp_camera_stop_capture(camera);
}
free(camera);
}
bool mp_camera_is_subdev(MPCamera *camera)
{
return camera->subdev_fd != -1;
}
int mp_camera_get_video_fd(MPCamera *camera)
{
return camera->video_fd;
}
int mp_camera_get_subdev_fd(MPCamera *camera)
{
return camera->subdev_fd;
}
static void errno_printerr(const char *s)
{
g_printerr("MPCamera: %s error %d, %s\n", s, errno, strerror(errno));
}
static int xioctl(int fd, int request, void *arg)
{
int r;
do {
r = ioctl(fd, request, arg);
} while (r == -1 && errno == EINTR);
return r;
}
bool mp_camera_try_mode(MPCamera *camera, MPCameraMode *mode)
{
struct v4l2_format fmt = {};
fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
fmt.fmt.pix.width = mode->width;
fmt.fmt.pix.height = mode->height;
fmt.fmt.pix.pixelformat = mp_pixel_format_from_v4l_pixel_format(mode->pixel_format);
fmt.fmt.pix.field = V4L2_FIELD_ANY;
if (xioctl(camera->video_fd, VIDIOC_TRY_FMT, &fmt) == -1) {
errno_printerr("VIDIOC_S_FMT");
return false;
}
mode->width = fmt.fmt.pix.width;
mode->height = fmt.fmt.pix.height;
mode->pixel_format = mp_pixel_format_from_v4l_pixel_format(fmt.fmt.pix.pixelformat);
return true;
}
const MPCameraMode *mp_camera_get_mode(const MPCamera *camera)
{
return &camera->current_mode;
}
bool mp_camera_set_mode(MPCamera *camera, MPCameraMode *mode)
{
// Set the mode in the subdev the camera is one
if (mp_camera_is_subdev(camera))
{
struct v4l2_subdev_frame_interval interval = {};
interval.pad = 0;
interval.interval = mode->frame_interval;
if (xioctl(camera->subdev_fd, VIDIOC_SUBDEV_S_FRAME_INTERVAL, &interval) == -1) {
errno_printerr("VIDIOC_SUBDEV_S_FRAME_INTERVAL");
return false;
}
bool did_set_frame_rate =
interval.interval.numerator == mode->frame_interval.numerator
&& interval.interval.denominator == mode->frame_interval.denominator;
struct v4l2_subdev_format fmt = {};
fmt.pad = 0;
fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
fmt.format.width = mode->width;
fmt.format.height = mode->height;
fmt.format.code = mp_pixel_format_to_v4l_bus_code(mode->pixel_format);
fmt.format.field = V4L2_FIELD_ANY;
if (xioctl(camera->subdev_fd, VIDIOC_SUBDEV_S_FMT, &fmt) == -1) {
errno_printerr("VIDIOC_SUBDEV_S_FMT");
return false;
}
// Some drivers like ov5640 don't allow you to set the frame format with
// too high a frame-rate, but that means the frame-rate won't be set
// after the format change. So we need to try again here if we didn't
// succeed before. Ideally we'd be able to set both at once.
if (!did_set_frame_rate)
{
interval.interval = mode->frame_interval;
if (xioctl(camera->subdev_fd, VIDIOC_SUBDEV_S_FRAME_INTERVAL, &interval) == -1) {
errno_printerr("VIDIOC_SUBDEV_S_FRAME_INTERVAL");
return false;
}
}
// Update the mode
mode->pixel_format = mp_pixel_format_from_v4l_bus_code(fmt.format.code);
mode->frame_interval = interval.interval;
mode->width = fmt.format.width;
mode->height = fmt.format.height;
}
// Set the mode for the video device
{
struct v4l2_format fmt = {};
fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
fmt.fmt.pix.width = mode->width;
fmt.fmt.pix.height = mode->height;
fmt.fmt.pix.pixelformat = mp_pixel_format_to_v4l_pixel_format(mode->pixel_format);
fmt.fmt.pix.field = V4L2_FIELD_ANY;
if (xioctl(camera->video_fd, VIDIOC_S_FMT, &fmt) == -1) {
errno_printerr("VIDIOC_S_FMT");
return false;
}
// Update the mode
mode->pixel_format = mp_pixel_format_from_v4l_pixel_format(fmt.fmt.pix.pixelformat);
mode->width = fmt.fmt.pix.width;
mode->height = fmt.fmt.pix.height;
}
camera->has_set_mode = true;
camera->current_mode = *mode;
return true;
}
bool mp_camera_start_capture(MPCamera *camera)
{
g_return_val_if_fail(camera->has_set_mode, false);
g_return_val_if_fail(camera->num_buffers == 0, false);
// Start by requesting buffers
struct v4l2_requestbuffers req = {};
req.count = MAX_VIDEO_BUFFERS;
req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
req.memory = V4L2_MEMORY_MMAP;
if (xioctl(camera->video_fd, VIDIOC_REQBUFS, &req) == -1) {
errno_printerr("VIDIOC_REQBUFS");
return false;
}
if (req.count < 2) {
g_printerr("Insufficient buffer memory. Only %d buffers available.\n",
req.count);
goto error;
}
for (uint32_t i = 0; i < req.count; ++i) {
// Query each buffer and mmap it
struct v4l2_buffer buf = {
.type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
.memory = V4L2_MEMORY_MMAP,
.index = i,
};
if (xioctl(camera->video_fd, VIDIOC_QUERYBUF, &buf) == -1) {
errno_printerr("VIDIOC_QUERYBUF");
break;
}
camera->buffers[i].length = buf.length;
camera->buffers[i].data = mmap(
NULL,
buf.length,
PROT_READ,
MAP_SHARED,
camera->video_fd,
buf.m.offset);
if (camera->buffers[i].data == MAP_FAILED) {
errno_printerr("mmap");
break;
}
++camera->num_buffers;
}
if (camera->num_buffers != req.count) {
g_printerr("Unable to map all buffers\n");
goto error;
}
for (uint32_t i = 0; i < camera->num_buffers; ++i) {
struct v4l2_buffer buf = {
.type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
.memory = V4L2_MEMORY_MMAP,
.index = i,
};
// Queue the buffer for capture
if (xioctl(camera->video_fd, VIDIOC_QBUF, &buf) == -1) {
errno_printerr("VIDIOC_QBUF");
goto error;
}
}
// Start capture
enum v4l2_buf_type type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if (xioctl(camera->video_fd, VIDIOC_STREAMON, &type) == -1) {
errno_printerr("VIDIOC_STREAMON");
goto error;
}
return true;
error:
// Unmap any mapped buffers
assert(camera->num_buffers <= MAX_VIDEO_BUFFERS);
for (uint32_t i = 0; i < camera->num_buffers; ++i) {
if (munmap(camera->buffers[i].data, camera->buffers[i].length) == -1) {
errno_printerr("munmap");
}
}
// Reset allocated buffers
{
struct v4l2_requestbuffers req = {};
req.count = 0;
req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
req.memory = V4L2_MEMORY_MMAP;
if (xioctl(camera->video_fd, VIDIOC_REQBUFS, &req) == -1) {
errno_printerr("VIDIOC_REQBUFS");
}
}
return false;
}
bool mp_camera_stop_capture(MPCamera *camera)
{
g_return_val_if_fail(camera->num_buffers > 0, false);
enum v4l2_buf_type type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if (xioctl(camera->video_fd, VIDIOC_STREAMOFF, &type) == -1) {
errno_printerr("VIDIOC_STREAMOFF");
}
assert(camera->num_buffers <= MAX_VIDEO_BUFFERS);
for (int i = 0; i < camera->num_buffers; ++i) {
if (munmap(camera->buffers[i].data, camera->buffers[i].length) == -1) {
errno_printerr("munmap");
}
}
camera->num_buffers = 0;
struct v4l2_requestbuffers req = {};
req.count = 0;
req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
req.memory = V4L2_MEMORY_MMAP;
if (xioctl(camera->video_fd, VIDIOC_REQBUFS, &req) == -1) {
errno_printerr("VIDIOC_REQBUFS");
}
return true;
}
bool mp_camera_is_capturing(MPCamera *camera)
{
return camera->num_buffers > 0;
}
bool mp_camera_capture_image(MPCamera *camera, void (*callback)(MPImage, void *), void *user_data)
{
struct v4l2_buffer buf = {};
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
if (xioctl(camera->video_fd, VIDIOC_DQBUF, &buf) == -1) {
switch (errno) {
case EAGAIN:
return true;
case EIO:
/* Could ignore EIO, see spec. */
/* fallthrough */
default:
errno_printerr("VIDIOC_DQBUF");
return false;
}
}
uint32_t pixel_format = camera->current_mode.pixel_format;
uint32_t width = camera->current_mode.width;
uint32_t height = camera->current_mode.height;
assert(buf.bytesused == mp_pixel_format_bytes_per_pixel(pixel_format) * width * height);
assert(buf.bytesused == camera->buffers[buf.index].length);
MPImage image = {
.pixel_format = pixel_format,
.width = width,
.height = height,
.data = camera->buffers[buf.index].data,
};
callback(image, user_data);
// The callback may have stopped the capture, only queue the buffer if we're
// still capturing.
if (mp_camera_is_capturing(camera)) {
if (xioctl(camera->video_fd, VIDIOC_QBUF, &buf) == -1) {
errno_printerr("VIDIOC_QBUF");
return false;
}
}
return true;
}
struct _MPCameraModeList {
MPCameraMode mode;
MPCameraModeList *next;
};
static MPCameraModeList *
get_subdev_modes(MPCamera *camera, bool (*check)(MPCamera *, MPCameraMode *))
{
MPCameraModeList *item = NULL;
for (uint32_t fmt_index = 0;; ++fmt_index) {
struct v4l2_subdev_mbus_code_enum fmt = {};
fmt.index = fmt_index;
fmt.pad = 0;
fmt.which = V4L2_SUBDEV_FORMAT_TRY;
if (xioctl(camera->subdev_fd, VIDIOC_SUBDEV_ENUM_MBUS_CODE, &fmt) == -1) {
if (errno != EINVAL) {
errno_printerr("VIDIOC_SUBDEV_ENUM_MBUS_CODE");
}
break;
}
// Skip unsupported formats
uint32_t format = mp_pixel_format_from_v4l_bus_code(fmt.code);
if (format == MP_PIXEL_FMT_UNSUPPORTED) {
continue;
}
for (uint32_t frame_index = 0;; ++frame_index) {
struct v4l2_subdev_frame_size_enum frame = {};
frame.index = frame_index;
frame.pad = 0;
frame.code = fmt.code;
frame.which = V4L2_SUBDEV_FORMAT_TRY;
if (xioctl(camera->subdev_fd, VIDIOC_SUBDEV_ENUM_FRAME_SIZE, &frame) == -1) {
if (errno != EINVAL) {
errno_printerr("VIDIOC_SUBDEV_ENUM_FRAME_SIZE");
}
break;
}
// TODO: Handle other types
if (frame.min_width != frame.max_width
|| frame.min_height != frame.max_height) {
break;
}
for (uint32_t interval_index = 0;; ++interval_index) {
struct v4l2_subdev_frame_interval_enum interval = {};
interval.index = interval_index;
interval.pad = 0;
interval.code = fmt.code;
interval.width = frame.max_width;
interval.height = frame.max_height;
interval.which = V4L2_SUBDEV_FORMAT_TRY;
if (xioctl(camera->subdev_fd, VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL, &interval) == -1) {
if (errno != EINVAL) {
errno_printerr("VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL");
}
break;
}
MPCameraMode mode = {
.pixel_format = format,
.frame_interval = interval.interval,
.width = frame.max_width,
.height = frame.max_height,
};
if (!check(camera, &mode)) {
continue;
}
MPCameraModeList *new_item = malloc(sizeof(MPCameraModeList));
new_item->mode = mode;
new_item->next = item;
item = new_item;
}
}
}
return item;
}
static MPCameraModeList *
get_video_modes(MPCamera *camera, bool (*check)(MPCamera *, MPCameraMode *))
{
MPCameraModeList *item = NULL;
for (uint32_t fmt_index = 0;; ++fmt_index) {
struct v4l2_fmtdesc fmt = {};
fmt.index = fmt_index;
fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if (xioctl(camera->video_fd, VIDIOC_ENUM_FMT, &fmt) == -1) {
if (errno != EINVAL) {
errno_printerr("VIDIOC_ENUM_FMT");
}
break;
}
// Skip unsupported formats
uint32_t format = mp_pixel_format_from_v4l_pixel_format(fmt.pixelformat);
if (format == MP_PIXEL_FMT_UNSUPPORTED) {
continue;
}
for (uint32_t frame_index = 0;; ++frame_index) {
struct v4l2_frmsizeenum frame = {};
frame.index = frame_index;
frame.pixel_format = fmt.pixelformat;
if (xioctl(camera->video_fd, VIDIOC_ENUM_FRAMESIZES, &frame) == -1) {
if (errno != EINVAL) {
errno_printerr("VIDIOC_ENUM_FRAMESIZES");
}
break;
}
// TODO: Handle other types
if (frame.type != V4L2_FRMSIZE_TYPE_DISCRETE) {
break;
}
for (uint32_t interval_index = 0;; ++interval_index) {
struct v4l2_frmivalenum interval = {};
interval.index = interval_index;
interval.pixel_format = fmt.pixelformat;
interval.width = frame.discrete.width;
interval.height = frame.discrete.height;
if (xioctl(camera->video_fd, VIDIOC_ENUM_FRAMEINTERVALS, &interval) == -1) {
if (errno != EINVAL) {
errno_printerr("VIDIOC_ENUM_FRAMESIZES");
}
break;
}
// TODO: Handle other types
if (interval.type != V4L2_FRMIVAL_TYPE_DISCRETE) {
break;
}
MPCameraMode mode = {
.pixel_format = format,
.frame_interval = interval.discrete,
.width = frame.discrete.width,
.height = frame.discrete.height,
};
if (!check(camera, &mode)) {
continue;
}
MPCameraModeList *new_item = malloc(sizeof(MPCameraModeList));
new_item->mode = mode;
new_item->next = item;
item = new_item;
}
}
}
return item;
}
static bool all_modes(MPCamera *camera, MPCameraMode *mode)
{
return true;
}
static bool available_modes(MPCamera *camera, MPCameraMode *mode)
{
MPCameraMode attempt = *mode;
return mp_camera_try_mode(camera, &attempt)
&& mp_camera_mode_is_equivalent(mode, &attempt);
}
MPCameraModeList *mp_camera_list_supported_modes(MPCamera *camera)
{
if (mp_camera_is_subdev(camera)) {
return get_subdev_modes(camera, all_modes);
} else {
return get_video_modes(camera, all_modes);
}
}
MPCameraModeList *mp_camera_list_available_modes(MPCamera *camera)
{
if (mp_camera_is_subdev(camera)) {
return get_subdev_modes(camera, available_modes);
} else {
return get_video_modes(camera, available_modes);
}
}
MPCameraMode *mp_camera_mode_list_get(MPCameraModeList *list)
{
g_return_val_if_fail(list, NULL);
return &list->mode;
}
MPCameraModeList *mp_camera_mode_list_next(MPCameraModeList *list)
{
g_return_val_if_fail(list, NULL);
return list->next;
}
void mp_camera_mode_list_free(MPCameraModeList *list)
{
while (list) {
MPCameraModeList *tmp = list;
list = tmp->next;
free(tmp);
}
}