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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2020, Collabora Ltd.
* Author: Nicolas Dufresne <nicolas.dufresne@collabora.com>
*
* gstlibcamera-utils.c - GStreamer libcamera Utility Function
*/
#include "gstlibcamera-utils.h"
#include <libcamera/formats.h>
using namespace libcamera;
static struct {
GstVideoFormat gst_format;
PixelFormat format;
} format_map[] = {
/* Compressed */
{ GST_VIDEO_FORMAT_ENCODED, formats::MJPEG },
/* RGB */
{ GST_VIDEO_FORMAT_RGB, formats::BGR888 },
{ GST_VIDEO_FORMAT_BGR, formats::RGB888 },
{ GST_VIDEO_FORMAT_ARGB, formats::BGRA8888 },
/* YUV Semiplanar */
{ GST_VIDEO_FORMAT_NV12, formats::NV12 },
{ GST_VIDEO_FORMAT_NV21, formats::NV21 },
{ GST_VIDEO_FORMAT_NV16, formats::NV16 },
{ GST_VIDEO_FORMAT_NV61, formats::NV61 },
{ GST_VIDEO_FORMAT_NV24, formats::NV24 },
/* YUV Planar */
{ GST_VIDEO_FORMAT_I420, formats::YUV420 },
{ GST_VIDEO_FORMAT_YV12, formats::YVU420 },
{ GST_VIDEO_FORMAT_Y42B, formats::YUV422 },
/* YUV Packed */
{ GST_VIDEO_FORMAT_UYVY, formats::UYVY },
{ GST_VIDEO_FORMAT_VYUY, formats::VYUY },
{ GST_VIDEO_FORMAT_YUY2, formats::YUYV },
{ GST_VIDEO_FORMAT_YVYU, formats::YVYU },
/* \todo NV42 is used in libcamera but is not mapped in GStreamer yet. */
};
static GstVideoFormat
pixel_format_to_gst_format(const PixelFormat &format)
{
for (const auto &item : format_map) {
if (item.format == format)
return item.gst_format;
}
return GST_VIDEO_FORMAT_UNKNOWN;
}
static PixelFormat
gst_format_to_pixel_format(GstVideoFormat gst_format)
{
if (gst_format == GST_VIDEO_FORMAT_ENCODED)
return PixelFormat{};
for (const auto &item : format_map)
if (item.gst_format == gst_format)
return item.format;
return PixelFormat{};
}
static GstStructure *
bare_structure_from_format(const PixelFormat &format)
{
GstVideoFormat gst_format = pixel_format_to_gst_format(format);
if (gst_format == GST_VIDEO_FORMAT_UNKNOWN)
return nullptr;
if (gst_format != GST_VIDEO_FORMAT_ENCODED)
return gst_structure_new("video/x-raw", "format", G_TYPE_STRING,
gst_video_format_to_string(gst_format), nullptr);
switch (format) {
case formats::MJPEG:
return gst_structure_new_empty("image/jpeg");
default:
return nullptr;
}
}
GstCaps *
gst_libcamera_stream_formats_to_caps(const StreamFormats &formats)
{
GstCaps *caps = gst_caps_new_empty();
for (PixelFormat pixelformat : formats.pixelformats()) {
g_autoptr(GstStructure) bare_s = bare_structure_from_format(pixelformat);
if (!bare_s) {
GST_WARNING("Unsupported DRM format %" GST_FOURCC_FORMAT,
GST_FOURCC_ARGS(pixelformat));
continue;
}
for (const Size &size : formats.sizes(pixelformat)) {
GstStructure *s = gst_structure_copy(bare_s);
gst_structure_set(s,
"width", G_TYPE_INT, size.width,
"height", G_TYPE_INT, size.height,
nullptr);
gst_caps_append_structure(caps, s);
}
const SizeRange &range = formats.range(pixelformat);
if (range.hStep && range.vStep) {
GstStructure *s = gst_structure_copy(bare_s);
GValue val = G_VALUE_INIT;
g_value_init(&val, GST_TYPE_INT_RANGE);
gst_value_set_int_range_step(&val, range.min.width, range.max.width, range.hStep);
gst_structure_set_value(s, "width", &val);
gst_value_set_int_range_step(&val, range.min.height, range.max.height, range.vStep);
gst_structure_set_value(s, "height", &val);
g_value_unset(&val);
gst_caps_append_structure(caps, s);
}
}
return caps;
}
GstCaps *
gst_libcamera_stream_configuration_to_caps(const StreamConfiguration &stream_cfg)
{
GstCaps *caps = gst_caps_new_empty();
GstStructure *s = bare_structure_from_format(stream_cfg.pixelFormat);
gst_structure_set(s,
"width", G_TYPE_INT, stream_cfg.size.width,
"height", G_TYPE_INT, stream_cfg.size.height,
nullptr);
gst_caps_append_structure(caps, s);
return caps;
}
void
gst_libcamera_configure_stream_from_caps(StreamConfiguration &stream_cfg,
GstCaps *caps)
{
GstVideoFormat gst_format = pixel_format_to_gst_format(stream_cfg.pixelFormat);
guint i;
gint best_fixed = -1, best_in_range = -1;
GstStructure *s;
/*
* These are delta weight computed from:
* ABS(width - stream_cfg.size.width) * ABS(height - stream_cfg.size.height)
*/
guint best_fixed_delta = G_MAXUINT;
guint best_in_range_delta = G_MAXUINT;
/* First fixate the caps using default configuration value. */
g_assert(gst_caps_is_writable(caps));
/* Lookup the structure for a close match to the stream_cfg.size */
for (i = 0; i < gst_caps_get_size(caps); i++) {
s = gst_caps_get_structure(caps, i);
gint width, height;
guint delta;
if (gst_structure_has_field_typed(s, "width", G_TYPE_INT) &&
gst_structure_has_field_typed(s, "height", G_TYPE_INT)) {
gst_structure_get_int(s, "width", &width);
gst_structure_get_int(s, "height", &height);
delta = ABS(width - (gint)stream_cfg.size.width) * ABS(height - (gint)stream_cfg.size.height);
if (delta < best_fixed_delta) {
best_fixed_delta = delta;
best_fixed = i;
}
} else {
gst_structure_fixate_field_nearest_int(s, "width", stream_cfg.size.width);
gst_structure_fixate_field_nearest_int(s, "height", stream_cfg.size.height);
gst_structure_get_int(s, "width", &width);
gst_structure_get_int(s, "height", &height);
delta = ABS(width - (gint)stream_cfg.size.width) * ABS(height - (gint)stream_cfg.size.height);
if (delta < best_in_range_delta) {
best_in_range_delta = delta;
best_in_range = i;
}
}
}
/* Prefer reliable fixed value over ranges */
if (best_fixed >= 0)
s = gst_caps_get_structure(caps, best_fixed);
else
s = gst_caps_get_structure(caps, best_in_range);
if (gst_structure_has_name(s, "video/x-raw")) {
const gchar *format = gst_video_format_to_string(gst_format);
gst_structure_fixate_field_string(s, "format", format);
}
/* Then configure the stream with the result. */
if (gst_structure_has_name(s, "video/x-raw")) {
const gchar *format = gst_structure_get_string(s, "format");
gst_format = gst_video_format_from_string(format);
stream_cfg.pixelFormat = gst_format_to_pixel_format(gst_format);
} else if (gst_structure_has_name(s, "image/jpeg")) {
stream_cfg.pixelFormat = formats::MJPEG;
} else {
g_critical("Unsupported media type: %s", gst_structure_get_name(s));
}
gint width, height;
gst_structure_get_int(s, "width", &width);
gst_structure_get_int(s, "height", &height);
stream_cfg.size.width = width;
stream_cfg.size.height = height;
}
void
gst_libcamera_resume_task(GstTask *task)
{
/* We only want to resume the task if it's paused. */
GLibLocker lock(GST_OBJECT(task));
if (GST_TASK_STATE(task) == GST_TASK_PAUSED) {
GST_TASK_STATE(task) = GST_TASK_STARTED;
GST_TASK_SIGNAL(task);
}
}
G_LOCK_DEFINE_STATIC(cm_singleton_lock);
std::weak_ptr<CameraManager> cm_singleton_ptr;
std::shared_ptr<CameraManager>
gst_libcamera_get_camera_mananger(int &ret)
{
std::shared_ptr<CameraManager> cm;
G_LOCK(cm_singleton_lock);
cm = cm_singleton_ptr.lock();
if (!cm) {
cm = std::make_shared<CameraManager>();
cm_singleton_ptr = cm;
ret = cm->start();
} else {
ret = 0;
}
G_UNLOCK(cm_singleton_lock);
return cm;
}
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