From eee8f56f0a7f34574752948027843bf6a1912e90 Mon Sep 17 00:00:00 2001 From: Nicolas Dufresne Date: Tue, 14 Jan 2020 10:55:01 -0500 Subject: gst: Add utility to convert StreamFormats to GstCaps This transforms the basic information found in StreamFormats to GstCaps. This can be handy to reply to early caps query or inside a device provider. Note that we ignored generated range as they are harmful to caps negotiation. We also don't simplify the caps for readability reasons, so some of the discrete value may be included in a range. Signed-off-by: Nicolas Dufresne Reviewed-by: Laurent Pinchart Signed-off-by: Laurent Pinchart --- src/gstreamer/gstlibcamera-utils.cpp | 105 +++++++++++++++++++++++++++++++++++ src/gstreamer/gstlibcamera-utils.h | 19 +++++++ src/gstreamer/meson.build | 1 + 3 files changed, 125 insertions(+) create mode 100644 src/gstreamer/gstlibcamera-utils.cpp create mode 100644 src/gstreamer/gstlibcamera-utils.h diff --git a/src/gstreamer/gstlibcamera-utils.cpp b/src/gstreamer/gstlibcamera-utils.cpp new file mode 100644 index 00000000..386ec364 --- /dev/null +++ b/src/gstreamer/gstlibcamera-utils.cpp @@ -0,0 +1,105 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ +/* + * Copyright (C) 2020, Collabora Ltd. + * Author: Nicolas Dufresne + * + * gstlibcamera-utils.c - GStreamer libcamera Utility Function + */ + +#include "gstlibcamera-utils.h" + +#include + +using namespace libcamera; + +static struct { + GstVideoFormat gst_format; + guint drm_fourcc; +} format_map[] = { + { GST_VIDEO_FORMAT_ENCODED, DRM_FORMAT_MJPEG }, + { GST_VIDEO_FORMAT_RGB, DRM_FORMAT_BGR888 }, + { GST_VIDEO_FORMAT_BGR, DRM_FORMAT_RGB888 }, + { GST_VIDEO_FORMAT_ARGB, DRM_FORMAT_BGRA8888 }, + { GST_VIDEO_FORMAT_NV12, DRM_FORMAT_NV12 }, + { GST_VIDEO_FORMAT_NV21, DRM_FORMAT_NV21 }, + { GST_VIDEO_FORMAT_NV16, DRM_FORMAT_NV16 }, + { GST_VIDEO_FORMAT_NV61, DRM_FORMAT_NV61 }, + { GST_VIDEO_FORMAT_NV24, DRM_FORMAT_NV24 }, + { GST_VIDEO_FORMAT_UYVY, DRM_FORMAT_UYVY }, + { GST_VIDEO_FORMAT_VYUY, DRM_FORMAT_VYUY }, + { GST_VIDEO_FORMAT_YUY2, DRM_FORMAT_YUYV }, + { GST_VIDEO_FORMAT_YVYU, DRM_FORMAT_YVYU }, + /* \todo NV42 is used in libcamera but is not mapped in GStreamer yet. */ +}; + +static GstVideoFormat +drm_to_gst_format(guint drm_fourcc) +{ + for (const auto &item : format_map) { + if (item.drm_fourcc == drm_fourcc) + return item.gst_format; + } + return GST_VIDEO_FORMAT_UNKNOWN; +} + +static GstStructure * +bare_structure_from_fourcc(guint fourcc) +{ + GstVideoFormat gst_format = drm_to_gst_format(fourcc); + + 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 (fourcc) { + case DRM_FORMAT_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 (unsigned int fourcc : formats.pixelformats()) { + g_autoptr(GstStructure) bare_s = bare_structure_from_fourcc(fourcc); + + if (!bare_s) { + GST_WARNING("Unsupported DRM format %" GST_FOURCC_FORMAT, + GST_FOURCC_ARGS(fourcc)); + continue; + } + + for (const Size &size : formats.sizes(fourcc)) { + 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(fourcc); + 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; +} diff --git a/src/gstreamer/gstlibcamera-utils.h b/src/gstreamer/gstlibcamera-utils.h new file mode 100644 index 00000000..2e4e3042 --- /dev/null +++ b/src/gstreamer/gstlibcamera-utils.h @@ -0,0 +1,19 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ +/* + * Copyright (C) 2020, Collabora Ltd. + * Author: Nicolas Dufresne + * + * gstlibcamera-utils.h - GStreamer libcamera Utility Functions + */ + +#ifndef __GST_LIBCAMERA_UTILS_H__ +#define __GST_LIBCAMERA_UTILS_H__ + +#include +#include + +#include + +GstCaps *gst_libcamera_stream_formats_to_caps(const libcamera::StreamFormats &formats); + +#endif /* __GST_LIBCAMERA_UTILS_H__ */ diff --git a/src/gstreamer/meson.build b/src/gstreamer/meson.build index 490e030e..9b11a46f 100644 --- a/src/gstreamer/meson.build +++ b/src/gstreamer/meson.build @@ -1,4 +1,5 @@ libcamera_gst_sources = [ + 'gstlibcamera-utils.cpp', 'gstlibcamera.c', 'gstlibcamerasrc.cpp', ] -- cgit v1.2.1