[{"id":23723,"web_url":"https://patchwork.libcamera.org/comment/23723/","msgid":"<71a307e713e9fef85b2321b3b9725be45948f5d1.camel@collabora.com>","date":"2022-07-04T18:08:14","subject":"Re: [libcamera-devel] [PATCH v1 1/5] gstreamer: Convert form\n\tcolorspace to colorimetry.","submitter":{"id":31,"url":"https://patchwork.libcamera.org/api/people/31/","name":"Nicolas Dufresne","email":"nicolas.dufresne@collabora.com"},"content":"Hi Rishikesh,\n\nIn the subject line, \"Convert form\" should be \"Convert from\". I would probably\nuse some way so readers knows that your converting from GStreamer to Libcamera\nrepresentation of colorspace/colorimetry.\n\nLe dimanche 03 juillet 2022 à 13:03 +0530, Rishikesh Donadkar a écrit :\n> Libcamera StreamConfiguration class has colorSpace attribute, which\n> holds the colorspace that is being applied to the camera after the\n> validation of the camera configuration.\n> \n> Map between the libcamera colorspace and GStreamer colorimetry and find\n> the closest colorimetry corresponding to the colorspace in stream\n> configuration.\n> \n> Signed-off-by: Rishikesh Donadkar \n> ---\n> src/gstreamer/gstlibcamera-utils.cpp | 71 ++++++++++++++++++++++++++++\n> 1 file changed, 71 insertions(+)\n> \n> diff --git a/src/gstreamer/gstlibcamera-utils.cpp b/src/gstreamer/gstlibcamera-utils.cpp\n> index 3f242286..20c39919 100644\n> --- a/src/gstreamer/gstlibcamera-utils.cpp\n> +++ b/src/gstreamer/gstlibcamera-utils.cpp\n> @@ -45,6 +45,34 @@ static struct {\n> \t/* \\todo NV42 is used in libcamera but is not mapped in GStreamer yet. */\n> };\n> \n> +static const std::vector> ColorSpaceTocolorimetry = {\n> +\t{ ColorSpace::Srgb, GST_VIDEO_COLORIMETRY_SRGB },\n> +\t{ ColorSpace::Rec709, GST_VIDEO_COLORIMETRY_BT709 },\n> +\t{ ColorSpace::Rec2020, GST_VIDEO_COLORIMETRY_BT2020 },\n> +};\n> +\n> +static const std::map ToGstVideoColorPrimaries = {\n> +\t{ ColorSpace::Primaries::Smpte170m, GST_VIDEO_COLOR_PRIMARIES_SMPTE170M },\n> +\t{ ColorSpace::Primaries::Rec709, GST_VIDEO_COLOR_PRIMARIES_BT709 },\n> +\t{ ColorSpace::Primaries::Rec2020, GST_VIDEO_COLOR_PRIMARIES_BT2020 },\n> +};\n> +\n> +static const std::map ToGstVideoTransferFunction = {\n> +\t{ ColorSpace::TransferFunction::Srgb, GST_VIDEO_TRANSFER_SRGB },\n> +\t{ ColorSpace::TransferFunction::Rec709, GST_VIDEO_TRANSFER_BT709 },\n> +};\n> +\n> +static const std::map ToGstVideoColorMatrix = {\n> +\t{ ColorSpace::YcbcrEncoding::Rec601, GST_VIDEO_COLOR_MATRIX_BT601 },\n> +\t{ ColorSpace::YcbcrEncoding::Rec709, GST_VIDEO_COLOR_MATRIX_BT709 },\n> +\t{ ColorSpace::YcbcrEncoding::Rec2020, GST_VIDEO_COLOR_MATRIX_BT2020 },\n> +};\n> +\n> +static const std::map ToGstVideoColorRange = {\n> +\t{ ColorSpace::Range::Full, GST_VIDEO_COLOR_RANGE_0_255 },\n> +\t{ ColorSpace::Range::Limited, GST_VIDEO_COLOR_RANGE_16_235 },\n> +};\n> +\n> static GstVideoFormat\n> pixel_format_to_gst_format(const PixelFormat &format)\n> {\n> @@ -87,6 +115,49 @@ bare_structure_from_format(const PixelFormat &format)\n> \t}\n> }\n> \n> +static const gchar *\n> +colorimerty_from_colorspace(std::optional colorSpace)\n> +{\n> +\tconst gchar *colorimetry_str;\n> +\tGstVideoColorimetry colorimetry;\n> +\n> +\tauto iterColorimetry = std::find_if(ColorSpaceTocolorimetry.begin(), ColorSpaceTocolorimetry.end(),\n> +\t\t\t\t\t [&colorSpace](const auto &item) {\n> +\t\t\t\t\t\t return colorSpace == item.first;\n> +\t\t\t\t\t });\n> +\tif (iterColorimetry != ColorSpaceTocolorimetry.end()) {\n> +\t\tcolorimetry_str = (gchar *)iterColorimetry->second.c_str();\n\nAny reason for this cast ?\n\n> +\t\treturn colorimetry_str;\n\nI believe, even libcamera may pick a well known colorspace with small\nalteration. So instead of this, you maybe want to call\ngst_video_colorimetry_from_string() and keep processing the rest of the\ncolorSpace information.\n\nYou should also pick a well known default, or just add the possibility to not\nset the colorimetry field at all.\n\n> +\t}\n> +\n> +\tauto iterPrimaries = ToGstVideoColorPrimaries.find(colorSpace->primaries);\n> +\tif (iterPrimaries != ToGstVideoColorPrimaries.end())\n> +\t\tcolorimetry.primaries = iterPrimaries->second;\n> +\telse\n> +\t\tcolorimetry.primaries = GST_VIDEO_COLOR_PRIMARIES_UNKNOWN;\n\nThis should never be used. It is only there so that we can set an invalid\ndefault to the structure, or to signal an parsing error.\n\n> +\n> +\tauto iterTransferFunction = ToGstVideoTransferFunction.find(colorSpace->transferFunction);\n> +\tif (iterTransferFunction != ToGstVideoTransferFunction.end())\n> +\t\tcolorimetry.transfer = iterTransferFunction->second;\n> +\telse\n> +\t\tcolorimetry.transfer = GST_VIDEO_TRANSFER_UNKNOWN;\n\nSame.\n\n> +\n> +\tauto iterYcbcrEncoding = ToGstVideoColorMatrix.find(colorSpace->ycbcrEncoding);\n> +\tif (iterYcbcrEncoding != ToGstVideoColorMatrix.end())\n> +\t\tcolorimetry.matrix = iterYcbcrEncoding->second;\n> +\telse\n> +\t\tcolorimetry.matrix = GST_VIDEO_COLOR_MATRIX_UNKNOWN;\n\nSame.\n\n> +\n> +\tauto iterRange = ToGstVideoColorRange.find(colorSpace->range);\n> +\tif (iterRange != ToGstVideoColorRange.end())\n> +\t\tcolorimetry.range = iterRange->second;\n> +\telse\n> +\t\tcolorimetry.range = GST_VIDEO_COLOR_RANGE_UNKNOWN;\n\nSame.\n\n> +\n> +\tcolorimetry_str = gst_video_colorimetry_to_string(&colorimetry);\n> +\treturn colorimetry_str;\n\nAs the return is a const char *, the colorimetry string is leaked here.\n\n> +}\n> +\n> GstCaps *\n> gst_libcamera_stream_formats_to_caps(const StreamFormats &formats)\n> {","headers":{"Return-Path":"","X-Original-To":"parsemail@patchwork.libcamera.org","Delivered-To":"parsemail@patchwork.libcamera.org","Received":["from lancelot.ideasonboard.com (lancelot.ideasonboard.com\n\t[92.243.16.209])\n\tby patchwork.libcamera.org (Postfix) with ESMTPS id 13EDFBE173\n\tfor ;\n\tMon, 4 Jul 2022 18:08:26 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id C2DAE6564E;\n\tMon, 4 Jul 2022 20:08:25 +0200 (CEST)","from madras.collabora.co.uk (madras.collabora.co.uk\n\t[46.235.227.172])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 5A0F661FB1\n\tfor ;\n\tMon, 4 Jul 2022 20:08:24 +0200 (CEST)","from nicolas-tpx395.localdomain (mtl.collabora.ca 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-0400","In-Reply-To":"<20220703073358.76643-1-rishikeshdonadkar@gmail.com>","References":"<20220703073358.76643-1-rishikeshdonadkar@gmail.com>","Content-Type":"text/plain; charset=\"UTF-8\"","Content-Transfer-Encoding":"quoted-printable","User-Agent":"Evolution 3.44.2 (3.44.2-1.fc36) ","MIME-Version":"1.0","Subject":"Re: [libcamera-devel] [PATCH v1 1/5] gstreamer: Convert form\n\tcolorspace to colorimetry.","X-BeenThere":"libcamera-devel@lists.libcamera.org","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","From":"Nicolas Dufresne via libcamera-devel\n\t","Reply-To":"Nicolas Dufresne ","Cc":"vedantparanjape160201@gmail.com","Errors-To":"libcamera-devel-bounces@lists.libcamera.org","Sender":"\"libcamera-devel\" "}},{"id":23740,"web_url":"https://patchwork.libcamera.org/comment/23740/","msgid":"","date":"2022-07-05T13:37:40","subject":"Re: [libcamera-devel] [PATCH v1 1/5] gstreamer: Convert form\n\tcolorspace to colorimetry.","submitter":{"id":85,"url":"https://patchwork.libcamera.org/api/people/85/","name":"Vedant Paranjape","email":"vedantparanjape160201@gmail.com"},"content":"Hello Rishikesh,\n\nThanks for the patch.\n\nSubject line can be better as suggested by Nicolas:\n\ngstreamer: convert from GStreamer to libcamera colorspace\n\nOn Sun, Jul 3, 2022 at 9:34 AM Rishikesh Donadkar <\nrishikeshdonadkar@gmail.com> wrote:\n\n> Libcamera StreamConfiguration class has colorSpace attribute, which\n> holds the colorspace that is being applied to the camera after the\n> validation of the camera configuration.\n>\n> Map between the libcamera colorspace and GStreamer colorimetry and find\n> the closest colorimetry corresponding to the colorspace in stream\n> configuration.\n>\n\ns/Map between the libcamera colorspace and GStreamer colorimetr/Map the\nlibcamera colorspace to GStreamer colorimetry.\n\n\n> Signed-off-by: Rishikesh Donadkar \n> ---\n> src/gstreamer/gstlibcamera-utils.cpp | 71 ++++++++++++++++++++++++++++\n> 1 file changed, 71 insertions(+)\n>\n> diff --git a/src/gstreamer/gstlibcamera-utils.cpp\n> b/src/gstreamer/gstlibcamera-utils.cpp\n> index 3f242286..20c39919 100644\n> --- a/src/gstreamer/gstlibcamera-utils.cpp\n> +++ b/src/gstreamer/gstlibcamera-utils.cpp\n> @@ -45,6 +45,34 @@ static struct {\n> /* \\todo NV42 is used in libcamera but is not mapped in GStreamer\n> yet. */\n> };\n>\n> +static const std::vector>\n> ColorSpaceTocolorimetry = {\n> + { ColorSpace::Srgb, GST_VIDEO_COLORIMETRY_SRGB },\n> + { ColorSpace::Rec709, GST_VIDEO_COLORIMETRY_BT709 },\n> + { ColorSpace::Rec2020, GST_VIDEO_COLORIMETRY_BT2020 },\n> +};\n> +\n> +static const std::map\n> ToGstVideoColorPrimaries = {\n> + { ColorSpace::Primaries::Smpte170m,\n> GST_VIDEO_COLOR_PRIMARIES_SMPTE170M },\n> + { ColorSpace::Primaries::Rec709, GST_VIDEO_COLOR_PRIMARIES_BT709 },\n> + { ColorSpace::Primaries::Rec2020, GST_VIDEO_COLOR_PRIMARIES_BT2020\n> },\n> +};\n> +\n> +static const std::map GstVideoTransferFunction> ToGstVideoTransferFunction = {\n> + { ColorSpace::TransferFunction::Srgb, GST_VIDEO_TRANSFER_SRGB },\n> + { ColorSpace::TransferFunction::Rec709, GST_VIDEO_TRANSFER_BT709 },\n> +};\n> +\n> +static const std::map\n> ToGstVideoColorMatrix = {\n> + { ColorSpace::YcbcrEncoding::Rec601, GST_VIDEO_COLOR_MATRIX_BT601\n> },\n> + { ColorSpace::YcbcrEncoding::Rec709, GST_VIDEO_COLOR_MATRIX_BT709\n> },\n> + { ColorSpace::YcbcrEncoding::Rec2020,\n> GST_VIDEO_COLOR_MATRIX_BT2020 },\n> +};\n> +\n> +static const std::map\n> ToGstVideoColorRange = {\n> + { ColorSpace::Range::Full, GST_VIDEO_COLOR_RANGE_0_255 },\n> + { ColorSpace::Range::Limited, GST_VIDEO_COLOR_RANGE_16_235 },\n> +};\n> +\n> static GstVideoFormat\n> pixel_format_to_gst_format(const PixelFormat &format)\n> {\n> @@ -87,6 +115,49 @@ bare_structure_from_format(const PixelFormat &format)\n> }\n> }\n>\n> +static const gchar *\n> +colorimerty_from_colorspace(std::optional colorSpace)\n> +{\n> + const gchar *colorimetry_str;\n> + GstVideoColorimetry colorimetry;\n> +\n> + auto iterColorimetry =\n> std::find_if(ColorSpaceTocolorimetry.begin(), ColorSpaceTocolorimetry.end(),\n> + [&colorSpace](const auto\n> &item) {\n> + return colorSpace ==\n> item.first;\n> + });\n> + if (iterColorimetry != ColorSpaceTocolorimetry.end()) {\n> + colorimetry_str = (gchar *)iterColorimetry->second.c_str();\n> + return colorimetry_str;\n> + }\n> +\n> + auto iterPrimaries =\n> ToGstVideoColorPrimaries.find(colorSpace->primaries);\n> + if (iterPrimaries != ToGstVideoColorPrimaries.end())\n> + colorimetry.primaries = iterPrimaries->second;\n> + else\n> + colorimetry.primaries = GST_VIDEO_COLOR_PRIMARIES_UNKNOWN;\n> +\n> + auto iterTransferFunction =\n> ToGstVideoTransferFunction.find(colorSpace->transferFunction);\n> + if (iterTransferFunction != ToGstVideoTransferFunction.end())\n> + colorimetry.transfer = iterTransferFunction->second;\n> + else\n> + colorimetry.transfer = GST_VIDEO_TRANSFER_UNKNOWN;\n> +\n> + auto iterYcbcrEncoding =\n> ToGstVideoColorMatrix.find(colorSpace->ycbcrEncoding);\n> + if (iterYcbcrEncoding != ToGstVideoColorMatrix.end())\n> + colorimetry.matrix = iterYcbcrEncoding->second;\n> + else\n> + colorimetry.matrix = GST_VIDEO_COLOR_MATRIX_UNKNOWN;\n> +\n> + auto iterRange = ToGstVideoColorRange.find(colorSpace->range);\n> + if (iterRange != ToGstVideoColorRange.end())\n> + colorimetry.range = iterRange->second;\n> + else\n> + colorimetry.range = GST_VIDEO_COLOR_RANGE_UNKNOWN;\n> +\n> + colorimetry_str = gst_video_colorimetry_to_string(&colorimetry);\n> + return colorimetry_str;\n> +}\n> +\n> GstCaps *\n> gst_libcamera_stream_formats_to_caps(const StreamFormats &formats)\n> {\n> --\n> 2.25.1\n>\n>\nRegards,\nVedant Paranjape","headers":{"Return-Path":"","X-Original-To":"parsemail@patchwork.libcamera.org","Delivered-To":"parsemail@patchwork.libcamera.org","Received":["from lancelot.ideasonboard.com 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(PDT)","MIME-Version":"1.0","References":"<20220703073358.76643-1-rishikeshdonadkar@gmail.com>","In-Reply-To":"<20220703073358.76643-1-rishikeshdonadkar@gmail.com>","Date":"Tue, 5 Jul 2022 15:37:40 +0200","Message-ID":"","To":"Rishikesh Donadkar ","Content-Type":"multipart/alternative; boundary=\"0000000000008fb14805e30ef55c\"","Subject":"Re: [libcamera-devel] [PATCH v1 1/5] gstreamer: Convert form\n\tcolorspace to colorimetry.","X-BeenThere":"libcamera-devel@lists.libcamera.org","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","From":"Vedant Paranjape via libcamera-devel\n\t","Reply-To":"Vedant Paranjape ","Cc":"LibCamera Devel ,\n\tNicolas Dufresne ","Errors-To":"libcamera-devel-bounces@lists.libcamera.org","Sender":"\"libcamera-devel\" "}}]