{"id":9478,"url":"https://patchwork.libcamera.org/api/patches/9478/?format=json","web_url":"https://patchwork.libcamera.org/patch/9478/","project":{"id":1,"url":"https://patchwork.libcamera.org/api/projects/1/?format=json","name":"libcamera","link_name":"libcamera","list_id":"libcamera_core","list_email":"libcamera-devel@lists.libcamera.org","web_url":"","scm_url":"","webscm_url":""},"msgid":"<20200904063101.29133-2-email@uajain.com>","date":"2020-09-04T06:31:00","name":"[libcamera-devel,v6,1/2] libcamera: android: Add EXIF infrastructure","commit_ref":null,"pull_url":null,"state":"accepted","archived":false,"hash":"8185bd3318c2f3667565eaf6280b44576a68941c","submitter":{"id":1,"url":"https://patchwork.libcamera.org/api/people/1/?format=json","name":"Umang Jain","email":"email@uajain.com"},"delegate":{"id":12,"url":"https://patchwork.libcamera.org/api/users/12/?format=json","username":"uajain","first_name":"Umang","last_name":"Jain","email":"umang.jain@ideasonboard.com"},"mbox":"https://patchwork.libcamera.org/patch/9478/mbox/","series":[{"id":1261,"url":"https://patchwork.libcamera.org/api/series/1261/?format=json","web_url":"https://patchwork.libcamera.org/project/libcamera/list/?series=1261","date":"2020-09-04T06:30:59","name":"Initial EXIF metadata support","version":6,"mbox":"https://patchwork.libcamera.org/series/1261/mbox/"}],"comments":"https://patchwork.libcamera.org/api/patches/9478/comments/","check":"pending","checks":"https://patchwork.libcamera.org/api/patches/9478/checks/","tags":{},"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 1CA24BF019\n\tfor ;\n\tFri, 4 Sep 2020 06:31:21 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id DCD36629B6;\n\tFri, 4 Sep 2020 08:31:20 +0200 (CEST)","from mail.uajain.com (static.126.159.217.95.clients.your-server.de\n\t[95.217.159.126])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 33BD66036F\n\tfor ;\n\tFri, 4 Sep 2020 08:31:19 +0200 (CEST)"],"Authentication-Results":"lancelot.ideasonboard.com;\n\tdkim=fail reason=\"signature verification failed\" (2048-bit key;\n\tunprotected) header.d=uajain.com header.i=@uajain.com\n\theader.b=\"Gf2YeNNW\"; dkim-atps=neutral","From":"Umang Jain ","DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/simple; d=uajain.com; s=mail;\n\tt=1599201078; bh=wItggernxYqx/0qdbms0u/2TVGnoK5ZXYfbxbGHOggw=;\n\th=From:To:Cc:Subject:In-Reply-To:References;\n\tb=Gf2YeNNW0Qj1mXKvePJVOCbkXIdWnYrhDQCLjYBPDkiT5Wir/B/dkiZb6P1tKGPg0\n\ttCe5IE8imSHj4eUj2t6aMraWTsEqj7NDuKPi1Pp9kq+JPF03g5X2ZFfBEkH+agRA+e\n\tQr6FSlcgRikmek/aSZ0G6Pz68gEy1f3DvRnbcRhb0XWJGmG96lvbdMxRW2qVrp84ix\n\tZgYPQV53iVYGbn2M3eXx+xqZmA/01HSOBf7gtZPrhzLJgZHzlgTxXqpSjZlIJnUmiw\n\tzviARwrQ8p34j2DbVOex5M2QDw+Eyo1n52A3Rx4JlkdndSxCgfIDl1TGOkb5bYZzqV\n\tZd+oJF6Vdbw+A==","To":"libcamera-devel@lists.libcamera.org","Date":"Fri, 4 Sep 2020 12:01:00 +0530","Message-Id":"<20200904063101.29133-2-email@uajain.com>","In-Reply-To":"<20200904063101.29133-1-email@uajain.com>","References":"<20200904063101.29133-1-email@uajain.com>","Mime-Version":"1.0","Subject":"[libcamera-devel] [PATCH v6 1/2] libcamera: android: Add EXIF\n\tinfrastructure","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","Content-Type":"text/plain; charset=\"us-ascii\"","Content-Transfer-Encoding":"7bit","Errors-To":"libcamera-devel-bounces@lists.libcamera.org","Sender":"\"libcamera-devel\" "},"content":"From: Kieran Bingham \n\nProvide helper classes to utilise the libexif interfaces and link\nagainst libexif to support tag additions when creating JPEG images.\n\nSigned-off-by: Kieran Bingham \nSigned-off-by: Umang Jain \nReviewed-by: Kieran Bingham \nReviewed-by: Laurent Pinchart \n---\n src/android/jpeg/exif.cpp | 188 ++++++++++++++++++++++++++++++++++++++\n src/android/jpeg/exif.h | 46 ++++++++++\n src/android/meson.build | 2 +\n 3 files changed, 236 insertions(+)\n create mode 100644 src/android/jpeg/exif.cpp\n create mode 100644 src/android/jpeg/exif.h","diff":"diff --git a/src/android/jpeg/exif.cpp b/src/android/jpeg/exif.cpp\nnew file mode 100644\nindex 0000000..41ddf48\n--- /dev/null\n+++ b/src/android/jpeg/exif.cpp\n@@ -0,0 +1,188 @@\n+/* SPDX-License-Identifier: GPL-2.0-or-later */\n+/*\n+ * Copyright (C) 2020, Google Inc.\n+ *\n+ * exif.cpp - EXIF tag creation using libexif\n+ */\n+\n+#include \"exif.h\"\n+\n+#include \"libcamera/internal/log.h\"\n+\n+using namespace libcamera;\n+\n+LOG_DEFINE_CATEGORY(EXIF)\n+\n+/*\n+ * The Exif class should be instantiated and specific properties set\n+ * through the exposed public API.\n+ *\n+ * Once all desired properties have been set, the user shall call\n+ * generate() to process the entries and generate the Exif data.\n+ *\n+ * Calls to generate() must check the return code to determine if any error\n+ * occurred during the construction of the Exif data, and if successful the\n+ * data can be obtained using the data() method.\n+ */\n+Exif::Exif()\n+\t: valid_(false), data_(nullptr), exifData_(0), size_(0)\n+{\n+\t/* Create an ExifMem allocator to construct entries. */\n+\tmem_ = exif_mem_new_default();\n+\tif (!mem_) {\n+\t\tLOG(EXIF, Error) << \"Failed to allocate ExifMem Allocator\";\n+\t\treturn;\n+\t}\n+\n+\tdata_ = exif_data_new_mem(mem_);\n+\tif (!data_) {\n+\t\tLOG(EXIF, Error) << \"Failed to allocate an ExifData structure\";\n+\t\treturn;\n+\t}\n+\n+\tvalid_ = true;\n+\n+\texif_data_set_option(data_, EXIF_DATA_OPTION_FOLLOW_SPECIFICATION);\n+\texif_data_set_data_type(data_, EXIF_DATA_TYPE_COMPRESSED);\n+\n+\t/*\n+\t * Big-Endian: EXIF_BYTE_ORDER_MOTOROLA\n+\t * Little Endian: EXIF_BYTE_ORDER_INTEL\n+\t */\n+\texif_data_set_byte_order(data_, EXIF_BYTE_ORDER_INTEL);\n+\n+\t/* Create the mandatory EXIF fields with default data. */\n+\texif_data_fix(data_);\n+}\n+\n+Exif::~Exif()\n+{\n+\tif (exifData_)\n+\t\tfree(exifData_);\n+\n+\tif (data_)\n+\t\texif_data_unref(data_);\n+\n+\tif (mem_)\n+\t\texif_mem_unref(mem_);\n+}\n+\n+ExifEntry *Exif::createEntry(ExifIfd ifd, ExifTag tag)\n+{\n+\tExifContent *content = data_->ifd[ifd];\n+\tExifEntry *entry = exif_content_get_entry(content, tag);\n+\n+\tif (entry) {\n+\t\texif_entry_ref(entry);\n+\t\treturn entry;\n+\t}\n+\n+\tentry = exif_entry_new_mem(mem_);\n+\tif (!entry) {\n+\t\tLOG(EXIF, Error) << \"Failed to allocated new entry\";\n+\t\tvalid_ = false;\n+\t\treturn nullptr;\n+\t}\n+\n+\texif_content_add_entry(content, entry);\n+\texif_entry_initialize(entry, tag);\n+\n+\treturn entry;\n+}\n+\n+ExifEntry *Exif::createEntry(ExifIfd ifd, ExifTag tag, ExifFormat format,\n+\t\t\t unsigned long components, unsigned int size)\n+{\n+\tExifContent *content = data_->ifd[ifd];\n+\n+\t/* Replace any existing entry with the same tag. */\n+\tExifEntry *existing = exif_content_get_entry(content, tag);\n+\texif_content_remove_entry(content, existing);\n+\n+\tExifEntry *entry = exif_entry_new_mem(mem_);\n+\tif (!entry) {\n+\t\tLOG(EXIF, Error) << \"Failed to allocated new entry\";\n+\t\tvalid_ = false;\n+\t\treturn nullptr;\n+\t}\n+\n+\tvoid *buffer = exif_mem_alloc(mem_, size);\n+\tif (!buffer) {\n+\t\tLOG(EXIF, Error) << \"Failed to allocate buffer for variable entry\";\n+\t\texif_mem_unref(mem_);\n+\t\tvalid_ = false;\n+\t\treturn nullptr;\n+\t}\n+\n+\tentry->data = static_cast(buffer);\n+\tentry->components = components;\n+\tentry->format = format;\n+\tentry->size = size;\n+\tentry->tag = tag;\n+\n+\texif_content_add_entry(content, entry);\n+\n+\treturn entry;\n+}\n+\n+void Exif::setShort(ExifIfd ifd, ExifTag tag, uint16_t item)\n+{\n+\tExifEntry *entry = createEntry(ifd, tag);\n+\tif (!entry)\n+\t\treturn;\n+\n+\texif_set_short(entry->data, EXIF_BYTE_ORDER_INTEL, item);\n+\texif_entry_unref(entry);\n+}\n+\n+void Exif::setLong(ExifIfd ifd, ExifTag tag, uint32_t item)\n+{\n+\tExifEntry *entry = createEntry(ifd, tag);\n+\tif (!entry)\n+\t\treturn;\n+\n+\texif_set_long(entry->data, EXIF_BYTE_ORDER_INTEL, item);\n+\texif_entry_unref(entry);\n+}\n+\n+void Exif::setRational(ExifIfd ifd, ExifTag tag, ExifRational item)\n+{\n+\tExifEntry *entry = createEntry(ifd, tag);\n+\tif (!entry)\n+\t\treturn;\n+\n+\texif_set_rational(entry->data, EXIF_BYTE_ORDER_INTEL, item);\n+\texif_entry_unref(entry);\n+}\n+\n+void Exif::setString(ExifIfd ifd, ExifTag tag, ExifFormat format, const std::string &item)\n+{\n+\t/* Pad 1 extra byte for null-terminated string. */\n+\tsize_t length = item.length() + 1;\n+\n+\tExifEntry *entry = createEntry(ifd, tag, format, length, length);\n+\tif (!entry)\n+\t\treturn;\n+\n+\tmemcpy(entry->data, item.c_str(), length);\n+\texif_entry_unref(entry);\n+}\n+\n+[[nodiscard]] int Exif::generate()\n+{\n+\tif (exifData_) {\n+\t\tfree(exifData_);\n+\t\texifData_ = nullptr;\n+\t}\n+\n+\tif (!valid_) {\n+\t\tLOG(EXIF, Error) << \"Generated EXIF data is invalid\";\n+\t\treturn -1;\n+\t}\n+\n+\texif_data_save_data(data_, &exifData_, &size_);\n+\n+\tLOG(EXIF, Debug) << \"Created EXIF instance (\" << size_ << \" bytes)\";\n+\n+\treturn 0;\n+}\ndiff --git a/src/android/jpeg/exif.h b/src/android/jpeg/exif.h\nnew file mode 100644\nindex 0000000..8dfc324\n--- /dev/null\n+++ b/src/android/jpeg/exif.h\n@@ -0,0 +1,46 @@\n+/* SPDX-License-Identifier: GPL-2.0-or-later */\n+/*\n+ * Copyright (C) 2020, Google Inc.\n+ *\n+ * exif.h - EXIF tag creator using libexif\n+ */\n+#ifndef __ANDROID_JPEG_EXIF_H__\n+#define __ANDROID_JPEG_EXIF_H__\n+\n+#include \n+#include \n+\n+#include \n+\n+#include \n+\n+class Exif\n+{\n+public:\n+\tExif();\n+\t~Exif();\n+\n+\tlibcamera::Span data() const { return { exifData_, size_ }; }\n+\t[[nodiscard]] int generate();\n+\n+private:\n+\tExifEntry *createEntry(ExifIfd ifd, ExifTag tag);\n+\tExifEntry *createEntry(ExifIfd ifd, ExifTag tag, ExifFormat format,\n+\t\t\t unsigned long components, unsigned int size);\n+\n+\tvoid setShort(ExifIfd ifd, ExifTag tag, uint16_t item);\n+\tvoid setLong(ExifIfd ifd, ExifTag tag, uint32_t item);\n+\tvoid setString(ExifIfd ifd, ExifTag tag, ExifFormat format,\n+\t\t const std::string &item);\n+\tvoid setRational(ExifIfd ifd, ExifTag tag, ExifRational item);\n+\n+\tbool valid_;\n+\n+\tExifData *data_;\n+\tExifMem *mem_;\n+\n+\tunsigned char *exifData_;\n+\tunsigned int size_;\n+};\n+\n+#endif /* __ANDROID_JPEG_EXIF_H__ */\ndiff --git a/src/android/meson.build b/src/android/meson.build\nindex f7b81a4..ecb92f6 100644\n--- a/src/android/meson.build\n+++ b/src/android/meson.build\n@@ -7,6 +7,7 @@ android_hal_sources = files([\n 'camera_metadata.cpp',\n 'camera_ops.cpp',\n 'jpeg/encoder_libjpeg.cpp',\n+ 'jpeg/exif.cpp',\n ])\n \n android_camera_metadata_sources = files([\n@@ -14,6 +15,7 @@ android_camera_metadata_sources = files([\n ])\n \n android_deps = [\n+ dependency('libexif'),\n dependency('libjpeg'),\n ]\n \n","prefixes":["libcamera-devel","v6","1/2"]}