From patchwork Tue Aug 25 20:10:40 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Umang Jain X-Patchwork-Id: 9382 Return-Path: X-Original-To: parsemail@patchwork.libcamera.org Delivered-To: parsemail@patchwork.libcamera.org Received: from lancelot.ideasonboard.com (lancelot.ideasonboard.com [92.243.16.209]) by patchwork.libcamera.org (Postfix) with ESMTPS id C2801BD87E for ; Tue, 25 Aug 2020 20:10:42 +0000 (UTC) Received: from lancelot.ideasonboard.com (localhost [IPv6:::1]) by lancelot.ideasonboard.com (Postfix) with ESMTP id 8F3B8628CD; Tue, 25 Aug 2020 22:10:42 +0200 (CEST) Authentication-Results: lancelot.ideasonboard.com; dkim=fail reason="signature verification failed" (1024-bit key; unprotected) header.d=uajain.com header.i=@uajain.com header.b="K9SqdbXJ"; dkim-atps=neutral Received: from o1.f.az.sendgrid.net (o1.f.az.sendgrid.net [208.117.55.132]) by lancelot.ideasonboard.com (Postfix) with ESMTPS id 86B096037C for ; Tue, 25 Aug 2020 22:10:41 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=uajain.com; h=from:subject:mime-version:to:cc:content-transfer-encoding: content-type; s=s1; bh=OhuNKkqUEvX9FzUuIh7SR0Wks/BFouW4fm9gZcOJWg4=; b=K9SqdbXJjr0hshKwplRPsgXAwCWB0EOKT5ebTEww3BZRqim18Q53b4zXcKXo2fXTxKZV dWnBM0K/Sj/mEfT1bHe+aE/HTtS7nDzSxW/Wdn/G31+wqqplHmZj3e+VnGyxOXquEkQQKQ 88tT39dkeclVjajEuCWGdnPXdGl+MO2/w= Received: by filterdrecv-p3mdw1-5b7978bb98-6v6r5 with SMTP id filterdrecv-p3mdw1-5b7978bb98-6v6r5-20-5F45703F-6B 2020-08-25 20:10:40.210581051 +0000 UTC m=+2405.590399306 Received: from mail.uajain.com (unknown) by ismtpd0006p1maa1.sendgrid.net (SG) with ESMTP id xq--UUPxQyW0VKvCYvPv_w Tue, 25 Aug 2020 20:10:39.798 +0000 (UTC) From: Umang Jain Date: Tue, 25 Aug 2020 20:10:40 +0000 (UTC) Message-Id: <20200825201035.13553-1-email@uajain.com> Mime-Version: 1.0 X-SG-EID: 1Q40EQ7YGir8a9gjSIAdTjhngY657NMk9ckeo4dbHZDiOpywc/L3L9rFqlwE4KPcw8DXVBj03b84G8OPZYg80wMKQbpvPfpEOZNY4uwW0elLPjQnFV/+9q+UQgnnbh0oo+2YMdSlQWSyt//1t0t7Mla8fWzM+kbDP71pudGVI3jN6K91Z8EKqZdPNDGTEvqoOPPsdUlFJ32gFHfyWD+xIa6YsfNoCPFkvmfz9akVPEm3/xO/eB581EghPckcB1xgWDHQSBqG45yryOlTkzWPFw== To: libcamera-devel@lists.libcamera.org Subject: [libcamera-devel] [PATCH v2 1/2] libcamera: android: Add EXIF infrastructure X-BeenThere: libcamera-devel@lists.libcamera.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: libcamera-devel-bounces@lists.libcamera.org Sender: "libcamera-devel" From: Kieran Bingham Provide helper classes to utilise the libexif interfaces and link against libexif to support tag additions when creating JPEG images. Signed-off-by: Kieran Bingham Signed-off-by: Umang Jain --- src/android/jpeg/exif.cpp | 176 ++++++++++++++++++++++++++++++++++++++ src/android/jpeg/exif.h | 45 ++++++++++ src/android/meson.build | 2 + 3 files changed, 223 insertions(+) create mode 100644 src/android/jpeg/exif.cpp create mode 100644 src/android/jpeg/exif.h diff --git a/src/android/jpeg/exif.cpp b/src/android/jpeg/exif.cpp new file mode 100644 index 0000000..f6a9f5c --- /dev/null +++ b/src/android/jpeg/exif.cpp @@ -0,0 +1,176 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) 2020, Google Inc. + * + * exif.cpp - EXIF tag creation and parser using libexif + */ + +#include "exif.h" + +#include "libcamera/internal/log.h" + +using namespace libcamera; + +LOG_DEFINE_CATEGORY(EXIF) + +Exif::Exif() + : valid_(false), exif_data_(0), size_(0) +{ + /* Create an ExifMem allocator to construct entries. */ + mem_ = exif_mem_new_default(); + if (!mem_) { + LOG(EXIF, Fatal) << "Failed to allocate ExifMem Allocator"; + return; + } + + data_ = exif_data_new_mem(mem_); + if (!data_) { + LOG(EXIF, Fatal) << "Failed to allocate an ExifData structure"; + return; + } + + valid_ = true; + + exif_data_set_option(data_, EXIF_DATA_OPTION_FOLLOW_SPECIFICATION); + exif_data_set_data_type(data_, EXIF_DATA_TYPE_COMPRESSED); + + /* + * Big-Endian: EXIF_BYTE_ORDER_MOTOROLA + * Little Endian: EXIF_BYTE_ORDER_INTEL + */ + exif_data_set_byte_order(data_, EXIF_BYTE_ORDER_INTEL); + + /* Create the mandatory EXIF fields with default data */ + exif_data_fix(data_); +} + +Exif::~Exif() +{ + if (exif_data_) + free(exif_data_); + + if (data_) + exif_data_unref(data_); + + if (mem_) + exif_mem_unref(mem_); +} + +ExifEntry *Exif::createEntry(ExifIfd ifd, ExifTag tag) +{ + ExifContent *content = data_->ifd[ifd]; + ExifEntry *entry = exif_content_get_entry(content, tag); + + if (entry) { + exif_entry_ref(entry); + return entry; + } + + entry = exif_entry_new_mem(mem_); + if (!entry) { + LOG(EXIF, Fatal) << "Failed to allocated new entry"; + return nullptr; + } + + entry->tag = tag; + + exif_content_add_entry(content, entry); + exif_entry_initialize(entry, tag); + + return entry; +} + +ExifEntry *Exif::createEntry(ExifIfd ifd, ExifTag tag, ExifFormat format, + uint64_t components, unsigned int size) +{ + ExifContent *content = data_->ifd[ifd]; + + /* Replace any existing entry with the same tag. */ + ExifEntry *existing = exif_content_get_entry(content, tag); + exif_content_remove_entry(content, existing); + + ExifEntry *entry = exif_entry_new_mem(mem_); + if (!entry) { + LOG(EXIF, Fatal) << "Failed to allocated new entry"; + return nullptr; + } + + void *buffer = exif_mem_alloc(mem_, size); + if (!buffer) { + LOG(EXIF, Fatal) << "Failed to allocate buffer for variable entry"; + exif_mem_unref(mem_); + return nullptr; + } + + entry->data = static_cast(buffer); + entry->components = components; + entry->format = format; + entry->size = size; + entry->tag = tag; + + exif_content_add_entry(content, entry); + + return entry; +} + +int Exif::setShort(ExifIfd ifd, ExifTag tag, uint16_t item) +{ + ExifEntry *entry = createEntry(ifd, tag); + + exif_set_short(entry->data, EXIF_BYTE_ORDER_INTEL, item); + exif_entry_unref(entry); + + return 0; +} + +int Exif::setLong(ExifIfd ifd, ExifTag tag, uint32_t item) +{ + ExifEntry *entry = createEntry(ifd, tag); + + exif_set_long(entry->data, EXIF_BYTE_ORDER_INTEL, item); + exif_entry_unref(entry); + + return 0; +} + +int Exif::setRational(ExifIfd ifd, ExifTag tag, uint32_t numerator, uint32_t denominator) +{ + ExifEntry *entry = createEntry(ifd, tag); + ExifRational item{ numerator, denominator }; + + exif_set_rational(entry->data, EXIF_BYTE_ORDER_INTEL, item); + exif_entry_unref(entry); + + return 0; +} + +int Exif::setString(ExifIfd ifd, ExifTag tag, ExifFormat format, const std::string &item) +{ + size_t length = item.length(); + + ExifEntry *entry = createEntry(ifd, tag, format, length, length); + if (!entry) { + LOG(EXIF, Error) << "Failed to add tag: " << tag; + return -ENOMEM; + } + + memcpy(entry->data, item.c_str(), length); + exif_entry_unref(entry); + + return 0; +} + +Span Exif::generate() +{ + if (exif_data_) { + free(exif_data_); + exif_data_ = nullptr; + } + + exif_data_save_data(data_, &exif_data_, &size_); + + LOG(EXIF, Debug) << "Created EXIF instance (" << size_ << " bytes)"; + + return { exif_data_, size_ }; +} + diff --git a/src/android/jpeg/exif.h b/src/android/jpeg/exif.h new file mode 100644 index 0000000..7df83c7 --- /dev/null +++ b/src/android/jpeg/exif.h @@ -0,0 +1,45 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) 2020, Google Inc. + * + * exif.h - EXIF tag creator and parser using libexif + */ +#ifndef __LIBCAMERA_EXIF_H__ +#define __LIBCAMERA_EXIF_H__ + +#include + +#include + +#include + +class Exif +{ +public: + Exif(); + ~Exif(); + + int setShort(ExifIfd ifd, ExifTag tag, uint16_t item); + int setLong(ExifIfd ifd, ExifTag tag, uint32_t item); + int setString(ExifIfd ifd, ExifTag tag, ExifFormat format, const std::string &item); + int setRational(ExifIfd ifd, ExifTag tag, uint32_t numerator, uint32_t denominator); + + libcamera::Span generate(); + unsigned char *data() const { return exif_data_; } + unsigned int size() const { return size_; } + +private: + ExifEntry *createEntry(ExifIfd ifd, ExifTag tag); + ExifEntry *createEntry(ExifIfd ifd, ExifTag tag, ExifFormat format, + uint64_t components, unsigned int size); + + bool valid_; + + ExifData *data_; + ExifMem *mem_; + + unsigned char *exif_data_; + unsigned int size_; +}; + +#endif /* __LIBCAMERA_EXIF_H__ */ diff --git a/src/android/meson.build b/src/android/meson.build index f7b81a4..0f49b25 100644 --- a/src/android/meson.build +++ b/src/android/meson.build @@ -7,6 +7,7 @@ android_hal_sources = files([ 'camera_metadata.cpp', 'camera_ops.cpp', 'jpeg/encoder_libjpeg.cpp', + 'jpeg/exif.cpp', ]) android_camera_metadata_sources = files([ @@ -15,6 +16,7 @@ android_camera_metadata_sources = files([ android_deps = [ dependency('libjpeg'), + dependency('libexif'), ] android_camera_metadata = static_library('camera_metadata',