camera2: Adding TIFF writing utilities.
Adds a native image utilities library with support for:
- Writing TIFF 6.0 and TIFF EP compliant file headers.
- Additional tags defined in EXIF 2.3 and DNG 1.4 specs.
Change-Id: I7a4fef74bd5254d92baf08a3cf61af5de1b7ca83
diff --git a/media/img_utils/src/TiffIfd.cpp b/media/img_utils/src/TiffIfd.cpp
new file mode 100644
index 0000000..b75309b
--- /dev/null
+++ b/media/img_utils/src/TiffIfd.cpp
@@ -0,0 +1,182 @@
+/*
+ * Copyright 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <img_utils/TiffIfd.h>
+#include <img_utils/TiffHelpers.h>
+
+#include <utils/Log.h>
+
+namespace android {
+namespace img_utils {
+
+TiffIfd::TiffIfd(uint32_t ifdId)
+ : mNextIfd(), mIfdId(ifdId) {}
+
+TiffIfd::~TiffIfd() {}
+
+status_t TiffIfd::addEntry(const sp<TiffEntry>& entry) {
+ size_t size = mEntries.size();
+ if (size >= MAX_IFD_ENTRIES) {
+ ALOGW("%s: Failed to add entry for tag 0x%x to IFD %d, too many entries in IFD!",
+ __FUNCTION__, entry->getTag(), mIfdId);
+ return BAD_INDEX;
+ }
+
+ if (mEntries.add(entry) < 0) {
+ ALOGW("%s: Failed to add entry for tag 0x%x to ifd %d.", __FUNCTION__, entry->getTag(),
+ mIfdId);
+ return BAD_INDEX;
+ }
+ return OK;
+}
+
+sp<TiffEntry> TiffIfd::getEntry(uint16_t tag) const {
+ ssize_t index = mEntries.indexOfTag(tag);
+ if (index < 0) {
+ ALOGW("%s: No entry for tag 0x%x in ifd %d.", __FUNCTION__, tag, mIfdId);
+ return NULL;
+ }
+ return mEntries[index];
+}
+
+void TiffIfd::setNextIfd(const sp<TiffIfd>& ifd) {
+ mNextIfd = ifd;
+}
+
+sp<TiffIfd> TiffIfd::getNextIfd() const {
+ return mNextIfd;
+}
+
+uint32_t TiffIfd::checkAndGetOffset(uint32_t offset) const {
+ size_t size = mEntries.size();
+
+ if (size > MAX_IFD_ENTRIES) {
+ ALOGW("%s: Could not calculate IFD offsets, IFD %d contains too many entries.",
+ __FUNCTION__, mIfdId);
+ return BAD_OFFSET;
+ }
+
+ if (size <= 0) {
+ ALOGW("%s: Could not calculate IFD offsets, IFD %d contains no entries.", __FUNCTION__,
+ mIfdId);
+ return BAD_OFFSET;
+ }
+
+ if (offset == BAD_OFFSET) {
+ ALOGW("%s: Could not calculate IFD offsets, IFD %d had a bad initial offset.",
+ __FUNCTION__, mIfdId);
+ return BAD_OFFSET;
+ }
+
+ uint32_t ifdSize = calculateIfdSize(size);
+ WORD_ALIGN(ifdSize);
+ return offset + ifdSize;
+}
+
+status_t TiffIfd::writeData(uint32_t offset, /*out*/EndianOutput* out) const {
+ assert((offset % TIFF_WORD_SIZE) == 0);
+ status_t ret = OK;
+
+ ALOGV("%s: IFD %u written to offset %u", __FUNCTION__, mIfdId, offset );
+ uint32_t valueOffset = checkAndGetOffset(offset);
+ if (valueOffset == 0) {
+ return BAD_VALUE;
+ }
+
+ size_t size = mEntries.size();
+
+ // Writer IFD header (2 bytes, number of entries).
+ uint16_t header = static_cast<uint16_t>(size);
+ BAIL_ON_FAIL(out->write(&header, 0, 1), ret);
+
+ // Write tag entries
+ for (size_t i = 0; i < size; ++i) {
+ BAIL_ON_FAIL(mEntries[i]->writeTagInfo(valueOffset, out), ret);
+ valueOffset += mEntries[i]->getSize();
+ }
+
+ // Writer IFD footer (4 bytes, offset to next IFD).
+ uint32_t footer = (mNextIfd != NULL) ? offset + getSize() : 0;
+ BAIL_ON_FAIL(out->write(&footer, 0, 1), ret);
+
+ assert(out->getCurrentOffset() == offset + calculateIfdSize(size));
+
+ // Write zeroes till word aligned
+ ZERO_TILL_WORD(out, calculateIfdSize(size), ret);
+
+ // Write values for each tag entry
+ for (size_t i = 0; i < size; ++i) {
+ size_t last = out->getCurrentOffset();
+ // Only write values that are too large to fit in the 12-byte TIFF entry
+ if (mEntries[i]->getSize() > OFFSET_SIZE) {
+ BAIL_ON_FAIL(mEntries[i]->writeData(out->getCurrentOffset(), out), ret);
+ }
+ size_t next = out->getCurrentOffset();
+ size_t diff = (next - last);
+ size_t actual = mEntries[i]->getSize();
+ if (diff != actual) {
+ ALOGW("Sizes do not match for tag %x. Expected %d, received %d",
+ mEntries[i]->getTag(), actual, diff);
+ }
+ }
+
+ assert(out->getCurrentOffset() == offset + getSize());
+
+ return ret;
+}
+
+uint32_t TiffIfd::getSize() const {
+ size_t size = mEntries.size();
+ uint32_t total = calculateIfdSize(size);
+ WORD_ALIGN(total);
+ for (size_t i = 0; i < size; ++i) {
+ total += mEntries[i]->getSize();
+ }
+ return total;
+}
+
+uint32_t TiffIfd::getId() const {
+ return mIfdId;
+}
+
+uint32_t TiffIfd::getComparableValue() const {
+ return mIfdId;
+}
+
+String8 TiffIfd::toString() const {
+ size_t s = mEntries.size();
+ String8 output;
+ output.appendFormat("[ifd: %x, num_entries: %u, entries:\n", getId(), s);
+ for(size_t i = 0; i < mEntries.size(); ++i) {
+ output.append("\t");
+ output.append(mEntries[i]->toString());
+ output.append("\n");
+ }
+ output.append(", next_ifd: %x]", ((mNextIfd != NULL) ? mNextIfd->getId() : 0));
+ return output;
+}
+
+void TiffIfd::log() const {
+ size_t s = mEntries.size();
+ ALOGI("[ifd: %x, num_entries: %u, entries:\n", getId(), s);
+ for(size_t i = 0; i < s; ++i) {
+ ALOGI("\t%s", mEntries[i]->toString().string());
+ }
+ ALOGI(", next_ifd: %x]", ((mNextIfd != NULL) ? mNextIfd->getId() : 0));
+}
+
+} /*namespace img_utils*/
+} /*namespace android*/