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android13/frameworks/av/camera/CameraMetadata.cpp

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/*
* Copyright (C) 2012 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.
*/
// #define LOG_NDEBUG 0
#define LOG_TAG "Camera2-Metadata"
#include <utils/Log.h>
#include <utils/Errors.h>
#include <binder/Parcel.h>
#include <camera/CameraMetadata.h>
#include <camera_metadata_hidden.h>
namespace android {
#define ALIGN_TO(val, alignment) \
(((uintptr_t)(val) + ((alignment) - 1)) & ~((alignment) - 1))
typedef Parcel::WritableBlob WritableBlob;
typedef Parcel::ReadableBlob ReadableBlob;
CameraMetadata::CameraMetadata() :
mBuffer(NULL), mLocked(false) {
}
CameraMetadata::CameraMetadata(size_t entryCapacity, size_t dataCapacity) :
mLocked(false)
{
mBuffer = allocate_camera_metadata(entryCapacity, dataCapacity);
}
CameraMetadata::CameraMetadata(const CameraMetadata &other) :
mLocked(false) {
mBuffer = clone_camera_metadata(other.mBuffer);
}
CameraMetadata::CameraMetadata(CameraMetadata &&other) :mBuffer(NULL), mLocked(false) {
acquire(other);
}
CameraMetadata &CameraMetadata::operator=(CameraMetadata &&other) {
acquire(other);
return *this;
}
CameraMetadata::CameraMetadata(camera_metadata_t *buffer) :
mBuffer(NULL), mLocked(false) {
acquire(buffer);
}
CameraMetadata &CameraMetadata::operator=(const CameraMetadata &other) {
return operator=(other.mBuffer);
}
CameraMetadata &CameraMetadata::operator=(const camera_metadata_t *buffer) {
if (mLocked) {
ALOGE("%s: Assignment to a locked CameraMetadata!", __FUNCTION__);
return *this;
}
if (CC_LIKELY(buffer != mBuffer)) {
camera_metadata_t *newBuffer = clone_camera_metadata(buffer);
clear();
mBuffer = newBuffer;
}
return *this;
}
CameraMetadata::~CameraMetadata() {
mLocked = false;
clear();
}
const camera_metadata_t* CameraMetadata::getAndLock() const {
mLocked = true;
return mBuffer;
}
status_t CameraMetadata::unlock(const camera_metadata_t *buffer) const {
if (!mLocked) {
ALOGE("%s: Can't unlock a non-locked CameraMetadata!", __FUNCTION__);
return INVALID_OPERATION;
}
if (buffer != mBuffer) {
ALOGE("%s: Can't unlock CameraMetadata with wrong pointer!",
__FUNCTION__);
return BAD_VALUE;
}
mLocked = false;
return OK;
}
camera_metadata_t* CameraMetadata::release() {
if (mLocked) {
ALOGE("%s: CameraMetadata is locked", __FUNCTION__);
return NULL;
}
camera_metadata_t *released = mBuffer;
mBuffer = NULL;
return released;
}
void CameraMetadata::clear() {
if (mLocked) {
ALOGE("%s: CameraMetadata is locked", __FUNCTION__);
return;
}
if (mBuffer) {
free_camera_metadata(mBuffer);
mBuffer = NULL;
}
}
void CameraMetadata::acquire(camera_metadata_t *buffer) {
if (mLocked) {
ALOGE("%s: CameraMetadata is locked", __FUNCTION__);
return;
}
clear();
mBuffer = buffer;
ALOGE_IF(validate_camera_metadata_structure(mBuffer, /*size*/NULL) != OK,
"%s: Failed to validate metadata structure %p",
__FUNCTION__, buffer);
}
void CameraMetadata::acquire(CameraMetadata &other) {
if (mLocked) {
ALOGE("%s: CameraMetadata is locked", __FUNCTION__);
return;
}
acquire(other.release());
}
status_t CameraMetadata::append(const CameraMetadata &other) {
return append(other.mBuffer);
}
status_t CameraMetadata::append(const camera_metadata_t* other) {
if (mLocked) {
ALOGE("%s: CameraMetadata is locked", __FUNCTION__);
return INVALID_OPERATION;
}
size_t extraEntries = get_camera_metadata_entry_count(other);
size_t extraData = get_camera_metadata_data_count(other);
resizeIfNeeded(extraEntries, extraData);
return append_camera_metadata(mBuffer, other);
}
size_t CameraMetadata::entryCount() const {
return (mBuffer == NULL) ? 0 :
get_camera_metadata_entry_count(mBuffer);
}
bool CameraMetadata::isEmpty() const {
return entryCount() == 0;
}
size_t CameraMetadata::bufferSize() const {
return (mBuffer == NULL) ? 0 :
get_camera_metadata_size(mBuffer);
}
status_t CameraMetadata::sort() {
if (mLocked) {
ALOGE("%s: CameraMetadata is locked", __FUNCTION__);
return INVALID_OPERATION;
}
return sort_camera_metadata(mBuffer);
}
status_t CameraMetadata::checkType(uint32_t tag, uint8_t expectedType) {
int tagType = get_local_camera_metadata_tag_type(tag, mBuffer);
if ( CC_UNLIKELY(tagType == -1)) {
ALOGE("Update metadata entry: Unknown tag %d", tag);
return INVALID_OPERATION;
}
if ( CC_UNLIKELY(tagType != expectedType) ) {
ALOGE("Mismatched tag type when updating entry %s (%d) of type %s; "
"got type %s data instead ",
get_local_camera_metadata_tag_name(tag, mBuffer), tag,
camera_metadata_type_names[tagType],
camera_metadata_type_names[expectedType]);
return INVALID_OPERATION;
}
return OK;
}
status_t CameraMetadata::update(uint32_t tag,
const int32_t *data, size_t data_count) {
status_t res;
if (mLocked) {
ALOGE("%s: CameraMetadata is locked", __FUNCTION__);
return INVALID_OPERATION;
}
if ( (res = checkType(tag, TYPE_INT32)) != OK) {
return res;
}
return updateImpl(tag, (const void*)data, data_count);
}
status_t CameraMetadata::update(uint32_t tag,
const uint8_t *data, size_t data_count) {
status_t res;
if (mLocked) {
ALOGE("%s: CameraMetadata is locked", __FUNCTION__);
return INVALID_OPERATION;
}
if ( (res = checkType(tag, TYPE_BYTE)) != OK) {
return res;
}
return updateImpl(tag, (const void*)data, data_count);
}
status_t CameraMetadata::update(uint32_t tag,
const float *data, size_t data_count) {
status_t res;
if (mLocked) {
ALOGE("%s: CameraMetadata is locked", __FUNCTION__);
return INVALID_OPERATION;
}
if ( (res = checkType(tag, TYPE_FLOAT)) != OK) {
return res;
}
return updateImpl(tag, (const void*)data, data_count);
}
status_t CameraMetadata::update(uint32_t tag,
const int64_t *data, size_t data_count) {
status_t res;
if (mLocked) {
ALOGE("%s: CameraMetadata is locked", __FUNCTION__);
return INVALID_OPERATION;
}
if ( (res = checkType(tag, TYPE_INT64)) != OK) {
return res;
}
return updateImpl(tag, (const void*)data, data_count);
}
status_t CameraMetadata::update(uint32_t tag,
const double *data, size_t data_count) {
status_t res;
if (mLocked) {
ALOGE("%s: CameraMetadata is locked", __FUNCTION__);
return INVALID_OPERATION;
}
if ( (res = checkType(tag, TYPE_DOUBLE)) != OK) {
return res;
}
return updateImpl(tag, (const void*)data, data_count);
}
status_t CameraMetadata::update(uint32_t tag,
const camera_metadata_rational_t *data, size_t data_count) {
status_t res;
if (mLocked) {
ALOGE("%s: CameraMetadata is locked", __FUNCTION__);
return INVALID_OPERATION;
}
if ( (res = checkType(tag, TYPE_RATIONAL)) != OK) {
return res;
}
return updateImpl(tag, (const void*)data, data_count);
}
status_t CameraMetadata::update(uint32_t tag,
const String8 &string) {
status_t res;
if (mLocked) {
ALOGE("%s: CameraMetadata is locked", __FUNCTION__);
return INVALID_OPERATION;
}
if ( (res = checkType(tag, TYPE_BYTE)) != OK) {
return res;
}
// string.size() doesn't count the null termination character.
return updateImpl(tag, (const void*)string.string(), string.size() + 1);
}
status_t CameraMetadata::update(const camera_metadata_ro_entry &entry) {
status_t res;
if (mLocked) {
ALOGE("%s: CameraMetadata is locked", __FUNCTION__);
return INVALID_OPERATION;
}
if ( (res = checkType(entry.tag, entry.type)) != OK) {
return res;
}
return updateImpl(entry.tag, (const void*)entry.data.u8, entry.count);
}
status_t CameraMetadata::updateImpl(uint32_t tag, const void *data,
size_t data_count) {
status_t res;
if (mLocked) {
ALOGE("%s: CameraMetadata is locked", __FUNCTION__);
return INVALID_OPERATION;
}
int type = get_local_camera_metadata_tag_type(tag, mBuffer);
if (type == -1) {
ALOGE("%s: Tag %d not found", __FUNCTION__, tag);
return BAD_VALUE;
}
// Safety check - ensure that data isn't pointing to this metadata, since
// that would get invalidated if a resize is needed
size_t bufferSize = get_camera_metadata_size(mBuffer);
uintptr_t bufAddr = reinterpret_cast<uintptr_t>(mBuffer);
uintptr_t dataAddr = reinterpret_cast<uintptr_t>(data);
if (dataAddr > bufAddr && dataAddr < (bufAddr + bufferSize)) {
ALOGE("%s: Update attempted with data from the same metadata buffer!",
__FUNCTION__);
return INVALID_OPERATION;
}
size_t data_size = calculate_camera_metadata_entry_data_size(type,
data_count);
res = resizeIfNeeded(1, data_size);
if (res == OK) {
camera_metadata_entry_t entry;
res = find_camera_metadata_entry(mBuffer, tag, &entry);
if (res == NAME_NOT_FOUND) {
res = add_camera_metadata_entry(mBuffer,
tag, data, data_count);
} else if (res == OK) {
res = update_camera_metadata_entry(mBuffer,
entry.index, data, data_count, NULL);
}
}
if (res != OK) {
ALOGE("%s: Unable to update metadata entry %s.%s (%x): %s (%d)",
__FUNCTION__, get_local_camera_metadata_section_name(tag, mBuffer),
get_local_camera_metadata_tag_name(tag, mBuffer), tag,
strerror(-res), res);
}
IF_ALOGV() {
ALOGE_IF(validate_camera_metadata_structure(mBuffer, /*size*/NULL) !=
OK,
"%s: Failed to validate metadata structure after update %p",
__FUNCTION__, mBuffer);
}
return res;
}
bool CameraMetadata::exists(uint32_t tag) const {
camera_metadata_ro_entry entry;
return find_camera_metadata_ro_entry(mBuffer, tag, &entry) == 0;
}
camera_metadata_entry_t CameraMetadata::find(uint32_t tag) {
status_t res;
camera_metadata_entry entry;
if (mLocked) {
ALOGE("%s: CameraMetadata is locked", __FUNCTION__);
entry.count = 0;
return entry;
}
res = find_camera_metadata_entry(mBuffer, tag, &entry);
if (CC_UNLIKELY( res != OK )) {
entry.count = 0;
entry.data.u8 = NULL;
}
return entry;
}
camera_metadata_ro_entry_t CameraMetadata::find(uint32_t tag) const {
status_t res;
camera_metadata_ro_entry entry;
res = find_camera_metadata_ro_entry(mBuffer, tag, &entry);
if (CC_UNLIKELY( res != OK )) {
entry.count = 0;
entry.data.u8 = NULL;
}
return entry;
}
status_t CameraMetadata::erase(uint32_t tag) {
camera_metadata_entry_t entry;
status_t res;
if (mLocked) {
ALOGE("%s: CameraMetadata is locked", __FUNCTION__);
return INVALID_OPERATION;
}
res = find_camera_metadata_entry(mBuffer, tag, &entry);
if (res == NAME_NOT_FOUND) {
return OK;
} else if (res != OK) {
ALOGE("%s: Error looking for entry %s.%s (%x): %s %d",
__FUNCTION__,
get_local_camera_metadata_section_name(tag, mBuffer),
get_local_camera_metadata_tag_name(tag, mBuffer),
tag, strerror(-res), res);
return res;
}
res = delete_camera_metadata_entry(mBuffer, entry.index);
if (res != OK) {
ALOGE("%s: Error deleting entry %s.%s (%x): %s %d",
__FUNCTION__,
get_local_camera_metadata_section_name(tag, mBuffer),
get_local_camera_metadata_tag_name(tag, mBuffer),
tag, strerror(-res), res);
}
return res;
}
status_t CameraMetadata::removePermissionEntries(metadata_vendor_id_t vendorId,
std::vector<int32_t> *tagsRemoved) {
uint32_t tagCount = 0;
std::vector<uint32_t> tagsToRemove;
if (tagsRemoved == nullptr) {
return BAD_VALUE;
}
sp<VendorTagDescriptor> vTags = VendorTagDescriptor::getGlobalVendorTagDescriptor();
if ((nullptr == vTags.get()) || (0 >= vTags->getTagCount())) {
sp<VendorTagDescriptorCache> cache =
VendorTagDescriptorCache::getGlobalVendorTagCache();
if (cache.get()) {
cache->getVendorTagDescriptor(vendorId, &vTags);
}
}
if ((nullptr != vTags.get()) && (vTags->getTagCount() > 0)) {
tagCount = vTags->getTagCount();
uint32_t *vendorTags = new uint32_t[tagCount];
if (nullptr == vendorTags) {
return NO_MEMORY;
}
vTags->getTagArray(vendorTags);
tagsToRemove.reserve(tagCount);
tagsToRemove.insert(tagsToRemove.begin(), vendorTags, vendorTags + tagCount);
delete [] vendorTags;
tagCount = 0;
}
auto tagsNeedingPermission = get_camera_metadata_permission_needed(&tagCount);
if (tagCount > 0) {
tagsToRemove.reserve(tagsToRemove.capacity() + tagCount);
tagsToRemove.insert(tagsToRemove.end(), tagsNeedingPermission,
tagsNeedingPermission + tagCount);
}
tagsRemoved->reserve(tagsToRemove.size());
for (const auto &it : tagsToRemove) {
if (exists(it)) {
auto rc = erase(it);
if (NO_ERROR != rc) {
ALOGE("%s: Failed to erase tag: %x", __func__, it);
return rc;
}
tagsRemoved->push_back(it);
}
}
// Update the available characterstics accordingly
if (exists(ANDROID_REQUEST_AVAILABLE_CHARACTERISTICS_KEYS)) {
std::vector<uint32_t> currentKeys;
std::sort(tagsRemoved->begin(), tagsRemoved->end());
auto keys = find(ANDROID_REQUEST_AVAILABLE_CHARACTERISTICS_KEYS);
currentKeys.reserve(keys.count);
currentKeys.insert(currentKeys.end(), keys.data.i32, keys.data.i32 + keys.count);
std::sort(currentKeys.begin(), currentKeys.end());
std::vector<int32_t> newKeys(keys.count);
auto end = std::set_difference(currentKeys.begin(), currentKeys.end(), tagsRemoved->begin(),
tagsRemoved->end(), newKeys.begin());
newKeys.resize(end - newKeys.begin());
update(ANDROID_REQUEST_AVAILABLE_CHARACTERISTICS_KEYS, newKeys.data(), newKeys.size());
}
return NO_ERROR;
}
void CameraMetadata::dump(int fd, int verbosity, int indentation) const {
dump_indented_camera_metadata(mBuffer, fd, verbosity, indentation);
}
status_t CameraMetadata::resizeIfNeeded(size_t extraEntries, size_t extraData) {
if (mBuffer == NULL) {
mBuffer = allocate_camera_metadata(extraEntries * 2, extraData * 2);
if (mBuffer == NULL) {
ALOGE("%s: Can't allocate larger metadata buffer", __FUNCTION__);
return NO_MEMORY;
}
} else {
size_t currentEntryCount = get_camera_metadata_entry_count(mBuffer);
size_t currentEntryCap = get_camera_metadata_entry_capacity(mBuffer);
size_t newEntryCount = currentEntryCount +
extraEntries;
newEntryCount = (newEntryCount > currentEntryCap) ?
newEntryCount * 2 : currentEntryCap;
size_t currentDataCount = get_camera_metadata_data_count(mBuffer);
size_t currentDataCap = get_camera_metadata_data_capacity(mBuffer);
size_t newDataCount = currentDataCount +
extraData;
newDataCount = (newDataCount > currentDataCap) ?
newDataCount * 2 : currentDataCap;
if (newEntryCount > currentEntryCap ||
newDataCount > currentDataCap) {
camera_metadata_t *oldBuffer = mBuffer;
mBuffer = allocate_camera_metadata(newEntryCount,
newDataCount);
if (mBuffer == NULL) {
// Maintain old buffer to avoid potential memory leak.
mBuffer = oldBuffer;
ALOGE("%s: Can't allocate larger metadata buffer", __FUNCTION__);
return NO_MEMORY;
}
append_camera_metadata(mBuffer, oldBuffer);
free_camera_metadata(oldBuffer);
}
}
return OK;
}
status_t CameraMetadata::readFromParcel(const Parcel& data,
camera_metadata_t** out) {
status_t err = OK;
camera_metadata_t* metadata = NULL;
if (out) {
*out = NULL;
}
// See CameraMetadata::writeToParcel for parcel data layout diagram and explanation.
// arg0 = blobSize (int32)
int32_t blobSizeTmp = -1;
if ((err = data.readInt32(&blobSizeTmp)) != OK) {
ALOGE("%s: Failed to read metadata size (error %d %s)",
__FUNCTION__, err, strerror(-err));
return err;
}
const size_t blobSize = static_cast<size_t>(blobSizeTmp);
const size_t alignment = get_camera_metadata_alignment();
// Special case: zero blob size means zero sized (NULL) metadata.
if (blobSize == 0) {
ALOGV("%s: Read 0-sized metadata", __FUNCTION__);
return OK;
}
if (blobSize <= alignment) {
ALOGE("%s: metadata blob is malformed, blobSize(%zu) should be larger than alignment(%zu)",
__FUNCTION__, blobSize, alignment);
return BAD_VALUE;
}
const size_t metadataSize = blobSize - alignment;
// NOTE: this doesn't make sense to me. shouldn't the blob
// know how big it is? why do we have to specify the size
// to Parcel::readBlob ?
ReadableBlob blob;
// arg1 = metadata (blob)
do {
if ((err = data.readBlob(blobSize, &blob)) != OK) {
ALOGE("%s: Failed to read metadata blob (sized %zu). Possible "
" serialization bug. Error %d %s",
__FUNCTION__, blobSize, err, strerror(-err));
break;
}
// arg2 = offset (blob)
// Must be after blob since we don't know offset until after writeBlob.
int32_t offsetTmp;
if ((err = data.readInt32(&offsetTmp)) != OK) {
ALOGE("%s: Failed to read metadata offsetTmp (error %d %s)",
__FUNCTION__, err, strerror(-err));
break;
}
const size_t offset = static_cast<size_t>(offsetTmp);
if (offset >= alignment) {
ALOGE("%s: metadata offset(%zu) should be less than alignment(%zu)",
__FUNCTION__, blobSize, alignment);
err = BAD_VALUE;
break;
}
const uintptr_t metadataStart = reinterpret_cast<uintptr_t>(blob.data()) + offset;
const camera_metadata_t* tmp =
reinterpret_cast<const camera_metadata_t*>(metadataStart);
ALOGV("%s: alignment is: %zu, metadata start: %p, offset: %zu",
__FUNCTION__, alignment, tmp, offset);
metadata = allocate_copy_camera_metadata_checked(tmp, metadataSize);
if (metadata == NULL) {
// We consider that allocation only fails if the validation
// also failed, therefore the readFromParcel was a failure.
ALOGE("%s: metadata allocation and copy failed", __FUNCTION__);
err = BAD_VALUE;
}
} while(0);
blob.release();
if (out) {
ALOGV("%s: Set out metadata to %p", __FUNCTION__, metadata);
*out = metadata;
} else if (metadata != NULL) {
ALOGV("%s: Freed camera metadata at %p", __FUNCTION__, metadata);
free_camera_metadata(metadata);
}
return err;
}
status_t CameraMetadata::writeToParcel(Parcel& data,
const camera_metadata_t* metadata) {
status_t res = OK;
/**
* Below is the camera metadata parcel layout:
*
* |--------------------------------------------|
* | arg0: blobSize |
* | (length = 4) |
* |--------------------------------------------|<--Skip the rest if blobSize == 0.
* | |
* | |
* | arg1: blob |
* | (length = variable, see arg1 layout below) |
* | |
* | |
* |--------------------------------------------|
* | arg2: offset |
* | (length = 4) |
* |--------------------------------------------|
*/
// arg0 = blobSize (int32)
if (metadata == NULL) {
// Write zero blobSize for null metadata.
return data.writeInt32(0);
}
/**
* Always make the blob size sufficiently larger, as we need put alignment
* padding and metadata into the blob. Since we don't know the alignment
* offset before writeBlob. Then write the metadata to aligned offset.
*/
const size_t metadataSize = get_camera_metadata_compact_size(metadata);
const size_t alignment = get_camera_metadata_alignment();
const size_t blobSize = metadataSize + alignment;
res = data.writeInt32(static_cast<int32_t>(blobSize));
if (res != OK) {
return res;
}
size_t offset = 0;
/**
* arg1 = metadata (blob).
*
* The blob size is the sum of front padding size, metadata size and back padding
* size, which is equal to metadataSize + alignment.
*
* The blob layout is:
* |------------------------------------|<----Start address of the blob (unaligned).
* | front padding |
* | (size = offset) |
* |------------------------------------|<----Aligned start address of metadata.
* | |
* | |
* | metadata |
* | (size = metadataSize) |
* | |
* | |
* |------------------------------------|
* | back padding |
* | (size = alignment - offset) |
* |------------------------------------|<----End address of blob.
* (Blob start address + blob size).
*/
WritableBlob blob;
do {
res = data.writeBlob(blobSize, false, &blob);
if (res != OK) {
break;
}
const uintptr_t metadataStart = ALIGN_TO(blob.data(), alignment);
offset = metadataStart - reinterpret_cast<uintptr_t>(blob.data());
ALOGV("%s: alignment is: %zu, metadata start: %p, offset: %zu",
__FUNCTION__, alignment,
reinterpret_cast<const void *>(metadataStart), offset);
copy_camera_metadata(reinterpret_cast<void*>(metadataStart), metadataSize, metadata);
// Not too big of a problem since receiving side does hard validation
// Don't check the size since the compact size could be larger
if (validate_camera_metadata_structure(metadata, /*size*/NULL) != OK) {
ALOGW("%s: Failed to validate metadata %p before writing blob",
__FUNCTION__, metadata);
}
} while(false);
blob.release();
// arg2 = offset (int32)
res = data.writeInt32(static_cast<int32_t>(offset));
return res;
}
status_t CameraMetadata::readFromParcel(const Parcel *parcel) {
ALOGV("%s: parcel = %p", __FUNCTION__, parcel);
status_t res = OK;
if (parcel == NULL) {
ALOGE("%s: parcel is null", __FUNCTION__);
return BAD_VALUE;
}
if (mLocked) {
ALOGE("%s: CameraMetadata is locked", __FUNCTION__);
return INVALID_OPERATION;
}
camera_metadata *buffer = NULL;
// TODO: reading should return a status code, in case validation fails
res = CameraMetadata::readFromParcel(*parcel, &buffer);
if (res != NO_ERROR) {
ALOGE("%s: Failed to read from parcel. Metadata is unchanged.",
__FUNCTION__);
return res;
}
clear();
mBuffer = buffer;
return OK;
}
status_t CameraMetadata::writeToParcel(Parcel *parcel) const {
ALOGV("%s: parcel = %p", __FUNCTION__, parcel);
if (parcel == NULL) {
ALOGE("%s: parcel is null", __FUNCTION__);
return BAD_VALUE;
}
return CameraMetadata::writeToParcel(*parcel, mBuffer);
}
void CameraMetadata::swap(CameraMetadata& other) {
if (mLocked) {
ALOGE("%s: CameraMetadata is locked", __FUNCTION__);
return;
} else if (other.mLocked) {
ALOGE("%s: Other CameraMetadata is locked", __FUNCTION__);
return;
}
camera_metadata* thisBuf = mBuffer;
camera_metadata* otherBuf = other.mBuffer;
other.mBuffer = thisBuf;
mBuffer = otherBuf;
}
status_t CameraMetadata::getTagFromName(const char *name,
const VendorTagDescriptor* vTags, uint32_t *tag) {
if (name == nullptr || tag == nullptr) return BAD_VALUE;
size_t nameLength = strlen(name);
const SortedVector<String8> *vendorSections;
size_t vendorSectionCount = 0;
if (vTags != NULL) {
vendorSections = vTags->getAllSectionNames();
vendorSectionCount = vendorSections->size();
}
// First, find the section by the longest string match
const char *section = NULL;
size_t sectionIndex = 0;
size_t sectionLength = 0;
size_t totalSectionCount = ANDROID_SECTION_COUNT + vendorSectionCount;
for (size_t i = 0; i < totalSectionCount; ++i) {
const char *str = (i < ANDROID_SECTION_COUNT) ? camera_metadata_section_names[i] :
(*vendorSections)[i - ANDROID_SECTION_COUNT].string();
ALOGV("%s: Trying to match against section '%s'", __FUNCTION__, str);
if (strstr(name, str) == name) { // name begins with the section name
size_t strLength = strlen(str);
ALOGV("%s: Name begins with section name", __FUNCTION__);
// section name is the longest we've found so far
if (section == NULL || sectionLength < strLength) {
section = str;
sectionIndex = i;
sectionLength = strLength;
ALOGV("%s: Found new best section (%s)", __FUNCTION__, section);
}
}
}
// TODO: Make above get_camera_metadata_section_from_name ?
if (section == NULL) {
return NAME_NOT_FOUND;
} else {
ALOGV("%s: Found matched section '%s' (%zu)",
__FUNCTION__, section, sectionIndex);
}
// Get the tag name component of the name
const char *nameTagName = name + sectionLength + 1; // x.y.z -> z
if (sectionLength + 1 >= nameLength) {
return BAD_VALUE;
}
// Match rest of name against the tag names in that section only
uint32_t candidateTag = 0;
if (sectionIndex < ANDROID_SECTION_COUNT) {
// Match built-in tags (typically android.*)
uint32_t tagBegin, tagEnd; // [tagBegin, tagEnd)
tagBegin = camera_metadata_section_bounds[sectionIndex][0];
tagEnd = camera_metadata_section_bounds[sectionIndex][1];
for (candidateTag = tagBegin; candidateTag < tagEnd; ++candidateTag) {
const char *tagName = get_camera_metadata_tag_name(candidateTag);
if (strcmp(nameTagName, tagName) == 0) {
ALOGV("%s: Found matched tag '%s' (%d)",
__FUNCTION__, tagName, candidateTag);
break;
}
}
if (candidateTag == tagEnd) {
return NAME_NOT_FOUND;
}
} else if (vTags != NULL) {
// Match vendor tags (typically com.*)
const String8 sectionName(section);
const String8 tagName(nameTagName);
status_t res = OK;
if ((res = vTags->lookupTag(tagName, sectionName, &candidateTag)) != OK) {
return NAME_NOT_FOUND;
}
}
*tag = candidateTag;
return OK;
}
metadata_vendor_id_t CameraMetadata::getVendorId() {
return get_camera_metadata_vendor_id(mBuffer);
}
}; // namespace android
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