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_camera_metadata_tag_type(tag);
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_camera_metadata_section_name(tag),
get_camera_metadata_tag_name(tag), 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;
}
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);
}
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_camera_metadata_tag_type(tag);
if (type == -1) {
ALOGE("%s: Tag %d not found", __FUNCTION__, tag);
return BAD_VALUE;
}
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_camera_metadata_section_name(tag),
get_camera_metadata_tag_name(tag), 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;
}
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, &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;
}