Metadata.cpp revision 046205c058ab70be78163ebcacfdc344a7f8750a 
1/*
2 * Copyright (C) 2015 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17//#define LOG_NDEBUG 0
18#define LOG_TAG "Metadata"
19#include <cutils/log.h>
20
21#include <system/camera_metadata.h>
22
23#define ATRACE_TAG (ATRACE_TAG_CAMERA | ATRACE_TAG_HAL)
24#include <utils/Trace.h>
25
26#include "Metadata.h"
27
28namespace usb_camera_hal {
29
30Metadata::Metadata():
31    mData(NULL) {
32}
33
34Metadata::~Metadata() {
35    replace(NULL);
36}
37
38void Metadata::replace(camera_metadata_t *m) {
39    if (m == mData) {
40        return;
41    }
42    if (mData)
43        free_camera_metadata(mData);
44    mData = m;
45}
46
47int Metadata::init(const camera_metadata_t *metadata) {
48    camera_metadata_t* tmp;
49
50    if (!validate_camera_metadata_structure(metadata, NULL))
51        return -EINVAL;
52
53    tmp = clone_camera_metadata(metadata);
54    if (tmp == NULL)
55        return -EINVAL;
56
57    replace(tmp);
58    return 0;
59}
60
61int Metadata::addUInt8(uint32_t tag, int count, const uint8_t *data) {
62    if (!validate(tag, TYPE_BYTE, count)) return -EINVAL;
63    return add(tag, count, data);
64}
65
66int Metadata::add1UInt8(uint32_t tag, const uint8_t data) {
67    return addUInt8(tag, 1, &data);
68}
69
70int Metadata::addInt32(uint32_t tag, int count, const int32_t *data) {
71    if (!validate(tag, TYPE_INT32, count)) return -EINVAL;
72    return add(tag, count, data);
73}
74
75int Metadata::addFloat(uint32_t tag, int count, const float *data) {
76    if (!validate(tag, TYPE_FLOAT, count)) return -EINVAL;
77    return add(tag, count, data);
78}
79
80int Metadata::addInt64(uint32_t tag, int count, const int64_t *data) {
81    if (!validate(tag, TYPE_INT64, count)) return -EINVAL;
82    return add(tag, count, data);
83}
84
85int Metadata::addDouble(uint32_t tag, int count, const double *data) {
86    if (!validate(tag, TYPE_DOUBLE, count)) return -EINVAL;
87    return add(tag, count, data);
88}
89
90int Metadata::addRational(uint32_t tag, int count,
91        const camera_metadata_rational_t *data) {
92    if (!validate(tag, TYPE_RATIONAL, count)) return -EINVAL;
93    return add(tag, count, data);
94}
95
96bool Metadata::validate(uint32_t tag, int tag_type, int count) {
97    if (get_camera_metadata_tag_type(tag) < 0) {
98        ALOGE("%s: Invalid metadata entry tag: %d", __func__, tag);
99        return false;
100    }
101    if (tag_type < 0 || tag_type >= NUM_TYPES) {
102        ALOGE("%s: Invalid metadata entry tag type: %d", __func__, tag_type);
103        return false;
104    }
105    if (tag_type != get_camera_metadata_tag_type(tag)) {
106        ALOGE("%s: Tag %d called with incorrect type: %s(%d)", __func__, tag,
107                camera_metadata_type_names[tag_type], tag_type);
108        return false;
109    }
110    if (count < 1) {
111        ALOGE("%s: Invalid metadata entry count: %d", __func__, count);
112        return false;
113    }
114    return true;
115}
116
117int Metadata::add(uint32_t tag, int count, const void *tag_data) {
118    // Opportunistically attempt to add if metadata has room for it
119    if (!add_camera_metadata_entry(mData, tag, tag_data, count)) {
120        return 0;
121    }
122
123    int res;
124    camera_metadata_t* tmp;
125    int tag_type = get_camera_metadata_tag_type(tag);
126    size_t size = calculate_camera_metadata_entry_data_size(tag_type, count);
127    size_t entry_capacity = get_camera_metadata_entry_count(mData) + 1;
128    size_t data_capacity = get_camera_metadata_data_count(mData) + size;
129
130    // Double new dimensions to minimize future reallocations
131    tmp = allocate_camera_metadata(entry_capacity * 2, data_capacity * 2);
132    if (tmp == NULL) {
133        ALOGE("%s: Failed to allocate new metadata with %zu entries, %zu data",
134                __func__, entry_capacity, data_capacity);
135        return -ENOMEM;
136    }
137    // Append the current metadata to the new (empty) metadata
138    res = append_camera_metadata(tmp, mData);
139    if (res) {
140        ALOGE("%s: Failed to append old metadata %p to new %p",
141                __func__, mData, tmp);
142        return res;
143    }
144    // Add the remaining new item
145    res = add_camera_metadata_entry(tmp, tag, tag_data, count);
146    if (res) {
147        ALOGE("%s: Failed to add new entry (%d, %p, %d) to metadata %p",
148                __func__, tag, tag_data, count, tmp);
149        return res;
150    }
151
152    replace(tmp);
153    return 0;
154}
155
156camera_metadata_t* Metadata::get() {
157    return mData;
158}
159
160} // namespace usb_camera_hal
161