Metadata.cpp revision a82f456c387cb6ff6c5aab7c930a7a61c36ed8ba 
1/*
2 * Copyright (C) 2013 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#include <system/camera_metadata.h>
18
19//#define LOG_NDEBUG 0
20#define LOG_TAG "Metadata"
21#include <cutils/log.h>
22
23#define ATRACE_TAG (ATRACE_TAG_CAMERA | ATRACE_TAG_HAL)
24#include <utils/Trace.h>
25
26#include "Metadata.h"
27
28namespace default_camera_hal {
29
30Metadata::Metadata():
31    mData(NULL)
32{
33}
34
35Metadata::~Metadata()
36{
37    replace(NULL);
38}
39
40void Metadata::replace(camera_metadata_t *m)
41{
42    if (m == mData) {
43        ALOGE("%s: Replacing metadata with itself?!", __func__);
44        return;
45    }
46    if (mData)
47        free_camera_metadata(mData);
48    mData = m;
49}
50
51int Metadata::init(const camera_metadata_t *metadata)
52{
53    camera_metadata_t* tmp;
54
55    if (!validate_camera_metadata_structure(metadata, NULL))
56        return -EINVAL;
57
58    tmp = clone_camera_metadata(metadata);
59    if (tmp == NULL)
60        return -EINVAL;
61
62    replace(tmp);
63    return 0;
64}
65
66int Metadata::addUInt8(uint32_t tag, int count, const uint8_t *data)
67{
68    if (!validate(tag, TYPE_BYTE, count)) return -EINVAL;
69    return add(tag, count, data);
70}
71
72int Metadata::add1UInt8(uint32_t tag, const uint8_t data)
73{
74    return addUInt8(tag, 1, &data);
75}
76
77int Metadata::addInt32(uint32_t tag, int count, const int32_t *data)
78{
79    if (!validate(tag, TYPE_INT32, count)) return -EINVAL;
80    return add(tag, count, data);
81}
82
83int Metadata::addFloat(uint32_t tag, int count, const float *data)
84{
85    if (!validate(tag, TYPE_FLOAT, count)) return -EINVAL;
86    return add(tag, count, data);
87}
88
89int Metadata::addInt64(uint32_t tag, int count, const int64_t *data)
90{
91    if (!validate(tag, TYPE_INT64, count)) return -EINVAL;
92    return add(tag, count, data);
93}
94
95int Metadata::addDouble(uint32_t tag, int count, const double *data)
96{
97    if (!validate(tag, TYPE_DOUBLE, count)) return -EINVAL;
98    return add(tag, count, data);
99}
100
101int Metadata::addRational(uint32_t tag, int count,
102        const camera_metadata_rational_t *data)
103{
104    if (!validate(tag, TYPE_RATIONAL, count)) return -EINVAL;
105    return add(tag, count, data);
106}
107
108bool Metadata::validate(uint32_t tag, int tag_type, int count)
109{
110    if (get_camera_metadata_tag_type(tag) < 0) {
111        ALOGE("%s: Invalid metadata entry tag: %d", __func__, tag);
112        return false;
113    }
114    if (tag_type < 0 || tag_type >= NUM_TYPES) {
115        ALOGE("%s: Invalid metadata entry tag type: %d", __func__, tag_type);
116        return false;
117    }
118    if (tag_type != get_camera_metadata_tag_type(tag)) {
119        ALOGE("%s: Tag %d called with incorrect type: %s(%d)", __func__, tag,
120                camera_metadata_type_names[tag_type], tag_type);
121        return false;
122    }
123    if (count < 1) {
124        ALOGE("%s: Invalid metadata entry count: %d", __func__, count);
125        return false;
126    }
127    return true;
128}
129
130int Metadata::add(uint32_t tag, int count, const void *tag_data)
131{
132    int res;
133    camera_metadata_t* tmp;
134    int tag_type = get_camera_metadata_tag_type(tag);
135    size_t size = calculate_camera_metadata_entry_data_size(tag_type, count);
136    size_t entry_capacity = get_camera_metadata_entry_count(mData) + 1;
137    size_t data_capacity = get_camera_metadata_data_count(mData) + size;
138
139    // Opportunistically attempt to add if metadata has room for it
140    if (!add_camera_metadata_entry(mData, tag, tag_data, count))
141        return 0;
142
143    // Double new dimensions to minimize future reallocations
144    tmp = allocate_camera_metadata(entry_capacity * 2, data_capacity * 2);
145    if (tmp == NULL) {
146        ALOGE("%s: Failed to allocate new metadata with %zu entries, %zu data",
147                __func__, entry_capacity, data_capacity);
148        return -ENOMEM;
149    }
150    // Append the current metadata to the new (empty) metadata
151    res = append_camera_metadata(tmp, mData);
152    if (res) {
153        ALOGE("%s: Failed to append old metadata %p to new %p",
154                __func__, mData, tmp);
155        return res;
156    }
157    // Add the remaining new item
158    res = add_camera_metadata_entry(tmp, tag, tag_data, count);
159    if (res) {
160        ALOGE("%s: Failed to add new entry (%d, %p, %d) to metadata %p",
161                __func__, tag, tag_data, count, tmp);
162        return res;
163    }
164
165    replace(tmp);
166    return 0;
167}
168
169camera_metadata_t* Metadata::get()
170{
171    return mData;
172}
173
174} // namespace default_camera_hal
175