media/libstagefright/MetaData.cpp

/*
 * Copyright (C) 2009 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 <stdlib.h>
#include <string.h>

#include <media/stagefright/MediaDebug.h>
#include <media/stagefright/MetaData.h>

namespace android {

MetaData::MetaData() {
}

MetaData::MetaData(const MetaData &from)
    : RefBase(),
      mItems(from.mItems) {
}

MetaData::~MetaData() {
    clear();
}

void MetaData::clear() {
    mItems.clear();
}

bool MetaData::remove(uint32_t key) {
    ssize_t i = mItems.indexOfKey(key);

    if (i < 0) {
        return false;
    }

    mItems.removeItemsAt(i);

    return true;
}

bool MetaData::setCString(uint32_t key, const char *value) {
    return setData(key, TYPE_C_STRING, value, strlen(value) + 1);
}

bool MetaData::setInt32(uint32_t key, int32_t value) {
    return setData(key, TYPE_INT32, &value, sizeof(value));
}

bool MetaData::setInt64(uint32_t key, int64_t value) {
    return setData(key, TYPE_INT64, &value, sizeof(value));
}

bool MetaData::setFloat(uint32_t key, float value) {
    return setData(key, TYPE_FLOAT, &value, sizeof(value));
}

bool MetaData::setPointer(uint32_t key, void *value) {
    return setData(key, TYPE_POINTER, &value, sizeof(value));
}

bool MetaData::findCString(uint32_t key, const char **value) {
    uint32_t type;
    const void *data;
    size_t size;
    if (!findData(key, &type, &data, &size) || type != TYPE_C_STRING) {
        return false;
    }

    *value = (const char *)data;

    return true;
}

bool MetaData::findInt32(uint32_t key, int32_t *value) {
    uint32_t type;
    const void *data;
    size_t size;
    if (!findData(key, &type, &data, &size) || type != TYPE_INT32) {
        return false;
    }

    CHECK_EQ(size, sizeof(*value));

    *value = *(int32_t *)data;

    return true;
}

bool MetaData::findInt64(uint32_t key, int64_t *value) {
    uint32_t type;
    const void *data;
    size_t size;
    if (!findData(key, &type, &data, &size) || type != TYPE_INT64) {
        return false;
    }

    CHECK_EQ(size, sizeof(*value));

    *value = *(int64_t *)data;

    return true;
}

bool MetaData::findFloat(uint32_t key, float *value) {
    uint32_t type;
    const void *data;
    size_t size;
    if (!findData(key, &type, &data, &size) || type != TYPE_FLOAT) {
        return false;
    }

    CHECK_EQ(size, sizeof(*value));

    *value = *(float *)data;

    return true;
}

bool MetaData::findPointer(uint32_t key, void **value) {
    uint32_t type;
    const void *data;
    size_t size;
    if (!findData(key, &type, &data, &size) || type != TYPE_POINTER) {
        return false;
    }

    CHECK_EQ(size, sizeof(*value));

    *value = *(void **)data;

    return true;
}

bool MetaData::setData(
        uint32_t key, uint32_t type, const void *data, size_t size) {
    bool overwrote_existing = true;

    ssize_t i = mItems.indexOfKey(key);
    if (i < 0) {
        typed_data item;
        i = mItems.add(key, item);

        overwrote_existing = false;
    }

    typed_data &item = mItems.editValueAt(i);

    item.setData(type, data, size);

    return overwrote_existing;
}

bool MetaData::findData(uint32_t key, uint32_t *type,
                        const void **data, size_t *size) const {
    ssize_t i = mItems.indexOfKey(key);

    if (i < 0) {
        return false;
    }

    const typed_data &item = mItems.valueAt(i);

    item.getData(type, data, size);

    return true;
}

MetaData::typed_data::typed_data()
    : mType(0),
      mSize(0) {
}

MetaData::typed_data::~typed_data() {
    clear();
}

MetaData::typed_data::typed_data(const typed_data &from)
    : mType(from.mType),
      mSize(0) {
    allocateStorage(from.mSize);
    memcpy(storage(), from.storage(), mSize);
}

MetaData::typed_data &MetaData::typed_data::operator=(
        const MetaData::typed_data &from) {
    if (this != &from) {
        clear();
        mType = from.mType;
        allocateStorage(from.mSize);
        memcpy(storage(), from.storage(), mSize);
    }

    return *this;
}

void MetaData::typed_data::clear() {
    freeStorage();

    mType = 0;
}

void MetaData::typed_data::setData(
        uint32_t type, const void *data, size_t size) {
    clear();

    mType = type;
    allocateStorage(size);
    memcpy(storage(), data, size);
}

void MetaData::typed_data::getData(
        uint32_t *type, const void **data, size_t *size) const {
    *type = mType;
    *size = mSize;
    *data = storage();
}

void MetaData::typed_data::allocateStorage(size_t size) {
    mSize = size;

    if (usesReservoir()) {
        return;
    }

    u.ext_data = malloc(mSize);
}

void MetaData::typed_data::freeStorage() {
    if (!usesReservoir()) {
        if (u.ext_data) {
            free(u.ext_data);
        }
    }

    mSize = 0;
}

}  // namespace android