/*
 * 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.
 */

//#define LOG_NDEBUG 0
#define LOG_TAG "Utils"
#include <utils/Log.h>

#include "include/ESDS.h"

#include <arpa/inet.h>

#include <media/stagefright/foundation/ABuffer.h>
#include <media/stagefright/foundation/ADebug.h>
#include <media/stagefright/foundation/AMessage.h>
#include <media/stagefright/MetaData.h>
#include <media/stagefright/Utils.h>

namespace android {

uint16_t U16_AT(const uint8_t *ptr) {
    return ptr[0] << 8 | ptr[1];
}

uint32_t U32_AT(const uint8_t *ptr) {
    return ptr[0] << 24 | ptr[1] << 16 | ptr[2] << 8 | ptr[3];
}

uint64_t U64_AT(const uint8_t *ptr) {
    return ((uint64_t)U32_AT(ptr)) << 32 | U32_AT(ptr + 4);
}

uint16_t U16LE_AT(const uint8_t *ptr) {
    return ptr[0] | (ptr[1] << 8);
}

uint32_t U32LE_AT(const uint8_t *ptr) {
    return ptr[3] << 24 | ptr[2] << 16 | ptr[1] << 8 | ptr[0];
}

uint64_t U64LE_AT(const uint8_t *ptr) {
    return ((uint64_t)U32LE_AT(ptr + 4)) << 32 | U32LE_AT(ptr);
}

// XXX warning: these won't work on big-endian host.
uint64_t ntoh64(uint64_t x) {
    return ((uint64_t)ntohl(x & 0xffffffff) << 32) | ntohl(x >> 32);
}

uint64_t hton64(uint64_t x) {
    return ((uint64_t)htonl(x & 0xffffffff) << 32) | htonl(x >> 32);
}

status_t convertMetaDataToMessage(
        const sp<MetaData> &meta, sp<AMessage> *format) {
    format->clear();

    const char *mime;
    CHECK(meta->findCString(kKeyMIMEType, &mime));

    sp<AMessage> msg = new AMessage;
    msg->setString("mime", mime);

    int64_t durationUs;
    if (meta->findInt64(kKeyDuration, &durationUs)) {
        msg->setInt64("durationUs", durationUs);
    }

    if (!strncasecmp("video/", mime, 6)) {
        int32_t width, height;
        CHECK(meta->findInt32(kKeyWidth, &width));
        CHECK(meta->findInt32(kKeyHeight, &height));

        msg->setInt32("width", width);
        msg->setInt32("height", height);
    } else if (!strncasecmp("audio/", mime, 6)) {
        int32_t numChannels, sampleRate;
        CHECK(meta->findInt32(kKeyChannelCount, &numChannels));
        CHECK(meta->findInt32(kKeySampleRate, &sampleRate));

        msg->setInt32("channel-count", numChannels);
        msg->setInt32("sample-rate", sampleRate);

        int32_t channelMask;
        if (meta->findInt32(kKeyChannelMask, &channelMask)) {
            msg->setInt32("channel-mask", channelMask);
        }

        int32_t delay = 0;
        if (meta->findInt32(kKeyEncoderDelay, &delay)) {
            msg->setInt32("encoder-delay", delay);
        }
        int32_t padding = 0;
        if (meta->findInt32(kKeyEncoderPadding, &padding)) {
            msg->setInt32("encoder-padding", padding);
        }

        int32_t isADTS;
        if (meta->findInt32(kKeyIsADTS, &isADTS)) {
            msg->setInt32("is-adts", true);
        }
    }

    int32_t maxInputSize;
    if (meta->findInt32(kKeyMaxInputSize, &maxInputSize)) {
        msg->setInt32("max-input-size", maxInputSize);
    }

    uint32_t type;
    const void *data;
    size_t size;
    if (meta->findData(kKeyAVCC, &type, &data, &size)) {
        // Parse the AVCDecoderConfigurationRecord

        const uint8_t *ptr = (const uint8_t *)data;

        CHECK(size >= 7);
        CHECK_EQ((unsigned)ptr[0], 1u);  // configurationVersion == 1
        uint8_t profile = ptr[1];
        uint8_t level = ptr[3];

        // There is decodable content out there that fails the following
        // assertion, let's be lenient for now...
        // CHECK((ptr[4] >> 2) == 0x3f);  // reserved

        size_t lengthSize = 1 + (ptr[4] & 3);

        // commented out check below as H264_QVGA_500_NO_AUDIO.3gp
        // violates it...
        // CHECK((ptr[5] >> 5) == 7);  // reserved

        size_t numSeqParameterSets = ptr[5] & 31;

        ptr += 6;
        size -= 6;

        sp<ABuffer> buffer = new ABuffer(1024);
        buffer->setRange(0, 0);

        for (size_t i = 0; i < numSeqParameterSets; ++i) {
            CHECK(size >= 2);
            size_t length = U16_AT(ptr);

            ptr += 2;
            size -= 2;

            CHECK(size >= length);

            memcpy(buffer->data() + buffer->size(), "\x00\x00\x00\x01", 4);
            memcpy(buffer->data() + buffer->size() + 4, ptr, length);
            buffer->setRange(0, buffer->size() + 4 + length);

            ptr += length;
            size -= length;
        }

        buffer->meta()->setInt32("csd", true);
        buffer->meta()->setInt64("timeUs", 0);

        msg->setBuffer("csd-0", buffer);

        buffer = new ABuffer(1024);
        buffer->setRange(0, 0);

        CHECK(size >= 1);
        size_t numPictureParameterSets = *ptr;
        ++ptr;
        --size;

        for (size_t i = 0; i < numPictureParameterSets; ++i) {
            CHECK(size >= 2);
            size_t length = U16_AT(ptr);

            ptr += 2;
            size -= 2;

            CHECK(size >= length);

            memcpy(buffer->data() + buffer->size(), "\x00\x00\x00\x01", 4);
            memcpy(buffer->data() + buffer->size() + 4, ptr, length);
            buffer->setRange(0, buffer->size() + 4 + length);

            ptr += length;
            size -= length;
        }

        buffer->meta()->setInt32("csd", true);
        buffer->meta()->setInt64("timeUs", 0);
        msg->setBuffer("csd-1", buffer);
    } else if (meta->findData(kKeyESDS, &type, &data, &size)) {
        ESDS esds((const char *)data, size);
        CHECK_EQ(esds.InitCheck(), (status_t)OK);

        const void *codec_specific_data;
        size_t codec_specific_data_size;
        esds.getCodecSpecificInfo(
                &codec_specific_data, &codec_specific_data_size);

        sp<ABuffer> buffer = new ABuffer(codec_specific_data_size);

        memcpy(buffer->data(), codec_specific_data,
               codec_specific_data_size);

        buffer->meta()->setInt32("csd", true);
        buffer->meta()->setInt64("timeUs", 0);
        msg->setBuffer("csd-0", buffer);
    } else if (meta->findData(kKeyVorbisInfo, &type, &data, &size)) {
        sp<ABuffer> buffer = new ABuffer(size);
        memcpy(buffer->data(), data, size);

        buffer->meta()->setInt32("csd", true);
        buffer->meta()->setInt64("timeUs", 0);
        msg->setBuffer("csd-0", buffer);

        if (!meta->findData(kKeyVorbisBooks, &type, &data, &size)) {
            return -EINVAL;
        }

        buffer = new ABuffer(size);
        memcpy(buffer->data(), data, size);

        buffer->meta()->setInt32("csd", true);
        buffer->meta()->setInt64("timeUs", 0);
        msg->setBuffer("csd-1", buffer);
    }

    *format = msg;

    return OK;
}

}  // namespace android