/*
 * Copyright (C) 2013 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_TAG "Camera3-Stream"
#define ATRACE_TAG ATRACE_TAG_CAMERA
//#define LOG_NDEBUG 0

#include <utils/Log.h>
#include <utils/Trace.h>
#include "Camera3Stream.h"

namespace android {

namespace camera3 {

Camera3Stream::~Camera3Stream() {
}

Camera3Stream* Camera3Stream::cast(camera3_stream *stream) {
    return static_cast<Camera3Stream*>(stream);
}

const Camera3Stream* Camera3Stream::cast(const camera3_stream *stream) {
    return static_cast<const Camera3Stream*>(stream);
}

Camera3Stream::Camera3Stream(int id,
        camera3_stream_type type,
        uint32_t width, uint32_t height, size_t maxSize, int format) :
    camera3_stream(),
    mId(id),
    mName(String8::format("Camera3Stream[%d]", id)),
    mMaxSize(maxSize),
    mState(STATE_CONSTRUCTED) {

    camera3_stream::stream_type = type;
    camera3_stream::width = width;
    camera3_stream::height = height;
    camera3_stream::format = format;
    camera3_stream::usage = 0;
    camera3_stream::max_buffers = 0;
    camera3_stream::priv = NULL;

    if (format == HAL_PIXEL_FORMAT_BLOB && maxSize == 0) {
        ALOGE("%s: BLOB format with size == 0", __FUNCTION__);
        mState = STATE_ERROR;
    }
}

int Camera3Stream::getId() const {
    return mId;
}

uint32_t Camera3Stream::getWidth() const {
    return camera3_stream::width;
}

uint32_t Camera3Stream::getHeight() const {
    return camera3_stream::height;
}

int Camera3Stream::getFormat() const {
    return camera3_stream::format;
}

camera3_stream* Camera3Stream::startConfiguration() {
    Mutex::Autolock l(mLock);

    switch (mState) {
        case STATE_ERROR:
            ALOGE("%s: In error state", __FUNCTION__);
            return NULL;
        case STATE_CONSTRUCTED:
            // OK
            break;
        case STATE_IN_CONFIG:
        case STATE_IN_RECONFIG:
            // Can start config again with no trouble; but don't redo
            // oldUsage/oldMaxBuffers
            return this;
        case STATE_CONFIGURED:
            if (stream_type == CAMERA3_STREAM_INPUT) {
                ALOGE("%s: Cannot configure an input stream twice",
                        __FUNCTION__);
                return NULL;
            } else if (hasOutstandingBuffersLocked()) {
                ALOGE("%s: Cannot configure stream; has outstanding buffers",
                        __FUNCTION__);
                return NULL;
            }
            break;
        default:
            ALOGE("%s: Unknown state %d", __FUNCTION__, mState);
            return NULL;
    }

    oldUsage = usage;
    oldMaxBuffers = max_buffers;

    if (mState == STATE_CONSTRUCTED) {
        mState = STATE_IN_CONFIG;
    } else { // mState == STATE_CONFIGURED
        mState = STATE_IN_RECONFIG;
    }

    return this;
}

bool Camera3Stream::isConfiguring() const {
    Mutex::Autolock l(mLock);
    return (mState == STATE_IN_CONFIG) || (mState == STATE_IN_RECONFIG);
}

status_t Camera3Stream::finishConfiguration(camera3_device *hal3Device) {
    Mutex::Autolock l(mLock);
    switch (mState) {
        case STATE_ERROR:
            ALOGE("%s: In error state", __FUNCTION__);
            return INVALID_OPERATION;
        case STATE_IN_CONFIG:
        case STATE_IN_RECONFIG:
            // OK
            break;
        case STATE_CONSTRUCTED:
        case STATE_CONFIGURED:
            ALOGE("%s: Cannot finish configuration that hasn't been started",
                    __FUNCTION__);
            return INVALID_OPERATION;
        default:
            ALOGE("%s: Unknown state", __FUNCTION__);
            return INVALID_OPERATION;
    }

    // Check if the stream configuration is unchanged, and skip reallocation if
    // so. As documented in hardware/camera3.h:configure_streams().
    if (mState == STATE_IN_RECONFIG &&
            oldUsage == usage &&
            oldMaxBuffers == max_buffers) {
        mState = STATE_CONFIGURED;
        return OK;
    }

    status_t res;
    res = configureQueueLocked();
    if (res != OK) {
        ALOGE("%s: Unable to configure stream %d queue: %s (%d)",
                __FUNCTION__, mId, strerror(-res), res);
        mState = STATE_ERROR;
        return res;
    }

    res = registerBuffersLocked(hal3Device);
    if (res != OK) {
        ALOGE("%s: Unable to register stream buffers with HAL: %s (%d)",
                __FUNCTION__, strerror(-res), res);
        mState = STATE_ERROR;
        return res;
    }

    mState = STATE_CONFIGURED;

    return res;
}

status_t Camera3Stream::getBuffer(camera3_stream_buffer *buffer) {
    ATRACE_CALL();
    Mutex::Autolock l(mLock);
    return getBufferLocked(buffer);
}

status_t Camera3Stream::returnBuffer(const camera3_stream_buffer &buffer,
        nsecs_t timestamp) {
    ATRACE_CALL();
    Mutex::Autolock l(mLock);
    return returnBufferLocked(buffer, timestamp);
}

bool Camera3Stream::hasOutstandingBuffers() const {
    ATRACE_CALL();
    Mutex::Autolock l(mLock);
    return hasOutstandingBuffersLocked();
}

status_t Camera3Stream::disconnect() {
    ATRACE_CALL();
    Mutex::Autolock l(mLock);
    return disconnectLocked();
}

status_t Camera3Stream::registerBuffersLocked(camera3_device *hal3Device) {
    ATRACE_CALL();
    status_t res;

    size_t bufferCount = getBufferCountLocked();

    Vector<buffer_handle_t*> buffers;
    buffers.insertAt(NULL, 0, bufferCount);

    camera3_stream_buffer_set bufferSet = camera3_stream_buffer_set();
    bufferSet.stream = this;
    bufferSet.num_buffers = bufferCount;
    bufferSet.buffers = buffers.editArray();

    Vector<camera3_stream_buffer_t> streamBuffers;
    streamBuffers.insertAt(camera3_stream_buffer_t(), 0, bufferCount);

    // Register all buffers with the HAL. This means getting all the buffers
    // from the stream, providing them to the HAL with the
    // register_stream_buffers() method, and then returning them back to the
    // stream in the error state, since they won't have valid data.
    //
    // Only registered buffers can be sent to the HAL.

    uint32_t bufferIdx = 0;
    for (; bufferIdx < bufferCount; bufferIdx++) {
        res = getBufferLocked( &streamBuffers.editItemAt(bufferIdx) );
        if (res != OK) {
            ALOGE("%s: Unable to get buffer %d for registration with HAL",
                    __FUNCTION__, bufferIdx);
            // Skip registering, go straight to cleanup
            break;
        }

        sp<Fence> fence = new Fence(streamBuffers[bufferIdx].acquire_fence);
        fence->waitForever(kRegisterFenceTimeoutMs,
                "Camera3Stream::registerBuffers");

        buffers.editItemAt(bufferIdx) = streamBuffers[bufferIdx].buffer;
    }
    if (bufferIdx == bufferCount) {
        // Got all buffers, register with HAL
        ALOGV("%s: Registering %d buffers with camera HAL",
                __FUNCTION__, bufferCount);
        res = hal3Device->ops->register_stream_buffers(hal3Device,
                &bufferSet);
    }

    // Return all valid buffers to stream, in ERROR state to indicate
    // they weren't filled.
    for (size_t i = 0; i < bufferIdx; i++) {
        streamBuffers.editItemAt(i).release_fence = -1;
        streamBuffers.editItemAt(i).status = CAMERA3_BUFFER_STATUS_ERROR;
        returnBufferLocked(streamBuffers[i], 0);
    }

    return res;
}

}; // namespace camera3

}; // namespace android
