modules/camera/Stream.cpp

/*
 * 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.
 */

#include <pthread.h>
#include <hardware/camera3.h>
#include <hardware/gralloc.h>
#include <system/graphics.h>

//#define LOG_NDEBUG 0
#define LOG_TAG "Stream"
#include <cutils/log.h>

#define ATRACE_TAG (ATRACE_TAG_CAMERA | ATRACE_TAG_HAL)
#include <utils/Trace.h>

#include "Stream.h"

namespace default_camera_hal {

Stream::Stream(int id, camera3_stream_t *s)
  : mReuse(false),
    mId(id),
    mStream(s),
    mType(s->stream_type),
    mWidth(s->width),
    mHeight(s->height),
    mFormat(s->format),
    mUsage(0),
    mMaxBuffers(0),
    mRegistered(false),
    mBuffers(0),
    mNumBuffers(0)
{
    // NULL (default) pthread mutex attributes
    pthread_mutex_init(&mMutex, NULL);
}

Stream::~Stream()
{
    pthread_mutex_lock(&mMutex);
    unregisterBuffers_L();
    pthread_mutex_unlock(&mMutex);
}

void Stream::setUsage(uint32_t usage)
{
    pthread_mutex_lock(&mMutex);
    if (usage != mUsage) {
        mUsage = usage;
        mStream->usage = usage;
        unregisterBuffers_L();
    }
    pthread_mutex_unlock(&mMutex);
}

void Stream::setMaxBuffers(uint32_t max_buffers)
{
    pthread_mutex_lock(&mMutex);
    if (max_buffers != mMaxBuffers) {
        mMaxBuffers = max_buffers;
        mStream->max_buffers = max_buffers;
        unregisterBuffers_L();
    }
    pthread_mutex_unlock(&mMutex);
}

int Stream::getType()
{
    return mType;
}

bool Stream::isInputType()
{
    return mType == CAMERA3_STREAM_INPUT ||
        mType == CAMERA3_STREAM_BIDIRECTIONAL;
}

bool Stream::isOutputType()
{
    return mType == CAMERA3_STREAM_OUTPUT ||
        mType == CAMERA3_STREAM_BIDIRECTIONAL;
}

bool Stream::isRegistered()
{
    return mRegistered;
}

bool Stream::isValidReuseStream(int id, camera3_stream_t *s)
{
    if (id != mId) {
        ALOGE("%s:%d: Invalid camera id for reuse. Got %d expect %d",
                __func__, mId, id, mId);
        return false;
    }
    if (s != mStream) {
        ALOGE("%s:%d: Invalid stream handle for reuse. Got %p expect %p",
                __func__, mId, s, mStream);
        return false;
    }
    if (s->stream_type != mType) {
        // TODO: prettyprint type string
        ALOGE("%s:%d: Mismatched type in reused stream. Got %d expect %d",
                __func__, mId, s->stream_type, mType);
        return false;
    }
    if (s->format != mFormat) {
        // TODO: prettyprint format string
        ALOGE("%s:%d: Mismatched format in reused stream. Got %d expect %d",
                __func__, mId, s->format, mFormat);
        return false;
    }
    if (s->width != mWidth) {
        ALOGE("%s:%d: Mismatched width in reused stream. Got %d expect %d",
                __func__, mId, s->width, mWidth);
        return false;
    }
    if (s->height != mHeight) {
        ALOGE("%s:%d: Mismatched height in reused stream. Got %d expect %d",
                __func__, mId, s->height, mHeight);
        return false;
    }
    return true;
}

int Stream::registerBuffers(const camera3_stream_buffer_set_t *buf_set)
{
    ATRACE_CALL();

    if (buf_set->stream != mStream) {
        ALOGE("%s:%d: Buffer set for invalid stream. Got %p expect %p",
                __func__, mId, buf_set->stream, mStream);
        return -EINVAL;
    }

    pthread_mutex_lock(&mMutex);

    mNumBuffers = buf_set->num_buffers;
    mBuffers = new buffer_handle_t*[mNumBuffers];

    for (unsigned int i = 0; i < mNumBuffers; i++) {
        ALOGV("%s:%d: Registering buffer %p", __func__, mId,
                buf_set->buffers[i]);
        mBuffers[i] = buf_set->buffers[i];
        // TODO: register buffers with hw, handle error cases
    }
    mRegistered = true;

    pthread_mutex_unlock(&mMutex);

    return 0;
}

// This must only be called with mMutex held
void Stream::unregisterBuffers_L()
{
    mRegistered = false;
    mNumBuffers = 0;
    delete [] mBuffers;
    // TODO: unregister buffers from hw
}

} // namespace default_camera_hal