Move EVS HAL under automotive folder
Test: Build locally
Change-Id: I76aa7eb52497169d0edcb6d756e0a7ca31bb0b46
diff --git a/automotive/evs/1.0/default/EvsCamera.cpp b/automotive/evs/1.0/default/EvsCamera.cpp
new file mode 100644
index 0000000..6bcf22a
--- /dev/null
+++ b/automotive/evs/1.0/default/EvsCamera.cpp
@@ -0,0 +1,493 @@
+/*
+ * Copyright (C) 2016 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 "android.hardware.automotive.evs@1.0-service"
+
+#include "EvsCamera.h"
+
+#include <ui/GraphicBufferAllocator.h>
+#include <ui/GraphicBufferMapper.h>
+
+
+namespace android {
+namespace hardware {
+namespace automotive {
+namespace evs {
+namespace V1_0 {
+namespace implementation {
+
+
+// These are the special camera names for which we'll initialize custom test data
+const char EvsCamera::kCameraName_Backup[] = "backup";
+const char EvsCamera::kCameraName_RightTurn[] = "Right Turn";
+
+// Arbitrary limit on number of graphics buffers allowed to be allocated
+// Safeguards against unreasonable resource consumption and provides a testable limit
+const unsigned MAX_BUFFERS_IN_FLIGHT = 100;
+
+
+// TODO(b/31632518): Need to get notification when our client dies so we can close the camera.
+// As it stands, if the client dies suddenly, the buffer may be stranded.
+
+EvsCamera::EvsCamera(const char *id) :
+ mFramesAllowed(0),
+ mFramesInUse(0),
+ mStreamState(STOPPED) {
+
+ ALOGD("EvsCamera instantiated");
+
+ mDescription.cameraId = id;
+
+ // Set up dummy data for testing
+ if (mDescription.cameraId == kCameraName_Backup) {
+ mDescription.hints = static_cast<uint32_t>(UsageHint::USAGE_HINT_REVERSE);
+ mDescription.vendorFlags = 0xFFFFFFFF; // Arbitrary value
+ mDescription.defaultHorResolution = 320; // 1/2 NTSC/VGA
+ mDescription.defaultVerResolution = 240; // 1/2 NTSC/VGA
+ } else if (mDescription.cameraId == kCameraName_RightTurn) {
+ // Nothing but the name and the usage hint
+ mDescription.hints = static_cast<uint32_t>(UsageHint::USAGE_HINT_RIGHT_TURN);
+ } else {
+ // Leave empty for a minimalist camera description without even a hint
+ }
+
+
+ // Set our buffer properties
+ mWidth = (mDescription.defaultHorResolution) ? mDescription.defaultHorResolution : 640;
+ mHeight = (mDescription.defaultVerResolution) ? mDescription.defaultVerResolution : 480;
+
+ mFormat = HAL_PIXEL_FORMAT_RGBA_8888;
+ mUsage = GRALLOC_USAGE_HW_TEXTURE | GRALLOC_USAGE_HW_CAMERA_WRITE |
+ GRALLOC_USAGE_SW_READ_RARELY | GRALLOC_USAGE_SW_WRITE_RARELY;
+}
+
+
+EvsCamera::~EvsCamera() {
+ ALOGD("EvsCamera being destroyed");
+ std::lock_guard<std::mutex> lock(mAccessLock);
+
+ // Make sure our output stream is cleaned up
+ // (It really should be already)
+ stopVideoStream();
+
+ // Drop all the graphics buffers we've been using
+ GraphicBufferAllocator& alloc(GraphicBufferAllocator::get());
+ for (auto&& rec : mBuffers) {
+ if (rec.inUse) {
+ ALOGE("Error - releasing buffer despite remote ownership");
+ }
+ alloc.free(rec.handle);
+ rec.handle = nullptr;
+ }
+
+ ALOGD("EvsCamera destroyed");
+}
+
+
+// Methods from ::android::hardware::automotive::evs::V1_0::IEvsCamera follow.
+Return<void> EvsCamera::getId(getId_cb id_cb) {
+ ALOGD("getId");
+
+ id_cb(mDescription.cameraId);
+
+ return Void();
+}
+
+
+Return<EvsResult> EvsCamera::setMaxFramesInFlight(uint32_t bufferCount) {
+ ALOGD("setMaxFramesInFlight");
+ std::lock_guard<std::mutex> lock(mAccessLock);
+
+ // We cannot function without at least one video buffer to send data
+ if (bufferCount < 1) {
+ ALOGE("Ignoring setMaxFramesInFlight with less than one buffer requested");
+ return EvsResult::INVALID_ARG;
+ }
+
+ // Update our internal state
+ if (setAvailableFrames_Locked(bufferCount)) {
+ return EvsResult::OK;
+ } else {
+ return EvsResult::BUFFER_NOT_AVAILABLE;
+ }
+}
+
+
+Return<EvsResult> EvsCamera::startVideoStream(const ::android::sp<IEvsCameraStream>& stream) {
+ ALOGD("startVideoStream");
+ std::lock_guard<std::mutex> lock(mAccessLock);
+
+ if (mStreamState != STOPPED) {
+ ALOGE("ignoring startVideoStream call when a stream is already running.");
+ return EvsResult::STREAM_ALREADY_RUNNING;
+ }
+
+ // If the client never indicated otherwise, configure ourselves for a single streaming buffer
+ if (mFramesAllowed < 1) {
+ if (!setAvailableFrames_Locked(1)) {
+ ALOGE("Failed to start stream because we couldn't get a graphics buffer");
+ return EvsResult::BUFFER_NOT_AVAILABLE;
+ }
+ }
+
+ // Record the user's callback for use when we have a frame ready
+ mStream = stream;
+
+ // Start the frame generation thread
+ mStreamState = RUNNING;
+ mCaptureThread = std::thread([this](){ generateFrames(); });
+
+ return EvsResult::OK;
+}
+
+
+Return<void> EvsCamera::doneWithFrame(const BufferDesc& buffer) {
+ ALOGD("doneWithFrame");
+ { // lock context
+ std::lock_guard <std::mutex> lock(mAccessLock);
+
+ if (buffer.memHandle == nullptr) {
+ ALOGE("ignoring doneWithFrame called with null handle");
+ } else if (buffer.bufferId >= mBuffers.size()) {
+ ALOGE("ignoring doneWithFrame called with invalid bufferId %d (max is %lu)",
+ buffer.bufferId, mBuffers.size()-1);
+ } else if (!mBuffers[buffer.bufferId].inUse) {
+ ALOGE("ignoring doneWithFrame called on frame %d which is already free",
+ buffer.bufferId);
+ } else {
+ // Mark the frame as available
+ mBuffers[buffer.bufferId].inUse = false;
+ mFramesInUse--;
+
+ // If this frame's index is high in the array, try to move it down
+ // to improve locality after mFramesAllowed has been reduced.
+ if (buffer.bufferId >= mFramesAllowed) {
+ // Find an empty slot lower in the array (which should always exist in this case)
+ for (auto&& rec : mBuffers) {
+ if (rec.handle == nullptr) {
+ rec.handle = mBuffers[buffer.bufferId].handle;
+ mBuffers[buffer.bufferId].handle = nullptr;
+ break;
+ }
+ }
+ }
+ }
+ }
+
+ return Void();
+}
+
+
+Return<void> EvsCamera::stopVideoStream() {
+ ALOGD("stopVideoStream");
+ std::unique_lock <std::mutex> lock(mAccessLock);
+
+ if (mStreamState == RUNNING) {
+ // Tell the GenerateFrames loop we want it to stop
+ mStreamState = STOPPING;
+
+ // Block outside the mutex until the "stop" flag has been acknowledged
+ // We won't send any more frames, but the client might still get some already in flight
+ ALOGD("Waiting for stream thread to end...");
+ lock.unlock();
+ mCaptureThread.join();
+ lock.lock();
+
+ mStreamState = STOPPED;
+ ALOGD("Stream marked STOPPED.");
+ }
+
+ return Void();
+}
+
+
+Return<int32_t> EvsCamera::getExtendedInfo(uint32_t opaqueIdentifier) {
+ ALOGD("getExtendedInfo");
+ std::lock_guard<std::mutex> lock(mAccessLock);
+
+ // For any single digit value, return the index itself as a test value
+ if (opaqueIdentifier <= 9) {
+ return opaqueIdentifier;
+ }
+
+ // Return zero by default as required by the spec
+ return 0;
+}
+
+
+Return<EvsResult> EvsCamera::setExtendedInfo(uint32_t /*opaqueIdentifier*/, int32_t /*opaqueValue*/) {
+ ALOGD("setExtendedInfo");
+ std::lock_guard<std::mutex> lock(mAccessLock);
+
+ // We don't store any device specific information in this implementation
+ return EvsResult::INVALID_ARG;
+}
+
+
+bool EvsCamera::setAvailableFrames_Locked(unsigned bufferCount) {
+ if (bufferCount < 1) {
+ ALOGE("Ignoring request to set buffer count to zero");
+ return false;
+ }
+ if (bufferCount > MAX_BUFFERS_IN_FLIGHT) {
+ ALOGE("Rejecting buffer request in excess of internal limit");
+ return false;
+ }
+
+ // Is an increase required?
+ if (mFramesAllowed < bufferCount) {
+ // An increase is required
+ unsigned needed = bufferCount - mFramesAllowed;
+ ALOGI("Allocating %d buffers for camera frames", needed);
+
+ unsigned added = increaseAvailableFrames_Locked(needed);
+ if (added != needed) {
+ // If we didn't add all the frames we needed, then roll back to the previous state
+ ALOGE("Rolling back to previous frame queue size");
+ decreaseAvailableFrames_Locked(added);
+ return false;
+ }
+ } else if (mFramesAllowed > bufferCount) {
+ // A decrease is required
+ unsigned framesToRelease = mFramesAllowed - bufferCount;
+ ALOGI("Returning %d camera frame buffers", framesToRelease);
+
+ unsigned released = decreaseAvailableFrames_Locked(framesToRelease);
+ if (released != framesToRelease) {
+ // This shouldn't happen with a properly behaving client because the client
+ // should only make this call after returning sufficient outstanding buffers
+ // to allow a clean resize.
+ ALOGE("Buffer queue shrink failed -- too many buffers currently in use?");
+ }
+ }
+
+ return true;
+}
+
+
+unsigned EvsCamera::increaseAvailableFrames_Locked(unsigned numToAdd) {
+ // Acquire the graphics buffer allocator
+ GraphicBufferAllocator &alloc(GraphicBufferAllocator::get());
+
+ unsigned added = 0;
+
+ while (added < numToAdd) {
+ buffer_handle_t memHandle = nullptr;
+ status_t result = alloc.allocate(mWidth, mHeight,
+ mFormat, 1,
+ mUsage, mUsage,
+ &memHandle, &mStride, 0, "EvsCamera");
+ if (result != NO_ERROR) {
+ ALOGE("Error %d allocating %d x %d graphics buffer", result, mWidth, mHeight);
+ break;
+ }
+ if (!memHandle) {
+ ALOGE("We didn't get a buffer handle back from the allocator");
+ break;
+ }
+
+ // Find a place to store the new buffer
+ bool stored = false;
+ for (auto&& rec : mBuffers) {
+ if (rec.handle == nullptr) {
+ // Use this existing entry
+ rec.handle = memHandle;
+ rec.inUse = false;
+ stored = true;
+ break;
+ }
+ }
+ if (!stored) {
+ // Add a BufferRecord wrapping this handle to our set of available buffers
+ mBuffers.emplace_back(memHandle);
+ }
+
+ mFramesAllowed++;
+ added++;
+ }
+
+ return added;
+}
+
+
+unsigned EvsCamera::decreaseAvailableFrames_Locked(unsigned numToRemove) {
+ // Acquire the graphics buffer allocator
+ GraphicBufferAllocator &alloc(GraphicBufferAllocator::get());
+
+ unsigned removed = 0;
+
+ for (auto&& rec : mBuffers) {
+ // Is this record not in use, but holding a buffer that we can free?
+ if ((rec.inUse == false) && (rec.handle != nullptr)) {
+ // Release buffer and update the record so we can recognize it as "empty"
+ alloc.free(rec.handle);
+ rec.handle = nullptr;
+
+ mFramesAllowed--;
+ removed++;
+
+ if (removed == numToRemove) {
+ break;
+ }
+ }
+ }
+
+ return removed;
+}
+
+
+// This is the asynchronous frame generation thread that runs in parallel with the
+// main serving thread. There is one for each active camera instance.
+void EvsCamera::generateFrames() {
+ ALOGD("Frame generation loop started");
+
+ unsigned idx;
+
+ while (true) {
+ bool timeForFrame = false;
+ // Lock scope
+ {
+ std::lock_guard<std::mutex> lock(mAccessLock);
+
+ if (mStreamState != RUNNING) {
+ // Break out of our main thread loop
+ break;
+ }
+
+ // Are we allowed to issue another buffer?
+ if (mFramesInUse >= mFramesAllowed) {
+ // Can't do anything right now -- skip this frame
+ ALOGW("Skipped a frame because too many are in flight\n");
+ } else {
+ // Identify an available buffer to fill
+ for (idx = 0; idx < mBuffers.size(); idx++) {
+ if (!mBuffers[idx].inUse) {
+ if (mBuffers[idx].handle != nullptr) {
+ // Found an available record, so stop looking
+ break;
+ }
+ }
+ }
+ if (idx >= mBuffers.size()) {
+ // This shouldn't happen since we already checked mFramesInUse vs mFramesAllowed
+ ALOGE("Failed to find an available buffer slot\n");
+ } else {
+ // We're going to make the frame busy
+ mBuffers[idx].inUse = true;
+ mFramesInUse++;
+ timeForFrame = true;
+ }
+ }
+ }
+
+ if (timeForFrame) {
+ // Assemble the buffer description we'll transmit below
+ BufferDesc buff = {};
+ buff.width = mWidth;
+ buff.height = mHeight;
+ buff.stride = mStride;
+ buff.format = mFormat;
+ buff.usage = mUsage;
+ buff.bufferId = idx;
+ buff.memHandle = mBuffers[idx].handle;
+
+ // Write test data into the image buffer
+ fillTestFrame(buff);
+
+ // Issue the (asynchronous) callback to the client -- can't be holding the lock
+ auto result = mStream->deliverFrame(buff);
+ if (result.isOk()) {
+ ALOGD("Delivered %p as id %d", buff.memHandle.getNativeHandle(), buff.bufferId);
+ } else {
+ // This can happen if the client dies and is likely unrecoverable.
+ // To avoid consuming resources generating failing calls, we stop sending
+ // frames. Note, however, that the stream remains in the "STREAMING" state
+ // until cleaned up on the main thread.
+ ALOGE("Frame delivery call failed in the transport layer.");
+
+ // Since we didn't actually deliver it, mark the frame as available
+ std::lock_guard<std::mutex> lock(mAccessLock);
+ mBuffers[idx].inUse = false;
+ mFramesInUse--;
+
+ break;
+ }
+ }
+
+ // We arbitrarily choose to generate frames at 10 fps (1/10 * uSecPerSec)
+ usleep(100000);
+ }
+
+ // If we've been asked to stop, send one last NULL frame to signal the actual end of stream
+ BufferDesc nullBuff = {};
+ auto result = mStream->deliverFrame(nullBuff);
+ if (!result.isOk()) {
+ ALOGE("Error delivering end of stream marker");
+ }
+
+ return;
+}
+
+
+void EvsCamera::fillTestFrame(const BufferDesc& buff) {
+ // Lock our output buffer for writing
+ uint32_t *pixels = nullptr;
+ GraphicBufferMapper &mapper = GraphicBufferMapper::get();
+ mapper.lock(buff.memHandle,
+ GRALLOC_USAGE_SW_WRITE_OFTEN | GRALLOC_USAGE_SW_READ_NEVER,
+ android::Rect(buff.width, buff.height),
+ (void **) &pixels);
+
+ // If we failed to lock the pixel buffer, we're about to crash, but log it first
+ if (!pixels) {
+ ALOGE("Camera failed to gain access to image buffer for writing");
+ }
+
+ // Fill in the test pixels
+ for (unsigned row = 0; row < buff.height; row++) {
+ for (unsigned col = 0; col < buff.width; col++) {
+ // Index into the row to check the pixel at this column.
+ // We expect 0xFF in the LSB channel, a vertical gradient in the
+ // second channel, a horitzontal gradient in the third channel, and
+ // 0xFF in the MSB.
+ // The exception is the very first 32 bits which is used for the
+ // time varying frame signature to avoid getting fooled by a static image.
+ uint32_t expectedPixel = 0xFF0000FF | // MSB and LSB
+ ((row & 0xFF) << 8) | // vertical gradient
+ ((col & 0xFF) << 16); // horizontal gradient
+ if ((row | col) == 0) {
+ static uint32_t sFrameTicker = 0;
+ expectedPixel = (sFrameTicker) & 0xFF;
+ sFrameTicker++;
+ }
+ pixels[col] = expectedPixel;
+ }
+ // Point to the next row
+ // NOTE: stride retrieved from gralloc is in units of pixels
+ pixels = pixels + buff.stride;
+ }
+
+ // Release our output buffer
+ mapper.unlock(buff.memHandle);
+}
+
+
+} // namespace implementation
+} // namespace V1_0
+} // namespace evs
+} // namespace automotive
+} // namespace hardware
+} // namespace android