blob: 262bbde85e0a43fe5c9108171b0cd89198be7bb2 [file] [log] [blame]
// Copyright 2018 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "device_ctx.h"
#include <fuchsia/hardware/mediacodec/c/fidl.h>
#include <lib/sync/completion.h>
#include "amlogic-video.h"
#include "macros.h"
namespace {
const fuchsia_hardware_mediacodec_Device_ops_t kFidlOps = {
.GetCodecFactory =
[](void* ctx, zx_handle_t handle) {
zx::channel request(handle);
return ZX_OK;
static zx_status_t amlogic_video_message(void* ctx, fidl_msg_t* msg, fidl_txn_t* txn) {
return fuchsia_hardware_mediacodec_Device_dispatch(ctx, txn, msg, &kFidlOps);
static void amlogic_release(void* ctx) { delete static_cast<DeviceCtx*>(ctx); }
static zx_protocol_device_t amlogic_video_device_ops = {
DEVICE_OPS_VERSION, .release = amlogic_release, .message = amlogic_video_message,
// TODO(jbauman) or TODO(dustingreen): .suspend .resume
} // namespace
DeviceCtx::DeviceCtx(DriverCtx* driver)
: driver_(driver), codec_admission_control_(driver->shared_fidl_loop()->dispatcher()) {
video_ = std::make_unique<AmlogicVideo>();
device_fidl_ = std::make_unique<DeviceFidl>(this);
DeviceCtx::~DeviceCtx() {
// There are two ways to destroy a fidl::Binding safely:
// * Switch to FIDL thread before Unbind() or ~Binding.
// * async::Loop Quit() + JoinThreads() before Unbind() or ~Binding
// For now this code (if implementation needed) will choose the first option
// by destructing DeviceFidl on the FIDL thread. The current way forces this
// thread to wait in this destructor until the shared_fidl_thread() is done
// processing ~DeviceFidl, which means we require that ~DeviceCtx is not
// itself running on the shared_fidl_thread() (or we could check which thread
// here, if we really need to).
// This code is only run when we switch between test and production drivers.
sync_completion_t completion;
driver_->PostToSharedFidl([this, &completion]() {
sync_completion_wait(&completion, ZX_TIME_INFINITE);
zx_status_t DeviceCtx::Bind(zx_device_t* parent) {
device_add_args_t vc_video_args = {};
vc_video_args.version = DEVICE_ADD_ARGS_VERSION; = "amlogic_video";
vc_video_args.ctx = this;
vc_video_args.ops = &amlogic_video_device_ops;
// ZX_PROTOCOL_MEDIA_CODEC causes /dev/class/media-codec to get created, and
// proto_ops_ is empty but has a non-null address, so we don't break the
// invariant that devices with a protocol have non-null proto_ops.
vc_video_args.proto_id = ZX_PROTOCOL_MEDIA_CODEC;
vc_video_args.proto_ops = &proto_ops_;
zx_status_t status = device_add(parent, &vc_video_args, &device_);
if (status != ZX_OK) {
DECODE_ERROR("Failed to bind device");
return ZX_OK;
void DeviceCtx::GetCodecFactory(zx::channel request) {