Revert "media/gpu/v4l2: Check request support in queue."

This reverts commit ac6f2444.

Reason for revert: This CL breaks HW decoder on hana.

Original change's description:
> media/gpu/v4l2: Check request support in queue.
> 
> The queue's support is currently checked in the video decoder but the
> queue should be responsible to check whether it does support requests or not.
> This patch moves the check for the request support to the V4L2Queue
> constructor.
> 
> BUG=chromium:1009921
> TEST=ran tast with video.DecodeAccelVDVP8ResolutionSwitch on veyron_minnie-kernelnext.
> TEST=ran tast with video.DecodeAccelVDH264ResolutionSwitch on veyron_minnie-kernelnext.
> TEST=ran tast with video.DecodeAccelVDVP8 on veyron_minnie-kernelnext.
> TEST=ran tast with video.DecodeAccelVDH264 on veyron_minnie-kernelnext.
> TEST=ran tast with video.DecodeAccelVDVP8ResolutionSwitch on veyron_minnie.
> TEST=ran tast with video.DecodeAccelVDH264ResolutionSwitch on veyron_minnie.
> TEST=ran tast with video.DecodeAccelVDVP8 on veyron_minnie.
> TEST=ran tast with video.DecodeAccelVDH264 on veyron_minnie.
> 
> Signed-off-by: Francois Buergisser <fbuergisser@chromium.org>
> Change-Id: Icdceab06d3b263d0ce68993b3ee753bd650706dd
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1880208
> Commit-Queue: Alexandre Courbot <acourbot@chromium.org>
> Reviewed-by: Alexandre Courbot <acourbot@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#709376}

TBR=acourbot@chromium.org,fbuergisser@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: chromium:1009921
Change-Id: Ib3cf55aa900296f882372d4cf092e947115859e1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1890190Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710738}

media/gpu/v4l2/v4l2_device.cc

@@ -771,22 +771,6 @@ V4L2Queue::V4L2Queue(scoped_refptr<V4L2Device> dev,
       destroy_cb_(std::move(destroy_cb)),
       weak_this_factory_(this) {
   DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
-
-  // Check if this queue support requests.
-  struct v4l2_requestbuffers reqbufs;
-  memset(&reqbufs, 0, sizeof(reqbufs));
-  reqbufs.count = 0;
-  reqbufs.type = type;
-  reqbufs.memory = V4L2_MEMORY_MMAP;
-  if (device_->Ioctl(VIDIOC_REQBUFS, &reqbufs) != 0) {
-    VPLOGF(1) << "Request support checks's VIDIOC_REQBUFS ioctl failed.";
-    return;
-  }
-
-  if (reqbufs.capabilities & V4L2_BUF_CAP_SUPPORTS_REQUESTS) {
-    supports_requests_ = true;
-    VLOGF(1) << "Using request API.";
-  }
 }
 
 V4L2Queue::~V4L2Queue() {
@@ -1097,10 +1081,6 @@ size_t V4L2Queue::QueuedBuffersCount() const {
   return queued_buffers_.size();
 }
 
-bool V4L2Queue::SupportsRequests() {
-  return supports_requests_;
-}
-
 // This class is used to expose V4L2Queue's constructor to this module. This is
 // to ensure that nobody else can create instances of it.
 class V4L2QueueFactory {

media/gpu/v4l2/v4l2_device.h

@@ -338,9 +338,6 @@ class MEDIA_GPU_EXPORT V4L2Queue
   // Returns the number of buffers currently queued on this queue.
   size_t QueuedBuffersCount() const;
 
-  // Returns true if requests are supported by this queue.
-  bool SupportsRequests();
-
  private:
   ~V4L2Queue();
 
@@ -350,8 +347,6 @@ class MEDIA_GPU_EXPORT V4L2Queue
   const enum v4l2_buf_type type_;
   enum v4l2_memory memory_ = V4L2_MEMORY_MMAP;
   bool is_streaming_ = false;
-  // Set to true if the queue supports requests.
-  bool supports_requests_ = false;
   size_t planes_count_ = 0;
   // Current format as set by SetFormat.
   base::Optional<struct v4l2_format> current_format_;

media/gpu/v4l2/v4l2_video_decoder_backend_stateless.cc

@@ -124,7 +124,7 @@ V4L2StatelessVideoDecoderBackend::~V4L2StatelessVideoDecoderBackend() {
     avd_ = nullptr;
   }
 
-  if (input_queue_->SupportsRequests()) {
+  if (supports_requests_) {
     requests_ = {};
     media_fd_.reset();
   }
@@ -133,23 +133,15 @@ V4L2StatelessVideoDecoderBackend::~V4L2StatelessVideoDecoderBackend() {
 bool V4L2StatelessVideoDecoderBackend::Initialize() {
   DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
 
-  if (input_queue_->SupportsRequests()) {
-    DCHECK(!media_fd_.is_valid());
-    // Let's try to open the media device
-    // TODO(crbug.com/985230): remove this hardcoding, replace with V4L2Device
-    // integration.
-    int media_fd = open("/dev/media-dec0", O_RDWR, 0);
-    if (media_fd < 0) {
-      VPLOGF(1) << "Failed to open media device.";
+  if (!CheckRequestAPISupport()) {
+    VPLOGF(1) << "Failed to check request api support.";
     return false;
   }
-    media_fd_ = base::ScopedFD(media_fd);
-  }
 
   // Create codec-specific AcceleratedVideoDecoder.
   // TODO(akahuang): Check the profile is supported.
   if (profile_ >= H264PROFILE_MIN && profile_ <= H264PROFILE_MAX) {
-    if (input_queue_->SupportsRequests()) {
+    if (supports_requests_) {
       avd_.reset(new H264Decoder(
           std::make_unique<V4L2H264Accelerator>(this, device_.get())));
     } else {
@@ -157,7 +149,7 @@ bool V4L2StatelessVideoDecoderBackend::Initialize() {
           std::make_unique<V4L2LegacyH264Accelerator>(this, device_.get())));
     }
   } else if (profile_ >= VP8PROFILE_MIN && profile_ <= VP8PROFILE_MAX) {
-    if (input_queue_->SupportsRequests()) {
+    if (supports_requests_) {
       avd_.reset(new VP8Decoder(
           std::make_unique<V4L2VP8Accelerator>(this, device_.get())));
     } else {
@@ -172,7 +164,7 @@ bool V4L2StatelessVideoDecoderBackend::Initialize() {
     return false;
   }
 
-  if (input_queue_->SupportsRequests() && !AllocateRequests()) {
+  if (supports_requests_ && !AllocateRequests()) {
     return false;
   }
 
@@ -260,7 +252,7 @@ V4L2StatelessVideoDecoderBackend::CreateSurface() {
   }
 
   scoped_refptr<V4L2DecodeSurface> dec_surface;
-  if (input_queue_->SupportsRequests()) {
+  if (supports_requests_) {
     DCHECK(!requests_.empty());
     base::ScopedFD request = std::move(requests_.front());
     requests_.pop();
@@ -561,6 +553,39 @@ void V4L2StatelessVideoDecoderBackend::ClearPendingRequests(
   }
 }
 
+bool V4L2StatelessVideoDecoderBackend::CheckRequestAPISupport() {
+  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
+  DVLOGF(3);
+
+  struct v4l2_requestbuffers reqbufs;
+  memset(&reqbufs, 0, sizeof(reqbufs));
+  reqbufs.count = 0;
+  reqbufs.type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
+  reqbufs.memory = V4L2_MEMORY_MMAP;
+  if (device_->Ioctl(VIDIOC_REQBUFS, &reqbufs) != 0) {
+    VPLOGF(1) << "VIDIOC_REQBUFS ioctl failed.";
+    return false;
+  }
+  if (reqbufs.capabilities & V4L2_BUF_CAP_SUPPORTS_REQUESTS) {
+    supports_requests_ = true;
+    VLOGF(1) << "Using request API.";
+    DCHECK(!media_fd_.is_valid());
+    // Let's try to open the media device
+    // TODO(crbug.com/985230): remove this hardcoding, replace with V4L2Device
+    // integration.
+    int media_fd = open("/dev/media-dec0", O_RDWR, 0);
+    if (media_fd < 0) {
+      VPLOGF(1) << "Failed to open media device.";
+      return false;
+    }
+    media_fd_ = base::ScopedFD(media_fd);
+  } else {
+    VLOGF(1) << "Using config store.";
+  }
+
+  return true;
+}
+
 bool V4L2StatelessVideoDecoderBackend::AllocateRequests() {
   DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
   DVLOGF(3);

media/gpu/v4l2/v4l2_video_decoder_backend_stateless.h

@@ -117,6 +117,8 @@ class V4L2StatelessVideoDecoderBackend : public V4L2VideoDecoderBackend,
   // Setup the format of V4L2 output buffer, and allocate new buffer set.
   bool ChangeResolution();
 
+  // Check whether request api is supported or not.
+  bool CheckRequestAPISupport();
   // Allocate necessary request buffers is request api is supported.
   bool AllocateRequests();
 
@@ -156,6 +158,8 @@ class V4L2StatelessVideoDecoderBackend : public V4L2VideoDecoderBackend,
   // Callbacks of EOS buffer passed from Decode().
   VideoDecoder::DecodeCB flush_cb_;
 
+  // Set to true during Initialize() if the codec driver supports request API.
+  bool supports_requests_ = false;
   // FIFO queue of requests, only used if supports_requests_ is true.
   base::queue<base::ScopedFD> requests_;
   // Stores the media file descriptor, only used if supports_requests_ is true.