Migrate content/common/gpu/media code to media/gpu

content/common/gpu/media/vt_video_decode_accelerator_mac.cc

Index: content/common/gpu/media/vt_video_decode_accelerator_mac.cc
diff --git a/content/common/gpu/media/vt_video_decode_accelerator_mac.cc b/content/common/gpu/media/vt_video_decode_accelerator_mac.cc
deleted file mode 100644
index d832870f496248a462f37ec6899c8a1fc12577a2..0000000000000000000000000000000000000000
--- a/content/common/gpu/media/vt_video_decode_accelerator_mac.cc
+++ /dev/null
@@ -1,1159 +0,0 @@
-// Copyright 2014 The Chromium 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 "content/common/gpu/media/vt_video_decode_accelerator_mac.h"
-
-#include <CoreVideo/CoreVideo.h>
-#include <OpenGL/CGLIOSurface.h>
-#include <OpenGL/gl.h>
-#include <stddef.h>
-
-#include <algorithm>
-
-#include "base/bind.h"
-#include "base/logging.h"
-#include "base/mac/mac_logging.h"
-#include "base/macros.h"
-#include "base/memory/ptr_util.h"
-#include "base/metrics/histogram_macros.h"
-#include "base/sys_byteorder.h"
-#include "base/sys_info.h"
-#include "base/thread_task_runner_handle.h"
-#include "base/version.h"
-#include "media/base/limits.h"
-#include "ui/gl/gl_context.h"
-#include "ui/gl/gl_image_io_surface.h"
-#include "ui/gl/gl_implementation.h"
-#include "ui/gl/scoped_binders.h"
-
-using content_common_gpu_media::kModuleVt;
-using content_common_gpu_media::InitializeStubs;
-using content_common_gpu_media::IsVtInitialized;
-using content_common_gpu_media::StubPathMap;
-
-#define NOTIFY_STATUS(name, status, session_failure)   \
-    do {                                               \
-      OSSTATUS_DLOG(ERROR, status) << name;            \
-      NotifyError(PLATFORM_FAILURE, session_failure);  \
-    } while (0)
-
-namespace content {
-
-// Only H.264 with 4:2:0 chroma sampling is supported.
-static const media::VideoCodecProfile kSupportedProfiles[] = {
-  media::H264PROFILE_BASELINE,
-  media::H264PROFILE_MAIN,
-  media::H264PROFILE_EXTENDED,
-  media::H264PROFILE_HIGH,
-  // TODO(hubbe): Try to re-enable this again somehow. Currently it seems
-  // that some codecs fail to check the profile during initialization and
-  // then fail on the first frame decode, which currently results in a
-  // pipeline failure.
-  // media::H264PROFILE_HIGH10PROFILE,
-  media::H264PROFILE_SCALABLEBASELINE,
-  media::H264PROFILE_SCALABLEHIGH,
-  media::H264PROFILE_STEREOHIGH,
-  media::H264PROFILE_MULTIVIEWHIGH,
-};
-
-// Size to use for NALU length headers in AVC format (can be 1, 2, or 4).
-static const int kNALUHeaderLength = 4;
-
-// We request 5 picture buffers from the client, each of which has a texture ID
-// that we can bind decoded frames to. We need enough to satisfy preroll, and
-// enough to avoid unnecessary stalling, but no more than that. The resource
-// requirements are low, as we don't need the textures to be backed by storage.
-static const int kNumPictureBuffers = media::limits::kMaxVideoFrames + 1;
-
-// Maximum number of frames to queue for reordering before we stop asking for
-// more. (NotifyEndOfBitstreamBuffer() is called when frames are moved into the
-// reorder queue.)
-static const int kMaxReorderQueueSize = 16;
-
-// Build an |image_config| dictionary for VideoToolbox initialization.
-static base::ScopedCFTypeRef<CFMutableDictionaryRef>
-BuildImageConfig(CMVideoDimensions coded_dimensions) {
-  base::ScopedCFTypeRef<CFMutableDictionaryRef> image_config;
-
-  // Note that 4:2:0 textures cannot be used directly as RGBA in OpenGL, but are
-  // lower power than 4:2:2 when composited directly by CoreAnimation.
-  int32_t pixel_format = kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange;
-#define CFINT(i) CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &i)
-  base::ScopedCFTypeRef<CFNumberRef> cf_pixel_format(CFINT(pixel_format));
-  base::ScopedCFTypeRef<CFNumberRef> cf_width(CFINT(coded_dimensions.width));
-  base::ScopedCFTypeRef<CFNumberRef> cf_height(CFINT(coded_dimensions.height));
-#undef CFINT
-  if (!cf_pixel_format.get() || !cf_width.get() || !cf_height.get())
-    return image_config;
-
-  image_config.reset(
-      CFDictionaryCreateMutable(
-          kCFAllocatorDefault,
-          3,  // capacity
-          &kCFTypeDictionaryKeyCallBacks,
-          &kCFTypeDictionaryValueCallBacks));
-  if (!image_config.get())
-    return image_config;
-
-  CFDictionarySetValue(image_config, kCVPixelBufferPixelFormatTypeKey,
-                       cf_pixel_format);
-  CFDictionarySetValue(image_config, kCVPixelBufferWidthKey, cf_width);
-  CFDictionarySetValue(image_config, kCVPixelBufferHeightKey, cf_height);
-
-  return image_config;
-}
-
-// Create a VTDecompressionSession using the provided |pps| and |sps|. If
-// |require_hardware| is true, the session must uses real hardware decoding
-// (as opposed to software decoding inside of VideoToolbox) to be considered
-// successful.
-//
-// TODO(sandersd): Merge with ConfigureDecoder(), as the code is very similar.
-static bool CreateVideoToolboxSession(const uint8_t* sps, size_t sps_size,
-                                      const uint8_t* pps, size_t pps_size,
-                                      bool require_hardware) {
-  const uint8_t* data_ptrs[] = {sps, pps};
-  const size_t data_sizes[] = {sps_size, pps_size};
-
-  base::ScopedCFTypeRef<CMFormatDescriptionRef> format;
-  OSStatus status = CMVideoFormatDescriptionCreateFromH264ParameterSets(
-      kCFAllocatorDefault,
-      2,                    // parameter_set_count
-      data_ptrs,            // &parameter_set_pointers
-      data_sizes,           // &parameter_set_sizes
-      kNALUHeaderLength,    // nal_unit_header_length
-      format.InitializeInto());
-  if (status) {
-    OSSTATUS_DLOG(WARNING, status)
-        << "Failed to create CMVideoFormatDescription";
-    return false;
-  }
-
-  base::ScopedCFTypeRef<CFMutableDictionaryRef> decoder_config(
-      CFDictionaryCreateMutable(
-          kCFAllocatorDefault,
-          1,  // capacity
-          &kCFTypeDictionaryKeyCallBacks,
-          &kCFTypeDictionaryValueCallBacks));
-  if (!decoder_config.get())
-    return false;
-
-  if (require_hardware) {
-    CFDictionarySetValue(
-        decoder_config,
-        // kVTVideoDecoderSpecification_RequireHardwareAcceleratedVideoDecoder
-        CFSTR("RequireHardwareAcceleratedVideoDecoder"),
-        kCFBooleanTrue);
-  }
-
-  base::ScopedCFTypeRef<CFMutableDictionaryRef> image_config(
-      BuildImageConfig(CMVideoFormatDescriptionGetDimensions(format)));
-  if (!image_config.get())
-    return false;
-
-  VTDecompressionOutputCallbackRecord callback = {0};
-
-  base::ScopedCFTypeRef<VTDecompressionSessionRef> session;
-  status = VTDecompressionSessionCreate(
-      kCFAllocatorDefault,
-      format,               // video_format_description
-      decoder_config,       // video_decoder_specification
-      image_config,         // destination_image_buffer_attributes
-      &callback,            // output_callback
-      session.InitializeInto());
-  if (status) {
-    OSSTATUS_DLOG(WARNING, status)
-        << "Failed to create VTDecompressionSession";
-    return false;
-  }
-
-  return true;
-}
-
-// The purpose of this function is to preload the generic and hardware-specific
-// libraries required by VideoToolbox before the GPU sandbox is enabled.
-// VideoToolbox normally loads the hardware-specific libraries lazily, so we
-// must actually create a decompression session. If creating a decompression
-// session fails, hardware decoding will be disabled (Initialize() will always
-// return false).
-static bool InitializeVideoToolboxInternal() {
-  if (!IsVtInitialized()) {
-    // CoreVideo is also required, but the loader stops after the first path is
-    // loaded. Instead we rely on the transitive dependency from VideoToolbox to
-    // CoreVideo.
-    StubPathMap paths;
-    paths[kModuleVt].push_back(FILE_PATH_LITERAL(
-        "/System/Library/Frameworks/VideoToolbox.framework/VideoToolbox"));
-    if (!InitializeStubs(paths)) {
-      DLOG(WARNING) << "Failed to initialize VideoToolbox framework";
-      return false;
-    }
-  }
-
-  // Create a hardware decoding session.
-  // SPS and PPS data are taken from a 480p sample (buck2.mp4).
-  const uint8_t sps_normal[] = {0x67, 0x64, 0x00, 0x1e, 0xac, 0xd9, 0x80, 0xd4,
-                                0x3d, 0xa1, 0x00, 0x00, 0x03, 0x00, 0x01, 0x00,
-                                0x00, 0x03, 0x00, 0x30, 0x8f, 0x16, 0x2d, 0x9a};
-  const uint8_t pps_normal[] = {0x68, 0xe9, 0x7b, 0xcb};
-  if (!CreateVideoToolboxSession(sps_normal, arraysize(sps_normal), pps_normal,
-                                 arraysize(pps_normal), true)) {
-    DLOG(WARNING) << "Failed to create hardware VideoToolbox session";
-    return false;
-  }
-
-  // Create a software decoding session.
-  // SPS and PPS data are taken from a 18p sample (small2.mp4).
-  const uint8_t sps_small[] = {0x67, 0x64, 0x00, 0x0a, 0xac, 0xd9, 0x89, 0x7e,
-                               0x22, 0x10, 0x00, 0x00, 0x3e, 0x90, 0x00, 0x0e,
-                               0xa6, 0x08, 0xf1, 0x22, 0x59, 0xa0};
-  const uint8_t pps_small[] = {0x68, 0xe9, 0x79, 0x72, 0xc0};
-  if (!CreateVideoToolboxSession(sps_small, arraysize(sps_small), pps_small,
-                                 arraysize(pps_small), false)) {
-    DLOG(WARNING) << "Failed to create software VideoToolbox session";
-    return false;
-  }
-
-  return true;
-}
-
-bool InitializeVideoToolbox() {
-  // InitializeVideoToolbox() is called only from the GPU process main thread;
-  // once for sandbox warmup, and then once each time a VTVideoDecodeAccelerator
-  // is initialized.
-  static bool attempted = false;
-  static bool succeeded = false;
-
-  if (!attempted) {
-    attempted = true;
-    succeeded = InitializeVideoToolboxInternal();
-  }
-
-  return succeeded;
-}
-
-// Route decoded frame callbacks back into the VTVideoDecodeAccelerator.
-static void OutputThunk(
-    void* decompression_output_refcon,
-    void* source_frame_refcon,
-    OSStatus status,
-    VTDecodeInfoFlags info_flags,
-    CVImageBufferRef image_buffer,
-    CMTime presentation_time_stamp,
-    CMTime presentation_duration) {
-  VTVideoDecodeAccelerator* vda =
-      reinterpret_cast<VTVideoDecodeAccelerator*>(decompression_output_refcon);
-  vda->Output(source_frame_refcon, status, image_buffer);
-}
-
-VTVideoDecodeAccelerator::Task::Task(TaskType type) : type(type) {
-}
-
-VTVideoDecodeAccelerator::Task::Task(const Task& other) = default;
-
-VTVideoDecodeAccelerator::Task::~Task() {
-}
-
-VTVideoDecodeAccelerator::Frame::Frame(int32_t bitstream_id)
-    : bitstream_id(bitstream_id),
-      pic_order_cnt(0),
-      is_idr(false),
-      reorder_window(0) {
-}
-
-VTVideoDecodeAccelerator::Frame::~Frame() {
-}
-
-VTVideoDecodeAccelerator::PictureInfo::PictureInfo(uint32_t client_texture_id,
-                                                   uint32_t service_texture_id)
-    : client_texture_id(client_texture_id),
-      service_texture_id(service_texture_id) {}
-
-VTVideoDecodeAccelerator::PictureInfo::~PictureInfo() {
-  if (gl_image)
-    gl_image->Destroy(false);
-}
-
-bool VTVideoDecodeAccelerator::FrameOrder::operator()(
-    const linked_ptr<Frame>& lhs,
-    const linked_ptr<Frame>& rhs) const {
-  if (lhs->pic_order_cnt != rhs->pic_order_cnt)
-    return lhs->pic_order_cnt > rhs->pic_order_cnt;
-  // If |pic_order_cnt| is the same, fall back on using the bitstream order.
-  // TODO(sandersd): Assign a sequence number in Decode() and use that instead.
-  // TODO(sandersd): Using the sequence number, ensure that frames older than
-  // |kMaxReorderQueueSize| are ordered first, regardless of |pic_order_cnt|.
-  return lhs->bitstream_id > rhs->bitstream_id;
-}
-
-VTVideoDecodeAccelerator::VTVideoDecodeAccelerator(
-    const MakeGLContextCurrentCallback& make_context_current_cb,
-    const BindGLImageCallback& bind_image_cb)
-    : make_context_current_cb_(make_context_current_cb),
-      bind_image_cb_(bind_image_cb),
-      client_(nullptr),
-      state_(STATE_DECODING),
-      format_(nullptr),
-      session_(nullptr),
-      last_sps_id_(-1),
-      last_pps_id_(-1),
-      config_changed_(false),
-      waiting_for_idr_(true),
-      missing_idr_logged_(false),
-      gpu_task_runner_(base::ThreadTaskRunnerHandle::Get()),
-      decoder_thread_("VTDecoderThread"),
-      weak_this_factory_(this) {
-  callback_.decompressionOutputCallback = OutputThunk;
-  callback_.decompressionOutputRefCon = this;
-  weak_this_ = weak_this_factory_.GetWeakPtr();
-}
-
-VTVideoDecodeAccelerator::~VTVideoDecodeAccelerator() {
-  DCHECK(gpu_thread_checker_.CalledOnValidThread());
-}
-
-bool VTVideoDecodeAccelerator::Initialize(const Config& config,
-                                          Client* client) {
-  DCHECK(gpu_thread_checker_.CalledOnValidThread());
-
-  if (make_context_current_cb_.is_null() || bind_image_cb_.is_null()) {
-    NOTREACHED() << "GL callbacks are required for this VDA";
-    return false;
-  }
-
-  if (config.is_encrypted) {
-    NOTREACHED() << "Encrypted streams are not supported for this VDA";
-    return false;
-  }
-
-  client_ = client;
-
-  if (!InitializeVideoToolbox())
-    return false;
-
-  bool profile_supported = false;
-  for (const auto& supported_profile : kSupportedProfiles) {
-    if (config.profile == supported_profile) {
-      profile_supported = true;
-      break;
-    }
-  }
-  if (!profile_supported)
-    return false;
-
-  // Spawn a thread to handle parsing and calling VideoToolbox.
-  if (!decoder_thread_.Start())
-    return false;
-
-  // Count the session as successfully initialized.
-  UMA_HISTOGRAM_ENUMERATION("Media.VTVDA.SessionFailureReason",
-                            SFT_SUCCESSFULLY_INITIALIZED,
-                            SFT_MAX + 1);
-  return true;
-}
-
-bool VTVideoDecodeAccelerator::FinishDelayedFrames() {
-  DCHECK(decoder_thread_.task_runner()->BelongsToCurrentThread());
-  if (session_) {
-    OSStatus status = VTDecompressionSessionWaitForAsynchronousFrames(session_);
-    if (status) {
-      NOTIFY_STATUS("VTDecompressionSessionWaitForAsynchronousFrames()",
-                    status, SFT_PLATFORM_ERROR);
-      return false;
-    }
-  }
-  return true;
-}
-
-bool VTVideoDecodeAccelerator::ConfigureDecoder() {
-  DCHECK(decoder_thread_.task_runner()->BelongsToCurrentThread());
-  DCHECK(!last_sps_.empty());
-  DCHECK(!last_pps_.empty());
-
-  // Build the configuration records.
-  std::vector<const uint8_t*> nalu_data_ptrs;
-  std::vector<size_t> nalu_data_sizes;
-  nalu_data_ptrs.reserve(3);
-  nalu_data_sizes.reserve(3);
-  nalu_data_ptrs.push_back(&last_sps_.front());
-  nalu_data_sizes.push_back(last_sps_.size());
-  if (!last_spsext_.empty()) {
-    nalu_data_ptrs.push_back(&last_spsext_.front());
-    nalu_data_sizes.push_back(last_spsext_.size());
-  }
-  nalu_data_ptrs.push_back(&last_pps_.front());
-  nalu_data_sizes.push_back(last_pps_.size());
-
-  // Construct a new format description from the parameter sets.
-  format_.reset();
-  OSStatus status = CMVideoFormatDescriptionCreateFromH264ParameterSets(
-      kCFAllocatorDefault,
-      nalu_data_ptrs.size(),      // parameter_set_count
-      &nalu_data_ptrs.front(),    // &parameter_set_pointers
-      &nalu_data_sizes.front(),   // &parameter_set_sizes
-      kNALUHeaderLength,          // nal_unit_header_length
-      format_.InitializeInto());
-  if (status) {
-    NOTIFY_STATUS("CMVideoFormatDescriptionCreateFromH264ParameterSets()",
-                  status, SFT_PLATFORM_ERROR);
-    return false;
-  }
-
-  // Store the new configuration data.
-  // TODO(sandersd): Despite the documentation, this seems to return the visible
-  // size. However, the output always appears to be top-left aligned, so it
-  // makes no difference. Re-verify this and update the variable name.
-  CMVideoDimensions coded_dimensions =
-      CMVideoFormatDescriptionGetDimensions(format_);
-  coded_size_.SetSize(coded_dimensions.width, coded_dimensions.height);
-
-  // Prepare VideoToolbox configuration dictionaries.
-  base::ScopedCFTypeRef<CFMutableDictionaryRef> decoder_config(
-      CFDictionaryCreateMutable(
-          kCFAllocatorDefault,
-          1,  // capacity
-          &kCFTypeDictionaryKeyCallBacks,
-          &kCFTypeDictionaryValueCallBacks));
-  if (!decoder_config.get()) {
-    DLOG(ERROR) << "Failed to create CFMutableDictionary";
-    NotifyError(PLATFORM_FAILURE, SFT_PLATFORM_ERROR);
-    return false;
-  }
-
-  CFDictionarySetValue(
-      decoder_config,
-      // kVTVideoDecoderSpecification_EnableHardwareAcceleratedVideoDecoder
-      CFSTR("EnableHardwareAcceleratedVideoDecoder"),
-      kCFBooleanTrue);
-
-  base::ScopedCFTypeRef<CFMutableDictionaryRef> image_config(
-      BuildImageConfig(coded_dimensions));
-  if (!image_config.get()) {
-    DLOG(ERROR) << "Failed to create decoder image configuration";
-    NotifyError(PLATFORM_FAILURE, SFT_PLATFORM_ERROR);
-    return false;
-  }
-
-  // Ensure that the old decoder emits all frames before the new decoder can
-  // emit any.
-  if (!FinishDelayedFrames())
-    return false;
-
-  session_.reset();
-  status = VTDecompressionSessionCreate(
-      kCFAllocatorDefault,
-      format_,              // video_format_description
-      decoder_config,       // video_decoder_specification
-      image_config,         // destination_image_buffer_attributes
-      &callback_,           // output_callback
-      session_.InitializeInto());
-  if (status) {
-    NOTIFY_STATUS("VTDecompressionSessionCreate()", status,
-                  SFT_UNSUPPORTED_STREAM_PARAMETERS);
-    return false;
-  }
-
-  // Report whether hardware decode is being used.
-  bool using_hardware = false;
-  base::ScopedCFTypeRef<CFBooleanRef> cf_using_hardware;
-  if (VTSessionCopyProperty(
-          session_,
-          // kVTDecompressionPropertyKey_UsingHardwareAcceleratedVideoDecoder
-          CFSTR("UsingHardwareAcceleratedVideoDecoder"),
-          kCFAllocatorDefault,
-          cf_using_hardware.InitializeInto()) == 0) {
-    using_hardware = CFBooleanGetValue(cf_using_hardware);
-  }
-  UMA_HISTOGRAM_BOOLEAN("Media.VTVDA.HardwareAccelerated", using_hardware);
-
-  return true;
-}
-
-void VTVideoDecodeAccelerator::DecodeTask(
-    const media::BitstreamBuffer& bitstream,
-    Frame* frame) {
-  DCHECK(decoder_thread_.task_runner()->BelongsToCurrentThread());
-
-  // Map the bitstream buffer.
-  base::SharedMemory memory(bitstream.handle(), true);
-  size_t size = bitstream.size();
-  if (!memory.Map(size)) {
-    DLOG(ERROR) << "Failed to map bitstream buffer";
-    NotifyError(PLATFORM_FAILURE, SFT_PLATFORM_ERROR);
-    return;
-  }
-  const uint8_t* buf = static_cast<uint8_t*>(memory.memory());
-
-  // NALUs are stored with Annex B format in the bitstream buffer (start codes),
-  // but VideoToolbox expects AVC format (length headers), so we must rewrite
-  // the data.
-  //
-  // Locate relevant NALUs and compute the size of the rewritten data. Also
-  // record any parameter sets for VideoToolbox initialization.
-  std::vector<uint8_t> sps;
-  std::vector<uint8_t> spsext;
-  std::vector<uint8_t> pps;
-  bool has_slice = false;
-  size_t data_size = 0;
-  std::vector<media::H264NALU> nalus;
-  parser_.SetStream(buf, size);
-  media::H264NALU nalu;
-  while (true) {
-    media::H264Parser::Result result = parser_.AdvanceToNextNALU(&nalu);
-    if (result == media::H264Parser::kEOStream)
-      break;
-    if (result == media::H264Parser::kUnsupportedStream) {
-      DLOG(ERROR) << "Unsupported H.264 stream";
-      NotifyError(PLATFORM_FAILURE, SFT_UNSUPPORTED_STREAM);
-      return;
-    }
-    if (result != media::H264Parser::kOk) {
-      DLOG(ERROR) << "Failed to parse H.264 stream";
-      NotifyError(UNREADABLE_INPUT, SFT_INVALID_STREAM);
-      return;
-    }
-    switch (nalu.nal_unit_type) {
-      case media::H264NALU::kSPS:
-        result = parser_.ParseSPS(&last_sps_id_);
-        if (result == media::H264Parser::kUnsupportedStream) {
-          DLOG(ERROR) << "Unsupported SPS";
-          NotifyError(PLATFORM_FAILURE, SFT_UNSUPPORTED_STREAM);
-          return;
-        }
-        if (result != media::H264Parser::kOk) {
-          DLOG(ERROR) << "Could not parse SPS";
-          NotifyError(UNREADABLE_INPUT, SFT_INVALID_STREAM);
-          return;
-        }
-        sps.assign(nalu.data, nalu.data + nalu.size);
-        spsext.clear();
-        break;
-
-      case media::H264NALU::kSPSExt:
-        // TODO(sandersd): Check that the previous NALU was an SPS.
-        spsext.assign(nalu.data, nalu.data + nalu.size);
-        break;
-
-      case media::H264NALU::kPPS:
-        result = parser_.ParsePPS(&last_pps_id_);
-        if (result == media::H264Parser::kUnsupportedStream) {
-          DLOG(ERROR) << "Unsupported PPS";
-          NotifyError(PLATFORM_FAILURE, SFT_UNSUPPORTED_STREAM);
-          return;
-        }
-        if (result != media::H264Parser::kOk) {
-          DLOG(ERROR) << "Could not parse PPS";
-          NotifyError(UNREADABLE_INPUT, SFT_INVALID_STREAM);
-          return;
-        }
-        pps.assign(nalu.data, nalu.data + nalu.size);
-        break;
-
-      case media::H264NALU::kSliceDataA:
-      case media::H264NALU::kSliceDataB:
-      case media::H264NALU::kSliceDataC:
-      case media::H264NALU::kNonIDRSlice:
-      case media::H264NALU::kIDRSlice:
-        // Compute the |pic_order_cnt| for the picture from the first slice.
-        if (!has_slice) {
-          // Verify that we are not trying to decode a slice without an IDR.
-          if (waiting_for_idr_) {
-            if (nalu.nal_unit_type == media::H264NALU::kIDRSlice) {
-              waiting_for_idr_ = false;
-            } else {
-              // We can't compute anything yet, bail on this frame.
-              has_slice = true;
-              break;
-            }
-          }
-
-          media::H264SliceHeader slice_hdr;
-          result = parser_.ParseSliceHeader(nalu, &slice_hdr);
-          if (result == media::H264Parser::kUnsupportedStream) {
-            DLOG(ERROR) << "Unsupported slice header";
-            NotifyError(PLATFORM_FAILURE, SFT_UNSUPPORTED_STREAM);
-            return;
-          }
-          if (result != media::H264Parser::kOk) {
-            DLOG(ERROR) << "Could not parse slice header";
-            NotifyError(UNREADABLE_INPUT, SFT_INVALID_STREAM);
-            return;
-          }
-
-          // TODO(sandersd): Maintain a cache of configurations and reconfigure
-          // when a slice references a new config.
-          DCHECK_EQ(slice_hdr.pic_parameter_set_id, last_pps_id_);
-          const media::H264PPS* pps =
-              parser_.GetPPS(slice_hdr.pic_parameter_set_id);
-          if (!pps) {
-            DLOG(ERROR) << "Mising PPS referenced by slice";
-            NotifyError(UNREADABLE_INPUT, SFT_INVALID_STREAM);
-            return;
-          }
-
-          DCHECK_EQ(pps->seq_parameter_set_id, last_sps_id_);
-          const media::H264SPS* sps = parser_.GetSPS(pps->seq_parameter_set_id);
-          if (!sps) {
-            DLOG(ERROR) << "Mising SPS referenced by PPS";
-            NotifyError(UNREADABLE_INPUT, SFT_INVALID_STREAM);
-            return;
-          }
-
-          if (!poc_.ComputePicOrderCnt(sps, slice_hdr, &frame->pic_order_cnt)) {
-            DLOG(ERROR) << "Unable to compute POC";
-            NotifyError(UNREADABLE_INPUT, SFT_INVALID_STREAM);
-            return;
-          }
-
-          if (nalu.nal_unit_type == media::H264NALU::kIDRSlice)
-            frame->is_idr = true;
-
-          if (sps->vui_parameters_present_flag &&
-              sps->bitstream_restriction_flag) {
-            frame->reorder_window = std::min(sps->max_num_reorder_frames,
-                                             kMaxReorderQueueSize - 1);
-          }
-        }
-        has_slice = true;
-      default:
-        nalus.push_back(nalu);
-        data_size += kNALUHeaderLength + nalu.size;
-        break;
-    }
-  }
-
-  // Initialize VideoToolbox.
-  if (!sps.empty() && sps != last_sps_) {
-    last_sps_.swap(sps);
-    last_spsext_.swap(spsext);
-    config_changed_ = true;
-  }
-  if (!pps.empty() && pps != last_pps_) {
-    last_pps_.swap(pps);
-    config_changed_ = true;
-  }
-  if (config_changed_) {
-    // Only reconfigure at IDRs to avoid corruption.
-    if (frame->is_idr) {
-      config_changed_ = false;
-
-      if (last_sps_.empty()) {
-        DLOG(ERROR) << "Invalid configuration; no SPS";
-        NotifyError(INVALID_ARGUMENT, SFT_INVALID_STREAM);
-        return;
-      }
-      if (last_pps_.empty()) {
-        DLOG(ERROR) << "Invalid configuration; no PPS";
-        NotifyError(INVALID_ARGUMENT, SFT_INVALID_STREAM);
-        return;
-      }
-
-      // ConfigureDecoder() calls NotifyError() on failure.
-      if (!ConfigureDecoder())
-        return;
-    }
-  }
-
-  // If no IDR has been seen yet, skip decoding.
-  if (has_slice && (!session_ || waiting_for_idr_) && config_changed_) {
-    if (!missing_idr_logged_) {
-      LOG(ERROR) << "Illegal attempt to decode without IDR. "
-                 << "Discarding decode requests until next IDR.";
-      missing_idr_logged_ = true;
-    }
-    has_slice = false;
-  }
-
-  // If there is nothing to decode, drop the bitstream buffer by returning an
-  // empty frame.
-  if (!has_slice) {
-    // Keep everything in order by flushing first.
-    if (!FinishDelayedFrames())
-      return;
-    gpu_task_runner_->PostTask(FROM_HERE, base::Bind(
-        &VTVideoDecodeAccelerator::DecodeDone, weak_this_, frame));
-    return;
-  }
-
-  // If the session is not configured by this point, fail.
-  if (!session_) {
-    DLOG(ERROR) << "Cannot decode without configuration";
-    NotifyError(INVALID_ARGUMENT, SFT_INVALID_STREAM);
-    return;
-  }
-
-  // Update the frame metadata with configuration data.
-  frame->coded_size = coded_size_;
-
-  // Create a memory-backed CMBlockBuffer for the translated data.
-  // TODO(sandersd): Pool of memory blocks.
-  base::ScopedCFTypeRef<CMBlockBufferRef> data;
-  OSStatus status = CMBlockBufferCreateWithMemoryBlock(
-      kCFAllocatorDefault,
-      nullptr,              // &memory_block
-      data_size,            // block_length
-      kCFAllocatorDefault,  // block_allocator
-      nullptr,              // &custom_block_source
-      0,                    // offset_to_data
-      data_size,            // data_length
-      0,                    // flags
-      data.InitializeInto());
-  if (status) {
-    NOTIFY_STATUS("CMBlockBufferCreateWithMemoryBlock()", status,
-                  SFT_PLATFORM_ERROR);
-    return;
-  }
-
-  // Make sure that the memory is actually allocated.
-  // CMBlockBufferReplaceDataBytes() is documented to do this, but prints a
-  // message each time starting in Mac OS X 10.10.
-  status = CMBlockBufferAssureBlockMemory(data);
-  if (status) {
-    NOTIFY_STATUS("CMBlockBufferAssureBlockMemory()", status,
-                  SFT_PLATFORM_ERROR);
-    return;
-  }
-
-  // Copy NALU data into the CMBlockBuffer, inserting length headers.
-  size_t offset = 0;
-  for (size_t i = 0; i < nalus.size(); i++) {
-    media::H264NALU& nalu = nalus[i];
-    uint32_t header = base::HostToNet32(static_cast<uint32_t>(nalu.size));
-    status = CMBlockBufferReplaceDataBytes(
-        &header, data, offset, kNALUHeaderLength);
-    if (status) {
-      NOTIFY_STATUS("CMBlockBufferReplaceDataBytes()", status,
-                    SFT_PLATFORM_ERROR);
-      return;
-    }
-    offset += kNALUHeaderLength;
-    status = CMBlockBufferReplaceDataBytes(nalu.data, data, offset, nalu.size);
-    if (status) {
-      NOTIFY_STATUS("CMBlockBufferReplaceDataBytes()", status,
-                    SFT_PLATFORM_ERROR);
-      return;
-    }
-    offset += nalu.size;
-  }
-
-  // Package the data in a CMSampleBuffer.
-  base::ScopedCFTypeRef<CMSampleBufferRef> sample;
-  status = CMSampleBufferCreate(
-      kCFAllocatorDefault,
-      data,                 // data_buffer
-      true,                 // data_ready
-      nullptr,              // make_data_ready_callback
-      nullptr,              // make_data_ready_refcon
-      format_,              // format_description
-      1,                    // num_samples
-      0,                    // num_sample_timing_entries
-      nullptr,              // &sample_timing_array
-      1,                    // num_sample_size_entries
-      &data_size,           // &sample_size_array
-      sample.InitializeInto());
-  if (status) {
-    NOTIFY_STATUS("CMSampleBufferCreate()", status, SFT_PLATFORM_ERROR);
-    return;
-  }
-
-  // Send the frame for decoding.
-  // Asynchronous Decompression allows for parallel submission of frames
-  // (without it, DecodeFrame() does not return until the frame has been
-  // decoded). We don't enable Temporal Processing so that frames are always
-  // returned in decode order; this makes it easier to avoid deadlock.
-  VTDecodeFrameFlags decode_flags =
-      kVTDecodeFrame_EnableAsynchronousDecompression;
-  status = VTDecompressionSessionDecodeFrame(
-      session_,
-      sample,                                 // sample_buffer
-      decode_flags,                           // decode_flags
-      reinterpret_cast<void*>(frame),         // source_frame_refcon
-      nullptr);                               // &info_flags_out
-  if (status) {
-    NOTIFY_STATUS("VTDecompressionSessionDecodeFrame()", status,
-                  SFT_DECODE_ERROR);
-    return;
-  }
-}
-
-// This method may be called on any VideoToolbox thread.
-void VTVideoDecodeAccelerator::Output(
-    void* source_frame_refcon,
-    OSStatus status,
-    CVImageBufferRef image_buffer) {
-  if (status) {
-    NOTIFY_STATUS("Decoding", status, SFT_DECODE_ERROR);
-    return;
-  }
-
-  // The type of |image_buffer| is CVImageBuffer, but we only handle
-  // CVPixelBuffers. This should be guaranteed as we set
-  // kCVPixelBufferOpenGLCompatibilityKey in |image_config|.
-  //
-  // Sometimes, for unknown reasons (http://crbug.com/453050), |image_buffer| is
-  // NULL, which causes CFGetTypeID() to crash. While the rest of the code would
-  // smoothly handle NULL as a dropped frame, we choose to fail permanantly here
-  // until the issue is better understood.
-  if (!image_buffer || CFGetTypeID(image_buffer) != CVPixelBufferGetTypeID()) {
-    DLOG(ERROR) << "Decoded frame is not a CVPixelBuffer";
-    NotifyError(PLATFORM_FAILURE, SFT_DECODE_ERROR);
-    return;
-  }
-
-  Frame* frame = reinterpret_cast<Frame*>(source_frame_refcon);
-  frame->image.reset(image_buffer, base::scoped_policy::RETAIN);
-  gpu_task_runner_->PostTask(FROM_HERE, base::Bind(
-      &VTVideoDecodeAccelerator::DecodeDone, weak_this_, frame));
-}
-
-void VTVideoDecodeAccelerator::DecodeDone(Frame* frame) {
-  DCHECK(gpu_thread_checker_.CalledOnValidThread());
-  DCHECK_EQ(1u, pending_frames_.count(frame->bitstream_id));
-  Task task(TASK_FRAME);
-  task.frame = pending_frames_[frame->bitstream_id];
-  pending_frames_.erase(frame->bitstream_id);
-  task_queue_.push(task);
-  ProcessWorkQueues();
-}
-
-void VTVideoDecodeAccelerator::FlushTask(TaskType type) {
-  DCHECK(decoder_thread_.task_runner()->BelongsToCurrentThread());
-  FinishDelayedFrames();
-
-  // Always queue a task, even if FinishDelayedFrames() fails, so that
-  // destruction always completes.
-  gpu_task_runner_->PostTask(FROM_HERE, base::Bind(
-      &VTVideoDecodeAccelerator::FlushDone, weak_this_, type));
-}
-
-void VTVideoDecodeAccelerator::FlushDone(TaskType type) {
-  DCHECK(gpu_thread_checker_.CalledOnValidThread());
-  task_queue_.push(Task(type));
-  ProcessWorkQueues();
-}
-
-void VTVideoDecodeAccelerator::Decode(const media::BitstreamBuffer& bitstream) {
-  DCHECK(gpu_thread_checker_.CalledOnValidThread());
-  if (bitstream.id() < 0) {
-    DLOG(ERROR) << "Invalid bitstream, id: " << bitstream.id();
-    if (base::SharedMemory::IsHandleValid(bitstream.handle()))
-      base::SharedMemory::CloseHandle(bitstream.handle());
-    NotifyError(INVALID_ARGUMENT, SFT_INVALID_STREAM);
-    return;
-  }
-  DCHECK_EQ(0u, assigned_bitstream_ids_.count(bitstream.id()));
-  assigned_bitstream_ids_.insert(bitstream.id());
-  Frame* frame = new Frame(bitstream.id());
-  pending_frames_[frame->bitstream_id] = make_linked_ptr(frame);
-  decoder_thread_.task_runner()->PostTask(
-      FROM_HERE, base::Bind(&VTVideoDecodeAccelerator::DecodeTask,
-                            base::Unretained(this), bitstream, frame));
-}
-
-void VTVideoDecodeAccelerator::AssignPictureBuffers(
-    const std::vector<media::PictureBuffer>& pictures) {
-  DCHECK(gpu_thread_checker_.CalledOnValidThread());
-
-  for (const media::PictureBuffer& picture : pictures) {
-    DCHECK(!picture_info_map_.count(picture.id()));
-    assigned_picture_ids_.insert(picture.id());
-    available_picture_ids_.push_back(picture.id());
-    DCHECK_LE(1u, picture.internal_texture_ids().size());
-    DCHECK_LE(1u, picture.texture_ids().size());
-    picture_info_map_.insert(std::make_pair(
-        picture.id(),
-        base::WrapUnique(new PictureInfo(picture.internal_texture_ids()[0],
-                                         picture.texture_ids()[0]))));
-  }
-
-  // Pictures are not marked as uncleared until after this method returns, and
-  // they will be broken if they are used before that happens. So, schedule
-  // future work after that happens.
-  gpu_task_runner_->PostTask(FROM_HERE, base::Bind(
-      &VTVideoDecodeAccelerator::ProcessWorkQueues, weak_this_));
-}
-
-void VTVideoDecodeAccelerator::ReusePictureBuffer(int32_t picture_id) {
-  DCHECK(gpu_thread_checker_.CalledOnValidThread());
-  DCHECK(picture_info_map_.count(picture_id));
-  PictureInfo* picture_info = picture_info_map_.find(picture_id)->second.get();
-  picture_info->cv_image.reset();
-  picture_info->gl_image->Destroy(false);
-  picture_info->gl_image = nullptr;
-
-  if (assigned_picture_ids_.count(picture_id) != 0) {
-    available_picture_ids_.push_back(picture_id);
-    ProcessWorkQueues();
-  } else {
-    client_->DismissPictureBuffer(picture_id);
-  }
-}
-
-void VTVideoDecodeAccelerator::ProcessWorkQueues() {
-  DCHECK(gpu_thread_checker_.CalledOnValidThread());
-  switch (state_) {
-    case STATE_DECODING:
-      // TODO(sandersd): Batch where possible.
-      while (state_ == STATE_DECODING) {
-        if (!ProcessReorderQueue() && !ProcessTaskQueue())
-          break;
-      }
-      return;
-
-    case STATE_ERROR:
-      // Do nothing until Destroy() is called.
-      return;
-
-    case STATE_DESTROYING:
-      // Drop tasks until we are ready to destruct.
-      while (!task_queue_.empty()) {
-        if (task_queue_.front().type == TASK_DESTROY) {
-          delete this;
-          return;
-        }
-        task_queue_.pop();
-      }
-      return;
-  }
-}
-
-bool VTVideoDecodeAccelerator::ProcessTaskQueue() {
-  DCHECK(gpu_thread_checker_.CalledOnValidThread());
-  DCHECK_EQ(state_, STATE_DECODING);
-
-  if (task_queue_.empty())
-    return false;
-
-  const Task& task = task_queue_.front();
-  switch (task.type) {
-    case TASK_FRAME:
-      if (reorder_queue_.size() < kMaxReorderQueueSize &&
-          (!task.frame->is_idr || reorder_queue_.empty())) {
-        assigned_bitstream_ids_.erase(task.frame->bitstream_id);
-        client_->NotifyEndOfBitstreamBuffer(task.frame->bitstream_id);
-        reorder_queue_.push(task.frame);
-        task_queue_.pop();
-        return true;
-      }
-      return false;
-
-    case TASK_FLUSH:
-      DCHECK_EQ(task.type, pending_flush_tasks_.front());
-      if (reorder_queue_.size() == 0) {
-        pending_flush_tasks_.pop();
-        client_->NotifyFlushDone();
-        task_queue_.pop();
-        return true;
-      }
-      return false;
-
-    case TASK_RESET:
-      DCHECK_EQ(task.type, pending_flush_tasks_.front());
-      if (reorder_queue_.size() == 0) {
-        waiting_for_idr_ = true;
-        pending_flush_tasks_.pop();
-        client_->NotifyResetDone();
-        task_queue_.pop();
-        return true;
-      }
-      return false;
-
-    case TASK_DESTROY:
-      NOTREACHED() << "Can't destroy while in STATE_DECODING";
-      NotifyError(ILLEGAL_STATE, SFT_PLATFORM_ERROR);
-      return false;
-  }
-}
-
-bool VTVideoDecodeAccelerator::ProcessReorderQueue() {
-  DCHECK(gpu_thread_checker_.CalledOnValidThread());
-  DCHECK_EQ(state_, STATE_DECODING);
-
-  if (reorder_queue_.empty())
-    return false;
-
-  // If the next task is a flush (because there is a pending flush or becuase
-  // the next frame is an IDR), then we don't need a full reorder buffer to send
-  // the next frame.
-  bool flushing = !task_queue_.empty() &&
-                  (task_queue_.front().type != TASK_FRAME ||
-                   task_queue_.front().frame->is_idr);
-
-  size_t reorder_window = std::max(0, reorder_queue_.top()->reorder_window);
-  if (flushing || reorder_queue_.size() > reorder_window) {
-    if (ProcessFrame(*reorder_queue_.top())) {
-      reorder_queue_.pop();
-      return true;
-    }
-  }
-
-  return false;
-}
-
-bool VTVideoDecodeAccelerator::ProcessFrame(const Frame& frame) {
-  DCHECK(gpu_thread_checker_.CalledOnValidThread());
-  DCHECK_EQ(state_, STATE_DECODING);
-
-  // If the next pending flush is for a reset, then the frame will be dropped.
-  bool resetting = !pending_flush_tasks_.empty() &&
-                   pending_flush_tasks_.front() == TASK_RESET;
-
-  if (!resetting && frame.image.get()) {
-    // If the |coded_size| has changed, request new picture buffers and then
-    // wait for them.
-    // TODO(sandersd): If GpuVideoDecoder didn't specifically check the size of
-    // textures, this would be unnecessary, as the size is actually a property
-    // of the texture binding, not the texture. We rebind every frame, so the
-    // size passed to ProvidePictureBuffers() is meaningless.
-    if (picture_size_ != frame.coded_size) {
-      // Dismiss current pictures.
-      for (int32_t picture_id : assigned_picture_ids_)
-        client_->DismissPictureBuffer(picture_id);
-      assigned_picture_ids_.clear();
-      available_picture_ids_.clear();
-
-      // Request new pictures.
-      picture_size_ = frame.coded_size;
-      client_->ProvidePictureBuffers(kNumPictureBuffers, 1, coded_size_,
-                                     GL_TEXTURE_RECTANGLE_ARB);
-      return false;
-    }
-    if (!SendFrame(frame))
-      return false;
-  }
-
-  return true;
-}
-
-bool VTVideoDecodeAccelerator::SendFrame(const Frame& frame) {
-  DCHECK(gpu_thread_checker_.CalledOnValidThread());
-  DCHECK_EQ(state_, STATE_DECODING);
-
-  if (available_picture_ids_.empty())
-    return false;
-
-  int32_t picture_id = available_picture_ids_.back();
-  DCHECK(picture_info_map_.count(picture_id));
-  PictureInfo* picture_info = picture_info_map_.find(picture_id)->second.get();
-  DCHECK(!picture_info->cv_image);
-  DCHECK(!picture_info->gl_image);
-
-  if (!make_context_current_cb_.Run()) {
-    DLOG(ERROR) << "Failed to make GL context current";
-    NotifyError(PLATFORM_FAILURE, SFT_PLATFORM_ERROR);
-    return false;
-  }
-
-  scoped_refptr<gl::GLImageIOSurface> gl_image(
-      new gl::GLImageIOSurface(frame.coded_size, GL_BGRA_EXT));
-  if (!gl_image->InitializeWithCVPixelBuffer(
-          frame.image.get(), gfx::GenericSharedMemoryId(),
-          gfx::BufferFormat::YUV_420_BIPLANAR)) {
-    NOTIFY_STATUS("Failed to initialize GLImageIOSurface", PLATFORM_FAILURE,
-        SFT_PLATFORM_ERROR);
-  }
-
-  if (!bind_image_cb_.Run(picture_info->client_texture_id,
-                          GL_TEXTURE_RECTANGLE_ARB, gl_image, false)) {
-    DLOG(ERROR) << "Failed to bind image";
-    NotifyError(PLATFORM_FAILURE, SFT_PLATFORM_ERROR);
-    return false;
-  }
-
-  // Assign the new image(s) to the the picture info.
-  picture_info->gl_image = gl_image;
-  picture_info->cv_image = frame.image;
-  available_picture_ids_.pop_back();
-
-  // TODO(sandersd): Currently, the size got from
-  // CMVideoFormatDescriptionGetDimensions is visible size. We pass it to
-  // GpuVideoDecoder so that GpuVideoDecoder can use correct visible size in
-  // resolution changed. We should find the correct API to get the real
-  // coded size and fix it.
-  client_->PictureReady(media::Picture(picture_id, frame.bitstream_id,
-                                       gfx::Rect(frame.coded_size),
-                                       true));
-  return true;
-}
-
-void VTVideoDecodeAccelerator::NotifyError(
-    Error vda_error_type,
-    VTVDASessionFailureType session_failure_type) {
-  DCHECK_LT(session_failure_type, SFT_MAX + 1);
-  if (!gpu_thread_checker_.CalledOnValidThread()) {
-    gpu_task_runner_->PostTask(FROM_HERE, base::Bind(
-        &VTVideoDecodeAccelerator::NotifyError, weak_this_, vda_error_type,
-        session_failure_type));
-  } else if (state_ == STATE_DECODING) {
-    state_ = STATE_ERROR;
-    UMA_HISTOGRAM_ENUMERATION("Media.VTVDA.SessionFailureReason",
-                              session_failure_type,
-                              SFT_MAX + 1);
-    client_->NotifyError(vda_error_type);
-  }
-}
-
-void VTVideoDecodeAccelerator::QueueFlush(TaskType type) {
-  DCHECK(gpu_thread_checker_.CalledOnValidThread());
-  pending_flush_tasks_.push(type);
-  decoder_thread_.task_runner()->PostTask(
-      FROM_HERE, base::Bind(&VTVideoDecodeAccelerator::FlushTask,
-                            base::Unretained(this), type));
-
-  // If this is a new flush request, see if we can make progress.
-  if (pending_flush_tasks_.size() == 1)
-    ProcessWorkQueues();
-}
-
-void VTVideoDecodeAccelerator::Flush() {
-  DCHECK(gpu_thread_checker_.CalledOnValidThread());
-  QueueFlush(TASK_FLUSH);
-}
-
-void VTVideoDecodeAccelerator::Reset() {
-  DCHECK(gpu_thread_checker_.CalledOnValidThread());
-  QueueFlush(TASK_RESET);
-}
-
-void VTVideoDecodeAccelerator::Destroy() {
-  DCHECK(gpu_thread_checker_.CalledOnValidThread());
-
-  // In a forceful shutdown, the decoder thread may be dead already.
-  if (!decoder_thread_.IsRunning()) {
-    delete this;
-    return;
-  }
-
-  // For a graceful shutdown, return assigned buffers and flush before
-  // destructing |this|.
-  // TODO(sandersd): Prevent the decoder from reading buffers before discarding
-  // them.
-  for (int32_t bitstream_id : assigned_bitstream_ids_)
-    client_->NotifyEndOfBitstreamBuffer(bitstream_id);
-  assigned_bitstream_ids_.clear();
-  state_ = STATE_DESTROYING;
-  QueueFlush(TASK_DESTROY);
-}
-
-bool VTVideoDecodeAccelerator::TryToSetupDecodeOnSeparateThread(
-    const base::WeakPtr<Client>& decode_client,
-    const scoped_refptr<base::SingleThreadTaskRunner>& decode_task_runner) {
-  return false;
-}
-
-// static
-media::VideoDecodeAccelerator::SupportedProfiles
-VTVideoDecodeAccelerator::GetSupportedProfiles() {
-  SupportedProfiles profiles;
-  for (const auto& supported_profile : kSupportedProfiles) {
-    SupportedProfile profile;
-    profile.profile = supported_profile;
-    profile.min_resolution.SetSize(16, 16);
-    profile.max_resolution.SetSize(4096, 2160);
-    profiles.push_back(profile);
-  }
-  return profiles;
-}
-
-}  // namespace content