Paint first frame faster, don't crash with no frames during EOS.

media/base/video_frame.cc

 // Copyright (c) 2012 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 "media/base/video_frame.h"
 
 #include <algorithm>
 #include <climits>
 
+#include "base/atomic_sequence_num.h"
 #include "base/bind.h"
 #include "base/callback_helpers.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/memory/aligned_memory.h"
 #include "base/strings/string_piece.h"
 #include "base/strings/stringprintf.h"
 #include "build/build_config.h"
 #include "media/base/limits.h"
 #include "media/base/timestamp_constants.h"
 #include "media/base/video_util.h"
 #include "ui/gfx/geometry/point.h"
 
 namespace media {
 
+// Static POD class for generating unique identifiers for each VideoFrame.
+static base::StaticAtomicSequenceNumber g_unique_id_generator;
+
 static bool IsPowerOfTwo(size_t x) {
   return x != 0 && (x & (x - 1)) == 0;
 }
 
 static inline size_t RoundUp(size_t value, size_t alignment) {
   DCHECK(IsPowerOfTwo(alignment));
   return ((value + (alignment - 1)) & ~(alignment - 1));
 }
 
 static inline size_t RoundDown(size_t value, size_t alignment) {
@@ skipping 803 matching lines @@
                        const gfx::Rect& visible_rect,
                        const gfx::Size& natural_size,
                        base::TimeDelta timestamp)
     : format_(format),
       storage_type_(storage_type),
       coded_size_(coded_size),
       visible_rect_(visible_rect),
       natural_size_(natural_size),
       shared_memory_handle_(base::SharedMemory::NULLHandle()),
       shared_memory_offset_(0),
-      timestamp_(timestamp) {
+      timestamp_(timestamp),
+      unique_id_(g_unique_id_generator.GetNext()) {
   DCHECK(IsValidConfig(format_, storage_type, coded_size_, visible_rect_,
                        natural_size_));
   memset(&mailbox_holders_, 0, sizeof(mailbox_holders_));
   memset(&strides_, 0, sizeof(strides_));
   memset(&data_, 0, sizeof(data_));
 }
 
 VideoFrame::~VideoFrame() {
   if (!mailbox_holders_release_cb_.is_null()) {
     gpu::SyncToken release_sync_token;
@@ skipping 252 matching lines @@
   if (zero_initialize_memory)
     memset(data, 0, data_size);
 
   for (size_t plane = 0; plane < NumPlanes(format_); ++plane)
     data_[plane] = data + offset[plane];
 
   AddDestructionObserver(base::Bind(&base::AlignedFree, data));
 }
 
 }  // namespace media