[Media] Record time it takes to start rendering audio and video

media/renderers/audio_renderer_impl.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/renderers/audio_renderer_impl.h"
 
 #include <math.h>
 #include <stddef.h>
 #include <algorithm>
 #include <utility>
@@ skipping 40 matching lines @@
       last_decoded_channel_layout_(CHANNEL_LAYOUT_NONE),
       playback_rate_(0.0),
       state_(kUninitialized),
       buffering_state_(BUFFERING_HAVE_NOTHING),
       rendering_(false),
       sink_playing_(false),
       pending_read_(false),
       received_end_of_stream_(false),
       rendered_end_of_stream_(false),
       is_suspending_(false),
+      rendered_first_frame_(false),
       weak_factory_(this) {
   audio_buffer_stream_->set_config_change_observer(base::Bind(
       &AudioRendererImpl::OnConfigChange, weak_factory_.GetWeakPtr()));
 
   // Tests may not have a power monitor.
   base::PowerMonitor* monitor = base::PowerMonitor::Get();
   if (!monitor)
     return;
 
   // PowerObserver's must be added and removed from the same thread, but we
@@ skipping 95 matching lines @@
   DCHECK(task_runner_->BelongsToCurrentThread());
 
   base::AutoLock auto_lock(lock_);
   DCHECK(!rendering_);
   DCHECK_EQ(state_, kFlushed);
 
   start_timestamp_ = time;
   ended_timestamp_ = kInfiniteDuration;
   last_render_time_ = stop_rendering_time_ = base::TimeTicks();
   first_packet_timestamp_ = kNoTimestamp;
+  rendered_first_frame_ = false;
   audio_clock_.reset(new AudioClock(time, audio_parameters_.sample_rate()));
 }
 
 base::TimeDelta AudioRendererImpl::CurrentMediaTime() {
   base::AutoLock auto_lock(lock_);
 
   // Return the current time based on the known extents of the rendered audio
   // data plus an estimate based on the last time those values were calculated.
   base::TimeDelta current_media_time = audio_clock_->front_timestamp();
   if (!last_render_time_.is_null()) {
@@ skipping 574 matching lines @@
                               AudioBus* audio_bus) {
   const int frames_requested = audio_bus->frames();
   DVLOG(4) << __func__ << " delay:" << delay
            << " prior_frames_skipped:" << prior_frames_skipped
            << " frames_requested:" << frames_requested;
 
   int frames_written = 0;
   {
     base::AutoLock auto_lock(lock_);
     last_render_time_ = tick_clock_->NowTicks();
+    if (!rendered_first_frame_) {
+      rendered_first_frame_ = true;
+      client_->OnFirstFrameRender();
+    }
 
     int64_t frames_delayed = AudioTimestampHelper::TimeToFrames(
         delay, audio_parameters_.sample_rate());
 
     if (!stop_rendering_time_.is_null()) {
       audio_clock_->CompensateForSuspendedWrites(
           last_render_time_ - stop_rendering_time_, frames_delayed);
       stop_rendering_time_ = base::TimeTicks();
     }
 
@@ skipping 206 matching lines @@
   // All channels with a zero mix are muted and can be ignored.
   std::vector<bool> channel_mask(audio_parameters_.channels(), false);
   for (size_t ch = 0; ch < matrix.size(); ++ch) {
     channel_mask[ch] = std::any_of(matrix[ch].begin(), matrix[ch].end(),
                                    [](float mix) { return !!mix; });
   }
   algorithm_->SetChannelMask(std::move(channel_mask));
 }
 
 }  // namespace media