src/chromecast/media/cma/base/buffering_state.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "chromecast/media/cma/base/buffering_state.h"
   6
   7 #include <sstream>
   8
   9 #include "base/logging.h"
  10 #include "media/base/buffers.h"
  11
  12 namespace chromecast {
  13 namespace media {
  14
  15 BufferingConfig::BufferingConfig(
  16     base::TimeDelta low_level_threshold,
  17     base::TimeDelta high_level_threshold)
  18     : low_level_threshold_(low_level_threshold),
  19       high_level_threshold_(high_level_threshold) {
  20 }
  21
  22 BufferingConfig::~BufferingConfig() {
  23 }
  24
  25
  26 BufferingState::BufferingState(
  27     const scoped_refptr<BufferingConfig>& config,
  28     const base::Closure& state_changed_cb,
  29     const HighLevelBufferCB& high_level_buffer_cb)
  30     : config_(config),
  31       state_changed_cb_(state_changed_cb),
  32       high_level_buffer_cb_(high_level_buffer_cb),
  33       state_(kLowLevel),
  34       media_time_(::media::kNoTimestamp()),
  35       max_rendering_time_(::media::kNoTimestamp()),
  36       buffered_time_(::media::kNoTimestamp()) {
  37 }
  38
  39 BufferingState::~BufferingState() {
  40 }
  41
  42 void BufferingState::OnConfigChanged() {
  43   state_ = GetBufferLevelState();
  44 }
  45
  46 void BufferingState::SetMediaTime(base::TimeDelta media_time) {
  47   media_time_ = media_time;
  48   switch (state_) {
  49     case kLowLevel:
  50     case kMediumLevel:
  51     case kHighLevel:
  52       UpdateState(GetBufferLevelState());
  53       break;
  54     case kEosReached:
  55       break;
  56   }
  57 }
  58
  59 void BufferingState::SetMaxRenderingTime(base::TimeDelta max_rendering_time) {
  60   max_rendering_time_ = max_rendering_time;
  61 }
  62
  63 base::TimeDelta BufferingState::GetMaxRenderingTime() const {
  64   return max_rendering_time_;
  65 }
  66
  67 void BufferingState::SetBufferedTime(base::TimeDelta buffered_time) {
  68   buffered_time_ = buffered_time;
  69   switch (state_) {
  70     case kLowLevel:
  71     case kMediumLevel:
  72     case kHighLevel:
  73       UpdateState(GetBufferLevelState());
  74       break;
  75     case kEosReached:
  76       break;
  77   }
  78 }
  79
  80 void BufferingState::NotifyEos() {
  81   UpdateState(kEosReached);
  82 }
  83
  84 void BufferingState::NotifyMaxCapacity(base::TimeDelta buffered_time) {
  85   if (media_time_ == ::media::kNoTimestamp() ||
  86       buffered_time == ::media::kNoTimestamp()) {
  87     LOG(WARNING) << "Max capacity with no timestamp";
  88     return;
  89   }
  90   base::TimeDelta buffer_duration = buffered_time - media_time_;
  91   if (buffer_duration < config_->high_level())
  92     high_level_buffer_cb_.Run(buffer_duration);
  93 }
  94
  95 std::string BufferingState::ToString() const {
  96   std::ostringstream s;
  97   s << "state=" << state_
  98     << " media_time_ms=" << media_time_.InMilliseconds()
  99     << " buffered_time_ms=" << buffered_time_.InMilliseconds()
 100     << " low_level_ms=" << config_->low_level().InMilliseconds()
 101     << " high_level_ms=" << config_->high_level().InMilliseconds();
 102   return s.str();
 103 }
 104
 105 BufferingState::State BufferingState::GetBufferLevelState() const {
 106   if (media_time_ == ::media::kNoTimestamp() ||
 107       buffered_time_ == ::media::kNoTimestamp()) {
 108     return kLowLevel;
 109   }
 110
 111   base::TimeDelta buffer_duration = buffered_time_ - media_time_;
 112   if (buffer_duration < config_->low_level())
 113     return kLowLevel;
 114   if (buffer_duration >= config_->high_level())
 115     return kHighLevel;
 116   return kMediumLevel;
 117 }
 118
 119 void BufferingState::UpdateState(State new_state) {
 120   if (new_state == state_)
 121     return;
 122
 123   state_ = new_state;
 124   if (!state_changed_cb_.is_null())
 125     state_changed_cb_.Run();
 126 }
 127
 128 }  // namespace media
 129 }  // namespace chromecast