media/blink/buffered_data_source_host_impl.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 "media/blink/buffered_data_source_host_impl.h"
   6
   7 namespace media {
   8
   9 BufferedDataSourceHostImpl::BufferedDataSourceHostImpl()
  10     : total_bytes_(0),
  11       did_loading_progress_(false) { }
  12
  13 BufferedDataSourceHostImpl::~BufferedDataSourceHostImpl() { }
  14
  15 void BufferedDataSourceHostImpl::SetTotalBytes(int64 total_bytes) {
  16   total_bytes_ = total_bytes;
  17 }
  18
  19 void BufferedDataSourceHostImpl::AddBufferedByteRange(int64 start, int64 end) {
  20   buffered_byte_ranges_.Add(start, end);
  21   did_loading_progress_ = true;
  22 }
  23
  24 static base::TimeDelta TimeForByteOffset(
  25     int64 byte_offset, int64 total_bytes, base::TimeDelta duration) {
  26   double position = static_cast<double>(byte_offset) / total_bytes;
  27   // Snap to the beginning/end where the approximation can look especially bad.
  28   if (position < 0.01)
  29     return base::TimeDelta();
  30   if (position > 0.99)
  31     return duration;
  32   return base::TimeDelta::FromMilliseconds(
  33       static_cast<int64>(position * duration.InMilliseconds()));
  34 }
  35
  36 void BufferedDataSourceHostImpl::AddBufferedTimeRanges(
  37     Ranges<base::TimeDelta>* buffered_time_ranges,
  38     base::TimeDelta media_duration) const {
  39   DCHECK(media_duration != kNoTimestamp());
  40   DCHECK(media_duration != kInfiniteDuration());
  41   if (total_bytes_ && buffered_byte_ranges_.size()) {
  42     for (size_t i = 0; i < buffered_byte_ranges_.size(); ++i) {
  43       int64 start = buffered_byte_ranges_.start(i);
  44       int64 end = buffered_byte_ranges_.end(i);
  45       buffered_time_ranges->Add(
  46           TimeForByteOffset(start, total_bytes_, media_duration),
  47           TimeForByteOffset(end, total_bytes_, media_duration));
  48     }
  49   }
  50 }
  51
  52 bool BufferedDataSourceHostImpl::DidLoadingProgress() {
  53   bool ret = did_loading_progress_;
  54   did_loading_progress_ = false;
  55   return ret;
  56 }
  57
  58 }  // namespace media