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// 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 <stdint.h>
#include "base/callback.h"
#include "base/containers/circular_deque.h"
#include "base/gtest_prod_util.h"
#include "base/macros.h"
#include "base/time/tick_clock.h"
#include "base/time/time.h"
#include "media/base/ranges.h"
#include "media/blink/interval_map.h"
#include "media/blink/media_blink_export.h"
namespace media {
// Interface for testing purposes.
class MEDIA_BLINK_EXPORT BufferedDataSourceHost {
// Notify the host of the total size of the media file.
virtual void SetTotalBytes(int64_t total_bytes) = 0;
// Notify the host that byte range [start,end] has been buffered.
// TODO(fischman): remove this method when demuxing is push-based instead of
// pull-based.
virtual void AddBufferedByteRange(int64_t start, int64_t end) = 0;
virtual ~BufferedDataSourceHost() {}
// Provides an implementation of BufferedDataSourceHost that translates the
// buffered byte ranges into estimated time ranges.
class MEDIA_BLINK_EXPORT BufferedDataSourceHostImpl
: public BufferedDataSourceHost {
BufferedDataSourceHostImpl(base::Closure progress_cb,
const base::TickClock* tick_clock);
~BufferedDataSourceHostImpl() override;
// BufferedDataSourceHost implementation.
void SetTotalBytes(int64_t total_bytes) override;
void AddBufferedByteRange(int64_t start, int64_t end) override;
// Translate the byte ranges to time ranges and append them to the list.
// TODO(sandersd): This is a confusing name, find something better.
void AddBufferedTimeRanges(
Ranges<base::TimeDelta>* buffered_time_ranges,
base::TimeDelta media_duration) const;
bool DidLoadingProgress();
// Returns true if we have enough buffered bytes to play from now
// until the end of media
bool CanPlayThrough(base::TimeDelta current_position,
base::TimeDelta media_duration,
double playback_rate) const;
// Caller must make sure |tick_clock| is valid for lifetime of this object.
void SetTickClockForTest(const base::TickClock* tick_clock);
// Returns number of bytes not yet loaded in the given interval.
int64_t UnloadedBytesInInterval(const Interval<int64_t>& interval) const;
// Returns an estimate of the download rate.
// Returns 0.0 if an estimate cannot be made.
double DownloadRate() const;
// Total size of the data source.
int64_t total_bytes_;
// List of buffered byte ranges for estimating buffered time.
// The InterValMap value is 1 for bytes that are buffered, 0 otherwise.
IntervalMap<int64_t, int> buffered_byte_ranges_;
// True when AddBufferedByteRange() has been called more recently than
// DidLoadingProgress().
bool did_loading_progress_;
// Contains how much we had downloaded at a given time.
// Pruned to contain roughly the last 10 seconds of data.
base::circular_deque<std::pair<base::TimeTicks, uint64_t>> download_history_;
base::Closure progress_cb_;
const base::TickClock* tick_clock_;
FRIEND_TEST_ALL_PREFIXES(BufferedDataSourceHostImplTest, CanPlayThrough);
} // namespace media