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// 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.
#ifndef MEDIA_BASE_MEDIA_LOG_H_
#define MEDIA_BASE_MEDIA_LOG_H_
#include <sstream>
#include <string>
#include "base/logging.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "media/base/media_export.h"
#include "media/base/media_log_event.h"
#include "media/base/pipeline.h"
#include "media/base/pipeline_status.h"
namespace media {
class MEDIA_EXPORT MediaLog : public base::RefCountedThreadSafe<MediaLog> {
public:
enum MediaLogLevel {
MEDIALOG_ERROR,
MEDIALOG_INFO,
MEDIALOG_DEBUG,
};
// Convert various enums to strings.
static std::string MediaLogLevelToString(MediaLogLevel level);
static MediaLogEvent::Type MediaLogLevelToEventType(MediaLogLevel level);
static std::string EventTypeToString(MediaLogEvent::Type type);
static std::string PipelineStatusToString(PipelineStatus status);
static std::string MediaEventToLogString(const MediaLogEvent& event);
MediaLog();
// Add an event to this log. Overriden by inheritors to actually do something
// with it.
virtual void AddEvent(scoped_ptr<MediaLogEvent> event);
// Helper methods to create events and their parameters.
scoped_ptr<MediaLogEvent> CreateEvent(MediaLogEvent::Type type);
scoped_ptr<MediaLogEvent> CreateBooleanEvent(
MediaLogEvent::Type type, const std::string& property, bool value);
scoped_ptr<MediaLogEvent> CreateStringEvent(MediaLogEvent::Type type,
const std::string& property,
const std::string& value);
scoped_ptr<MediaLogEvent> CreateTimeEvent(MediaLogEvent::Type type,
const std::string& property,
base::TimeDelta value);
scoped_ptr<MediaLogEvent> CreateLoadEvent(const std::string& url);
scoped_ptr<MediaLogEvent> CreateSeekEvent(float seconds);
scoped_ptr<MediaLogEvent> CreatePipelineStateChangedEvent(
Pipeline::State state);
scoped_ptr<MediaLogEvent> CreatePipelineErrorEvent(PipelineStatus error);
scoped_ptr<MediaLogEvent> CreateVideoSizeSetEvent(
size_t width, size_t height);
scoped_ptr<MediaLogEvent> CreateBufferedExtentsChangedEvent(
int64 start, int64 current, int64 end);
scoped_ptr<MediaLogEvent> CreateLogEvent(MediaLogLevel level,
const std::string& message);
// Report a property change without an accompanying event.
void SetStringProperty(const std::string& key, const std::string& value);
void SetIntegerProperty(const std::string& key, int value);
void SetDoubleProperty(const std::string& key, double value);
void SetBooleanProperty(const std::string& key, bool value);
void SetTimeProperty(const std::string& key, base::TimeDelta value);
protected:
friend class base::RefCountedThreadSafe<MediaLog>;
virtual ~MediaLog();
private:
// A unique (to this process) id for this MediaLog.
int32 id_;
DISALLOW_COPY_AND_ASSIGN(MediaLog);
};
// Indicates a string should be added to the log.
// First parameter - The log level for the string.
// Second parameter - The string to add to the log.
typedef base::Callback<void(MediaLog::MediaLogLevel, const std::string&)> LogCB;
// Helper class to make it easier to use log_cb like DVLOG().
class LogHelper {
public:
LogHelper(MediaLog::MediaLogLevel level, const LogCB& log_cb);
~LogHelper();
std::ostream& stream() { return stream_; }
private:
MediaLog::MediaLogLevel level_;
LogCB log_cb_;
std::stringstream stream_;
};
// Provides a stringstream to collect a log entry to pass to the provided
// LogCB at the requested level.
#define MEDIA_LOG(level, log_cb) \
LogHelper((MediaLog::MEDIALOG_##level), (log_cb)).stream()
// Logs only while count < max. Increments count for each log. Use LAZY_STREAM
// to avoid wasteful evaluation of subsequent stream arguments.
#define LIMITED_MEDIA_LOG(level, log_cb, count, max) \
LAZY_STREAM(MEDIA_LOG(level, log_cb), (count) < (max) && ((count)++ || true))
} // namespace media
#endif // MEDIA_BASE_MEDIA_LOG_H_
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