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// Copyright 2016 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 EXTENSIONS_RENDERER_API_DISPLAY_SOURCE_WIFI_DISPLAY_WIFI_DISPLAY_MEDIA_ENCODER_H_
#define EXTENSIONS_RENDERER_API_DISPLAY_SOURCE_WIFI_DISPLAY_WIFI_DISPLAY_MEDIA_ENCODER_H_
#include <memory>
#include <string>
#include "base/callback.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/single_thread_task_runner.h"
#include "base/threading/thread_checker.h"
#include "extensions/renderer/api/display_source/wifi_display/wifi_display_elementary_stream_info.h"
namespace extensions {
// This structure represents an encoded media unit such as a video frame or
// a number of audio frames.
struct WiFiDisplayEncodedUnit {
WiFiDisplayEncodedUnit(std::string data,
base::TimeTicks reference_timestamp,
bool key_frame);
WiFiDisplayEncodedUnit(std::string data,
base::TimeTicks reference_timestamp,
base::TimeTicks encode_timestamp,
bool key_frame);
const uint8_t* bytes() const {
return reinterpret_cast<const uint8_t*>(data.data());
}
size_t size() const { return data.size(); }
std::string data;
base::TimeTicks pts; // Presentation timestamp.
base::TimeTicks dts; // Decoder timestamp.
bool key_frame;
DISALLOW_ASSIGN(WiFiDisplayEncodedUnit);
DISALLOW_COPY(WiFiDisplayEncodedUnit);
};
// This interface is a base class for audio and video encoders used by the
// Wi-Fi Display media pipeline.
// Threading: the client code should belong to a single thread.
class WiFiDisplayMediaEncoder
: public base::RefCountedThreadSafe<WiFiDisplayMediaEncoder> {
public:
using EncodedUnitCallback =
base::Callback<void(std::unique_ptr<WiFiDisplayEncodedUnit>)>;
// Creates an elementary stream info describing the stream of encoded units
// which this encoder generates and passes to a callback set using
// |SetCallbacks|. The created elementary stream info should be passed to
// a Wi-Fi Display media packetizer.
virtual WiFiDisplayElementaryStreamInfo CreateElementaryStreamInfo()
const = 0;
// Sets callbacks for the obtained encoder instance:
// |encoded_callback| is invoked to return the next encoded unit
// |error_callback| is invoked to report a fatal encoder error
void SetCallbacks(const EncodedUnitCallback& encoded_callback,
const base::Closure& error_callback);
protected:
friend class base::RefCountedThreadSafe<WiFiDisplayMediaEncoder>;
WiFiDisplayMediaEncoder();
virtual ~WiFiDisplayMediaEncoder();
base::ThreadChecker client_thread_checker_;
EncodedUnitCallback encoded_callback_;
base::Closure error_callback_;
};
} // namespace extensions
#endif // EXTENSIONS_RENDERER_API_DISPLAY_SOURCE_WIFI_DISPLAY_WIFI_DISPLAY_MEDIA_ENCODER_H_
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