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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_ELEMENTARY_STREAM_DESCRIPTOR_H_
#define EXTENSIONS_RENDERER_API_DISPLAY_SOURCE_WIFI_DISPLAY_WIFI_DISPLAY_ELEMENTARY_STREAM_DESCRIPTOR_H_
#include <stdint.h>
#include <type_traits>
#include "base/memory/scoped_ptr.h"
namespace extensions {
// WiFi Display elementary stream descriptors are used for passing descriptive
// information about elementary streams to WiFiDisplayTransportStreamPacketizer
// which then packetizes that information so that it can be passed to a remote
// sink.
class WiFiDisplayElementaryStreamDescriptor {
public:
enum { kHeaderSize = 2u };
enum DescriptorTag : uint8_t {
DESCRIPTOR_TAG_AVC_VIDEO = 0x28u,
DESCRIPTOR_TAG_AVC_TIMING_AND_HRD = 0x2A,
DESCRIPTOR_TAG_LPCM_AUDIO_STREAM = 0x83u,
};
// Make Google Test treat this class as a container.
using const_iterator = const uint8_t*;
using iterator = const uint8_t*;
WiFiDisplayElementaryStreamDescriptor(
const WiFiDisplayElementaryStreamDescriptor&);
WiFiDisplayElementaryStreamDescriptor(
WiFiDisplayElementaryStreamDescriptor&&);
~WiFiDisplayElementaryStreamDescriptor();
WiFiDisplayElementaryStreamDescriptor& operator=(
WiFiDisplayElementaryStreamDescriptor&&);
const uint8_t* begin() const { return data(); }
const uint8_t* data() const;
bool empty() const { return !data_; }
const uint8_t* end() const { return data() + size(); }
size_t size() const;
DescriptorTag tag() const { return static_cast<DescriptorTag>(data()[0]); }
uint8_t length() const { return data()[1]; }
// AVC (Advanced Video Coding) timing and HRD (Hypothetical Reference
// Decoder) descriptor provides timing and HRD parameters for a video stream.
struct AVCTimingAndHRD {
static WiFiDisplayElementaryStreamDescriptor Create();
};
// AVC (Advanced Video Coding) video descriptor provides basic coding
// parameters for a video stream.
struct AVCVideo {
static WiFiDisplayElementaryStreamDescriptor Create(
uint8_t profile_idc,
bool constraint_set0_flag,
bool constraint_set1_flag,
bool constraint_set2_flag,
uint8_t avc_compatible_flags,
uint8_t level_idc,
bool avc_still_present);
};
class LPCMAudioStream;
protected:
WiFiDisplayElementaryStreamDescriptor(DescriptorTag tag, uint8_t length);
uint8_t* data();
const uint8_t* private_data() const { return data() + kHeaderSize; }
uint8_t* private_data() { return data() + kHeaderSize; }
private:
scoped_ptr<uint8_t[]> data_;
};
// LPCM (Linear pulse-code modulation) audio stream descriptor provides basic
// coding parameters for a private WiFi Display LPCM audio stream.
class WiFiDisplayElementaryStreamDescriptor::LPCMAudioStream
: public WiFiDisplayElementaryStreamDescriptor {
public:
enum { kTag = DESCRIPTOR_TAG_LPCM_AUDIO_STREAM };
enum BitsPerSample : uint8_t { BITS_PER_SAMPLE_16 = 0u };
enum NumberOfChannels : uint8_t {
NUMBER_OF_CHANNELS_DUAL_MONO = 0u,
NUMBER_OF_CHANNELS_STEREO = 1u
};
enum SamplingFrequency : uint8_t {
SAMPLING_FREQUENCY_44_1K = 1u,
SAMPLING_FREQUENCY_48K = 2u
};
static WiFiDisplayElementaryStreamDescriptor Create(
SamplingFrequency sampling_frequency,
BitsPerSample bits_per_sample,
bool emphasis_flag,
NumberOfChannels number_of_channels);
BitsPerSample bits_per_sample() const;
bool emphasis_flag() const;
NumberOfChannels number_of_channels() const;
SamplingFrequency sampling_frequency() const;
};
// Subclasses of WiFiDisplayElementaryStreamDescriptor MUST NOT define new
// member variables but only new non-virtual member functions which parse
// the inherited data. This allows WiFiDisplayElementaryStreamDescriptor
// pointers to be cast to subclass pointers.
static_assert(
std::is_standard_layout<
WiFiDisplayElementaryStreamDescriptor::LPCMAudioStream>::value,
"Forbidden memory layout for an elementary stream descriptor");
} // namespace extensions
#endif // EXTENSIONS_RENDERER_API_DISPLAY_SOURCE_WIFI_DISPLAY_WIFI_DISPLAY_ELEMENTARY_STREAM_DESCRIPTOR_H_
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