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// Copyright 2015 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_CAST_CONSTANTS_H_
#define MEDIA_CAST_CONSTANTS_H_
////////////////////////////////////////////////////////////////////////////////
// NOTE: This file should only contain constants that are reasonably globally
// used (i.e., by many modules, and in all or nearly all subdirs). Do NOT add
// non-POD constants, functions, interfaces, or any logic to this module.
////////////////////////////////////////////////////////////////////////////////
#include <stdint.h>
namespace media {
namespace cast {
// The first frame ID in an RTP stream.
enum : uint32_t { kFirstFrameId = UINT32_C(0) };
// Integer constants set either by the Cast Streaming Protocol Spec or due to
// design limitations.
enum Specifications {
// Target number of milliseconds between the sending of RTCP reports. Both
// senders and receivers regularly send RTCP reports to their peer.
kRtcpReportIntervalMs = 500,
// This is an important system-wide constant. This limits how much history
// the implementation must retain in order to process the acknowledgements of
// past frames.
//
// This value is carefully choosen such that it fits in the 8-bits range for
// frame IDs. It is also less than half of the full 8-bits range such that
// logic can handle wrap around and compare two frame IDs meaningfully.
kMaxUnackedFrames = 120,
// The spec declares RTP timestamps must always have a timebase of 90000 ticks
// per second for video.
kVideoFrequency = 90000,
};
// Success/in-progress/failure status codes reported to clients to indicate
// readiness state.
enum OperationalStatus {
// Client should not send frames yet (sender), or should not expect to receive
// frames yet (receiver).
STATUS_UNINITIALIZED,
// Client may now send or receive frames.
STATUS_INITIALIZED,
// Codec is being re-initialized. Client may continue sending frames, but
// some may be ignored/dropped until a transition back to STATUS_INITIALIZED.
STATUS_CODEC_REINIT_PENDING,
// Session has halted due to invalid configuration.
STATUS_INVALID_CONFIGURATION,
// Session has halted due to an unsupported codec.
STATUS_UNSUPPORTED_CODEC,
// Session has halted due to a codec initialization failure. Note that this
// can be reported after STATUS_INITIALIZED/STATUS_CODEC_REINIT_PENDING if the
// codec was re-initialized during the session.
STATUS_CODEC_INIT_FAILED,
// Session has halted due to a codec runtime failure.
STATUS_CODEC_RUNTIME_ERROR,
};
} // namespace cast
} // namespace media
#endif // MEDIA_CAST_CONSTANTS_H_
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