/*
`
`++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
`+++++++++++++
`Copyright (c) 2001 BeComm Corporation
`Filename:
` sosisampleclock.h
`Group Name:
` Sample Clock Interface
`Group Overview:
` A "Sample Clock" provides a mechanism for synchronizing
` two streams of multimedia.
` Each stream is characterized
` by a frequency and divisor to get the
` result in samples per millisecond.
` For instance a 44100Hz
` audio stream has a frequency of 44100Hz and a divisor
` of 1000 (44100 / 1000 = 4.41 samples per millisecond).
` A 25 frame-per-second video stream has a frequency of
` 25/1000 frames per millisecond.
` A sample clock contains the frequency and divisor for
` the stream, plus an instantaneous position mark,
` consisting of a wall-clock time (in milliseconds) and
` a sample position (in samples).
` Given this set of values we can project back to get the time
`at
` which sample 0 would have been played - the "epoch" for this
`stream.
` By comparing two epochs, we can determine the time shift
` required to bring them into synchronization.
` The epoch for a given stream may drift with time for several
` reasons; audio hardware playout rates do not always exactly
` match the system clock; in some cases the drift varies
`depending on
` the level of interrupt activity on the system. If a stream
`is
` paused due to system contention or user intervention the
`epoch
` will change.
`
` Typically one clock is identified as the master clock, and
` all other clocks attempt to match the master. For instance
`
`1
`
`
`Page 1 of 6
`
`SONOS EXHIBIT 1025
`IPR OF U.S. Pat. No. 8,942,252
`
`
`
`++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
`+++++++++++++
`Copyright (c) 2001 BeComm Corporation
`Filename:
` sosisampleclock.h
`Group Name:
` Sample Clock Interface
`Group Overview:
` A "Sample Clock" provides a mechanism for synchronizing
` two streams of multimedia.
` Each stream is characterized
` by a frequency and divisor to get the
` result in samples per millisecond.
` For instance a 44100Hz
` audio stream has a frequency of 44100Hz and a divisor
` of 1000 (44100 / 1000 = 4.41 samples per millisecond).
` A 25 frame-per-second video stream has a frequency of
` 25/1000 frames per millisecond.
` A sample clock contains the frequency and divisor for
` the stream, plus an instantaneous position mark,
` consisting of a wall-clock time (in milliseconds) and
` a sample position (in samples).
` Given this set of values we can project back to get the time
`at
` which sample 0 would have been played - the "epoch" for this
`stream.
` By comparing two epochs, we can determine the time shift
` required to bring them into synchronization.
` The epoch for a given stream may drift with time for several
` reasons; audio hardware playout rates do not always exactly
` match the system clock; in some cases the drift varies
`depending on
` the level of interrupt activity on the system. If a stream
`is
` paused due to system contention or user intervention the
`epoch
` will change.
`
` Typically one clock is identified as the master clock, and
` all other clocks attempt to match the master. For instance
`
`1
`
`
`Page 1 of 6
`
`SONOS EXHIBIT 1025
`IPR OF U.S. Pat. No. 8,942,252
`
`
`
` when playing audio and video, the audio clock is typically
`the
` master clock (because audio playout rate is usually regulated
` by an external DSP clock, and users are more perceptive to
`changes
` in audio delivery rate).
` Periodically the playout position for the audio stream
` is copied into the master sample clock. The video stream
`then
` uses the difference between it's own sample clock and the
`audio-derived
` master clock to determine the frame delivery time for each
`frame.
` Overflow errors must be considered when dealing with samples.
` A 32-bit millisecond counter will wrap after 2^32
`milliseconds
` which is approximately 50 days. A 32-bit sample counter at
`44100Hz
` will wrap around in 2^32/44100 seconds which is approximately
` 27 hours. If any addition or multiplication is performed on
`sample
` values, overflow errors may occur much earlier.
`Owner:
` Guy Carpenter (guyc) 21-Aug-2001
`-----------------------------------------------------------------
`------------*/
`/* cvsid: $Id: sosisampleclock.h,v 1.5 2001/09/13 20:50:24 guyc
`Exp $ */
`#ifndef _SOSISAMPLECLOCK_H_
`#define _SOSISAMPLECLOCK_H_
`#include <sosstrings.h>
`/*++
`Macro Description:
` Defines the global identifier for the SampleClock interface.
`--*/
`#define SOS_ISAMPLECLOCK_ID "sampleclock"
`typedef struct _SOS_ISAMPLECLOCK SOS_ISAMPLECLOCK;
`/*++
`Prototype Name:
`
`2
`
`
`Page 2 of 6
`
`SONOS EXHIBIT 1025
`IPR OF U.S. Pat. No. 8,942,252
`
`
`
` SOS_ISAMPLECLOCK_FREQUENCYSET
`Prototype Description:
` Set the sample frequency of the sample clock. The
` frequency is expressed as a ratio of two 32-bit unsigned
` integers.
`Parameters:
` SOS_ISAMPLECLOCK * Interface - [in]
` Interface to object.
` SOS_UINT32 Frequency - [in]
` Frequency numerator.
` SOS_UINT32 Divisor - [in]
` Frequency divisor. May NOT be zero.
`Return Value:
` SOS_STATUS -
` SOS_Success for successful completion.
`
` SOS_ErrorParameter if interface is invalid or the divisor
`is zero.
`--*/
`typedef
`SOS_STATUS
`(*SOS_ISAMPLECLOCK_FREQUENCYSET)(
` SOS_ISAMPLECLOCK * Interface,
` SOS_UINT32 Frequency,
` SOS_UINT32 Divisor
`);
`/*++
`Prototype Name:
` SOS_ISAMPLECLOCK_FREQUENCYGET
`Prototype Description:
` Returns the current frequency ratio. If no call
` has been made to FrequencySet for this object, the
` values will be zero.
` Note that the sampleclock implementation may return
` different values for Frequency and Divisor than those
` originally set - the ratio should remain the same.
`Parameters:
`
`3
`
`
`Page 3 of 6
`
`SONOS EXHIBIT 1025
`IPR OF U.S. Pat. No. 8,942,252
`
`
`
` SOS_ISAMPLECLOCK * Interface - [in]
` Interface to object to be queried.
` SOS_UINT32 * Frequency - [out]
` If not null, current frequency numerator will be
` stored at Frequency.
` SOS_UINT32 * Divisor - [out]
` If not null, current frequency divisor will be
` stored at Divisor.
`Return Value:
` SOS_STATUS -
` SOS_Success for successful completion.
` SOS_ErrorParameter if the interface is invalid.
`--*/
`typedef
`SOS_STATUS
`(*SOS_ISAMPLECLOCK_FREQUENCYGET)(
` SOS_ISAMPLECLOCK * Interface,
` SOS_UINT32 * Frequency,
` SOS_UINT32 * Divisor
`);
`/*++
`Prototype Name:
` SOS_ISAMPLECLOCK_UPDATE
`Prototype Description:
` Updates the sample position for this clock. The stream
` position is expressed in the units defined by the call
` to FrequencySet - typically samples for audio, or frames
` for video.
`Parameters:
` SOS_ISAMPLECLOCK * Interface - [in]
` Interface to object being updated.
` SOS_CLOCK_TICK Time - [in]
` Clock time at which this sample was/will be delivered.
` SOS_UINT32 Sample - [in]
` Stream position.
`Return Value:
`
`4
`
`
`Page 4 of 6
`
`SONOS EXHIBIT 1025
`IPR OF U.S. Pat. No. 8,942,252
`
`
`
` SOS_STATUS -
` SOS_Success for successful completion.
` SOS_ErrorParameter if interfaces is not valid.
`--*/
`typedef
`SOS_STATUS
`(*SOS_ISAMPLECLOCK_UPDATE)(
` SOS_ISAMPLECLOCK * Interface,
` SOS_CLOCK_TICK Time,
` SOS_UINT32 Sample
`);
`/*++
`Prototype Name:
` SOS_ISAMPLECLOCK_EPOCHGET
`Prototype Description:
` Gets the nominal epoch (or stream-start time) for this
` clock. The epoch is the time at which frame zero would
` have been delivered, computed from the last update
` time and frequency settings. This value does not reflect
` the time frame/sample 0 was actually delivered, but rather
` the projected time based on the current frame position.
`Parameters:
` SOS_ISAMPLECLOCK * Interface - [in]
` Interface to clock object.
` SOS_CLOCK_TICK * Epoch - [out]
` Location to store the computed epoch.
`Return Value:
` SOS_STATUS -
` SOS_Success for successful completion.
` SOS_ErrorParameter if the interface is invalid,
` or if Epoch is NULL, or if the frequency has not
` been set.
`--*/
`typedef
`SOS_STATUS
`(*SOS_ISAMPLECLOCK_EPOCHGET)(
` SOS_ISAMPLECLOCK * Interface,
` SOS_CLOCK_TICK * Epoch
`
`5
`
`
`Page 5 of 6
`
`SONOS EXHIBIT 1025
`IPR OF U.S. Pat. No. 8,942,252
`
`
`
`);
`
`/*++
` Struct Description:
` Implementors of the sampleclock interface should use the
`following
` structure to register the sampleclock interface for their
`class.
`--*/
`struct _SOS_ISAMPLECLOCK {
` SOS_INTERFACE_DECL;
` SOS_ISAMPLECLOCK_FREQUENCYSET FrequencySet;
` SOS_ISAMPLECLOCK_FREQUENCYGET FrequencyGet;
` SOS_ISAMPLECLOCK_UPDATE Update;
` SOS_ISAMPLECLOCK_EPOCHGET EpochGet;
`};
`
`#endif /* _SOSISAMPLECLOCK_H_ */
`
`6
`
`
`Page 6 of 6
`
`SONOS EXHIBIT 1025
`IPR OF U.S. Pat. No. 8,942,252
`
`
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