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JuceLibraryCode/modules/juce_audio_basics/audio_play_head/juce_AudioPlayHead.h
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| /* | ||
| ============================================================================== | ||
| This file is part of the JUCE library. | ||
| Copyright (c) 2017 - ROLI Ltd. | ||
| JUCE is an open source library subject to commercial or open-source | ||
| licensing. | ||
| The code included in this file is provided under the terms of the ISC license | ||
| http://www.isc.org/downloads/software-support-policy/isc-license. Permission | ||
| To use, copy, modify, and/or distribute this software for any purpose with or | ||
| without fee is hereby granted provided that the above copyright notice and | ||
| this permission notice appear in all copies. | ||
| JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER | ||
| EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE | ||
| DISCLAIMED. | ||
| ============================================================================== | ||
| */ | ||
|
|
||
| namespace juce | ||
| { | ||
|
|
||
| //============================================================================== | ||
| /** | ||
| A subclass of AudioPlayHead can supply information about the position and | ||
| status of a moving play head during audio playback. | ||
| One of these can be supplied to an AudioProcessor object so that it can find | ||
| out about the position of the audio that it is rendering. | ||
| @see AudioProcessor::setPlayHead, AudioProcessor::getPlayHead | ||
| @tags{Audio} | ||
| */ | ||
| class JUCE_API AudioPlayHead | ||
| { | ||
| protected: | ||
| //============================================================================== | ||
| AudioPlayHead() = default; | ||
|
|
||
| public: | ||
| virtual ~AudioPlayHead() = default; | ||
|
|
||
| //============================================================================== | ||
| /** Frame rate types. */ | ||
| enum FrameRateType | ||
| { | ||
| fps23976 = 0, | ||
| fps24 = 1, | ||
| fps25 = 2, | ||
| fps2997 = 3, | ||
| fps30 = 4, | ||
| fps2997drop = 5, | ||
| fps30drop = 6, | ||
| fps60 = 7, | ||
| fps60drop = 8, | ||
| fpsUnknown = 99 | ||
| }; | ||
|
|
||
| //============================================================================== | ||
| /** This structure is filled-in by the AudioPlayHead::getCurrentPosition() method. | ||
| */ | ||
| struct JUCE_API CurrentPositionInfo | ||
| { | ||
| /** The tempo in BPM */ | ||
| double bpm; | ||
|
|
||
| /** Time signature numerator, e.g. the 3 of a 3/4 time sig */ | ||
| int timeSigNumerator; | ||
| /** Time signature denominator, e.g. the 4 of a 3/4 time sig */ | ||
| int timeSigDenominator; | ||
|
|
||
| /** The current play position, in samples from the start of the timeline. */ | ||
| int64 timeInSamples; | ||
| /** The current play position, in seconds from the start of the timeline. */ | ||
| double timeInSeconds; | ||
|
|
||
| /** For timecode, the position of the start of the timeline, in seconds from 00:00:00:00. */ | ||
| double editOriginTime; | ||
|
|
||
| /** The current play position, in units of quarter-notes. */ | ||
| double ppqPosition; | ||
|
|
||
| /** The position of the start of the last bar, in units of quarter-notes. | ||
| This is the time from the start of the timeline to the start of the current | ||
| bar, in ppq units. | ||
| Note - this value may be unavailable on some hosts, e.g. Pro-Tools. If | ||
| it's not available, the value will be 0. | ||
| */ | ||
| double ppqPositionOfLastBarStart; | ||
|
|
||
| /** The video frame rate, if applicable. */ | ||
| FrameRateType frameRate; | ||
|
|
||
| /** True if the transport is currently playing. */ | ||
| bool isPlaying; | ||
|
|
||
| /** True if the transport is currently recording. | ||
| (When isRecording is true, then isPlaying will also be true). | ||
| */ | ||
| bool isRecording; | ||
|
|
||
| /** The current cycle start position in units of quarter-notes. | ||
| Note that not all hosts or plugin formats may provide this value. | ||
| @see isLooping | ||
| */ | ||
| double ppqLoopStart; | ||
|
|
||
| /** The current cycle end position in units of quarter-notes. | ||
| Note that not all hosts or plugin formats may provide this value. | ||
| @see isLooping | ||
| */ | ||
| double ppqLoopEnd; | ||
|
|
||
| /** True if the transport is currently looping. */ | ||
| bool isLooping; | ||
|
|
||
| //============================================================================== | ||
| bool operator== (const CurrentPositionInfo& other) const noexcept; | ||
| bool operator!= (const CurrentPositionInfo& other) const noexcept; | ||
|
|
||
| void resetToDefault(); | ||
| }; | ||
|
|
||
| //============================================================================== | ||
| /** Fills-in the given structure with details about the transport's | ||
| position at the start of the current processing block. If this method returns | ||
| false then the current play head position is not available and the given | ||
| structure will be undefined. | ||
| You can ONLY call this from your processBlock() method! Calling it at other | ||
| times will produce undefined behaviour, as the host may not have any context | ||
| in which a time would make sense, and some hosts will almost certainly have | ||
| multithreading issues if it's not called on the audio thread. | ||
| */ | ||
| virtual bool getCurrentPosition (CurrentPositionInfo& result) = 0; | ||
|
|
||
| /** Returns true if this object can control the transport. */ | ||
| virtual bool canControlTransport() { return false; } | ||
|
|
||
| /** Starts or stops the audio. */ | ||
| virtual void transportPlay (bool shouldStartPlaying) { ignoreUnused (shouldStartPlaying); } | ||
|
|
||
| /** Starts or stops recording the audio. */ | ||
| virtual void transportRecord (bool shouldStartRecording) { ignoreUnused (shouldStartRecording); } | ||
|
|
||
| /** Rewinds the audio. */ | ||
| virtual void transportRewind() {} | ||
| }; | ||
|
|
||
| } // namespace juce | ||
| /* | ||
| ============================================================================== | ||
| This file is part of the JUCE library. | ||
| Copyright (c) 2017 - ROLI Ltd. | ||
| JUCE is an open source library subject to commercial or open-source | ||
| licensing. | ||
| The code included in this file is provided under the terms of the ISC license | ||
| http://www.isc.org/downloads/software-support-policy/isc-license. Permission | ||
| To use, copy, modify, and/or distribute this software for any purpose with or | ||
| without fee is hereby granted provided that the above copyright notice and | ||
| this permission notice appear in all copies. | ||
| JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER | ||
| EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE | ||
| DISCLAIMED. | ||
| ============================================================================== | ||
| */ | ||
|
|
||
| namespace juce | ||
| { | ||
|
|
||
| //============================================================================== | ||
| /** | ||
| A subclass of AudioPlayHead can supply information about the position and | ||
| status of a moving play head during audio playback. | ||
| One of these can be supplied to an AudioProcessor object so that it can find | ||
| out about the position of the audio that it is rendering. | ||
| @see AudioProcessor::setPlayHead, AudioProcessor::getPlayHead | ||
| @tags{Audio} | ||
| */ | ||
| class JUCE_API AudioPlayHead | ||
| { | ||
| protected: | ||
| //============================================================================== | ||
| AudioPlayHead() = default; | ||
|
|
||
| public: | ||
| virtual ~AudioPlayHead() = default; | ||
|
|
||
| //============================================================================== | ||
| /** Frame rate types. */ | ||
| enum FrameRateType | ||
| { | ||
| fps23976 = 0, | ||
| fps24 = 1, | ||
| fps25 = 2, | ||
| fps2997 = 3, | ||
| fps30 = 4, | ||
| fps2997drop = 5, | ||
| fps30drop = 6, | ||
| fps60 = 7, | ||
| fps60drop = 8, | ||
| fpsUnknown = 99 | ||
| }; | ||
|
|
||
| //============================================================================== | ||
| /** This structure is filled-in by the AudioPlayHead::getCurrentPosition() method. | ||
| */ | ||
| struct JUCE_API CurrentPositionInfo | ||
| { | ||
| /** The tempo in BPM */ | ||
| double bpm; | ||
|
|
||
| /** Time signature numerator, e.g. the 3 of a 3/4 time sig */ | ||
| int timeSigNumerator; | ||
| /** Time signature denominator, e.g. the 4 of a 3/4 time sig */ | ||
| int timeSigDenominator; | ||
|
|
||
| /** The current play position, in samples from the start of the timeline. */ | ||
| int64 timeInSamples; | ||
| /** The current play position, in seconds from the start of the timeline. */ | ||
| double timeInSeconds; | ||
|
|
||
| /** For timecode, the position of the start of the timeline, in seconds from 00:00:00:00. */ | ||
| double editOriginTime; | ||
|
|
||
| /** The current play position, in units of quarter-notes. */ | ||
| double ppqPosition; | ||
|
|
||
| /** The position of the start of the last bar, in units of quarter-notes. | ||
| This is the time from the start of the timeline to the start of the current | ||
| bar, in ppq units. | ||
| Note - this value may be unavailable on some hosts, e.g. Pro-Tools. If | ||
| it's not available, the value will be 0. | ||
| */ | ||
| double ppqPositionOfLastBarStart; | ||
|
|
||
| /** The video frame rate, if applicable. */ | ||
| FrameRateType frameRate; | ||
|
|
||
| /** True if the transport is currently playing. */ | ||
| bool isPlaying; | ||
|
|
||
| /** True if the transport is currently recording. | ||
| (When isRecording is true, then isPlaying will also be true). | ||
| */ | ||
| bool isRecording; | ||
|
|
||
| /** The current cycle start position in units of quarter-notes. | ||
| Note that not all hosts or plugin formats may provide this value. | ||
| @see isLooping | ||
| */ | ||
| double ppqLoopStart; | ||
|
|
||
| /** The current cycle end position in units of quarter-notes. | ||
| Note that not all hosts or plugin formats may provide this value. | ||
| @see isLooping | ||
| */ | ||
| double ppqLoopEnd; | ||
|
|
||
| /** True if the transport is currently looping. */ | ||
| bool isLooping; | ||
|
|
||
| //============================================================================== | ||
| bool operator== (const CurrentPositionInfo& other) const noexcept; | ||
| bool operator!= (const CurrentPositionInfo& other) const noexcept; | ||
|
|
||
| void resetToDefault(); | ||
| }; | ||
|
|
||
| //============================================================================== | ||
| /** Fills-in the given structure with details about the transport's | ||
| position at the start of the current processing block. If this method returns | ||
| false then the current play head position is not available and the given | ||
| structure will be undefined. | ||
| You can ONLY call this from your processBlock() method! Calling it at other | ||
| times will produce undefined behaviour, as the host may not have any context | ||
| in which a time would make sense, and some hosts will almost certainly have | ||
| multithreading issues if it's not called on the audio thread. | ||
| */ | ||
| virtual bool getCurrentPosition (CurrentPositionInfo& result) = 0; | ||
|
|
||
| /** Returns true if this object can control the transport. */ | ||
| virtual bool canControlTransport() { return false; } | ||
|
|
||
| /** Starts or stops the audio. */ | ||
| virtual void transportPlay (bool shouldStartPlaying) { ignoreUnused (shouldStartPlaying); } | ||
|
|
||
| /** Starts or stops recording the audio. */ | ||
| virtual void transportRecord (bool shouldStartRecording) { ignoreUnused (shouldStartRecording); } | ||
|
|
||
| /** Rewinds the audio. */ | ||
| virtual void transportRewind() {} | ||
| }; | ||
|
|
||
| } // namespace juce |
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