Aegisub/src/audio_controller.h

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// Copyright (c) 2009-2010, Niels Martin Hansen
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
// * Neither the name of the Aegisub Group nor the names of its contributors
// may be used to endorse or promote products derived from this software
// without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//
// Aegisub Project http://www.aegisub.org/
/// @file audio_controller.h
/// @see audio_controller.cpp
/// @ingroup audio_ui
#pragma once
#include <boost/filesystem/path.hpp>
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#include <cstdint>
#include <memory>
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#include <wx/event.h>
#include <wx/timer.h>
#include <wx/power.h>
#include <libaegisub/exception.h>
#include <libaegisub/fs_fwd.h>
#include <libaegisub/signal.h>
class AudioPlayer;
class AudioProvider;
class AudioTimingController;
namespace agi { struct Context; }
class TimeRange;
/// @class AudioController
/// @brief Manage an open audio stream
///
/// Creates and destroys audio providers and players. This behaviour should at
/// some point be moved to a separate class, as it adds too many
/// responsibilities to this class, but at the time of writing, it would extend
/// the scope of reworking components too much.
///
/// There is not supposed to be a way to get direct access to the audio
/// providers or players owned by a controller. If some operation that isn't
/// possible in the existing design is needed, the controller should be
/// extended in some way to allow it.
class AudioController final : public wxEvtHandler {
/// Project context this controller belongs to
agi::Context *context;
/// Slot for subtitles save signal
agi::signal::Connection subtitle_save_slot;
/// A new audio stream was opened (and any previously open was closed)
agi::signal::Signal<AudioProvider*> AnnounceAudioOpen;
/// The current audio stream was closed
agi::signal::Signal<> AnnounceAudioClose;
/// Playback is in progress and the current position was updated
agi::signal::Signal<int> AnnouncePlaybackPosition;
/// Playback has stopped
agi::signal::Signal<> AnnouncePlaybackStop;
/// The timing controller was replaced
agi::signal::Signal<> AnnounceTimingControllerChanged;
/// The audio output object
std::unique_ptr<AudioPlayer> player;
/// The audio provider
std::unique_ptr<AudioProvider> provider;
/// The current timing mode, if any; owned by the audio controller
std::unique_ptr<AudioTimingController> timing_controller;
/// The URL of the currently open audio, if any
agi::fs::path audio_url;
enum PlaybackMode {
PM_NotPlaying,
PM_Range,
PM_PrimaryRange,
PM_ToEnd
};
/// The current playback mode
PlaybackMode playback_mode;
/// Timer used for playback position updates
wxTimer playback_timer;
/// Event handler for the playback timer
void OnPlaybackTimer(wxTimerEvent &event);
/// @brief Timing controller signals primary playback range changed
void OnTimingControllerUpdatedPrimaryRange();
/// @brief Timing controller signals that the rendering style ranges have changed
void OnTimingControllerUpdatedStyleRanges();
/// Subtitles save slot which adds the audio uri to the subtitles
void OnSubtitlesSave();
/// Handler for the current audio player changing
void OnAudioPlayerChanged();
/// Handler for the current audio provider changing
void OnAudioProviderChanged();
#ifdef wxHAS_POWER_EVENTS
/// Handle computer going into suspend mode by stopping audio and closing device
void OnComputerSuspending(wxPowerEvent &event);
/// Handle computer resuming from suspend by re-opening the audio device
void OnComputerResuming(wxPowerEvent &event);
#endif
/// @brief Convert a count of audio samples to a time in milliseconds
/// @param samples Sample count to convert
/// @return The number of milliseconds equivalent to the sample-count, rounded down
int64_t MillisecondsFromSamples(int64_t samples) const;
/// @brief Convert a time in milliseconds to a count of audio samples
/// @param ms Time in milliseconds to convert
/// @return The index of the first sample that is wholly inside the millisecond
int64_t SamplesFromMilliseconds(int64_t ms) const;
public:
/// @brief Constructor
AudioController(agi::Context *context);
/// @brief Destructor
~AudioController();
/// @brief Open an audio stream
/// @param url URL of the stream to open
void OpenAudio(agi::fs::path const& url);
/// @brief Closes the current audio stream
void CloseAudio();
/// @brief Determine whether audio is currently open
/// @return True if an audio stream is open and can be played back
bool IsAudioOpen() const;
/// @brief Get the URL for the current open audio stream
/// @return The URL for the audio stream
///
/// The returned URL can be passed into OpenAudio() later to open the same
/// stream again.
agi::fs::path GetAudioURL() const { return audio_url; }
/// @brief Start or restart audio playback, playing a range
/// @param range The range of audio to play back
///
/// The end of the played back range may be requested changed, but is not
/// changed automatically from any other operations.
void PlayRange(const TimeRange &range);
/// @brief Start or restart audio playback, playing the primary playback range
///
/// If the primary playback range is updated during playback, the end of
/// the active playback range will be updated to match the new selection.
/// The playback end can not be changed in any other way.
void PlayPrimaryRange();
/// @brief Start or restart audio playback, playing from a point to the end of of the primary playback range
/// @param start_ms Time in milliseconds to start playback at
///
/// This behaves like PlayPrimaryRange, but the start point can differ from
/// the beginning of the primary range.
void PlayToEndOfPrimary(int start_ms);
/// @brief Start or restart audio playback, playing from a point to the end of stream
/// @param start_ms Time in milliseconds to start playback at
///
/// Playback to end cannot be converted to a range playback like range
/// playback can, it will continue until the end is reached, it is stopped,
/// or restarted.
void PlayToEnd(int start_ms);
/// @brief Stop all audio playback
void Stop();
/// @brief Determine whether playback is ongoing
/// @return True if audio is being played back
bool IsPlaying();
/// @brief Get the current playback position
/// @return Approximate current time in milliseconds being heard by the user
///
/// Returns 0 if playback is stopped. The return value is only approximate.
int GetPlaybackPosition();
/// Get the duration of the currently open audio in milliseconds, or 0 if none
/// @return Duration in milliseconds
int GetDuration() const;
/// @brief Get the primary playback range
/// @return An immutable TimeRange object
TimeRange GetPrimaryPlaybackRange() const;
/// @brief Set the playback audio volume
/// @param volume The new amplification factor for the audio
void SetVolume(double volume);
/// @brief Return the current timing controller
/// @return The current timing controller or 0
AudioTimingController * GetTimingController() const { return timing_controller.get(); }
/// @brief Change the current timing controller
/// @param new_mode The new timing controller or 0. This may be the same
/// object as the current timing controller, to signal that the timing
/// controller has changed the object being timed, e.g. changed to a new
/// dialogue line.
void SetTimingController(AudioTimingController *new_controller);
/// @brief Save a portion of the decoded loaded audio to a wav file
/// @param filename File to save to
/// @param range Time range to save
void SaveClip(agi::fs::path const& filename, TimeRange const& range) const;
DEFINE_SIGNAL_ADDERS(AnnounceAudioOpen, AddAudioOpenListener)
DEFINE_SIGNAL_ADDERS(AnnounceAudioClose, AddAudioCloseListener)
DEFINE_SIGNAL_ADDERS(AnnouncePlaybackPosition, AddPlaybackPositionListener)
DEFINE_SIGNAL_ADDERS(AnnouncePlaybackStop, AddPlaybackStopListener)
DEFINE_SIGNAL_ADDERS(AnnounceTimingControllerChanged, AddTimingControllerListener)
};
namespace agi {
/// Base class for all audio-related errors
DEFINE_BASE_EXCEPTION(AudioError, Exception)
/// Opening the audio failed for any reason
DEFINE_SIMPLE_EXCEPTION(AudioOpenError, AudioError, "audio/open")
/// There are no audio providers available to open audio files
DEFINE_SIMPLE_EXCEPTION(NoAudioProvidersError, AudioOpenError, "audio/open/no_providers")
/// The file exists, but no providers could find any audio tracks in it
DEFINE_SIMPLE_EXCEPTION(AudioDataNotFoundError, AudioOpenError, "audio/open/no_tracks")
/// There are audio tracks, but no provider could actually read them
DEFINE_SIMPLE_EXCEPTION(AudioProviderOpenError, AudioOpenError, "audio/open/provider")
/// The audio cache failed to initialize
DEFINE_SIMPLE_EXCEPTION(AudioCacheOpenError, AudioOpenError, "audio/open/cache")
/// There are no audio players available
DEFINE_SIMPLE_EXCEPTION(NoAudioPlayersError, AudioOpenError, "audio/open/no_players")
/// The audio player failed to initialize
DEFINE_SIMPLE_EXCEPTION(AudioPlayerOpenError, AudioOpenError, "audio/open/player")
}