105 lines
2.7 KiB
Text
105 lines
2.7 KiB
Text
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/**
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* PANDA 3D SOFTWARE
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* Copyright (c) Carnegie Mellon University. All rights reserved.
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*
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* All use of this software is subject to the terms of the revised BSD
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* license. You should have received a copy of this license along
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* with this source code in a file named "LICENSE."
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*
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* @file movieAudioCursor.I
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* @author jyelon
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* @date 2007-07-02
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*/
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/**
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* Returns the MovieAudio which this cursor references.
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*/
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INLINE PT(MovieAudio) MovieAudioCursor::
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get_source() const {
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return _source;
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}
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/**
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* Returns the audio sample rate.
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*/
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INLINE int MovieAudioCursor::
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audio_rate() const {
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return _audio_rate;
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}
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/**
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* Returns the number of audio channels (ie, two for stereo, one for mono).
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*/
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INLINE int MovieAudioCursor::
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audio_channels() const {
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return _audio_channels;
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}
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/**
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* Returns the length of the movie. Attempting to read audio samples beyond
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* the specified length will produce silent samples.
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*
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* Some kinds of Movie, such as internet TV station, might not have a
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* predictable length. In that case, the length will be set to a very large
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* number: 1.0E10.
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*
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* Some AVI files have incorrect length values encoded into them - they may be
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* a second or two long or short. When playing such an AVI using the Movie
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* class, you may see a slightly truncated video, or a slightly elongated
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* video (padded with black frames). There are utilities out there to fix the
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* length values in AVI files.
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*
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* An audio consumer needs to check the length, the ready status, and the
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* aborted flag.
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*/
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INLINE double MovieAudioCursor::
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length() const {
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return _length;
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}
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/**
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* Returns true if the movie can seek. If this is true, seeking is still not
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* guaranteed to be fast: for some movies, seeking is implemented by rewinding
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* to the beginning and then fast-forwarding to the desired location. Even if
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* the movie cannot seek, the seek method can still advance to an arbitrary
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* location by reading samples and discarding them. However, to move
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* backward, can_seek must return true.
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*/
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INLINE bool MovieAudioCursor::
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can_seek() const {
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return _can_seek;
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}
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/**
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* Returns true if seek operations are constant time.
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*/
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INLINE bool MovieAudioCursor::
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can_seek_fast() const {
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return _can_seek_fast;
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}
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/**
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* If aborted is true, it means that the "ready" samples are not being
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* replenished. See the method "ready" for an explanation.
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*/
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INLINE bool MovieAudioCursor::
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aborted() const {
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return _aborted;
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}
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/**
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* Returns the current offset within the file.
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*/
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INLINE double MovieAudioCursor::
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tell() const {
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return _last_seek + ((_samples_read * 1.0) / _audio_rate);
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}
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/**
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* Skip audio samples from the stream. This is mostly for debugging purposes.
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*/
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INLINE void MovieAudioCursor::
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skip_samples(int n) {
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read_samples(n, (int16_t*)0);
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}
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