/*
- Copyright (C) 2013 Carl Hetherington <cth@carlh.net>
+ Copyright (C) 2013-2014 Carl Hetherington <cth@carlh.net>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
return boost::filesystem::path ();
}
- return film->audio_analysis_path (dynamic_pointer_cast<const AudioContent> (shared_from_this ()));
+ boost::filesystem::path p = film->audio_analysis_dir ();
+ p /= digest ();
+ return p;
}
string
AudioContent::technical_summary () const
{
- return String::compose ("audio: channels %1, length %2, raw rate %3, out rate %4", audio_channels(), audio_length(), content_audio_frame_rate(), output_audio_frame_rate());
+ return String::compose (
+ "audio: channels %1, length %2, content rate %3, resampled rate %4",
+ audio_channels(),
+ audio_length().seconds(),
+ audio_frame_rate(),
+ resampled_audio_frame_rate()
+ );
}
-/** Note: this is not particularly fast, as the FrameRateChange lookup
- * is not very intelligent.
- *
- * @param t Some duration to convert.
- * @param at The time within the DCP to get the active frame rate change from; i.e. a point at which
- * the `controlling' video content is active.
+void
+AudioContent::set_audio_mapping (AudioMapping)
+{
+ signal_changed (AudioContentProperty::AUDIO_MAPPING);
+}
+
+/** @return the frame rate that this content should be resampled to in order
+ * that it is in sync with the active video content at its start time.
*/
-AudioContent::Frame
-AudioContent::time_to_content_audio_frames (DCPTime t, DCPTime at) const
+int
+AudioContent::resampled_audio_frame_rate () const
{
shared_ptr<const Film> film = _film.lock ();
assert (film);
- /* Consider the case where we're running a 25fps video at 24fps (i.e. slow)
- Our audio is at 44.1kHz. We will resample it to 48000 * 25 / 24 and then
- run it at 48kHz (i.e. slow, to match).
+ /* Resample to a DCI-approved sample rate */
+ double t = dcp_audio_frame_rate (audio_frame_rate ());
+
+ FrameRateChange frc = film->active_frame_rate_change (position ());
- After 1 second, we'll have run the equivalent of 44.1kHz * 24 / 25 samples
- in the source.
+ /* Compensate if the DCP is being run at a different frame rate
+ to the source; that is, if the video is run such that it will
+ look different in the DCP compared to the source (slower or faster).
*/
-
- return rint (t * content_audio_frame_rate() * film->active_frame_rate_change(at).speed_up / TIME_HZ);
+
+ if (frc.change_speed) {
+ t /= frc.speed_up;
+ }
+
+ return rint (t);
}