Merge master.

[dcpomatic.git] / src / lib / audio_decoder.cc

diff --git a/src/lib/audio_decoder.cc b/src/lib/audio_decoder.cc
index aecf396440d63153a3c1c8a9cef4130af05502a4..8d3b0e1288ea5b53627a9cfb82619b0ccc125c7e 100644 (file)
--- a/src/lib/audio_decoder.cc
+++ b/src/lib/audio_decoder.cc
@@ -22,6 +22,8 @@
 #include "exceptions.h"
 #include "log.h"
 #include "resampler.h"
+#include "util.h"
+#include "film.h"
 
 #include "i18n.h"
 
@@ -35,22 +37,35 @@ using boost::shared_ptr;
 AudioDecoder::AudioDecoder (shared_ptr<const Film> film, shared_ptr<const AudioContent> content)
        : Decoder (film)
        , _audio_content (content)
-       , _last_audio (0)
 {
        if (content->output_audio_frame_rate() != content->content_audio_frame_rate() && content->audio_channels ()) {
                _resampler.reset (new Resampler (content->content_audio_frame_rate(), content->output_audio_frame_rate(), content->audio_channels ()));
        }
 }
 
+/** Audio timestamping is made hard by many factors, but the final nail in the coffin is resampling.
+ *  We have to assume that we are feeding continuous data into the resampler, and so we get continuous
+ *  data out.  Hence we do the timestamping here, post-resampler, just by counting samples.
+ *
+ *  The time is passed in here so that after a seek we can set up our _audio_position.  The
+ *  time is ignored once this has been done.
+ */
 void
 AudioDecoder::audio (shared_ptr<const AudioBuffers> data, ContentTime time)
 {
        if (_resampler) {
                data = _resampler->run (data);
        }
-       
-       _pending.push_back (shared_ptr<DecodedAudio> (new DecodedAudio (data, time)));
-       _last_audio = time + (data->frames() * TIME_HZ / _audio_content->output_audio_frame_rate());
+
+       if (!_audio_position) {
+               shared_ptr<const Film> film = _film.lock ();
+               assert (film);
+               FrameRateChange frc = film->active_frame_rate_change (_audio_content->position ());
+               _audio_position = (double (time) / frc.speed_up) * film->audio_frame_rate() / TIME_HZ;
+       }
+
+       _pending.push_back (shared_ptr<DecodedAudio> (new DecodedAudio (data, _audio_position.get ())));
+       _audio_position = _audio_position.get() + data->frames ();
 }
 
 void
@@ -62,6 +77,13 @@ AudioDecoder::flush ()
 
        shared_ptr<const AudioBuffers> b = _resampler->flush ();
        if (b) {
-               audio (b, _last_audio);
+               _pending.push_back (shared_ptr<DecodedAudio> (new DecodedAudio (b, _audio_position.get ())));
+               _audio_position = _audio_position.get() + b->frames ();
        }
 }
+
+void
+AudioDecoder::seek (ContentTime, bool)
+{
+       _audio_position.reset ();
+}