Timestamp audio emissions from butler and hence discard very late

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

diff --git a/src/lib/audio_ring_buffers.cc b/src/lib/audio_ring_buffers.cc
index 42115efa3e786835cfb7e62b20e31b80d8095f1f..f51ff8a38860e03b7d3e867b9fea9e861d46ead4 100644 (file)
--- a/src/lib/audio_ring_buffers.cc
+++ b/src/lib/audio_ring_buffers.cc
@@ -1,5 +1,5 @@
 /*
-    Copyright (C) 2016-2017 Carl Hetherington <cth@carlh.net>
+    Copyright (C) 2016-2018 Carl Hetherington <cth@carlh.net>
 
     This file is part of DCP-o-matic.
 
@@ -26,7 +26,11 @@
 
 using std::min;
 using std::cout;
+using std::make_pair;
+using std::pair;
+using std::list;
 using boost::shared_ptr;
+using boost::optional;
 
 AudioRingBuffers::AudioRingBuffers ()
        : _used_in_head (0)
@@ -35,23 +39,26 @@ AudioRingBuffers::AudioRingBuffers ()
 }
 
 void
-AudioRingBuffers::put (shared_ptr<const AudioBuffers> data)
+AudioRingBuffers::put (shared_ptr<const AudioBuffers> data, DCPTime time)
 {
        boost::mutex::scoped_lock lm (_mutex);
 
-       if (!_buffers.empty ()) {
-               DCPOMATIC_ASSERT (_buffers.front()->channels() == data->channels());
+       if (!_buffers.empty()) {
+               DCPOMATIC_ASSERT (_buffers.front().first->channels() == data->channels());
+               DCPOMATIC_ASSERT ((_buffers.back().second + DCPTime::from_frames(_buffers.back().first->frames(), 48000)) == time);
        }
 
-       _buffers.push_back (data);
+       _buffers.push_back(make_pair(data, time));
 }
 
-/** @return true if there was an underrun, otherwise false */
-bool
+/** @return time of the returned data; if it's not set this indicates an underrun */
+optional<DCPTime>
 AudioRingBuffers::get (float* out, int channels, int frames)
 {
        boost::mutex::scoped_lock lm (_mutex);
 
+       optional<DCPTime> time;
+
        while (frames > 0) {
                if (_buffers.empty ()) {
                        for (int i = 0; i < frames; ++i) {
@@ -60,14 +67,17 @@ AudioRingBuffers::get (float* out, int channels, int frames)
                                }
                        }
                        cout << "audio underrun; missing " << frames << "!\n";
-                       return true;
+                       return time;
                }
 
-               shared_ptr<const AudioBuffers> front = _buffers.front ();
+               pair<shared_ptr<const AudioBuffers>, DCPTime> front = _buffers.front ();
+               if (!time) {
+                       time = front.second + DCPTime::from_frames(_used_in_head, 48000);
+               }
 
-               int const to_do = min (frames, front->frames() - _used_in_head);
-               float** p = front->data();
-               int const c = min (front->channels(), channels);
+               int const to_do = min (frames, front.first->frames() - _used_in_head);
+               float** p = front.first->data();
+               int const c = min (front.first->channels(), channels);
                for (int i = 0; i < to_do; ++i) {
                        for (int j = 0; j < c; ++j) {
                                *out++ = p[j][i + _used_in_head];
@@ -79,13 +89,13 @@ AudioRingBuffers::get (float* out, int channels, int frames)
                _used_in_head += to_do;
                frames -= to_do;
 
-               if (_used_in_head == front->frames()) {
+               if (_used_in_head == front.first->frames()) {
                        _buffers.pop_front ();
                        _used_in_head = 0;
                }
        }
 
-       return false;
+       return time;
 }
 
 void
@@ -101,8 +111,8 @@ AudioRingBuffers::size () const
 {
        boost::mutex::scoped_lock lm (_mutex);
        Frame s = 0;
-       BOOST_FOREACH (shared_ptr<const AudioBuffers> i, _buffers) {
-               s += i->frames ();
+       for (list<pair<shared_ptr<const AudioBuffers>, DCPTime> >::const_iterator i = _buffers.begin(); i != _buffers.end(); ++i) {
+               s += i->first->frames();
        }
        return s - _used_in_head;
 }