Optimise the feel of some GUI functions by doing the seek after

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

diff --git a/src/lib/butler.cc b/src/lib/butler.cc
index cf39945b646ddfed1ee63a5c85804795785899d8..2d6c46c7eea0b04f7cc880e0819fad7bb1badf4c 100644 (file)
--- a/src/lib/butler.cc
+++ b/src/lib/butler.cc
@@ -38,14 +38,15 @@ using boost::shared_ptr;
 using boost::bind;
 using boost::optional;
 using boost::function;
+using namespace dcpomatic;
 
 /** Minimum video readahead in frames */
 #define MINIMUM_VIDEO_READAHEAD 10
-/** Maximum video readahead in frames; should never be reached unless there are bugs in Player */
+/** Maximum video readahead in frames; should never be exceeded (by much) unless there are bugs in Player */
 #define MAXIMUM_VIDEO_READAHEAD 48
 /** Minimum audio readahead in frames */
 #define MINIMUM_AUDIO_READAHEAD (48000 * MINIMUM_VIDEO_READAHEAD / 24)
-/** Minimum audio readahead in frames; should never be reached unless there are bugs in Player */
+/** Maximum audio readahead in frames; should never be exceeded (by much) unless there are bugs in Player */
 #define MAXIMUM_AUDIO_READAHEAD (48000 * MAXIMUM_VIDEO_READAHEAD / 24)
 
 /** @param pixel_format Pixel format functor that will be used when calling ::image on PlayerVideos coming out of this
@@ -81,7 +82,7 @@ Butler::Butler (
        /* The butler must hear about things first, otherwise it might not sort out suspensions in time for
           get_video() to be called in response to this signal.
        */
-       _player_change_connection = _player->Change.connect (bind (&Butler::player_change, this, _1, _3), boost::signals2::at_front);
+       _player_change_connection = _player->Change.connect (bind (&Butler::player_change, this, _1), boost::signals2::at_front);
        _thread = new boost::thread (bind (&Butler::thread, this));
 #ifdef DCPOMATIC_LINUX
        pthread_setname_np (_thread->native_handle(), "butler");
@@ -124,14 +125,26 @@ Butler::should_run () const
 {
        if (_video.size() >= MAXIMUM_VIDEO_READAHEAD * 10) {
                /* This is way too big */
-               throw ProgrammingError
-                       (__FILE__, __LINE__, String::compose ("Butler video buffers reached %1 frames (audio is %2)", _video.size(), _audio.size()));
+               optional<DCPTime> pos = _audio.peek();
+               if (pos) {
+                       throw ProgrammingError
+                               (__FILE__, __LINE__, String::compose ("Butler video buffers reached %1 frames (audio is %2 at %3)", _video.size(), _audio.size(), pos->get()));
+               } else {
+                       throw ProgrammingError
+                               (__FILE__, __LINE__, String::compose ("Butler video buffers reached %1 frames (audio is %2)", _video.size(), _audio.size()));
+               }
        }
 
        if (_audio.size() >= MAXIMUM_AUDIO_READAHEAD * 10) {
                /* This is way too big */
-               throw ProgrammingError
-                       (__FILE__, __LINE__, String::compose ("Butler audio buffers reached %1 frames (video is %2)", _audio.size(), _video.size()));
+               optional<DCPTime> pos = _audio.peek();
+               if (pos) {
+                       throw ProgrammingError
+                               (__FILE__, __LINE__, String::compose ("Butler audio buffers reached %1 frames at %2 (video is %3)", _audio.size(), pos->get(), _video.size()));
+               } else {
+                       throw ProgrammingError
+                               (__FILE__, __LINE__, String::compose ("Butler audio buffers reached %1 frames (video is %3)", _audio.size(), _video.size()));
+               }
        }
 
        if (_video.size() >= MAXIMUM_VIDEO_READAHEAD * 2) {
@@ -203,12 +216,16 @@ try
        _arrived.notify_all ();
 }
 
+/** @param blocking true if we should block until video is available.  If blocking is false
+ *  and no video is immediately available the method will return a 0 PlayerVideo and the error AGAIN.
+ *  @param e if non-0 this is filled with an error code (if an error occurs) or is untouched if no error occurs.
+ */
 pair<shared_ptr<PlayerVideo>, DCPTime>
-Butler::get_video (Error* e)
+Butler::get_video (bool blocking, Error* e)
 {
        boost::mutex::scoped_lock lm (_mutex);
 
-       if (_suspended) {
+       if (_suspended || (_video.empty() && !blocking)) {
                if (e) {
                        *e = AGAIN;
                }
@@ -243,6 +260,7 @@ void
 Butler::seek (DCPTime position, bool accurate)
 {
        boost::mutex::scoped_lock lm (_mutex);
+       _awaiting = optional<DCPTime>();
        seek_unlocked (position, accurate);
 }
 
@@ -344,7 +362,7 @@ Butler::memory_used () const
 }
 
 void
-Butler::player_change (ChangeType type, bool frequent)
+Butler::player_change (ChangeType type)
 {
        boost::mutex::scoped_lock lm (_mutex);
 
@@ -352,7 +370,7 @@ Butler::player_change (ChangeType type, bool frequent)
                ++_suspended;
        } else if (type == CHANGE_TYPE_DONE) {
                --_suspended;
-               if (_died || _pending_seek_position || frequent) {
+               if (_died || _pending_seek_position) {
                        lm.unlock ();
                        _summon.notify_all ();
                        return;