// Blends next frame with current frame when the distance is not 0.
// Completely sharp when distance is 0 but blurry when in between.
-draw_frame blend(const draw_frame& source, const draw_frame& destination, const boost::rational<int64_t>& distance)
+draw_frame blend2(const draw_frame& source, const draw_frame& destination, const boost::rational<int64_t>& distance)
{
if (destination == draw_frame::empty())
return source;
// * A distance of 0.0 gives 50% previous, 50% current and 0% next.
// * A distance of 0.5 gives 25% previous, 50% current and 25% next.
// * A distance of 0.75 gives 12.5% previous, 50% current and 37.5% next.
-// This is blurrier than blend, but gives a more even bluriness, instead of sharp, blurry, sharp, blurry.
-struct blend_all
+// This is blurrier than blend2, but gives a more even bluriness, instead of sharp, blurry, sharp, blurry.
+struct blend3
{
draw_frame previous_frame = draw_frame::empty();
draw_frame last_source = draw_frame::empty();
bool has_previous = previous_frame != draw_frame::empty();
if (!has_previous)
- return blend(source, destination, distance);
+ return blend2(source, destination, distance);
auto middle = last_source;
auto next_frame = destination;
double source = boost::rational_cast<double>(source_);
double delta = boost::rational_cast<double>(dest_) - source;
double result = tweener_(time_, source, delta, duration_);
-
+
return boost::rational<int64_t>(static_cast<int64_t>(result * 1000000.0), 1000000);
}
std::function<boost::rational<int>()> get_source_framerate_;
boost::rational<int> source_framerate_ = -1;
audio_channel_layout source_channel_layout_ = audio_channel_layout::invalid();
- boost::rational<int> original_destination_framerate_;
- field_mode original_destination_fieldmode_;
- boost::rational<int> destination_framerate_;
- field_mode destination_fieldmode_;
+ const boost::rational<int> original_destination_framerate_;
+ const field_mode original_destination_fieldmode_;
+ field_mode destination_fieldmode_ = field_mode::empty;
std::vector<int> destination_audio_cadence_;
boost::rational<std::int64_t> speed_;
speed_tweener user_speed_;
const draw_frame& source,
const draw_frame& destination,
const boost::rational<int64_t>& distance)> interpolator_ = drop_and_skip;
-
+
boost::rational<std::int64_t> current_frame_number_ = 0;
draw_frame previous_frame_ = draw_frame::empty();
draw_frame next_frame_ = draw_frame::empty();
unsigned int output_repeat_ = 0;
unsigned int output_frame_ = 0;
+ draw_frame last_frame_ = draw_frame::empty();
public:
framerate_producer(
spl::shared_ptr<frame_producer> source,
draw_frame receive_impl() override
{
+ // destination field mode initially unknown but known after the first update_source_framerate().
+ auto field1 = do_render_progressive_frame(true);
+
if (destination_fieldmode_ == field_mode::progressive)
{
- return do_render_progressive_frame(true);
+ return field1;
}
else
{
- auto field1 = do_render_progressive_frame(true);
auto field2 = do_render_progressive_frame(false);
return draw_frame::interlace(field1, field2, destination_fieldmode_);
}
else if (boost::iequals(params.at(1), L"interpolation"))
{
- if (boost::iequals(params.at(2), L"blend"))
- interpolator_ = &blend;
- else if (boost::iequals(params.at(2), L"blend_all"))
- interpolator_ = blend_all();
- else
+ if (boost::iequals(params.at(2), L"blend2"))
+ interpolator_ = &blend2;
+ else if (boost::iequals(params.at(2), L"blend3"))
+ interpolator_ = blend3();
+ else if (boost::iequals(params.at(2), L"drop_and_skip"))
interpolator_ = &drop_and_skip;
+ else
+ CASPAR_THROW_EXCEPTION(user_error() << msg_info("Valid interpolations are DROP_AND_SKIP, BLEND2 and BLEND3"));
}
else if (boost::iequals(params.at(1), L"output_repeat")) // Only for debugging purposes
{
if (output_repeat_ && output_frame_++ % output_repeat_)
{
- auto frame = draw_frame::still(last_frame());
+ auto frame = last_frame_;
frame.transform().audio_transform.volume = 0.0;
fast_forward_integer_frames(integer_next_frame - integer_current_frame);
+ last_frame_ = result;
+
if (sound)
return attach_sound(result);
else
if (source_framerate_ == source_framerate)
return;
- source_framerate_ = source_framerate;
- destination_framerate_ = original_destination_framerate_;
- destination_fieldmode_ = original_destination_fieldmode_;
+ output_repeat_ = 0;
+ output_frame_ = 0;
+ source_framerate_ = source_framerate;
+ auto destination_framerate = original_destination_framerate_;
+ destination_fieldmode_ = original_destination_fieldmode_;
// Coarse adjustment to correct fps family (23.98 - 30 vs 47.95 - 60)
if (destination_fieldmode_ != field_mode::progressive) // Interlaced output
{
- auto diff_double = boost::abs(source_framerate_ - destination_framerate_ * 2);
- auto diff_keep = boost::abs(source_framerate_ - destination_framerate_);
+ auto diff_double = boost::abs(source_framerate_ - destination_framerate * 2);
+ auto diff_keep = boost::abs(source_framerate_ - destination_framerate);
if (diff_double < diff_keep) // Double rate interlaced
{
- destination_framerate_ *= 2;
+ destination_framerate *= 2;
}
else // Progressive non interlaced
{
}
else // Progressive
{
- auto diff_halve = boost::abs(source_framerate_ * 2 - destination_framerate_);
- auto diff_keep = boost::abs(source_framerate_ - destination_framerate_);
+ auto diff_halve = boost::abs(source_framerate_ * 2 - destination_framerate);
+ auto diff_keep = boost::abs(source_framerate_ - destination_framerate);
if (diff_halve < diff_keep) // Repeat every frame two times
{
- destination_framerate_ /= 2;
+ destination_framerate /= 2;
output_repeat_ = 2;
}
}
- speed_ = boost::rational<int64_t>(source_framerate_ / destination_framerate_);
+ speed_ = boost::rational<int64_t>(source_framerate_ / destination_framerate);
// drop_and_skip will only be used by default for exact framerate multiples (half, same and double)
// for all other framerates a frame interpolator will be chosen.
if (speed_ != 1 && speed_ * 2 != 1 && speed_ != 2)
{
auto high_source_framerate = source_framerate_ > 47;
- auto high_destination_framerate = destination_framerate_ > 47
+ auto high_destination_framerate = destination_framerate > 47
|| destination_fieldmode_ != field_mode::progressive;
- if (high_source_framerate && high_destination_framerate) // The bluriness of blend_all is acceptable on high framerates.
- interpolator_ = blend_all();
- else // blend_all is mostly too blurry on low framerates. blend provides a compromise.
- interpolator_ = &blend;
+ if (high_source_framerate && high_destination_framerate) // The bluriness of blend3 is acceptable on high framerates.
+ interpolator_ = blend3();
+ else // blend3 is mostly too blurry on low framerates. blend2 provides a compromise.
+ interpolator_ = &blend2;
CASPAR_LOG(warning) << source_->print() << L" Frame blending frame rate conversion required to conform to channel frame rate.";
}
+ else
+ interpolator_ = &drop_and_skip;
}
};
void describe_framerate_producer(help_sink& sink)
{
sink.para()->text(L"Framerate conversion control / Slow motion examples:");
- sink.example(L">> CALL 1-10 FRAMERATE INTERPOLATION BLEND", L"enables 2 frame blend interpolation.");
- sink.example(L">> CALL 1-10 FRAMERATE INTERPOLATION BLEND_ALL", L"enables 3 frame blend interpolation.");
+ sink.example(L">> CALL 1-10 FRAMERATE INTERPOLATION BLEND2", L"enables 2 frame blend interpolation.");
+ sink.example(L">> CALL 1-10 FRAMERATE INTERPOLATION BLEND3", L"enables 3 frame blend interpolation.");
sink.example(L">> CALL 1-10 FRAMERATE INTERPOLATION DROP_AND_SKIP", L"disables frame interpolation.");
sink.example(L">> CALL 1-10 FRAMERATE SPEED 0.25", L"immediately changes the speed to 25%. Sound will be disabled.");
sink.example(L">> CALL 1-10 FRAMERATE SPEED 0.25 50", L"changes the speed to 25% linearly over 50 frames. Sound will be disabled.");
}
}}
-
projects / casparcg / blobdiff