// 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);
}
class framerate_producer : public frame_producer_base
{
spl::shared_ptr<frame_producer> source_;
- boost::rational<int> source_framerate_;
- audio_channel_layout source_channel_layout_ = audio_channel_layout::invalid();
+ 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_;
std::vector<int> destination_audio_cadence_;
std::function<draw_frame (
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();
+ 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();
mutable_audio_buffer audio_samples_;
- unsigned int output_repeat_ = 0;
- unsigned int output_frame_ = 0;
+ unsigned int output_repeat_ = 0;
+ unsigned int output_frame_ = 0;
public:
framerate_producer(
spl::shared_ptr<frame_producer> source,
- boost::rational<int> source_framerate,
+ std::function<boost::rational<int> ()> get_source_framerate,
boost::rational<int> destination_framerate,
field_mode destination_fieldmode,
std::vector<int> destination_audio_cadence)
: source_(std::move(source))
- , source_framerate_(std::move(source_framerate))
- , destination_framerate_(std::move(destination_framerate))
- , destination_fieldmode_(destination_fieldmode)
+ , get_source_framerate_(std::move(get_source_framerate))
+ , original_destination_framerate_(std::move(destination_framerate))
+ , original_destination_fieldmode_(destination_fieldmode)
, destination_audio_cadence_(std::move(destination_audio_cadence))
{
- // 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_);
-
- if (diff_double < diff_keep) // Double rate interlaced
- {
- destination_framerate_ *= 2;
- }
- else // Progressive non interlaced
- {
- destination_fieldmode_ = field_mode::progressive;
- }
- }
- else // Progressive
- {
- 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;
- output_repeat_ = 2;
- }
- }
-
- 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
- || 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;
-
- CASPAR_LOG(warning) << source_->print() << L" Frame blending frame rate conversion required to conform to channel frame rate.";
- }
-
// Note: Uses 1 step rotated cadence for 1001 modes (1602, 1602, 1601, 1602, 1601)
// This cadence fills the audio mixer most optimally.
boost::range::rotate(destination_audio_cadence_, std::end(destination_audio_cadence_) - 1);
}
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
{
uint32_t nb_frames() const override
{
- return static_cast<uint32_t>(source_->nb_frames() * boost::rational_cast<double>(1 / get_speed() / (output_repeat_ != 0 ? 2 : 1)));
+ auto source_nb_frames = source_->nb_frames();
+ auto multiple = boost::rational_cast<double>(1 / get_speed() * (output_repeat_ != 0 ? 2 : 1));
+
+ return static_cast<uint32_t>(source_nb_frames * multiple);
}
uint32_t frame_number() const override
{
- return static_cast<uint32_t>(source_->frame_number() * boost::rational_cast<double>(1 / get_speed() / (output_repeat_ != 0 ? 2 : 1)));
+ auto source_frame_number = source_->frame_number() - 1; // next frame already received
+ auto multiple = boost::rational_cast<double>(1 / get_speed() * (output_repeat_ != 0 ? 2 : 1));
+
+ return static_cast<uint32_t>(source_frame_number * multiple);
}
constraints& pixel_constraints() override
{
user_speed_.fetch_and_tick();
- if (output_repeat_ && ++output_frame_ % output_repeat_)
+ if (output_repeat_ && output_frame_++ % output_repeat_)
{
auto frame = draw_frame::still(last_frame());
draw_frame pop_frame_from_source()
{
auto frame = source_->receive();
+ update_source_framerate();
if (user_speed_.fetch() == 1)
{
|| user_speed_.fetch() != 1
|| audio_samples_.size() / source_channel_layout_.num_channels >= destination_audio_cadence_.at(0);
}
+
+ void update_source_framerate()
+ {
+ auto source_framerate = get_source_framerate_();
+
+ if (source_framerate_ == source_framerate)
+ return;
+
+ source_framerate_ = source_framerate;
+ 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_);
+
+ if (diff_double < diff_keep) // Double rate interlaced
+ {
+ destination_framerate_ *= 2;
+ }
+ else // Progressive non interlaced
+ {
+ destination_fieldmode_ = field_mode::progressive;
+ }
+ }
+ else // Progressive
+ {
+ 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;
+ output_repeat_ = 2;
+ }
+ }
+
+ 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
+ || destination_fieldmode_ != field_mode::progressive;
+
+ 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.");
spl::shared_ptr<frame_producer> create_framerate_producer(
spl::shared_ptr<frame_producer> source,
- boost::rational<int> source_framerate,
+ std::function<boost::rational<int> ()> get_source_framerate,
boost::rational<int> destination_framerate,
field_mode destination_fieldmode,
std::vector<int> destination_audio_cadence)
{
return spl::make_shared<framerate_producer>(
std::move(source),
- std::move(source_framerate),
+ std::move(get_source_framerate),
std::move(destination_framerate),
destination_fieldmode,
std::move(destination_audio_cadence));
}
}}
-
projects / casparcg / blobdiff