static int transition_get_audio( mlt_frame frame, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
{
- // Get the properties of the a frame
- mlt_properties a_props = MLT_FRAME_PROPERTIES( frame );
-
// Get the b frame from the stack
mlt_frame b_frame = mlt_frame_pop_audio( frame );
// Get the properties of the b frame
mlt_properties b_props = MLT_FRAME_PROPERTIES( b_frame );
- // Restore the original get_audio
- frame->get_audio = mlt_properties_get_data( a_props, "mix.get_audio", NULL );
-
double mix_start = 0.5, mix_end = 0.5;
if ( mlt_properties_get( b_props, "audio.previous_mix" ) != NULL )
mix_start = mlt_properties_get_double( b_props, "audio.previous_mix" );
if ( mlt_properties_get( properties, "start" ) != NULL )
{
// Determine the time position of this frame in the transition duration
- mlt_position in = mlt_transition_get_in( this );
- mlt_position out = mlt_transition_get_out( this );
- mlt_position time = mlt_frame_get_position( b_frame );
+ mlt_properties props = mlt_properties_get_data( MLT_FRAME_PROPERTIES( b_frame ), "_producer", NULL );
+ int always_active = mlt_properties_get_int( MLT_TRANSITION_PROPERTIES( this ), "always_active" );
+ mlt_position in = !always_active ? mlt_transition_get_in( this ) : mlt_properties_get_int( props, "in" );
+ mlt_position out = !always_active ? mlt_transition_get_out( this ) : mlt_properties_get_int( props, "out" );
+ int length = mlt_properties_get_int( MLT_TRANSITION_PROPERTIES( this ), "length" );
+ mlt_position time = !always_active ? mlt_frame_get_position( b_frame ) : mlt_properties_get_int( props, "_frame" );
double mix = ( double )( time - in ) / ( double )( out - in + 1 );
-
- // If there is an end mix level adjust mix to the range
- if ( mlt_properties_get( properties, "end" ) != NULL )
- {
- double start = mlt_properties_get_double( properties, "start" );
- double end = mlt_properties_get_double( properties, "end" );
- mix = start + ( end - start ) * mix;
- }
- // A negative means total crossfade (uses position)
- else if ( mlt_properties_get_double( properties, "start" ) >= 0 )
+
+ // TODO: Check the logic here - shouldn't we be computing current and next mixing levels in all cases?
+ if ( length == 0 )
{
- // Otherwise, start/constructor is a constant mix level
- mix = mlt_properties_get_double( properties, "start" );
- }
+ // If there is an end mix level adjust mix to the range
+ if ( mlt_properties_get( properties, "end" ) != NULL )
+ {
+ double start = mlt_properties_get_double( properties, "start" );
+ double end = mlt_properties_get_double( properties, "end" );
+ mix = start + ( end - start ) * mix;
+ }
+ // A negative means total crossfade (uses position)
+ else if ( mlt_properties_get_double( properties, "start" ) >= 0 )
+ {
+ // Otherwise, start/constructor is a constant mix level
+ mix = mlt_properties_get_double( properties, "start" );
+ }
+
+ // Finally, set the mix property on the frame
+ mlt_properties_set_double( b_props, "audio.mix", mix );
- // Finally, set the mix property on the frame
- mlt_properties_set_double( b_props, "audio.mix", mix );
-
- // Initialise transition previous mix value to prevent an inadvertant jump from 0
- if ( mlt_properties_get( properties, "previous_mix" ) == NULL )
+ // Initialise transition previous mix value to prevent an inadvertant jump from 0
+ if ( mlt_properties_get( properties, "previous_mix" ) == NULL )
+ mlt_properties_set_double( properties, "previous_mix", mlt_properties_get_double( b_props, "audio.mix" ) );
+
+ // Tell b frame what the previous mix level was
+ mlt_properties_set_double( b_props, "audio.previous_mix", mlt_properties_get_double( properties, "previous_mix" ) );
+
+ // Save the current mix level for the next iteration
mlt_properties_set_double( properties, "previous_mix", mlt_properties_get_double( b_props, "audio.mix" ) );
-
- // Tell b frame what the previous mix level was
- mlt_properties_set_double( b_props, "audio.previous_mix", mlt_properties_get_double( properties, "previous_mix" ) );
-
- // Save the current mix level for the next iteration
- mlt_properties_set_double( properties, "previous_mix", mlt_properties_get_double( b_props, "audio.mix" ) );
- mlt_properties_set_double( b_props, "audio.reverse", mlt_properties_get_double( properties, "reverse" ) );
- }
-
- // Ensure that the tractor knows this isn't test audio...
- if ( mlt_properties_get_int( MLT_FRAME_PROPERTIES( a_frame ), "test_audio" ) )
- {
- mlt_properties_set_int( MLT_FRAME_PROPERTIES( a_frame ), "test_audio", 0 );
- mlt_properties_set_int( MLT_FRAME_PROPERTIES( a_frame ), "silent_audio", 1 );
+ mlt_properties_set_double( b_props, "audio.reverse", mlt_properties_get_double( properties, "reverse" ) );
+ }
+ else
+ {
+ double level = mlt_properties_get_double( properties, "start" );
+ double mix_start = level;
+ double mix_end = mix_start;
+ double mix_increment = 1.0 / length;
+ if ( time - in < length )
+ {
+ mix_start = mix_start * ( ( double )( time - in ) / length );
+ mix_end = mix_start + mix_increment;
+ }
+ else if ( time > out - length )
+ {
+ mix_end = mix_start * ( ( double )( out - time - in ) / length );
+ mix_start = mix_end - mix_increment;
+ }
+
+ mix_start = mix_start < 0 ? 0 : mix_start > level ? level : mix_start;
+ mix_end = mix_end < 0 ? 0 : mix_end > level ? level : mix_end;
+ mlt_properties_set_double( b_props, "audio.previous_mix", mix_start );
+ mlt_properties_set_double( b_props, "audio.mix", mix_end );
+ }
}
- // Backup the original get_audio (it's still needed)
- mlt_properties_set_data( MLT_FRAME_PROPERTIES( a_frame ), "mix.get_audio", a_frame->get_audio, 0, NULL, NULL );
-
// Override the get_audio method
- a_frame->get_audio = transition_get_audio;
-
mlt_frame_push_audio( a_frame, b_frame );
+ mlt_frame_push_audio( a_frame, transition_get_audio );
return a_frame;
}
this->process = transition_process;
if ( arg != NULL )
mlt_properties_set_double( MLT_TRANSITION_PROPERTIES( this ), "start", atof( arg ) );
- mlt_properties_set_int( MLT_TRANSITION_PROPERTIES( this ), "_accepts_blanks", 1 );
+ // Inform apps and framework that this is an audio only transition
+ mlt_properties_set_int( MLT_TRANSITION_PROPERTIES( this ), "_transition_type", 2 );
}
return this;
}
projects / mlt / blobdiff