I'm getting a segfault upon calling mlt_frame_close after my consumer loop,
the code is below, and it's really simple, it just gets the frame with
rt_frame, and passes it to output. Output gets the image with
mlt_frame_get_image and copies it over to shared memory. The segfault
happens in the line marked with ///<<<<<<<<<<<<<<
I *think* it might have something to do with the playback velocity and
whatnot. I wasn't able to figure out how to force this to be real time, and
I'm thinking maybe I'm requesting the same frame twice and closing it or
something of the sort, although I have seen the segfault happen on the
first run of the thread loop
static void output( mlt_consumer this, void *share, int size, mlt_frame
frame ) {
// Get the properties
mlt_properties properties = MLT_CONSUMER_PROPERTIES( this );
mlt_image_format fmt = mlt_properties_get_int(properties, "_format");
int width = mlt_properties_get_int(properties, "width");
int height = mlt_properties_get_int(properties, "height");
pthread_rwlock_t *rwlock = mlt_properties_get_data(properties, "_rwlock",
NULL);
uint8_t *image=NULL;
mlt_frame_get_image(frame, &image, &fmt, &width, &height, 0);
int image_size = mlt_image_format_size(fmt, width, height, NULL);
pthread_rwlock_wrlock(rwlock);
void *walk = share;
uint32_t *header = (uint32_t*) walk;
header[0] = image_size;
header[1] = fmt;
header[2] = width;
header[3] = height;
walk = header + 4;
memcpy(walk, image, image_size);
walk += image_size;
pthread_rwlock_unlock(rwlock);
}
static void *consumer_thread( void *arg ) {
// Map the argument to the object
mlt_consumer this = arg;
// Get the properties
mlt_properties properties = MLT_CONSUMER_PROPERTIES( this );
// Get the terminate_on_pause property
int top = mlt_properties_get_int( properties, "terminate_on_pause" );
// Frame and size
mlt_frame frame = NULL;
// shared memory info
int size = 0;
uint8_t *share = mlt_properties_get_data(properties, "_writespace",
&size);
// Loop while running
while( mlt_properties_get_int( properties, "running" ) ) {
// Get the frame
frame = mlt_consumer_rt_frame( this );
// Check that we have a frame to work with
if ( frame != NULL ) {
// Terminate on pause
if ( top && mlt_properties_get_double( MLT_FRAME_PROPERTIES( frame ),
"_speed" ) == 0 ) {
mlt_frame_close( frame );
break;
}
output( this, share, size, frame );
mlt_frame_close(frame); ///<<<<<<<<<<<<<<
}
}
mlt_consumer_stopped( this );
return NULL;
}
Thanks
Tomas
--
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no such people" --Oscar Wilde
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