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non-open source projects at this time and not available for hire/paid
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the project, please post the full code of the contribution to a public
source repository for review and assistance, or fork/clone the MLT git
repo and include your contribution.
On Sun, Jun 30, 2013 at 11:21 AM, Tomas Neme <lacrymol...@gmail.com> wrote:
> 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
>
> --
> "The whole of Japan is pure invention. There is no such country, there are
> no such people" --Oscar Wilde
>
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