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Add media flushing call on when writing bitstream (#554)

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Under certain circumstances, the Linux file system write behind caching
gets so much data to write in one go that is causes frames to be dropped.
The current fflush is not sufficient as that only flushes the C library
caches, not the Linux filesystem caches.

This fix forces data to be written to media as soon as it arrives, using
fdatasync().

Note, currently it's conditional on the --flush command line parameter.
This commit is contained in:
James Hughes
2019-06-03 11:43:34 +01:00
committed by Phil Elwell
parent 3ddc4e673a
commit 95b29b556a
1 changed files with 5 additions and 1 deletions
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6
host_applications/linux/apps/raspicam/RaspiVid.c
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@@ -1376,7 +1376,11 @@ static void encoder_buffer_callback(MMAL_PORT_T *port, MMAL_BUFFER_HEADER_T *buf
else
{
bytes_written = fwrite(buffer->data, 1, buffer->length, pData->file_handle);
if(pData->flush_buffers) fflush(pData->file_handle);
if(pData->flush_buffers)
{
fflush(pData->file_handle);
fdatasync(fileno(pData->file_handle));
}
if (pData->pstate->save_pts &&
!(buffer->flags & MMAL_BUFFER_HEADER_FLAG_CONFIG) &&