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• Revision 5182befa49 : ads2armasm_ms : Add an ALIGN 4 after ENDP This makes sure that labels for data s

  19 mars 2014, par Martin Storsjo

  Changed Paths :
   Modify /build/make/ads2armasm_ms.pl

  
  
  ads2armasm_ms : Add an ALIGN 4 after ENDP

  This makes sure that labels for data symbols directly after
  functions get properly 4-byte-aligned (when the source is assembled
  in thumb mode).

  Previously, if declaring a data symbol directly after a function, the
  symbol could end up pointing to the unaligned address (if the total
  size of the thumb function didn't end up being a multiple of 4). The
  data in the symbol itself ended up aligned, but the symbol pointed to
  the preceding unaligned position.

  That is, a source file looking like this :
  — -
  ...
  ENDP

  symbol
  DCD 0x12345678
  — -

  could end up being assembled into
  symbol :
  xxxxx2 : 0000
  xxxxx4 : 5678
  xxxxx6 : 1234

  (This doesn't happen if the symbol label is on the same line as the
  DCD directive.)

  By adding an ALIGN 4 directly after the ENDP we make sure the symbol
  itself gets aligned properly.

  This isn't an issue with the original, untranslated arm source,
  since it only is built in arm mode where all instructions are 4 byte,
  and since the gnu assembler automatically adds the padding before the
  symbol even in thumb mode.

  Change-Id : Iadbeebd656b0197e423e79a12a7d3ef8859cf445

• Access files in a directory and write the file paths to a text file in ascending order using PHP

  26 mars 2014, par SCC

  I have a list of video files in my server. I would like to list out all the video files in this directory and write it to a text file. These video files are all having the same name output-x.mp4, and x is the number from 0 to an unknown figure. The total number of video files is dynamic and therefore I don't get to know the number of the last video. I have the below code to access all the video files in this directory. It works fine with only one problem : The video files written to the text file are not sorted in ascending order.

  $directory = "video/myvideo";
  
  $fp = fopen($_SERVER['DOCUMENT_ROOT']."Path/to/text/file", "wb");
  
  $split_video_files = scandir($directory);
  
  foreach($split_video_files as $file)
  
  {
  
      $content = "file ".$directory.$file."\r\n";
  
      fwrite($fp, $content);
  
  }
  
  fclose($fp);

  What the text file gave me is this :

  video/myvideo/output-0.mp4
  
  video/myvideo/output-1.mp4
  
  video/myvideo/output-10.mp4
  
  video/myvideo/output-11.mp4
  
  video/myvideo/output-12.mp4
  
  video/myvideo/output-13.mp4
  
  video/myvideo/output-14.mp4
  
  video/myvideo/output-2.mp4
  
  video/myvideo/output-3.mp4
  
  video/myvideo/output-4.mp4
  
  video/myvideo/output-5.mp4
  
  video/myvideo/output-6.mp4
  
  video/myvideo/output-7.mp4
  
  video/myvideo/output-8.mp4
  
  video/myvideo/output-9.mp4

  It lists out all the filename that start with "1" first before proceed to "2" and so on. Any ways for me to sort it in ascending order so that it starts from 0, 1, 2,… ?

• truehd : add hand-scheduled ARM asm version of ff_mlp_pack_output.

  20 mars 2014, par Ben Avison

  truehd : add hand-scheduled ARM asm version of ff_mlp_pack_output.
  Profiling results for overall decode and the output_data function in
  
  particular are as follows :
                Before          After
  
                Mean   StdDev   Mean   StdDev  Confidence  Change
  
  6:2 total     339.6  15.1     329.3  16.0    95.8%       +3.1%  (insignificant)
  
  6:2 function  24.6   6.0      9.9    3.1     100.0%      +148.5%
  
  8:2 total     324.5  15.5     323.6  14.3    15.2%       +0.3%  (insignificant)
  
  8:2 function  20.4   3.9      9.9    3.4     100.0%      +104.7%
  
  6:6 total     572.8  20.6     539.9  24.2    100.0%      +6.1%
  
  6:6 function  54.5   5.6      16.0   3.8     100.0%      +240.9%
  
  8:8 total     741.5  21.2     702.5  18.5    100.0%      +5.6%
  
  8:8 function  63.9   7.6      18.4   4.8     100.0%      +247.3%
  The assembly version has also been tested with a fuzz tester to ensure that
  
  any combinations of inputs not exercised by my available test streams still
  
  generate mathematically identical results to the C version.
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DBH] libavcodec/arm/Makefile
  • [DBH] libavcodec/arm/mlpdsp_armv6.S
  • [DBH] libavcodec/arm/mlpdsp_init_arm.c