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• avcodec/mpegvideo_enc : Reduce stack usage

  18 mai, par Andreas Rheinhardt

  avcodec/mpegvideo_enc : Reduce stack usage
  Multiple PutBitContexts are used when encoding partitioned
  
  frames. When there are multiple candidates for macroblock types,
  
  multiple states (namely the state before encoding the current MB,
  
  the best state among the ones already tried and the current one)
  
  need to be kept ; duplicates of the PutBitContexts are among this
  
  state. The temporary buffers for them are kept on the stack
  
  in encode_thread() and their size is quite generous (MAX_MB_SIZE
  
   3000 bytes). This commit uses tighter bounds, bringing the
  
  size of the pb2 buffer down to 15 bytes.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavcodec/mpeg4videoenc.h
  • [DH] libavcodec/mpegvideo_enc.c

• avcodec/mpegvideo_enc : Don't use unnecessarily much stack

  25 mars, par Andreas Rheinhardt

  avcodec/mpegvideo_enc : Don't use unnecessarily much stack
  encode_thread() puts two MPVEncContexts (2*6516B here)
  
  on the stack and zeroes one of them in order to
  
  temporarily store the variables that get changed
  
  during encoding a macroblock (when there is more than
  
  one candidate type for a macroblock). This is wasteful
  
  and therefore this commit adds a small (328B here) structure
  
  to store exactly the fields that actually need to be backed
  
  up. Then one can extend MPVEncContext without fearing
  
  too use up to much stack.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavcodec/mpegvideo_enc.c

• avcodec/ffv1enc : reduce stack usage

  24 mars, par James Almer

  avcodec/ffv1enc : reduce stack usage
  Fixes failures in some systems since 171060d5dc54d1526abde736a711ce234df632f2.
  
  This can be further improved by only allocating the arrays when needed.
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DH] libavcodec/ffv1.h
  • [DH] libavcodec/ffv1enc.c