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Increase FF_INPUT_BUFFER_PADDING_SIZE to 64.

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The purpose of this is to give decoders a reasonable amount of buffer to work
with before needing to check for overreads.

Originally committed as revision 22288 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Alex Converse
2010-03-07 21:16:44 +00:00
parent 57cb8d9831
commit 0f8e4dfe6e
1 changed files with 5 additions and 3 deletions
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8
libavcodec/avcodec.h
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@@ -424,12 +424,14 @@ enum SampleFormat {
/** /**
* Required number of additionally allocated bytes at the end of the input bitstream for decoding. * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
* This is mainly needed because some optimized bitstream readers read * The first 8 bytes are needed because some optimized bitstream readers read
* 32 or 64 bit at once and could read over the end.<br> * 32 or 64 bit at once and could read over the end. The remainder is to give
* decoders a reasonable amount of distance to work with before checking for
* buffer overreads.<br>
* Note: If the first 23 bits of the additional bytes are not 0, then damaged * Note: If the first 23 bits of the additional bytes are not 0, then damaged
* MPEG bitstreams could cause overread and segfault. * MPEG bitstreams could cause overread and segfault.
*/ */
#define FF_INPUT_BUFFER_PADDING_SIZE 8 #define FF_INPUT_BUFFER_PADDING_SIZE 64
/** /**
* minimum encoding buffer size * minimum encoding buffer size