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Code Issues Releases Activity

avutil/crc: Dont limit CRC32 standard tables

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Currently, standard tables like AV_CRC_32_IEEE and such are being generated (or
provided in case the user compiles with hardcoded tables) with only 257 elements.
We're missing a considerable boost in performance by not making them with a size
of 1024 elements instead.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
James Almer
2013-06-01 01:36:38 -03:00
committed by Michael Niedermayer
parent 0c2f673ed2
commit c485c835fe
1 changed files with 6 additions and 1 deletions
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7
libavutil/crc.c
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@@ -211,6 +211,11 @@ static const AVCRC av_crc_table[AV_CRC_MAX][257] = {
},
};
#else
#if CONFIG_SMALL
#define CRC_TABLE_SIZE 257
#else
#define CRC_TABLE_SIZE 1024
#endif
static struct {
uint8_t le;
uint8_t bits;
@@ -222,7 +227,7 @@ static struct {
[AV_CRC_32_IEEE] = { 0, 32, 0x04C11DB7 },
[AV_CRC_32_IEEE_LE] = { 1, 32, 0xEDB88320 },
};
static AVCRC av_crc_table[AV_CRC_MAX][257];
static AVCRC av_crc_table[AV_CRC_MAX][CRC_TABLE_SIZE];
#endif
int av_crc_init(AVCRC *ctx, int le, int bits, uint32_t poly, int ctx_size)