[FFmpeg-cvslog] avutil/crc: Dont limit CRC32 standard tables
James Almer
git at videolan.org
Sat Jun 1 10:59:09 CEST 2013
ffmpeg | branch: master | James Almer <jamrial at gmail.com> | Sat Jun 1 01:36:38 2013 -0300| [c485c835fef46dea5dddf66243954275291dcdee] | committer: Michael Niedermayer
avutil/crc: Dont limit CRC32 standard tables
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 at gmx.at>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=c485c835fef46dea5dddf66243954275291dcdee
---
libavutil/crc.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/libavutil/crc.c b/libavutil/crc.c
index 9ee5efe..51fc83b 100644
--- a/libavutil/crc.c
+++ b/libavutil/crc.c
@@ -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)
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