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Changed the rle encoder a little and made it more universal.

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Not only the repeated byte is calculated as (count ^ xor) + add
but also the raw encoding lenth byte is calculated as that too
patch by Xiaohui Sun sunxiaohui  dsp ac cn

Originally committed as revision 8602 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Xiaohui Sun
2007-04-03 06:40:21 +00:00
committed by Michael Niedermayer
parent 65df54496e
commit b25514a43f
3 changed files with 9 additions and 6 deletions
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7
libavcodec/rle.c
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@@ -55,7 +55,8 @@ static int count_pixels(const uint8_t *start, int len, int bpp, int same)
return count;
}
int ff_rle_encode(uint8_t *outbuf, int out_size, const uint8_t *ptr , int bpp, int w, int8_t add, uint8_t xor)
int ff_rle_encode(uint8_t *outbuf, int out_size, const uint8_t *ptr , int bpp, int w,
int8_t add_rep, uint8_t xor_rep,int8_t add_raw,uint8_t xor_raw)
{
int count, x;
uint8_t *out = outbuf;
@@ -64,13 +65,13 @@ int ff_rle_encode(uint8_t *outbuf, int out_size, const uint8_t *ptr , int bpp, i
/* see if we can encode the next set of pixels with RLE */
if((count = count_pixels(ptr, w-x, bpp, 1)) > 1) {
if(out + bpp + 1 > outbuf + out_size) return -1;
*out++ = (count ^ xor) + add;
*out++ = (count ^ xor_rep) + add_rep;
memcpy(out, ptr, bpp);
out += bpp;
} else {
/* fall back on uncompressed */
count = count_pixels(ptr, w-x, bpp, 0);
*out++ = count - 1;
*out++ = (count ^ xor_raw) + add_raw;
if(out + bpp*count > outbuf + out_size) return -1;
memcpy(out, ptr, bpp * count);