Signed-off-by: Justin Ruggles <justin.ruggles@gmail.com>
if (s->type == RT_BYTE_ENCODED) {
uint8_t value, value2;
int run;
- const uint8_t *end = pixels + avctx->height * linesize;
+ const uint8_t *start = linesize < 0 ? pixels + (avctx->height - 1) * linesize
+ : pixels;
+ const uint8_t *end = linesize < 0 ? pixels - linesize
+ : pixels + avctx->height * linesize;
ptr = pixels;
-#define GET_VALUE ptr >= end ? 0 : x >= len ? ptr[len-1] : ptr[x]
+#define GET_VALUE ptr >= end || ptr < start ? 0 : x >= len ? ptr[len-1] : ptr[x]
x = 0;
value2 = GET_VALUE;
- while (ptr < end) {
+ while (ptr < end && ptr >= start) {
run = 1;
value = value2;
x++;
}
value2 = GET_VALUE;
- while (value2 == value && run < 256 && ptr < end) {
+ while (value2 == value && run < 256 && ptr < end && ptr >= start) {
x++;
run++;
if (x >= alen) {