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Code Issues Releases Activity

Use uint8_t instead of uint16_t pointer in kega decoder.

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This change allows to remove a few casts and avoids
a potential pointer aliasing violation.
This commit is contained in:
Carl Eugen Hoyos 2013-03-06 00:35:08 +01:00
parent 940b06aeb8
commit 96d2e4d61a
1 changed files with 7 additions and 6 deletions
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13
libavcodec/kgv1dec.c
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@ -50,7 +50,7 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
const uint8_t *buf_end = buf + avpkt->size; const uint8_t *buf_end = buf + avpkt->size;
KgvContext * const c = avctx->priv_data; KgvContext * const c = avctx->priv_data;
int offsets[8]; int offsets[8];
uint16_t *out, *prev; uint8_t *out, *prev;
int outcnt = 0, maxcnt; int outcnt = 0, maxcnt;
int w, h, i, res; int w, h, i, res;
@ -75,9 +75,9 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
c->cur.reference = 3; c->cur.reference = 3;
if ((res = ff_get_buffer(avctx, &c->cur)) < 0) if ((res = ff_get_buffer(avctx, &c->cur)) < 0)
return res; return res;
out = (uint16_t *) c->cur.data[0]; out = c->cur.data[0];
if (c->prev.data[0]) { if (c->prev.data[0]) {
prev = (uint16_t *) c->prev.data[0]; prev = c->prev.data[0];
} else { } else {
prev = NULL; prev = NULL;
} }
@ -90,7 +90,8 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
buf += 2; buf += 2;
if (!(code & 0x8000)) { if (!(code & 0x8000)) {
out[outcnt++] = code; // rgb555 pixel coded directly AV_WN16A(&out[2 * outcnt], code); // rgb555 pixel coded directly
outcnt++;
} else { } else {
int count; int count;
@ -119,7 +120,7 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
break; break;
} }
memcpy(out + outcnt, prev + start, 2 * count); memcpy(out + 2 * outcnt, prev + 2 * start, 2 * count);
} else { } else {
// copy from earlier in this frame // copy from earlier in this frame
int offset = (code & 0x1FFF) + 1; int offset = (code & 0x1FFF) + 1;
@ -137,7 +138,7 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
if (outcnt < offset || maxcnt - outcnt < count) if (outcnt < offset || maxcnt - outcnt < count)
break; break;
av_memcpy_backptr((uint8_t *)out + 2 * outcnt, 2 * offset, 2 * count); av_memcpy_backptr(out + 2 * outcnt, 2 * offset, 2 * count);
} }
outcnt += count; outcnt += count;
} }