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SVQ3: do not modify const input buffer 

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Baptiste Coudurier 2011-05-05 15:17:51 +02:00 committed by Michael Niedermayer
parent b0e7a932e6
commit 2264c11081
1 changed files with 19 additions and 3 deletions
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22
libavcodec/svq3.c
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@ -70,6 +70,8 @@ typedef struct {
int unknown_flag;
int next_slice_index;
uint32_t watermark_key;
uint8_t *buf;
int buf_size;
} SVQ3Context;
#define FULLPEL_MODE 1
@ -927,12 +929,12 @@ static int svq3_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
SVQ3Context *svq3 = avctx->priv_data;
H264Context *h = &svq3->h;
MpegEncContext *s = &h->s;
int buf_size = avpkt->size;
int m, mb_type, left;
uint8_t *buf;
/* special case for last picture */
if (buf_size == 0) {
@ -944,10 +946,21 @@ static int svq3_decode_frame(AVCodecContext *avctx,
return 0;
}
init_get_bits (&s->gb, buf, 8*buf_size);
s->mb_x = s->mb_y = h->mb_xy = 0;
if (svq3->watermark_key) {
svq3->buf = av_fast_realloc(svq3->buf, &svq3->buf_size,
buf_size+FF_INPUT_BUFFER_PADDING_SIZE);
if (!svq3->buf)
return AVERROR(ENOMEM);
memcpy(svq3->buf, avpkt->data, buf_size);
buf = svq3->buf;
} else {
buf = avpkt->data;
}
init_get_bits(&s->gb, buf, 8*buf_size);
if (svq3_decode_slice_header(avctx))
return -1;
@ -1092,6 +1105,9 @@ static int svq3_decode_end(AVCodecContext *avctx)
MPV_common_end(s);
av_freep(&svq3->buf);
svq3->buf_size = 0;
return 0;
}