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avcodec/fmvc: Move frame allocation to a later stage 

This way more things are checked before allocation

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 9783749c66)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2022-06-10 23:09:09 +02:00
parent f7c84aa4db
commit 6c6861279d
No known key found for this signature in database
GPG Key ID: B18E8928B3948D64
1 changed files with 15 additions and 6 deletions
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21
libavcodec/fmvc.c
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@ -401,20 +401,17 @@ static int decode_frame(AVCodecContext *avctx, void *data,
PutByteContext *pb = &s->pb;
AVFrame *frame = data;
int ret, y, x;
int key_frame;
if (avpkt->size < 8)
return AVERROR_INVALIDDATA;
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
return ret;
bytestream2_init(gb, avpkt->data, avpkt->size);
bytestream2_skip(gb, 2);
frame->key_frame = !!bytestream2_get_le16(gb);
frame->pict_type = frame->key_frame ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
key_frame = !!bytestream2_get_le16(gb);
if (frame->key_frame) {
if (key_frame) {
const uint8_t *src;
unsigned type, size;
uint8_t *dst;
@ -434,6 +431,12 @@ static int decode_frame(AVCodecContext *avctx, void *data,
return AVERROR_PATCHWELCOME;
}
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
return ret;
frame->key_frame = 1;
frame->pict_type = AV_PICTURE_TYPE_I;
src = s->buffer;
dst = frame->data[0] + (avctx->height - 1) * frame->linesize[0];
for (y = 0; y < avctx->height; y++) {
@ -512,6 +515,12 @@ static int decode_frame(AVCodecContext *avctx, void *data,
dst = &rect[block_h * s->stride];
}
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
return ret;
frame->key_frame = 0;
frame->pict_type = AV_PICTURE_TYPE_P;
ssrc = s->buffer;
ddst = frame->data[0] + (avctx->height - 1) * frame->linesize[0];
for (y = 0; y < avctx->height; y++) {