Commit 84b6451d authored by Michael Niedermayer's avatar Michael Niedermayer

avcodec/vcr1: simplify code, drop buf_size

Signed-off-by: 's avatarMichael Niedermayer <michaelni@gmx.at>
parent a4e70918
......@@ -50,13 +50,13 @@ static int vcr1_decode_frame(AVCodecContext *avctx, void *data,
int *got_frame, AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
VCR1Context *const a = avctx->priv_data;
AVFrame *const p = data;
const uint8_t *bytestream = buf;
const uint8_t *bytestream_end = bytestream + avpkt->size;
int i, x, y, ret;
if(buf_size < 16 + avctx->height + avctx->width*avctx->height*5/8){
if(avpkt->size < 16 + avctx->height + avctx->width*avctx->height*5/8){
av_log(avctx, AV_LOG_ERROR, "Insufficient input data.\n");
return AVERROR(EINVAL);
}
......@@ -69,7 +69,6 @@ static int vcr1_decode_frame(AVCodecContext *avctx, void *data,
for (i = 0; i < 16; i++) {
a->delta[i] = *bytestream++;
bytestream++;
buf_size--;
}
for (y = 0; y < avctx->height; y++) {
......@@ -80,11 +79,10 @@ static int vcr1_decode_frame(AVCodecContext *avctx, void *data,
uint8_t *cb = &p->data[1][(y >> 2) * p->linesize[1]];
uint8_t *cr = &p->data[2][(y >> 2) * p->linesize[2]];
av_assert0 (buf_size >= 4 + avctx->width);
av_assert0 (bytestream_end - bytestream >= 4 + avctx->width);
for (i = 0; i < 4; i++)
a->offset[i] = *bytestream++;
buf_size -= 4;
offset = a->offset[0] - a->delta[bytestream[2] & 0xF];
for (x = 0; x < avctx->width; x += 4) {
......@@ -98,10 +96,9 @@ static int vcr1_decode_frame(AVCodecContext *avctx, void *data,
*cr++ = bytestream[1];
bytestream += 4;
buf_size -= 4;
}
} else {
av_assert0 (buf_size >= avctx->width / 2);
av_assert0 (bytestream_end - bytestream >= avctx->width / 2);
offset = a->offset[y & 3] - a->delta[bytestream[2] & 0xF];
......@@ -116,7 +113,6 @@ static int vcr1_decode_frame(AVCodecContext *avctx, void *data,
luma[7] = offset += a->delta[bytestream[1] >> 4];
luma += 8;
bytestream += 4;
buf_size -= 4;
}
}
}
......
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