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avcodec/utvideodec: Move bitstream end check out of inner loop

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This is not needed when the buffer is large enough for the worst case of a line

2% faster vlc reading

Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-06-27 21:47:31 +02:00
parent b12a36170b
commit 1835c5e7a4
1 changed files with 12 additions and 10 deletions
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22
libavcodec/utvideodec.c
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@ -196,11 +196,6 @@ static int decode_plane10(UtvideoContext *c, int plane_no,
prev = 0x200;
for (j = sstart; j < send; j++) {
for (i = 0; i < width * step; i += step) {
if (get_bits_left(&gb) <= 0) {
av_log(c->avctx, AV_LOG_ERROR,
"Slice decoding ran out of bits\n");
goto fail;
}
pix = get_vlc2(&gb, vlc.table, vlc.bits, 3);
if (pix < 0) {
av_log(c->avctx, AV_LOG_ERROR, "Decoding error\n");
@ -214,6 +209,11 @@ static int decode_plane10(UtvideoContext *c, int plane_no,
dest[i] = pix;
}
dest += stride;
if (get_bits_left(&gb) < 0) {
av_log(c->avctx, AV_LOG_ERROR,
"Slice decoding ran out of bits\n");
goto fail;
}
}
if (get_bits_left(&gb) > 32)
av_log(c->avctx, AV_LOG_WARNING,
@ -302,11 +302,6 @@ static int decode_plane(UtvideoContext *c, int plane_no,
prev = 0x80;
for (j = sstart; j < send; j++) {
for (i = 0; i < width * step; i += step) {
if (get_bits_left(&gb) <= 0) {
av_log(c->avctx, AV_LOG_ERROR,
"Slice decoding ran out of bits\n");
goto fail;
}
pix = get_vlc2(&gb, vlc.table, vlc.bits, 3);
if (pix < 0) {
av_log(c->avctx, AV_LOG_ERROR, "Decoding error\n");
@ -318,6 +313,11 @@ static int decode_plane(UtvideoContext *c, int plane_no,
}
dest[i] = pix;
}
if (get_bits_left(&gb) < 0) {
av_log(c->avctx, AV_LOG_ERROR,
"Slice decoding ran out of bits\n");
goto fail;
}
dest += stride;
}
if (get_bits_left(&gb) > 32)
@ -610,6 +610,8 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
c->frame_pred = (c->frame_info >> 8) & 3;
max_slice_size += 4*avctx->width;
av_fast_malloc(&c->slice_bits, &c->slice_bits_size,
max_slice_size + AV_INPUT_BUFFER_PADDING_SIZE);