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fix output loop for small height

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the logic was broken in case of small height (1 macroblock row only).
This commit is contained in:
Pascal Massimino 2010-10-31 09:27:06 -07:00
parent cbfbb5c3b5
commit 296f691441
1 changed files with 34 additions and 37 deletions
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71
src/frame.c
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@ -223,52 +223,49 @@ void VP8StoreBlock(VP8Decoder* const dec) {
}
void VP8FilterRow(VP8Decoder* const dec, VP8Io* io) {
const int extra_y_rows = kFilterExtraRows[dec->filter_type_];
const int ysize = extra_y_rows * dec->cache_y_stride_;
const int uvsize = (extra_y_rows / 2) * dec->cache_uv_stride_;
const int first_row = (dec->mb_y_ == 0);
const int last_row = (dec->mb_y_ >= dec->mb_h_ - 1);
uint8_t* const ydst = dec->cache_y_ - ysize;
uint8_t* const udst = dec->cache_u_ - uvsize;
uint8_t* const vdst = dec->cache_v_ - uvsize;
int mb_x;
for (mb_x = 0; mb_x < dec->mb_w_; ++mb_x) {
DoFilter(dec, mb_x, dec->mb_y_);
}
{
const int extra_y_rows = kFilterExtraRows[dec->filter_type_];
const int ysize = extra_y_rows * dec->cache_y_stride_;
const int uvsize = (extra_y_rows / 2) * dec->cache_uv_stride_;
uint8_t* const ydst = dec->cache_y_ - ysize;
uint8_t* const udst = dec->cache_u_ - uvsize;
uint8_t* const vdst = dec->cache_v_ - uvsize;
if (io->put) {
int y_end;
if (dec->mb_y_ > 0) {
io->mb_y = dec->mb_y_ * 16 - extra_y_rows;
io->y = ydst;
io->u = udst;
io->v = vdst;
if (dec->mb_y_ < dec->mb_h_ - 1) {
y_end = io->mb_y + 16;
} else {
y_end = io->height; // last macroblock row.
}
} else { // first macroblock row.
io->mb_y = 0;
y_end = 16 - extra_y_rows;
io->y = dec->cache_y_;
io->u = dec->cache_u_;
io->v = dec->cache_v_;
}
if (y_end > io->height) {
y_end = io->height;
}
io->mb_h = y_end - io->mb_y;
io->put(io);
if (io->put) {
int y_start = dec->mb_y_ * 16;
int y_end = y_start + 16;
if (!first_row) {
y_start -= extra_y_rows;
io->y = ydst;
io->u = udst;
io->v = vdst;
} else {
io->y = dec->cache_y_;
io->u = dec->cache_u_;
io->v = dec->cache_v_;
}
if (!last_row) {
y_end -= extra_y_rows;
}
if (y_end > io->height) {
y_end = io->height;
}
io->mb_y = y_start;
io->mb_h = y_end - y_start;
io->put(io);
}
// rotate top samples
if (dec->mb_y_ < dec->mb_h_ - 1) {
memcpy(ydst, ydst + 16 * dec->cache_y_stride_, ysize);
memcpy(udst, udst + 8 * dec->cache_uv_stride_, uvsize);
memcpy(vdst, vdst + 8 * dec->cache_uv_stride_, uvsize);
}
if (!last_row) {
memcpy(ydst, ydst + 16 * dec->cache_y_stride_, ysize);
memcpy(udst, udst + 8 * dec->cache_uv_stride_, uvsize);
memcpy(vdst, vdst + 8 * dec->cache_uv_stride_, uvsize);
}
}
//-----------------------------------------------------------------------------
// Main reconstruction function.