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avcodec/vp56: Implement very basic error concealment 

This should fix the fate failure due to a truncated last frame.
Alternatively the frame could be dropped.

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit d34bf886e9)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-02-25 12:37:32 +01:00
parent 789da030ff
commit f46482f00c
2 changed files with 79 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

81
libavcodec/vp56.c
View File

@ -261,6 +261,25 @@ static VP56mb vp56_decode_mv(VP56Context *s, int row, int col)
return s->mb_type;
}
static VP56mb vp56_conceal_mv(VP56Context *s, int row, int col)
{
VP56mv *mv, vect = {0,0};
int b;
s->mb_type = VP56_MB_INTER_NOVEC_PF;
s->macroblocks[row * s->mb_width + col].type = s->mb_type;
mv = &vect;
s->macroblocks[row*s->mb_width + col].mv = *mv;
/* same vector for all blocks */
for (b=0; b<6; b++)
s->mv[b] = *mv;
return s->mb_type;
}
static void vp56_add_predictors_dc(VP56Context *s, VP56Frame ref_frame)
{
int idx = s->idct_scantable[0];
@ -457,6 +476,57 @@ static int vp56_decode_mb(VP56Context *s, int row, int col, int is_alpha)
return 0;
}
static int vp56_conceal_mb(VP56Context *s, int row, int col, int is_alpha)
{
AVFrame *frame_current, *frame_ref;
VP56mb mb_type;
VP56Frame ref_frame;
int b, ab, b_max, plane, off;
if (s->frames[VP56_FRAME_CURRENT]->key_frame)
mb_type = VP56_MB_INTRA;
else
mb_type = vp56_conceal_mv(s, row, col);
ref_frame = ff_vp56_reference_frame[mb_type];
frame_current = s->frames[VP56_FRAME_CURRENT];
frame_ref = s->frames[ref_frame];
if (mb_type != VP56_MB_INTRA && !frame_ref->data[0])
return 0;
ab = 6*is_alpha;
b_max = 6 - 2*is_alpha;
switch (mb_type) {
case VP56_MB_INTRA:
for (b=0; b<b_max; b++) {
plane = ff_vp56_b2p[b+ab];
s->vp3dsp.idct_put(frame_current->data[plane] + s->block_offset[b],
s->stride[plane], s->block_coeff[b]);
}
break;
case VP56_MB_INTER_NOVEC_PF:
case VP56_MB_INTER_NOVEC_GF:
for (b=0; b<b_max; b++) {
plane = ff_vp56_b2p[b+ab];
off = s->block_offset[b];
s->hdsp.put_pixels_tab[1][0](frame_current->data[plane] + off,
frame_ref->data[plane] + off,
s->stride[plane], 8);
s->vp3dsp.idct_add(frame_current->data[plane] + off,
s->stride[plane], s->block_coeff[b]);
}
break;
}
if (is_alpha) {
s->block_coeff[4][0] = 0;
s->block_coeff[5][0] = 0;
}
return 0;
}
static int vp56_size_changed(VP56Context *s)
{
AVCodecContext *avctx = s->avctx;
@ -592,6 +662,7 @@ static int ff_vp56_decode_mbs(AVCodecContext *avctx, void *data,
int block, y, uv;
ptrdiff_t stride_y, stride_uv;
int res;
int damaged = 0;
if (p->key_frame) {
p->pict_type = AV_PICTURE_TYPE_I;
@ -656,9 +727,13 @@ static int ff_vp56_decode_mbs(AVCodecContext *avctx, void *data,
s->block_offset[5] = s->block_offset[4];
for (mb_col=0; mb_col<s->mb_width; mb_col++) {
int ret = vp56_decode_mb(s, mb_row, mb_col, is_alpha);
if (ret < 0)
return ret;
if (!damaged) {
int ret = vp56_decode_mb(s, mb_row, mb_col, is_alpha);
if (ret < 0)
damaged = 1;
}
if (damaged)
vp56_conceal_mb(s, mb_row, mb_col, is_alpha);
for (y=0; y<4; y++) {
s->above_block_idx[y] += 2;

2
tests/ref/fate/vp5
View File

@ -245,4 +245,4 @@
0, 243, 243, 1, 233472, 0x6f530ac6
0, 244, 244, 1, 233472, 0x94f7466c
0, 245, 245, 1, 233472, 0xa8c1d365
0, 246, 246, 1, 233472, 0x8843293b
0, 246, 246, 1, 233472, 0xbf73f1b7