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avcodec/dnxhd_parser: take into account compressed frame size and skip it

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Fixes #6214 and vsynth1-dnxhd-720p-hr-lb.

Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol 2017-03-20 22:47:48 +01:00
parent ac42f08099
commit e1940d2458
2 changed files with 60 additions and 9 deletions
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65
libavcodec/dnxhd_parser.c
View File

@ -31,8 +31,24 @@ typedef struct {
ParseContext pc;
int interlaced;
int cur_field; /* first field is 0, second is 1 */
int cur_byte;
int remaining;
int w, h;
} DNXHDParserContext;
static int dnxhd_get_hr_frame_size(int cid, int w, int h)
{
int result, i = ff_dnxhd_get_cid_table(cid);
if (i < 0)
return i;
result = ((h + 15) / 16) * ((w + 15) / 16) * ff_dnxhd_cid_table[i].packet_scale.num / ff_dnxhd_cid_table[i].packet_scale.den;
result = (result + 2048) / 4096 * 4096;
return FFMAX(result, 8192);
}
static int dnxhd_find_frame_end(DNXHDParserContext *dctx,
const uint8_t *buf, int buf_size)
{
@ -51,30 +67,65 @@ static int dnxhd_find_frame_end(DNXHDParserContext *dctx,
pic_found = 1;
interlaced = (state&2)>>1; /* byte following the 5-byte header prefix */
cur_field = state&1;
dctx->cur_byte = 0;
dctx->remaining = 0;
break;
}
}
}
if (pic_found) {
if (pic_found && !dctx->remaining) {
if (!buf_size) /* EOF considered as end of frame */
return 0;
for (; i < buf_size; i++) {
dctx->cur_byte++;
state = (state << 8) | buf[i];
if (ff_dnxhd_check_header_prefix(state & 0xffffffffff00LL) != 0) {
if (!interlaced || dctx->cur_field) {
if (dctx->cur_byte == 24) {
dctx->h = (state >> 32) & 0xFFFF;
} else if (dctx->cur_byte == 26) {
dctx->w = (state >> 32) & 0xFFFF;
} else if (dctx->cur_byte == 42) {
int cid = (state >> 32) & 0xFFFFFFFF;
if (cid <= 0)
continue;
dctx->remaining = avpriv_dnxhd_get_frame_size(cid);
if (dctx->remaining <= 0) {
dctx->remaining = dnxhd_get_hr_frame_size(cid, dctx->w, dctx->h);
if (dctx->remaining <= 0)
return dctx->remaining;
}
if (buf_size - i >= dctx->remaining && (!dctx->interlaced || dctx->cur_field)) {
int remaining = dctx->remaining;
pc->frame_start_found = 0;
pc->state64 = -1;
dctx->interlaced = interlaced;
dctx->cur_field = 0;
return i - 5;
dctx->cur_byte = 0;
dctx->remaining = 0;
return remaining;
} else {
/* continue, to get the second field */
dctx->interlaced = interlaced = (state&2)>>1;
dctx->cur_field = cur_field = state&1;
dctx->remaining -= buf_size;
}
}
}
} else if (pic_found) {
if (dctx->remaining > buf_size) {
dctx->remaining -= buf_size;
} else {
int remaining = dctx->remaining;
pc->frame_start_found = 0;
pc->state64 = -1;
dctx->interlaced = interlaced;
dctx->cur_field = 0;
dctx->cur_byte = 0;
dctx->remaining = 0;
return remaining;
}
}
pc->frame_start_found = pic_found;
pc->state64 = state;

4
tests/ref/vsynth/vsynth1-dnxhd-720p-hr-lb
View File

@ -1,4 +1,4 @@
08cbfe9b9f671cdb9dddc9307121d107 *tests/data/fate/vsynth1-dnxhd-720p-hr-lb.dnxhd
409600 tests/data/fate/vsynth1-dnxhd-720p-hr-lb.dnxhd
22eb87f0f8a50278355006fef70073a9 *tests/data/fate/vsynth1-dnxhd-720p-hr-lb.out.rawvideo
stddev: 7.49 PSNR: 30.63 MAXDIFF: 64 bytes: 7603200/ 608256
77e510e3538313b1cbafb86ed248d2df *tests/data/fate/vsynth1-dnxhd-720p-hr-lb.out.rawvideo
stddev: 7.50 PSNR: 30.62 MAXDIFF: 64 bytes: 7603200/ 760320