Skip to content

F
ffmpeg.wasm-core
Commit faa94a57 authored by Paul B Mahol's avatar Paul B Mahol
Browse files
Options

avcodec/utvideodec: add support for gradient prediction 

Signed-off-by: 's avatarPaul B Mahol <onemda@gmail.com>
parent 2e664b9c
Hide whitespace changes
Inline Side-by-side
Showing with 225 additions and 5 deletions
libavcodec/utvideodec.c
View file @ faa94a57
......@@ -602,6 +602,189 @@ static void restore_median_packed_il(uint8_t *src, int step, ptrdiff_t stride,
}
}
static void restore_gradient_planar(UtvideoContext *c, uint8_t *src, ptrdiff_t stride,
int width, int height, int slices, int rmode)
{
int i, j, slice;
int A, B, C;
uint8_t *bsrc;
int slice_start, slice_height;
const int cmask = ~rmode;
for (slice = 0; slice < slices; slice++) {
slice_start = ((slice * height) / slices) & cmask;
slice_height = ((((slice + 1) * height) / slices) & cmask) -
slice_start;
if (!slice_height)
continue;
bsrc = src + slice_start * stride;
// first line - left neighbour prediction
bsrc[0] += 0x80;
c->llviddsp.add_left_pred(bsrc, bsrc, width, 0);
bsrc += stride;
if (slice_height <= 1)
continue;
for (j = 1; j < slice_height; j++) {
// second line - first element has top prediction, the rest uses gradient
bsrc[0] = (bsrc[0] + bsrc[-stride]) & 0xFF;
for (i = 1; i < width; i++) {
A = bsrc[i - stride];
B = bsrc[i - (stride + 1)];
C = bsrc[i - 1];
bsrc[i] = (A - B + C + bsrc[i]) & 0xFF;
}
bsrc += stride;
}
}
}
static void restore_gradient_planar_il(UtvideoContext *c, uint8_t *src, ptrdiff_t stride,
int width, int height, int slices, int rmode)
{
int i, j, slice;
int A, B, C;
uint8_t *bsrc;
int slice_start, slice_height;
const int cmask = ~(rmode ? 3 : 1);
const ptrdiff_t stride2 = stride << 1;
for (slice = 0; slice < slices; slice++) {
slice_start = ((slice * height) / slices) & cmask;
slice_height = ((((slice + 1) * height) / slices) & cmask) -
slice_start;
slice_height >>= 1;
if (!slice_height)
continue;
bsrc = src + slice_start * stride;
// first line - left neighbour prediction
bsrc[0] += 0x80;
A = c->llviddsp.add_left_pred(bsrc, bsrc, width, 0);
c->llviddsp.add_left_pred(bsrc + stride, bsrc + stride, width, A);
bsrc += stride2;
if (slice_height <= 1)
continue;
for (j = 1; j < slice_height; j++) {
// second line - first element has top prediction, the rest uses gradient
bsrc[0] = (bsrc[0] + bsrc[-stride2]) & 0xFF;
for (i = 1; i < width; i++) {
A = bsrc[i - stride2];
B = bsrc[i - (stride2 + 1)];
C = bsrc[i - 1];
bsrc[i] = (A - B + C + bsrc[i]) & 0xFF;
}
for (i = 0; i < width; i++) {
A = bsrc[i - stride];
B = bsrc[i - (1 + stride)];
C = bsrc[i - 1 + stride];
bsrc[i + stride] = (A - B + C + bsrc[i + stride]) & 0xFF;
}
bsrc += stride2;
}
}
}
static void restore_gradient_packed(uint8_t *src, int step, ptrdiff_t stride,
int width, int height, int slices, int rmode)
{
int i, j, slice;
int A, B, C;
uint8_t *bsrc;
int slice_start, slice_height;
const int cmask = ~rmode;
for (slice = 0; slice < slices; slice++) {
slice_start = ((slice * height) / slices) & cmask;
slice_height = ((((slice + 1) * height) / slices) & cmask) -
slice_start;
if (!slice_height)
continue;
bsrc = src + slice_start * stride;
// first line - left neighbour prediction
bsrc[0] += 0x80;
A = bsrc[0];
for (i = step; i < width * step; i += step) {
bsrc[i] += A;
A = bsrc[i];
}
bsrc += stride;
if (slice_height <= 1)
continue;
for (j = 1; j < slice_height; j++) {
// second line - first element has top prediction, the rest uses gradient
C = bsrc[-stride];
bsrc[0] += C;
for (i = step; i < width * step; i += step) {
A = bsrc[i - stride];
B = bsrc[i - (stride + step)];
C = bsrc[i - step];
bsrc[i] = (A - B + C + bsrc[i]) & 0xFF;
}
bsrc += stride;
}
}
}
static void restore_gradient_packed_il(uint8_t *src, int step, ptrdiff_t stride,
int width, int height, int slices, int rmode)
{
int i, j, slice;
int A, B, C;
uint8_t *bsrc;
int slice_start, slice_height;
const int cmask = ~(rmode ? 3 : 1);
const ptrdiff_t stride2 = stride << 1;
for (slice = 0; slice < slices; slice++) {
slice_start = ((slice * height) / slices) & cmask;
slice_height = ((((slice + 1) * height) / slices) & cmask) -
slice_start;
slice_height >>= 1;
if (!slice_height)
continue;
bsrc = src + slice_start * stride;
// first line - left neighbour prediction
bsrc[0] += 0x80;
A = bsrc[0];
for (i = step; i < width * step; i += step) {
bsrc[i] += A;
A = bsrc[i];
}
for (i = 0; i < width * step; i += step) {
bsrc[stride + i] += A;
A = bsrc[stride + i];
}
bsrc += stride2;
if (slice_height <= 1)
continue;
for (j = 1; j < slice_height; j++) {
// second line - first element has top prediction, the rest uses gradient
C = bsrc[-stride2];
bsrc[0] += C;
for (i = step; i < width * step; i += step) {
A = bsrc[i - stride2];
B = bsrc[i - (stride2 + step)];
C = bsrc[i - step];
bsrc[i] = (A - B + C + bsrc[i]) & 0xFF;
}
for (i = 0; i < width * step; i += step) {
A = bsrc[i - stride];
B = bsrc[i - (step + stride)];
C = bsrc[i - step + stride];
bsrc[i + stride] = (A - B + C + bsrc[i + stride]) & 0xFF;
}
bsrc += stride2;
}
}
}
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
AVPacket *avpkt)
{
......@@ -687,11 +870,6 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
c->frame_pred = (c->frame_info >> 8) & 3;
if (c->frame_pred == PRED_GRADIENT) {
avpriv_request_sample(avctx, "Frame with gradient prediction");
return AVERROR_PATCHWELCOME;
}
av_fast_malloc(&c->slice_bits, &c->slice_bits_size,
max_slice_size + AV_INPUT_BUFFER_PADDING_SIZE);
......@@ -721,6 +899,17 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
avctx->width, avctx->height, c->slices,
0);
}
} else if (c->frame_pred == PRED_GRADIENT) {
if (!c->interlaced) {
restore_gradient_packed(frame.f->data[0] + ff_ut_rgb_order[i],
c->planes, frame.f->linesize[0], avctx->width,
avctx->height, c->slices, 0);
} else {
restore_gradient_packed_il(frame.f->data[0] + ff_ut_rgb_order[i],
c->planes, frame.f->linesize[0],
avctx->width, avctx->height, c->slices,
0);
}
}
}
restore_rgb_planes(frame.f->data[0], c->planes, frame.f->linesize[0],
......@@ -757,6 +946,17 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
avctx->height >> !!i,
c->slices, !i);
}
} else if (c->frame_pred == PRED_GRADIENT) {
if (!c->interlaced) {
restore_gradient_planar(c, frame.f->data[i], frame.f->linesize[i],
avctx->width >> !!i, avctx->height >> !!i,
c->slices, !i);
} else {
restore_gradient_planar_il(c, frame.f->data[i], frame.f->linesize[i],
avctx->width >> !!i,
avctx->height >> !!i,
c->slices, !i);
}
}
}
break;
......@@ -777,6 +977,16 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
avctx->width >> !!i, avctx->height,
c->slices, 0);
}
} else if (c->frame_pred == PRED_GRADIENT) {
if (!c->interlaced) {
restore_gradient_planar(c, frame.f->data[i], frame.f->linesize[i],
avctx->width >> !!i, avctx->height,
c->slices, 0);
} else {
restore_gradient_planar_il(c, frame.f->data[i], frame.f->linesize[i],
avctx->width >> !!i, avctx->height,
c->slices, 0);
}
}
}
break;
......@@ -797,6 +1007,16 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
avctx->width, avctx->height,
c->slices, 0);
}
} else if (c->frame_pred == PRED_GRADIENT) {
if (!c->interlaced) {
restore_gradient_planar(c, frame.f->data[i], frame.f->linesize[i],
avctx->width, avctx->height,
c->slices, 0);
} else {
restore_gradient_planar_il(c, frame.f->data[i], frame.f->linesize[i],
avctx->width, avctx->height,
c->slices, 0);
}
}
}
break;
......
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment