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Code Issues Releases Activity

avfilter/vf_v360: add lagrange9 interpolation

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This commit is contained in:
Paul B Mahol 2020-03-31 13:22:10 +02:00
parent 7039045c56
commit b00b935d99
3 changed files with 59 additions and 0 deletions
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2
doc/filters.texi
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@ -19105,6 +19105,8 @@ Nearest neighbour.
@item line
@item linear
Bilinear interpolation.
@item lagrange9
Lagrange9 interpolation.
@item cube
@item cubic
Bicubic interpolation.

1
libavfilter/v360.h
View File

@ -57,6 +57,7 @@ enum Projections {
enum InterpMethod {
NEAREST,
BILINEAR,
LAGRANGE9,
BICUBIC,
LANCZOS,
SPLINE16,

56
libavfilter/vf_v360.c
View File

@ -112,6 +112,7 @@ static const AVOption v360_options[] = {
{ "nearest", "nearest neighbour", 0, AV_OPT_TYPE_CONST, {.i64=NEAREST}, 0, 0, FLAGS, "interp" },
{ "line", "bilinear interpolation", 0, AV_OPT_TYPE_CONST, {.i64=BILINEAR}, 0, 0, FLAGS, "interp" },
{ "linear", "bilinear interpolation", 0, AV_OPT_TYPE_CONST, {.i64=BILINEAR}, 0, 0, FLAGS, "interp" },
{ "lagrange9", "lagrange9 interpolation", 0, AV_OPT_TYPE_CONST, {.i64=LAGRANGE9}, 0, 0, FLAGS, "interp" },
{ "cube", "bicubic interpolation", 0, AV_OPT_TYPE_CONST, {.i64=BICUBIC}, 0, 0, FLAGS, "interp" },
{ "cubic", "bicubic interpolation", 0, AV_OPT_TYPE_CONST, {.i64=BICUBIC}, 0, 0, FLAGS, "interp" },
{ "lanc", "lanczos interpolation", 0, AV_OPT_TYPE_CONST, {.i64=LANCZOS}, 0, 0, FLAGS, "interp" },
@ -313,9 +314,11 @@ static int remap##ws##_##bits##bit_slice(AVFilterContext *ctx, void *arg, int jo
DEFINE_REMAP(1, 8)
DEFINE_REMAP(2, 8)
DEFINE_REMAP(3, 8)
DEFINE_REMAP(4, 8)
DEFINE_REMAP(1, 16)
DEFINE_REMAP(2, 16)
DEFINE_REMAP(3, 16)
DEFINE_REMAP(4, 16)
#define DEFINE_REMAP_LINE(ws, bits, div) \
@ -346,8 +349,10 @@ static void remap##ws##_##bits##bit_line_c(uint8_t *dst, int width, const uint8_
}
DEFINE_REMAP_LINE(2, 8, 1)
DEFINE_REMAP_LINE(3, 8, 1)
DEFINE_REMAP_LINE(4, 8, 1)
DEFINE_REMAP_LINE(2, 16, 2)
DEFINE_REMAP_LINE(3, 16, 2)
DEFINE_REMAP_LINE(4, 16, 2)
void ff_v360_init(V360Context *s, int depth)
@ -359,6 +364,9 @@ void ff_v360_init(V360Context *s, int depth)
case BILINEAR:
s->remap_line = depth <= 8 ? remap2_8bit_line_c : remap2_16bit_line_c;
break;
case LAGRANGE9:
s->remap_line = depth <= 8 ? remap3_8bit_line_c : remap3_16bit_line_c;
break;
case BICUBIC:
case LANCZOS:
case SPLINE16:
@ -417,6 +425,47 @@ static void bilinear_kernel(float du, float dv, const XYRemap *rmap,
ker[3] = lrintf( du * dv * 16385.f);
}
/**
* Calculate 1-dimensional lagrange coefficients.
*
* @param t relative coordinate
* @param coeffs coefficients
*/
static inline void calculate_lagrange_coeffs(float t, float *coeffs)
{
coeffs[0] = (t - 1.f) * (t - 2.f) * 0.5f;
coeffs[1] = -t * (t - 2.f);
coeffs[2] = t * (t - 1.f) * 0.5f;
}
/**
* Calculate kernel for lagrange interpolation.
*
* @param du horizontal relative coordinate
* @param dv vertical relative coordinate
* @param rmap calculated 4x4 window
* @param u u remap data
* @param v v remap data
* @param ker ker remap data
*/
static void lagrange_kernel(float du, float dv, const XYRemap *rmap,
int16_t *u, int16_t *v, int16_t *ker)
{
float du_coeffs[3];
float dv_coeffs[3];
calculate_lagrange_coeffs(du, du_coeffs);
calculate_lagrange_coeffs(dv, dv_coeffs);
for (int i = 0; i < 3; i++) {
for (int j = 0; j < 3; j++) {
u[i * 3 + j] = rmap->u[i + 1][j + 1];
v[i * 3 + j] = rmap->v[i + 1][j + 1];
ker[i * 3 + j] = lrintf(du_coeffs[j] * dv_coeffs[i] * 16385.f);
}
}
}
/**
* Calculate 1-dimensional cubic coefficients.
*
@ -3689,6 +3738,13 @@ static int config_output(AVFilterLink *outlink)
sizeof_uv = sizeof(int16_t) * s->elements;
sizeof_ker = sizeof(int16_t) * s->elements;
break;
case LAGRANGE9:
s->calculate_kernel = lagrange_kernel;
s->remap_slice = depth <= 8 ? remap3_8bit_slice : remap3_16bit_slice;
s->elements = 3 * 3;
sizeof_uv = sizeof(int16_t) * s->elements;
sizeof_ker = sizeof(int16_t) * s->elements;
break;
case BICUBIC:
s->calculate_kernel = bicubic_kernel;
s->remap_slice = depth <= 8 ? remap4_8bit_slice : remap4_16bit_slice;