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checkasm: updated tests for sw_scale

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Change the reference to exactly match the C reference in swscale,
instead of exactly matching the x86 SIMD implementations (which
differs slightly). Test with and without SWS_ACCURATE_RND - if this
flag isn't set, the output must match the C reference exactly,
otherwise it is allowed to be off by 2.

Mark a couple x86 functions as unavailable when SWS_ACCURATE_RND
is set - apparently this discrepancy hasn't been noticed in other
exact tests before.

Add a test for yuv2plane1.

Signed-off-by: Jonathan Swinney <jswinney@amazon.com>
Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Swinney, Jonathan 2022-08-13 20:55:55 +00:00 committed by Martin Storsjö
parent 317f5252c0
commit 4dcd191a50
2 changed files with 155 additions and 43 deletions
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8
libswscale/x86/swscale.c
View File

@ -534,7 +534,8 @@ switch(c->dstBpc){ \
ASSIGN_SSE_SCALE_FUNC(c->hcScale, c->hChrFilterSize, sse2, sse2);
ASSIGN_VSCALEX_FUNC(c->yuv2planeX, sse2, ,
HAVE_ALIGNED_STACK || ARCH_X86_64);
ASSIGN_VSCALE_FUNC(c->yuv2plane1, sse2);
if (!(c->flags & SWS_ACCURATE_RND))
ASSIGN_VSCALE_FUNC(c->yuv2plane1, sse2);
switch (c->srcFormat) {
case AV_PIX_FMT_YA8:
@ -583,14 +584,15 @@ switch(c->dstBpc){ \
ASSIGN_VSCALEX_FUNC(c->yuv2planeX, sse4,
if (!isBE(c->dstFormat)) c->yuv2planeX = ff_yuv2planeX_16_sse4,
HAVE_ALIGNED_STACK || ARCH_X86_64);
if (c->dstBpc == 16 && !isBE(c->dstFormat))
if (c->dstBpc == 16 && !isBE(c->dstFormat) && !(c->flags & SWS_ACCURATE_RND))
c->yuv2plane1 = ff_yuv2plane1_16_sse4;
}
if (EXTERNAL_AVX(cpu_flags)) {
ASSIGN_VSCALEX_FUNC(c->yuv2planeX, avx, ,
HAVE_ALIGNED_STACK || ARCH_X86_64);
ASSIGN_VSCALE_FUNC(c->yuv2plane1, avx);
if (!(c->flags & SWS_ACCURATE_RND))
ASSIGN_VSCALE_FUNC(c->yuv2plane1, avx);
switch (c->srcFormat) {
case AV_PIX_FMT_YUYV422:

190
tests/checkasm/sw_scale.c
View File

@ -35,40 +35,140 @@
AV_WN32(buf + j, rnd()); \
} while (0)
// This reference function is the same approximate algorithm employed by the
// SIMD functions
static void ref_function(const int16_t *filter, int filterSize,
const int16_t **src, uint8_t *dest, int dstW,
const uint8_t *dither, int offset)
static void yuv2planeX_8_ref(const int16_t *filter, int filterSize,
const int16_t **src, uint8_t *dest, int dstW,
const uint8_t *dither, int offset)
{
int i, d;
d = ((filterSize - 1) * 8 + dither[0]) >> 4;
for ( i = 0; i < dstW; i++) {
int16_t val = d;
// This corresponds to the yuv2planeX_8_c function
int i;
for (i = 0; i < dstW; i++) {
int val = dither[(i + offset) & 7] << 12;
int j;
union {
int val;
int16_t v[2];
} t;
for (j = 0; j < filterSize; j++){
t.val = (int)src[j][i + offset] * (int)filter[j];
val += t.v[1];
}
dest[i]= av_clip_uint8(val>>3);
for (j = 0; j < filterSize; j++)
val += src[j][i] * filter[j];
dest[i]= av_clip_uint8(val >> 19);
}
}
static void check_yuv2yuvX(void)
static int cmp_off_by_n(const uint8_t *ref, const uint8_t *test, size_t n, int accuracy)
{
for (size_t i = 0; i < n; i++) {
if (abs(ref[i] - test[i]) > accuracy)
return 1;
}
return 0;
}
static void print_data(uint8_t *p, size_t len, size_t offset)
{
size_t i = 0;
for (; i < len; i++) {
if (i % 8 == 0) {
printf("0x%04zx: ", i+offset);
}
printf("0x%02x ", (uint32_t) p[i]);
if (i % 8 == 7) {
printf("\n");
}
}
if (i % 8 != 0) {
printf("\n");
}
}
static size_t show_differences(uint8_t *a, uint8_t *b, size_t len)
{
for (size_t i = 0; i < len; i++) {
if (a[i] != b[i]) {
size_t offset_of_mismatch = i;
size_t offset;
if (i >= 8) i-=8;
offset = i & (~7);
printf("test a:\n");
print_data(&a[offset], 32, offset);
printf("\ntest b:\n");
print_data(&b[offset], 32, offset);
printf("\n");
return offset_of_mismatch;
}
}
return len;
}
static void check_yuv2yuv1(int accurate)
{
struct SwsContext *ctx;
int osi, isi;
int dstW, offset;
size_t fail_offset;
const int input_sizes[] = {8, 24, 128, 144, 256, 512};
const int INPUT_SIZES = sizeof(input_sizes)/sizeof(input_sizes[0]);
#define LARGEST_INPUT_SIZE 512
const int offsets[] = {0, 3, 8, 11, 16, 19};
const int OFFSET_SIZES = sizeof(offsets)/sizeof(offsets[0]);
const char *accurate_str = (accurate) ? "accurate" : "approximate";
declare_func_emms(AV_CPU_FLAG_MMX, void,
const int16_t *src, uint8_t *dest,
int dstW, const uint8_t *dither, int offset);
LOCAL_ALIGNED_8(int16_t, src_pixels, [LARGEST_INPUT_SIZE]);
LOCAL_ALIGNED_8(uint8_t, dst0, [LARGEST_INPUT_SIZE]);
LOCAL_ALIGNED_8(uint8_t, dst1, [LARGEST_INPUT_SIZE]);
LOCAL_ALIGNED_8(uint8_t, dither, [8]);
randomize_buffers((uint8_t*)dither, 8);
randomize_buffers((uint8_t*)src_pixels, LARGEST_INPUT_SIZE * sizeof(int16_t));
ctx = sws_alloc_context();
if (accurate)
ctx->flags |= SWS_ACCURATE_RND;
if (sws_init_context(ctx, NULL, NULL) < 0)
fail();
ff_sws_init_scale(ctx);
for (isi = 0; isi < INPUT_SIZES; ++isi) {
dstW = input_sizes[isi];
for (osi = 0; osi < OFFSET_SIZES; osi++) {
offset = offsets[osi];
if (check_func(ctx->yuv2plane1, "yuv2yuv1_%d_%d_%s", offset, dstW, accurate_str)){
memset(dst0, 0, LARGEST_INPUT_SIZE * sizeof(dst0[0]));
memset(dst1, 0, LARGEST_INPUT_SIZE * sizeof(dst1[0]));
call_ref(src_pixels, dst0, dstW, dither, offset);
call_new(src_pixels, dst1, dstW, dither, offset);
if (cmp_off_by_n(dst0, dst1, dstW * sizeof(dst0[0]), accurate ? 0 : 2)) {
fail();
printf("failed: yuv2yuv1_%d_%di_%s\n", offset, dstW, accurate_str);
fail_offset = show_differences(dst0, dst1, LARGEST_INPUT_SIZE * sizeof(dst0[0]));
printf("failing values: src: 0x%04x dither: 0x%02x dst-c: %02x dst-asm: %02x\n",
(int) src_pixels[fail_offset],
(int) dither[(fail_offset + fail_offset) & 7],
(int) dst0[fail_offset],
(int) dst1[fail_offset]);
}
if(dstW == LARGEST_INPUT_SIZE)
bench_new(src_pixels, dst1, dstW, dither, offset);
}
}
}
sws_freeContext(ctx);
}
static void check_yuv2yuvX(int accurate)
{
struct SwsContext *ctx;
int fsi, osi, isi, i, j;
int dstW;
#define LARGEST_FILTER 16
#define FILTER_SIZES 4
static const int filter_sizes[FILTER_SIZES] = {1, 4, 8, 16};
// ff_yuv2planeX_8_sse2 can't handle odd filter sizes
const int filter_sizes[] = {2, 4, 8, 16};
const int FILTER_SIZES = sizeof(filter_sizes)/sizeof(filter_sizes[0]);
#define LARGEST_INPUT_SIZE 512
#define INPUT_SIZES 6
static const int input_sizes[INPUT_SIZES] = {8, 24, 128, 144, 256, 512};
static const int input_sizes[] = {8, 24, 128, 144, 256, 512};
const int INPUT_SIZES = sizeof(input_sizes)/sizeof(input_sizes[0]);
const char *accurate_str = (accurate) ? "accurate" : "approximate";
declare_func_emms(AV_CPU_FLAG_MMX, void, const int16_t *filter,
int filterSize, const int16_t **src, uint8_t *dest,
@ -89,6 +189,8 @@ static void check_yuv2yuvX(void)
randomize_buffers((uint8_t*)src_pixels, LARGEST_FILTER * LARGEST_INPUT_SIZE * sizeof(int16_t));
randomize_buffers((uint8_t*)filter_coeff, LARGEST_FILTER * sizeof(int16_t));
ctx = sws_alloc_context();
if (accurate)
ctx->flags |= SWS_ACCURATE_RND;
if (sws_init_context(ctx, NULL, NULL) < 0)
fail();
@ -96,33 +198,37 @@ static void check_yuv2yuvX(void)
for(isi = 0; isi < INPUT_SIZES; ++isi){
dstW = input_sizes[isi];
for(osi = 0; osi < 64; osi += 16){
for(fsi = 0; fsi < FILTER_SIZES; ++fsi){
if (dstW <= osi)
continue;
for (fsi = 0; fsi < FILTER_SIZES; ++fsi) {
src = av_malloc(sizeof(int16_t*) * filter_sizes[fsi]);
vFilterData = av_malloc((filter_sizes[fsi] + 2) * sizeof(union VFilterData));
memset(vFilterData, 0, (filter_sizes[fsi] + 2) * sizeof(union VFilterData));
for(i = 0; i < filter_sizes[fsi]; ++i){
for (i = 0; i < filter_sizes[fsi]; ++i) {
src[i] = &src_pixels[i * LARGEST_INPUT_SIZE];
vFilterData[i].src = src[i];
vFilterData[i].src = src[i] - osi;
for(j = 0; j < 4; ++j)
vFilterData[i].coeff[j + 4] = filter_coeff[i];
}
if (check_func(ctx->yuv2planeX, "yuv2yuvX_%d_%d_%d", filter_sizes[fsi], osi, dstW)){
if (check_func(ctx->yuv2planeX, "yuv2yuvX_%d_%d_%d_%s", filter_sizes[fsi], osi, dstW, accurate_str)){
// use vFilterData for the mmx function
const int16_t *filter = ctx->use_mmx_vfilter ? (const int16_t*)vFilterData : &filter_coeff[0];
memset(dst0, 0, LARGEST_INPUT_SIZE * sizeof(dst0[0]));
memset(dst1, 0, LARGEST_INPUT_SIZE * sizeof(dst1[0]));
// The reference function is not the scalar function selected when mmx
// is deactivated as the SIMD functions do not give the same result as
// the scalar ones due to rounding. The SIMD functions are activated by
// the flag SWS_ACCURATE_RND
ref_function(&filter_coeff[0], filter_sizes[fsi], src, dst0, dstW - osi, dither, osi);
// There's no point in calling new for the reference function
if(ctx->use_mmx_vfilter){
call_new((const int16_t*)vFilterData, filter_sizes[fsi], src, dst1, dstW - osi, dither, osi);
if (memcmp(dst0, dst1, LARGEST_INPUT_SIZE * sizeof(dst0[0])))
fail();
if(dstW == LARGEST_INPUT_SIZE)
bench_new((const int16_t*)vFilterData, filter_sizes[fsi], src, dst1, dstW - osi, dither, osi);
// We can't use call_ref here, because we don't know if use_mmx_vfilter was set for that
// function or not, so we can't pass it the parameters correctly.
yuv2planeX_8_ref(&filter_coeff[0], filter_sizes[fsi], src, dst0, dstW - osi, dither, osi);
call_new(filter, filter_sizes[fsi], src, dst1, dstW - osi, dither, osi);
if (cmp_off_by_n(dst0, dst1, LARGEST_INPUT_SIZE * sizeof(dst0[0]), accurate ? 0 : 2)) {
fail();
printf("failed: yuv2yuvX_%d_%d_%d_%s\n", filter_sizes[fsi], osi, dstW, accurate_str);
show_differences(dst0, dst1, LARGEST_INPUT_SIZE * sizeof(dst0[0]));
}
if(dstW == LARGEST_INPUT_SIZE)
bench_new((const int16_t*)vFilterData, filter_sizes[fsi], src, dst1, dstW - osi, dither, osi);
}
av_freep(&src);
av_freep(&vFilterData);
@ -245,6 +351,10 @@ void checkasm_check_sw_scale(void)
{
check_hscale();
report("hscale");
check_yuv2yuvX();
check_yuv2yuv1(0);
check_yuv2yuv1(1);
report("yuv2yuv1");
check_yuv2yuvX(0);
check_yuv2yuvX(1);
report("yuv2yuvX");
}