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avfilter/unsharp: OpenCL unsharpen filter optimization: substitute N^2 filter computation with 2N+C

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i7-4770K luma 21% faster, chroma 18% faster A10-7850K luma 42% faster, chroma 37% faster on 1920x1080 res

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Alexey Titov 2015-02-10 12:21:05 -08:00 committed by Michael Niedermayer
parent ac494e5a66
commit a05a737316
3 changed files with 149 additions and 56 deletions
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4
libavfilter/unsharp.h
View File

@ -41,6 +41,10 @@ typedef struct {
cl_kernel kernel_chroma;
cl_mem cl_luma_mask;
cl_mem cl_chroma_mask;
cl_mem cl_luma_mask_x;
cl_mem cl_chroma_mask_x;
cl_mem cl_luma_mask_y;
cl_mem cl_chroma_mask_y;
int in_plane_size[8];
int out_plane_size[8];
int plane_num;

77
libavfilter/unsharp_opencl.c
View File

@ -87,11 +87,12 @@ end:
return ret;
}
static int compute_mask_matrix(cl_mem cl_mask_matrix, int step_x, int step_y)
static int copy_separable_masks(cl_mem cl_mask_x, cl_mem cl_mask_y, int step_x, int step_y)
{
int i, j, ret = 0;
uint32_t *mask_matrix, *mask_x, *mask_y;
size_t size_matrix = sizeof(uint32_t) * (2 * step_x + 1) * (2 * step_y + 1);
int ret = 0;
uint32_t *mask_x, *mask_y;
size_t size_mask_x = sizeof(uint32_t) * (2 * step_x + 1);
size_t size_mask_y = sizeof(uint32_t) * (2 * step_y + 1);
mask_x = av_mallocz_array(2 * step_x + 1, sizeof(uint32_t));
if (!mask_x) {
ret = AVERROR(ENOMEM);
@ -102,37 +103,36 @@ static int compute_mask_matrix(cl_mem cl_mask_matrix, int step_x, int step_y)
ret = AVERROR(ENOMEM);
goto end;
}
mask_matrix = av_mallocz(size_matrix);
if (!mask_matrix) {
ret = AVERROR(ENOMEM);
goto end;
}
ret = compute_mask(step_x, mask_x);
if (ret < 0)
goto end;
ret = compute_mask(step_y, mask_y);
if (ret < 0)
goto end;
for (j = 0; j < 2 * step_y + 1; j++) {
for (i = 0; i < 2 * step_x + 1; i++) {
mask_matrix[i + j * (2 * step_x + 1)] = mask_y[j] * mask_x[i];
}
}
ret = av_opencl_buffer_write(cl_mask_matrix, (uint8_t *)mask_matrix, size_matrix);
ret = av_opencl_buffer_write(cl_mask_x, (uint8_t *)mask_x, size_mask_x);
ret = av_opencl_buffer_write(cl_mask_y, (uint8_t *)mask_y, size_mask_y);
end:
av_freep(&mask_x);
av_freep(&mask_y);
av_freep(&mask_matrix);
return ret;
}
static int generate_mask(AVFilterContext *ctx)
{
UnsharpContext *unsharp = ctx->priv;
int i, ret = 0, step_x[2], step_y[2];
cl_mem masks[4];
cl_mem mask_matrix[2];
int i, ret = 0, step_x[2], step_y[2];
UnsharpContext *unsharp = ctx->priv;
mask_matrix[0] = unsharp->opencl_ctx.cl_luma_mask;
mask_matrix[1] = unsharp->opencl_ctx.cl_chroma_mask;
masks[0] = unsharp->opencl_ctx.cl_luma_mask_x;
masks[1] = unsharp->opencl_ctx.cl_luma_mask_y;
masks[2] = unsharp->opencl_ctx.cl_chroma_mask_x;
masks[3] = unsharp->opencl_ctx.cl_chroma_mask_y;
step_x[0] = unsharp->luma.steps_x;
step_x[1] = unsharp->chroma.steps_x;
step_y[0] = unsharp->luma.steps_y;
@ -144,12 +144,16 @@ static int generate_mask(AVFilterContext *ctx)
else
unsharp->opencl_ctx.use_fast_kernels = 1;
if (!masks[0] || !masks[1] || !masks[2] || !masks[3]) {
av_log(ctx, AV_LOG_ERROR, "Luma mask and chroma mask should not be NULL\n");
return AVERROR(EINVAL);
}
if (!mask_matrix[0] || !mask_matrix[1]) {
av_log(ctx, AV_LOG_ERROR, "Luma mask and chroma mask should not be NULL\n");
return AVERROR(EINVAL);
}
for (i = 0; i < 2; i++) {
ret = compute_mask_matrix(mask_matrix[i], step_x[i], step_y[i]);
ret = copy_separable_masks(masks[2*i], masks[2*i+1], step_x[i], step_y[i]);
if (ret < 0)
return ret;
}
@ -184,7 +188,8 @@ int ff_opencl_apply_unsharp(AVFilterContext *ctx, AVFrame *in, AVFrame *out)
ret = avpriv_opencl_set_parameter(&kernel1,
FF_OPENCL_PARAM_INFO(unsharp->opencl_ctx.cl_inbuf),
FF_OPENCL_PARAM_INFO(unsharp->opencl_ctx.cl_outbuf),
FF_OPENCL_PARAM_INFO(unsharp->opencl_ctx.cl_luma_mask),
FF_OPENCL_PARAM_INFO(unsharp->opencl_ctx.cl_luma_mask_x),
FF_OPENCL_PARAM_INFO(unsharp->opencl_ctx.cl_luma_mask_y),
FF_OPENCL_PARAM_INFO(unsharp->luma.amount),
FF_OPENCL_PARAM_INFO(unsharp->luma.scalebits),
FF_OPENCL_PARAM_INFO(unsharp->luma.halfscale),
@ -201,7 +206,8 @@ int ff_opencl_apply_unsharp(AVFilterContext *ctx, AVFrame *in, AVFrame *out)
ret = avpriv_opencl_set_parameter(&kernel2,
FF_OPENCL_PARAM_INFO(unsharp->opencl_ctx.cl_inbuf),
FF_OPENCL_PARAM_INFO(unsharp->opencl_ctx.cl_outbuf),
FF_OPENCL_PARAM_INFO(unsharp->opencl_ctx.cl_chroma_mask),
FF_OPENCL_PARAM_INFO(unsharp->opencl_ctx.cl_chroma_mask_x),
FF_OPENCL_PARAM_INFO(unsharp->opencl_ctx.cl_chroma_mask_y),
FF_OPENCL_PARAM_INFO(unsharp->chroma.amount),
FF_OPENCL_PARAM_INFO(unsharp->chroma.scalebits),
FF_OPENCL_PARAM_INFO(unsharp->chroma.halfscale),
@ -264,7 +270,9 @@ int ff_opencl_apply_unsharp(AVFilterContext *ctx, AVFrame *in, AVFrame *out)
return AVERROR_EXTERNAL;
}
}
clFinish(unsharp->opencl_ctx.command_queue);
//blocking map is suffficient, no need for clFinish
//clFinish(unsharp->opencl_ctx.command_queue);
return av_opencl_buffer_read_image(out->data, unsharp->opencl_ctx.out_plane_size,
unsharp->opencl_ctx.plane_num, unsharp->opencl_ctx.cl_outbuf,
unsharp->opencl_ctx.cl_outbuf_size);
@ -286,6 +294,27 @@ int ff_opencl_unsharp_init(AVFilterContext *ctx)
ret = av_opencl_buffer_create(&unsharp->opencl_ctx.cl_chroma_mask,
sizeof(uint32_t) * (2 * unsharp->chroma.steps_x + 1) * (2 * unsharp->chroma.steps_y + 1),
CL_MEM_READ_ONLY, NULL);
// separable filters
if (ret < 0)
return ret;
ret = av_opencl_buffer_create(&unsharp->opencl_ctx.cl_luma_mask_x,
sizeof(uint32_t) * (2 * unsharp->luma.steps_x + 1),
CL_MEM_READ_ONLY, NULL);
if (ret < 0)
return ret;
ret = av_opencl_buffer_create(&unsharp->opencl_ctx.cl_luma_mask_y,
sizeof(uint32_t) * (2 * unsharp->luma.steps_y + 1),
CL_MEM_READ_ONLY, NULL);
if (ret < 0)
return ret;
ret = av_opencl_buffer_create(&unsharp->opencl_ctx.cl_chroma_mask_x,
sizeof(uint32_t) * (2 * unsharp->chroma.steps_x + 1),
CL_MEM_READ_ONLY, NULL);
if (ret < 0)
return ret;
ret = av_opencl_buffer_create(&unsharp->opencl_ctx.cl_chroma_mask_y,
sizeof(uint32_t) * (2 * unsharp->chroma.steps_y + 1),
CL_MEM_READ_ONLY, NULL);
if (ret < 0)
return ret;
ret = generate_mask(ctx);
@ -339,6 +368,10 @@ void ff_opencl_unsharp_uninit(AVFilterContext *ctx)
av_opencl_buffer_release(&unsharp->opencl_ctx.cl_outbuf);
av_opencl_buffer_release(&unsharp->opencl_ctx.cl_luma_mask);
av_opencl_buffer_release(&unsharp->opencl_ctx.cl_chroma_mask);
av_opencl_buffer_release(&unsharp->opencl_ctx.cl_luma_mask_x);
av_opencl_buffer_release(&unsharp->opencl_ctx.cl_chroma_mask_x);
av_opencl_buffer_release(&unsharp->opencl_ctx.cl_luma_mask_y);
av_opencl_buffer_release(&unsharp->opencl_ctx.cl_chroma_mask_y);
clReleaseKernel(unsharp->opencl_ctx.kernel_default);
clReleaseKernel(unsharp->opencl_ctx.kernel_luma);
clReleaseKernel(unsharp->opencl_ctx.kernel_chroma);

124
libavfilter/unsharp_opencl_kernel.h
View File

@ -36,7 +36,8 @@ inline unsigned char clip_uint8(int a)
kernel void unsharp_luma(
global unsigned char *src,
global unsigned char *dst,
global int *mask,
global int *mask_x,
global int *mask_y,
int amount,
int scalebits,
int halfscale,
@ -59,10 +60,12 @@ kernel void unsharp_luma(
return;
}
local uchar l[32][32];
local int lc[LU_RADIUS_X*LU_RADIUS_Y];
local unsigned int l[32][32];
local unsigned int lcx[LU_RADIUS_X];
local unsigned int lcy[LU_RADIUS_Y];
int indexIx, indexIy, i, j;
//load up tile: actual workspace + halo of 8 points in x and y \n
for(i = 0; i <= 1; i++) {
indexIy = -8 + (blockIdx.y + i) * 16 + threadIdx.y;
indexIy = indexIy < 0 ? 0 : indexIy;
@ -76,27 +79,54 @@ kernel void unsharp_luma(
}
int indexL = threadIdx.y*16 + threadIdx.x;
if (indexL < LU_RADIUS_X*LU_RADIUS_Y)
lc[indexL] = mask[indexL];
if (indexL < LU_RADIUS_X)
lcx[indexL] = mask_x[indexL];
if (indexL < LU_RADIUS_Y)
lcy[indexL] = mask_y[indexL];
barrier(CLK_LOCAL_MEM_FENCE);
int idx, idy, maskIndex;
int sum = 0;
int steps_x = LU_RADIUS_X/2;
int steps_y = LU_RADIUS_Y/2;
//needed for unsharp mask application in the end \n
int orig_value = (int)l[threadIdx.y + 8][threadIdx.x + 8];
\n#pragma unroll\n
for (i = -steps_y; i <= steps_y; i++) {
idy = 8 + i + threadIdx.y;
\n#pragma unroll\n
for (j = -steps_x; j <= steps_x; j++) {
idx = 8 + j + threadIdx.x;
maskIndex = (i + steps_y)*LU_RADIUS_X + j + steps_x;
sum += (int)l[idy][idx] * lc[maskIndex];
int idx, idy, maskIndex;
int temp[2] = {0};
int steps_x = (LU_RADIUS_X-1)/2;
int steps_y = (LU_RADIUS_Y-1)/2;
// compute the actual workspace + left&right halos \n
\n#pragma unroll\n
for (j = 0; j <=1; j++) {
//extra work to cover left and right halos \n
idx = 16*j + threadIdx.x;
\n#pragma unroll\n
for (i = -steps_y; i <= steps_y; i++) {
idy = 8 + i + threadIdx.y;
maskIndex = (i + steps_y);
temp[j] += (int)l[idy][idx] * lcy[maskIndex];
}
}
int temp = (int)l[threadIdx.y + 8][threadIdx.x + 8];
int res = temp + (((temp - (int)((sum + halfscale) >> scalebits)) * amount) >> 16);
barrier(CLK_LOCAL_MEM_FENCE);
//save results from the vertical filter in local memory \n
idy = 8 + threadIdx.y;
\n#pragma unroll\n
for (j = 0; j <=1; j++) {
idx = 16*j + threadIdx.x;
l[idy][idx] = temp[j];
}
barrier(CLK_LOCAL_MEM_FENCE);
//compute results with the horizontal filter \n
int sum = 0;
idy = 8 + threadIdx.y;
\n#pragma unroll\n
for (j = -steps_x; j <= steps_x; j++) {
idx = 8 + j + threadIdx.x;
maskIndex = j + steps_x;
sum += (int)l[idy][idx] * lcx[maskIndex];
}
int res = orig_value + (((orig_value - (int)((sum + halfscale) >> scalebits)) * amount) >> 16);
if (globalIdx.x < width && globalIdx.y < height)
dst[globalIdx.x + globalIdx.y*dst_stride] = clip_uint8(res);
}
@ -104,7 +134,8 @@ kernel void unsharp_luma(
kernel void unsharp_chroma(
global unsigned char *src_y,
global unsigned char *dst_y,
global int *mask,
global int *mask_x,
global int *mask_y,
int amount,
int scalebits,
int halfscale,
@ -141,8 +172,9 @@ kernel void unsharp_chroma(
return;
}
local uchar l[32][32];
local int lc[CH_RADIUS_X*CH_RADIUS_Y];
local unsigned int l[32][32];
local unsigned int lcx[CH_RADIUS_X];
local unsigned int lcy[CH_RADIUS_Y];
int indexIx, indexIy, i, j;
for(i = 0; i <= 1; i++) {
indexIy = -8 + (blockIdx.y + i) * 16 + threadIdx.y;
@ -157,27 +189,51 @@ kernel void unsharp_chroma(
}
int indexL = threadIdx.y*16 + threadIdx.x;
if (indexL < CH_RADIUS_X*CH_RADIUS_Y)
lc[indexL] = mask[indexL];
if (indexL < CH_RADIUS_X)
lcx[indexL] = mask_x[indexL];
if (indexL < CH_RADIUS_Y)
lcy[indexL] = mask_y[indexL];
barrier(CLK_LOCAL_MEM_FENCE);
int orig_value = (int)l[threadIdx.y + 8][threadIdx.x + 8];
int idx, idy, maskIndex;
int sum = 0;
int steps_x = CH_RADIUS_X/2;
int steps_y = CH_RADIUS_Y/2;
int temp[2] = {0,0};
\n#pragma unroll\n
for (i = -steps_y; i <= steps_y; i++) {
idy = 8 + i + threadIdx.y;
for (j = 0; j <= 1; j++) {
idx = 16*j + threadIdx.x;
\n#pragma unroll\n
for (j = -steps_x; j <= steps_x; j++) {
idx = 8 + j + threadIdx.x;
maskIndex = (i + steps_y)*CH_RADIUS_X + j + steps_x;
sum += (int)l[idy][idx] * lc[maskIndex];
}
for (i = -steps_y; i <= steps_y; i++) {
idy = 8 + i + threadIdx.y;
maskIndex = i + steps_y;
temp[j] += (int)l[idy][idx] * lcy[maskIndex];
}
}
barrier(CLK_LOCAL_MEM_FENCE);
idy = 8 + threadIdx.y;
\n#pragma unroll\n
for (j = 0; j <= 1; j++) {
idx = 16*j + threadIdx.x;
l[idy][idx] = temp[j];
}
int temp = (int)l[threadIdx.y + 8][threadIdx.x + 8];
int res = temp + (((temp - (int)((sum + halfscale) >> scalebits)) * amount) >> 16);
barrier(CLK_LOCAL_MEM_FENCE);
//compute results with the horizontal filter \n
int sum = 0;
idy = 8 + threadIdx.y;
\n#pragma unroll\n
for (j = -steps_x; j <= steps_x; j++) {
idx = 8 + j + threadIdx.x;
maskIndex = j + steps_x;
sum += (int)l[idy][idx] * lcx[maskIndex];
}
int res = orig_value + (((orig_value - (int)((sum + halfscale) >> scalebits)) * amount) >> 16);
if (globalIdx.x < cw && globalIdx.y < ch)
dst[globalIdx.x + globalIdx.y*dst_stride_ch] = clip_uint8(res);
}