mirror of
https://git.videolan.org/git/ffmpeg.git
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![Ganesh Ajjanagadde](/assets/img/avatar_default.png)
FFDIFFSIGN was created explicitly for this purpose, since the common return a - b idiom is unsafe regarding overflow on signed integers. It optimizes to branchless code on common compilers. FFDIFFSIGN also has the subjective benefit of being easier to read due to lack of ternary operators. Tested with FATE. Things not covered by this are unsigned integers, for which overflows are well defined, and also places where overflow is clearly impossible, e.g an instance where the a - b was being done on 24 bit values. Reviewed-by: Michael Niedermayer <michael@niedermayer.cc> Reviewed-by: Clément Bœsch <u@pkh.me> Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>
279 lines
10 KiB
C
279 lines
10 KiB
C
/*
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* Copyright (C) 2013 Lenny Wang
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/opt.h"
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#include "libavutil/time.h"
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#include "libavutil/log.h"
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#include "libavutil/opencl.h"
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#include "libavutil/avstring.h"
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#include "cmdutils.h"
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typedef struct {
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int platform_idx;
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int device_idx;
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char device_name[64];
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int64_t runtime;
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} OpenCLDeviceBenchmark;
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const char *ocl_bench_source = AV_OPENCL_KERNEL(
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inline unsigned char clip_uint8(int a)
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{
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if (a & (~0xFF))
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return (-a)>>31;
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else
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return a;
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}
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kernel void unsharp_bench(
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global unsigned char *src,
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global unsigned char *dst,
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global int *mask,
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int width,
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int height)
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{
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int i, j, local_idx, lc_idx, sum = 0;
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int2 thread_idx, block_idx, global_idx, lm_idx;
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thread_idx.x = get_local_id(0);
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thread_idx.y = get_local_id(1);
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block_idx.x = get_group_id(0);
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block_idx.y = get_group_id(1);
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global_idx.x = get_global_id(0);
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global_idx.y = get_global_id(1);
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local uchar data[32][32];
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local int lc[128];
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for (i = 0; i <= 1; i++) {
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lm_idx.y = -8 + (block_idx.y + i) * 16 + thread_idx.y;
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lm_idx.y = lm_idx.y < 0 ? 0 : lm_idx.y;
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lm_idx.y = lm_idx.y >= height ? height - 1: lm_idx.y;
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for (j = 0; j <= 1; j++) {
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lm_idx.x = -8 + (block_idx.x + j) * 16 + thread_idx.x;
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lm_idx.x = lm_idx.x < 0 ? 0 : lm_idx.x;
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lm_idx.x = lm_idx.x >= width ? width - 1: lm_idx.x;
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data[i*16 + thread_idx.y][j*16 + thread_idx.x] = src[lm_idx.y*width + lm_idx.x];
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}
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}
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local_idx = thread_idx.y*16 + thread_idx.x;
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if (local_idx < 128)
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lc[local_idx] = mask[local_idx];
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barrier(CLK_LOCAL_MEM_FENCE);
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\n#pragma unroll\n
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for (i = -4; i <= 4; i++) {
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lm_idx.y = 8 + i + thread_idx.y;
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\n#pragma unroll\n
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for (j = -4; j <= 4; j++) {
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lm_idx.x = 8 + j + thread_idx.x;
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lc_idx = (i + 4)*8 + j + 4;
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sum += (int)data[lm_idx.y][lm_idx.x] * lc[lc_idx];
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}
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}
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int temp = (int)data[thread_idx.y + 8][thread_idx.x + 8];
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int res = temp + (((temp - (int)((sum + 1<<15) >> 16))) >> 16);
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if (global_idx.x < width && global_idx.y < height)
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dst[global_idx.x + global_idx.y*width] = clip_uint8(res);
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}
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);
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#define OCLCHECK(method, ... ) \
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do { \
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status = method(__VA_ARGS__); \
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if (status != CL_SUCCESS) { \
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av_log(NULL, AV_LOG_ERROR, # method " error '%s'\n", \
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av_opencl_errstr(status)); \
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ret = AVERROR_EXTERNAL; \
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goto end; \
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} \
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} while (0)
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#define CREATEBUF(out, flags, size) \
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do { \
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out = clCreateBuffer(ext_opencl_env->context, flags, size, NULL, &status); \
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if (status != CL_SUCCESS) { \
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av_log(NULL, AV_LOG_ERROR, "Could not create OpenCL buffer\n"); \
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ret = AVERROR_EXTERNAL; \
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goto end; \
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} \
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} while (0)
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static void fill_rand_int(int *data, int n)
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{
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int i;
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srand(av_gettime());
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for (i = 0; i < n; i++)
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data[i] = rand();
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}
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#define OPENCL_NB_ITER 5
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static int64_t run_opencl_bench(AVOpenCLExternalEnv *ext_opencl_env)
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{
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int i, arg = 0, width = 1920, height = 1088;
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int64_t start, ret = 0;
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cl_int status;
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size_t kernel_len;
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char *inbuf;
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int *mask;
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int buf_size = width * height * sizeof(char);
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int mask_size = sizeof(uint32_t) * 128;
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cl_mem cl_mask, cl_inbuf, cl_outbuf;
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cl_kernel kernel = NULL;
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cl_program program = NULL;
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size_t local_work_size_2d[2] = {16, 16};
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size_t global_work_size_2d[2] = {(size_t)width, (size_t)height};
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if (!(inbuf = av_malloc(buf_size)) || !(mask = av_malloc(mask_size))) {
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av_log(NULL, AV_LOG_ERROR, "Out of memory\n");
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ret = AVERROR(ENOMEM);
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goto end;
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}
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fill_rand_int((int*)inbuf, buf_size/4);
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fill_rand_int(mask, mask_size/4);
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CREATEBUF(cl_mask, CL_MEM_READ_ONLY, mask_size);
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CREATEBUF(cl_inbuf, CL_MEM_READ_ONLY, buf_size);
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CREATEBUF(cl_outbuf, CL_MEM_READ_WRITE, buf_size);
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kernel_len = strlen(ocl_bench_source);
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program = clCreateProgramWithSource(ext_opencl_env->context, 1, &ocl_bench_source,
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&kernel_len, &status);
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if (status != CL_SUCCESS || !program) {
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av_log(NULL, AV_LOG_ERROR, "OpenCL unable to create benchmark program\n");
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ret = AVERROR_EXTERNAL;
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goto end;
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}
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status = clBuildProgram(program, 1, &(ext_opencl_env->device_id), NULL, NULL, NULL);
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if (status != CL_SUCCESS) {
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av_log(NULL, AV_LOG_ERROR, "OpenCL unable to build benchmark program\n");
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ret = AVERROR_EXTERNAL;
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goto end;
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}
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kernel = clCreateKernel(program, "unsharp_bench", &status);
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if (status != CL_SUCCESS) {
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av_log(NULL, AV_LOG_ERROR, "OpenCL unable to create benchmark kernel\n");
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ret = AVERROR_EXTERNAL;
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goto end;
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}
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OCLCHECK(clEnqueueWriteBuffer, ext_opencl_env->command_queue, cl_inbuf, CL_TRUE, 0,
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buf_size, inbuf, 0, NULL, NULL);
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OCLCHECK(clEnqueueWriteBuffer, ext_opencl_env->command_queue, cl_mask, CL_TRUE, 0,
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mask_size, mask, 0, NULL, NULL);
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OCLCHECK(clSetKernelArg, kernel, arg++, sizeof(cl_mem), &cl_inbuf);
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OCLCHECK(clSetKernelArg, kernel, arg++, sizeof(cl_mem), &cl_outbuf);
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OCLCHECK(clSetKernelArg, kernel, arg++, sizeof(cl_mem), &cl_mask);
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OCLCHECK(clSetKernelArg, kernel, arg++, sizeof(cl_int), &width);
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OCLCHECK(clSetKernelArg, kernel, arg++, sizeof(cl_int), &height);
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start = av_gettime_relative();
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for (i = 0; i < OPENCL_NB_ITER; i++)
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OCLCHECK(clEnqueueNDRangeKernel, ext_opencl_env->command_queue, kernel, 2, NULL,
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global_work_size_2d, local_work_size_2d, 0, NULL, NULL);
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clFinish(ext_opencl_env->command_queue);
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ret = (av_gettime_relative() - start)/OPENCL_NB_ITER;
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end:
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if (kernel)
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clReleaseKernel(kernel);
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if (program)
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clReleaseProgram(program);
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if (cl_inbuf)
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clReleaseMemObject(cl_inbuf);
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if (cl_outbuf)
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clReleaseMemObject(cl_outbuf);
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if (cl_mask)
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clReleaseMemObject(cl_mask);
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av_free(inbuf);
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av_free(mask);
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return ret;
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}
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static int compare_ocl_device_desc(const void *a, const void *b)
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{
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const OpenCLDeviceBenchmark* va = (const OpenCLDeviceBenchmark*)a;
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const OpenCLDeviceBenchmark* vb = (const OpenCLDeviceBenchmark*)b;
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return FFDIFFSIGN(va->runtime , vb->runtime);
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}
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int opt_opencl_bench(void *optctx, const char *opt, const char *arg)
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{
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int i, j, nb_devices = 0, count = 0;
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int64_t score = 0;
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AVOpenCLDeviceList *device_list;
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AVOpenCLDeviceNode *device_node = NULL;
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OpenCLDeviceBenchmark *devices = NULL;
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cl_platform_id platform;
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av_opencl_get_device_list(&device_list);
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for (i = 0; i < device_list->platform_num; i++)
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nb_devices += device_list->platform_node[i]->device_num;
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if (!nb_devices) {
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av_log(NULL, AV_LOG_ERROR, "No OpenCL device detected!\n");
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return AVERROR(EINVAL);
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}
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if (!(devices = av_malloc_array(nb_devices, sizeof(OpenCLDeviceBenchmark)))) {
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av_log(NULL, AV_LOG_ERROR, "Could not allocate buffer\n");
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return AVERROR(ENOMEM);
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}
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for (i = 0; i < device_list->platform_num; i++) {
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for (j = 0; j < device_list->platform_node[i]->device_num; j++) {
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device_node = device_list->platform_node[i]->device_node[j];
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platform = device_list->platform_node[i]->platform_id;
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score = av_opencl_benchmark(device_node, platform, run_opencl_bench);
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if (score > 0) {
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devices[count].platform_idx = i;
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devices[count].device_idx = j;
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devices[count].runtime = score;
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av_strlcpy(devices[count].device_name, device_node->device_name,
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sizeof(devices[count].device_name));
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count++;
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}
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}
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}
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qsort(devices, count, sizeof(OpenCLDeviceBenchmark), compare_ocl_device_desc);
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fprintf(stderr, "platform_idx\tdevice_idx\tdevice_name\truntime\n");
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for (i = 0; i < count; i++)
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fprintf(stdout, "%d\t%d\t%s\t%"PRId64"\n",
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devices[i].platform_idx, devices[i].device_idx,
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devices[i].device_name, devices[i].runtime);
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av_opencl_free_device_list(&device_list);
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av_free(devices);
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return 0;
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}
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int opt_opencl(void *optctx, const char *opt, const char *arg)
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{
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char *key, *value;
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const char *opts = arg;
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int ret = 0;
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while (*opts) {
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ret = av_opt_get_key_value(&opts, "=", ":", 0, &key, &value);
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if (ret < 0)
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return ret;
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ret = av_opencl_set_option(key, value);
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if (ret < 0)
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return ret;
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if (*opts)
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opts++;
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}
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return ret;
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}
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