git.sesse.net Git - narabu/blob - narabu-encoder.cpp

   1 #include <stdio.h>
   2 #include <stdint.h>
   3 #include <stdlib.h>
   4 #include <string.h>
   5 #include <assert.h>
   6 #include <math.h>
   7 #include <SDL2/SDL.h>
   8 #include <SDL2/SDL_error.h>
   9 #include <SDL2/SDL_video.h>
  10 #include <epoxy/gl.h>
  11
  12 #include <algorithm>
  13 #include <chrono>
  14 #include <memory>
  15 #include <numeric>
  16 #include <random>
  17 #include <vector>
  18 #include <unordered_map>
  19
  20 #include <movit/util.h>
  21
  22 #include "util.h"
  23
  24 #define WIDTH 1280
  25 #define HEIGHT 720
  26 #define WIDTH_BLOCKS (WIDTH/8)
  27 #define WIDTH_BLOCKS_CHROMA (WIDTH/16)
  28 #define HEIGHT_BLOCKS (HEIGHT/8)
  29 #define NUM_BLOCKS (WIDTH_BLOCKS * HEIGHT_BLOCKS)
  30 #define NUM_BLOCKS_CHROMA (WIDTH_BLOCKS_CHROMA * HEIGHT_BLOCKS)
  31
  32 #define NUM_SYMS 256
  33 #define ESCAPE_LIMIT (NUM_SYMS - 1)
  34 #define BLOCKS_PER_STREAM 320
  35
  36 static constexpr uint32_t prob_bits = 12;
  37 static constexpr uint32_t prob_scale = 1 << prob_bits;
  38
  39 unsigned char rgb[WIDTH * HEIGHT * 3];
  40 unsigned char pix_y[WIDTH * HEIGHT];
  41 unsigned char pix_cb[(WIDTH/2) * HEIGHT];
  42 unsigned char pix_cr[(WIDTH/2) * HEIGHT];
  43
  44 struct RansDistSSBO {
  45         unsigned dist[4 * 256];
  46         unsigned ransfreq[4 * 256];
  47         struct {
  48                 uint32_t x_max, rcp_freq, bias, rcp_shift_and_cmpl_freq;
  49         } ransdist[4 * 256];
  50         unsigned sign_biases[4];
  51 };
  52
  53 using namespace std;
  54 using namespace std::chrono;
  55
  56 void write_varint(int x, FILE *fp)
  57 {
  58         while (x >= 128) {
  59                 putc((x & 0x7f) | 0x80, fp);
  60                 x >>= 7;
  61         }
  62         putc(x, fp);
  63 }
  64
  65 void readpix(unsigned char *ptr, const char *filename)
  66 {
  67         FILE *fp = fopen(filename, "rb");
  68         if (fp == nullptr) {
  69                 perror(filename);
  70                 exit(1);
  71         }
  72
  73         fseek(fp, 0, SEEK_END);
  74         long len = ftell(fp);
  75         assert(len >= WIDTH * HEIGHT * 3);
  76         fseek(fp, len - WIDTH * HEIGHT * 3, SEEK_SET);
  77
  78         fread(ptr, 1, WIDTH * HEIGHT * 3, fp);
  79         fclose(fp);
  80 }
  81
  82 // Should be done on the GPU, of course, but irrelevant for the demonstration.
  83 void convert_ycbcr()
  84 {
  85         double coeff[3] = { 0.2126, 0.7152, 0.0722 };  // sum = 1.0
  86         double cb_fac = 1.0 / (coeff[0] + coeff[1] + 1.0f - coeff[2]);  // 0.539
  87         double cr_fac = 1.0 / (1.0f - coeff[0] + coeff[1] + coeff[2]);  // 0.635
  88
  89         unique_ptr<float[]> temp_cb(new float[WIDTH * HEIGHT]);
  90         unique_ptr<float[]> temp_cr(new float[WIDTH * HEIGHT]);
  91         for (unsigned yb = 0; yb < HEIGHT; ++yb) {
  92                 for (unsigned xb = 0; xb < WIDTH; ++xb) {
  93                         int r = rgb[((yb * WIDTH) + xb) * 3 + 0];
  94                         int g = rgb[((yb * WIDTH) + xb) * 3 + 1];
  95                         int b = rgb[((yb * WIDTH) + xb) * 3 + 2];
  96                         double y = std::min(std::max(coeff[0] * r + coeff[1] * g + coeff[2] * b, 0.0), 255.0);
  97                         double cb = (b - y) * cb_fac + 128.0;
  98                         double cr = (r - y) * cr_fac + 128.0;
  99                         pix_y[(yb * WIDTH) + xb] = lrint(y);
 100                         temp_cb[(yb * WIDTH) + xb] = cb;
 101                         temp_cr[(yb * WIDTH) + xb] = cr;
 102                 }
 103         }
 104
 105         // Simple 4:2:2 subsampling with left convention.
 106         for (unsigned yb = 0; yb < HEIGHT; ++yb) {
 107                 for (unsigned xb = 0; xb < WIDTH / 2; ++xb) {
 108                         int c0 = yb * WIDTH + std::max(int(xb) * 2 - 1, 0);
 109                         int c1 = yb * WIDTH + xb * 2;
 110                         int c2 = yb * WIDTH + xb * 2 + 1;
 111
 112                         double cb = 0.25 * temp_cb[c0] + 0.5 * temp_cb[c1] + 0.25 * temp_cb[c2];
 113                         double cr = 0.25 * temp_cr[c0] + 0.5 * temp_cr[c1] + 0.25 * temp_cr[c2];
 114                         cb = std::min(std::max(cb, 0.0), 255.0);
 115                         cr = std::min(std::max(cr, 0.0), 255.0);
 116                         pix_cb[(yb * WIDTH/2) + xb] = lrint(cb);
 117                         pix_cr[(yb * WIDTH/2) + xb] = lrint(cr);
 118                 }
 119         }
 120 }
 121
 122 int main(int argc, char **argv)
 123 {
 124         // Set up an OpenGL context using SDL.
 125         if (SDL_Init(SDL_INIT_VIDEO) == -1) {
 126                 fprintf(stderr, "SDL_Init failed: %s\n", SDL_GetError());
 127                 exit(1);
 128         }
 129         SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 0);
 130         SDL_GL_SetAttribute(SDL_GL_STENCIL_SIZE, 0);
 131         SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
 132         SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
 133         SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 4);
 134         SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 5);
 135
 136         SDL_Window *window = SDL_CreateWindow("OpenGL window for unit test",
 137                 SDL_WINDOWPOS_UNDEFINED,
 138                 SDL_WINDOWPOS_UNDEFINED,
 139                 32, 32,
 140                 SDL_WINDOW_OPENGL);
 141         SDL_GLContext context = SDL_GL_CreateContext(window);
 142         assert(context != nullptr);
 143
 144         if (argc >= 2)
 145                 readpix(rgb, argv[1]);
 146         else
 147                 readpix(rgb, "color.pnm");
 148         convert_ycbcr();
 149
 150         // Compile the DCT shader.
 151         string shader_src = ::read_file("encoder.shader");
 152         GLuint shader_num = compile_shader(shader_src, GL_COMPUTE_SHADER);
 153         GLuint glsl_program_num = glCreateProgram();
 154         glAttachShader(glsl_program_num, shader_num);
 155         glLinkProgram(glsl_program_num);
 156
 157         GLint success;
 158         glGetProgramiv(glsl_program_num, GL_LINK_STATUS, &success);
 159         if (success == GL_FALSE) {
 160                 GLchar error_log[1024] = {0};
 161                 glGetProgramInfoLog(glsl_program_num, 1024, nullptr, error_log);
 162                 fprintf(stderr, "Error linking program: %s\n", error_log);
 163                 exit(1);
 164         }
 165
 166         // Compile the tally shader.
 167         shader_src = ::read_file("tally.shader");
 168         shader_num = compile_shader(shader_src, GL_COMPUTE_SHADER);
 169         GLuint glsl_tally_program_num = glCreateProgram();
 170         glAttachShader(glsl_tally_program_num, shader_num);
 171         glLinkProgram(glsl_tally_program_num);
 172
 173         glGetProgramiv(glsl_tally_program_num, GL_LINK_STATUS, &success);
 174         if (success == GL_FALSE) {
 175                 GLchar error_log[1024] = {0};
 176                 glGetProgramInfoLog(glsl_tally_program_num, 1024, nullptr, error_log);
 177                 fprintf(stderr, "Error linking program: %s\n", error_log);
 178                 exit(1);
 179         }
 180
 181         // Compile the rANS shader.
 182         shader_src = ::read_file("rans.shader");
 183         shader_num = compile_shader(shader_src, GL_COMPUTE_SHADER);
 184         GLuint glsl_rans_program_num = glCreateProgram();
 185         glAttachShader(glsl_rans_program_num, shader_num);
 186         glLinkProgram(glsl_rans_program_num);
 187
 188         glGetProgramiv(glsl_rans_program_num, GL_LINK_STATUS, &success);
 189         if (success == GL_FALSE) {
 190                 GLchar error_log[1024] = {0};
 191                 glGetProgramInfoLog(glsl_rans_program_num, 1024, nullptr, error_log);
 192                 fprintf(stderr, "Error linking program: %s\n", error_log);
 193                 exit(1);
 194         }
 195         check_error();
 196
 197         // An SSBO for the rANS distributions.
 198         GLuint ssbo;
 199         glGenBuffers(1, &ssbo);
 200         glBindBuffer(GL_SHADER_STORAGE_BUFFER, ssbo);
 201         glNamedBufferStorage(ssbo, sizeof(RansDistSSBO), nullptr, GL_MAP_READ_BIT | GL_MAP_PERSISTENT_BIT);
 202         check_error();
 203
 204         // SSBOs for the rANS output (data and offsets).
 205         GLuint output_ssbo;
 206         glGenBuffers(1, &output_ssbo);
 207         glBindBuffer(GL_SHADER_STORAGE_BUFFER, output_ssbo);
 208         glNamedBufferStorage(output_ssbo, 45 * 64 * 1024, nullptr, GL_MAP_READ_BIT | GL_MAP_PERSISTENT_BIT);
 209         check_error();
 210
 211         GLuint output_offset_ssbo;
 212         glGenBuffers(1, &output_offset_ssbo);
 213         glBindBuffer(GL_SHADER_STORAGE_BUFFER, output_offset_ssbo);
 214         glNamedBufferStorage(output_offset_ssbo, 45 * 64 * sizeof(uint32_t), nullptr, GL_MAP_READ_BIT | GL_MAP_PERSISTENT_BIT);
 215         check_error();
 216
 217         // Bind SSBOs.
 218         glUseProgram(glsl_program_num);
 219         glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 9, ssbo);
 220
 221         glUseProgram(glsl_tally_program_num);
 222         glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 9, ssbo);
 223
 224         glUseProgram(glsl_rans_program_num);
 225         glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 9, ssbo);
 226         glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 10, output_ssbo);
 227         glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 11, output_offset_ssbo);
 228
 229         glUseProgram(glsl_program_num);
 230         check_error();
 231
 232         // Upload luma.
 233         GLuint y_tex;
 234         glGenTextures(1, &y_tex);
 235         glBindTexture(GL_TEXTURE_2D, y_tex);
 236         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 237         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 238         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
 239         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
 240         glTexImage2D(GL_TEXTURE_2D, 0, GL_R8UI, WIDTH, HEIGHT, 0, GL_RED_INTEGER, GL_UNSIGNED_BYTE, pix_y);
 241         check_error();
 242
 243         // Make destination textures.
 244         GLuint dc_ac7_tex, ac1_ac6_tex, ac2_ac5_tex;
 245         for (GLuint *tex : { &dc_ac7_tex, &ac1_ac6_tex, &ac2_ac5_tex }) {
 246                 glGenTextures(1, tex);
 247                 glBindTexture(GL_TEXTURE_2D, *tex);
 248                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 249                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 250                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
 251                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
 252                 glTexImage2D(GL_TEXTURE_2D, 0, GL_R16UI, WIDTH / 8, HEIGHT, 0, GL_RED_INTEGER, GL_UNSIGNED_SHORT, nullptr);
 253                 check_error();
 254         }
 255
 256         GLuint ac3_tex, ac4_tex;
 257         for (GLuint *tex : { &ac3_tex, &ac4_tex }) {
 258                 glGenTextures(1, tex);
 259                 glBindTexture(GL_TEXTURE_2D, *tex);
 260                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 261                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 262                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
 263                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
 264                 glTexImage2D(GL_TEXTURE_2D, 0, GL_R8I, WIDTH / 8, HEIGHT, 0, GL_RED_INTEGER, GL_BYTE, nullptr);
 265                 check_error();
 266         }
 267
 268         glBindImageTexture(0, dc_ac7_tex, 0, GL_FALSE, 0, GL_READ_WRITE, GL_R16UI);
 269         glBindImageTexture(1, ac1_ac6_tex, 0, GL_FALSE, 0, GL_READ_WRITE, GL_R16UI);
 270         glBindImageTexture(2, ac2_ac5_tex, 0, GL_FALSE, 0, GL_READ_WRITE, GL_R16UI);
 271         glBindImageTexture(3, ac3_tex, 0, GL_FALSE, 0, GL_READ_WRITE, GL_R8I);
 272         glBindImageTexture(4, ac4_tex, 0, GL_FALSE, 0, GL_READ_WRITE, GL_R8I);
 273         glBindImageTexture(5, y_tex, 0, GL_FALSE, 0, GL_READ_ONLY, GL_R8UI);
 274         check_error();
 275
 276         // Bind uniforms.
 277         glUseProgram(glsl_program_num);
 278         GLint dc_ac7_tex_uniform = glGetUniformLocation(glsl_program_num, "dc_ac7_tex");
 279         GLint ac1_ac6_tex_uniform = glGetUniformLocation(glsl_program_num, "ac1_ac6_tex");
 280         GLint ac2_ac5_tex_uniform = glGetUniformLocation(glsl_program_num, "ac2_ac5_tex");
 281         GLint ac3_tex_uniform = glGetUniformLocation(glsl_program_num, "ac3_tex");
 282         GLint ac4_tex_uniform = glGetUniformLocation(glsl_program_num, "ac4_tex");
 283         GLint image_tex_uniform = glGetUniformLocation(glsl_program_num, "image_tex");
 284         glUniform1i(dc_ac7_tex_uniform, 0);
 285         glUniform1i(ac1_ac6_tex_uniform, 1);
 286         glUniform1i(ac2_ac5_tex_uniform, 2);
 287         glUniform1i(ac3_tex_uniform, 3);
 288         glUniform1i(ac4_tex_uniform, 4);
 289         glUniform1i(image_tex_uniform, 5);
 290
 291         glUseProgram(glsl_rans_program_num);
 292         dc_ac7_tex_uniform = glGetUniformLocation(glsl_rans_program_num, "dc_ac7_tex");
 293         ac1_ac6_tex_uniform = glGetUniformLocation(glsl_rans_program_num, "ac1_ac6_tex");
 294         ac2_ac5_tex_uniform = glGetUniformLocation(glsl_rans_program_num, "ac2_ac5_tex");
 295         ac3_tex_uniform = glGetUniformLocation(glsl_rans_program_num, "ac3_tex");
 296         ac4_tex_uniform = glGetUniformLocation(glsl_rans_program_num, "ac4_tex");
 297         image_tex_uniform = glGetUniformLocation(glsl_rans_program_num, "image_tex");
 298         glUniform1i(dc_ac7_tex_uniform, 0);
 299         glUniform1i(ac1_ac6_tex_uniform, 1);
 300         glUniform1i(ac2_ac5_tex_uniform, 2);
 301         glUniform1i(ac3_tex_uniform, 3);
 302         glUniform1i(ac4_tex_uniform, 4);
 303
 304         steady_clock::time_point start = steady_clock::now();
 305         unsigned num_iterations = 100;
 306         for (unsigned i = 0; i < num_iterations; ++i) {
 307                 glClearNamedBufferSubData(ssbo, GL_R8, 0, sizeof(RansDistSSBO), GL_RED, GL_UNSIGNED_BYTE, nullptr);
 308                 glUseProgram(glsl_program_num);
 309                 glDispatchCompute(WIDTH_BLOCKS / 16, HEIGHT_BLOCKS, 1);
 310                 glMemoryBarrier(GL_SHADER_STORAGE_BARRIER_BIT);
 311
 312                 glUseProgram(glsl_tally_program_num);
 313                 glDispatchCompute(4, 1, 1);
 314                 glMemoryBarrier(GL_SHADER_STORAGE_BARRIER_BIT);
 315
 316                 glUseProgram(glsl_rans_program_num);
 317                 glDispatchCompute(NUM_BLOCKS / BLOCKS_PER_STREAM, 8, 5);
 318         }
 319         check_error();
 320         glFinish();
 321         check_error();
 322         steady_clock::time_point now = steady_clock::now();
 323
 324 #if 0
 325         printf("%ld bytes + %ld escape bits (%ld) = %ld total bytes\n",
 326                 tot_bytes - extra_bits / 8,
 327                 extra_bits,
 328                 extra_bits / 8,
 329                 tot_bytes);
 330
 331         printf("\n");
 332 #endif
 333
 334         printf("Each iteration took %.3f ms.\n", 1e3 * duration<double>(now - start).count() / num_iterations);
 335
 336         FILE *codedfp = fopen("coded.dat", "wb");
 337         if (codedfp == nullptr) {
 338                 perror("coded.dat");
 339                 exit(1);
 340         }
 341
 342         // Write out the distributions.
 343         const RansDistSSBO *rans_dist = (const RansDistSSBO *)glMapNamedBufferRange(ssbo, 0, sizeof(RansDistSSBO), GL_MAP_READ_BIT | GL_MAP_PERSISTENT_BIT);
 344         for (unsigned r = 0; r < 2; ++r) {  // Hack to write fake chroma tables.
 345                 // TODO: rather gamma-k or something
 346                 for (unsigned i = 0; i < 4; ++i) {
 347                         printf("writing table %d\n", i);
 348                         for (unsigned j = 0; j < NUM_SYMS; ++j) {
 349                                 printf("%d,%d: freq=%d  x_max=%d, rcp_freq=%08x, bias=%d, rcp_shift=%d, cmpl_freq=%d\n",
 350                                         i, j, rans_dist->ransfreq[i * 256 + j],
 351                                         rans_dist->ransdist[i * 256 + j].x_max,
 352                                         rans_dist->ransdist[i * 256 + j].rcp_freq,
 353                                         rans_dist->ransdist[i * 256 + j].bias,
 354                                         rans_dist->ransdist[i * 256 + j].rcp_shift_and_cmpl_freq & 0xffff,
 355                                         rans_dist->ransdist[i * 256 + j].rcp_shift_and_cmpl_freq >> 16);
 356                                 write_varint(rans_dist->ransfreq[i * 256 + j], codedfp);
 357                         }
 358                 }
 359         }
 360
 361         // Write out the actual data.
 362         // TODO: Do the deduplication.
 363
 364         const uint32_t *offsets = (const uint32_t *)glMapNamedBufferRange(output_offset_ssbo, 0, 45 * 64 * sizeof(uint32_t), GL_MAP_READ_BIT | GL_MAP_PERSISTENT_BIT);
 365 #if 0
 366         for (int i = 0; i < 45*64; ++i) {
 367                 printf("%d,%d,%d: %u\n", i / 64, (i / 8) % 8, i % 8, 1024 * (i + 1) - offsets[i]);
 368         }
 369 #endif
 370
 371         const uint8_t *data = (const uint8_t *)glMapNamedBufferRange(output_ssbo, 0, 45 * 64 * 1024, GL_MAP_READ_BIT | GL_MAP_PERSISTENT_BIT);
 372
 373         for (unsigned y = 0; y < 8; ++y) {
 374                 for (unsigned x = 0; x < 8; ++x) {
 375                         for (unsigned int stream_idx = 0; stream_idx < 45; ++stream_idx) {
 376                                 const uint8_t *out_end = data + (stream_idx * 64 + y * 8 + x + 1) * 1024;
 377                                 const uint8_t *ptr = data + offsets[stream_idx * 64 + y * 8 + x];
 378                                 uint32_t num_rans_bytes = out_end - ptr;
 379 #if 0
 380                                 if (num_rans_bytes == last_block.size() &&
 381                                     memcmp(last_block.data(), ptr, last_block.size()) == 0) {
 382                                         write_varint(0, codedfp);
 383                                         clear();
 384                                         return 1;
 385                                 } else {
 386                                         last_block = string((const char *)ptr, num_rans_bytes);
 387                                 }
 388 #endif
 389
 390                                 write_varint(num_rans_bytes, codedfp);
 391                                 fwrite(ptr, 1, num_rans_bytes, codedfp);
 392                         }
 393                 }
 394         }
 395         fclose(codedfp);
 396 }