X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=narabu-encoder.cpp;fp=narabu-encoder.cpp;h=9e9f0ab8c036904717a79a5a2a6decfec07a3934;hb=8f24287e70cc50f30a1b4b2718b4bf362455517b;hp=0000000000000000000000000000000000000000;hpb=056ba403e3ee3b9a362ac85196d4bcce6a73d98c;p=narabu diff --git a/narabu-encoder.cpp b/narabu-encoder.cpp new file mode 100644 index 0000000..9e9f0ab --- /dev/null +++ b/narabu-encoder.cpp @@ -0,0 +1,569 @@ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include +#include + +#include + +#include "ryg_rans/rans_byte.h" +#include "ryg_rans/renormalize.h" +#include "util.h" + +#define WIDTH 1280 +#define HEIGHT 720 +#define WIDTH_BLOCKS (WIDTH/8) +#define WIDTH_BLOCKS_CHROMA (WIDTH/16) +#define HEIGHT_BLOCKS (HEIGHT/8) +#define NUM_BLOCKS (WIDTH_BLOCKS * HEIGHT_BLOCKS) +#define NUM_BLOCKS_CHROMA (WIDTH_BLOCKS_CHROMA * HEIGHT_BLOCKS) + +#define NUM_SYMS 256 +#define ESCAPE_LIMIT (NUM_SYMS - 1) +#define BLOCKS_PER_STREAM 320 + +static constexpr uint32_t prob_bits = 12; +static constexpr uint32_t prob_scale = 1 << prob_bits; + +unsigned char rgb[WIDTH * HEIGHT * 3]; +unsigned char pix_y[WIDTH * HEIGHT]; +unsigned char pix_cb[(WIDTH/2) * HEIGHT]; +unsigned char pix_cr[(WIDTH/2) * HEIGHT]; + +using namespace std; +using namespace std::chrono; + +void write_varint(int x, FILE *fp) +{ + while (x >= 128) { + putc((x & 0x7f) | 0x80, fp); + x >>= 7; + } + putc(x, fp); +} + +void readpix(unsigned char *ptr, const char *filename) +{ + FILE *fp = fopen(filename, "rb"); + if (fp == nullptr) { + perror(filename); + exit(1); + } + + fseek(fp, 0, SEEK_END); + long len = ftell(fp); + assert(len >= WIDTH * HEIGHT * 3); + fseek(fp, len - WIDTH * HEIGHT * 3, SEEK_SET); + + fread(ptr, 1, WIDTH * HEIGHT * 3, fp); + fclose(fp); +} + +struct SymbolStats +{ + uint32_t freqs[NUM_SYMS]; + uint32_t cum_freqs[NUM_SYMS + 1]; + + void clear(); + void calc_cum_freqs(); + void normalize_freqs(uint32_t target_total); +}; + +void SymbolStats::clear() +{ + for (int i=0; i < NUM_SYMS; i++) + freqs[i] = 0; +} + +void SymbolStats::calc_cum_freqs() +{ + cum_freqs[0] = 0; + for (int i=0; i < NUM_SYMS; i++) + cum_freqs[i+1] = cum_freqs[i] + freqs[i]; +} + +void SymbolStats::normalize_freqs(uint32_t target_total) +{ + uint64_t real_freq[NUM_SYMS + 1]; // hack + + assert(target_total >= NUM_SYMS); + + calc_cum_freqs(); + uint32_t cur_total = cum_freqs[NUM_SYMS]; + + if (cur_total == 0) return; + + double ideal_cost = 0.0; + for (int i = 1; i <= NUM_SYMS; i++) + { + real_freq[i] = cum_freqs[i] - cum_freqs[i - 1]; + if (real_freq[i] > 0) + ideal_cost -= real_freq[i] * log2(real_freq[i] / double(cur_total)); + } + + OptimalRenormalize(cum_freqs, NUM_SYMS, prob_scale); + + // calculate updated freqs and make sure we didn't screw anything up + assert(cum_freqs[0] == 0 && cum_freqs[NUM_SYMS] == target_total); + for (int i=0; i < NUM_SYMS; i++) { + if (freqs[i] == 0) + assert(cum_freqs[i+1] == cum_freqs[i]); + else + assert(cum_freqs[i+1] > cum_freqs[i]); + + // calc updated freq + freqs[i] = cum_freqs[i+1] - cum_freqs[i]; + } + + double calc_cost = 0.0; + for (int i = 1; i <= NUM_SYMS; i++) + { + uint64_t freq = cum_freqs[i] - cum_freqs[i - 1]; + if (real_freq[i] > 0) + calc_cost -= real_freq[i] * log2(freq / double(target_total)); + } + + static double total_loss = 0.0; + total_loss += calc_cost - ideal_cost; + static double total_loss_with_dp = 0.0; + double optimal_cost = 0.0; + //total_loss_with_dp += optimal_cost - ideal_cost; + printf("ideal cost = %.0f bits, DP cost = %.0f bits, calc cost = %.0f bits (loss = %.2f bytes, total loss = %.2f bytes, total loss with DP = %.2f bytes)\n", + ideal_cost, optimal_cost, + calc_cost, (calc_cost - ideal_cost) / 8.0, total_loss / 8.0, total_loss_with_dp / 8.0); +} + +SymbolStats stats[128]; + +const int luma_mapping[64] = { + 0, 0, 1, 1, 2, 2, 3, 3, + 0, 0, 1, 2, 2, 2, 3, 3, + 1, 1, 2, 2, 2, 3, 3, 3, + 1, 1, 2, 2, 2, 3, 3, 3, + 1, 2, 2, 2, 2, 3, 3, 3, + 2, 2, 2, 2, 3, 3, 3, 3, + 2, 2, 3, 3, 3, 3, 3, 3, + 3, 3, 3, 3, 3, 3, 3, 3, +}; + +int pick_stats_for(int x, int y) +{ + return luma_mapping[y * 8 + x]; +} + +class RansEncoder { +public: + RansEncoder() + { + out_buf.reset(new uint8_t[out_max_size]); + clear(); + } + + void init_prob(SymbolStats &s) + { + for (int i = 0; i < NUM_SYMS; i++) { + //printf("%d: cumfreqs=%d freqs=%d prob_bits=%d\n", i, s.cum_freqs[i], s.freqs[i], prob_bits + 1); + RansEncSymbolInit(&esyms[i], s.cum_freqs[i], s.freqs[i], prob_bits + 1); + } + sign_bias = s.cum_freqs[NUM_SYMS]; + } + + void clear() + { + out_end = out_buf.get() + out_max_size; + ptr = out_end; // *end* of output buffer + RansEncInit(&rans); + } + + uint32_t save_block(FILE *codedfp) // Returns number of bytes. + { + RansEncFlush(&rans, &ptr); + //printf("post-flush = %08x\n", rans); + + uint32_t num_rans_bytes = out_end - ptr; + if (num_rans_bytes == last_block.size() && + memcmp(last_block.data(), ptr, last_block.size()) == 0) { + write_varint(0, codedfp); + clear(); + return 1; + } else { + last_block = string((const char *)ptr, num_rans_bytes); + } + + write_varint(num_rans_bytes, codedfp); + //fwrite(&num_rans_bytes, 1, 4, codedfp); + fwrite(ptr, 1, num_rans_bytes, codedfp); + + //printf("first rANS bytes: %02x %02x %02x %02x %02x %02x %02x %02x\n", ptr[0], ptr[1], ptr[2], ptr[3], ptr[4], ptr[5], ptr[6], ptr[7]); + + + clear(); + + //printf("Saving block: %d rANS bytes\n", num_rans_bytes); + return num_rans_bytes; + //return num_rans_bytes; + } + + void encode_coeff(short signed_k) + { + //printf("encoding coeff %d (sym %d), rans before encoding = %08x\n", signed_k, ((abs(signed_k) - 1) & 255), rans); + unsigned short k = abs(signed_k); + if (k >= ESCAPE_LIMIT) { + // Put the coefficient as a 1/(2^12) symbol _before_ + // the 255 coefficient, since the decoder will read the + // 255 coefficient first. + RansEncPut(&rans, &ptr, k, 1, prob_bits); + k = ESCAPE_LIMIT; + } + RansEncPutSymbol(&rans, &ptr, &esyms[(k - 1) & (NUM_SYMS - 1)]); + if (signed_k < 0) { + rans += sign_bias; + } + } + +private: + static constexpr size_t out_max_size = 32 << 20; // 32 MB. + static constexpr size_t max_num_sign = 1048576; // Way too big. And actually bytes. + + unique_ptr out_buf; + uint8_t *out_end; + uint8_t *ptr; + RansState rans; + RansEncSymbol esyms[NUM_SYMS]; + uint32_t sign_bias; + + std::string last_block; +}; + +// Should be done on the GPU, of course, but irrelevant for the demonstration. +void convert_ycbcr() +{ + double coeff[3] = { 0.2126, 0.7152, 0.0722 }; // sum = 1.0 + double cb_fac = 1.0 / (coeff[0] + coeff[1] + 1.0f - coeff[2]); // 0.539 + double cr_fac = 1.0 / (1.0f - coeff[0] + coeff[1] + coeff[2]); // 0.635 + + unique_ptr temp_cb(new float[WIDTH * HEIGHT]); + unique_ptr temp_cr(new float[WIDTH * HEIGHT]); + for (unsigned yb = 0; yb < HEIGHT; ++yb) { + for (unsigned xb = 0; xb < WIDTH; ++xb) { + int r = rgb[((yb * WIDTH) + xb) * 3 + 0]; + int g = rgb[((yb * WIDTH) + xb) * 3 + 1]; + int b = rgb[((yb * WIDTH) + xb) * 3 + 2]; + double y = std::min(std::max(coeff[0] * r + coeff[1] * g + coeff[2] * b, 0.0), 255.0); + double cb = (b - y) * cb_fac + 128.0; + double cr = (r - y) * cr_fac + 128.0; + pix_y[(yb * WIDTH) + xb] = lrint(y); + temp_cb[(yb * WIDTH) + xb] = cb; + temp_cr[(yb * WIDTH) + xb] = cr; + } + } + + // Simple 4:2:2 subsampling with left convention. + for (unsigned yb = 0; yb < HEIGHT; ++yb) { + for (unsigned xb = 0; xb < WIDTH / 2; ++xb) { + int c0 = yb * WIDTH + std::max(int(xb) * 2 - 1, 0); + int c1 = yb * WIDTH + xb * 2; + int c2 = yb * WIDTH + xb * 2 + 1; + + double cb = 0.25 * temp_cb[c0] + 0.5 * temp_cb[c1] + 0.25 * temp_cb[c2]; + double cr = 0.25 * temp_cr[c0] + 0.5 * temp_cr[c1] + 0.25 * temp_cr[c2]; + cb = std::min(std::max(cb, 0.0), 255.0); + cr = std::min(std::max(cr, 0.0), 255.0); + pix_cb[(yb * WIDTH/2) + xb] = lrint(cb); + pix_cr[(yb * WIDTH/2) + xb] = lrint(cr); + } + } +} + +int main(int argc, char **argv) +{ + // Set up an OpenGL context using SDL. + if (SDL_Init(SDL_INIT_VIDEO) == -1) { + fprintf(stderr, "SDL_Init failed: %s\n", SDL_GetError()); + exit(1); + } + SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 0); + SDL_GL_SetAttribute(SDL_GL_STENCIL_SIZE, 0); + SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1); + SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE); + SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 4); + SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 5); + + SDL_Window *window = SDL_CreateWindow("OpenGL window for unit test", + SDL_WINDOWPOS_UNDEFINED, + SDL_WINDOWPOS_UNDEFINED, + 32, 32, + SDL_WINDOW_OPENGL); + SDL_GLContext context = SDL_GL_CreateContext(window); + assert(context != nullptr); + + if (argc >= 2) + readpix(rgb, argv[1]); + else + readpix(rgb, "color.pnm"); + convert_ycbcr(); + + // Compile the shader. + string shader_src = ::read_file("encoder.shader"); + GLuint shader_num = compile_shader(shader_src, GL_COMPUTE_SHADER); + GLuint glsl_program_num = glCreateProgram(); + glAttachShader(glsl_program_num, shader_num); + glLinkProgram(glsl_program_num); + + GLint success; + glGetProgramiv(glsl_program_num, GL_LINK_STATUS, &success); + if (success == GL_FALSE) { + GLchar error_log[1024] = {0}; + glGetProgramInfoLog(glsl_program_num, 1024, nullptr, error_log); + fprintf(stderr, "Error linking program: %s\n", error_log); + exit(1); + } + + glUseProgram(glsl_program_num); + + // Upload luma. + GLuint y_tex; + glGenTextures(1, &y_tex); + glBindTexture(GL_TEXTURE_2D, y_tex); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT); + glTexImage2D(GL_TEXTURE_2D, 0, GL_R8I, WIDTH, HEIGHT, 0, GL_RED_INTEGER, GL_UNSIGNED_BYTE, pix_y); + check_error(); + + // Make destination textures. + GLuint dc_ac7_tex, ac1_ac6_tex, ac2_ac5_tex; + for (GLuint *tex : { &dc_ac7_tex, &ac1_ac6_tex, &ac2_ac5_tex }) { + glGenTextures(1, tex); + glBindTexture(GL_TEXTURE_2D, *tex); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT); + glTexImage2D(GL_TEXTURE_2D, 0, GL_R16UI, WIDTH / 8, HEIGHT, 0, GL_RED_INTEGER, GL_UNSIGNED_SHORT, nullptr); + check_error(); + } + + GLuint ac3_tex, ac4_tex; + for (GLuint *tex : { &ac3_tex, &ac4_tex }) { + glGenTextures(1, tex); + glBindTexture(GL_TEXTURE_2D, *tex); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT); + glTexImage2D(GL_TEXTURE_2D, 0, GL_R8I, WIDTH / 8, HEIGHT, 0, GL_RED_INTEGER, GL_BYTE, nullptr); + check_error(); + } + + GLint dc_ac7_tex_uniform = glGetUniformLocation(glsl_program_num, "dc_ac7_tex"); + GLint ac1_ac6_tex_uniform = glGetUniformLocation(glsl_program_num, "ac1_ac6_tex"); + GLint ac2_ac5_tex_uniform = glGetUniformLocation(glsl_program_num, "ac2_ac5_tex"); + GLint ac3_tex_uniform = glGetUniformLocation(glsl_program_num, "ac3_tex"); + GLint ac4_tex_uniform = glGetUniformLocation(glsl_program_num, "ac4_tex"); + GLint image_tex_uniform = glGetUniformLocation(glsl_program_num, "image_tex"); + + glUniform1i(dc_ac7_tex_uniform, 0); + glUniform1i(ac1_ac6_tex_uniform, 1); + glUniform1i(ac2_ac5_tex_uniform, 2); + glUniform1i(ac3_tex_uniform, 3); + glUniform1i(ac4_tex_uniform, 4); + glUniform1i(image_tex_uniform, 5); + glBindImageTexture(0, dc_ac7_tex, 0, GL_FALSE, 0, GL_WRITE_ONLY, GL_R16UI); + glBindImageTexture(1, ac1_ac6_tex, 0, GL_FALSE, 0, GL_WRITE_ONLY, GL_R16UI); + glBindImageTexture(2, ac2_ac5_tex, 0, GL_FALSE, 0, GL_WRITE_ONLY, GL_R16UI); + glBindImageTexture(3, ac3_tex, 0, GL_FALSE, 0, GL_WRITE_ONLY, GL_R8I); + glBindImageTexture(4, ac4_tex, 0, GL_FALSE, 0, GL_WRITE_ONLY, GL_R8I); + glBindImageTexture(5, y_tex, 0, GL_FALSE, 0, GL_READ_ONLY, GL_R8I); + check_error(); + + steady_clock::time_point start = steady_clock::now(); + unsigned num_iterations = 1000; + for (unsigned i = 0; i < num_iterations; ++i) { + glDispatchCompute(WIDTH_BLOCKS, HEIGHT_BLOCKS, 1); + } + check_error(); + glFinish(); + steady_clock::time_point now = steady_clock::now(); + + // CPU part starts here -- will be GPU later. + // We only do luma for now. + + int16_t *coeff_y = new int16_t[WIDTH * HEIGHT]; + + glBindTexture(GL_TEXTURE_2D, dc_ac7_tex); + uint16_t *dc_ac7_data = new uint16_t[(WIDTH/8) * HEIGHT]; + glGetTexImage(GL_TEXTURE_2D, 0, GL_RED_INTEGER, GL_UNSIGNED_SHORT, dc_ac7_data); + check_error(); + + glBindTexture(GL_TEXTURE_2D, ac1_ac6_tex); + uint16_t *ac1_ac6_data = new uint16_t[(WIDTH/8) * HEIGHT]; + glGetTexImage(GL_TEXTURE_2D, 0, GL_RED_INTEGER, GL_UNSIGNED_SHORT, ac1_ac6_data); + check_error(); + + glBindTexture(GL_TEXTURE_2D, ac2_ac5_tex); + uint16_t *ac2_ac5_data = new uint16_t[(WIDTH/8) * HEIGHT]; + glGetTexImage(GL_TEXTURE_2D, 0, GL_RED_INTEGER, GL_UNSIGNED_SHORT, ac2_ac5_data); + check_error(); + + glBindTexture(GL_TEXTURE_2D, ac3_tex); + int8_t *ac3_data = new int8_t[(WIDTH/8) * HEIGHT]; + glGetTexImage(GL_TEXTURE_2D, 0, GL_RED_INTEGER, GL_BYTE, ac3_data); + check_error(); + + glBindTexture(GL_TEXTURE_2D, ac4_tex); + int8_t *ac4_data = new int8_t[(WIDTH/8) * HEIGHT]; + glGetTexImage(GL_TEXTURE_2D, 0, GL_RED_INTEGER, GL_BYTE, ac4_data); + check_error(); + + for (unsigned y = 0; y < HEIGHT; ++y) { + for (unsigned xb = 0; xb < WIDTH/8; ++xb) { + coeff_y[y * WIDTH + xb*8 + 0] = int(dc_ac7_data[y * (WIDTH/8) + xb] << 23) >> 23; + coeff_y[y * WIDTH + xb*8 + 7] = int(dc_ac7_data[y * (WIDTH/8) + xb] << 16) >> 25; + coeff_y[y * WIDTH + xb*8 + 1] = int(ac1_ac6_data[y * (WIDTH/8) + xb] << 23) >> 23; + coeff_y[y * WIDTH + xb*8 + 6] = int(ac1_ac6_data[y * (WIDTH/8) + xb] << 16) >> 25; + coeff_y[y * WIDTH + xb*8 + 2] = int(ac2_ac5_data[y * (WIDTH/8) + xb] << 23) >> 23; + coeff_y[y * WIDTH + xb*8 + 5] = int(ac2_ac5_data[y * (WIDTH/8) + xb] << 16) >> 25; + coeff_y[y * WIDTH + xb*8 + 3] = ac3_data[y * (WIDTH/8) + xb]; + coeff_y[y * WIDTH + xb*8 + 4] = ac4_data[y * (WIDTH/8) + xb]; + } + } + +#if 1 + for (unsigned y = 0; y < HEIGHT; ++y) { + for (unsigned xb = 0; xb < WIDTH/8; ++xb) { + printf("%4d %4d %4d %4d %4d %4d %4d %4d | ", + coeff_y[y * WIDTH + xb*8 + 0], + coeff_y[y * WIDTH + xb*8 + 1], + coeff_y[y * WIDTH + xb*8 + 2], + coeff_y[y * WIDTH + xb*8 + 3], + coeff_y[y * WIDTH + xb*8 + 4], + coeff_y[y * WIDTH + xb*8 + 5], + coeff_y[y * WIDTH + xb*8 + 6], + coeff_y[y * WIDTH + xb*8 + 7]); + } + printf("\n"); + } +#endif + + // DC coefficient pred from the right to left (within each slice) + for (unsigned block_idx = 0; block_idx < NUM_BLOCKS; block_idx += BLOCKS_PER_STREAM) { + int prev_k = 128; + + for (unsigned subblock_idx = BLOCKS_PER_STREAM; subblock_idx --> 0; ) { + unsigned yb = (block_idx + subblock_idx) / WIDTH_BLOCKS; + unsigned xb = (block_idx + subblock_idx) % WIDTH_BLOCKS; + int k = coeff_y[(yb * 8) * WIDTH + xb * 8]; + + coeff_y[(yb * 8) * WIDTH + xb * 8] = k - prev_k; + + prev_k = k; + } + } + + // For each coefficient, make some tables. + size_t extra_bits = 0; + for (unsigned i = 0; i < 64; ++i) { + stats[i].clear(); + } + for (unsigned y = 0; y < 8; ++y) { + for (unsigned x = 0; x < 8; ++x) { + SymbolStats &s_luma = stats[pick_stats_for(x, y)]; + + // Luma + for (unsigned yb = 0; yb < HEIGHT; yb += 8) { + for (unsigned xb = 0; xb < WIDTH; xb += 8) { + unsigned short k = abs(coeff_y[(yb + y) * WIDTH + (xb + x)]); + if (k >= ESCAPE_LIMIT) { + k = ESCAPE_LIMIT; + extra_bits += 12; // escape this one + } + ++s_luma.freqs[(k - 1) & (NUM_SYMS - 1)]; + } + } + } + } + + for (unsigned i = 0; i < 64; ++i) { + stats[i].freqs[NUM_SYMS - 1] /= 2; // zero, has no sign bits (yes, this is trickery) + stats[i].normalize_freqs(prob_scale); + stats[i].cum_freqs[NUM_SYMS] += stats[i].freqs[NUM_SYMS - 1]; + stats[i].freqs[NUM_SYMS - 1] *= 2; + } + + FILE *codedfp = fopen("coded.dat", "wb"); + if (codedfp == nullptr) { + perror("coded.dat"); + exit(1); + } + + for (unsigned r = 0; r < 2; ++r) { // Hack to write fake chroma tables. + // TODO: rather gamma-k or something + for (unsigned i = 0; i < 64; ++i) { + if (stats[i].cum_freqs[NUM_SYMS] == 0) { + continue; + } + printf("writing table %d\n", i); + for (unsigned j = 0; j < NUM_SYMS; ++j) { + write_varint(stats[i].freqs[j], codedfp); + } + } + } + + RansEncoder rans_encoder; + + size_t tot_bytes = 0; + + // Luma + for (unsigned y = 0; y < 8; ++y) { + for (unsigned x = 0; x < 8; ++x) { + SymbolStats &s_luma = stats[pick_stats_for(x, y)]; + rans_encoder.init_prob(s_luma); + + // Luma + std::vector lens; + + rans_encoder.clear(); + size_t num_bytes = 0; + for (unsigned block_idx = 0; block_idx < NUM_BLOCKS; ++block_idx) { + unsigned yb = block_idx / WIDTH_BLOCKS; + unsigned xb = block_idx % WIDTH_BLOCKS; + + int k = coeff_y[(yb * 8 + y) * WIDTH + (xb * 8 + x)]; + rans_encoder.encode_coeff(k); + + if (block_idx % BLOCKS_PER_STREAM == (BLOCKS_PER_STREAM - 1) || block_idx == NUM_BLOCKS - 1) { + int l = rans_encoder.save_block(codedfp); + num_bytes += l; + lens.push_back(l); + } + } + tot_bytes += num_bytes; + printf("coeff %d Y': %ld bytes\n", y * 8 + x, num_bytes); + } + } + + printf("%ld bytes + %ld escape bits (%ld) = %ld total bytes\n", + tot_bytes - extra_bits / 8, + extra_bits, + extra_bits / 8, + tot_bytes); + + printf("\n"); + printf("Each iteration took %.3f ms (but note that is DCT only, no rANS).\n", 1e3 * duration(now - start).count() / num_iterations); + +}