| // Copyright 2011 Google Inc. All Rights Reserved. |
| // |
| // Use of this source code is governed by a BSD-style license |
| // that can be found in the COPYING file in the root of the source |
| // tree. An additional intellectual property rights grant can be found |
| // in the file PATENTS. All contributing project authors may |
| // be found in the AUTHORS file in the root of the source tree. |
| // ----------------------------------------------------------------------------- |
| // |
| // WebP encoder: main entry point |
| // |
| // Author: Skal (pascal.massimino@gmail.com) |
| |
| #if defined(STARBOARD) |
| #include "starboard/client_porting/poem/assert_poem.h" |
| #include "starboard/client_porting/poem/string_poem.h" |
| #else |
| #include <assert.h> |
| #include <string.h> |
| #endif |
| |
| #include <math.h> |
| #include <stdlib.h> |
| |
| #include "src/enc/cost_enc.h" |
| #include "src/enc/vp8i_enc.h" |
| #include "src/enc/vp8li_enc.h" |
| #include "src/utils/utils.h" |
| |
| // #define PRINT_MEMORY_INFO |
| |
| #ifdef PRINT_MEMORY_INFO |
| #include <stdio.h> |
| #endif |
| |
| //------------------------------------------------------------------------------ |
| |
| int WebPGetEncoderVersion(void) { |
| return (ENC_MAJ_VERSION << 16) | (ENC_MIN_VERSION << 8) | ENC_REV_VERSION; |
| } |
| |
| //------------------------------------------------------------------------------ |
| // VP8Encoder |
| //------------------------------------------------------------------------------ |
| |
| static void ResetSegmentHeader(VP8Encoder* const enc) { |
| VP8EncSegmentHeader* const hdr = &enc->segment_hdr_; |
| hdr->num_segments_ = enc->config_->segments; |
| hdr->update_map_ = (hdr->num_segments_ > 1); |
| hdr->size_ = 0; |
| } |
| |
| static void ResetFilterHeader(VP8Encoder* const enc) { |
| VP8EncFilterHeader* const hdr = &enc->filter_hdr_; |
| hdr->simple_ = 1; |
| hdr->level_ = 0; |
| hdr->sharpness_ = 0; |
| hdr->i4x4_lf_delta_ = 0; |
| } |
| |
| static void ResetBoundaryPredictions(VP8Encoder* const enc) { |
| // init boundary values once for all |
| // Note: actually, initializing the preds_[] is only needed for intra4. |
| int i; |
| uint8_t* const top = enc->preds_ - enc->preds_w_; |
| uint8_t* const left = enc->preds_ - 1; |
| for (i = -1; i < 4 * enc->mb_w_; ++i) { |
| top[i] = B_DC_PRED; |
| } |
| for (i = 0; i < 4 * enc->mb_h_; ++i) { |
| left[i * enc->preds_w_] = B_DC_PRED; |
| } |
| enc->nz_[-1] = 0; // constant |
| } |
| |
| // Mapping from config->method_ to coding tools used. |
| //-------------------+---+---+---+---+---+---+---+ |
| // Method | 0 | 1 | 2 | 3 |(4)| 5 | 6 | |
| //-------------------+---+---+---+---+---+---+---+ |
| // fast probe | x | | | x | | | | |
| //-------------------+---+---+---+---+---+---+---+ |
| // dynamic proba | ~ | x | x | x | x | x | x | |
| //-------------------+---+---+---+---+---+---+---+ |
| // fast mode analysis|[x]|[x]| | | x | x | x | |
| //-------------------+---+---+---+---+---+---+---+ |
| // basic rd-opt | | | | x | x | x | x | |
| //-------------------+---+---+---+---+---+---+---+ |
| // disto-refine i4/16| x | x | x | | | | | |
| //-------------------+---+---+---+---+---+---+---+ |
| // disto-refine uv | | x | x | | | | | |
| //-------------------+---+---+---+---+---+---+---+ |
| // rd-opt i4/16 | | | ~ | x | x | x | x | |
| //-------------------+---+---+---+---+---+---+---+ |
| // token buffer (opt)| | | | x | x | x | x | |
| //-------------------+---+---+---+---+---+---+---+ |
| // Trellis | | | | | | x |Ful| |
| //-------------------+---+---+---+---+---+---+---+ |
| // full-SNS | | | | | x | x | x | |
| //-------------------+---+---+---+---+---+---+---+ |
| |
| static void MapConfigToTools(VP8Encoder* const enc) { |
| const WebPConfig* const config = enc->config_; |
| const int method = config->method; |
| const int limit = 100 - config->partition_limit; |
| enc->method_ = method; |
| enc->rd_opt_level_ = (method >= 6) ? RD_OPT_TRELLIS_ALL |
| : (method >= 5) ? RD_OPT_TRELLIS |
| : (method >= 3) ? RD_OPT_BASIC |
| : RD_OPT_NONE; |
| enc->max_i4_header_bits_ = |
| 256 * 16 * 16 * // upper bound: up to 16bit per 4x4 block |
| (limit * limit) / (100 * 100); // ... modulated with a quadratic curve. |
| |
| // partition0 = 512k max. |
| enc->mb_header_limit_ = |
| (score_t)256 * 510 * 8 * 1024 / (enc->mb_w_ * enc->mb_h_); |
| |
| enc->thread_level_ = config->thread_level; |
| |
| enc->do_search_ = (config->target_size > 0 || config->target_PSNR > 0); |
| if (!config->low_memory) { |
| #if !defined(DISABLE_TOKEN_BUFFER) |
| enc->use_tokens_ = (enc->rd_opt_level_ >= RD_OPT_BASIC); // need rd stats |
| #endif |
| if (enc->use_tokens_) { |
| enc->num_parts_ = 1; // doesn't work with multi-partition |
| } |
| } |
| } |
| |
| // Memory scaling with dimensions: |
| // memory (bytes) ~= 2.25 * w + 0.0625 * w * h |
| // |
| // Typical memory footprint (614x440 picture) |
| // encoder: 22111 |
| // info: 4368 |
| // preds: 17741 |
| // top samples: 1263 |
| // non-zero: 175 |
| // lf-stats: 0 |
| // total: 45658 |
| // Transient object sizes: |
| // VP8EncIterator: 3360 |
| // VP8ModeScore: 872 |
| // VP8SegmentInfo: 732 |
| // VP8EncProba: 18352 |
| // LFStats: 2048 |
| // Picture size (yuv): 419328 |
| |
| static VP8Encoder* InitVP8Encoder(const WebPConfig* const config, |
| WebPPicture* const picture) { |
| VP8Encoder* enc; |
| const int use_filter = |
| (config->filter_strength > 0) || (config->autofilter > 0); |
| const int mb_w = (picture->width + 15) >> 4; |
| const int mb_h = (picture->height + 15) >> 4; |
| const int preds_w = 4 * mb_w + 1; |
| const int preds_h = 4 * mb_h + 1; |
| const size_t preds_size = preds_w * preds_h * sizeof(*enc->preds_); |
| const int top_stride = mb_w * 16; |
| const size_t nz_size = (mb_w + 1) * sizeof(*enc->nz_) + WEBP_ALIGN_CST; |
| const size_t info_size = mb_w * mb_h * sizeof(*enc->mb_info_); |
| const size_t samples_size = |
| 2 * top_stride * sizeof(*enc->y_top_) // top-luma/u/v |
| + WEBP_ALIGN_CST; // align all |
| const size_t lf_stats_size = |
| config->autofilter ? sizeof(*enc->lf_stats_) + WEBP_ALIGN_CST : 0; |
| const size_t top_derr_size = |
| (config->quality <= ERROR_DIFFUSION_QUALITY || config->pass > 1) ? |
| mb_w * sizeof(*enc->top_derr_) : 0; |
| uint8_t* mem; |
| const uint64_t size = (uint64_t)sizeof(*enc) // main struct |
| + WEBP_ALIGN_CST // cache alignment |
| + info_size // modes info |
| + preds_size // prediction modes |
| + samples_size // top/left samples |
| + top_derr_size // top diffusion error |
| + nz_size // coeff context bits |
| + lf_stats_size; // autofilter stats |
| |
| #ifdef PRINT_MEMORY_INFO |
| printf("===================================\n"); |
| printf("Memory used:\n" |
| " encoder: %ld\n" |
| " info: %ld\n" |
| " preds: %ld\n" |
| " top samples: %ld\n" |
| " top diffusion: %ld\n" |
| " non-zero: %ld\n" |
| " lf-stats: %ld\n" |
| " total: %ld\n", |
| sizeof(*enc) + WEBP_ALIGN_CST, info_size, |
| preds_size, samples_size, top_derr_size, nz_size, lf_stats_size, size); |
| printf("Transient object sizes:\n" |
| " VP8EncIterator: %ld\n" |
| " VP8ModeScore: %ld\n" |
| " VP8SegmentInfo: %ld\n" |
| " VP8EncProba: %ld\n" |
| " LFStats: %ld\n", |
| sizeof(VP8EncIterator), sizeof(VP8ModeScore), |
| sizeof(VP8SegmentInfo), sizeof(VP8EncProba), |
| sizeof(LFStats)); |
| printf("Picture size (yuv): %ld\n", |
| mb_w * mb_h * 384 * sizeof(uint8_t)); |
| printf("===================================\n"); |
| #endif |
| mem = (uint8_t*)WebPSafeMalloc(size, sizeof(*mem)); |
| if (mem == NULL) { |
| WebPEncodingSetError(picture, VP8_ENC_ERROR_OUT_OF_MEMORY); |
| return NULL; |
| } |
| enc = (VP8Encoder*)mem; |
| mem = (uint8_t*)WEBP_ALIGN(mem + sizeof(*enc)); |
| memset(enc, 0, sizeof(*enc)); |
| enc->num_parts_ = 1 << config->partitions; |
| enc->mb_w_ = mb_w; |
| enc->mb_h_ = mb_h; |
| enc->preds_w_ = preds_w; |
| enc->mb_info_ = (VP8MBInfo*)mem; |
| mem += info_size; |
| enc->preds_ = mem + 1 + enc->preds_w_; |
| mem += preds_size; |
| enc->nz_ = 1 + (uint32_t*)WEBP_ALIGN(mem); |
| mem += nz_size; |
| enc->lf_stats_ = lf_stats_size ? (LFStats*)WEBP_ALIGN(mem) : NULL; |
| mem += lf_stats_size; |
| |
| // top samples (all 16-aligned) |
| mem = (uint8_t*)WEBP_ALIGN(mem); |
| enc->y_top_ = mem; |
| enc->uv_top_ = enc->y_top_ + top_stride; |
| mem += 2 * top_stride; |
| enc->top_derr_ = top_derr_size ? (DError*)mem : NULL; |
| mem += top_derr_size; |
| assert(mem <= (uint8_t*)enc + size); |
| |
| enc->config_ = config; |
| enc->profile_ = use_filter ? ((config->filter_type == 1) ? 0 : 1) : 2; |
| enc->pic_ = picture; |
| enc->percent_ = 0; |
| |
| MapConfigToTools(enc); |
| VP8EncDspInit(); |
| VP8DefaultProbas(enc); |
| ResetSegmentHeader(enc); |
| ResetFilterHeader(enc); |
| ResetBoundaryPredictions(enc); |
| VP8EncDspCostInit(); |
| VP8EncInitAlpha(enc); |
| |
| // lower quality means smaller output -> we modulate a little the page |
| // size based on quality. This is just a crude 1rst-order prediction. |
| { |
| const float scale = 1.f + config->quality * 5.f / 100.f; // in [1,6] |
| VP8TBufferInit(&enc->tokens_, (int)(mb_w * mb_h * 4 * scale)); |
| } |
| return enc; |
| } |
| |
| static int DeleteVP8Encoder(VP8Encoder* enc) { |
| int ok = 1; |
| if (enc != NULL) { |
| ok = VP8EncDeleteAlpha(enc); |
| VP8TBufferClear(&enc->tokens_); |
| WebPSafeFree(enc); |
| } |
| return ok; |
| } |
| |
| //------------------------------------------------------------------------------ |
| |
| #if !defined(WEBP_DISABLE_STATS) |
| static double GetPSNR(uint64_t err, uint64_t size) { |
| return (err > 0 && size > 0) ? 10. * log10(255. * 255. * size / err) : 99.; |
| } |
| |
| static void FinalizePSNR(const VP8Encoder* const enc) { |
| WebPAuxStats* stats = enc->pic_->stats; |
| const uint64_t size = enc->sse_count_; |
| const uint64_t* const sse = enc->sse_; |
| stats->PSNR[0] = (float)GetPSNR(sse[0], size); |
| stats->PSNR[1] = (float)GetPSNR(sse[1], size / 4); |
| stats->PSNR[2] = (float)GetPSNR(sse[2], size / 4); |
| stats->PSNR[3] = (float)GetPSNR(sse[0] + sse[1] + sse[2], size * 3 / 2); |
| stats->PSNR[4] = (float)GetPSNR(sse[3], size); |
| } |
| #endif // !defined(WEBP_DISABLE_STATS) |
| |
| static void StoreStats(VP8Encoder* const enc) { |
| #if !defined(WEBP_DISABLE_STATS) |
| WebPAuxStats* const stats = enc->pic_->stats; |
| if (stats != NULL) { |
| int i, s; |
| for (i = 0; i < NUM_MB_SEGMENTS; ++i) { |
| stats->segment_level[i] = enc->dqm_[i].fstrength_; |
| stats->segment_quant[i] = enc->dqm_[i].quant_; |
| for (s = 0; s <= 2; ++s) { |
| stats->residual_bytes[s][i] = enc->residual_bytes_[s][i]; |
| } |
| } |
| FinalizePSNR(enc); |
| stats->coded_size = enc->coded_size_; |
| for (i = 0; i < 3; ++i) { |
| stats->block_count[i] = enc->block_count_[i]; |
| } |
| } |
| #else // defined(WEBP_DISABLE_STATS) |
| WebPReportProgress(enc->pic_, 100, &enc->percent_); // done! |
| #endif // !defined(WEBP_DISABLE_STATS) |
| } |
| |
| int WebPEncodingSetError(const WebPPicture* const pic, |
| WebPEncodingError error) { |
| assert((int)error < VP8_ENC_ERROR_LAST); |
| assert((int)error >= VP8_ENC_OK); |
| // The oldest error reported takes precedence over the new one. |
| if (pic->error_code == VP8_ENC_OK) { |
| ((WebPPicture*)pic)->error_code = error; |
| } |
| return 0; |
| } |
| |
| int WebPReportProgress(const WebPPicture* const pic, |
| int percent, int* const percent_store) { |
| if (percent_store != NULL && percent != *percent_store) { |
| *percent_store = percent; |
| if (pic->progress_hook && !pic->progress_hook(percent, pic)) { |
| // user abort requested |
| return WebPEncodingSetError(pic, VP8_ENC_ERROR_USER_ABORT); |
| } |
| } |
| return 1; // ok |
| } |
| //------------------------------------------------------------------------------ |
| |
| int WebPEncode(const WebPConfig* config, WebPPicture* pic) { |
| int ok = 0; |
| if (pic == NULL) return 0; |
| |
| pic->error_code = VP8_ENC_OK; // all ok so far |
| if (config == NULL) { // bad params |
| return WebPEncodingSetError(pic, VP8_ENC_ERROR_NULL_PARAMETER); |
| } |
| if (!WebPValidateConfig(config)) { |
| return WebPEncodingSetError(pic, VP8_ENC_ERROR_INVALID_CONFIGURATION); |
| } |
| if (!WebPValidatePicture(pic)) return 0; |
| if (pic->width > WEBP_MAX_DIMENSION || pic->height > WEBP_MAX_DIMENSION) { |
| return WebPEncodingSetError(pic, VP8_ENC_ERROR_BAD_DIMENSION); |
| } |
| |
| if (pic->stats != NULL) memset(pic->stats, 0, sizeof(*pic->stats)); |
| |
| if (!config->lossless) { |
| VP8Encoder* enc = NULL; |
| |
| if (pic->use_argb || pic->y == NULL || pic->u == NULL || pic->v == NULL) { |
| // Make sure we have YUVA samples. |
| if (config->use_sharp_yuv || (config->preprocessing & 4)) { |
| if (!WebPPictureSharpARGBToYUVA(pic)) { |
| return 0; |
| } |
| } else { |
| float dithering = 0.f; |
| if (config->preprocessing & 2) { |
| const float x = config->quality / 100.f; |
| const float x2 = x * x; |
| // slowly decreasing from max dithering at low quality (q->0) |
| // to 0.5 dithering amplitude at high quality (q->100) |
| dithering = 1.0f + (0.5f - 1.0f) * x2 * x2; |
| } |
| if (!WebPPictureARGBToYUVADithered(pic, WEBP_YUV420, dithering)) { |
| return 0; |
| } |
| } |
| } |
| |
| if (!config->exact) { |
| WebPCleanupTransparentArea(pic); |
| } |
| |
| enc = InitVP8Encoder(config, pic); |
| if (enc == NULL) return 0; // pic->error is already set. |
| // Note: each of the tasks below account for 20% in the progress report. |
| ok = VP8EncAnalyze(enc); |
| |
| // Analysis is done, proceed to actual coding. |
| ok = ok && VP8EncStartAlpha(enc); // possibly done in parallel |
| if (!enc->use_tokens_) { |
| ok = ok && VP8EncLoop(enc); |
| } else { |
| ok = ok && VP8EncTokenLoop(enc); |
| } |
| ok = ok && VP8EncFinishAlpha(enc); |
| |
| ok = ok && VP8EncWrite(enc); |
| StoreStats(enc); |
| if (!ok) { |
| VP8EncFreeBitWriters(enc); |
| } |
| ok &= DeleteVP8Encoder(enc); // must always be called, even if !ok |
| } else { |
| // Make sure we have ARGB samples. |
| if (pic->argb == NULL && !WebPPictureYUVAToARGB(pic)) { |
| return 0; |
| } |
| |
| if (!config->exact) { |
| WebPReplaceTransparentPixels(pic, 0x000000); |
| } |
| |
| ok = VP8LEncodeImage(config, pic); // Sets pic->error in case of problem. |
| } |
| |
| return ok; |
| } |
