ref: 5404978825e174835932d9bf740e7538beb10898
dir: /vp9/encoder/vp9_lookahead.c/
/* * Copyright (c) 2011 The WebM project authors. All Rights Reserved. * * Use of this source code is governed by a BSD-style license * that can be found in the LICENSE 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. */ #include <assert.h> #include <stdlib.h> #include "./vpx_config.h" #include "vp9/common/vp9_common.h" #include "vp9/encoder/vp9_encoder.h" #include "vp9/encoder/vp9_extend.h" #include "vp9/encoder/vp9_lookahead.h" /* Return the buffer at the given absolute index and increment the index */ static struct lookahead_entry *pop(struct lookahead_ctx *ctx, unsigned int *idx) { unsigned int index = *idx; struct lookahead_entry *buf = ctx->buf + index; assert(index < ctx->max_sz); if (++index >= ctx->max_sz) index -= ctx->max_sz; *idx = index; return buf; } void vp9_lookahead_destroy(struct lookahead_ctx *ctx) { if (ctx) { if (ctx->buf) { unsigned int i; for (i = 0; i < ctx->max_sz; i++) vpx_free_frame_buffer(&ctx->buf[i].img); free(ctx->buf); } free(ctx); } } struct lookahead_ctx *vp9_lookahead_init(unsigned int width, unsigned int height, unsigned int subsampling_x, unsigned int subsampling_y, #if CONFIG_VP9_HIGHBITDEPTH int use_highbitdepth, #endif unsigned int depth) { struct lookahead_ctx *ctx = NULL; // Clamp the lookahead queue depth depth = clamp(depth, 1, MAX_LAG_BUFFERS); // Allocate memory to keep previous source frames available. depth += MAX_PRE_FRAMES; // Allocate the lookahead structures ctx = calloc(1, sizeof(*ctx)); if (ctx) { const int legacy_byte_alignment = 0; unsigned int i; ctx->max_sz = depth; ctx->buf = calloc(depth, sizeof(*ctx->buf)); if (!ctx->buf) goto bail; for (i = 0; i < depth; i++) if (vpx_alloc_frame_buffer(&ctx->buf[i].img, width, height, subsampling_x, subsampling_y, #if CONFIG_VP9_HIGHBITDEPTH use_highbitdepth, #endif VP9_ENC_BORDER_IN_PIXELS, legacy_byte_alignment)) goto bail; } return ctx; bail: vp9_lookahead_destroy(ctx); return NULL; } #define USE_PARTIAL_COPY 0 int vp9_lookahead_push(struct lookahead_ctx *ctx, YV12_BUFFER_CONFIG *src, int64_t ts_start, int64_t ts_end, #if CONFIG_VP9_HIGHBITDEPTH int use_highbitdepth, #endif unsigned int flags) { struct lookahead_entry *buf; #if USE_PARTIAL_COPY int row, col, active_end; int mb_rows = (src->y_height + 15) >> 4; int mb_cols = (src->y_width + 15) >> 4; #endif int width = src->y_crop_width; int height = src->y_crop_height; int uv_width = src->uv_crop_width; int uv_height = src->uv_crop_height; int subsampling_x = src->subsampling_x; int subsampling_y = src->subsampling_y; int larger_dimensions, new_dimensions; if (ctx->sz + 1 + MAX_PRE_FRAMES > ctx->max_sz) return 1; ctx->sz++; buf = pop(ctx, &ctx->write_idx); new_dimensions = width != buf->img.y_crop_width || height != buf->img.y_crop_height || uv_width != buf->img.uv_crop_width || uv_height != buf->img.uv_crop_height; larger_dimensions = width > buf->img.y_width || height > buf->img.y_height || uv_width > buf->img.uv_width || uv_height > buf->img.uv_height; assert(!larger_dimensions || new_dimensions); #if USE_PARTIAL_COPY // TODO(jkoleszar): This is disabled for now, as // vp9_copy_and_extend_frame_with_rect is not subsampling/alpha aware. // Only do this partial copy if the following conditions are all met: // 1. Lookahead queue has has size of 1. // 2. Active map is provided. // 3. This is not a key frame, golden nor altref frame. if (!new_dimensions && ctx->max_sz == 1 && active_map && !flags) { for (row = 0; row < mb_rows; ++row) { col = 0; while (1) { // Find the first active macroblock in this row. for (; col < mb_cols; ++col) { if (active_map[col]) break; } // No more active macroblock in this row. if (col == mb_cols) break; // Find the end of active region in this row. active_end = col; for (; active_end < mb_cols; ++active_end) { if (!active_map[active_end]) break; } // Only copy this active region. vp9_copy_and_extend_frame_with_rect(src, &buf->img, row << 4, col << 4, 16, (active_end - col) << 4); // Start again from the end of this active region. col = active_end; } active_map += mb_cols; } } else { #endif if (larger_dimensions) { YV12_BUFFER_CONFIG new_img; memset(&new_img, 0, sizeof(new_img)); if (vpx_alloc_frame_buffer(&new_img, width, height, subsampling_x, subsampling_y, #if CONFIG_VP9_HIGHBITDEPTH use_highbitdepth, #endif VP9_ENC_BORDER_IN_PIXELS, 0)) return 1; vpx_free_frame_buffer(&buf->img); buf->img = new_img; } else if (new_dimensions) { buf->img.y_crop_width = src->y_crop_width; buf->img.y_crop_height = src->y_crop_height; buf->img.uv_crop_width = src->uv_crop_width; buf->img.uv_crop_height = src->uv_crop_height; buf->img.subsampling_x = src->subsampling_x; buf->img.subsampling_y = src->subsampling_y; } // Partial copy not implemented yet vp9_copy_and_extend_frame(src, &buf->img); #if USE_PARTIAL_COPY } #endif buf->ts_start = ts_start; buf->ts_end = ts_end; buf->flags = flags; return 0; } struct lookahead_entry *vp9_lookahead_pop(struct lookahead_ctx *ctx, int drain) { struct lookahead_entry *buf = NULL; if (ctx->sz && (drain || ctx->sz == ctx->max_sz - MAX_PRE_FRAMES)) { buf = pop(ctx, &ctx->read_idx); ctx->sz--; } return buf; } struct lookahead_entry *vp9_lookahead_peek(struct lookahead_ctx *ctx, int index) { struct lookahead_entry *buf = NULL; if (index >= 0) { // Forward peek if (index < (int)ctx->sz) { index += ctx->read_idx; if (index >= (int)ctx->max_sz) index -= ctx->max_sz; buf = ctx->buf + index; } } else if (index < 0) { // Backward peek if (-index <= MAX_PRE_FRAMES) { index += ctx->read_idx; if (index < 0) index += ctx->max_sz; buf = ctx->buf + index; } } return buf; } unsigned int vp9_lookahead_depth(struct lookahead_ctx *ctx) { return ctx->sz; }