vp9_lookahead.c 6.82 KB
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/*
 *  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>
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#include "./vpx_config.h"
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#include "vp9/common/vp9_common.h"
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#include "vp9/encoder/vp9_encoder.h"
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#include "vp9/encoder/vp9_extend.h"
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#include "vp9/encoder/vp9_lookahead.h"
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/* Return the buffer at the given absolute index and increment the index */
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static struct lookahead_entry *pop(struct lookahead_ctx *ctx, int *idx) {
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  int index = *idx;
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  struct lookahead_entry *buf = ctx->buf + index;

  assert(index < ctx->max_sz);
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  if (++index >= ctx->max_sz) index -= ctx->max_sz;
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  *idx = index;
  return buf;
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}

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void vp9_lookahead_destroy(struct lookahead_ctx *ctx) {
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  if (ctx) {
    if (ctx->buf) {
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      int i;
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      for (i = 0; i < ctx->max_sz; i++) vpx_free_frame_buffer(&ctx->buf[i].img);
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      free(ctx->buf);
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    }
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    free(ctx);
  }
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}

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struct lookahead_ctx *vp9_lookahead_init(unsigned int width,
                                         unsigned int height,
                                         unsigned int subsampling_x,
                                         unsigned int subsampling_y,
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#if CONFIG_VP9_HIGHBITDEPTH
                                         int use_highbitdepth,
#endif
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                                         unsigned int depth) {
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  struct lookahead_ctx *ctx = NULL;

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  // Clamp the lookahead queue depth
  depth = clamp(depth, 1, MAX_LAG_BUFFERS);
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  // Allocate memory to keep previous source frames available.
  depth += MAX_PRE_FRAMES;

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  // Allocate the lookahead structures
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  ctx = calloc(1, sizeof(*ctx));
  if (ctx) {
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    const int legacy_byte_alignment = 0;
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    unsigned int i;
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    ctx->max_sz = depth;
    ctx->buf = calloc(depth, sizeof(*ctx->buf));
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    if (!ctx->buf) goto bail;
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    for (i = 0; i < depth; i++)
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      if (vpx_alloc_frame_buffer(
              &ctx->buf[i].img, width, height, subsampling_x, subsampling_y,
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#if CONFIG_VP9_HIGHBITDEPTH
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              use_highbitdepth,
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#endif
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              VP9_ENC_BORDER_IN_PIXELS, legacy_byte_alignment))
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        goto bail;
  }
  return ctx;
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bail:
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  vp9_lookahead_destroy(ctx);
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  return NULL;
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}

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#define USE_PARTIAL_COPY 0
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int vp9_lookahead_push(struct lookahead_ctx *ctx, YV12_BUFFER_CONFIG *src,
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                       int64_t ts_start, int64_t ts_end,
#if CONFIG_VP9_HIGHBITDEPTH
                       int use_highbitdepth,
#endif
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                       vpx_enc_frame_flags_t flags) {
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  struct lookahead_entry *buf;
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#if USE_PARTIAL_COPY
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  int row, col, active_end;
  int mb_rows = (src->y_height + 15) >> 4;
  int mb_cols = (src->y_width + 15) >> 4;
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#endif
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  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;
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  if (ctx->sz + 1 + MAX_PRE_FRAMES > ctx->max_sz) return 1;
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  ctx->sz++;
  buf = pop(ctx, &ctx->write_idx);

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  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;
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  larger_dimensions = width > buf->img.y_width || height > buf->img.y_height ||
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                      uv_width > buf->img.uv_width ||
                      uv_height > buf->img.uv_height;
  assert(!larger_dimensions || new_dimensions);

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#if USE_PARTIAL_COPY
  // TODO(jkoleszar): This is disabled for now, as
  // vp9_copy_and_extend_frame_with_rect is not subsampling/alpha aware.

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  // 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.
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  if (!new_dimensions && ctx->max_sz == 1 && active_map && !flags) {
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    for (row = 0; row < mb_rows; ++row) {
      col = 0;

      while (1) {
        // Find the first active macroblock in this row.
        for (; col < mb_cols; ++col) {
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          if (active_map[col]) break;
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        }
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        // No more active macroblock in this row.
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        if (col == mb_cols) break;
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        // Find the end of active region in this row.
        active_end = col;

        for (; active_end < mb_cols; ++active_end) {
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          if (!active_map[active_end]) break;
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        }

        // Only copy this active region.
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        vp9_copy_and_extend_frame_with_rect(src, &buf->img, row << 4, col << 4,
                                            16, (active_end - col) << 4);
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        // Start again from the end of this active region.
        col = active_end;
      }

      active_map += mb_cols;
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    }
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  } else {
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#endif
    if (larger_dimensions) {
      YV12_BUFFER_CONFIG new_img;
      memset(&new_img, 0, sizeof(new_img));
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      if (vpx_alloc_frame_buffer(&new_img, width, height, subsampling_x,
                                 subsampling_y,
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#if CONFIG_VP9_HIGHBITDEPTH
                                 use_highbitdepth,
#endif
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                                 VP9_ENC_BORDER_IN_PIXELS, 0))
        return 1;
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      vpx_free_frame_buffer(&buf->img);
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      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
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    vp9_copy_and_extend_frame(src, &buf->img);
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#if USE_PARTIAL_COPY
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  }
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#endif

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  buf->ts_start = ts_start;
  buf->ts_end = ts_end;
  buf->flags = flags;
  return 0;
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}

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struct lookahead_entry *vp9_lookahead_pop(struct lookahead_ctx *ctx,
                                          int drain) {
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  struct lookahead_entry *buf = NULL;

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  if (ctx && ctx->sz && (drain || ctx->sz == ctx->max_sz - MAX_PRE_FRAMES)) {
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    buf = pop(ctx, &ctx->read_idx);
    ctx->sz--;
  }
  return buf;
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}

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struct lookahead_entry *vp9_lookahead_peek(struct lookahead_ctx *ctx,
                                           int index) {
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  struct lookahead_entry *buf = NULL;

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  if (index >= 0) {
    // Forward peek
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    if (index < ctx->sz) {
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      index += ctx->read_idx;
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      if (index >= ctx->max_sz) index -= ctx->max_sz;
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      buf = ctx->buf + index;
    }
  } else if (index < 0) {
    // Backward peek
    if (-index <= MAX_PRE_FRAMES) {
      index += ctx->read_idx;
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      if (index < 0) index += ctx->max_sz;
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      buf = ctx->buf + index;
    }
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  }
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  return buf;
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}

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unsigned int vp9_lookahead_depth(struct lookahead_ctx *ctx) { return ctx->sz; }