diff options
Diffstat (limited to 'third_party/aom/av1/encoder/lookahead.c')
| -rw-r--r-- | third_party/aom/av1/encoder/lookahead.c | 210 |
1 files changed, 210 insertions, 0 deletions
diff --git a/third_party/aom/av1/encoder/lookahead.c b/third_party/aom/av1/encoder/lookahead.c new file mode 100644 index 000000000..1bf8ecbac --- /dev/null +++ b/third_party/aom/av1/encoder/lookahead.c @@ -0,0 +1,210 @@ +/* + * Copyright (c) 2016, Alliance for Open Media. All rights reserved + * + * This source code is subject to the terms of the BSD 2 Clause License and + * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License + * was not distributed with this source code in the LICENSE file, you can + * obtain it at www.aomedia.org/license/software. If the Alliance for Open + * Media Patent License 1.0 was not distributed with this source code in the + * PATENTS file, you can obtain it at www.aomedia.org/license/patent. + */ +#include <assert.h> +#include <stdlib.h> + +#include "config/aom_config.h" + +#include "av1/common/common.h" +#include "av1/encoder/encoder.h" +#include "av1/encoder/extend.h" +#include "av1/encoder/lookahead.h" + +/* Return the buffer at the given absolute index and increment the index */ +static struct lookahead_entry *pop(struct lookahead_ctx *ctx, int *idx) { + 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 av1_lookahead_destroy(struct lookahead_ctx *ctx) { + if (ctx) { + if (ctx->buf) { + int i; + + for (i = 0; i < ctx->max_sz; i++) aom_free_frame_buffer(&ctx->buf[i].img); + free(ctx->buf); + } + free(ctx); + } +} + +struct lookahead_ctx *av1_lookahead_init( + unsigned int width, unsigned int height, unsigned int subsampling_x, + unsigned int subsampling_y, int use_highbitdepth, 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 (aom_alloc_frame_buffer(&ctx->buf[i].img, width, height, subsampling_x, + subsampling_y, use_highbitdepth, + AOM_BORDER_IN_PIXELS, legacy_byte_alignment)) + goto bail; + } + return ctx; +bail: + av1_lookahead_destroy(ctx); + return NULL; +} + +#define USE_PARTIAL_COPY 0 + +int av1_lookahead_push(struct lookahead_ctx *ctx, YV12_BUFFER_CONFIG *src, + int64_t ts_start, int64_t ts_end, int use_highbitdepth, + aom_enc_frame_flags_t 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 + // av1_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. + av1_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 (aom_alloc_frame_buffer(&new_img, width, height, subsampling_x, + subsampling_y, use_highbitdepth, + AOM_BORDER_IN_PIXELS, 0)) + return 1; + aom_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 + av1_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 *av1_lookahead_pop(struct lookahead_ctx *ctx, + int drain) { + struct lookahead_entry *buf = NULL; + + if (ctx && ctx->sz && (drain || ctx->sz == ctx->max_sz - MAX_PRE_FRAMES)) { + buf = pop(ctx, &ctx->read_idx); + ctx->sz--; + } + return buf; +} + +struct lookahead_entry *av1_lookahead_peek(struct lookahead_ctx *ctx, + int index) { + struct lookahead_entry *buf = NULL; + + if (index >= 0) { + // Forward peek + if (index < ctx->sz) { + index += ctx->read_idx; + if (index >= ctx->max_sz) index -= ctx->max_sz; + buf = ctx->buf + index; + } + } else if (index < 0) { + // Backward peek + if (-index <= MAX_PRE_FRAMES) { + index += (int)(ctx->read_idx); + if (index < 0) index += (int)(ctx->max_sz); + buf = ctx->buf + index; + } + } + + return buf; +} + +unsigned int av1_lookahead_depth(struct lookahead_ctx *ctx) { return ctx->sz; } |