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-rw-r--r--media/libvpx/vp9/encoder/vp9_lookahead.c245
1 files changed, 245 insertions, 0 deletions
diff --git a/media/libvpx/vp9/encoder/vp9_lookahead.c b/media/libvpx/vp9/encoder/vp9_lookahead.c
new file mode 100644
index 000000000..fd32a16b4
--- /dev/null
+++ b/media/libvpx/vp9/encoder/vp9_lookahead.c
@@ -0,0 +1,245 @@
+/*
+ * 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++)
+ vp9_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 (vp9_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 (vp9_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;
+ vp9_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 && 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;
+}