2 * Copyright (c) 2011 The WebM project authors. All Rights Reserved.
4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
11 #ifndef VP10_ENCODER_LOOKAHEAD_H_
12 #define VP10_ENCODER_LOOKAHEAD_H_
14 #include "vpx_scale/yv12config.h"
15 #include "vpx/vpx_integer.h"
21 #define MAX_LAG_BUFFERS 25
23 struct lookahead_entry {
24 YV12_BUFFER_CONFIG img;
30 // The max of past frames we want to keep in the queue.
31 #define MAX_PRE_FRAMES 1
33 struct lookahead_ctx {
34 unsigned int max_sz; /* Absolute size of the queue */
35 unsigned int sz; /* Number of buffers currently in the queue */
36 unsigned int read_idx; /* Read index */
37 unsigned int write_idx; /* Write index */
38 struct lookahead_entry *buf; /* Buffer list */
41 /**\brief Initializes the lookahead stage
43 * The lookahead stage is a queue of frame buffers on which some analysis
44 * may be done when buffers are enqueued.
46 struct lookahead_ctx *vp10_lookahead_init(unsigned int width,
48 unsigned int subsampling_x,
49 unsigned int subsampling_y,
50 #if CONFIG_VP9_HIGHBITDEPTH
56 /**\brief Destroys the lookahead stage
58 void vp10_lookahead_destroy(struct lookahead_ctx *ctx);
61 /**\brief Enqueue a source buffer
63 * This function will copy the source image into a new framebuffer with
64 * the expected stride/border.
66 * If active_map is non-NULL and there is only one frame in the queue, then copy
67 * only active macroblocks.
69 * \param[in] ctx Pointer to the lookahead context
70 * \param[in] src Pointer to the image to enqueue
71 * \param[in] ts_start Timestamp for the start of this frame
72 * \param[in] ts_end Timestamp for the end of this frame
73 * \param[in] flags Flags set on this frame
74 * \param[in] active_map Map that specifies which macroblock is active
76 int vp10_lookahead_push(struct lookahead_ctx *ctx, YV12_BUFFER_CONFIG *src,
77 int64_t ts_start, int64_t ts_end,
78 #if CONFIG_VP9_HIGHBITDEPTH
84 /**\brief Get the next source buffer to encode
87 * \param[in] ctx Pointer to the lookahead context
88 * \param[in] drain Flag indicating the buffer should be drained
89 * (return a buffer regardless of the current queue depth)
91 * \retval NULL, if drain set and queue is empty
92 * \retval NULL, if drain not set and queue not of the configured depth
94 struct lookahead_entry *vp10_lookahead_pop(struct lookahead_ctx *ctx,
98 /**\brief Get a future source buffer to encode
100 * \param[in] ctx Pointer to the lookahead context
101 * \param[in] index Index of the frame to be returned, 0 == next frame
103 * \retval NULL, if no buffer exists at the specified index
105 struct lookahead_entry *vp10_lookahead_peek(struct lookahead_ctx *ctx,
109 /**\brief Get the number of frames currently in the lookahead queue
111 * \param[in] ctx Pointer to the lookahead context
113 unsigned int vp10_lookahead_depth(struct lookahead_ctx *ctx);
119 #endif // VP10_ENCODER_LOOKAHEAD_H_