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 VP9_ENCODER_VP9_LOOKAHEAD_H_
12 #define VP9_ENCODER_VP9_LOOKAHEAD_H_
14 #include "vpx_scale/yv12config.h"
15 #include "vpx/vpx_integer.h"
17 #if CONFIG_SPATIAL_SVC
18 #include "vpx/vp8cx.h"
19 #include "vpx/vpx_encoder.h"
26 #define MAX_LAG_BUFFERS 25
28 struct lookahead_entry {
29 YV12_BUFFER_CONFIG img;
35 // The max of past frames we want to keep in the queue.
36 #define MAX_PRE_FRAMES 1
38 struct lookahead_ctx {
39 unsigned int max_sz; /* Absolute size of the queue */
40 unsigned int sz; /* Number of buffers currently in the queue */
41 unsigned int read_idx; /* Read index */
42 unsigned int write_idx; /* Write index */
43 struct lookahead_entry *buf; /* Buffer list */
46 /**\brief Initializes the lookahead stage
48 * The lookahead stage is a queue of frame buffers on which some analysis
49 * may be done when buffers are enqueued.
51 struct lookahead_ctx *vp9_lookahead_init(unsigned int width,
53 unsigned int subsampling_x,
54 unsigned int subsampling_y,
55 #if CONFIG_VP9_HIGHBITDEPTH
61 /**\brief Destroys the lookahead stage
63 void vp9_lookahead_destroy(struct lookahead_ctx *ctx);
66 /**\brief Enqueue a source buffer
68 * This function will copy the source image into a new framebuffer with
69 * the expected stride/border.
71 * If active_map is non-NULL and there is only one frame in the queue, then copy
72 * only active macroblocks.
74 * \param[in] ctx Pointer to the lookahead context
75 * \param[in] src Pointer to the image to enqueue
76 * \param[in] ts_start Timestamp for the start of this frame
77 * \param[in] ts_end Timestamp for the end of this frame
78 * \param[in] flags Flags set on this frame
79 * \param[in] active_map Map that specifies which macroblock is active
81 int vp9_lookahead_push(struct lookahead_ctx *ctx, YV12_BUFFER_CONFIG *src,
82 int64_t ts_start, int64_t ts_end, unsigned int flags);
85 /**\brief Get the next source buffer to encode
88 * \param[in] ctx Pointer to the lookahead context
89 * \param[in] drain Flag indicating the buffer should be drained
90 * (return a buffer regardless of the current queue depth)
92 * \retval NULL, if drain set and queue is empty
93 * \retval NULL, if drain not set and queue not of the configured depth
95 struct lookahead_entry *vp9_lookahead_pop(struct lookahead_ctx *ctx,
99 /**\brief Get a future source buffer to encode
101 * \param[in] ctx Pointer to the lookahead context
102 * \param[in] index Index of the frame to be returned, 0 == next frame
104 * \retval NULL, if no buffer exists at the specified index
106 struct lookahead_entry *vp9_lookahead_peek(struct lookahead_ctx *ctx,
110 /**\brief Get the number of frames currently in the lookahead queue
112 * \param[in] ctx Pointer to the lookahead context
114 unsigned int vp9_lookahead_depth(struct lookahead_ctx *ctx);
120 #endif // VP9_ENCODER_VP9_LOOKAHEAD_H_