119 lines
3.8 KiB
C
119 lines
3.8 KiB
C
/*
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* Copyright (c) 2011 The WebM project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef VP9_ENCODER_VP9_LOOKAHEAD_H_
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#define VP9_ENCODER_VP9_LOOKAHEAD_H_
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#include "vpx_scale/yv12config.h"
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#include "vpx/vpx_encoder.h"
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#include "vpx/vpx_integer.h"
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#if CONFIG_SPATIAL_SVC
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#include "vpx/vp8cx.h"
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define MAX_LAG_BUFFERS 25
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struct lookahead_entry {
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YV12_BUFFER_CONFIG img;
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int64_t ts_start;
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int64_t ts_end;
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vpx_enc_frame_flags_t flags;
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};
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// The max of past frames we want to keep in the queue.
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#define MAX_PRE_FRAMES 1
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struct lookahead_ctx {
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int max_sz; /* Absolute size of the queue */
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int sz; /* Number of buffers currently in the queue */
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int read_idx; /* Read index */
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int write_idx; /* Write index */
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struct lookahead_entry *buf; /* Buffer list */
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};
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/**\brief Initializes the lookahead stage
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*
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* The lookahead stage is a queue of frame buffers on which some analysis
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* may be done when buffers are enqueued.
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*/
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struct lookahead_ctx *vp9_lookahead_init(unsigned int width,
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unsigned int height,
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unsigned int subsampling_x,
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unsigned int subsampling_y,
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#if CONFIG_VP9_HIGHBITDEPTH
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int use_highbitdepth,
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#endif
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unsigned int depth);
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/**\brief Destroys the lookahead stage
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*/
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void vp9_lookahead_destroy(struct lookahead_ctx *ctx);
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/**\brief Enqueue a source buffer
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*
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* This function will copy the source image into a new framebuffer with
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* the expected stride/border.
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*
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* If active_map is non-NULL and there is only one frame in the queue, then copy
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* only active macroblocks.
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*
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* \param[in] ctx Pointer to the lookahead context
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* \param[in] src Pointer to the image to enqueue
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* \param[in] ts_start Timestamp for the start of this frame
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* \param[in] ts_end Timestamp for the end of this frame
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* \param[in] flags Flags set on this frame
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* \param[in] active_map Map that specifies which macroblock is active
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*/
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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,
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#if CONFIG_VP9_HIGHBITDEPTH
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int use_highbitdepth,
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#endif
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vpx_enc_frame_flags_t flags);
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/**\brief Get the next source buffer to encode
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*
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*
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* \param[in] ctx Pointer to the lookahead context
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* \param[in] drain Flag indicating the buffer should be drained
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* (return a buffer regardless of the current queue depth)
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*
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* \retval NULL, if drain set and queue is empty
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* \retval NULL, if drain not set and queue not of the configured depth
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*/
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struct lookahead_entry *vp9_lookahead_pop(struct lookahead_ctx *ctx, int drain);
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/**\brief Get a future source buffer to encode
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*
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* \param[in] ctx Pointer to the lookahead context
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* \param[in] index Index of the frame to be returned, 0 == next frame
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*
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* \retval NULL, if no buffer exists at the specified index
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*/
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struct lookahead_entry *vp9_lookahead_peek(struct lookahead_ctx *ctx,
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int index);
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/**\brief Get the number of frames currently in the lookahead queue
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*
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* \param[in] ctx Pointer to the lookahead context
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*/
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unsigned int vp9_lookahead_depth(struct lookahead_ctx *ctx);
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#ifdef __cplusplus
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} // extern "C"
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#endif
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#endif // VP9_ENCODER_VP9_LOOKAHEAD_H_
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