chromium/third_party/libaom/source/libaom/av1/encoder/lookahead.h

/*
 * 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.
 */

/*!\file
 * \brief Describes look ahead buffer operations.
 */
#ifndef AOM_AV1_ENCODER_LOOKAHEAD_H_
#define AOM_AV1_ENCODER_LOOKAHEAD_H_

#include <stdbool.h>

#include "aom_scale/yv12config.h"
#include "aom/aom_integer.h"

#ifdef __cplusplus
extern "C" {
#endif

/*!\cond */
#define MAX_LAG_BUFFERS …
#define MAX_LAP_BUFFERS …
#define MAX_TOTAL_BUFFERS …
#define LAP_LAG_IN_FRAMES …

struct lookahead_entry { … };

// The max of past frames we want to keep in the queue.
#define MAX_PRE_FRAMES …

enum { … } UENUM1BYTE(…) …;

struct read_ctx { … };

struct lookahead_ctx { … };
/*!\endcond */

/**\brief Initializes the lookahead stage
 *
 * The lookahead stage is a queue of frame buffers on which some analysis
 * may be done when buffers are enqueued.
 */
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,
    const int border_in_pixels, int byte_alignment, int num_lap_buffers,
    bool is_all_intra, bool alloc_pyramid);

/**\brief Destroys the lookahead stage
 */
void av1_lookahead_destroy(struct lookahead_ctx *ctx);

/**\brief Check if lookahead buffer is full
 */
int av1_lookahead_full(const struct lookahead_ctx *ctx);

/**\brief Enqueue a source buffer
 *
 * This function will copy the source image into a new framebuffer with
 * the expected stride/border.
 *
 * \param[in] ctx               Pointer to the lookahead context
 * \param[in] src               Pointer to the image to enqueue
 * \param[in] ts_start          Timestamp for the start of this frame
 * \param[in] ts_end            Timestamp for the end of this frame
 * \param[in] use_highbitdepth  Tell if HBD is used
 * \param[in] alloc_pyramid     Whether to allocate a downsampling pyramid
 *                              for each frame buffer
 * \param[in] flags             Flags set on this frame
 */
int av1_lookahead_push(struct lookahead_ctx *ctx, const YV12_BUFFER_CONFIG *src,
                       int64_t ts_start, int64_t ts_end, int use_highbitdepth,
                       bool alloc_pyramid, aom_enc_frame_flags_t flags);

/**\brief Get the next source buffer to encode
 *
 * \param[in] ctx       Pointer to the lookahead context
 * \param[in] drain     Flag indicating the buffer should be drained
 *                      (return a buffer regardless of the current queue depth)
 * \param[in] stage     Encoder stage
 *
 * \retval Return NULL, if drain set and queue is empty, or if drain not set and
 * queue not of the configured depth.
 */
struct lookahead_entry *av1_lookahead_pop(struct lookahead_ctx *ctx, int drain,
                                          COMPRESSOR_STAGE stage);

/**\brief Get a future source buffer to encode
 *
 * \param[in] ctx       Pointer to the lookahead context
 * \param[in] index     Index of the frame to be returned, 0 == next frame
 * \param[in] stage     Encoder stage
 *
 * \retval Return NULL, if no buffer exists at the specified index
 */
struct lookahead_entry *av1_lookahead_peek(struct lookahead_ctx *ctx, int index,
                                           COMPRESSOR_STAGE stage);

/**\brief Get the number of frames currently in the lookahead queue
 */
unsigned int av1_lookahead_depth(struct lookahead_ctx *ctx,
                                 COMPRESSOR_STAGE stage);

/**\brief Get pop_sz value
 */
int av1_lookahead_pop_sz(struct lookahead_ctx *ctx, COMPRESSOR_STAGE stage);

#ifdef __cplusplus
}  // extern "C"
#endif

#endif  // AOM_AV1_ENCODER_LOOKAHEAD_H_