xref: /aosp_15_r20/external/libaom/av1/encoder/gop_structure.h (revision 77c1e3ccc04c968bd2bc212e87364f250e820521)

/*
 * Copyright (c) 2019, 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.
 */

#ifndef AOM_AV1_ENCODER_GOP_STRUCTURE_H_
#define AOM_AV1_ENCODER_GOP_STRUCTURE_H_

#include "av1/common/av1_common_int.h"
#include "av1/encoder/ratectrl.h"

#ifdef __cplusplus
extern "C" {
#endif
/*!\cond */
struct AV1_COMP;
struct EncodeFrameParams;

#define MIN_ARF_GF_BOOST 240
#define NORMAL_BOOST 100

/*!\endcond */

/*!\brief Set up the Group-Of-Pictures structure for this GF_GROUP.
 *
 *\ingroup rate_control
 *
 * This function defines the Group-Of-Pictures structure for this GF_GROUP.
 * This involves deciding where to place the various FRAME_UPDATE_TYPEs in
 * the group. It does this primarily by updateing entries in
 * cpi->twopass.gf_group.update_type[].
 *
 * \param[in]    cpi          Top - level encoder instance structure
 *
 * \remark No return value but this function updates group data structures.
 */
void av1_gop_setup_structure(struct AV1_COMP *cpi);

/*!\brief Distributes bits to frames in a group
 *
 *\ingroup rate_control
 *
 * This function decides on the allocation of bits between the different
 * frames and types of frame in a GF/ARF group.
 *
 * \param[in]   cpi           Top - level encoder instance structure
 * \param[in]   rc            Rate control data
 * \param[in]   gf_group      GF/ARF group data structure
 * \param[in]   is_key_frame  Indicates if the first frame in the group is
 *                            also a key frame.
 * \param[in]   use_arf       Are ARF frames enabled or is this a GF only
 *                            uni-directional group.
 * \param[in]   gf_group_bits Bits available to be allocated.
 *
 * \remark No return but updates the rate control and group data structures
 *         to reflect the allocation of bits.
 */
void av1_gop_bit_allocation(const AV1_COMP *cpi, RATE_CONTROL *const rc,
                            GF_GROUP *gf_group, int is_key_frame, int use_arf,
                            int64_t gf_group_bits);

/*!\brief Check whether a frame in the GOP is a forward key frame
 *
 *\ingroup rate_control
 *
 * \param[in]   gf_group       GF/ARF group data structure
 * \param[in]   gf_frame_index GOP index
 *
 * \return Return 1 if it is a forward key frame, otherwise return 0
 */
int av1_gop_check_forward_keyframe(const GF_GROUP *gf_group,
                                   int gf_frame_index);

/*!\brief Check whether a frame in the GOP is the second arf
 *
 *\ingroup rate_control
 *
 * \param[in]   gf_group       GF/ARF group data structure
 * \param[in]   gf_frame_index GOP index
 *
 * \return Return 1 if it is the second arf
 */
int av1_gop_is_second_arf(const GF_GROUP *gf_group, int gf_frame_index);

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

#endif  // AOM_AV1_ENCODER_GOP_STRUCTURE_H_