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520 lines
16 KiB
C
520 lines
16 KiB
C
/*
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* Copyright (c) 2020 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 VPX_VPX_VPX_EXT_RATECTRL_H_
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#define VPX_VPX_VPX_EXT_RATECTRL_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include "./vpx_integer.h"
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/*!\brief Current ABI version number
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*
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* \internal
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* If this file is altered in any way that changes the ABI, this value
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* must be bumped. Examples include, but are not limited to, changing
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* types, removing or reassigning enums, adding/removing/rearranging
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* fields to structures.
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*/
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#define VPX_EXT_RATECTRL_ABI_VERSION (6)
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/*!\brief The control type of the inference API.
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* In VPX_RC_QP mode, the external rate control model determines the
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* quantization parameter (QP) for each frame.
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* In VPX_RC_GOP mode, the external rate control model determines the
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* group of picture (GOP) of the video sequence.
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* In VPX_RC_RDMULT mode, the external rate control model determines the
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* rate-distortion multiplier (rdmult) for the current frame.
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* In VPX_RC_GOP_QP mode, the external rate control model determines
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* both the QP and the GOP.
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* In VPX_RC_GOP_QP_RDMULT mode, the external rate control model determines
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* the QP, GOP and the rdmult.
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*/
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typedef enum vpx_rc_type {
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VPX_RC_QP = 1 << 0,
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VPX_RC_GOP = 1 << 1,
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VPX_RC_RDMULT = 1 << 2,
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VPX_RC_GOP_QP = VPX_RC_QP | VPX_RC_GOP,
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VPX_RC_GOP_QP_RDMULT = VPX_RC_QP | VPX_RC_GOP | VPX_RC_RDMULT
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} vpx_rc_type_t;
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/*!\brief Abstract rate control model handler
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*
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* The encoder will receive the model handler from create_model() defined in
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* vpx_rc_funcs_t.
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*/
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typedef void *vpx_rc_model_t;
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/*!\brief A reserved value for the q index.
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* If the external rate control model returns this value,
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* the encoder will use the default q selected by libvpx's rate control
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* system.
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*/
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#define VPX_DEFAULT_Q -1
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/*!\brief A reserved value for the rdmult.
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* If the external rate control model returns this value,
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* the encoder will use the default rdmult selected by libvpx's rate control
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* system.
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*/
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#define VPX_DEFAULT_RDMULT -1
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/*!\brief Encode frame decision made by the external rate control model
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*
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* The encoder will receive the decision from the external rate control model
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* through get_encodeframe_decision() defined in vpx_rc_funcs_t.
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*
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* If q_index = VPX_DEFAULT_Q, the encoder will use libvpx's default q.
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*
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* If max_frame_size = 0, the encoding ignores max frame size limit.
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* If max_frame_size = -1, the encoding uses VP9's max frame size as the limit.
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* If the encoded frame size is larger than max_frame_size, the frame is
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* recoded to meet the size limit, following VP9's recoding principles.
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*/
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typedef struct vpx_rc_encodeframe_decision {
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int q_index; /**< Quantizer step index [0..255]*/
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int max_frame_size; /**< Maximal frame size allowed to encode a frame*/
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} vpx_rc_encodeframe_decision_t;
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/*!\brief Information for the frame to be encoded.
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*
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* The encoder will send the information to external rate control model through
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* get_encodeframe_decision() defined in vpx_rc_funcs_t.
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*
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*/
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typedef struct vpx_rc_encodeframe_info {
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/*!
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* 0: Key frame
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* 1: Inter frame
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* 2: Alternate reference frame
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* 3: Overlay frame
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* 4: Golden frame
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*/
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int frame_type;
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int show_index; /**< display index, starts from zero*/
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int coding_index; /**< coding index, starts from zero*/
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/*!
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* index of the current frame in this group of picture, starts from zero.
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*/
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int gop_index;
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int ref_frame_coding_indexes[3]; /**< three reference frames' coding indices*/
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/*!
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* The validity of the three reference frames.
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* 0: Invalid
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* 1: Valid
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*/
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int ref_frame_valid_list[3];
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/*!
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* The length of the current GOP.
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*/
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int gop_size;
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/*!
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* Whether the current GOP uses an alt ref.
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*/
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int use_alt_ref;
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} vpx_rc_encodeframe_info_t;
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/*!\brief Frame coding result
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*
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* The encoder will send the result to the external rate control model through
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* update_encodeframe_result() defined in vpx_rc_funcs_t.
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*/
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typedef struct vpx_rc_encodeframe_result {
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int64_t sse; /**< sum of squared error of the reconstructed frame */
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int64_t bit_count; /**< number of bits spent on coding the frame*/
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int64_t pixel_count; /**< number of pixels in YUV planes of the frame*/
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int actual_encoding_qindex; /**< the actual qindex used to encode the frame*/
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} vpx_rc_encodeframe_result_t;
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/*!\brief Status returned by rate control callback functions.
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*/
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typedef enum vpx_rc_status {
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VPX_RC_OK = 0,
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VPX_RC_ERROR = 1,
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} vpx_rc_status_t;
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/*!\brief First pass frame stats
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* This is a mirror of vp9's FIRSTPASS_STATS except that spatial_layer_id is
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* omitted
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*/
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typedef struct vpx_rc_frame_stats {
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/*!
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* Frame number in display order, if stats are for a single frame.
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* No real meaning for a collection of frames.
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*/
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double frame;
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/*!
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* Weight assigned to this frame (or total weight for the collection of
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* frames) currently based on intra factor and brightness factor. This is used
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* to distribute bits between easier and harder frames.
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*/
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double weight;
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/*!
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* Intra prediction error.
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*/
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double intra_error;
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/*!
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* Best of intra pred error and inter pred error using last frame as ref.
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*/
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double coded_error;
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/*!
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* Best of intra pred error and inter pred error using golden frame as ref.
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*/
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double sr_coded_error;
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/*!
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* Estimate the noise energy of the current frame.
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*/
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double frame_noise_energy;
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/*!
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* Percentage of blocks with inter pred error < intra pred error.
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*/
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double pcnt_inter;
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/*!
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* Percentage of blocks using (inter prediction and) non-zero motion vectors.
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*/
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double pcnt_motion;
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/*!
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* Percentage of blocks where golden frame was better than last or intra:
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* inter pred error using golden frame < inter pred error using last frame and
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* inter pred error using golden frame < intra pred error
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*/
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double pcnt_second_ref;
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/*!
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* Percentage of blocks where intra and inter prediction errors were very
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* close.
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*/
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double pcnt_neutral;
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/*!
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* Percentage of blocks that have intra error < inter error and inter error <
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* LOW_I_THRESH
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* - bit_depth 8: LOW_I_THRESH = 24000
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* - bit_depth 10: LOW_I_THRESH = 24000 << 4
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* - bit_depth 12: LOW_I_THRESH = 24000 << 8
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*/
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double pcnt_intra_low;
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/*!
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* Percentage of blocks that have intra error < inter error and intra error <
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* LOW_I_THRESH but inter error >= LOW_I_THRESH LOW_I_THRESH
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* - bit_depth 8: LOW_I_THRESH = 24000
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* - bit_depth 10: LOW_I_THRESH = 24000 << 4
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* - bit_depth 12: LOW_I_THRESH = 24000 << 8
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*/
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double pcnt_intra_high;
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/*!
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* Percentage of blocks that have almost no intra error residual
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* (i.e. are in effect completely flat and untextured in the intra
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* domain). In natural videos this is uncommon, but it is much more
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* common in animations, graphics and screen content, so may be used
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* as a signal to detect these types of content.
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*/
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double intra_skip_pct;
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/*!
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* Percentage of blocks that have intra error < SMOOTH_INTRA_THRESH
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* - bit_depth 8: SMOOTH_INTRA_THRESH = 4000
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* - bit_depth 10: SMOOTH_INTRA_THRESH = 4000 << 4
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* - bit_depth 12: SMOOTH_INTRA_THRESH = 4000 << 8
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*/
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double intra_smooth_pct;
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/*!
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* Image mask rows top and bottom.
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*/
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double inactive_zone_rows;
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/*!
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* Image mask columns at left and right edges.
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*/
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double inactive_zone_cols;
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/*!
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* Mean of row motion vectors.
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*/
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double MVr;
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/*!
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* Mean of absolute value of row motion vectors.
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*/
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double mvr_abs;
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/*!
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* Mean of column motion vectors.
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*/
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double MVc;
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/*!
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* Mean of absolute value of column motion vectors.
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*/
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double mvc_abs;
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/*!
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* Variance of row motion vectors.
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*/
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double MVrv;
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/*!
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* Variance of column motion vectors.
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*/
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double MVcv;
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/*!
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* Value in range [-1,1] indicating fraction of row and column motion vectors
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* that point inwards (negative MV value) or outwards (positive MV value).
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* For example, value of 1 indicates, all row/column MVs are inwards.
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*/
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double mv_in_out_count;
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/*!
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* Duration of the frame / collection of frames.
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*/
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double duration;
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/*!
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* 1.0 if stats are for a single frame, or
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* number of frames whose stats are accumulated.
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*/
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double count;
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} vpx_rc_frame_stats_t;
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/*!\brief Collection of first pass frame stats
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*/
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typedef struct vpx_rc_firstpass_stats {
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/*!
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* Pointer to first pass frame stats.
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* The pointed array of vpx_rc_frame_stats_t should have length equal to
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* number of show frames in the video.
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*/
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vpx_rc_frame_stats_t *frame_stats;
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/*!
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* Number of show frames in the video.
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*/
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int num_frames;
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} vpx_rc_firstpass_stats_t;
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/*!\brief Encode config sent to external rate control model
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*/
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typedef struct vpx_rc_config {
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int frame_width; /**< frame width */
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int frame_height; /**< frame height */
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int show_frame_count; /**< number of visible frames in the video */
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/*!
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* Target bitrate in kilobytes per second
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*/
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int target_bitrate_kbps;
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int frame_rate_num; /**< numerator of frame rate */
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int frame_rate_den; /**< denominator of frame rate */
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} vpx_rc_config_t;
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/*!\brief Information passed to the external rate control model to
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* help make GOP decisions.
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*/
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typedef struct vpx_rc_gop_info {
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/*!
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* Minimum allowed gf interval, fixed for the whole clip.
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* Note that it will be modified to match vp9's level constraints
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* in the encoder.
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* The level constraint is defined in vp9_encoder.c:
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* const Vp9LevelSpec vp9_level_defs[VP9_LEVELS].
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*/
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int min_gf_interval;
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/*!
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* Maximum allowed gf interval, fixed for the whole clip.
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*/
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int max_gf_interval;
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/*!
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* Minimum allowed gf interval for the current GOP, determined
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* by the encoder.
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*/
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int active_min_gf_interval;
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/*!
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* Maximum allowed gf interval for the current GOP, determined
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* by the encoder.
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*/
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int active_max_gf_interval;
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/*!
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* Whether to allow the use of alt ref, determined by the encoder.
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* It is fixed for the entire encode.
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* See function "is_altref_enabled" in vp9_encoder.h.
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*/
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int allow_alt_ref;
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/*!
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* Is the current frame a key frame.
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*/
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int is_key_frame;
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/*!
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* Does the previous gop use alt ref or not.
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*/
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int last_gop_use_alt_ref;
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/*!
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* Current frame distance to the last keyframe, e.g., if Nth frame is a key,
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* then the value of the N+1 th frame is 1.
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*/
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int frames_since_key;
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/*!
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* Current frame distance to the next keyframe, e.g. if Nth frame is a key,
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* then the value of frame N - 1 is 1.
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*/
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int frames_to_key;
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/*!
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* Number of lookahead source frames.
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*/
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int lag_in_frames;
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/*!
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* Display index (temporal stamp) of this frame in the whole clip,
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* starts from zero.
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*/
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int show_index;
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/*!
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* Coding index of this frame in the whole clip, starts from zero.
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*/
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int coding_index;
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/*!
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* The index of the current gop, starts from zero, resets to zero
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* when a keyframe is set.
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*/
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int gop_global_index;
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} vpx_rc_gop_info_t;
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/*!\brief The decision made by the external rate control model to set the
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* group of picture.
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*/
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typedef struct vpx_rc_gop_decision {
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int gop_coding_frames; /**< The number of frames of this GOP */
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int use_alt_ref; /**< Whether to use alt ref for this GOP */
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} vpx_rc_gop_decision_t;
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/*!\brief Create an external rate control model callback prototype
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*
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* This callback is invoked by the encoder to create an external rate control
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* model.
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*
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* \param[in] priv Callback's private data
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* \param[in] ratectrl_config Pointer to vpx_rc_config_t
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* \param[out] rate_ctrl_model_pt Pointer to vpx_rc_model_t
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*/
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typedef vpx_rc_status_t (*vpx_rc_create_model_cb_fn_t)(
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void *priv, const vpx_rc_config_t *ratectrl_config,
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vpx_rc_model_t *rate_ctrl_model_pt);
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/*!\brief Send first pass stats to the external rate control model callback
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* prototype
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*
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* This callback is invoked by the encoder to send first pass stats to the
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* external rate control model.
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*
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* \param[in] rate_ctrl_model rate control model
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* \param[in] first_pass_stats first pass stats
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*/
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typedef vpx_rc_status_t (*vpx_rc_send_firstpass_stats_cb_fn_t)(
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vpx_rc_model_t rate_ctrl_model,
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const vpx_rc_firstpass_stats_t *first_pass_stats);
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/*!\brief Receive encode frame decision callback prototype
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*
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* This callback is invoked by the encoder to receive encode frame decision from
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* the external rate control model.
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*
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* \param[in] rate_ctrl_model rate control model
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* \param[in] encode_frame_info information of the coding frame
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* \param[out] frame_decision encode decision of the coding frame
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*/
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typedef vpx_rc_status_t (*vpx_rc_get_encodeframe_decision_cb_fn_t)(
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vpx_rc_model_t rate_ctrl_model,
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const vpx_rc_encodeframe_info_t *encode_frame_info,
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vpx_rc_encodeframe_decision_t *frame_decision);
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/*!\brief Update encode frame result callback prototype
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*
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* This callback is invoked by the encoder to update encode frame result to the
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* external rate control model.
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*
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* \param[in] rate_ctrl_model rate control model
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* \param[out] encode_frame_result encode result of the coding frame
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*/
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typedef vpx_rc_status_t (*vpx_rc_update_encodeframe_result_cb_fn_t)(
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vpx_rc_model_t rate_ctrl_model,
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const vpx_rc_encodeframe_result_t *encode_frame_result);
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/*!\brief Get the GOP structure from the external rate control model.
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*
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* This callback is invoked by the encoder to get GOP decisions from
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* the external rate control model.
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*
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* \param[in] rate_ctrl_model rate control model
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* \param[in] gop_info information collected from the encoder
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* \param[out] gop_decision GOP decision from the model
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*/
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typedef vpx_rc_status_t (*vpx_rc_get_gop_decision_cb_fn_t)(
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vpx_rc_model_t rate_ctrl_model, const vpx_rc_gop_info_t *gop_info,
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vpx_rc_gop_decision_t *gop_decision);
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/*!\brief Get the frame rdmult from the external rate control model.
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*
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* This callback is invoked by the encoder to get rdmult from
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* the external rate control model.
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*
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* \param[in] rate_ctrl_model rate control model
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* \param[in] frame_info information collected from the encoder
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* \param[out] rdmult frame rate-distortion multiplier from the model
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*/
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typedef vpx_rc_status_t (*vpx_rc_get_frame_rdmult_cb_fn_t)(
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vpx_rc_model_t rate_ctrl_model, const vpx_rc_encodeframe_info_t *frame_info,
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int *rdmult);
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/*!\brief Delete the external rate control model callback prototype
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*
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* This callback is invoked by the encoder to delete the external rate control
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* model.
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*
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* \param[in] rate_ctrl_model rate control model
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*/
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typedef vpx_rc_status_t (*vpx_rc_delete_model_cb_fn_t)(
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vpx_rc_model_t rate_ctrl_model);
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/*!\brief Callback function set for external rate control.
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*
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* The user can enable external rate control by registering
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* a set of callback functions with the codec control flag
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* VP9E_SET_EXTERNAL_RATE_CONTROL.
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*/
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typedef struct vpx_rc_funcs {
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/*!
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* The rate control type of this API.
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*/
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vpx_rc_type_t rc_type;
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/*!
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* Create an external rate control model.
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*/
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vpx_rc_create_model_cb_fn_t create_model;
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/*!
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* Send first pass stats to the external rate control model.
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*/
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vpx_rc_send_firstpass_stats_cb_fn_t send_firstpass_stats;
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/*!
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* Get encodeframe decision from the external rate control model.
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*/
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vpx_rc_get_encodeframe_decision_cb_fn_t get_encodeframe_decision;
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/*!
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* Update encodeframe result to the external rate control model.
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*/
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vpx_rc_update_encodeframe_result_cb_fn_t update_encodeframe_result;
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/*!
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* Get GOP decisions from the external rate control model.
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*/
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vpx_rc_get_gop_decision_cb_fn_t get_gop_decision;
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/*!
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* Get rdmult for the frame from the external rate control model.
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*/
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vpx_rc_get_frame_rdmult_cb_fn_t get_frame_rdmult;
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/*!
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* Delete the external rate control model.
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*/
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vpx_rc_delete_model_cb_fn_t delete_model;
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/*!
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* Private data for the external rate control model.
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*/
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void *priv;
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} vpx_rc_funcs_t;
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#ifdef __cplusplus
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} // extern "C"
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#endif
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#endif // VPX_VPX_VPX_EXT_RATECTRL_H_
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