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/*
* Copyright (c) 2021, Alliance for Open Media. All rights reserved
*
* This source code is subject to the terms of the BSD 3-Clause Clear License
* and the Alliance for Open Media Patent License 1.0. If the BSD 3-Clause Clear
* License was not distributed with this source code in the LICENSE file, you
* can obtain it at aomedia.org/license/software-license/bsd-3-c-c/. 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
* aomedia.org/license/patent-license/.
*/
#ifndef AOM_AV1_ENCODER_FIRSTPASS_H_
#define AOM_AV1_ENCODER_FIRSTPASS_H_
#include "av1/common/av1_common_int.h"
#include "av1/common/enums.h"
#include "av1/encoder/lookahead.h"
#include "av1/encoder/ratectrl.h"
#ifdef __cplusplus
extern "C" {
#endif
#define DOUBLE_DIVIDE_CHECK(x) ((x) < 0 ? (x)-0.000001 : (x) + 0.000001)
#define MIN_ZERO_MOTION 0.95
#define MAX_SR_CODED_ERROR 40
#define MAX_RAW_ERR_VAR 2000
#define MIN_MV_IN_OUT 0.4
#define VLOW_MOTION_THRESHOLD 950
// size of firstpass macroblocks in terms of MIs.
#define FP_MIB_SIZE 4
#define FP_MIB_SIZE_LOG2 2
/*!
* \brief The stucture of acummulated frame stats in the first pass.
*/
typedef struct {
/*!
* Frame number in display order, if stats are for a single frame.
* No real meaning for a collection of frames.
*/
double frame;
/*!
* Weight assigned to this frame (or total weight for the collection of
* frames) currently based on intra factor and brightness factor. This is used
* to distribute bits betweeen easier and harder frames.
*/
double weight;
/*!
* Intra prediction error.
*/
double intra_error;
/*!
* Average wavelet energy computed using Discrete Wavelet Transform (DWT).
*/
double frame_avg_wavelet_energy;
/*!
* Best of intra pred error and inter pred error using last frame as ref.
*/
double coded_error;
/*!
* Best of intra pred error and inter pred error using golden frame as ref.
*/
double sr_coded_error;
/*!
* Best of intra pred error and inter pred error using altref frame as ref.
*/
double tr_coded_error;
/*!
* Percentage of blocks with inter pred error < intra pred error.
*/
double pcnt_inter;
/*!
* Percentage of blocks using (inter prediction and) non-zero motion vectors.
*/
double pcnt_motion;
/*!
* Percentage of blocks where golden frame was better than last or intra:
* inter pred error using golden frame < inter pred error using last frame and
* inter pred error using golden frame < intra pred error
*/
double pcnt_second_ref;
/*!
* Percentage of blocks where altref frame was better than intra, last, golden
*/
double pcnt_third_ref;
/*!
* Percentage of blocks where intra and inter prediction errors were very
* close. Note that this is a 'weighted count', that is, the so blocks may be
* weighted by how close the two errors were.
*/
double pcnt_neutral;
/*!
* Percentage of blocks that have almost no intra error residual
* (i.e. are in effect completely flat and untextured in the intra
* domain). In natural videos this is uncommon, but it is much more
* common in animations, graphics and screen content, so may be used
* as a signal to detect these types of content.
*/
double intra_skip_pct;
/*!
* Image mask rows top and bottom.
*/
double inactive_zone_rows;
/*!
* Image mask columns at left and right edges.
*/
double inactive_zone_cols;
/*!
* Average of row motion vectors.
*/
double MVr;
/*!
* Mean of absolute value of row motion vectors.
*/
double mvr_abs;
/*!
* Mean of column motion vectors.
*/
double MVc;
/*!
* Mean of absolute value of column motion vectors.
*/
double mvc_abs;
/*!
* Variance of row motion vectors.
*/
double MVrv;
/*!
* Variance of column motion vectors.
*/
double MVcv;
/*!
* Value in range [-1,1] indicating fraction of row and column motion vectors
* that point inwards (negative MV value) or outwards (positive MV value).
* For example, value of 1 indicates, all row/column MVs are inwards.
*/
double mv_in_out_count;
/*!
* Count of unique non-zero motion vectors.
*/
double new_mv_count;
/*!
* Duration of the frame / collection of frames.
*/
double duration;
/*!
* 1.0 if stats are for a single frame, OR
* Number of frames in this collection for which the stats are accumulated.
*/
double count;
/*!
* standard deviation for (0, 0) motion prediction error
*/
double raw_error_stdev;
} FIRSTPASS_STATS;
/*!\cond */
#define FC_HIGHMOTION_THRESH 0.15
enum {
FC_NORMAL = 0,
FC_HIGHMOTION = 1,
FRAME_CONTENT_TYPES = 2
} UENUM1BYTE(FRAME_CONTENT_TYPE);
typedef struct {
FIRSTPASS_STATS *stats_in_start;
FIRSTPASS_STATS *stats_in_end;
FIRSTPASS_STATS *stats_in_buf_end;
FIRSTPASS_STATS *total_stats;
FIRSTPASS_STATS *total_left_stats;
} STATS_BUFFER_CTX;
/*!\endcond */
/*!
* \brief Two pass status and control data.
*/
typedef struct {
/*!\cond */
unsigned int section_intra_rating;
// Circular queue of first pass stats stored for most recent frames.
// cpi->output_pkt_list[i].data.twopass_stats.buf points to actual data stored
// here.
FIRSTPASS_STATS *frame_stats_arr[MAX_LAP_BUFFERS + 1];
int frame_stats_next_idx; // Index to next unused element in frame_stats_arr.
const FIRSTPASS_STATS *stats_in;
STATS_BUFFER_CTX *stats_buf_ctx;
int first_pass_done;
int64_t bits_left;
double modified_error_min;
double modified_error_max;
double modified_error_left;
double mb_av_energy;
double frame_avg_haar_energy;
// An indication of the content type of the current frame
FRAME_CONTENT_TYPE fr_content_type;
// Projected total bits available for a key frame group of frames
int64_t kf_group_bits;
// Error score of frames still to be coded in kf group
int64_t kf_group_error_left;
// Over time correction for bits per macro block estimation
double bpm_factor;
// Record of target and actual bits spent in current ARF group
int rolling_arf_group_target_bits;
int rolling_arf_group_actual_bits;
int sr_update_lag;
int kf_zeromotion_pct;
int last_kfgroup_zeromotion_pct;
int extend_minq;
int extend_maxq;
int extend_minq_fast;
/*!\endcond */
} TWO_PASS;
/*!\cond */
// This structure contains several key parameters to be accumulated for this
// frame.
typedef struct {
// Intra prediction error.
int64_t intra_error;
// Average wavelet energy computed using Discrete Wavelet Transform (DWT).
int64_t frame_avg_wavelet_energy;
// Best of intra pred error and inter pred error using last frame as ref.
int64_t coded_error;
// Best of intra pred error and inter pred error using golden frame as ref.
int64_t sr_coded_error;
// Best of intra pred error and inter pred error using altref frame as ref.
int64_t tr_coded_error;
// Count of motion vector.
int mv_count;
// Count of blocks that pick inter prediction (inter pred error is smaller
// than intra pred error).
int inter_count;
// Count of blocks that pick second ref (golden frame).
int second_ref_count;
// Count of blocks that pick third ref (altref frame).
int third_ref_count;
// Count of blocks where the inter and intra are very close and very low.
double neutral_count;
// Count of blocks where intra error is very small.
int intra_skip_count;
// Start row.
int image_data_start_row;
// Count of unique non-zero motion vectors.
int new_mv_count;
// Sum of inward motion vectors.
int sum_in_vectors;
// Sum of motion vector row.
int sum_mvr;
// Sum of motion vector column.
int sum_mvc;
// Sum of absolute value of motion vector row.
int sum_mvr_abs;
// Sum of absolute value of motion vector column.
int sum_mvc_abs;
// Sum of the square of motion vector row.
int64_t sum_mvrs;
// Sum of the square of motion vector column.
int64_t sum_mvcs;
// A factor calculated using intra pred error.
double intra_factor;
// A factor that measures brightness.
double brightness_factor;
} FRAME_STATS;
// This structure contains first pass data.
typedef struct {
// Buffer holding frame stats for all MACROBLOCKs.
// mb_stats[i] stores the FRAME_STATS of the ith
// MB in raster scan order.
FRAME_STATS *mb_stats;
// Buffer to store the prediction error of the (0,0) motion
// vector using the last source frame as the reference.
// raw_motion_err_list[i] stores the raw_motion_err of
// the ith MB in raster scan order.
int *raw_motion_err_list;
} FirstPassData;
struct AV1_COMP;
struct EncodeFrameParams;
struct AV1EncoderConfig;
struct TileDataEnc;
int av1_get_mb_rows_in_tile(TileInfo tile);
int av1_get_mb_cols_in_tile(TileInfo tile);
void av1_rc_get_first_pass_params(struct AV1_COMP *cpi);
void av1_first_pass_row(struct AV1_COMP *cpi, struct ThreadData *td,
struct TileDataEnc *tile_data, int mb_row);
void av1_end_first_pass(struct AV1_COMP *cpi);
void av1_twopass_zero_stats(FIRSTPASS_STATS *section);
void av1_accumulate_stats(FIRSTPASS_STATS *section,
const FIRSTPASS_STATS *frame);
/*!\endcond */
/*!\brief AV1 first pass encoding.
*
* \ingroup rate_control
* This function is the first encoding pass for the two pass encoding mode.
* It encodes the whole video and collect essential information.
* Two pass encoding is an encoding mode in the reference software (libaom)
* of AV1 for high performance encoding. The first pass is a fast encoding
* process to collect essential information to help the second pass make
* encoding decisions and improve coding quality. The collected stats is used
* in rate control, for example, to determine frame cut, the position of
* alternative reference frame (ARF), etc.
*
* \param[in] cpi Top-level encoder structure
* \param[in] ts_duration Duration of the frame / collection of frames
*
* Nothing is returned. Instead, the "TWO_PASS" structure inside "cpi"
* is modified to store information computed in this function.
*/
void av1_first_pass(struct AV1_COMP *cpi, const int64_t ts_duration);
#ifdef __cplusplus
} // extern "C"
#endif
#endif // AOM_AV1_ENCODER_FIRSTPASS_H_