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Import aom library
This is the reference implementation for the Alliance for Open Media's av1 video code. The commit used was 4d668d7feb1f8abd809d1bca0418570a7f142a36.
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trav90
Roy Tam
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third_party/aom/av1/encoder/ratectrl_xiph.h
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third_party/aom/av1/encoder/ratectrl_xiph.h
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/*
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* Copyright (c) 2001-2017, Alliance for Open Media. All rights reserved
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*
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* This source code is subject to the terms of the BSD 2 Clause License and
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* the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
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* was not distributed with this source code in the LICENSE file, you can
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* obtain it at www.aomedia.org/license/software. If the Alliance for Open
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* Media Patent License 1.0 was not distributed with this source code in the
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* PATENTS file, you can obtain it at www.aomedia.org/license/patent.
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*/
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#if !defined(_ratectrl_xiph_H)
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#define _ratectrl_xiph_H (1)
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#include "av1/encoder/ratectrl.h"
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#include "aom/internal/aom_codec_internal.h"
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/*Frame types.*/
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#define OD_I_FRAME (0)
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#define OD_P_FRAME (1)
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#define OD_GOLDEN_P_FRAME (2)
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#define OD_ALTREF_P_FRAME (3)
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#define OD_FRAME_NSUBTYPES (OD_ALTREF_P_FRAME + 1)
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/* Periodic boost (in between golden frames) strength - lower is more */
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#define OD_PERIODIC_BOOST_DIV (10)
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/* Constants for frame QP modulation <- tweak these
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* Adjusts how the rate control system decides the quantizers per frame
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* (sub)type */
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#define OD_MQP_I (0.98)
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#define OD_MQP_P (1.06)
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#define OD_MQP_GP (0.99)
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#define OD_MQP_AP (0.92)
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#define OD_DQP_I (-2)
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#define OD_DQP_P (0)
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#define OD_DQP_GP (-2)
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#define OD_DQP_AP (-2)
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/*Fractional_coded_quantizer ~=
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log2(quantizer / (1 << OD_COEFF_SHIFT))*6.307 + 6.235*/
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/*Base/scale factor for linear quantizer to fractional coded quantizer
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conversion (6.307 * 2^12) */
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#define OD_LOG_QUANTIZER_BASE_Q12 (0x0064EB)
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/*Inverse of above scale factor.*/
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#define OD_LOG_QUANTIZER_EXP_Q12 (0x000289)
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/*Offset for linear quantizer to fractional coded quantizer
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conversion (6.235 * 2^45) */
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#define OD_LOG_QUANTIZER_OFFSET_Q45 (0x0000C7851EB851ECLL)
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#define OD_RC_2PASS_MAGIC (0x53015641) /* [A, V, 1, S] in little endian */
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#define OD_RC_2PASS_SUMMARY_SZ (4 + 1 + (4 + 4 + 8) * OD_FRAME_NSUBTYPES)
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#define OD_RC_2PASS_PACKET_SZ (1 + 4)
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#define OD_RC_2PASS_MIN (OD_RC_2PASS_PACKET_SZ + OD_RC_2PASS_SUMMARY_SZ)
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#define OD_RC_2PASS_VERSION (1)
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/*A 2nd order low-pass Bessel follower.
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We use this for rate control because it has fast reaction time, but is
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critically damped.*/
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typedef struct od_iir_bessel2 {
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int32_t c[2];
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int64_t g;
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int32_t x[2];
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int32_t y[2];
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} od_iir_bessel2;
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/* The 2-pass metrics associated with a single frame. */
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typedef struct od_frame_metrics {
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/*The log base 2 of the scale factor for this frame in Q24 format.*/
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int64_t log_scale;
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/*The frame type from pass 1.*/
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unsigned frame_type : 1;
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} od_frame_metrics;
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/*Rate control setup and working state information.*/
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typedef struct od_rc_state {
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/* Image format */
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int frame_width;
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int frame_height;
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int bit_depth;
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/* Framerate */
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double framerate;
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/* Keyframe rate */
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int keyframe_rate;
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/* Golden frame period */
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int goldenframe_rate;
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/* Altref frame period */
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int altref_rate;
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/*The target bit-rate in bits per second.*/
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int64_t target_bitrate;
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/* Quality level for non-bitrate-targeting */
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int quality;
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/* Copied from oxcf->frame_periodic_boost */
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int periodic_boosts;
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/* Max Q */
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int maxq;
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/* Min Q */
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int minq;
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/* Quantizer to use for the first pass */
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int firstpass_quant;
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/* 2-pass metrics */
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od_frame_metrics cur_metrics;
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/* 2-pass state */
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int64_t scale_sum[OD_FRAME_NSUBTYPES];
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int nframes[OD_FRAME_NSUBTYPES];
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/* 2-pass bytestream reader/writer context */
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uint8_t *twopass_buffer;
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int twopass_buffer_bytes;
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/* Pass 1 stats packet storage */
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uint8_t firstpass_buffer[OD_RC_2PASS_SUMMARY_SZ];
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/* Every state packet from the first pass in a single buffer */
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uint8_t *twopass_allframes_buf;
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size_t twopass_allframes_buf_size;
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/* Actual returned quantizer */
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int target_quantizer;
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/*The full-precision, unmodulated quantizer upon which
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our modulated quantizers are based.*/
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int base_quantizer;
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/* Increments by 1 for each frame. */
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int64_t cur_frame;
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/* End of input flag */
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int end_of_input;
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/* Closed GOP flag */
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int closed_gop;
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/*The number of frames over which to distribute the reservoir usage.*/
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int reservoir_frame_delay;
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/*Will we drop frames to meet bitrate target?*/
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unsigned char drop_frames;
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/*Do we respect the maximum reservoir fullness?*/
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unsigned char cap_overflow;
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/*Can the reservoir go negative?*/
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unsigned char cap_underflow;
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/*Two-pass mode state.
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0 => 1-pass encoding.
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1 => 1st pass of 2-pass encoding.
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2 => 2nd pass of 2-pass encoding.*/
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int twopass_state;
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/*The log of the number of pixels in a frame in Q57 format.*/
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int64_t log_npixels;
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/*The target average bits per frame.*/
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int64_t bits_per_frame;
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/*The current bit reservoir fullness (bits available to be used).*/
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int64_t reservoir_fullness;
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/*The target buffer fullness.
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This is where we'd like to be by the last keyframe the appears in the next
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buf_delay frames.*/
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int64_t reservoir_target;
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/*The maximum buffer fullness (total size of the buffer).*/
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int64_t reservoir_max;
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/*The log of estimated scale factor for the rate model in Q57 format.*/
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int64_t log_scale[OD_FRAME_NSUBTYPES];
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/*The exponent used in the rate model in Q8 format.*/
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unsigned exp[OD_FRAME_NSUBTYPES];
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/*The log of an estimated scale factor used to obtain the real framerate, for
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VFR sources or, e.g., 12 fps content doubled to 24 fps, etc.*/
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int64_t log_drop_scale[OD_FRAME_NSUBTYPES];
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/*The total drop count from the previous frame.*/
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uint32_t prev_drop_count[OD_FRAME_NSUBTYPES];
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/*Second-order lowpass filters to track scale and VFR/drops.*/
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od_iir_bessel2 scalefilter[OD_FRAME_NSUBTYPES];
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od_iir_bessel2 vfrfilter[OD_FRAME_NSUBTYPES];
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int frame_count[OD_FRAME_NSUBTYPES];
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int inter_p_delay;
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int inter_delay_target;
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/*The total accumulated estimation bias.*/
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int64_t rate_bias;
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} od_rc_state;
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int od_enc_rc_init(od_rc_state *rc, int64_t bitrate, int delay_ms);
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int od_enc_rc_select_quantizers_and_lambdas(od_rc_state *rc,
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int is_golden_frame,
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int is_altref_frame, int frame_type,
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int *bottom_idx, int *top_idx);
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/* Returns 1 if the frame should be dropped */
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int od_enc_rc_update_state(od_rc_state *rc, int64_t bits, int is_golden_frame,
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int is_altref_frame, int frame_type, int droppable);
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int od_frame_type(od_rc_state *rc, int64_t coding_frame_count, int *is_golden,
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int *is_altref, int64_t *ip_count);
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int od_enc_rc_resize(od_rc_state *rc);
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int od_enc_rc_2pass_out(od_rc_state *rc, struct aom_codec_pkt_list *pkt_list,
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int summary);
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int od_enc_rc_2pass_in(od_rc_state *rc);
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#endif
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