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media/libvpx/vp8/encoder/ratectrl.c@ac0c01689b40 (annotated)

media/libvpx/vp8/encoder/ratectrl.c

Thu, 15 Jan 2015 15:59:08 +0100

author

Michael Schloh von Bennewitz <michael@schloh.com>

date

Thu, 15 Jan 2015 15:59:08 +0100

branch

TOR_BUG_9701

changeset 10

ac0c01689b40

permissions

-rw-r--r--

Implement a real Private Browsing Mode condition by changing the API/ABI;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

michael@0	1	/*
michael@0	2	* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
michael@0	3	*
michael@0	4	* Use of this source code is governed by a BSD-style license
michael@0	5	* that can be found in the LICENSE file in the root of the source
michael@0	6	* tree. An additional intellectual property rights grant can be found
michael@0	7	* in the file PATENTS. All contributing project authors may
michael@0	8	* be found in the AUTHORS file in the root of the source tree.
michael@0	9	*/
michael@0	10
michael@0	11
michael@0	12	#include <stdlib.h>
michael@0	13	#include <stdio.h>
michael@0	14	#include <string.h>
michael@0	15	#include <limits.h>
michael@0	16	#include <assert.h>
michael@0	17
michael@0	18	#include "math.h"
michael@0	19	#include "vp8/common/common.h"
michael@0	20	#include "ratectrl.h"
michael@0	21	#include "vp8/common/entropymode.h"
michael@0	22	#include "vpx_mem/vpx_mem.h"
michael@0	23	#include "vp8/common/systemdependent.h"
michael@0	24	#include "encodemv.h"
michael@0	25
michael@0	26
michael@0	27	#define MIN_BPB_FACTOR 0.01
michael@0	28	#define MAX_BPB_FACTOR 50
michael@0	29
michael@0	30	extern const MB_PREDICTION_MODE vp8_mode_order[MAX_MODES];
michael@0	31
michael@0	32
michael@0	33
michael@0	34	#ifdef MODE_STATS
michael@0	35	extern int y_modes[5];
michael@0	36	extern int uv_modes[4];
michael@0	37	extern int b_modes[10];
michael@0	38
michael@0	39	extern int inter_y_modes[10];
michael@0	40	extern int inter_uv_modes[4];
michael@0	41	extern int inter_b_modes[10];
michael@0	42	#endif
michael@0	43
michael@0	44	/* Bits Per MB at different Q (Multiplied by 512) */
michael@0	45	#define BPER_MB_NORMBITS 9
michael@0	46
michael@0	47	/* Work in progress recalibration of baseline rate tables based on
michael@0	48	* the assumption that bits per mb is inversely proportional to the
michael@0	49	* quantizer value.
michael@0	50	*/
michael@0	51	const int vp8_bits_per_mb[2][QINDEX_RANGE] =
michael@0	52	{
michael@0	53	/* Intra case 450000/Qintra */
michael@0	54	{
michael@0	55	1125000,900000, 750000, 642857, 562500, 500000, 450000, 450000,
michael@0	56	409090, 375000, 346153, 321428, 300000, 281250, 264705, 264705,
michael@0	57	250000, 236842, 225000, 225000, 214285, 214285, 204545, 204545,
michael@0	58	195652, 195652, 187500, 180000, 180000, 173076, 166666, 160714,
michael@0	59	155172, 150000, 145161, 140625, 136363, 132352, 128571, 125000,
michael@0	60	121621, 121621, 118421, 115384, 112500, 109756, 107142, 104651,
michael@0	61	102272, 100000, 97826, 97826, 95744, 93750, 91836, 90000,
michael@0	62	88235, 86538, 84905, 83333, 81818, 80357, 78947, 77586,
michael@0	63	76271, 75000, 73770, 72580, 71428, 70312, 69230, 68181,
michael@0	64	67164, 66176, 65217, 64285, 63380, 62500, 61643, 60810,
michael@0	65	60000, 59210, 59210, 58441, 57692, 56962, 56250, 55555,
michael@0	66	54878, 54216, 53571, 52941, 52325, 51724, 51136, 50561,
michael@0	67	49450, 48387, 47368, 46875, 45918, 45000, 44554, 44117,
michael@0	68	43269, 42452, 41666, 40909, 40178, 39473, 38793, 38135,
michael@0	69	36885, 36290, 35714, 35156, 34615, 34090, 33582, 33088,
michael@0	70	32608, 32142, 31468, 31034, 30405, 29801, 29220, 28662,
michael@0	71	},
michael@0	72	/* Inter case 285000/Qinter */
michael@0	73	{
michael@0	74	712500, 570000, 475000, 407142, 356250, 316666, 285000, 259090,
michael@0	75	237500, 219230, 203571, 190000, 178125, 167647, 158333, 150000,
michael@0	76	142500, 135714, 129545, 123913, 118750, 114000, 109615, 105555,
michael@0	77	101785, 98275, 95000, 91935, 89062, 86363, 83823, 81428,
michael@0	78	79166, 77027, 75000, 73076, 71250, 69512, 67857, 66279,
michael@0	79	64772, 63333, 61956, 60638, 59375, 58163, 57000, 55882,
michael@0	80	54807, 53773, 52777, 51818, 50892, 50000, 49137, 47500,
michael@0	81	45967, 44531, 43181, 41911, 40714, 39583, 38513, 37500,
michael@0	82	36538, 35625, 34756, 33928, 33139, 32386, 31666, 30978,
michael@0	83	30319, 29687, 29081, 28500, 27941, 27403, 26886, 26388,
michael@0	84	25909, 25446, 25000, 24568, 23949, 23360, 22800, 22265,
michael@0	85	21755, 21268, 20802, 20357, 19930, 19520, 19127, 18750,
michael@0	86	18387, 18037, 17701, 17378, 17065, 16764, 16473, 16101,
michael@0	87	15745, 15405, 15079, 14766, 14467, 14179, 13902, 13636,
michael@0	88	13380, 13133, 12895, 12666, 12445, 12179, 11924, 11632,
michael@0	89	11445, 11220, 11003, 10795, 10594, 10401, 10215, 10035,
michael@0	90	}
michael@0	91	};
michael@0	92
michael@0	93	static const int kf_boost_qadjustment[QINDEX_RANGE] =
michael@0	94	{
michael@0	95	128, 129, 130, 131, 132, 133, 134, 135,
michael@0	96	136, 137, 138, 139, 140, 141, 142, 143,
michael@0	97	144, 145, 146, 147, 148, 149, 150, 151,
michael@0	98	152, 153, 154, 155, 156, 157, 158, 159,
michael@0	99	160, 161, 162, 163, 164, 165, 166, 167,
michael@0	100	168, 169, 170, 171, 172, 173, 174, 175,
michael@0	101	176, 177, 178, 179, 180, 181, 182, 183,
michael@0	102	184, 185, 186, 187, 188, 189, 190, 191,
michael@0	103	192, 193, 194, 195, 196, 197, 198, 199,
michael@0	104	200, 200, 201, 201, 202, 203, 203, 203,
michael@0	105	204, 204, 205, 205, 206, 206, 207, 207,
michael@0	106	208, 208, 209, 209, 210, 210, 211, 211,
michael@0	107	212, 212, 213, 213, 214, 214, 215, 215,
michael@0	108	216, 216, 217, 217, 218, 218, 219, 219,
michael@0	109	220, 220, 220, 220, 220, 220, 220, 220,
michael@0	110	220, 220, 220, 220, 220, 220, 220, 220,
michael@0	111	};
michael@0	112
michael@0	113	/* #define GFQ_ADJUSTMENT (Q+100) */
michael@0	114	#define GFQ_ADJUSTMENT vp8_gf_boost_qadjustment[Q]
michael@0	115	const int vp8_gf_boost_qadjustment[QINDEX_RANGE] =
michael@0	116	{
michael@0	117	80, 82, 84, 86, 88, 90, 92, 94,
michael@0	118	96, 97, 98, 99, 100, 101, 102, 103,
michael@0	119	104, 105, 106, 107, 108, 109, 110, 111,
michael@0	120	112, 113, 114, 115, 116, 117, 118, 119,
michael@0	121	120, 121, 122, 123, 124, 125, 126, 127,
michael@0	122	128, 129, 130, 131, 132, 133, 134, 135,
michael@0	123	136, 137, 138, 139, 140, 141, 142, 143,
michael@0	124	144, 145, 146, 147, 148, 149, 150, 151,
michael@0	125	152, 153, 154, 155, 156, 157, 158, 159,
michael@0	126	160, 161, 162, 163, 164, 165, 166, 167,
michael@0	127	168, 169, 170, 171, 172, 173, 174, 175,
michael@0	128	176, 177, 178, 179, 180, 181, 182, 183,
michael@0	129	184, 184, 185, 185, 186, 186, 187, 187,
michael@0	130	188, 188, 189, 189, 190, 190, 191, 191,
michael@0	131	192, 192, 193, 193, 194, 194, 194, 194,
michael@0	132	195, 195, 196, 196, 197, 197, 198, 198
michael@0	133	};
michael@0	134
michael@0	135	/*
michael@0	136	const int vp8_gf_boost_qadjustment[QINDEX_RANGE] =
michael@0	137	{
michael@0	138	100,101,102,103,104,105,105,106,
michael@0	139	106,107,107,108,109,109,110,111,
michael@0	140	112,113,114,115,116,117,118,119,
michael@0	141	120,121,122,123,124,125,126,127,
michael@0	142	128,129,130,131,132,133,134,135,
michael@0	143	136,137,138,139,140,141,142,143,
michael@0	144	144,145,146,147,148,149,150,151,
michael@0	145	152,153,154,155,156,157,158,159,
michael@0	146	160,161,162,163,164,165,166,167,
michael@0	147	168,169,170,170,171,171,172,172,
michael@0	148	173,173,173,174,174,174,175,175,
michael@0	149	175,176,176,176,177,177,177,177,
michael@0	150	178,178,179,179,180,180,181,181,
michael@0	151	182,182,183,183,184,184,185,185,
michael@0	152	186,186,187,187,188,188,189,189,
michael@0	153	190,190,191,191,192,192,193,193,
michael@0	154	};
michael@0	155	*/
michael@0	156
michael@0	157	static const int kf_gf_boost_qlimits[QINDEX_RANGE] =
michael@0	158	{
michael@0	159	150, 155, 160, 165, 170, 175, 180, 185,
michael@0	160	190, 195, 200, 205, 210, 215, 220, 225,
michael@0	161	230, 235, 240, 245, 250, 255, 260, 265,
michael@0	162	270, 275, 280, 285, 290, 295, 300, 305,
michael@0	163	310, 320, 330, 340, 350, 360, 370, 380,
michael@0	164	390, 400, 410, 420, 430, 440, 450, 460,
michael@0	165	470, 480, 490, 500, 510, 520, 530, 540,
michael@0	166	550, 560, 570, 580, 590, 600, 600, 600,
michael@0	167	600, 600, 600, 600, 600, 600, 600, 600,
michael@0	168	600, 600, 600, 600, 600, 600, 600, 600,
michael@0	169	600, 600, 600, 600, 600, 600, 600, 600,
michael@0	170	600, 600, 600, 600, 600, 600, 600, 600,
michael@0	171	600, 600, 600, 600, 600, 600, 600, 600,
michael@0	172	600, 600, 600, 600, 600, 600, 600, 600,
michael@0	173	600, 600, 600, 600, 600, 600, 600, 600,
michael@0	174	600, 600, 600, 600, 600, 600, 600, 600,
michael@0	175	};
michael@0	176
michael@0	177	/* % adjustment to target kf size based on seperation from previous frame */
michael@0	178	static const int kf_boost_seperation_adjustment[16] =
michael@0	179	{
michael@0	180	30, 40, 50, 55, 60, 65, 70, 75,
michael@0	181	80, 85, 90, 95, 100, 100, 100, 100,
michael@0	182	};
michael@0	183
michael@0	184
michael@0	185	static const int gf_adjust_table[101] =
michael@0	186	{
michael@0	187	100,
michael@0	188	115, 130, 145, 160, 175, 190, 200, 210, 220, 230,
michael@0	189	240, 260, 270, 280, 290, 300, 310, 320, 330, 340,
michael@0	190	350, 360, 370, 380, 390, 400, 400, 400, 400, 400,
michael@0	191	400, 400, 400, 400, 400, 400, 400, 400, 400, 400,
michael@0	192	400, 400, 400, 400, 400, 400, 400, 400, 400, 400,
michael@0	193	400, 400, 400, 400, 400, 400, 400, 400, 400, 400,
michael@0	194	400, 400, 400, 400, 400, 400, 400, 400, 400, 400,
michael@0	195	400, 400, 400, 400, 400, 400, 400, 400, 400, 400,
michael@0	196	400, 400, 400, 400, 400, 400, 400, 400, 400, 400,
michael@0	197	400, 400, 400, 400, 400, 400, 400, 400, 400, 400,
michael@0	198	};
michael@0	199
michael@0	200	static const int gf_intra_usage_adjustment[20] =
michael@0	201	{
michael@0	202	125, 120, 115, 110, 105, 100, 95, 85, 80, 75,
michael@0	203	70, 65, 60, 55, 50, 50, 50, 50, 50, 50,
michael@0	204	};
michael@0	205
michael@0	206	static const int gf_interval_table[101] =
michael@0	207	{
michael@0	208	7,
michael@0	209	7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
michael@0	210	7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
michael@0	211	7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
michael@0	212	8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
michael@0	213	8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
michael@0	214	9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
michael@0	215	9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
michael@0	216	10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
michael@0	217	10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
michael@0	218	11, 11, 11, 11, 11, 11, 11, 11, 11, 11,
michael@0	219	};
michael@0	220
michael@0	221	static const unsigned int prior_key_frame_weight[KEY_FRAME_CONTEXT] = { 1, 2, 3, 4, 5 };
michael@0	222
michael@0	223
michael@0	224	void vp8_save_coding_context(VP8_COMP *cpi)
michael@0	225	{
michael@0	226	CODING_CONTEXT *const cc = & cpi->coding_context;
michael@0	227
michael@0	228	/* Stores a snapshot of key state variables which can subsequently be
michael@0	229	* restored with a call to vp8_restore_coding_context. These functions are
michael@0	230	* intended for use in a re-code loop in vp8_compress_frame where the
michael@0	231	* quantizer value is adjusted between loop iterations.
michael@0	232	*/
michael@0	233
michael@0	234	cc->frames_since_key = cpi->frames_since_key;
michael@0	235	cc->filter_level = cpi->common.filter_level;
michael@0	236	cc->frames_till_gf_update_due = cpi->frames_till_gf_update_due;
michael@0	237	cc->frames_since_golden = cpi->frames_since_golden;
michael@0	238
michael@0	239	vp8_copy(cc->mvc, cpi->common.fc.mvc);
michael@0	240	vp8_copy(cc->mvcosts, cpi->rd_costs.mvcosts);
michael@0	241
michael@0	242	vp8_copy(cc->ymode_prob, cpi->common.fc.ymode_prob);
michael@0	243	vp8_copy(cc->uv_mode_prob, cpi->common.fc.uv_mode_prob);
michael@0	244
michael@0	245	vp8_copy(cc->ymode_count, cpi->mb.ymode_count);
michael@0	246	vp8_copy(cc->uv_mode_count, cpi->mb.uv_mode_count);
michael@0	247
michael@0	248
michael@0	249	/* Stats */
michael@0	250	#ifdef MODE_STATS
michael@0	251	vp8_copy(cc->y_modes, y_modes);
michael@0	252	vp8_copy(cc->uv_modes, uv_modes);
michael@0	253	vp8_copy(cc->b_modes, b_modes);
michael@0	254	vp8_copy(cc->inter_y_modes, inter_y_modes);
michael@0	255	vp8_copy(cc->inter_uv_modes, inter_uv_modes);
michael@0	256	vp8_copy(cc->inter_b_modes, inter_b_modes);
michael@0	257	#endif
michael@0	258
michael@0	259	cc->this_frame_percent_intra = cpi->this_frame_percent_intra;
michael@0	260	}
michael@0	261
michael@0	262
michael@0	263	void vp8_restore_coding_context(VP8_COMP *cpi)
michael@0	264	{
michael@0	265	CODING_CONTEXT *const cc = & cpi->coding_context;
michael@0	266
michael@0	267	/* Restore key state variables to the snapshot state stored in the
michael@0	268	* previous call to vp8_save_coding_context.
michael@0	269	*/
michael@0	270
michael@0	271	cpi->frames_since_key = cc->frames_since_key;
michael@0	272	cpi->common.filter_level = cc->filter_level;
michael@0	273	cpi->frames_till_gf_update_due = cc->frames_till_gf_update_due;
michael@0	274	cpi->frames_since_golden = cc->frames_since_golden;
michael@0	275
michael@0	276	vp8_copy(cpi->common.fc.mvc, cc->mvc);
michael@0	277
michael@0	278	vp8_copy(cpi->rd_costs.mvcosts, cc->mvcosts);
michael@0	279
michael@0	280	vp8_copy(cpi->common.fc.ymode_prob, cc->ymode_prob);
michael@0	281	vp8_copy(cpi->common.fc.uv_mode_prob, cc->uv_mode_prob);
michael@0	282
michael@0	283	vp8_copy(cpi->mb.ymode_count, cc->ymode_count);
michael@0	284	vp8_copy(cpi->mb.uv_mode_count, cc->uv_mode_count);
michael@0	285
michael@0	286	/* Stats */
michael@0	287	#ifdef MODE_STATS
michael@0	288	vp8_copy(y_modes, cc->y_modes);
michael@0	289	vp8_copy(uv_modes, cc->uv_modes);
michael@0	290	vp8_copy(b_modes, cc->b_modes);
michael@0	291	vp8_copy(inter_y_modes, cc->inter_y_modes);
michael@0	292	vp8_copy(inter_uv_modes, cc->inter_uv_modes);
michael@0	293	vp8_copy(inter_b_modes, cc->inter_b_modes);
michael@0	294	#endif
michael@0	295
michael@0	296
michael@0	297	cpi->this_frame_percent_intra = cc->this_frame_percent_intra;
michael@0	298	}
michael@0	299
michael@0	300
michael@0	301	void vp8_setup_key_frame(VP8_COMP *cpi)
michael@0	302	{
michael@0	303	/* Setup for Key frame: */
michael@0	304
michael@0	305	vp8_default_coef_probs(& cpi->common);
michael@0	306
michael@0	307	vpx_memcpy(cpi->common.fc.mvc, vp8_default_mv_context, sizeof(vp8_default_mv_context));
michael@0	308	{
michael@0	309	int flag[2] = {1, 1};
michael@0	310	vp8_build_component_cost_table(cpi->mb.mvcost, (const MV_CONTEXT *) cpi->common.fc.mvc, flag);
michael@0	311	}
michael@0	312
michael@0	313	/* Make sure we initialize separate contexts for altref,gold, and normal.
michael@0	314	* TODO shouldn't need 3 different copies of structure to do this!
michael@0	315	*/
michael@0	316	vpx_memcpy(&cpi->lfc_a, &cpi->common.fc, sizeof(cpi->common.fc));
michael@0	317	vpx_memcpy(&cpi->lfc_g, &cpi->common.fc, sizeof(cpi->common.fc));
michael@0	318	vpx_memcpy(&cpi->lfc_n, &cpi->common.fc, sizeof(cpi->common.fc));
michael@0	319
michael@0	320	cpi->common.filter_level = cpi->common.base_qindex * 3 / 8 ;
michael@0	321
michael@0	322	/* Provisional interval before next GF */
michael@0	323	if (cpi->auto_gold)
michael@0	324	cpi->frames_till_gf_update_due = cpi->baseline_gf_interval;
michael@0	325	else
michael@0	326	cpi->frames_till_gf_update_due = DEFAULT_GF_INTERVAL;
michael@0	327
michael@0	328	cpi->common.refresh_golden_frame = 1;
michael@0	329	cpi->common.refresh_alt_ref_frame = 1;
michael@0	330	}
michael@0	331
michael@0	332
michael@0	333	static int estimate_bits_at_q(int frame_kind, int Q, int MBs,
michael@0	334	double correction_factor)
michael@0	335	{
michael@0	336	int Bpm = (int)(.5 + correction_factor * vp8_bits_per_mb[frame_kind][Q]);
michael@0	337
michael@0	338	/* Attempt to retain reasonable accuracy without overflow. The cutoff is
michael@0	339	* chosen such that the maximum product of Bpm and MBs fits 31 bits. The
michael@0	340	* largest Bpm takes 20 bits.
michael@0	341	*/
michael@0	342	if (MBs > (1 << 11))
michael@0	343	return (Bpm >> BPER_MB_NORMBITS) * MBs;
michael@0	344	else
michael@0	345	return (Bpm * MBs) >> BPER_MB_NORMBITS;
michael@0	346	}
michael@0	347
michael@0	348
michael@0	349	static void calc_iframe_target_size(VP8_COMP *cpi)
michael@0	350	{
michael@0	351	/* boost defaults to half second */
michael@0	352	int kf_boost;
michael@0	353	uint64_t target;
michael@0	354
michael@0	355	/* Clear down mmx registers to allow floating point in what follows */
michael@0	356	vp8_clear_system_state();
michael@0	357
michael@0	358	if (cpi->oxcf.fixed_q >= 0)
michael@0	359	{
michael@0	360	int Q = cpi->oxcf.key_q;
michael@0	361
michael@0	362	target = estimate_bits_at_q(INTRA_FRAME, Q, cpi->common.MBs,
michael@0	363	cpi->key_frame_rate_correction_factor);
michael@0	364	}
michael@0	365	else if (cpi->pass == 2)
michael@0	366	{
michael@0	367	/* New Two pass RC */
michael@0	368	target = cpi->per_frame_bandwidth;
michael@0	369	}
michael@0	370	/* First Frame is a special case */
michael@0	371	else if (cpi->common.current_video_frame == 0)
michael@0	372	{
michael@0	373	/* 1 Pass there is no information on which to base size so use
michael@0	374	* bandwidth per second * fraction of the initial buffer
michael@0	375	* level
michael@0	376	*/
michael@0	377	target = cpi->oxcf.starting_buffer_level / 2;
michael@0	378
michael@0	379	if(target > cpi->oxcf.target_bandwidth * 3 / 2)
michael@0	380	target = cpi->oxcf.target_bandwidth * 3 / 2;
michael@0	381	}
michael@0	382	else
michael@0	383	{
michael@0	384	/* if this keyframe was forced, use a more recent Q estimate */
michael@0	385	int Q = (cpi->common.frame_flags & FRAMEFLAGS_KEY)
michael@0	386	? cpi->avg_frame_qindex : cpi->ni_av_qi;
michael@0	387
michael@0	388	int initial_boost = 32; /* |3.0 * per_frame_bandwidth| */
michael@0	389	/* Boost depends somewhat on frame rate: only used for 1 layer case. */
michael@0	390	if (cpi->oxcf.number_of_layers == 1) {
michael@0	391	kf_boost = MAX(initial_boost, (int)(2 * cpi->output_framerate - 16));
michael@0	392	}
michael@0	393	else {
michael@0	394	/* Initial factor: set target size to: |3.0 * per_frame_bandwidth|. */
michael@0	395	kf_boost = initial_boost;
michael@0	396	}
michael@0	397
michael@0	398	/* adjustment up based on q: this factor ranges from ~1.2 to 2.2. */
michael@0	399	kf_boost = kf_boost * kf_boost_qadjustment[Q] / 100;
michael@0	400
michael@0	401	/* frame separation adjustment ( down) */
michael@0	402	if (cpi->frames_since_key < cpi->output_framerate / 2)
michael@0	403	kf_boost = (int)(kf_boost
michael@0	404	* cpi->frames_since_key / (cpi->output_framerate / 2));
michael@0	405
michael@0	406	/* Minimal target size is |2* per_frame_bandwidth|. */
michael@0	407	if (kf_boost < 16)
michael@0	408	kf_boost = 16;
michael@0	409
michael@0	410	target = ((16 + kf_boost) * cpi->per_frame_bandwidth) >> 4;
michael@0	411	}
michael@0	412
michael@0	413
michael@0	414	if (cpi->oxcf.rc_max_intra_bitrate_pct)
michael@0	415	{
michael@0	416	unsigned int max_rate = cpi->per_frame_bandwidth
michael@0	417	* cpi->oxcf.rc_max_intra_bitrate_pct / 100;
michael@0	418
michael@0	419	if (target > max_rate)
michael@0	420	target = max_rate;
michael@0	421	}
michael@0	422
michael@0	423	cpi->this_frame_target = (int)target;
michael@0	424
michael@0	425	/* TODO: if we separate rate targeting from Q targetting, move this.
michael@0	426	* Reset the active worst quality to the baseline value for key frames.
michael@0	427	*/
michael@0	428	if (cpi->pass != 2)
michael@0	429	cpi->active_worst_quality = cpi->worst_quality;
michael@0	430
michael@0	431	#if 0
michael@0	432	{
michael@0	433	FILE *f;
michael@0	434
michael@0	435	f = fopen("kf_boost.stt", "a");
michael@0	436	fprintf(f, " %8u %10d %10d %10d\n",
michael@0	437	cpi->common.current_video_frame, cpi->gfu_boost, cpi->baseline_gf_interval, cpi->source_alt_ref_pending);
michael@0	438
michael@0	439	fclose(f);
michael@0	440	}
michael@0	441	#endif
michael@0	442	}
michael@0	443
michael@0	444
michael@0	445	/* Do the best we can to define the parameters for the next GF based on what
michael@0	446	* information we have available.
michael@0	447	*/
michael@0	448	static void calc_gf_params(VP8_COMP *cpi)
michael@0	449	{
michael@0	450	int Q = (cpi->oxcf.fixed_q < 0) ? cpi->last_q[INTER_FRAME] : cpi->oxcf.fixed_q;
michael@0	451	int Boost = 0;
michael@0	452
michael@0	453	int gf_frame_useage = 0; /* Golden frame useage since last GF */
michael@0	454	int tot_mbs = cpi->recent_ref_frame_usage[INTRA_FRAME] +
michael@0	455	cpi->recent_ref_frame_usage[LAST_FRAME] +
michael@0	456	cpi->recent_ref_frame_usage[GOLDEN_FRAME] +
michael@0	457	cpi->recent_ref_frame_usage[ALTREF_FRAME];
michael@0	458
michael@0	459	int pct_gf_active = (100 * cpi->gf_active_count) / (cpi->common.mb_rows * cpi->common.mb_cols);
michael@0	460
michael@0	461	if (tot_mbs)
michael@0	462	gf_frame_useage = (cpi->recent_ref_frame_usage[GOLDEN_FRAME] + cpi->recent_ref_frame_usage[ALTREF_FRAME]) * 100 / tot_mbs;
michael@0	463
michael@0	464	if (pct_gf_active > gf_frame_useage)
michael@0	465	gf_frame_useage = pct_gf_active;
michael@0	466
michael@0	467	/* Not two pass */
michael@0	468	if (cpi->pass != 2)
michael@0	469	{
michael@0	470	/* Single Pass lagged mode: TBD */
michael@0	471	if (0)
michael@0	472	{
michael@0	473	}
michael@0	474
michael@0	475	/* Single Pass compression: Has to use current and historical data */
michael@0	476	else
michael@0	477	{
michael@0	478	#if 0
michael@0	479	/* Experimental code */
michael@0	480	int index = cpi->one_pass_frame_index;
michael@0	481	int frames_to_scan = (cpi->max_gf_interval <= MAX_LAG_BUFFERS) ? cpi->max_gf_interval : MAX_LAG_BUFFERS;
michael@0	482
michael@0	483	/* ************** Experimental code - incomplete */
michael@0	484	/*
michael@0	485	double decay_val = 1.0;
michael@0	486	double IIAccumulator = 0.0;
michael@0	487	double last_iiaccumulator = 0.0;
michael@0	488	double IIRatio;
michael@0	489
michael@0	490	cpi->one_pass_frame_index = cpi->common.current_video_frame%MAX_LAG_BUFFERS;
michael@0	491
michael@0	492	for ( i = 0; i < (frames_to_scan - 1); i++ )
michael@0	493	{
michael@0	494	if ( index < 0 )
michael@0	495	index = MAX_LAG_BUFFERS;
michael@0	496	index --;
michael@0	497
michael@0	498	if ( cpi->one_pass_frame_stats[index].frame_coded_error > 0.0 )
michael@0	499	{
michael@0	500	IIRatio = cpi->one_pass_frame_stats[index].frame_intra_error / cpi->one_pass_frame_stats[index].frame_coded_error;
michael@0	501
michael@0	502	if ( IIRatio > 30.0 )
michael@0	503	IIRatio = 30.0;
michael@0	504	}
michael@0	505	else
michael@0	506	IIRatio = 30.0;
michael@0	507
michael@0	508	IIAccumulator += IIRatio * decay_val;
michael@0	509
michael@0	510	decay_val = decay_val * cpi->one_pass_frame_stats[index].frame_pcnt_inter;
michael@0	511
michael@0	512	if ( (i > MIN_GF_INTERVAL) &&
michael@0	513	((IIAccumulator - last_iiaccumulator) < 2.0) )
michael@0	514	{
michael@0	515	break;
michael@0	516	}
michael@0	517	last_iiaccumulator = IIAccumulator;
michael@0	518	}
michael@0	519
michael@0	520	Boost = IIAccumulator*100.0/16.0;
michael@0	521	cpi->baseline_gf_interval = i;
michael@0	522
michael@0	523	*/
michael@0	524	#else
michael@0	525
michael@0	526	/*************************************************************/
michael@0	527	/* OLD code */
michael@0	528
michael@0	529	/* Adjust boost based upon ambient Q */
michael@0	530	Boost = GFQ_ADJUSTMENT;
michael@0	531
michael@0	532	/* Adjust based upon most recently measure intra useage */
michael@0	533	Boost = Boost * gf_intra_usage_adjustment[(cpi->this_frame_percent_intra < 15) ? cpi->this_frame_percent_intra : 14] / 100;
michael@0	534
michael@0	535	/* Adjust gf boost based upon GF usage since last GF */
michael@0	536	Boost = Boost * gf_adjust_table[gf_frame_useage] / 100;
michael@0	537	#endif
michael@0	538	}
michael@0	539
michael@0	540	/* golden frame boost without recode loop often goes awry. be
michael@0	541	* safe by keeping numbers down.
michael@0	542	*/
michael@0	543	if (!cpi->sf.recode_loop)
michael@0	544	{
michael@0	545	if (cpi->compressor_speed == 2)
michael@0	546	Boost = Boost / 2;
michael@0	547	}
michael@0	548
michael@0	549	/* Apply an upper limit based on Q for 1 pass encodes */
michael@0	550	if (Boost > kf_gf_boost_qlimits[Q] && (cpi->pass == 0))
michael@0	551	Boost = kf_gf_boost_qlimits[Q];
michael@0	552
michael@0	553	/* Apply lower limits to boost. */
michael@0	554	else if (Boost < 110)
michael@0	555	Boost = 110;
michael@0	556
michael@0	557	/* Note the boost used */
michael@0	558	cpi->last_boost = Boost;
michael@0	559
michael@0	560	}
michael@0	561
michael@0	562	/* Estimate next interval
michael@0	563	* This is updated once the real frame size/boost is known.
michael@0	564	*/
michael@0	565	if (cpi->oxcf.fixed_q == -1)
michael@0	566	{
michael@0	567	if (cpi->pass == 2) /* 2 Pass */
michael@0	568	{
michael@0	569	cpi->frames_till_gf_update_due = cpi->baseline_gf_interval;
michael@0	570	}
michael@0	571	else /* 1 Pass */
michael@0	572	{
michael@0	573	cpi->frames_till_gf_update_due = cpi->baseline_gf_interval;
michael@0	574
michael@0	575	if (cpi->last_boost > 750)
michael@0	576	cpi->frames_till_gf_update_due++;
michael@0	577
michael@0	578	if (cpi->last_boost > 1000)
michael@0	579	cpi->frames_till_gf_update_due++;
michael@0	580
michael@0	581	if (cpi->last_boost > 1250)
michael@0	582	cpi->frames_till_gf_update_due++;
michael@0	583
michael@0	584	if (cpi->last_boost >= 1500)
michael@0	585	cpi->frames_till_gf_update_due ++;
michael@0	586
michael@0	587	if (gf_interval_table[gf_frame_useage] > cpi->frames_till_gf_update_due)
michael@0	588	cpi->frames_till_gf_update_due = gf_interval_table[gf_frame_useage];
michael@0	589
michael@0	590	if (cpi->frames_till_gf_update_due > cpi->max_gf_interval)
michael@0	591	cpi->frames_till_gf_update_due = cpi->max_gf_interval;
michael@0	592	}
michael@0	593	}
michael@0	594	else
michael@0	595	cpi->frames_till_gf_update_due = cpi->baseline_gf_interval;
michael@0	596
michael@0	597	/* ARF on or off */
michael@0	598	if (cpi->pass != 2)
michael@0	599	{
michael@0	600	/* For now Alt ref is not allowed except in 2 pass modes. */
michael@0	601	cpi->source_alt_ref_pending = 0;
michael@0	602
michael@0	603	/*if ( cpi->oxcf.fixed_q == -1)
michael@0	604	{
michael@0	605	if ( cpi->oxcf.play_alternate && (cpi->last_boost > (100 + (AF_THRESH*cpi->frames_till_gf_update_due)) ) )
michael@0	606	cpi->source_alt_ref_pending = 1;
michael@0	607	else
michael@0	608	cpi->source_alt_ref_pending = 0;
michael@0	609	}*/
michael@0	610	}
michael@0	611	}
michael@0	612
michael@0	613
michael@0	614	static void calc_pframe_target_size(VP8_COMP *cpi)
michael@0	615	{
michael@0	616	int min_frame_target;
michael@0	617	int old_per_frame_bandwidth = cpi->per_frame_bandwidth;
michael@0	618
michael@0	619	if ( cpi->current_layer > 0)
michael@0	620	cpi->per_frame_bandwidth =
michael@0	621	cpi->layer_context[cpi->current_layer].avg_frame_size_for_layer;
michael@0	622
michael@0	623	min_frame_target = 0;
michael@0	624
michael@0	625	if (cpi->pass == 2)
michael@0	626	{
michael@0	627	min_frame_target = cpi->min_frame_bandwidth;
michael@0	628
michael@0	629	if (min_frame_target < (cpi->av_per_frame_bandwidth >> 5))
michael@0	630	min_frame_target = cpi->av_per_frame_bandwidth >> 5;
michael@0	631	}
michael@0	632	else if (min_frame_target < cpi->per_frame_bandwidth / 4)
michael@0	633	min_frame_target = cpi->per_frame_bandwidth / 4;
michael@0	634
michael@0	635
michael@0	636	/* Special alt reference frame case */
michael@0	637	if((cpi->common.refresh_alt_ref_frame) && (cpi->oxcf.number_of_layers == 1))
michael@0	638	{
michael@0	639	if (cpi->pass == 2)
michael@0	640	{
michael@0	641	/* Per frame bit target for the alt ref frame */
michael@0	642	cpi->per_frame_bandwidth = cpi->twopass.gf_bits;
michael@0	643	cpi->this_frame_target = cpi->per_frame_bandwidth;
michael@0	644	}
michael@0	645
michael@0	646	/* One Pass ??? TBD */
michael@0	647	}
michael@0	648
michael@0	649	/* Normal frames (gf,and inter) */
michael@0	650	else
michael@0	651	{
michael@0	652	/* 2 pass */
michael@0	653	if (cpi->pass == 2)
michael@0	654	{
michael@0	655	cpi->this_frame_target = cpi->per_frame_bandwidth;
michael@0	656	}
michael@0	657	/* 1 pass */
michael@0	658	else
michael@0	659	{
michael@0	660	int Adjustment;
michael@0	661	/* Make rate adjustment to recover bits spent in key frame
michael@0	662	* Test to see if the key frame inter data rate correction
michael@0	663	* should still be in force
michael@0	664	*/
michael@0	665	if (cpi->kf_overspend_bits > 0)
michael@0	666	{
michael@0	667	Adjustment = (cpi->kf_bitrate_adjustment <= cpi->kf_overspend_bits) ? cpi->kf_bitrate_adjustment : cpi->kf_overspend_bits;
michael@0	668
michael@0	669	if (Adjustment > (cpi->per_frame_bandwidth - min_frame_target))
michael@0	670	Adjustment = (cpi->per_frame_bandwidth - min_frame_target);
michael@0	671
michael@0	672	cpi->kf_overspend_bits -= Adjustment;
michael@0	673
michael@0	674	/* Calculate an inter frame bandwidth target for the next
michael@0	675	* few frames designed to recover any extra bits spent on
michael@0	676	* the key frame.
michael@0	677	*/
michael@0	678	cpi->this_frame_target = cpi->per_frame_bandwidth - Adjustment;
michael@0	679
michael@0	680	if (cpi->this_frame_target < min_frame_target)
michael@0	681	cpi->this_frame_target = min_frame_target;
michael@0	682	}
michael@0	683	else
michael@0	684	cpi->this_frame_target = cpi->per_frame_bandwidth;
michael@0	685
michael@0	686	/* If appropriate make an adjustment to recover bits spent on a
michael@0	687	* recent GF
michael@0	688	*/
michael@0	689	if ((cpi->gf_overspend_bits > 0) && (cpi->this_frame_target > min_frame_target))
michael@0	690	{
michael@0	691	Adjustment = (cpi->non_gf_bitrate_adjustment <= cpi->gf_overspend_bits) ? cpi->non_gf_bitrate_adjustment : cpi->gf_overspend_bits;
michael@0	692
michael@0	693	if (Adjustment > (cpi->this_frame_target - min_frame_target))
michael@0	694	Adjustment = (cpi->this_frame_target - min_frame_target);
michael@0	695
michael@0	696	cpi->gf_overspend_bits -= Adjustment;
michael@0	697	cpi->this_frame_target -= Adjustment;
michael@0	698	}
michael@0	699
michael@0	700	/* Apply small + and - boosts for non gf frames */
michael@0	701	if ((cpi->last_boost > 150) && (cpi->frames_till_gf_update_due > 0) &&
michael@0	702	(cpi->current_gf_interval >= (MIN_GF_INTERVAL << 1)))
michael@0	703	{
michael@0	704	/* % Adjustment limited to the range 1% to 10% */
michael@0	705	Adjustment = (cpi->last_boost - 100) >> 5;
michael@0	706
michael@0	707	if (Adjustment < 1)
michael@0	708	Adjustment = 1;
michael@0	709	else if (Adjustment > 10)
michael@0	710	Adjustment = 10;
michael@0	711
michael@0	712	/* Convert to bits */
michael@0	713	Adjustment = (cpi->this_frame_target * Adjustment) / 100;
michael@0	714
michael@0	715	if (Adjustment > (cpi->this_frame_target - min_frame_target))
michael@0	716	Adjustment = (cpi->this_frame_target - min_frame_target);
michael@0	717
michael@0	718	if (cpi->frames_since_golden == (cpi->current_gf_interval >> 1))
michael@0	719	cpi->this_frame_target += ((cpi->current_gf_interval - 1) * Adjustment);
michael@0	720	else
michael@0	721	cpi->this_frame_target -= Adjustment;
michael@0	722	}
michael@0	723	}
michael@0	724	}
michael@0	725
michael@0	726	/* Sanity check that the total sum of adjustments is not above the
michael@0	727	* maximum allowed That is that having allowed for KF and GF penalties
michael@0	728	* we have not pushed the current interframe target to low. If the
michael@0	729	* adjustment we apply here is not capable of recovering all the extra
michael@0	730	* bits we have spent in the KF or GF then the remainder will have to
michael@0	731	* be recovered over a longer time span via other buffer / rate control
michael@0	732	* mechanisms.
michael@0	733	*/
michael@0	734	if (cpi->this_frame_target < min_frame_target)
michael@0	735	cpi->this_frame_target = min_frame_target;
michael@0	736
michael@0	737	if (!cpi->common.refresh_alt_ref_frame)
michael@0	738	/* Note the baseline target data rate for this inter frame. */
michael@0	739	cpi->inter_frame_target = cpi->this_frame_target;
michael@0	740
michael@0	741	/* One Pass specific code */
michael@0	742	if (cpi->pass == 0)
michael@0	743	{
michael@0	744	/* Adapt target frame size with respect to any buffering constraints: */
michael@0	745	if (cpi->buffered_mode)
michael@0	746	{
michael@0	747	int one_percent_bits = (int)
michael@0	748	(1 + cpi->oxcf.optimal_buffer_level / 100);
michael@0	749
michael@0	750	if ((cpi->buffer_level < cpi->oxcf.optimal_buffer_level) ||
michael@0	751	(cpi->bits_off_target < cpi->oxcf.optimal_buffer_level))
michael@0	752	{
michael@0	753	int percent_low = 0;
michael@0	754
michael@0	755	/* Decide whether or not we need to adjust the frame data
michael@0	756	* rate target.
michael@0	757	*
michael@0	758	* If we are are below the optimal buffer fullness level
michael@0	759	* and adherence to buffering constraints is important to
michael@0	760	* the end usage then adjust the per frame target.
michael@0	761	*/
michael@0	762	if ((cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER) &&
michael@0	763	(cpi->buffer_level < cpi->oxcf.optimal_buffer_level))
michael@0	764	{
michael@0	765	percent_low = (int)
michael@0	766	((cpi->oxcf.optimal_buffer_level - cpi->buffer_level) /
michael@0	767	one_percent_bits);
michael@0	768	}
michael@0	769	/* Are we overshooting the long term clip data rate... */
michael@0	770	else if (cpi->bits_off_target < 0)
michael@0	771	{
michael@0	772	/* Adjust per frame data target downwards to compensate. */
michael@0	773	percent_low = (int)(100 * -cpi->bits_off_target /
michael@0	774	(cpi->total_byte_count * 8));
michael@0	775	}
michael@0	776
michael@0	777	if (percent_low > cpi->oxcf.under_shoot_pct)
michael@0	778	percent_low = cpi->oxcf.under_shoot_pct;
michael@0	779	else if (percent_low < 0)
michael@0	780	percent_low = 0;
michael@0	781
michael@0	782	/* lower the target bandwidth for this frame. */
michael@0	783	cpi->this_frame_target -=
michael@0	784	(cpi->this_frame_target * percent_low) / 200;
michael@0	785
michael@0	786	/* Are we using allowing control of active_worst_allowed_q
michael@0	787	* according to buffer level.
michael@0	788	*/
michael@0	789	if (cpi->auto_worst_q && cpi->ni_frames > 150)
michael@0	790	{
michael@0	791	int64_t critical_buffer_level;
michael@0	792
michael@0	793	/* For streaming applications the most important factor is
michael@0	794	* cpi->buffer_level as this takes into account the
michael@0	795	* specified short term buffering constraints. However,
michael@0	796	* hitting the long term clip data rate target is also
michael@0	797	* important.
michael@0	798	*/
michael@0	799	if (cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER)
michael@0	800	{
michael@0	801	/* Take the smaller of cpi->buffer_level and
michael@0	802	* cpi->bits_off_target
michael@0	803	*/
michael@0	804	critical_buffer_level =
michael@0	805	(cpi->buffer_level < cpi->bits_off_target)
michael@0	806	? cpi->buffer_level : cpi->bits_off_target;
michael@0	807	}
michael@0	808	/* For local file playback short term buffering constraints
michael@0	809	* are less of an issue
michael@0	810	*/
michael@0	811	else
michael@0	812	{
michael@0	813	/* Consider only how we are doing for the clip as a
michael@0	814	* whole
michael@0	815	*/
michael@0	816	critical_buffer_level = cpi->bits_off_target;
michael@0	817	}
michael@0	818
michael@0	819	/* Set the active worst quality based upon the selected
michael@0	820	* buffer fullness number.
michael@0	821	*/
michael@0	822	if (critical_buffer_level < cpi->oxcf.optimal_buffer_level)
michael@0	823	{
michael@0	824	if ( critical_buffer_level >
michael@0	825	(cpi->oxcf.optimal_buffer_level >> 2) )
michael@0	826	{
michael@0	827	int64_t qadjustment_range =
michael@0	828	cpi->worst_quality - cpi->ni_av_qi;
michael@0	829	int64_t above_base =
michael@0	830	(critical_buffer_level -
michael@0	831	(cpi->oxcf.optimal_buffer_level >> 2));
michael@0	832
michael@0	833	/* Step active worst quality down from
michael@0	834	* cpi->ni_av_qi when (critical_buffer_level ==
michael@0	835	* cpi->optimal_buffer_level) to
michael@0	836	* cpi->worst_quality when
michael@0	837	* (critical_buffer_level ==
michael@0	838	* cpi->optimal_buffer_level >> 2)
michael@0	839	*/
michael@0	840	cpi->active_worst_quality =
michael@0	841	cpi->worst_quality -
michael@0	842	(int)((qadjustment_range * above_base) /
michael@0	843	(cpi->oxcf.optimal_buffer_level*3>>2));
michael@0	844	}
michael@0	845	else
michael@0	846	{
michael@0	847	cpi->active_worst_quality = cpi->worst_quality;
michael@0	848	}
michael@0	849	}
michael@0	850	else
michael@0	851	{
michael@0	852	cpi->active_worst_quality = cpi->ni_av_qi;
michael@0	853	}
michael@0	854	}
michael@0	855	else
michael@0	856	{
michael@0	857	cpi->active_worst_quality = cpi->worst_quality;
michael@0	858	}
michael@0	859	}
michael@0	860	else
michael@0	861	{
michael@0	862	int percent_high = 0;
michael@0	863
michael@0	864	if ((cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER)
michael@0	865	&& (cpi->buffer_level > cpi->oxcf.optimal_buffer_level))
michael@0	866	{
michael@0	867	percent_high = (int)((cpi->buffer_level
michael@0	868	- cpi->oxcf.optimal_buffer_level)
michael@0	869	/ one_percent_bits);
michael@0	870	}
michael@0	871	else if (cpi->bits_off_target > cpi->oxcf.optimal_buffer_level)
michael@0	872	{
michael@0	873	percent_high = (int)((100 * cpi->bits_off_target)
michael@0	874	/ (cpi->total_byte_count * 8));
michael@0	875	}
michael@0	876
michael@0	877	if (percent_high > cpi->oxcf.over_shoot_pct)
michael@0	878	percent_high = cpi->oxcf.over_shoot_pct;
michael@0	879	else if (percent_high < 0)
michael@0	880	percent_high = 0;
michael@0	881
michael@0	882	cpi->this_frame_target += (cpi->this_frame_target *
michael@0	883	percent_high) / 200;
michael@0	884
michael@0	885	/* Are we allowing control of active_worst_allowed_q according
michael@0	886	* to buffer level.
michael@0	887	*/
michael@0	888	if (cpi->auto_worst_q && cpi->ni_frames > 150)
michael@0	889	{
michael@0	890	/* When using the relaxed buffer model stick to the
michael@0	891	* user specified value
michael@0	892	*/
michael@0	893	cpi->active_worst_quality = cpi->ni_av_qi;
michael@0	894	}
michael@0	895	else
michael@0	896	{
michael@0	897	cpi->active_worst_quality = cpi->worst_quality;
michael@0	898	}
michael@0	899	}
michael@0	900
michael@0	901	/* Set active_best_quality to prevent quality rising too high */
michael@0	902	cpi->active_best_quality = cpi->best_quality;
michael@0	903
michael@0	904	/* Worst quality obviously must not be better than best quality */
michael@0	905	if (cpi->active_worst_quality <= cpi->active_best_quality)
michael@0	906	cpi->active_worst_quality = cpi->active_best_quality + 1;
michael@0	907
michael@0	908	if(cpi->active_worst_quality > 127)
michael@0	909	cpi->active_worst_quality = 127;
michael@0	910	}
michael@0	911	/* Unbuffered mode (eg. video conferencing) */
michael@0	912	else
michael@0	913	{
michael@0	914	/* Set the active worst quality */
michael@0	915	cpi->active_worst_quality = cpi->worst_quality;
michael@0	916	}
michael@0	917
michael@0	918	/* Special trap for constrained quality mode
michael@0	919	* "active_worst_quality" may never drop below cq level
michael@0	920	* for any frame type.
michael@0	921	*/
michael@0	922	if ( cpi->oxcf.end_usage == USAGE_CONSTRAINED_QUALITY &&
michael@0	923	cpi->active_worst_quality < cpi->cq_target_quality)
michael@0	924	{
michael@0	925	cpi->active_worst_quality = cpi->cq_target_quality;
michael@0	926	}
michael@0	927	}
michael@0	928
michael@0	929	/* Test to see if we have to drop a frame
michael@0	930	* The auto-drop frame code is only used in buffered mode.
michael@0	931	* In unbufferd mode (eg vide conferencing) the descision to
michael@0	932	* code or drop a frame is made outside the codec in response to real
michael@0	933	* world comms or buffer considerations.
michael@0	934	*/
michael@0	935	if (cpi->drop_frames_allowed &&
michael@0	936	(cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER) &&
michael@0	937	((cpi->common.frame_type != KEY_FRAME)))
michael@0	938	{
michael@0	939	/* Check for a buffer underun-crisis in which case we have to drop
michael@0	940	* a frame
michael@0	941	*/
michael@0	942	if ((cpi->buffer_level < 0))
michael@0	943	{
michael@0	944	#if 0
michael@0	945	FILE *f = fopen("dec.stt", "a");
michael@0	946	fprintf(f, "%10d %10d %10d %10d ***** BUFFER EMPTY\n",
michael@0	947	(int) cpi->common.current_video_frame,
michael@0	948	cpi->decimation_factor, cpi->common.horiz_scale,
michael@0	949	(cpi->buffer_level * 100) / cpi->oxcf.optimal_buffer_level);
michael@0	950	fclose(f);
michael@0	951	#endif
michael@0	952	cpi->drop_frame = 1;
michael@0	953
michael@0	954	/* Update the buffer level variable. */
michael@0	955	cpi->bits_off_target += cpi->av_per_frame_bandwidth;
michael@0	956	if (cpi->bits_off_target > cpi->oxcf.maximum_buffer_size)
michael@0	957	cpi->bits_off_target = (int)cpi->oxcf.maximum_buffer_size;
michael@0	958	cpi->buffer_level = cpi->bits_off_target;
michael@0	959
michael@0	960	if (cpi->oxcf.number_of_layers > 1) {
michael@0	961	unsigned int i;
michael@0	962
michael@0	963	// Propagate bits saved by dropping the frame to higher layers.
michael@0	964	for (i = cpi->current_layer + 1; i < cpi->oxcf.number_of_layers;
michael@0	965	i++) {
michael@0	966	LAYER_CONTEXT *lc = &cpi->layer_context[i];
michael@0	967	lc->bits_off_target += (int)(lc->target_bandwidth /
michael@0	968	lc->framerate);
michael@0	969	if (lc->bits_off_target > lc->maximum_buffer_size)
michael@0	970	lc->bits_off_target = lc->maximum_buffer_size;
michael@0	971	lc->buffer_level = lc->bits_off_target;
michael@0	972	}
michael@0	973	}
michael@0	974	}
michael@0	975	}
michael@0	976
michael@0	977	/* Adjust target frame size for Golden Frames: */
michael@0	978	if (cpi->oxcf.error_resilient_mode == 0 &&
michael@0	979	(cpi->frames_till_gf_update_due == 0) && !cpi->drop_frame)
michael@0	980	{
michael@0	981	int Q = (cpi->oxcf.fixed_q < 0) ? cpi->last_q[INTER_FRAME] : cpi->oxcf.fixed_q;
michael@0	982
michael@0	983	int gf_frame_useage = 0; /* Golden frame useage since last GF */
michael@0	984	int tot_mbs = cpi->recent_ref_frame_usage[INTRA_FRAME] +
michael@0	985	cpi->recent_ref_frame_usage[LAST_FRAME] +
michael@0	986	cpi->recent_ref_frame_usage[GOLDEN_FRAME] +
michael@0	987	cpi->recent_ref_frame_usage[ALTREF_FRAME];
michael@0	988
michael@0	989	int pct_gf_active = (100 * cpi->gf_active_count) / (cpi->common.mb_rows * cpi->common.mb_cols);
michael@0	990
michael@0	991	if (tot_mbs)
michael@0	992	gf_frame_useage = (cpi->recent_ref_frame_usage[GOLDEN_FRAME] + cpi->recent_ref_frame_usage[ALTREF_FRAME]) * 100 / tot_mbs;
michael@0	993
michael@0	994	if (pct_gf_active > gf_frame_useage)
michael@0	995	gf_frame_useage = pct_gf_active;
michael@0	996
michael@0	997	/* Is a fixed manual GF frequency being used */
michael@0	998	if (cpi->auto_gold)
michael@0	999	{
michael@0	1000	/* For one pass throw a GF if recent frame intra useage is
michael@0	1001	* low or the GF useage is high
michael@0	1002	*/
michael@0	1003	if ((cpi->pass == 0) && (cpi->this_frame_percent_intra < 15 || gf_frame_useage >= 5))
michael@0	1004	cpi->common.refresh_golden_frame = 1;
michael@0	1005
michael@0	1006	/* Two pass GF descision */
michael@0	1007	else if (cpi->pass == 2)
michael@0	1008	cpi->common.refresh_golden_frame = 1;
michael@0	1009	}
michael@0	1010
michael@0	1011	#if 0
michael@0	1012
michael@0	1013	/* Debug stats */
michael@0	1014	if (0)
michael@0	1015	{
michael@0	1016	FILE *f;
michael@0	1017
michael@0	1018	f = fopen("gf_useaget.stt", "a");
michael@0	1019	fprintf(f, " %8ld %10ld %10ld %10ld %10ld\n",
michael@0	1020	cpi->common.current_video_frame, cpi->gfu_boost, GFQ_ADJUSTMENT, cpi->gfu_boost, gf_frame_useage);
michael@0	1021	fclose(f);
michael@0	1022	}
michael@0	1023
michael@0	1024	#endif
michael@0	1025
michael@0	1026	if (cpi->common.refresh_golden_frame == 1)
michael@0	1027	{
michael@0	1028	#if 0
michael@0	1029
michael@0	1030	if (0)
michael@0	1031	{
michael@0	1032	FILE *f;
michael@0	1033
michael@0	1034	f = fopen("GFexit.stt", "a");
michael@0	1035	fprintf(f, "%8ld GF coded\n", cpi->common.current_video_frame);
michael@0	1036	fclose(f);
michael@0	1037	}
michael@0	1038
michael@0	1039	#endif
michael@0	1040
michael@0	1041	if (cpi->auto_adjust_gold_quantizer)
michael@0	1042	{
michael@0	1043	calc_gf_params(cpi);
michael@0	1044	}
michael@0	1045
michael@0	1046	/* If we are using alternate ref instead of gf then do not apply the
michael@0	1047	* boost It will instead be applied to the altref update Jims
michael@0	1048	* modified boost
michael@0	1049	*/
michael@0	1050	if (!cpi->source_alt_ref_active)
michael@0	1051	{
michael@0	1052	if (cpi->oxcf.fixed_q < 0)
michael@0	1053	{
michael@0	1054	if (cpi->pass == 2)
michael@0	1055	{
michael@0	1056	/* The spend on the GF is defined in the two pass
michael@0	1057	* code for two pass encodes
michael@0	1058	*/
michael@0	1059	cpi->this_frame_target = cpi->per_frame_bandwidth;
michael@0	1060	}
michael@0	1061	else
michael@0	1062	{
michael@0	1063	int Boost = cpi->last_boost;
michael@0	1064	int frames_in_section = cpi->frames_till_gf_update_due + 1;
michael@0	1065	int allocation_chunks = (frames_in_section * 100) + (Boost - 100);
michael@0	1066	int bits_in_section = cpi->inter_frame_target * frames_in_section;
michael@0	1067
michael@0	1068	/* Normalize Altboost and allocations chunck down to
michael@0	1069	* prevent overflow
michael@0	1070	*/
michael@0	1071	while (Boost > 1000)
michael@0	1072	{
michael@0	1073	Boost /= 2;
michael@0	1074	allocation_chunks /= 2;
michael@0	1075	}
michael@0	1076
michael@0	1077	/* Avoid loss of precision but avoid overflow */
michael@0	1078	if ((bits_in_section >> 7) > allocation_chunks)
michael@0	1079	cpi->this_frame_target = Boost * (bits_in_section / allocation_chunks);
michael@0	1080	else
michael@0	1081	cpi->this_frame_target = (Boost * bits_in_section) / allocation_chunks;
michael@0	1082	}
michael@0	1083	}
michael@0	1084	else
michael@0	1085	cpi->this_frame_target =
michael@0	1086	(estimate_bits_at_q(1, Q, cpi->common.MBs, 1.0)
michael@0	1087	* cpi->last_boost) / 100;
michael@0	1088
michael@0	1089	}
michael@0	1090	/* If there is an active ARF at this location use the minimum
michael@0	1091	* bits on this frame even if it is a contructed arf.
michael@0	1092	* The active maximum quantizer insures that an appropriate
michael@0	1093	* number of bits will be spent if needed for contstructed ARFs.
michael@0	1094	*/
michael@0	1095	else
michael@0	1096	{
michael@0	1097	cpi->this_frame_target = 0;
michael@0	1098	}
michael@0	1099
michael@0	1100	cpi->current_gf_interval = cpi->frames_till_gf_update_due;
michael@0	1101
michael@0	1102	}
michael@0	1103	}
michael@0	1104
michael@0	1105	cpi->per_frame_bandwidth = old_per_frame_bandwidth;
michael@0	1106	}
michael@0	1107
michael@0	1108
michael@0	1109	void vp8_update_rate_correction_factors(VP8_COMP *cpi, int damp_var)
michael@0	1110	{
michael@0	1111	int Q = cpi->common.base_qindex;
michael@0	1112	int correction_factor = 100;
michael@0	1113	double rate_correction_factor;
michael@0	1114	double adjustment_limit;
michael@0	1115
michael@0	1116	int projected_size_based_on_q = 0;
michael@0	1117
michael@0	1118	/* Clear down mmx registers to allow floating point in what follows */
michael@0	1119	vp8_clear_system_state();
michael@0	1120
michael@0	1121	if (cpi->common.frame_type == KEY_FRAME)
michael@0	1122	{
michael@0	1123	rate_correction_factor = cpi->key_frame_rate_correction_factor;
michael@0	1124	}
michael@0	1125	else
michael@0	1126	{
michael@0	1127	if (cpi->oxcf.number_of_layers == 1 &&
michael@0	1128	(cpi->common.refresh_alt_ref_frame ||
michael@0	1129	cpi->common.refresh_golden_frame))
michael@0	1130	rate_correction_factor = cpi->gf_rate_correction_factor;
michael@0	1131	else
michael@0	1132	rate_correction_factor = cpi->rate_correction_factor;
michael@0	1133	}
michael@0	1134
michael@0	1135	/* Work out how big we would have expected the frame to be at this Q
michael@0	1136	* given the current correction factor. Stay in double to avoid int
michael@0	1137	* overflow when values are large
michael@0	1138	*/
michael@0	1139	projected_size_based_on_q = (int)(((.5 + rate_correction_factor * vp8_bits_per_mb[cpi->common.frame_type][Q]) * cpi->common.MBs) / (1 << BPER_MB_NORMBITS));
michael@0	1140
michael@0	1141	/* Make some allowance for cpi->zbin_over_quant */
michael@0	1142	if (cpi->mb.zbin_over_quant > 0)
michael@0	1143	{
michael@0	1144	int Z = cpi->mb.zbin_over_quant;
michael@0	1145	double Factor = 0.99;
michael@0	1146	double factor_adjustment = 0.01 / 256.0;
michael@0	1147
michael@0	1148	while (Z > 0)
michael@0	1149	{
michael@0	1150	Z --;
michael@0	1151	projected_size_based_on_q =
michael@0	1152	(int)(Factor * projected_size_based_on_q);
michael@0	1153	Factor += factor_adjustment;
michael@0	1154
michael@0	1155	if (Factor >= 0.999)
michael@0	1156	Factor = 0.999;
michael@0	1157	}
michael@0	1158	}
michael@0	1159
michael@0	1160	/* Work out a size correction factor. */
michael@0	1161	if (projected_size_based_on_q > 0)
michael@0	1162	correction_factor = (100 * cpi->projected_frame_size) / projected_size_based_on_q;
michael@0	1163
michael@0	1164	/* More heavily damped adjustment used if we have been oscillating
michael@0	1165	* either side of target
michael@0	1166	*/
michael@0	1167	switch (damp_var)
michael@0	1168	{
michael@0	1169	case 0:
michael@0	1170	adjustment_limit = 0.75;
michael@0	1171	break;
michael@0	1172	case 1:
michael@0	1173	adjustment_limit = 0.375;
michael@0	1174	break;
michael@0	1175	case 2:
michael@0	1176	default:
michael@0	1177	adjustment_limit = 0.25;
michael@0	1178	break;
michael@0	1179	}
michael@0	1180
michael@0	1181	if (correction_factor > 102)
michael@0	1182	{
michael@0	1183	/* We are not already at the worst allowable quality */
michael@0	1184	correction_factor = (int)(100.5 + ((correction_factor - 100) * adjustment_limit));
michael@0	1185	rate_correction_factor = ((rate_correction_factor * correction_factor) / 100);
michael@0	1186
michael@0	1187	/* Keep rate_correction_factor within limits */
michael@0	1188	if (rate_correction_factor > MAX_BPB_FACTOR)
michael@0	1189	rate_correction_factor = MAX_BPB_FACTOR;
michael@0	1190	}
michael@0	1191	else if (correction_factor < 99)
michael@0	1192	{
michael@0	1193	/* We are not already at the best allowable quality */
michael@0	1194	correction_factor = (int)(100.5 - ((100 - correction_factor) * adjustment_limit));
michael@0	1195	rate_correction_factor = ((rate_correction_factor * correction_factor) / 100);
michael@0	1196
michael@0	1197	/* Keep rate_correction_factor within limits */
michael@0	1198	if (rate_correction_factor < MIN_BPB_FACTOR)
michael@0	1199	rate_correction_factor = MIN_BPB_FACTOR;
michael@0	1200	}
michael@0	1201
michael@0	1202	if (cpi->common.frame_type == KEY_FRAME)
michael@0	1203	cpi->key_frame_rate_correction_factor = rate_correction_factor;
michael@0	1204	else
michael@0	1205	{
michael@0	1206	if (cpi->oxcf.number_of_layers == 1 &&
michael@0	1207	(cpi->common.refresh_alt_ref_frame ||
michael@0	1208	cpi->common.refresh_golden_frame))
michael@0	1209	cpi->gf_rate_correction_factor = rate_correction_factor;
michael@0	1210	else
michael@0	1211	cpi->rate_correction_factor = rate_correction_factor;
michael@0	1212	}
michael@0	1213	}
michael@0	1214
michael@0	1215
michael@0	1216	int vp8_regulate_q(VP8_COMP *cpi, int target_bits_per_frame)
michael@0	1217	{
michael@0	1218	int Q = cpi->active_worst_quality;
michael@0	1219
michael@0	1220	/* Reset Zbin OQ value */
michael@0	1221	cpi->mb.zbin_over_quant = 0;
michael@0	1222
michael@0	1223	if (cpi->oxcf.fixed_q >= 0)
michael@0	1224	{
michael@0	1225	Q = cpi->oxcf.fixed_q;
michael@0	1226
michael@0	1227	if (cpi->common.frame_type == KEY_FRAME)
michael@0	1228	{
michael@0	1229	Q = cpi->oxcf.key_q;
michael@0	1230	}
michael@0	1231	else if (cpi->oxcf.number_of_layers == 1 &&
michael@0	1232	cpi->common.refresh_alt_ref_frame)
michael@0	1233	{
michael@0	1234	Q = cpi->oxcf.alt_q;
michael@0	1235	}
michael@0	1236	else if (cpi->oxcf.number_of_layers == 1 &&
michael@0	1237	cpi->common.refresh_golden_frame)
michael@0	1238	{
michael@0	1239	Q = cpi->oxcf.gold_q;
michael@0	1240	}
michael@0	1241
michael@0	1242	}
michael@0	1243	else
michael@0	1244	{
michael@0	1245	int i;
michael@0	1246	int last_error = INT_MAX;
michael@0	1247	int target_bits_per_mb;
michael@0	1248	int bits_per_mb_at_this_q;
michael@0	1249	double correction_factor;
michael@0	1250
michael@0	1251	/* Select the appropriate correction factor based upon type of frame. */
michael@0	1252	if (cpi->common.frame_type == KEY_FRAME)
michael@0	1253	correction_factor = cpi->key_frame_rate_correction_factor;
michael@0	1254	else
michael@0	1255	{
michael@0	1256	if (cpi->oxcf.number_of_layers == 1 &&
michael@0	1257	(cpi->common.refresh_alt_ref_frame ||
michael@0	1258	cpi->common.refresh_golden_frame))
michael@0	1259	correction_factor = cpi->gf_rate_correction_factor;
michael@0	1260	else
michael@0	1261	correction_factor = cpi->rate_correction_factor;
michael@0	1262	}
michael@0	1263
michael@0	1264	/* Calculate required scaling factor based on target frame size and
michael@0	1265	* size of frame produced using previous Q
michael@0	1266	*/
michael@0	1267	if (target_bits_per_frame >= (INT_MAX >> BPER_MB_NORMBITS))
michael@0	1268	/* Case where we would overflow int */
michael@0	1269	target_bits_per_mb = (target_bits_per_frame / cpi->common.MBs) << BPER_MB_NORMBITS;
michael@0	1270	else
michael@0	1271	target_bits_per_mb = (target_bits_per_frame << BPER_MB_NORMBITS) / cpi->common.MBs;
michael@0	1272
michael@0	1273	i = cpi->active_best_quality;
michael@0	1274
michael@0	1275	do
michael@0	1276	{
michael@0	1277	bits_per_mb_at_this_q = (int)(.5 + correction_factor * vp8_bits_per_mb[cpi->common.frame_type][i]);
michael@0	1278
michael@0	1279	if (bits_per_mb_at_this_q <= target_bits_per_mb)
michael@0	1280	{
michael@0	1281	if ((target_bits_per_mb - bits_per_mb_at_this_q) <= last_error)
michael@0	1282	Q = i;
michael@0	1283	else
michael@0	1284	Q = i - 1;
michael@0	1285
michael@0	1286	break;
michael@0	1287	}
michael@0	1288	else
michael@0	1289	last_error = bits_per_mb_at_this_q - target_bits_per_mb;
michael@0	1290	}
michael@0	1291	while (++i <= cpi->active_worst_quality);
michael@0	1292
michael@0	1293
michael@0	1294	/* If we are at MAXQ then enable Q over-run which seeks to claw
michael@0	1295	* back additional bits through things like the RD multiplier
michael@0	1296	* and zero bin size.
michael@0	1297	*/
michael@0	1298	if (Q >= MAXQ)
michael@0	1299	{
michael@0	1300	int zbin_oqmax;
michael@0	1301
michael@0	1302	double Factor = 0.99;
michael@0	1303	double factor_adjustment = 0.01 / 256.0;
michael@0	1304
michael@0	1305	if (cpi->common.frame_type == KEY_FRAME)
michael@0	1306	zbin_oqmax = 0;
michael@0	1307	else if (cpi->oxcf.number_of_layers == 1 &&
michael@0	1308	(cpi->common.refresh_alt_ref_frame ||
michael@0	1309	(cpi->common.refresh_golden_frame &&
michael@0	1310	!cpi->source_alt_ref_active)))
michael@0	1311	zbin_oqmax = 16;
michael@0	1312	else
michael@0	1313	zbin_oqmax = ZBIN_OQ_MAX;
michael@0	1314
michael@0	1315	/*{
michael@0	1316	double Factor = (double)target_bits_per_mb/(double)bits_per_mb_at_this_q;
michael@0	1317	double Oq;
michael@0	1318
michael@0	1319	Factor = Factor/1.2683;
michael@0	1320
michael@0	1321	Oq = pow( Factor, (1.0/-0.165) );
michael@0	1322
michael@0	1323	if ( Oq > zbin_oqmax )
michael@0	1324	Oq = zbin_oqmax;
michael@0	1325
michael@0	1326	cpi->zbin_over_quant = (int)Oq;
michael@0	1327	}*/
michael@0	1328
michael@0	1329	/* Each incrment in the zbin is assumed to have a fixed effect
michael@0	1330	* on bitrate. This is not of course true. The effect will be
michael@0	1331	* highly clip dependent and may well have sudden steps. The
michael@0	1332	* idea here is to acheive higher effective quantizers than the
michael@0	1333	* normal maximum by expanding the zero bin and hence
michael@0	1334	* decreasing the number of low magnitude non zero coefficients.
michael@0	1335	*/
michael@0	1336	while (cpi->mb.zbin_over_quant < zbin_oqmax)
michael@0	1337	{
michael@0	1338	cpi->mb.zbin_over_quant ++;
michael@0	1339
michael@0	1340	if (cpi->mb.zbin_over_quant > zbin_oqmax)
michael@0	1341	cpi->mb.zbin_over_quant = zbin_oqmax;
michael@0	1342
michael@0	1343	/* Adjust bits_per_mb_at_this_q estimate */
michael@0	1344	bits_per_mb_at_this_q = (int)(Factor * bits_per_mb_at_this_q);
michael@0	1345	Factor += factor_adjustment;
michael@0	1346
michael@0	1347	if (Factor >= 0.999)
michael@0	1348	Factor = 0.999;
michael@0	1349
michael@0	1350	/* Break out if we get down to the target rate */
michael@0	1351	if (bits_per_mb_at_this_q <= target_bits_per_mb)
michael@0	1352	break;
michael@0	1353	}
michael@0	1354
michael@0	1355	}
michael@0	1356	}
michael@0	1357
michael@0	1358	return Q;
michael@0	1359	}
michael@0	1360
michael@0	1361
michael@0	1362	static int estimate_keyframe_frequency(VP8_COMP *cpi)
michael@0	1363	{
michael@0	1364	int i;
michael@0	1365
michael@0	1366	/* Average key frame frequency */
michael@0	1367	int av_key_frame_frequency = 0;
michael@0	1368
michael@0	1369	/* First key frame at start of sequence is a special case. We have no
michael@0	1370	* frequency data.
michael@0	1371	*/
michael@0	1372	if (cpi->key_frame_count == 1)
michael@0	1373	{
michael@0	1374	/* Assume a default of 1 kf every 2 seconds, or the max kf interval,
michael@0	1375	* whichever is smaller.
michael@0	1376	*/
michael@0	1377	int key_freq = cpi->oxcf.key_freq>0 ? cpi->oxcf.key_freq : 1;
michael@0	1378	av_key_frame_frequency = 1 + (int)cpi->output_framerate * 2;
michael@0	1379
michael@0	1380	if (cpi->oxcf.auto_key && av_key_frame_frequency > key_freq)
michael@0	1381	av_key_frame_frequency = key_freq;
michael@0	1382
michael@0	1383	cpi->prior_key_frame_distance[KEY_FRAME_CONTEXT - 1]
michael@0	1384	= av_key_frame_frequency;
michael@0	1385	}
michael@0	1386	else
michael@0	1387	{
michael@0	1388	unsigned int total_weight = 0;
michael@0	1389	int last_kf_interval =
michael@0	1390	(cpi->frames_since_key > 0) ? cpi->frames_since_key : 1;
michael@0	1391
michael@0	1392	/* reset keyframe context and calculate weighted average of last
michael@0	1393	* KEY_FRAME_CONTEXT keyframes
michael@0	1394	*/
michael@0	1395	for (i = 0; i < KEY_FRAME_CONTEXT; i++)
michael@0	1396	{
michael@0	1397	if (i < KEY_FRAME_CONTEXT - 1)
michael@0	1398	cpi->prior_key_frame_distance[i]
michael@0	1399	= cpi->prior_key_frame_distance[i+1];
michael@0	1400	else
michael@0	1401	cpi->prior_key_frame_distance[i] = last_kf_interval;
michael@0	1402
michael@0	1403	av_key_frame_frequency += prior_key_frame_weight[i]
michael@0	1404	* cpi->prior_key_frame_distance[i];
michael@0	1405	total_weight += prior_key_frame_weight[i];
michael@0	1406	}
michael@0	1407
michael@0	1408	av_key_frame_frequency /= total_weight;
michael@0	1409
michael@0	1410	}
michael@0	1411	// TODO (marpan): Given the checks above, |av_key_frame_frequency|
michael@0	1412	// should always be above 0. But for now we keep the sanity check in.
michael@0	1413	if (av_key_frame_frequency == 0)
michael@0	1414	av_key_frame_frequency = 1;
michael@0	1415	return av_key_frame_frequency;
michael@0	1416	}
michael@0	1417
michael@0	1418
michael@0	1419	void vp8_adjust_key_frame_context(VP8_COMP *cpi)
michael@0	1420	{
michael@0	1421	/* Clear down mmx registers to allow floating point in what follows */
michael@0	1422	vp8_clear_system_state();
michael@0	1423
michael@0	1424	/* Do we have any key frame overspend to recover? */
michael@0	1425	/* Two-pass overspend handled elsewhere. */
michael@0	1426	if ((cpi->pass != 2)
michael@0	1427	&& (cpi->projected_frame_size > cpi->per_frame_bandwidth))
michael@0	1428	{
michael@0	1429	int overspend;
michael@0	1430
michael@0	1431	/* Update the count of key frame overspend to be recovered in
michael@0	1432	* subsequent frames. A portion of the KF overspend is treated as gf
michael@0	1433	* overspend (and hence recovered more quickly) as the kf is also a
michael@0	1434	* gf. Otherwise the few frames following each kf tend to get more
michael@0	1435	* bits allocated than those following other gfs.
michael@0	1436	*/
michael@0	1437	overspend = (cpi->projected_frame_size - cpi->per_frame_bandwidth);
michael@0	1438
michael@0	1439	if (cpi->oxcf.number_of_layers > 1)
michael@0	1440	cpi->kf_overspend_bits += overspend;
michael@0	1441	else
michael@0	1442	{
michael@0	1443	cpi->kf_overspend_bits += overspend * 7 / 8;
michael@0	1444	cpi->gf_overspend_bits += overspend * 1 / 8;
michael@0	1445	}
michael@0	1446
michael@0	1447	/* Work out how much to try and recover per frame. */
michael@0	1448	cpi->kf_bitrate_adjustment = cpi->kf_overspend_bits
michael@0	1449	/ estimate_keyframe_frequency(cpi);
michael@0	1450	}
michael@0	1451
michael@0	1452	cpi->frames_since_key = 0;
michael@0	1453	cpi->key_frame_count++;
michael@0	1454	}
michael@0	1455
michael@0	1456
michael@0	1457	void vp8_compute_frame_size_bounds(VP8_COMP *cpi, int *frame_under_shoot_limit, int *frame_over_shoot_limit)
michael@0	1458	{
michael@0	1459	/* Set-up bounds on acceptable frame size: */
michael@0	1460	if (cpi->oxcf.fixed_q >= 0)
michael@0	1461	{
michael@0	1462	/* Fixed Q scenario: frame size never outranges target
michael@0	1463	* (there is no target!)
michael@0	1464	*/
michael@0	1465	*frame_under_shoot_limit = 0;
michael@0	1466	*frame_over_shoot_limit = INT_MAX;
michael@0	1467	}
michael@0	1468	else
michael@0	1469	{
michael@0	1470	if (cpi->common.frame_type == KEY_FRAME)
michael@0	1471	{
michael@0	1472	*frame_over_shoot_limit = cpi->this_frame_target * 9 / 8;
michael@0	1473	*frame_under_shoot_limit = cpi->this_frame_target * 7 / 8;
michael@0	1474	}
michael@0	1475	else
michael@0	1476	{
michael@0	1477	if (cpi->oxcf.number_of_layers > 1 ||
michael@0	1478	cpi->common.refresh_alt_ref_frame ||
michael@0	1479	cpi->common.refresh_golden_frame)
michael@0	1480	{
michael@0	1481	*frame_over_shoot_limit = cpi->this_frame_target * 9 / 8;
michael@0	1482	*frame_under_shoot_limit = cpi->this_frame_target * 7 / 8;
michael@0	1483	}
michael@0	1484	else
michael@0	1485	{
michael@0	1486	/* For CBR take buffer fullness into account */
michael@0	1487	if (cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER)
michael@0	1488	{
michael@0	1489	if (cpi->buffer_level >= ((cpi->oxcf.optimal_buffer_level + cpi->oxcf.maximum_buffer_size) >> 1))
michael@0	1490	{
michael@0	1491	/* Buffer is too full so relax overshoot and tighten
michael@0	1492	* undershoot
michael@0	1493	*/
michael@0	1494	*frame_over_shoot_limit = cpi->this_frame_target * 12 / 8;
michael@0	1495	*frame_under_shoot_limit = cpi->this_frame_target * 6 / 8;
michael@0	1496	}
michael@0	1497	else if (cpi->buffer_level <= (cpi->oxcf.optimal_buffer_level >> 1))
michael@0	1498	{
michael@0	1499	/* Buffer is too low so relax undershoot and tighten
michael@0	1500	* overshoot
michael@0	1501	*/
michael@0	1502	*frame_over_shoot_limit = cpi->this_frame_target * 10 / 8;
michael@0	1503	*frame_under_shoot_limit = cpi->this_frame_target * 4 / 8;
michael@0	1504	}
michael@0	1505	else
michael@0	1506	{
michael@0	1507	*frame_over_shoot_limit = cpi->this_frame_target * 11 / 8;
michael@0	1508	*frame_under_shoot_limit = cpi->this_frame_target * 5 / 8;
michael@0	1509	}
michael@0	1510	}
michael@0	1511	/* VBR and CQ mode */
michael@0	1512	/* Note that tighter restrictions here can help quality
michael@0	1513	* but hurt encode speed
michael@0	1514	*/
michael@0	1515	else
michael@0	1516	{
michael@0	1517	/* Stron overshoot limit for constrained quality */
michael@0	1518	if (cpi->oxcf.end_usage == USAGE_CONSTRAINED_QUALITY)
michael@0	1519	{
michael@0	1520	*frame_over_shoot_limit = cpi->this_frame_target * 11 / 8;
michael@0	1521	*frame_under_shoot_limit = cpi->this_frame_target * 2 / 8;
michael@0	1522	}
michael@0	1523	else
michael@0	1524	{
michael@0	1525	*frame_over_shoot_limit = cpi->this_frame_target * 11 / 8;
michael@0	1526	*frame_under_shoot_limit = cpi->this_frame_target * 5 / 8;
michael@0	1527	}
michael@0	1528	}
michael@0	1529	}
michael@0	1530	}
michael@0	1531
michael@0	1532	/* For very small rate targets where the fractional adjustment
michael@0	1533	* (eg * 7/8) may be tiny make sure there is at least a minimum
michael@0	1534	* range.
michael@0	1535	*/
michael@0	1536	*frame_over_shoot_limit += 200;
michael@0	1537	*frame_under_shoot_limit -= 200;
michael@0	1538	if ( *frame_under_shoot_limit < 0 )
michael@0	1539	*frame_under_shoot_limit = 0;
michael@0	1540
michael@0	1541	}
michael@0	1542	}
michael@0	1543
michael@0	1544
michael@0	1545	/* return of 0 means drop frame */
michael@0	1546	int vp8_pick_frame_size(VP8_COMP *cpi)
michael@0	1547	{
michael@0	1548	VP8_COMMON *cm = &cpi->common;
michael@0	1549
michael@0	1550	if (cm->frame_type == KEY_FRAME)
michael@0	1551	calc_iframe_target_size(cpi);
michael@0	1552	else
michael@0	1553	{
michael@0	1554	calc_pframe_target_size(cpi);
michael@0	1555
michael@0	1556	/* Check if we're dropping the frame: */
michael@0	1557	if (cpi->drop_frame)
michael@0	1558	{
michael@0	1559	cpi->drop_frame = 0;
michael@0	1560	return 0;
michael@0	1561	}
michael@0	1562	}
michael@0	1563	return 1;
michael@0	1564	}