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Unified Diff: third_party/libvpx/source/libvpx/vp8/encoder/ratectrl.c

Issue 1158913006: Move libvpx from DEPS to src (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: add DEPS file with #include paths Created 5 years, 7 months ago
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Index: third_party/libvpx/source/libvpx/vp8/encoder/ratectrl.c
diff --git a/third_party/libvpx/source/libvpx/vp8/encoder/ratectrl.c b/third_party/libvpx/source/libvpx/vp8/encoder/ratectrl.c
new file mode 100644
index 0000000000000000000000000000000000000000..2ac7475171a326de4293d6864de04e82b8633b5e
--- /dev/null
+++ b/third_party/libvpx/source/libvpx/vp8/encoder/ratectrl.c
@@ -0,0 +1,1607 @@
+/*
+ * Copyright (c) 2010 The WebM project authors. All Rights Reserved.
+ *
+ * Use of this source code is governed by a BSD-style license
+ * that can be found in the LICENSE file in the root of the source
+ * tree. An additional intellectual property rights grant can be found
+ * in the file PATENTS. All contributing project authors may
+ * be found in the AUTHORS file in the root of the source tree.
+ */
+
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <limits.h>
+#include <assert.h>
+
+#include "math.h"
+#include "vp8/common/common.h"
+#include "ratectrl.h"
+#include "vp8/common/entropymode.h"
+#include "vpx_mem/vpx_mem.h"
+#include "vp8/common/systemdependent.h"
+#include "encodemv.h"
+
+
+#define MIN_BPB_FACTOR 0.01
+#define MAX_BPB_FACTOR 50
+
+extern const MB_PREDICTION_MODE vp8_mode_order[MAX_MODES];
+
+
+
+#ifdef MODE_STATS
+extern int y_modes[5];
+extern int uv_modes[4];
+extern int b_modes[10];
+
+extern int inter_y_modes[10];
+extern int inter_uv_modes[4];
+extern int inter_b_modes[10];
+#endif
+
+/* Bits Per MB at different Q (Multiplied by 512) */
+#define BPER_MB_NORMBITS 9
+
+/* Work in progress recalibration of baseline rate tables based on
+ * the assumption that bits per mb is inversely proportional to the
+ * quantizer value.
+ */
+const int vp8_bits_per_mb[2][QINDEX_RANGE] =
+{
+ /* Intra case 450000/Qintra */
+ {
+ 1125000,900000, 750000, 642857, 562500, 500000, 450000, 450000,
+ 409090, 375000, 346153, 321428, 300000, 281250, 264705, 264705,
+ 250000, 236842, 225000, 225000, 214285, 214285, 204545, 204545,
+ 195652, 195652, 187500, 180000, 180000, 173076, 166666, 160714,
+ 155172, 150000, 145161, 140625, 136363, 132352, 128571, 125000,
+ 121621, 121621, 118421, 115384, 112500, 109756, 107142, 104651,
+ 102272, 100000, 97826, 97826, 95744, 93750, 91836, 90000,
+ 88235, 86538, 84905, 83333, 81818, 80357, 78947, 77586,
+ 76271, 75000, 73770, 72580, 71428, 70312, 69230, 68181,
+ 67164, 66176, 65217, 64285, 63380, 62500, 61643, 60810,
+ 60000, 59210, 59210, 58441, 57692, 56962, 56250, 55555,
+ 54878, 54216, 53571, 52941, 52325, 51724, 51136, 50561,
+ 49450, 48387, 47368, 46875, 45918, 45000, 44554, 44117,
+ 43269, 42452, 41666, 40909, 40178, 39473, 38793, 38135,
+ 36885, 36290, 35714, 35156, 34615, 34090, 33582, 33088,
+ 32608, 32142, 31468, 31034, 30405, 29801, 29220, 28662,
+ },
+ /* Inter case 285000/Qinter */
+ {
+ 712500, 570000, 475000, 407142, 356250, 316666, 285000, 259090,
+ 237500, 219230, 203571, 190000, 178125, 167647, 158333, 150000,
+ 142500, 135714, 129545, 123913, 118750, 114000, 109615, 105555,
+ 101785, 98275, 95000, 91935, 89062, 86363, 83823, 81428,
+ 79166, 77027, 75000, 73076, 71250, 69512, 67857, 66279,
+ 64772, 63333, 61956, 60638, 59375, 58163, 57000, 55882,
+ 54807, 53773, 52777, 51818, 50892, 50000, 49137, 47500,
+ 45967, 44531, 43181, 41911, 40714, 39583, 38513, 37500,
+ 36538, 35625, 34756, 33928, 33139, 32386, 31666, 30978,
+ 30319, 29687, 29081, 28500, 27941, 27403, 26886, 26388,
+ 25909, 25446, 25000, 24568, 23949, 23360, 22800, 22265,
+ 21755, 21268, 20802, 20357, 19930, 19520, 19127, 18750,
+ 18387, 18037, 17701, 17378, 17065, 16764, 16473, 16101,
+ 15745, 15405, 15079, 14766, 14467, 14179, 13902, 13636,
+ 13380, 13133, 12895, 12666, 12445, 12179, 11924, 11632,
+ 11445, 11220, 11003, 10795, 10594, 10401, 10215, 10035,
+ }
+};
+
+static const int kf_boost_qadjustment[QINDEX_RANGE] =
+{
+ 128, 129, 130, 131, 132, 133, 134, 135,
+ 136, 137, 138, 139, 140, 141, 142, 143,
+ 144, 145, 146, 147, 148, 149, 150, 151,
+ 152, 153, 154, 155, 156, 157, 158, 159,
+ 160, 161, 162, 163, 164, 165, 166, 167,
+ 168, 169, 170, 171, 172, 173, 174, 175,
+ 176, 177, 178, 179, 180, 181, 182, 183,
+ 184, 185, 186, 187, 188, 189, 190, 191,
+ 192, 193, 194, 195, 196, 197, 198, 199,
+ 200, 200, 201, 201, 202, 203, 203, 203,
+ 204, 204, 205, 205, 206, 206, 207, 207,
+ 208, 208, 209, 209, 210, 210, 211, 211,
+ 212, 212, 213, 213, 214, 214, 215, 215,
+ 216, 216, 217, 217, 218, 218, 219, 219,
+ 220, 220, 220, 220, 220, 220, 220, 220,
+ 220, 220, 220, 220, 220, 220, 220, 220,
+};
+
+/* #define GFQ_ADJUSTMENT (Q+100) */
+#define GFQ_ADJUSTMENT vp8_gf_boost_qadjustment[Q]
+const int vp8_gf_boost_qadjustment[QINDEX_RANGE] =
+{
+ 80, 82, 84, 86, 88, 90, 92, 94,
+ 96, 97, 98, 99, 100, 101, 102, 103,
+ 104, 105, 106, 107, 108, 109, 110, 111,
+ 112, 113, 114, 115, 116, 117, 118, 119,
+ 120, 121, 122, 123, 124, 125, 126, 127,
+ 128, 129, 130, 131, 132, 133, 134, 135,
+ 136, 137, 138, 139, 140, 141, 142, 143,
+ 144, 145, 146, 147, 148, 149, 150, 151,
+ 152, 153, 154, 155, 156, 157, 158, 159,
+ 160, 161, 162, 163, 164, 165, 166, 167,
+ 168, 169, 170, 171, 172, 173, 174, 175,
+ 176, 177, 178, 179, 180, 181, 182, 183,
+ 184, 184, 185, 185, 186, 186, 187, 187,
+ 188, 188, 189, 189, 190, 190, 191, 191,
+ 192, 192, 193, 193, 194, 194, 194, 194,
+ 195, 195, 196, 196, 197, 197, 198, 198
+};
+
+/*
+const int vp8_gf_boost_qadjustment[QINDEX_RANGE] =
+{
+ 100,101,102,103,104,105,105,106,
+ 106,107,107,108,109,109,110,111,
+ 112,113,114,115,116,117,118,119,
+ 120,121,122,123,124,125,126,127,
+ 128,129,130,131,132,133,134,135,
+ 136,137,138,139,140,141,142,143,
+ 144,145,146,147,148,149,150,151,
+ 152,153,154,155,156,157,158,159,
+ 160,161,162,163,164,165,166,167,
+ 168,169,170,170,171,171,172,172,
+ 173,173,173,174,174,174,175,175,
+ 175,176,176,176,177,177,177,177,
+ 178,178,179,179,180,180,181,181,
+ 182,182,183,183,184,184,185,185,
+ 186,186,187,187,188,188,189,189,
+ 190,190,191,191,192,192,193,193,
+};
+*/
+
+static const int kf_gf_boost_qlimits[QINDEX_RANGE] =
+{
+ 150, 155, 160, 165, 170, 175, 180, 185,
+ 190, 195, 200, 205, 210, 215, 220, 225,
+ 230, 235, 240, 245, 250, 255, 260, 265,
+ 270, 275, 280, 285, 290, 295, 300, 305,
+ 310, 320, 330, 340, 350, 360, 370, 380,
+ 390, 400, 410, 420, 430, 440, 450, 460,
+ 470, 480, 490, 500, 510, 520, 530, 540,
+ 550, 560, 570, 580, 590, 600, 600, 600,
+ 600, 600, 600, 600, 600, 600, 600, 600,
+ 600, 600, 600, 600, 600, 600, 600, 600,
+ 600, 600, 600, 600, 600, 600, 600, 600,
+ 600, 600, 600, 600, 600, 600, 600, 600,
+ 600, 600, 600, 600, 600, 600, 600, 600,
+ 600, 600, 600, 600, 600, 600, 600, 600,
+ 600, 600, 600, 600, 600, 600, 600, 600,
+ 600, 600, 600, 600, 600, 600, 600, 600,
+};
+
+static const int gf_adjust_table[101] =
+{
+ 100,
+ 115, 130, 145, 160, 175, 190, 200, 210, 220, 230,
+ 240, 260, 270, 280, 290, 300, 310, 320, 330, 340,
+ 350, 360, 370, 380, 390, 400, 400, 400, 400, 400,
+ 400, 400, 400, 400, 400, 400, 400, 400, 400, 400,
+ 400, 400, 400, 400, 400, 400, 400, 400, 400, 400,
+ 400, 400, 400, 400, 400, 400, 400, 400, 400, 400,
+ 400, 400, 400, 400, 400, 400, 400, 400, 400, 400,
+ 400, 400, 400, 400, 400, 400, 400, 400, 400, 400,
+ 400, 400, 400, 400, 400, 400, 400, 400, 400, 400,
+ 400, 400, 400, 400, 400, 400, 400, 400, 400, 400,
+};
+
+static const int gf_intra_usage_adjustment[20] =
+{
+ 125, 120, 115, 110, 105, 100, 95, 85, 80, 75,
+ 70, 65, 60, 55, 50, 50, 50, 50, 50, 50,
+};
+
+static const int gf_interval_table[101] =
+{
+ 7,
+ 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
+ 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
+ 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
+ 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
+ 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
+ 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
+ 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
+ 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
+ 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
+ 11, 11, 11, 11, 11, 11, 11, 11, 11, 11,
+};
+
+static const unsigned int prior_key_frame_weight[KEY_FRAME_CONTEXT] = { 1, 2, 3, 4, 5 };
+
+
+void vp8_save_coding_context(VP8_COMP *cpi)
+{
+ CODING_CONTEXT *const cc = & cpi->coding_context;
+
+ /* Stores a snapshot of key state variables which can subsequently be
+ * restored with a call to vp8_restore_coding_context. These functions are
+ * intended for use in a re-code loop in vp8_compress_frame where the
+ * quantizer value is adjusted between loop iterations.
+ */
+
+ cc->frames_since_key = cpi->frames_since_key;
+ cc->filter_level = cpi->common.filter_level;
+ cc->frames_till_gf_update_due = cpi->frames_till_gf_update_due;
+ cc->frames_since_golden = cpi->frames_since_golden;
+
+ vp8_copy(cc->mvc, cpi->common.fc.mvc);
+ vp8_copy(cc->mvcosts, cpi->rd_costs.mvcosts);
+
+ vp8_copy(cc->ymode_prob, cpi->common.fc.ymode_prob);
+ vp8_copy(cc->uv_mode_prob, cpi->common.fc.uv_mode_prob);
+
+ vp8_copy(cc->ymode_count, cpi->mb.ymode_count);
+ vp8_copy(cc->uv_mode_count, cpi->mb.uv_mode_count);
+
+
+ /* Stats */
+#ifdef MODE_STATS
+ vp8_copy(cc->y_modes, y_modes);
+ vp8_copy(cc->uv_modes, uv_modes);
+ vp8_copy(cc->b_modes, b_modes);
+ vp8_copy(cc->inter_y_modes, inter_y_modes);
+ vp8_copy(cc->inter_uv_modes, inter_uv_modes);
+ vp8_copy(cc->inter_b_modes, inter_b_modes);
+#endif
+
+ cc->this_frame_percent_intra = cpi->this_frame_percent_intra;
+}
+
+
+void vp8_restore_coding_context(VP8_COMP *cpi)
+{
+ CODING_CONTEXT *const cc = & cpi->coding_context;
+
+ /* Restore key state variables to the snapshot state stored in the
+ * previous call to vp8_save_coding_context.
+ */
+
+ cpi->frames_since_key = cc->frames_since_key;
+ cpi->common.filter_level = cc->filter_level;
+ cpi->frames_till_gf_update_due = cc->frames_till_gf_update_due;
+ cpi->frames_since_golden = cc->frames_since_golden;
+
+ vp8_copy(cpi->common.fc.mvc, cc->mvc);
+
+ vp8_copy(cpi->rd_costs.mvcosts, cc->mvcosts);
+
+ vp8_copy(cpi->common.fc.ymode_prob, cc->ymode_prob);
+ vp8_copy(cpi->common.fc.uv_mode_prob, cc->uv_mode_prob);
+
+ vp8_copy(cpi->mb.ymode_count, cc->ymode_count);
+ vp8_copy(cpi->mb.uv_mode_count, cc->uv_mode_count);
+
+ /* Stats */
+#ifdef MODE_STATS
+ vp8_copy(y_modes, cc->y_modes);
+ vp8_copy(uv_modes, cc->uv_modes);
+ vp8_copy(b_modes, cc->b_modes);
+ vp8_copy(inter_y_modes, cc->inter_y_modes);
+ vp8_copy(inter_uv_modes, cc->inter_uv_modes);
+ vp8_copy(inter_b_modes, cc->inter_b_modes);
+#endif
+
+
+ cpi->this_frame_percent_intra = cc->this_frame_percent_intra;
+}
+
+
+void vp8_setup_key_frame(VP8_COMP *cpi)
+{
+ /* Setup for Key frame: */
+
+ vp8_default_coef_probs(& cpi->common);
+
+ memcpy(cpi->common.fc.mvc, vp8_default_mv_context, sizeof(vp8_default_mv_context));
+ {
+ int flag[2] = {1, 1};
+ vp8_build_component_cost_table(cpi->mb.mvcost, (const MV_CONTEXT *) cpi->common.fc.mvc, flag);
+ }
+
+ /* Make sure we initialize separate contexts for altref,gold, and normal.
+ * TODO shouldn't need 3 different copies of structure to do this!
+ */
+ memcpy(&cpi->lfc_a, &cpi->common.fc, sizeof(cpi->common.fc));
+ memcpy(&cpi->lfc_g, &cpi->common.fc, sizeof(cpi->common.fc));
+ memcpy(&cpi->lfc_n, &cpi->common.fc, sizeof(cpi->common.fc));
+
+ cpi->common.filter_level = cpi->common.base_qindex * 3 / 8 ;
+
+ /* Provisional interval before next GF */
+ if (cpi->auto_gold)
+ cpi->frames_till_gf_update_due = cpi->baseline_gf_interval;
+ else
+ cpi->frames_till_gf_update_due = DEFAULT_GF_INTERVAL;
+
+ cpi->common.refresh_golden_frame = 1;
+ cpi->common.refresh_alt_ref_frame = 1;
+}
+
+
+static int estimate_bits_at_q(int frame_kind, int Q, int MBs,
+ double correction_factor)
+{
+ int Bpm = (int)(.5 + correction_factor * vp8_bits_per_mb[frame_kind][Q]);
+
+ /* Attempt to retain reasonable accuracy without overflow. The cutoff is
+ * chosen such that the maximum product of Bpm and MBs fits 31 bits. The
+ * largest Bpm takes 20 bits.
+ */
+ if (MBs > (1 << 11))
+ return (Bpm >> BPER_MB_NORMBITS) * MBs;
+ else
+ return (Bpm * MBs) >> BPER_MB_NORMBITS;
+}
+
+
+static void calc_iframe_target_size(VP8_COMP *cpi)
+{
+ /* boost defaults to half second */
+ int kf_boost;
+ uint64_t target;
+
+ /* Clear down mmx registers to allow floating point in what follows */
+ vp8_clear_system_state();
+
+ if (cpi->oxcf.fixed_q >= 0)
+ {
+ int Q = cpi->oxcf.key_q;
+
+ target = estimate_bits_at_q(INTRA_FRAME, Q, cpi->common.MBs,
+ cpi->key_frame_rate_correction_factor);
+ }
+ else if (cpi->pass == 2)
+ {
+ /* New Two pass RC */
+ target = cpi->per_frame_bandwidth;
+ }
+ /* First Frame is a special case */
+ else if (cpi->common.current_video_frame == 0)
+ {
+ /* 1 Pass there is no information on which to base size so use
+ * bandwidth per second * fraction of the initial buffer
+ * level
+ */
+ target = cpi->oxcf.starting_buffer_level / 2;
+
+ if(target > cpi->oxcf.target_bandwidth * 3 / 2)
+ target = cpi->oxcf.target_bandwidth * 3 / 2;
+ }
+ else
+ {
+ /* if this keyframe was forced, use a more recent Q estimate */
+ int Q = (cpi->common.frame_flags & FRAMEFLAGS_KEY)
+ ? cpi->avg_frame_qindex : cpi->ni_av_qi;
+
+ int initial_boost = 32; /* |3.0 * per_frame_bandwidth| */
+ /* Boost depends somewhat on frame rate: only used for 1 layer case. */
+ if (cpi->oxcf.number_of_layers == 1) {
+ kf_boost = MAX(initial_boost, (int)(2 * cpi->output_framerate - 16));
+ }
+ else {
+ /* Initial factor: set target size to: |3.0 * per_frame_bandwidth|. */
+ kf_boost = initial_boost;
+ }
+
+ /* adjustment up based on q: this factor ranges from ~1.2 to 2.2. */
+ kf_boost = kf_boost * kf_boost_qadjustment[Q] / 100;
+
+ /* frame separation adjustment ( down) */
+ if (cpi->frames_since_key < cpi->output_framerate / 2)
+ kf_boost = (int)(kf_boost
+ * cpi->frames_since_key / (cpi->output_framerate / 2));
+
+ /* Minimal target size is |2* per_frame_bandwidth|. */
+ if (kf_boost < 16)
+ kf_boost = 16;
+
+ target = ((16 + kf_boost) * cpi->per_frame_bandwidth) >> 4;
+ }
+
+
+ if (cpi->oxcf.rc_max_intra_bitrate_pct)
+ {
+ unsigned int max_rate = cpi->per_frame_bandwidth
+ * cpi->oxcf.rc_max_intra_bitrate_pct / 100;
+
+ if (target > max_rate)
+ target = max_rate;
+ }
+
+ cpi->this_frame_target = (int)target;
+
+ /* TODO: if we separate rate targeting from Q targetting, move this.
+ * Reset the active worst quality to the baseline value for key frames.
+ */
+ if (cpi->pass != 2)
+ cpi->active_worst_quality = cpi->worst_quality;
+
+#if 0
+ {
+ FILE *f;
+
+ f = fopen("kf_boost.stt", "a");
+ fprintf(f, " %8u %10d %10d %10d\n",
+ cpi->common.current_video_frame, cpi->gfu_boost, cpi->baseline_gf_interval, cpi->source_alt_ref_pending);
+
+ fclose(f);
+ }
+#endif
+}
+
+
+/* Do the best we can to define the parameters for the next GF based on what
+ * information we have available.
+ */
+static void calc_gf_params(VP8_COMP *cpi)
+{
+ int Q = (cpi->oxcf.fixed_q < 0) ? cpi->last_q[INTER_FRAME] : cpi->oxcf.fixed_q;
+ int Boost = 0;
+
+ int gf_frame_useage = 0; /* Golden frame useage since last GF */
+ int tot_mbs = cpi->recent_ref_frame_usage[INTRA_FRAME] +
+ cpi->recent_ref_frame_usage[LAST_FRAME] +
+ cpi->recent_ref_frame_usage[GOLDEN_FRAME] +
+ cpi->recent_ref_frame_usage[ALTREF_FRAME];
+
+ int pct_gf_active = (100 * cpi->gf_active_count) / (cpi->common.mb_rows * cpi->common.mb_cols);
+
+ if (tot_mbs)
+ gf_frame_useage = (cpi->recent_ref_frame_usage[GOLDEN_FRAME] + cpi->recent_ref_frame_usage[ALTREF_FRAME]) * 100 / tot_mbs;
+
+ if (pct_gf_active > gf_frame_useage)
+ gf_frame_useage = pct_gf_active;
+
+ /* Not two pass */
+ if (cpi->pass != 2)
+ {
+ /* Single Pass lagged mode: TBD */
+ if (0)
+ {
+ }
+
+ /* Single Pass compression: Has to use current and historical data */
+ else
+ {
+#if 0
+ /* Experimental code */
+ int index = cpi->one_pass_frame_index;
+ int frames_to_scan = (cpi->max_gf_interval <= MAX_LAG_BUFFERS) ? cpi->max_gf_interval : MAX_LAG_BUFFERS;
+
+ /* ************** Experimental code - incomplete */
+ /*
+ double decay_val = 1.0;
+ double IIAccumulator = 0.0;
+ double last_iiaccumulator = 0.0;
+ double IIRatio;
+
+ cpi->one_pass_frame_index = cpi->common.current_video_frame%MAX_LAG_BUFFERS;
+
+ for ( i = 0; i < (frames_to_scan - 1); i++ )
+ {
+ if ( index < 0 )
+ index = MAX_LAG_BUFFERS;
+ index --;
+
+ if ( cpi->one_pass_frame_stats[index].frame_coded_error > 0.0 )
+ {
+ IIRatio = cpi->one_pass_frame_stats[index].frame_intra_error / cpi->one_pass_frame_stats[index].frame_coded_error;
+
+ if ( IIRatio > 30.0 )
+ IIRatio = 30.0;
+ }
+ else
+ IIRatio = 30.0;
+
+ IIAccumulator += IIRatio * decay_val;
+
+ decay_val = decay_val * cpi->one_pass_frame_stats[index].frame_pcnt_inter;
+
+ if ( (i > MIN_GF_INTERVAL) &&
+ ((IIAccumulator - last_iiaccumulator) < 2.0) )
+ {
+ break;
+ }
+ last_iiaccumulator = IIAccumulator;
+ }
+
+ Boost = IIAccumulator*100.0/16.0;
+ cpi->baseline_gf_interval = i;
+
+ */
+#else
+
+ /*************************************************************/
+ /* OLD code */
+
+ /* Adjust boost based upon ambient Q */
+ Boost = GFQ_ADJUSTMENT;
+
+ /* Adjust based upon most recently measure intra useage */
+ Boost = Boost * gf_intra_usage_adjustment[(cpi->this_frame_percent_intra < 15) ? cpi->this_frame_percent_intra : 14] / 100;
+
+ /* Adjust gf boost based upon GF usage since last GF */
+ Boost = Boost * gf_adjust_table[gf_frame_useage] / 100;
+#endif
+ }
+
+ /* golden frame boost without recode loop often goes awry. be
+ * safe by keeping numbers down.
+ */
+ if (!cpi->sf.recode_loop)
+ {
+ if (cpi->compressor_speed == 2)
+ Boost = Boost / 2;
+ }
+
+ /* Apply an upper limit based on Q for 1 pass encodes */
+ if (Boost > kf_gf_boost_qlimits[Q] && (cpi->pass == 0))
+ Boost = kf_gf_boost_qlimits[Q];
+
+ /* Apply lower limits to boost. */
+ else if (Boost < 110)
+ Boost = 110;
+
+ /* Note the boost used */
+ cpi->last_boost = Boost;
+
+ }
+
+ /* Estimate next interval
+ * This is updated once the real frame size/boost is known.
+ */
+ if (cpi->oxcf.fixed_q == -1)
+ {
+ if (cpi->pass == 2) /* 2 Pass */
+ {
+ cpi->frames_till_gf_update_due = cpi->baseline_gf_interval;
+ }
+ else /* 1 Pass */
+ {
+ cpi->frames_till_gf_update_due = cpi->baseline_gf_interval;
+
+ if (cpi->last_boost > 750)
+ cpi->frames_till_gf_update_due++;
+
+ if (cpi->last_boost > 1000)
+ cpi->frames_till_gf_update_due++;
+
+ if (cpi->last_boost > 1250)
+ cpi->frames_till_gf_update_due++;
+
+ if (cpi->last_boost >= 1500)
+ cpi->frames_till_gf_update_due ++;
+
+ if (gf_interval_table[gf_frame_useage] > cpi->frames_till_gf_update_due)
+ cpi->frames_till_gf_update_due = gf_interval_table[gf_frame_useage];
+
+ if (cpi->frames_till_gf_update_due > cpi->max_gf_interval)
+ cpi->frames_till_gf_update_due = cpi->max_gf_interval;
+ }
+ }
+ else
+ cpi->frames_till_gf_update_due = cpi->baseline_gf_interval;
+
+ /* ARF on or off */
+ if (cpi->pass != 2)
+ {
+ /* For now Alt ref is not allowed except in 2 pass modes. */
+ cpi->source_alt_ref_pending = 0;
+
+ /*if ( cpi->oxcf.fixed_q == -1)
+ {
+ if ( cpi->oxcf.play_alternate && (cpi->last_boost > (100 + (AF_THRESH*cpi->frames_till_gf_update_due)) ) )
+ cpi->source_alt_ref_pending = 1;
+ else
+ cpi->source_alt_ref_pending = 0;
+ }*/
+ }
+}
+
+
+static void calc_pframe_target_size(VP8_COMP *cpi)
+{
+ int min_frame_target;
+ int old_per_frame_bandwidth = cpi->per_frame_bandwidth;
+
+ if ( cpi->current_layer > 0)
+ cpi->per_frame_bandwidth =
+ cpi->layer_context[cpi->current_layer].avg_frame_size_for_layer;
+
+ min_frame_target = 0;
+
+ if (cpi->pass == 2)
+ {
+ min_frame_target = cpi->min_frame_bandwidth;
+
+ if (min_frame_target < (cpi->av_per_frame_bandwidth >> 5))
+ min_frame_target = cpi->av_per_frame_bandwidth >> 5;
+ }
+ else if (min_frame_target < cpi->per_frame_bandwidth / 4)
+ min_frame_target = cpi->per_frame_bandwidth / 4;
+
+
+ /* Special alt reference frame case */
+ if((cpi->common.refresh_alt_ref_frame) && (cpi->oxcf.number_of_layers == 1))
+ {
+ if (cpi->pass == 2)
+ {
+ /* Per frame bit target for the alt ref frame */
+ cpi->per_frame_bandwidth = cpi->twopass.gf_bits;
+ cpi->this_frame_target = cpi->per_frame_bandwidth;
+ }
+
+ /* One Pass ??? TBD */
+ }
+
+ /* Normal frames (gf,and inter) */
+ else
+ {
+ /* 2 pass */
+ if (cpi->pass == 2)
+ {
+ cpi->this_frame_target = cpi->per_frame_bandwidth;
+ }
+ /* 1 pass */
+ else
+ {
+ int Adjustment;
+ /* Make rate adjustment to recover bits spent in key frame
+ * Test to see if the key frame inter data rate correction
+ * should still be in force
+ */
+ if (cpi->kf_overspend_bits > 0)
+ {
+ Adjustment = (cpi->kf_bitrate_adjustment <= cpi->kf_overspend_bits) ? cpi->kf_bitrate_adjustment : cpi->kf_overspend_bits;
+
+ if (Adjustment > (cpi->per_frame_bandwidth - min_frame_target))
+ Adjustment = (cpi->per_frame_bandwidth - min_frame_target);
+
+ cpi->kf_overspend_bits -= Adjustment;
+
+ /* Calculate an inter frame bandwidth target for the next
+ * few frames designed to recover any extra bits spent on
+ * the key frame.
+ */
+ cpi->this_frame_target = cpi->per_frame_bandwidth - Adjustment;
+
+ if (cpi->this_frame_target < min_frame_target)
+ cpi->this_frame_target = min_frame_target;
+ }
+ else
+ cpi->this_frame_target = cpi->per_frame_bandwidth;
+
+ /* If appropriate make an adjustment to recover bits spent on a
+ * recent GF
+ */
+ if ((cpi->gf_overspend_bits > 0) && (cpi->this_frame_target > min_frame_target))
+ {
+ Adjustment = (cpi->non_gf_bitrate_adjustment <= cpi->gf_overspend_bits) ? cpi->non_gf_bitrate_adjustment : cpi->gf_overspend_bits;
+
+ if (Adjustment > (cpi->this_frame_target - min_frame_target))
+ Adjustment = (cpi->this_frame_target - min_frame_target);
+
+ cpi->gf_overspend_bits -= Adjustment;
+ cpi->this_frame_target -= Adjustment;
+ }
+
+ /* Apply small + and - boosts for non gf frames */
+ if ((cpi->last_boost > 150) && (cpi->frames_till_gf_update_due > 0) &&
+ (cpi->current_gf_interval >= (MIN_GF_INTERVAL << 1)))
+ {
+ /* % Adjustment limited to the range 1% to 10% */
+ Adjustment = (cpi->last_boost - 100) >> 5;
+
+ if (Adjustment < 1)
+ Adjustment = 1;
+ else if (Adjustment > 10)
+ Adjustment = 10;
+
+ /* Convert to bits */
+ Adjustment = (cpi->this_frame_target * Adjustment) / 100;
+
+ if (Adjustment > (cpi->this_frame_target - min_frame_target))
+ Adjustment = (cpi->this_frame_target - min_frame_target);
+
+ if (cpi->frames_since_golden == (cpi->current_gf_interval >> 1))
+ {
+ Adjustment = (cpi->current_gf_interval - 1) * Adjustment;
+ // Limit adjustment to 10% of current target.
+ if (Adjustment > (10 * cpi->this_frame_target) / 100)
+ Adjustment = (10 * cpi->this_frame_target) / 100;
+ cpi->this_frame_target += Adjustment;
+ }
+ else
+ cpi->this_frame_target -= Adjustment;
+ }
+ }
+ }
+
+ /* Sanity check that the total sum of adjustments is not above the
+ * maximum allowed That is that having allowed for KF and GF penalties
+ * we have not pushed the current interframe target to low. If the
+ * adjustment we apply here is not capable of recovering all the extra
+ * bits we have spent in the KF or GF then the remainder will have to
+ * be recovered over a longer time span via other buffer / rate control
+ * mechanisms.
+ */
+ if (cpi->this_frame_target < min_frame_target)
+ cpi->this_frame_target = min_frame_target;
+
+ if (!cpi->common.refresh_alt_ref_frame)
+ /* Note the baseline target data rate for this inter frame. */
+ cpi->inter_frame_target = cpi->this_frame_target;
+
+ /* One Pass specific code */
+ if (cpi->pass == 0)
+ {
+ /* Adapt target frame size with respect to any buffering constraints: */
+ if (cpi->buffered_mode)
+ {
+ int one_percent_bits = (int)
+ (1 + cpi->oxcf.optimal_buffer_level / 100);
+
+ if ((cpi->buffer_level < cpi->oxcf.optimal_buffer_level) ||
+ (cpi->bits_off_target < cpi->oxcf.optimal_buffer_level))
+ {
+ int percent_low = 0;
+
+ /* Decide whether or not we need to adjust the frame data
+ * rate target.
+ *
+ * If we are are below the optimal buffer fullness level
+ * and adherence to buffering constraints is important to
+ * the end usage then adjust the per frame target.
+ */
+ if ((cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER) &&
+ (cpi->buffer_level < cpi->oxcf.optimal_buffer_level))
+ {
+ percent_low = (int)
+ ((cpi->oxcf.optimal_buffer_level - cpi->buffer_level) /
+ one_percent_bits);
+ }
+ /* Are we overshooting the long term clip data rate... */
+ else if (cpi->bits_off_target < 0)
+ {
+ /* Adjust per frame data target downwards to compensate. */
+ percent_low = (int)(100 * -cpi->bits_off_target /
+ (cpi->total_byte_count * 8));
+ }
+
+ if (percent_low > cpi->oxcf.under_shoot_pct)
+ percent_low = cpi->oxcf.under_shoot_pct;
+ else if (percent_low < 0)
+ percent_low = 0;
+
+ /* lower the target bandwidth for this frame. */
+ cpi->this_frame_target -=
+ (cpi->this_frame_target * percent_low) / 200;
+
+ /* Are we using allowing control of active_worst_allowed_q
+ * according to buffer level.
+ */
+ if (cpi->auto_worst_q && cpi->ni_frames > 150)
+ {
+ int64_t critical_buffer_level;
+
+ /* For streaming applications the most important factor is
+ * cpi->buffer_level as this takes into account the
+ * specified short term buffering constraints. However,
+ * hitting the long term clip data rate target is also
+ * important.
+ */
+ if (cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER)
+ {
+ /* Take the smaller of cpi->buffer_level and
+ * cpi->bits_off_target
+ */
+ critical_buffer_level =
+ (cpi->buffer_level < cpi->bits_off_target)
+ ? cpi->buffer_level : cpi->bits_off_target;
+ }
+ /* For local file playback short term buffering constraints
+ * are less of an issue
+ */
+ else
+ {
+ /* Consider only how we are doing for the clip as a
+ * whole
+ */
+ critical_buffer_level = cpi->bits_off_target;
+ }
+
+ /* Set the active worst quality based upon the selected
+ * buffer fullness number.
+ */
+ if (critical_buffer_level < cpi->oxcf.optimal_buffer_level)
+ {
+ if ( critical_buffer_level >
+ (cpi->oxcf.optimal_buffer_level >> 2) )
+ {
+ int64_t qadjustment_range =
+ cpi->worst_quality - cpi->ni_av_qi;
+ int64_t above_base =
+ (critical_buffer_level -
+ (cpi->oxcf.optimal_buffer_level >> 2));
+
+ /* Step active worst quality down from
+ * cpi->ni_av_qi when (critical_buffer_level ==
+ * cpi->optimal_buffer_level) to
+ * cpi->worst_quality when
+ * (critical_buffer_level ==
+ * cpi->optimal_buffer_level >> 2)
+ */
+ cpi->active_worst_quality =
+ cpi->worst_quality -
+ (int)((qadjustment_range * above_base) /
+ (cpi->oxcf.optimal_buffer_level*3>>2));
+ }
+ else
+ {
+ cpi->active_worst_quality = cpi->worst_quality;
+ }
+ }
+ else
+ {
+ cpi->active_worst_quality = cpi->ni_av_qi;
+ }
+ }
+ else
+ {
+ cpi->active_worst_quality = cpi->worst_quality;
+ }
+ }
+ else
+ {
+ int percent_high = 0;
+
+ if ((cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER)
+ && (cpi->buffer_level > cpi->oxcf.optimal_buffer_level))
+ {
+ percent_high = (int)((cpi->buffer_level
+ - cpi->oxcf.optimal_buffer_level)
+ / one_percent_bits);
+ }
+ else if (cpi->bits_off_target > cpi->oxcf.optimal_buffer_level)
+ {
+ percent_high = (int)((100 * cpi->bits_off_target)
+ / (cpi->total_byte_count * 8));
+ }
+
+ if (percent_high > cpi->oxcf.over_shoot_pct)
+ percent_high = cpi->oxcf.over_shoot_pct;
+ else if (percent_high < 0)
+ percent_high = 0;
+
+ cpi->this_frame_target += (cpi->this_frame_target *
+ percent_high) / 200;
+
+ /* Are we allowing control of active_worst_allowed_q according
+ * to buffer level.
+ */
+ if (cpi->auto_worst_q && cpi->ni_frames > 150)
+ {
+ /* When using the relaxed buffer model stick to the
+ * user specified value
+ */
+ cpi->active_worst_quality = cpi->ni_av_qi;
+ }
+ else
+ {
+ cpi->active_worst_quality = cpi->worst_quality;
+ }
+ }
+
+ /* Set active_best_quality to prevent quality rising too high */
+ cpi->active_best_quality = cpi->best_quality;
+
+ /* Worst quality obviously must not be better than best quality */
+ if (cpi->active_worst_quality <= cpi->active_best_quality)
+ cpi->active_worst_quality = cpi->active_best_quality + 1;
+
+ if(cpi->active_worst_quality > 127)
+ cpi->active_worst_quality = 127;
+ }
+ /* Unbuffered mode (eg. video conferencing) */
+ else
+ {
+ /* Set the active worst quality */
+ cpi->active_worst_quality = cpi->worst_quality;
+ }
+
+ /* Special trap for constrained quality mode
+ * "active_worst_quality" may never drop below cq level
+ * for any frame type.
+ */
+ if ( cpi->oxcf.end_usage == USAGE_CONSTRAINED_QUALITY &&
+ cpi->active_worst_quality < cpi->cq_target_quality)
+ {
+ cpi->active_worst_quality = cpi->cq_target_quality;
+ }
+ }
+
+ /* Test to see if we have to drop a frame
+ * The auto-drop frame code is only used in buffered mode.
+ * In unbufferd mode (eg vide conferencing) the descision to
+ * code or drop a frame is made outside the codec in response to real
+ * world comms or buffer considerations.
+ */
+ if (cpi->drop_frames_allowed &&
+ (cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER) &&
+ ((cpi->common.frame_type != KEY_FRAME)))
+ {
+ /* Check for a buffer underun-crisis in which case we have to drop
+ * a frame
+ */
+ if ((cpi->buffer_level < 0))
+ {
+#if 0
+ FILE *f = fopen("dec.stt", "a");
+ fprintf(f, "%10d %10d %10d %10d ***** BUFFER EMPTY\n",
+ (int) cpi->common.current_video_frame,
+ cpi->decimation_factor, cpi->common.horiz_scale,
+ (cpi->buffer_level * 100) / cpi->oxcf.optimal_buffer_level);
+ fclose(f);
+#endif
+ cpi->drop_frame = 1;
+
+ /* Update the buffer level variable. */
+ cpi->bits_off_target += cpi->av_per_frame_bandwidth;
+ if (cpi->bits_off_target > cpi->oxcf.maximum_buffer_size)
+ cpi->bits_off_target = (int)cpi->oxcf.maximum_buffer_size;
+ cpi->buffer_level = cpi->bits_off_target;
+
+ if (cpi->oxcf.number_of_layers > 1) {
+ unsigned int i;
+
+ // Propagate bits saved by dropping the frame to higher layers.
+ for (i = cpi->current_layer + 1; i < cpi->oxcf.number_of_layers;
+ i++) {
+ LAYER_CONTEXT *lc = &cpi->layer_context[i];
+ lc->bits_off_target += (int)(lc->target_bandwidth /
+ lc->framerate);
+ if (lc->bits_off_target > lc->maximum_buffer_size)
+ lc->bits_off_target = lc->maximum_buffer_size;
+ lc->buffer_level = lc->bits_off_target;
+ }
+ }
+ }
+ }
+
+ /* Adjust target frame size for Golden Frames: */
+ if (cpi->oxcf.error_resilient_mode == 0 &&
+ (cpi->frames_till_gf_update_due == 0) && !cpi->drop_frame)
+ {
+ int Q = (cpi->oxcf.fixed_q < 0) ? cpi->last_q[INTER_FRAME] : cpi->oxcf.fixed_q;
+
+ int gf_frame_useage = 0; /* Golden frame useage since last GF */
+ int tot_mbs = cpi->recent_ref_frame_usage[INTRA_FRAME] +
+ cpi->recent_ref_frame_usage[LAST_FRAME] +
+ cpi->recent_ref_frame_usage[GOLDEN_FRAME] +
+ cpi->recent_ref_frame_usage[ALTREF_FRAME];
+
+ int pct_gf_active = (100 * cpi->gf_active_count) / (cpi->common.mb_rows * cpi->common.mb_cols);
+
+ if (tot_mbs)
+ gf_frame_useage = (cpi->recent_ref_frame_usage[GOLDEN_FRAME] + cpi->recent_ref_frame_usage[ALTREF_FRAME]) * 100 / tot_mbs;
+
+ if (pct_gf_active > gf_frame_useage)
+ gf_frame_useage = pct_gf_active;
+
+ /* Is a fixed manual GF frequency being used */
+ if (cpi->auto_gold)
+ {
+ /* For one pass throw a GF if recent frame intra useage is
+ * low or the GF useage is high
+ */
+ if ((cpi->pass == 0) && (cpi->this_frame_percent_intra < 15 || gf_frame_useage >= 5))
+ cpi->common.refresh_golden_frame = 1;
+
+ /* Two pass GF descision */
+ else if (cpi->pass == 2)
+ cpi->common.refresh_golden_frame = 1;
+ }
+
+#if 0
+
+ /* Debug stats */
+ if (0)
+ {
+ FILE *f;
+
+ f = fopen("gf_useaget.stt", "a");
+ fprintf(f, " %8ld %10ld %10ld %10ld %10ld\n",
+ cpi->common.current_video_frame, cpi->gfu_boost, GFQ_ADJUSTMENT, cpi->gfu_boost, gf_frame_useage);
+ fclose(f);
+ }
+
+#endif
+
+ if (cpi->common.refresh_golden_frame == 1)
+ {
+#if 0
+
+ if (0)
+ {
+ FILE *f;
+
+ f = fopen("GFexit.stt", "a");
+ fprintf(f, "%8ld GF coded\n", cpi->common.current_video_frame);
+ fclose(f);
+ }
+
+#endif
+
+ if (cpi->auto_adjust_gold_quantizer)
+ {
+ calc_gf_params(cpi);
+ }
+
+ /* If we are using alternate ref instead of gf then do not apply the
+ * boost It will instead be applied to the altref update Jims
+ * modified boost
+ */
+ if (!cpi->source_alt_ref_active)
+ {
+ if (cpi->oxcf.fixed_q < 0)
+ {
+ if (cpi->pass == 2)
+ {
+ /* The spend on the GF is defined in the two pass
+ * code for two pass encodes
+ */
+ cpi->this_frame_target = cpi->per_frame_bandwidth;
+ }
+ else
+ {
+ int Boost = cpi->last_boost;
+ int frames_in_section = cpi->frames_till_gf_update_due + 1;
+ int allocation_chunks = (frames_in_section * 100) + (Boost - 100);
+ int bits_in_section = cpi->inter_frame_target * frames_in_section;
+
+ /* Normalize Altboost and allocations chunck down to
+ * prevent overflow
+ */
+ while (Boost > 1000)
+ {
+ Boost /= 2;
+ allocation_chunks /= 2;
+ }
+
+ /* Avoid loss of precision but avoid overflow */
+ if ((bits_in_section >> 7) > allocation_chunks)
+ cpi->this_frame_target = Boost * (bits_in_section / allocation_chunks);
+ else
+ cpi->this_frame_target = (Boost * bits_in_section) / allocation_chunks;
+ }
+ }
+ else
+ cpi->this_frame_target =
+ (estimate_bits_at_q(1, Q, cpi->common.MBs, 1.0)
+ * cpi->last_boost) / 100;
+
+ }
+ /* If there is an active ARF at this location use the minimum
+ * bits on this frame even if it is a contructed arf.
+ * The active maximum quantizer insures that an appropriate
+ * number of bits will be spent if needed for contstructed ARFs.
+ */
+ else
+ {
+ cpi->this_frame_target = 0;
+ }
+
+ cpi->current_gf_interval = cpi->frames_till_gf_update_due;
+
+ }
+ }
+
+ cpi->per_frame_bandwidth = old_per_frame_bandwidth;
+}
+
+
+void vp8_update_rate_correction_factors(VP8_COMP *cpi, int damp_var)
+{
+ int Q = cpi->common.base_qindex;
+ int correction_factor = 100;
+ double rate_correction_factor;
+ double adjustment_limit;
+
+ int projected_size_based_on_q = 0;
+
+ /* Clear down mmx registers to allow floating point in what follows */
+ vp8_clear_system_state();
+
+ if (cpi->common.frame_type == KEY_FRAME)
+ {
+ rate_correction_factor = cpi->key_frame_rate_correction_factor;
+ }
+ else
+ {
+ if (cpi->oxcf.number_of_layers == 1 &&
+ (cpi->common.refresh_alt_ref_frame ||
+ cpi->common.refresh_golden_frame))
+ rate_correction_factor = cpi->gf_rate_correction_factor;
+ else
+ rate_correction_factor = cpi->rate_correction_factor;
+ }
+
+ /* Work out how big we would have expected the frame to be at this Q
+ * given the current correction factor. Stay in double to avoid int
+ * overflow when values are large
+ */
+ 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));
+
+ /* Make some allowance for cpi->zbin_over_quant */
+ if (cpi->mb.zbin_over_quant > 0)
+ {
+ int Z = cpi->mb.zbin_over_quant;
+ double Factor = 0.99;
+ double factor_adjustment = 0.01 / 256.0;
+
+ while (Z > 0)
+ {
+ Z --;
+ projected_size_based_on_q =
+ (int)(Factor * projected_size_based_on_q);
+ Factor += factor_adjustment;
+
+ if (Factor >= 0.999)
+ Factor = 0.999;
+ }
+ }
+
+ /* Work out a size correction factor. */
+ if (projected_size_based_on_q > 0)
+ correction_factor = (100 * cpi->projected_frame_size) / projected_size_based_on_q;
+
+ /* More heavily damped adjustment used if we have been oscillating
+ * either side of target
+ */
+ switch (damp_var)
+ {
+ case 0:
+ adjustment_limit = 0.75;
+ break;
+ case 1:
+ adjustment_limit = 0.375;
+ break;
+ case 2:
+ default:
+ adjustment_limit = 0.25;
+ break;
+ }
+
+ if (correction_factor > 102)
+ {
+ /* We are not already at the worst allowable quality */
+ correction_factor = (int)(100.5 + ((correction_factor - 100) * adjustment_limit));
+ rate_correction_factor = ((rate_correction_factor * correction_factor) / 100);
+
+ /* Keep rate_correction_factor within limits */
+ if (rate_correction_factor > MAX_BPB_FACTOR)
+ rate_correction_factor = MAX_BPB_FACTOR;
+ }
+ else if (correction_factor < 99)
+ {
+ /* We are not already at the best allowable quality */
+ correction_factor = (int)(100.5 - ((100 - correction_factor) * adjustment_limit));
+ rate_correction_factor = ((rate_correction_factor * correction_factor) / 100);
+
+ /* Keep rate_correction_factor within limits */
+ if (rate_correction_factor < MIN_BPB_FACTOR)
+ rate_correction_factor = MIN_BPB_FACTOR;
+ }
+
+ if (cpi->common.frame_type == KEY_FRAME)
+ cpi->key_frame_rate_correction_factor = rate_correction_factor;
+ else
+ {
+ if (cpi->oxcf.number_of_layers == 1 &&
+ (cpi->common.refresh_alt_ref_frame ||
+ cpi->common.refresh_golden_frame))
+ cpi->gf_rate_correction_factor = rate_correction_factor;
+ else
+ cpi->rate_correction_factor = rate_correction_factor;
+ }
+}
+
+
+int vp8_regulate_q(VP8_COMP *cpi, int target_bits_per_frame)
+{
+ int Q = cpi->active_worst_quality;
+
+ if (cpi->force_maxqp == 1) {
+ cpi->active_worst_quality = cpi->worst_quality;
+ return cpi->worst_quality;
+ }
+
+ /* Reset Zbin OQ value */
+ cpi->mb.zbin_over_quant = 0;
+
+ if (cpi->oxcf.fixed_q >= 0)
+ {
+ Q = cpi->oxcf.fixed_q;
+
+ if (cpi->common.frame_type == KEY_FRAME)
+ {
+ Q = cpi->oxcf.key_q;
+ }
+ else if (cpi->oxcf.number_of_layers == 1 &&
+ cpi->common.refresh_alt_ref_frame)
+ {
+ Q = cpi->oxcf.alt_q;
+ }
+ else if (cpi->oxcf.number_of_layers == 1 &&
+ cpi->common.refresh_golden_frame)
+ {
+ Q = cpi->oxcf.gold_q;
+ }
+ }
+ else
+ {
+ int i;
+ int last_error = INT_MAX;
+ int target_bits_per_mb;
+ int bits_per_mb_at_this_q;
+ double correction_factor;
+
+ /* Select the appropriate correction factor based upon type of frame. */
+ if (cpi->common.frame_type == KEY_FRAME)
+ correction_factor = cpi->key_frame_rate_correction_factor;
+ else
+ {
+ if (cpi->oxcf.number_of_layers == 1 &&
+ (cpi->common.refresh_alt_ref_frame ||
+ cpi->common.refresh_golden_frame))
+ correction_factor = cpi->gf_rate_correction_factor;
+ else
+ correction_factor = cpi->rate_correction_factor;
+ }
+
+ /* Calculate required scaling factor based on target frame size and
+ * size of frame produced using previous Q
+ */
+ if (target_bits_per_frame >= (INT_MAX >> BPER_MB_NORMBITS))
+ /* Case where we would overflow int */
+ target_bits_per_mb = (target_bits_per_frame / cpi->common.MBs) << BPER_MB_NORMBITS;
+ else
+ target_bits_per_mb = (target_bits_per_frame << BPER_MB_NORMBITS) / cpi->common.MBs;
+
+ i = cpi->active_best_quality;
+
+ do
+ {
+ bits_per_mb_at_this_q = (int)(.5 + correction_factor * vp8_bits_per_mb[cpi->common.frame_type][i]);
+
+ if (bits_per_mb_at_this_q <= target_bits_per_mb)
+ {
+ if ((target_bits_per_mb - bits_per_mb_at_this_q) <= last_error)
+ Q = i;
+ else
+ Q = i - 1;
+
+ break;
+ }
+ else
+ last_error = bits_per_mb_at_this_q - target_bits_per_mb;
+ }
+ while (++i <= cpi->active_worst_quality);
+
+
+ /* If we are at MAXQ then enable Q over-run which seeks to claw
+ * back additional bits through things like the RD multiplier
+ * and zero bin size.
+ */
+ if (Q >= MAXQ)
+ {
+ int zbin_oqmax;
+
+ double Factor = 0.99;
+ double factor_adjustment = 0.01 / 256.0;
+
+ if (cpi->common.frame_type == KEY_FRAME)
+ zbin_oqmax = 0;
+ else if (cpi->oxcf.number_of_layers == 1 &&
+ (cpi->common.refresh_alt_ref_frame ||
+ (cpi->common.refresh_golden_frame &&
+ !cpi->source_alt_ref_active)))
+ zbin_oqmax = 16;
+ else
+ zbin_oqmax = ZBIN_OQ_MAX;
+
+ /*{
+ double Factor = (double)target_bits_per_mb/(double)bits_per_mb_at_this_q;
+ double Oq;
+
+ Factor = Factor/1.2683;
+
+ Oq = pow( Factor, (1.0/-0.165) );
+
+ if ( Oq > zbin_oqmax )
+ Oq = zbin_oqmax;
+
+ cpi->zbin_over_quant = (int)Oq;
+ }*/
+
+ /* Each incrment in the zbin is assumed to have a fixed effect
+ * on bitrate. This is not of course true. The effect will be
+ * highly clip dependent and may well have sudden steps. The
+ * idea here is to acheive higher effective quantizers than the
+ * normal maximum by expanding the zero bin and hence
+ * decreasing the number of low magnitude non zero coefficients.
+ */
+ while (cpi->mb.zbin_over_quant < zbin_oqmax)
+ {
+ cpi->mb.zbin_over_quant ++;
+
+ if (cpi->mb.zbin_over_quant > zbin_oqmax)
+ cpi->mb.zbin_over_quant = zbin_oqmax;
+
+ /* Adjust bits_per_mb_at_this_q estimate */
+ bits_per_mb_at_this_q = (int)(Factor * bits_per_mb_at_this_q);
+ Factor += factor_adjustment;
+
+ if (Factor >= 0.999)
+ Factor = 0.999;
+
+ /* Break out if we get down to the target rate */
+ if (bits_per_mb_at_this_q <= target_bits_per_mb)
+ break;
+ }
+
+ }
+ }
+
+ return Q;
+}
+
+
+static int estimate_keyframe_frequency(VP8_COMP *cpi)
+{
+ int i;
+
+ /* Average key frame frequency */
+ int av_key_frame_frequency = 0;
+
+ /* First key frame at start of sequence is a special case. We have no
+ * frequency data.
+ */
+ if (cpi->key_frame_count == 1)
+ {
+ /* Assume a default of 1 kf every 2 seconds, or the max kf interval,
+ * whichever is smaller.
+ */
+ int key_freq = cpi->oxcf.key_freq>0 ? cpi->oxcf.key_freq : 1;
+ av_key_frame_frequency = 1 + (int)cpi->output_framerate * 2;
+
+ if (cpi->oxcf.auto_key && av_key_frame_frequency > key_freq)
+ av_key_frame_frequency = key_freq;
+
+ cpi->prior_key_frame_distance[KEY_FRAME_CONTEXT - 1]
+ = av_key_frame_frequency;
+ }
+ else
+ {
+ unsigned int total_weight = 0;
+ int last_kf_interval =
+ (cpi->frames_since_key > 0) ? cpi->frames_since_key : 1;
+
+ /* reset keyframe context and calculate weighted average of last
+ * KEY_FRAME_CONTEXT keyframes
+ */
+ for (i = 0; i < KEY_FRAME_CONTEXT; i++)
+ {
+ if (i < KEY_FRAME_CONTEXT - 1)
+ cpi->prior_key_frame_distance[i]
+ = cpi->prior_key_frame_distance[i+1];
+ else
+ cpi->prior_key_frame_distance[i] = last_kf_interval;
+
+ av_key_frame_frequency += prior_key_frame_weight[i]
+ * cpi->prior_key_frame_distance[i];
+ total_weight += prior_key_frame_weight[i];
+ }
+
+ av_key_frame_frequency /= total_weight;
+
+ }
+ // TODO (marpan): Given the checks above, |av_key_frame_frequency|
+ // should always be above 0. But for now we keep the sanity check in.
+ if (av_key_frame_frequency == 0)
+ av_key_frame_frequency = 1;
+ return av_key_frame_frequency;
+}
+
+
+void vp8_adjust_key_frame_context(VP8_COMP *cpi)
+{
+ /* Clear down mmx registers to allow floating point in what follows */
+ vp8_clear_system_state();
+
+ /* Do we have any key frame overspend to recover? */
+ /* Two-pass overspend handled elsewhere. */
+ if ((cpi->pass != 2)
+ && (cpi->projected_frame_size > cpi->per_frame_bandwidth))
+ {
+ int overspend;
+
+ /* Update the count of key frame overspend to be recovered in
+ * subsequent frames. A portion of the KF overspend is treated as gf
+ * overspend (and hence recovered more quickly) as the kf is also a
+ * gf. Otherwise the few frames following each kf tend to get more
+ * bits allocated than those following other gfs.
+ */
+ overspend = (cpi->projected_frame_size - cpi->per_frame_bandwidth);
+
+ if (cpi->oxcf.number_of_layers > 1)
+ cpi->kf_overspend_bits += overspend;
+ else
+ {
+ cpi->kf_overspend_bits += overspend * 7 / 8;
+ cpi->gf_overspend_bits += overspend * 1 / 8;
+ }
+
+ /* Work out how much to try and recover per frame. */
+ cpi->kf_bitrate_adjustment = cpi->kf_overspend_bits
+ / estimate_keyframe_frequency(cpi);
+ }
+
+ cpi->frames_since_key = 0;
+ cpi->key_frame_count++;
+}
+
+
+void vp8_compute_frame_size_bounds(VP8_COMP *cpi, int *frame_under_shoot_limit, int *frame_over_shoot_limit)
+{
+ /* Set-up bounds on acceptable frame size: */
+ if (cpi->oxcf.fixed_q >= 0)
+ {
+ /* Fixed Q scenario: frame size never outranges target
+ * (there is no target!)
+ */
+ *frame_under_shoot_limit = 0;
+ *frame_over_shoot_limit = INT_MAX;
+ }
+ else
+ {
+ if (cpi->common.frame_type == KEY_FRAME)
+ {
+ *frame_over_shoot_limit = cpi->this_frame_target * 9 / 8;
+ *frame_under_shoot_limit = cpi->this_frame_target * 7 / 8;
+ }
+ else
+ {
+ if (cpi->oxcf.number_of_layers > 1 ||
+ cpi->common.refresh_alt_ref_frame ||
+ cpi->common.refresh_golden_frame)
+ {
+ *frame_over_shoot_limit = cpi->this_frame_target * 9 / 8;
+ *frame_under_shoot_limit = cpi->this_frame_target * 7 / 8;
+ }
+ else
+ {
+ /* For CBR take buffer fullness into account */
+ if (cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER)
+ {
+ if (cpi->buffer_level >= ((cpi->oxcf.optimal_buffer_level + cpi->oxcf.maximum_buffer_size) >> 1))
+ {
+ /* Buffer is too full so relax overshoot and tighten
+ * undershoot
+ */
+ *frame_over_shoot_limit = cpi->this_frame_target * 12 / 8;
+ *frame_under_shoot_limit = cpi->this_frame_target * 6 / 8;
+ }
+ else if (cpi->buffer_level <= (cpi->oxcf.optimal_buffer_level >> 1))
+ {
+ /* Buffer is too low so relax undershoot and tighten
+ * overshoot
+ */
+ *frame_over_shoot_limit = cpi->this_frame_target * 10 / 8;
+ *frame_under_shoot_limit = cpi->this_frame_target * 4 / 8;
+ }
+ else
+ {
+ *frame_over_shoot_limit = cpi->this_frame_target * 11 / 8;
+ *frame_under_shoot_limit = cpi->this_frame_target * 5 / 8;
+ }
+ }
+ /* VBR and CQ mode */
+ /* Note that tighter restrictions here can help quality
+ * but hurt encode speed
+ */
+ else
+ {
+ /* Stron overshoot limit for constrained quality */
+ if (cpi->oxcf.end_usage == USAGE_CONSTRAINED_QUALITY)
+ {
+ *frame_over_shoot_limit = cpi->this_frame_target * 11 / 8;
+ *frame_under_shoot_limit = cpi->this_frame_target * 2 / 8;
+ }
+ else
+ {
+ *frame_over_shoot_limit = cpi->this_frame_target * 11 / 8;
+ *frame_under_shoot_limit = cpi->this_frame_target * 5 / 8;
+ }
+ }
+ }
+ }
+
+ /* For very small rate targets where the fractional adjustment
+ * (eg * 7/8) may be tiny make sure there is at least a minimum
+ * range.
+ */
+ *frame_over_shoot_limit += 200;
+ *frame_under_shoot_limit -= 200;
+ if ( *frame_under_shoot_limit < 0 )
+ *frame_under_shoot_limit = 0;
+
+ }
+}
+
+
+/* return of 0 means drop frame */
+int vp8_pick_frame_size(VP8_COMP *cpi)
+{
+ VP8_COMMON *cm = &cpi->common;
+
+ if (cm->frame_type == KEY_FRAME)
+ calc_iframe_target_size(cpi);
+ else
+ {
+ calc_pframe_target_size(cpi);
+
+ /* Check if we're dropping the frame: */
+ if (cpi->drop_frame)
+ {
+ cpi->drop_frame = 0;
+ return 0;
+ }
+ }
+ return 1;
+}
+// If this just encoded frame (mcomp/transform/quant, but before loopfilter and
+// pack_bitstream) has large overshoot, and was not being encoded close to the
+// max QP, then drop this frame and force next frame to be encoded at max QP.
+// Condition this on 1 pass CBR with screen content mode and frame dropper off.
+// TODO(marpan): Should do this exit condition during the encode_frame
+// (i.e., halfway during the encoding of the frame) to save cycles.
+int vp8_drop_encodedframe_overshoot(VP8_COMP *cpi, int Q) {
+ if (cpi->pass == 0 &&
+ cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER &&
+ cpi->drop_frames_allowed == 0 &&
+ cpi->common.frame_type != KEY_FRAME) {
+ // Note: the "projected_frame_size" from encode_frame() only gives estimate
+ // of mode/motion vector rate (in non-rd mode): so below we only require
+ // that projected_frame_size is somewhat greater than per-frame-bandwidth,
+ // but add additional condition with high threshold on prediction residual.
+
+ // QP threshold: only allow dropping if we are not close to qp_max.
+ int thresh_qp = 3 * cpi->worst_quality >> 2;
+ // Rate threshold, in bytes.
+ int thresh_rate = 2 * (cpi->av_per_frame_bandwidth >> 3);
+ // Threshold for the average (over all macroblocks) of the pixel-sum
+ // residual error over 16x16 block. Should add QP dependence on threshold?
+ int thresh_pred_err_mb = (256 << 4);
+ int pred_err_mb = (int)(cpi->mb.prediction_error / cpi->common.MBs);
+ if (Q < thresh_qp &&
+ cpi->projected_frame_size > thresh_rate &&
+ pred_err_mb > thresh_pred_err_mb) {
+ // Drop this frame: advance frame counters, and set force_maxqp flag.
+ cpi->common.current_video_frame++;
+ cpi->frames_since_key++;
+ // Flag to indicate we will force next frame to be encoded at max QP.
+ cpi->force_maxqp = 1;
+ return 1;
+ } else {
+ cpi->force_maxqp = 0;
+ return 0;
+ }
+ return 0;
+ }
+ return 0;
+}
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