Commit e9613170 authored by John Koleszar's avatar John Koleszar
Browse files

Revert "Improved 1-pass CBR rate control"

This reverts commit b5ea2fbc. Further
testing showed noticable keyframe popping in some cases, reverting this
for now to give time for a proper fix.

Conflicts:

	vp8/encoder/onyx_if.c
	vp8/encoder/ratectrl.c

Change-Id: I159f53d1bf0e24c035754ab3ded8ccfd58fd04af
parent a4c2211e
......@@ -18,7 +18,6 @@
extern "C"
{
#endif
#include "vpx/vpx_codec.h"
#include "type_aliases.h"
#include "vpx_scale/yv12config.h"
#include "ppflags.h"
......
......@@ -357,58 +357,33 @@ static int frame_max_bits(VP8_COMP *cpi)
int max_bits;
// For CBR we need to also consider buffer fullness.
// If we are running below the optimal level then we need to gradually tighten up on max_bits.
if (cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER)
{
max_bits = 2 * cpi->av_per_frame_bandwidth;
max_bits -= cpi->buffered_av_per_frame_bandwidth;
max_bits *= ((double)cpi->oxcf.two_pass_vbrmax_section / 100.0);
}
// VBR
else
{
// For VBR base this on the bits and frames left plus the two_pass_vbrmax_section rate passed in by the user
max_bits = (int)(((double)cpi->twopass.bits_left / (cpi->twopass.total_stats->count - (double)cpi->common.current_video_frame)) * ((double)cpi->oxcf.two_pass_vbrmax_section / 100.0));
}
// Trap case where we are out of bits
if (max_bits < 0)
max_bits = 0;
double buffer_fullness_ratio = (double)cpi->buffer_level / DOUBLE_DIVIDE_CHECK((double)cpi->oxcf.optimal_buffer_level);
return max_bits;
}
// For CBR base this on the target average bits per frame plus the maximum sedction rate passed in by the user
max_bits = (int)(cpi->av_per_frame_bandwidth * ((double)cpi->oxcf.two_pass_vbrmax_section / 100.0));
// If our buffer is below the optimum level
if (buffer_fullness_ratio < 1.0)
{
// The lower of max_bits / 4 or cpi->av_per_frame_bandwidth / 4.
int min_max_bits = ((cpi->av_per_frame_bandwidth >> 2) < (max_bits >> 2)) ? cpi->av_per_frame_bandwidth >> 2 : max_bits >> 2;
static int gf_group_max_bits(VP8_COMP *cpi)
{
// Max allocation for a golden frame group
int max_bits;
max_bits = (int)(max_bits * buffer_fullness_ratio);
// For CBR we need to also consider buffer fullness.
if (cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER)
{
max_bits = cpi->av_per_frame_bandwidth * cpi->baseline_gf_interval;
if (max_bits > cpi->oxcf.optimal_buffer_level)
{
max_bits -= cpi->oxcf.optimal_buffer_level;
max_bits += cpi->buffer_level;
if (max_bits < min_max_bits)
max_bits = min_max_bits; // Lowest value we will set ... which should allow the buffer to refil.
}
else
{
max_bits -= (cpi->buffered_av_per_frame_bandwidth
- cpi->av_per_frame_bandwidth)
* cpi->baseline_gf_interval;
}
max_bits *= ((double)cpi->oxcf.two_pass_vbrmax_section / 100.0);
}
// VBR
else
{
// For VBR base this on the bits and frames left plus the two_pass_vbrmax_section rate passed in by the user
max_bits = (int)(((double)cpi->twopass.bits_left / (cpi->twopass.total_stats->count - (double)cpi->common.current_video_frame)) * ((double)cpi->oxcf.two_pass_vbrmax_section / 100.0));
max_bits *= cpi->baseline_gf_interval;
}
// Trap case where we are out of bits
if (max_bits < 0)
max_bits = 0;
......@@ -1626,7 +1601,7 @@ static void define_gf_group(VP8_COMP *cpi, FIRSTPASS_STATS *this_frame)
double abs_mv_in_out_accumulator = 0.0;
double mod_err_per_mb_accumulator = 0.0;
int max_group_bits;
int max_bits = frame_max_bits(cpi); // Max for a single frame
unsigned int allow_alt_ref =
cpi->oxcf.play_alternate && cpi->oxcf.lag_in_frames;
......@@ -1988,9 +1963,8 @@ static void define_gf_group(VP8_COMP *cpi, FIRSTPASS_STATS *this_frame)
// Clip cpi->twopass.gf_group_bits based on user supplied data rate
// variability limit (cpi->oxcf.two_pass_vbrmax_section)
max_group_bits = gf_group_max_bits(cpi);
if (cpi->twopass.gf_group_bits > max_group_bits)
cpi->twopass.gf_group_bits = max_group_bits;
if (cpi->twopass.gf_group_bits > max_bits * cpi->baseline_gf_interval)
cpi->twopass.gf_group_bits = max_bits * cpi->baseline_gf_interval;
// Reset the file position
reset_fpf_position(cpi, start_pos);
......@@ -2090,6 +2064,13 @@ static void define_gf_group(VP8_COMP *cpi, FIRSTPASS_STATS *this_frame)
}
}
// Apply an additional limit for CBR
if (cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER)
{
if (cpi->twopass.gf_bits > (cpi->buffer_level >> 1))
cpi->twopass.gf_bits = cpi->buffer_level >> 1;
}
// Dont allow a negative value for gf_bits
if (gf_bits < 0)
gf_bits = 0;
......
......@@ -1460,7 +1460,6 @@ static void init_config(VP8_PTR ptr, VP8_CONFIG *oxcf)
cpi->rolling_actual_bits = cpi->av_per_frame_bandwidth;
cpi->long_rolling_target_bits = cpi->av_per_frame_bandwidth;
cpi->long_rolling_actual_bits = cpi->av_per_frame_bandwidth;
cpi->buffered_av_per_frame_bandwidth = cpi->av_per_frame_bandwidth;
cpi->total_actual_bits = 0;
cpi->total_target_vs_actual = 0;
......@@ -1556,7 +1555,7 @@ void vp8_change_config(VP8_PTR ptr, VP8_CONFIG *oxcf)
break;
}
if (cpi->pass == 0 && cpi->oxcf.end_usage != USAGE_STREAM_FROM_SERVER)
if (cpi->pass == 0)
cpi->auto_worst_q = 1;
cpi->oxcf.worst_allowed_q = q_trans[oxcf->worst_allowed_q];
......@@ -3198,116 +3197,6 @@ void loopfilter_frame(VP8_COMP *cpi, VP8_COMMON *cm)
}
static void update_buffer_level(VP8_COMP *cpi)
{
int64_t tmp;
/* Update the buffered average bitrate.
*
* The buffered average bitrate tracks the bitrate over the buffer
* window. Here we simulate taking a frame of average size out
* of the buffer, and putting in the new frame just encoded.
* It is calculated accordingly:
*
* A = Average Bits Per Frame In The Buffer
* P = New Frame Size
* N = Number of bits in the buffer
*
* We recalculate the average as so:
* (N-A)*A + A*P A * (N - A + P)
* A' = ------------- = ---------------
* N N
*
* This is modeled after a the standard algorithm for a moving
* average with fixed weighting (eg A' = ((N-1)*A + 1*P) / N). This makes
* the step response nonlinear but consistent with expected behavior --
* when A is large, the model adapts more quickly, since there are
* fewer frames in the buffer and conversely when A is small there
* will be more frames in the buffer so the average will adapt
* slowly.
*
* TODO(jkoleszar): This may give poor step response in some situations,
* for example motion following a long static section. It might be
* worth experimenting more with weighting by av_per_frame_bandwidth
* rather than buffered_av_per_frame_bandwidth or using a more accurate
* algorithm to get faster response. Current testing showed worse results
* with that setting though.
*
*/
/* Guard against buffered_av_per_frame_bandwidth falling to 0. Should
* never happen, but without this check, it would be irrecoverable.
*/
if(cpi->buffered_av_per_frame_bandwidth == 0)
cpi->buffered_av_per_frame_bandwidth = 1;
tmp = cpi->oxcf.maximum_buffer_size
- cpi->buffered_av_per_frame_bandwidth
+ cpi->projected_frame_size;
tmp *= cpi->buffered_av_per_frame_bandwidth;
cpi->buffered_av_per_frame_bandwidth = tmp
/ cpi->oxcf.maximum_buffer_size;
if(cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER)
{
/* In CBR mode, buffer level is synthesized from the buffered
* average per-frame bandwidth to get the response characteristics
* of that model, rather than using the unbounded (wrt buffer size)
* bits_off_target. ie, the long term average bitrate doesn't
* matter in CBR mode. If the clip is consistently undershooting
* because it is very static, for example, you don't want to blow
* your short term bitrate budget trying to the the long term spend
* up to the target when you hit a motion section.
*
* Instead, the ratio of buffered_av_per_frame_bandwidth to the
* target av_per_frame_bandwidth is taken, scaled by
* maximum_buffer_size and centered around optimal_buffer_level,
* which presents the expected behavior of buffer_level for the other
* parts of the rate control code which handle the targeting.
*
* Note that this only happens after the starting_buffer_level
* has passed, to give the model a chance to stabilize.
*/
if(cpi->total_actual_bits > cpi->oxcf.starting_buffer_level)
{
tmp = (int64_t)cpi->buffered_av_per_frame_bandwidth
* cpi->oxcf.maximum_buffer_size
/ cpi->av_per_frame_bandwidth;
cpi->buffer_level = cpi->oxcf.maximum_buffer_size
- tmp
+ cpi->oxcf.optimal_buffer_level;
}
else
cpi->buffer_level = cpi->oxcf.optimal_buffer_level;
/* Accumulate recent overshoot error.
*
* If this frame is larger than the target, then accumulate
* that error to apply as a damping factor later. Only care about
* recent overshoot, so this value decays by (N-P)/N
*/
if(cpi->total_actual_bits > cpi->oxcf.starting_buffer_level)
{
int64_t decayed_overshoot;
decayed_overshoot = cpi->accumulated_overshoot;
decayed_overshoot *= (cpi->oxcf.maximum_buffer_size
- cpi->projected_frame_size);
decayed_overshoot /= cpi->oxcf.maximum_buffer_size;
cpi->accumulated_overshoot = decayed_overshoot;
cpi->accumulated_overshoot +=
(cpi->projected_frame_size > cpi->av_per_frame_bandwidth)
? cpi->projected_frame_size - cpi->av_per_frame_bandwidth
: 0;
}
}
else
cpi->buffer_level = cpi->bits_off_target;
}
static void encode_frame_to_data_rate
(
VP8_COMP *cpi,
......@@ -3553,8 +3442,7 @@ static void encode_frame_to_data_rate
// For CBR if the buffer reaches its maximum level then we can no longer
// save up bits for later frames so we might as well use them up
// on the current frame.
if (cpi->pass == 2
&& (cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER) &&
if ((cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER) &&
(cpi->buffer_level >= cpi->oxcf.optimal_buffer_level) && cpi->buffered_mode)
{
int Adjustment = cpi->active_worst_quality / 4; // Max adjustment is 1/4
......@@ -3645,10 +3533,6 @@ static void encode_frame_to_data_rate
}
else
{
if(cpi->pass != 2)
Q = cpi->auto_worst_q?
cpi->active_worst_quality:cpi->avg_frame_qindex;
cpi->active_best_quality = inter_minq[Q];
// For the constant/constrained quality mode we dont want
......@@ -3950,17 +3834,15 @@ static void encode_frame_to_data_rate
(cpi->active_worst_quality < cpi->worst_quality) &&
(cpi->projected_frame_size > frame_over_shoot_limit))
{
/* step down active_worst_quality such that the corresponding
* active_best_quality will be equal to the current
* active_worst_quality + 1. Once the limit on active_best_quality
* is reached, active_worst_quality will equal worst_quality.
*/
int i;
int over_size_percent = ((cpi->projected_frame_size - frame_over_shoot_limit) * 100) / frame_over_shoot_limit;
for(i=cpi->active_worst_quality; i<cpi->worst_quality; i++)
if(inter_minq[i] >= cpi->active_worst_quality + 1)
break;
cpi->active_worst_quality = i;
// If so is there any scope for relaxing it
while ((cpi->active_worst_quality < cpi->worst_quality) && (over_size_percent > 0))
{
cpi->active_worst_quality++;
top_index = cpi->active_worst_quality;
over_size_percent = (int)(over_size_percent * 0.96); // Assume 1 qstep = about 4% on frame size.
}
// If we have updated the active max Q do not call vp8_update_rate_correction_factors() this loop.
active_worst_qchanged = TRUE;
......@@ -4348,9 +4230,10 @@ static void encode_frame_to_data_rate
// Update the buffer level variable.
// Non-viewable frames are a special case and are treated as pure overhead.
if ( cm->show_frame )
cpi->bits_off_target += cpi->av_per_frame_bandwidth;
cpi->bits_off_target -= cpi->projected_frame_size;
if ( !cm->show_frame )
cpi->bits_off_target -= cpi->projected_frame_size;
else
cpi->bits_off_target += cpi->av_per_frame_bandwidth - cpi->projected_frame_size;
// Rolling monitors of whether we are over or underspending used to help regulate min and Max Q in two pass.
cpi->rolling_target_bits = ((cpi->rolling_target_bits * 3) + cpi->this_frame_target + 2) / 4;
......@@ -4364,7 +4247,7 @@ static void encode_frame_to_data_rate
// Debug stats
cpi->total_target_vs_actual += (cpi->this_frame_target - cpi->projected_frame_size);
update_buffer_level(cpi);
cpi->buffer_level = cpi->bits_off_target;
// Update bits left to the kf and gf groups to account for overshoot or undershoot on these frames
if (cm->frame_type == KEY_FRAME)
......
......@@ -348,10 +348,6 @@ typedef struct VP8_COMP
int per_frame_bandwidth; // Current section per frame bandwidth target
int av_per_frame_bandwidth; // Average frame size target for clip
int min_frame_bandwidth; // Minimum allocation that should be used for any frame
int buffered_av_per_frame_bandwidth; // Average bitrate over the last buffer
int buffered_av_per_frame_bandwidth_rem; // Average bitrate remainder
int accumulated_overshoot; // Accumulated # of bits spent > target
int inter_frame_target;
double output_frame_rate;
int64_t last_time_stamp_seen;
......
......@@ -608,7 +608,7 @@ static void calc_pframe_target_size(VP8_COMP *cpi)
int min_frame_target;
int Adjustment;
min_frame_target = 1;
min_frame_target = 0;
if (cpi->pass == 2)
{
......@@ -617,11 +617,9 @@ static void calc_pframe_target_size(VP8_COMP *cpi)
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;
}
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)
......@@ -1114,33 +1112,6 @@ static void calc_pframe_target_size(VP8_COMP *cpi)
}
}
if (cpi->pass==0
&& cpi->common.refresh_golden_frame
&& cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER) {
int64_t adjust;
/*
frames_in_buffer = cpi->oxcf.maximum_buffer_size
/ cpi->av_per_frame_bandwidth;
gf_in_buffer = frames_in_buffer /
cpi->frames_till_gf_update_due;
overshoot_per_gf = cpi->accumulated_overshoot / gf_in_buffer;
*/
adjust = cpi->accumulated_overshoot;
adjust *= cpi->frames_till_gf_update_due + 1;
adjust *= cpi->av_per_frame_bandwidth;
adjust /= cpi->oxcf.maximum_buffer_size;
if (adjust > (cpi->this_frame_target - min_frame_target))
adjust = (cpi->this_frame_target - min_frame_target);
else if (adjust < 0)
adjust = 0;
cpi->this_frame_target -= adjust;
}
}
......
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