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Merge "Reduce overshoot in 1 pass rate control"

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This commit is contained in:
John Koleszar 2011-06-07 12:30:37 -07:00 committed by Code Review
commit 5c166470a5
4 changed files with 136 additions and 47 deletions
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73
vp8/encoder/firstpass.c
View File

@ -243,25 +243,11 @@ 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)
{
double buffer_fullness_ratio = (double)cpi->buffer_level / DOUBLE_DIVIDE_CHECK((double)cpi->oxcf.optimal_buffer_level);
// 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;
max_bits = (int)(max_bits * buffer_fullness_ratio);
if (max_bits < min_max_bits)
max_bits = min_max_bits; // Lowest value we will set ... which should allow the buffer to refil.
}
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
@ -278,6 +264,45 @@ static int frame_max_bits(VP8_COMP *cpi)
}
static int gf_group_max_bits(VP8_COMP *cpi)
{
// Max allocation for a golden frame group
int max_bits;
// 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;
}
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);
}
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;
return max_bits;
}
static void output_stats(const VP8_COMP *cpi,
struct vpx_codec_pkt_list *pktlist,
FIRSTPASS_STATS *stats)
@ -1362,7 +1387,7 @@ 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_bits = frame_max_bits(cpi); // Max for a single frame
int max_group_bits;
unsigned int allow_alt_ref =
cpi->oxcf.play_alternate && cpi->oxcf.lag_in_frames;
@ -1715,8 +1740,9 @@ static void define_gf_group(VP8_COMP *cpi, FIRSTPASS_STATS *this_frame)
cpi->twopass.gf_group_bits = (cpi->twopass.gf_group_bits < 0) ? 0 : (cpi->twopass.gf_group_bits > cpi->twopass.kf_group_bits) ? cpi->twopass.kf_group_bits : cpi->twopass.gf_group_bits;
// Clip cpi->twopass.gf_group_bits based on user supplied data rate variability limit (cpi->oxcf.two_pass_vbrmax_section)
if (cpi->twopass.gf_group_bits > max_bits * cpi->baseline_gf_interval)
cpi->twopass.gf_group_bits = max_bits * cpi->baseline_gf_interval;
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;
// Reset the file position
reset_fpf_position(cpi, start_pos);
@ -1810,13 +1836,6 @@ 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 (cpi->twopass.gf_bits < 0)
cpi->twopass.gf_bits = 0;

61
vp8/encoder/onyx_if.c
View File

@ -1477,6 +1477,7 @@ 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;
@ -1572,7 +1573,7 @@ void vp8_change_config(VP8_PTR ptr, VP8_CONFIG *oxcf)
break;
}
if (cpi->pass == 0)
if (cpi->pass == 0 && cpi->oxcf.end_usage != USAGE_STREAM_FROM_SERVER)
cpi->auto_worst_q = 1;
cpi->oxcf.worst_allowed_q = q_trans[oxcf->worst_allowed_q];
@ -3453,7 +3454,8 @@ 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->oxcf.end_usage == USAGE_STREAM_FROM_SERVER) &&
if (cpi->pass == 2
&& (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
@ -3544,6 +3546,9 @@ static void encode_frame_to_data_rate
}
else
{
if(cpi->pass != 2)
Q = cpi->avg_frame_qindex;
cpi->active_best_quality = inter_minq[Q];
// For the constant/constrained quality mode we dont want
@ -3845,15 +3850,16 @@ static void encode_frame_to_data_rate
(cpi->active_worst_quality < cpi->worst_quality) &&
(cpi->projected_frame_size > frame_over_shoot_limit))
{
int over_size_percent = ((cpi->projected_frame_size - frame_over_shoot_limit) * 100) / 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
*/
int 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.
}
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 we have updated the active max Q do not call vp8_update_rate_correction_factors() this loop.
active_worst_qchanged = TRUE;
@ -4241,10 +4247,9 @@ 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->projected_frame_size;
else
cpi->bits_off_target += cpi->av_per_frame_bandwidth - cpi->projected_frame_size;
if ( cm->show_frame )
cpi->bits_off_target += cpi->av_per_frame_bandwidth;
cpi->bits_off_target -= 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;
@ -4258,7 +4263,33 @@ static void encode_frame_to_data_rate
// Debug stats
cpi->total_target_vs_actual += (cpi->this_frame_target - cpi->projected_frame_size);
cpi->buffer_level = cpi->bits_off_target;
// Update the buffered average bitrate
{
long long numerator;
numerator = cpi->oxcf.maximum_buffer_size
- cpi->buffered_av_per_frame_bandwidth
+ cpi->projected_frame_size;
numerator *= cpi->buffered_av_per_frame_bandwidth;
cpi->buffered_av_per_frame_bandwidth = numerator
/ cpi->oxcf.maximum_buffer_size;
}
{
long long tmp = (long long)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;
}
// Accumulate overshoot error.
cpi->accumulated_overshoot +=
(cpi->projected_frame_size > cpi->av_per_frame_bandwidth)
? cpi->projected_frame_size - cpi->av_per_frame_bandwidth
: 0;
// Update bits left to the kf and gf groups to account for overshoot or undershoot on these frames
if (cm->frame_type == KEY_FRAME)

4
vp8/encoder/onyx_int.h
View File

@ -351,6 +351,10 @@ 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;
long long last_time_stamp_seen;

45
vp8/encoder/ratectrl.c
View File

@ -605,10 +605,10 @@ static void calc_gf_params(VP8_COMP *cpi)
static void calc_pframe_target_size(VP8_COMP *cpi)
{
int min_frame_target;
int min_frame_target, max_frame_target;
int Adjustment;
min_frame_target = 0;
min_frame_target = 1;
if (cpi->pass == 2)
{
@ -616,10 +616,19 @@ 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;
max_frame_target = INT_MAX;
}
else
{
if (min_frame_target < cpi->per_frame_bandwidth / 4)
min_frame_target = cpi->per_frame_bandwidth / 4;
/* Don't allow the target to completely deplete the buffer. */
max_frame_target = cpi->buffer_level + cpi->av_per_frame_bandwidth;
if(max_frame_target < min_frame_target)
max_frame_target = min_frame_target;
}
// Special alt reference frame case
if (cpi->common.refresh_alt_ref_frame)
@ -1112,6 +1121,32 @@ static void calc_pframe_target_size(VP8_COMP *cpi)
}
}
if (cpi->pass==0 && cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER){
/* determine the accumulated error to apply to this frame. Apply
* more of the error when we've been undershooting, less when
* we've been overshooting
*/
long long adjust;
int bitrate_error;
bitrate_error = cpi->av_per_frame_bandwidth
- cpi->buffered_av_per_frame_bandwidth;
adjust = cpi->accumulated_overshoot;
adjust *= cpi->av_per_frame_bandwidth + bitrate_error;
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;
cpi->accumulated_overshoot -= adjust;
}
if(cpi->this_frame_target > max_frame_target)
cpi->this_frame_target = max_frame_target;
}