ref: cfbfd39de8da61644ff0fd3a149d3a8957c28b1d
parent: ef86bad0d1bad5bfc68b80783d56a3a476002924
parent: c99f9d7abf90538bc569a5683299766276b287c9
author: John Koleszar <jkoleszar@google.com>
date: Mon Apr 25 06:49:32 EDT 2011
Merge "Change rc undershoot/overshoot semantics"
--- a/vp8/common/onyx.h
+++ b/vp8/common/onyx.h
@@ -140,8 +140,9 @@
int end_usage; // vbr or cbr
- // shoot to keep buffer full at all times by undershooting a bit 95 recommended
+ // buffer targeting aggressiveness
int under_shoot_pct;
+ int over_shoot_pct;
// buffering parameters
int starting_buffer_level; // in seconds
--- a/vp8/encoder/ratectrl.c
+++ b/vp8/encoder/ratectrl.c
@@ -817,11 +817,6 @@
}
}
- // Set a reduced data rate target for our initial Q calculation.
- // This should help to save bits during earier sections.
- if ((cpi->oxcf.under_shoot_pct > 0) && (cpi->oxcf.under_shoot_pct <= 100))
- cpi->this_frame_target = (cpi->this_frame_target * cpi->oxcf.under_shoot_pct) / 100;
-
// 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
@@ -858,11 +853,6 @@
percent_low =
(cpi->oxcf.optimal_buffer_level - cpi->buffer_level) /
one_percent_bits;
-
- if (percent_low > 100)
- percent_low = 100;
- else if (percent_low < 0)
- percent_low = 0;
}
// Are we overshooting the long term clip data rate...
else if (cpi->bits_off_target < 0)
@@ -870,16 +860,16 @@
// Adjust per frame data target downwards to compensate.
percent_low = (int)(100 * -cpi->bits_off_target /
(cpi->total_byte_count * 8));
-
- if (percent_low > 100)
- percent_low = 100;
- else if (percent_low < 0)
- percent_low = 0;
}
+ 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 * (100 - (percent_low / 2))) / 100;
+ 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.
@@ -950,20 +940,29 @@
}
else
{- int percent_high;
+ int percent_high = 0;
- if (cpi->bits_off_target > cpi->oxcf.optimal_buffer_level)
+ if ((cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER)
+ && (cpi->buffer_level > cpi->oxcf.optimal_buffer_level))
{- percent_high = (int)(100 * (cpi->bits_off_target - cpi->oxcf.optimal_buffer_level) / (cpi->total_byte_count * 8));
+ percent_high = (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 > 100)
- percent_high = 100;
- else if (percent_high < 0)
- percent_high = 0;
+ 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 * (100 + (percent_high / 2))) / 100;
+ cpi->this_frame_target += (cpi->this_frame_target *
+ percent_high) / 200;
- }
// Are we allowing control of active_worst_allowed_q according to bufferl level.
if (cpi->auto_worst_q)
@@ -1538,7 +1537,7 @@
cpi->key_frame_count++;
}
-
+void vp8_compute_frame_size_bounds(VP8_COMP *cpi, int *frame_under_shoot_limit, int *frame_over_shoot_limit)
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:
--- a/vp8/vp8_cx_iface.c
+++ b/vp8/vp8_cx_iface.c
@@ -151,7 +151,8 @@
RANGE_CHECK_HI(cfg, g_lag_in_frames, 0);
#endif
RANGE_CHECK(cfg, rc_end_usage, VPX_VBR, VPX_CQ);
- RANGE_CHECK_HI(cfg, rc_undershoot_pct, 100);
+ RANGE_CHECK_HI(cfg, rc_undershoot_pct, 1000);
+ RANGE_CHECK_HI(cfg, rc_overshoot_pct, 1000);
RANGE_CHECK_HI(cfg, rc_2pass_vbr_bias_pct, 100);
RANGE_CHECK(cfg, kf_mode, VPX_KF_DISABLED, VPX_KF_AUTO);
//RANGE_CHECK_BOOL(cfg, g_delete_firstpassfile);
@@ -312,7 +313,7 @@
oxcf->fixed_q = -1;
oxcf->under_shoot_pct = cfg.rc_undershoot_pct;
- //oxcf->over_shoot_pct = cfg.rc_overshoot_pct;
+ oxcf->over_shoot_pct = cfg.rc_overshoot_pct;
oxcf->maximum_buffer_size = cfg.rc_buf_sz;
oxcf->starting_buffer_level = cfg.rc_buf_initial_sz;
@@ -358,6 +359,7 @@
printf("key_freq: %d\n", oxcf->key_freq); printf("end_usage: %d\n", oxcf->end_usage); printf("under_shoot_pct: %d\n", oxcf->under_shoot_pct);+ printf("over_shoot_pct: %d\n", oxcf->over_shoot_pct); printf("starting_buffer_level: %d\n", oxcf->starting_buffer_level); printf("optimal_buffer_level: %d\n", oxcf->optimal_buffer_level); printf("maximum_buffer_size: %d\n", oxcf->maximum_buffer_size);@@ -1087,8 +1089,8 @@
0, /* rc_max_intra_bitrate_pct */
4, /* rc_min_quantizer */
63, /* rc_max_quantizer */
- 95, /* rc_undershoot_pct */
- 200, /* rc_overshoot_pct */
+ 100, /* rc_undershoot_pct */
+ 100, /* rc_overshoot_pct */
6000, /* rc_max_buffer_size */
4000, /* rc_buffer_initial_size; */
--- a/vpx/vpx_encoder.h
+++ b/vpx/vpx_encoder.h
@@ -445,20 +445,28 @@
*/
- /*!\brief Rate control undershoot tolerance
+ /*!\brief Rate control adaptation undershoot control
*
- * This value, expressed as a percentage of the target bitrate, describes
- * the target bitrate for easier frames, allowing bits to be saved for
- * harder frames. Set to zero to use the codec default.
+ * This value, expressed as a percentage of the target bitrate,
+ * controls the maximum allowed adaptation speed of the codec.
+ * This factor controls the maximum amount of bits that can
+ * be subtracted from the target bitrate in order to compensate
+ * for prior overshoot.
+ *
+ * Valid values in the range 0-1000.
*/
unsigned int rc_undershoot_pct;
- /*!\brief Rate control overshoot tolerance
+ /*!\brief Rate control adaptation overshoot control
*
- * This value, expressed as a percentage of the target bitrate, describes
- * the maximum allowed bitrate for a given frame. Set to zero to use the
- * codec default.
+ * This value, expressed as a percentage of the target bitrate,
+ * controls the maximum allowed adaptation speed of the codec.
+ * This factor controls the maximum amount of bits that can
+ * be added to the target bitrate in order to compensate for
+ * prior undershoot.
+ *
+ * Valid values in the range 0-1000.
*/
unsigned int rc_overshoot_pct;
--
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