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Refactor calc_iframe_target_size

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Combine calc_iframe_target_size, previously only used for forced
keyframes, with calc_auto_iframe_target_size, which handled most
keyframes.

Change-Id: I227051361cf46727caa5cd2b155752d2c9789364
This commit is contained in:
John Koleszar 2011-04-26 16:45:30 -04:00
parent 81d2206ff8
commit db5057c742
3 changed files with 61 additions and 188 deletions
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3
vp8/encoder/onyx_if.c
View File

@ -1441,10 +1441,7 @@ static void init_config(VP8_PTR ptr, VP8_CONFIG *oxcf)
cpi->auto_gold = 1;
cpi->auto_adjust_gold_quantizer = 1;
cpi->goldquantizer = 1;
cpi->goldfreq = 7;
cpi->auto_adjust_key_quantizer = 1;
cpi->keyquantizer = 1;
cm->version = oxcf->Version;
vp8_setup_version(cm);

3
vp8/encoder/onyx_int.h
View File

@ -501,10 +501,7 @@ typedef struct
int interquantizer;
int auto_gold;
int auto_adjust_gold_quantizer;
int goldquantizer;
int goldfreq;
int auto_adjust_key_quantizer;
int keyquantizer;
int auto_worst_q;
int cpu_used;
int chroma_boost;

243
vp8/encoder/ratectrl.c
View File

@ -330,65 +330,95 @@ void vp8_setup_key_frame(VP8_COMP *cpi)
}
static void calc_iframe_target_size(VP8_COMP *cpi);
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_auto_iframe_target_size(VP8_COMP *cpi)
static void calc_iframe_target_size(VP8_COMP *cpi)
{
// boost defaults to half second
int kf_boost;
int target;
// Clear down mmx registers to allow floating point in what follows
vp8_clear_system_state(); //__asm emms;
if (cpi->oxcf.fixed_q >= 0)
{
calc_iframe_target_size(cpi);
return;
}
int Q = cpi->oxcf.key_q;
if (cpi->pass == 2)
target = estimate_bits_at_q(INTRA_FRAME, Q, cpi->common.MBs,
cpi->key_frame_rate_correction_factor);
}
else if (cpi->pass == 2)
{
cpi->this_frame_target = cpi->per_frame_bandwidth; // New Two pass RC
// 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;
// Boost depends somewhat on frame rate
kf_boost = (int)(2 * cpi->output_frame_rate - 16);
// adjustment up based on q
kf_boost = kf_boost * kf_boost_qadjustment[cpi->ni_av_qi] / 100;
kf_boost = kf_boost * kf_boost_qadjustment[Q] / 100;
// frame separation adjustment ( down)
if (cpi->frames_since_key < cpi->output_frame_rate / 2)
kf_boost = (int)(kf_boost * cpi->frames_since_key / (cpi->output_frame_rate / 2));
kf_boost = (int)(kf_boost
* cpi->frames_since_key / (cpi->output_frame_rate / 2));
if (kf_boost < 16)
kf_boost = 16;
// Reset the active worst quality to the baseline value for key frames.
cpi->active_worst_quality = cpi->worst_quality;
cpi->this_frame_target = ((16 + kf_boost) * cpi->per_frame_bandwidth) >> 4;
target = ((16 + kf_boost) * cpi->per_frame_bandwidth) >> 4;
}
// Should the next frame be an altref frame
if (cpi->pass != 2)
if (cpi->oxcf.rc_max_intra_bitrate_pct)
{
// For now Alt ref is not allowed except in 2 pass modes.
cpi->source_alt_ref_pending = FALSE;
unsigned int max_rate = cpi->per_frame_bandwidth
* cpi->oxcf.rc_max_intra_bitrate_pct / 100;
/*if ( cpi->oxcf.fixed_q == -1)
{
if ( cpi->oxcf.play_alternate && ( (cpi->last_boost/2) > (100+(AF_THRESH*cpi->frames_till_gf_update_due)) ) )
cpi->source_alt_ref_pending = TRUE;
else
cpi->source_alt_ref_pending = FALSE;
}*/
if (target > max_rate)
target = max_rate;
}
if (0)
cpi->this_frame_target = target;
// TODO: if we separate rate targeting from Q targetting, move this.
// Reset the active worst quality to the baseline value for key frames.
cpi->active_worst_quality = cpi->worst_quality;
#if 0
{
FILE *f;
@ -401,8 +431,10 @@ static void calc_auto_iframe_target_size(VP8_COMP *cpi)
fclose(f);
}
#endif
}
// Do the best we can to define the parameteres for the next GF based on what information we have available.
static void calc_gf_params(VP8_COMP *cpi)
{
@ -568,97 +600,6 @@ static void calc_gf_params(VP8_COMP *cpi)
}*/
}
}
/* This is equvialent to estimate_bits_at_q without the rate_correction_factor. */
static int baseline_bits_at_q(int frame_kind, int Q, int MBs)
{
int Bpm = 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)
{
int Q;
int Boost = 100;
Q = (cpi->oxcf.fixed_q >= 0) ? cpi->oxcf.fixed_q : cpi->avg_frame_qindex;
if (cpi->auto_adjust_key_quantizer == 1)
{
// If (auto_adjust_key_quantizer==1) then a lower Q is selected for key-frames.
// The enhanced Q is calculated so as to boost the key frame size by a factor
// specified in kf_boost_qadjustment. Also, can adjust based on distance
// between key frames.
// Adjust boost based upon ambient Q
Boost = kf_boost_qadjustment[Q];
// Make the Key frame boost less if the seperation from the previous key frame is small
if (cpi->frames_since_key < 16)
Boost = Boost * kf_boost_seperation_adjustment[cpi->frames_since_key] / 100;
else
Boost = Boost * kf_boost_seperation_adjustment[15] / 100;
// Apply limits on boost
if (Boost > kf_gf_boost_qlimits[Q])
Boost = kf_gf_boost_qlimits[Q];
else if (Boost < 120)
Boost = 120;
}
// Keep a record of the boost that was used
cpi->last_boost = Boost;
// Should the next frame be an altref frame
if (cpi->pass != 2)
{
// For now Alt ref is not allowed except in 2 pass modes.
cpi->source_alt_ref_pending = FALSE;
/*if ( cpi->oxcf.fixed_q == -1)
{
if ( cpi->oxcf.play_alternate && ( (cpi->last_boost/2) > (100+(AF_THRESH*cpi->frames_till_gf_update_due)) ) )
cpi->source_alt_ref_pending = TRUE;
else
cpi->source_alt_ref_pending = FALSE;
}*/
}
if (cpi->oxcf.fixed_q >= 0)
{
cpi->this_frame_target = (baseline_bits_at_q(0, Q, cpi->common.MBs) * Boost) / 100;
}
else
{
int bits_per_mb_at_this_q ;
if (cpi->oxcf.error_resilient_mode == 1)
{
cpi->this_frame_target = 2 * cpi->av_per_frame_bandwidth;
return;
}
// Rate targetted scenario:
// Be careful of 32-bit OVERFLOW if restructuring the caluclation of cpi->this_frame_target
bits_per_mb_at_this_q = (int)(.5 +
cpi->key_frame_rate_correction_factor * vp8_bits_per_mb[0][Q]);
cpi->this_frame_target = (((bits_per_mb_at_this_q * cpi->common.MBs) >> BPER_MB_NORMBITS) * Boost) / 100;
// Reset the active worst quality to the baseline value for key frames.
if (cpi->pass < 2)
cpi->active_worst_quality = cpi->worst_quality;
}
}
static void calc_pframe_target_size(VP8_COMP *cpi)
@ -1153,7 +1094,9 @@ static void calc_pframe_target_size(VP8_COMP *cpi)
}
}
else
cpi->this_frame_target = (baseline_bits_at_q(1, Q, cpi->common.MBs) * cpi->last_boost) / 100;
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
@ -1275,21 +1218,6 @@ void vp8_update_rate_correction_factors(VP8_COMP *cpi, int damp_var)
}
}
static int estimate_bits_at_q(VP8_COMP *cpi, int Q)
{
int Bpm = (int)(.5 + cpi->rate_correction_factor * vp8_bits_per_mb[INTER_FRAME][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 (cpi->common.MBs > (1 << 11))
return (Bpm >> BPER_MB_NORMBITS) * cpi->common.MBs;
else
return (Bpm * cpi->common.MBs) >> BPER_MB_NORMBITS;
}
int vp8_regulate_q(VP8_COMP *cpi, int target_bits_per_frame)
{
@ -1580,45 +1508,10 @@ int vp8_pick_frame_size(VP8_COMP *cpi)
{
VP8_COMMON *cm = &cpi->common;
// First Frame is a special case
if (cm->current_video_frame == 0)
{
#if !(CONFIG_REALTIME_ONLY)
if (cpi->pass == 2)
calc_auto_iframe_target_size(cpi);
else
#endif
{
/* 1 Pass there is no information on which to base size so use
* bandwidth per second * fraction of the initial buffer
* level
*/
cpi->this_frame_target = cpi->oxcf.starting_buffer_level / 2;
if(cpi->this_frame_target > cpi->oxcf.target_bandwidth * 3 / 2)
cpi->this_frame_target = cpi->oxcf.target_bandwidth * 3 / 2;
}
// Key frame from VFW/auto-keyframe/first frame
cm->frame_type = KEY_FRAME;
}
// Special case for forced key frames
// The frame sizing here is still far from ideal for 2 pass.
else if (cm->frame_flags & FRAMEFLAGS_KEY)
{
if (cm->frame_type == KEY_FRAME)
calc_iframe_target_size(cpi);
}
else if (cm->frame_type == KEY_FRAME)
{
calc_auto_iframe_target_size(cpi);
}
else
{
// INTER frame: compute target frame size
cm->frame_type = INTER_FRAME;
calc_pframe_target_size(cpi);
// Check if we're dropping the frame:
@ -1629,19 +1522,5 @@ int vp8_pick_frame_size(VP8_COMP *cpi)
return 0;
}
}
/* Apply limits on keyframe target.
*
* TODO: move this after consolidating
* calc_iframe_target_size() and calc_auto_iframe_target_size()
*/
if (cm->frame_type == KEY_FRAME && cpi->oxcf.rc_max_intra_bitrate_pct)
{
unsigned int max_rate = cpi->av_per_frame_bandwidth
* cpi->oxcf.rc_max_intra_bitrate_pct / 100;
if (cpi->this_frame_target > max_rate)
cpi->this_frame_target = max_rate;
}
return 1;
}