generic-library/vpx
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

Remove unused kf rate variables

Browse Source 
Remove tot_key_frame_bits and prior_key_frame_size[] as they were
tracked but never used. Remove intra_frame_target, as it was only
used to initialize prior_key_frame_size.

Refactor vp8_adjust_key_frame_context() some to remove unnecessary
calculations.

Change-Id: Icbc2c83d2b90e184be03e6f9679e678f3a4bce8f
This commit is contained in:
John Koleszar
2011-04-19 16:08:45 -04:00
parent c619f6cb0f
commit ad6a8ca58b
3 changed files with 51 additions and 65 deletions
Download Patch File Download Diff File Expand all files Collapse all files

104
vp8/encoder/ratectrl.c
View File

@@ -1452,86 +1452,83 @@ static int estimate_min_frame_size(VP8_COMP *cpi)
return (bits_per_mb_at_max_q * cpi->common.MBs) >> BPER_MB_NORMBITS;
}
void vp8_adjust_key_frame_context(VP8_COMP *cpi)
static int estimate_keyframe_frequency(VP8_COMP *cpi)
{
int i;
int av_key_frames_per_second;
// Average key frame frequency and size
unsigned int total_weight = 0;
unsigned int av_key_frame_frequency = 0;
unsigned int av_key_frame_bits = 0;
// Average key frame frequency
int av_key_frame_frequency = 0;
unsigned int output_frame_rate = (unsigned int)(100 * cpi->output_frame_rate);
unsigned int target_bandwidth = (unsigned int)(100 * cpi->target_bandwidth);
// Clear down mmx registers to allow floating point in what follows
vp8_clear_system_state(); //__asm emms;
// Update the count of total key frame bits
cpi->tot_key_frame_bits += cpi->projected_frame_size;
// First key frame at start of sequence is a special case. We have no frequency data.
/* First key frame at start of sequence is a special case. We have no
* frequency data.
*/
if (cpi->key_frame_count == 1)
{
av_key_frame_frequency = (int)cpi->output_frame_rate * 2; // Assume a default of 1 kf every 2 seconds
av_key_frame_bits = cpi->projected_frame_size;
av_key_frames_per_second = output_frame_rate / av_key_frame_frequency; // Note output_frame_rate not cpi->output_frame_rate
/* Assume a default of 1 kf every 2 seconds, or the max kf interval,
* whichever is smaller.
*/
av_key_frame_frequency = (int)cpi->output_frame_rate * 2;
if (av_key_frame_frequency > cpi->oxcf.key_freq)
av_key_frame_frequency = cpi->oxcf.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
/* 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_size[i] = cpi->prior_key_frame_size[i+1];
cpi->prior_key_frame_distance[i] = cpi->prior_key_frame_distance[i+1];
}
cpi->prior_key_frame_distance[i]
= cpi->prior_key_frame_distance[i+1];
else
{
cpi->prior_key_frame_size[i] = cpi->projected_frame_size;
cpi->prior_key_frame_distance[i] = last_kf_interval;
}
av_key_frame_bits += prior_key_frame_weight[i] * cpi->prior_key_frame_size[i];
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 += prior_key_frame_weight[i]
* cpi->prior_key_frame_distance[i];
total_weight += prior_key_frame_weight[i];
}
av_key_frame_bits /= total_weight;
av_key_frame_frequency /= total_weight;
av_key_frames_per_second = output_frame_rate / av_key_frame_frequency;
}
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?
if ((cpi->pass != 2) && (cpi->projected_frame_size > cpi->per_frame_bandwidth))
// Two-pass overspend handled elsewhere.
if ((cpi->pass != 2)
&& (cpi->projected_frame_size > cpi->per_frame_bandwidth))
{
// 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.
cpi->kf_overspend_bits += (cpi->projected_frame_size - cpi->per_frame_bandwidth) * 7 / 8;
cpi->gf_overspend_bits += (cpi->projected_frame_size - cpi->per_frame_bandwidth) * 1 / 8;
if(!av_key_frame_frequency)
av_key_frame_frequency = 60;
int overspend;
// Work out how much to try and recover per frame.
// For one pass we estimate the number of frames to spread it over based upon past history.
// For two pass we know how many frames there will be till the next kf.
if (cpi->pass == 2)
{
if (cpi->frames_to_key > 16)
cpi->kf_bitrate_adjustment = cpi->kf_overspend_bits / (int)cpi->frames_to_key;
else
cpi->kf_bitrate_adjustment = cpi->kf_overspend_bits / 16;
}
else
cpi->kf_bitrate_adjustment = cpi->kf_overspend_bits / (int)av_key_frame_frequency;
/* 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);
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;
@@ -1539,6 +1536,7 @@ void vp8_adjust_key_frame_context(VP8_COMP *cpi)
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: