Commit 3fde9964 authored by John Koleszar's avatar John Koleszar

vpxenc: add quantizer histogram display

Add the --q-hist=n option, which displays a histogram with n buckets for
the quantizer selected on each frame.

Change-Id: I59b020c26b0acae0b938685081d9932bd98df5c9
parent 76495617
......@@ -23,6 +23,7 @@
#include <stdarg.h>
#include <string.h>
#include <limits.h>
#include <assert.h>
#include "vpx/vpx_encoder.h"
#if USE_POSIX_MMAP
#include <sys/types.h>
......@@ -909,12 +910,14 @@ static const arg_def_t framerate = ARG_DEF(NULL, "fps", 1,
"Stream frame rate (rate/scale)");
static const arg_def_t use_ivf = ARG_DEF(NULL, "ivf", 0,
"Output IVF (default is WebM)");
static const arg_def_t q_hist_n = ARG_DEF(NULL, "q-hist", 1,
"Show quantizer histogram (n-buckets)");
static const arg_def_t *main_args[] =
{
&debugmode,
&outputfile, &codecarg, &passes, &pass_arg, &fpf_name, &limit, &deadline,
&best_dl, &good_dl, &rt_dl,
&verbosearg, &psnrarg, &use_ivf,
&verbosearg, &psnrarg, &use_ivf, &q_hist_n,
NULL
};
......@@ -1107,6 +1110,149 @@ static void usage_exit()
exit(EXIT_FAILURE);
}
#define HIST_BAR_MAX 40
struct hist_bucket
{
int low, high, count;
};
static int merge_hist_buckets(struct hist_bucket *bucket,
int *buckets_,
int max_buckets)
{
int small_bucket = 0, merge_bucket = INT_MAX, big_bucket=0;
int buckets = *buckets_;
int i;
/* Find the extrema for this list of buckets */
big_bucket = small_bucket = 0;
for(i=0; i < buckets; i++)
{
if(bucket[i].count < bucket[small_bucket].count)
small_bucket = i;
if(bucket[i].count > bucket[big_bucket].count)
big_bucket = i;
}
/* If we have too many buckets, merge the smallest with an ajacent
* bucket.
*/
while(buckets > max_buckets)
{
int last_bucket = buckets - 1;
// merge the small bucket with an adjacent one.
if(small_bucket == 0)
merge_bucket = 1;
else if(small_bucket == last_bucket)
merge_bucket = last_bucket - 1;
else if(bucket[small_bucket - 1].count < bucket[small_bucket + 1].count)
merge_bucket = small_bucket - 1;
else
merge_bucket = small_bucket + 1;
assert(abs(merge_bucket - small_bucket) <= 1);
assert(small_bucket < buckets);
assert(big_bucket < buckets);
assert(merge_bucket < buckets);
if(merge_bucket < small_bucket)
{
bucket[merge_bucket].high = bucket[small_bucket].high;
bucket[merge_bucket].count += bucket[small_bucket].count;
}
else
{
bucket[small_bucket].high = bucket[merge_bucket].high;
bucket[small_bucket].count += bucket[merge_bucket].count;
merge_bucket = small_bucket;
}
assert(bucket[merge_bucket].low != bucket[merge_bucket].high);
buckets--;
/* Remove the merge_bucket from the list, and find the new small
* and big buckets while we're at it
*/
big_bucket = small_bucket = 0;
for(i=0; i < buckets; i++)
{
if(i > merge_bucket)
bucket[i] = bucket[i+1];
if(bucket[i].count < bucket[small_bucket].count)
small_bucket = i;
if(bucket[i].count > bucket[big_bucket].count)
big_bucket = i;
}
}
*buckets_ = buckets;
return bucket[big_bucket].count;
}
static void show_histogram(const struct hist_bucket *bucket,
int buckets,
int total,
int scale)
{
int i;
for(i=0; i<buckets; i++)
{
int len;
int j;
float pct;
pct = 100.0 * (float)bucket[i].count / (float)total;
len = HIST_BAR_MAX * bucket[i].count / scale;
if(len < 1)
len = 1;
assert(len <= HIST_BAR_MAX);
if(bucket[i].low == bucket[i].high)
fprintf(stderr, "%4d : ", bucket[i].low);
else
fprintf(stderr, "%4d-%2d: ", bucket[i].low, bucket[i].high);
for(j=0; j<HIST_BAR_MAX; j++)
fprintf(stderr, j<len?"=":" ");
fprintf(stderr, "\t%5d (%6.2f%%)\n",bucket[i].count,pct);
}
}
static void show_q_histogram(const int counts[64], int max_buckets)
{
struct hist_bucket bucket[64];
int buckets = 0;
int total = 0;
int scale;
int i;
for(i=0; i<64; i++)
{
if(counts[i])
{
bucket[buckets].low = bucket[buckets].high = i;
bucket[buckets].count = counts[i];
buckets++;
total += counts[i];
}
}
fprintf(stderr, "Quantizer Selection:\n");
scale = merge_hist_buckets(bucket, &buckets, max_buckets);
show_histogram(bucket, buckets, total, scale);
}
#define ARG_CTRL_CNT_MAX 10
int main(int argc, const char **argv_)
......@@ -1145,6 +1291,8 @@ int main(int argc, const char **argv_)
double psnr_totals[4] = {0, 0, 0, 0};
int psnr_count = 0;
stereo_format_t stereo_fmt = STEREO_FORMAT_MONO;
int counts[64]={0};
int show_q_hist_buckets=0;
exec_name = argv_[0];
ebml.last_pts_ms = -1;
......@@ -1228,6 +1376,8 @@ int main(int argc, const char **argv_)
out_fn = arg.val;
else if (arg_match(&arg, &debugmode, argi))
ebml.debug = 1;
else if (arg_match(&arg, &q_hist_n, argi))
show_q_hist_buckets = arg_parse_uint(&arg);
else
argj++;
}
......@@ -1648,6 +1798,16 @@ int main(int argc, const char **argv_)
vpx_usec_timer_mark(&timer);
cx_time += vpx_usec_timer_elapsed(&timer);
ctx_exit_on_error(&encoder, "Failed to encode frame");
if(cfg.g_pass != VPX_RC_FIRST_PASS)
{
int q;
vpx_codec_control(&encoder, VP8E_GET_LAST_QUANTIZER_64, &q);
ctx_exit_on_error(&encoder, "Failed to read quantizer");
counts[q]++;
}
got_data = 0;
while ((pkt = vpx_codec_get_cx_data(&encoder, &iter)))
......@@ -1758,6 +1918,9 @@ int main(int argc, const char **argv_)
break;
}
if (show_q_hist_buckets)
show_q_histogram(counts, show_q_hist_buckets);
vpx_img_free(&raw);
free(argv);
return EXIT_SUCCESS;
......
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