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rate_hist: add parameter validation

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tolerate a NULL hist being passed as a result of invalid parameters
passed to init_rate_histogram(). this fixes a divide by zero in
init_rate_histogram() with an invalid fps.

BUG=webm:1383

Change-Id: Id203e0f3b18d67a4a09aaf206abcce4708f966ec
This commit is contained in:
James Zern 2017-03-23 14:47:07 -07:00
parent 10164407fb
commit 4ffdf60b85
1 changed files with 22 additions and 3 deletions
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25
rate_hist.c
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@ -37,7 +37,13 @@ struct rate_hist {
struct rate_hist *init_rate_histogram(const vpx_codec_enc_cfg_t *cfg,
const vpx_rational_t *fps) {
int i;
struct rate_hist *hist = malloc(sizeof(*hist));
struct rate_hist *hist = calloc(1, sizeof(*hist));
if (hist == NULL || cfg == NULL || fps == NULL || fps->num == 0 ||
fps->den == 0) {
destroy_rate_histogram(hist);
return NULL;
}
// Determine the number of samples in the buffer. Use the file's framerate
// to determine the number of frames in rc_buf_sz milliseconds, with an
@ -80,7 +86,11 @@ void update_rate_histogram(struct rate_hist *hist,
(uint64_t)cfg->g_timebase.num /
(uint64_t)cfg->g_timebase.den;
int idx = hist->frames++ % hist->samples;
int idx;
if (hist == NULL || cfg == NULL || pkt == NULL) return;
idx = hist->frames++ % hist->samples;
hist->pts[idx] = now;
hist->sz[idx] = (int)pkt->data.frame.sz;
@ -116,9 +126,14 @@ void update_rate_histogram(struct rate_hist *hist,
static int merge_hist_buckets(struct hist_bucket *bucket, int max_buckets,
int *num_buckets) {
int small_bucket = 0, merge_bucket = INT_MAX, big_bucket = 0;
int buckets = *num_buckets;
int buckets;
int i;
assert(bucket != NULL);
assert(num_buckets != NULL);
buckets = *num_buckets;
/* Find the extrema for this list of buckets */
big_bucket = small_bucket = 0;
for (i = 0; i < buckets; i++) {
@ -181,6 +196,8 @@ static void show_histogram(const struct hist_bucket *bucket, int buckets,
const char *pat1, *pat2;
int i;
assert(bucket != NULL);
switch ((int)(log(bucket[buckets - 1].high) / log(10)) + 1) {
case 1:
case 2:
@ -259,6 +276,8 @@ void show_rate_histogram(struct rate_hist *hist, const vpx_codec_enc_cfg_t *cfg,
int i, scale;
int buckets = 0;
if (hist == NULL || cfg == NULL) return;
for (i = 0; i < RATE_BINS; i++) {
if (hist->bucket[i].low == INT_MAX) continue;
hist->bucket[buckets++] = hist->bucket[i];