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-rw-r--r--media/libvpx/libvpx/rate_hist.c292
1 files changed, 292 insertions, 0 deletions
diff --git a/media/libvpx/libvpx/rate_hist.c b/media/libvpx/libvpx/rate_hist.c
new file mode 100644
index 0000000000..947950d481
--- /dev/null
+++ b/media/libvpx/libvpx/rate_hist.c
@@ -0,0 +1,292 @@
+/*
+ * Copyright (c) 2014 The WebM project authors. All Rights Reserved.
+ *
+ * Use of this source code is governed by a BSD-style license
+ * that can be found in the LICENSE file in the root of the source
+ * tree. An additional intellectual property rights grant can be found
+ * in the file PATENTS. All contributing project authors may
+ * be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include <assert.h>
+#include <stdlib.h>
+#include <limits.h>
+#include <stdio.h>
+#include <math.h>
+
+#include "./rate_hist.h"
+
+#define RATE_BINS 100
+#define HIST_BAR_MAX 40
+
+struct hist_bucket {
+ int low;
+ int high;
+ int count;
+};
+
+struct rate_hist {
+ int64_t *pts;
+ int *sz;
+ int samples;
+ int frames;
+ struct hist_bucket bucket[RATE_BINS];
+ int total;
+};
+
+struct rate_hist *init_rate_histogram(const vpx_codec_enc_cfg_t *cfg,
+ const vpx_rational_t *fps) {
+ int i;
+ 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
+ // adjustment (5/4) to account for alt-refs
+ hist->samples = cfg->rc_buf_sz * 5 / 4 * fps->num / fps->den / 1000;
+
+ // prevent division by zero
+ if (hist->samples == 0) hist->samples = 1;
+
+ hist->frames = 0;
+ hist->total = 0;
+
+ hist->pts = calloc(hist->samples, sizeof(*hist->pts));
+ hist->sz = calloc(hist->samples, sizeof(*hist->sz));
+ for (i = 0; i < RATE_BINS; i++) {
+ hist->bucket[i].low = INT_MAX;
+ hist->bucket[i].high = 0;
+ hist->bucket[i].count = 0;
+ }
+
+ return hist;
+}
+
+void destroy_rate_histogram(struct rate_hist *hist) {
+ if (hist) {
+ free(hist->pts);
+ free(hist->sz);
+ free(hist);
+ }
+}
+
+void update_rate_histogram(struct rate_hist *hist,
+ const vpx_codec_enc_cfg_t *cfg,
+ const vpx_codec_cx_pkt_t *pkt) {
+ int i;
+ int64_t then = 0;
+ int64_t avg_bitrate = 0;
+ int64_t sum_sz = 0;
+ const int64_t now = pkt->data.frame.pts * 1000 *
+ (uint64_t)cfg->g_timebase.num /
+ (uint64_t)cfg->g_timebase.den;
+
+ 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;
+
+ if (now < cfg->rc_buf_initial_sz) return;
+
+ if (!cfg->rc_target_bitrate) return;
+
+ then = now;
+
+ /* Sum the size over the past rc_buf_sz ms */
+ for (i = hist->frames; i > 0 && hist->frames - i < hist->samples; i--) {
+ const int i_idx = (i - 1) % hist->samples;
+
+ then = hist->pts[i_idx];
+ if (now - then > cfg->rc_buf_sz) break;
+ sum_sz += hist->sz[i_idx];
+ }
+
+ if (now == then) return;
+
+ avg_bitrate = sum_sz * 8 * 1000 / (now - then);
+ idx = (int)(avg_bitrate * (RATE_BINS / 2) / (cfg->rc_target_bitrate * 1000));
+ if (idx < 0) idx = 0;
+ if (idx > RATE_BINS - 1) idx = RATE_BINS - 1;
+ if (hist->bucket[idx].low > avg_bitrate)
+ hist->bucket[idx].low = (int)avg_bitrate;
+ if (hist->bucket[idx].high < avg_bitrate)
+ hist->bucket[idx].high = (int)avg_bitrate;
+ hist->bucket[idx].count++;
+ hist->total++;
+}
+
+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;
+ 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++) {
+ 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 adjacent
+ * 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;
+ }
+ }
+
+ *num_buckets = buckets;
+ return bucket[big_bucket].count;
+}
+
+static void show_histogram(const struct hist_bucket *bucket, int buckets,
+ int total, int scale) {
+ int width1, width2;
+ int i;
+
+ if (!buckets) return;
+ assert(bucket != NULL);
+ assert(buckets > 0);
+
+ switch ((int)(log(bucket[buckets - 1].high) / log(10)) + 1) {
+ case 1:
+ case 2:
+ width1 = 4;
+ width2 = 2;
+ break;
+ case 3:
+ width1 = 5;
+ width2 = 3;
+ break;
+ case 4:
+ width1 = 6;
+ width2 = 4;
+ break;
+ case 5:
+ width1 = 7;
+ width2 = 5;
+ break;
+ case 6:
+ width1 = 8;
+ width2 = 6;
+ break;
+ case 7:
+ width1 = 9;
+ width2 = 7;
+ break;
+ default:
+ width1 = 12;
+ width2 = 10;
+ break;
+ }
+
+ for (i = 0; i < buckets; i++) {
+ int len;
+ int j;
+ float pct;
+
+ pct = (float)(100.0 * bucket[i].count / 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, "%*d %*s: ", width1, bucket[i].low, width2, "");
+ else
+ fprintf(stderr, "%*d-%*d: ", width1, bucket[i].low, width2,
+ 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);
+ }
+}
+
+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, "\nQuantizer Selection:\n");
+ scale = merge_hist_buckets(bucket, max_buckets, &buckets);
+ show_histogram(bucket, buckets, total, scale);
+}
+
+void show_rate_histogram(struct rate_hist *hist, const vpx_codec_enc_cfg_t *cfg,
+ int max_buckets) {
+ 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];
+ }
+
+ fprintf(stderr, "\nRate (over %dms window):\n", cfg->rc_buf_sz);
+ scale = merge_hist_buckets(hist->bucket, max_buckets, &buckets);
+ show_histogram(hist->bucket, buckets, hist->total, scale);
+}
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