1 files changed, 325 insertions, 0 deletions

diff --git a/common/stats.c b/common/stats.c
new file mode 100644
index 0000000..c5f1e50
--- /dev/null
+++ b/common/stats.c
@@ -0,0 +1,325 @@
+#include <stdatomic.h>
+#include <time.h>
+#include <unistd.h>
+
+#include "common.h"
+#include "global.h"
+#include "misc/linked_list.h"
+#include "misc/node.h"
+#include "msg.h"
+#include "options/m_option.h"
+#include "osdep/threads.h"
+#include "osdep/timer.h"
+#include "stats.h"
+
+struct stats_base {
+    struct mpv_global *global;
+
+    atomic_bool active;
+
+    mp_mutex lock;
+
+    struct {
+        struct stats_ctx *head, *tail;
+    } list;
+
+    struct stat_entry **entries;
+    int num_entries;
+
+    int64_t last_time;
+};
+
+struct stats_ctx {
+    struct stats_base *base;
+    const char *prefix;
+
+    struct {
+        struct stats_ctx *prev, *next;
+    } list;
+
+    struct stat_entry **entries;
+    int num_entries;
+};
+
+enum val_type {
+    VAL_UNSET = 0,
+    VAL_STATIC,
+    VAL_STATIC_SIZE,
+    VAL_INC,
+    VAL_TIME,
+    VAL_THREAD_CPU_TIME,
+};
+
+struct stat_entry {
+    char name[32];
+    const char *full_name; // including stats_ctx.prefix
+
+    enum val_type type;
+    double val_d;
+    int64_t val_rt;
+    int64_t val_th;
+    int64_t time_start_ns;
+    int64_t cpu_start_ns;
+    mp_thread_id thread_id;
+};
+
+#define IS_ACTIVE(ctx) \
+    (atomic_load_explicit(&(ctx)->base->active, memory_order_relaxed))
+
+static void stats_destroy(void *p)
+{
+    struct stats_base *stats = p;
+
+    // All entries must have been destroyed before this.
+    assert(!stats->list.head);
+
+    mp_mutex_destroy(&stats->lock);
+}
+
+void stats_global_init(struct mpv_global *global)
+{
+    assert(!global->stats);
+    struct stats_base *stats = talloc_zero(global, struct stats_base);
+    ta_set_destructor(stats, stats_destroy);
+    mp_mutex_init(&stats->lock);
+
+    global->stats = stats;
+    stats->global = global;
+}
+
+static void add_stat(struct mpv_node *list, struct stat_entry *e,
+                     const char *suffix, double num_val, char *text)
+{
+    struct mpv_node *ne = node_array_add(list, MPV_FORMAT_NODE_MAP);
+
+    node_map_add_string(ne, "name", suffix ?
+        mp_tprintf(80, "%s/%s", e->full_name, suffix) : e->full_name);
+    node_map_add_double(ne, "value", num_val);
+    if (text)
+        node_map_add_string(ne, "text", text);
+}
+
+static int cmp_entry(const void *p1, const void *p2)
+{
+    struct stat_entry **e1 = (void *)p1;
+    struct stat_entry **e2 = (void *)p2;
+    return strcmp((*e1)->full_name, (*e2)->full_name);
+}
+
+void stats_global_query(struct mpv_global *global, struct mpv_node *out)
+{
+    struct stats_base *stats = global->stats;
+    assert(stats);
+
+    mp_mutex_lock(&stats->lock);
+
+    atomic_store(&stats->active, true);
+
+    if (!stats->num_entries) {
+        for (struct stats_ctx *ctx = stats->list.head; ctx; ctx = ctx->list.next)
+        {
+            for (int n = 0; n < ctx->num_entries; n++) {
+                MP_TARRAY_APPEND(stats, stats->entries, stats->num_entries,
+                                 ctx->entries[n]);
+            }
+        }
+        if (stats->num_entries) {
+            qsort(stats->entries, stats->num_entries, sizeof(stats->entries[0]),
+                  cmp_entry);
+        }
+    }
+
+    node_init(out, MPV_FORMAT_NODE_ARRAY, NULL);
+
+    int64_t now = mp_time_ns();
+    if (stats->last_time) {
+        double t_ms = MP_TIME_NS_TO_MS(now - stats->last_time);
+        struct mpv_node *ne = node_array_add(out, MPV_FORMAT_NODE_MAP);
+        node_map_add_string(ne, "name", "poll-time");
+        node_map_add_double(ne, "value", t_ms);
+        node_map_add_string(ne, "text", mp_tprintf(80, "%.2f ms", t_ms));
+
+        // Very dirty way to reset everything if the stats.lua page was probably
+        // closed. Not enough energy left for clean solution. Fuck it.
+        if (t_ms > 2000) {
+            for (int n = 0; n < stats->num_entries; n++) {
+                struct stat_entry *e = stats->entries[n];
+
+                e->cpu_start_ns = 0;
+                e->val_rt = e->val_th = 0;
+                if (e->type != VAL_THREAD_CPU_TIME)
+                    e->type = 0;
+            }
+        }
+    }
+    stats->last_time = now;
+
+    for (int n = 0; n < stats->num_entries; n++) {
+        struct stat_entry *e = stats->entries[n];
+
+        switch (e->type) {
+        case VAL_STATIC:
+            add_stat(out, e, NULL, e->val_d, NULL);
+            break;
+        case VAL_STATIC_SIZE: {
+            char *s = format_file_size(e->val_d);
+            add_stat(out, e, NULL, e->val_d, s);
+            talloc_free(s);
+            break;
+        }
+        case VAL_INC:
+            add_stat(out, e, NULL, e->val_d, NULL);
+            e->val_d = 0;
+            break;
+        case VAL_TIME: {
+            double t_cpu = MP_TIME_NS_TO_MS(e->val_th);
+            add_stat(out, e, "cpu", t_cpu, mp_tprintf(80, "%.2f ms", t_cpu));
+            double t_rt = MP_TIME_NS_TO_MS(e->val_rt);
+            add_stat(out, e, "time", t_rt, mp_tprintf(80, "%.2f ms", t_rt));
+            e->val_rt = e->val_th = 0;
+            break;
+        }
+        case VAL_THREAD_CPU_TIME: {
+            int64_t t = mp_thread_cpu_time_ns(e->thread_id);
+            if (!e->cpu_start_ns)
+                e->cpu_start_ns = t;
+            double t_msec = MP_TIME_NS_TO_MS(t - e->cpu_start_ns);
+            add_stat(out, e, NULL, t_msec, mp_tprintf(80, "%.2f ms", t_msec));
+            e->cpu_start_ns = t;
+            break;
+        }
+        default: ;
+        }
+    }
+
+    mp_mutex_unlock(&stats->lock);
+}
+
+static void stats_ctx_destroy(void *p)
+{
+    struct stats_ctx *ctx = p;
+
+    mp_mutex_lock(&ctx->base->lock);
+    LL_REMOVE(list, &ctx->base->list, ctx);
+    ctx->base->num_entries = 0; // invalidate
+    mp_mutex_unlock(&ctx->base->lock);
+}
+
+struct stats_ctx *stats_ctx_create(void *ta_parent, struct mpv_global *global,
+                                   const char *prefix)
+{
+    struct stats_base *base = global->stats;
+    assert(base);
+
+    struct stats_ctx *ctx = talloc_zero(ta_parent, struct stats_ctx);
+    ctx->base = base;
+    ctx->prefix = talloc_strdup(ctx, prefix);
+    ta_set_destructor(ctx, stats_ctx_destroy);
+
+    mp_mutex_lock(&base->lock);
+    LL_APPEND(list, &base->list, ctx);
+    base->num_entries = 0; // invalidate
+    mp_mutex_unlock(&base->lock);
+
+    return ctx;
+}
+
+static struct stat_entry *find_entry(struct stats_ctx *ctx, const char *name)
+{
+    for (int n = 0; n < ctx->num_entries; n++) {
+        if (strcmp(ctx->entries[n]->name, name) == 0)
+            return ctx->entries[n];
+    }
+
+    struct stat_entry *e = talloc_zero(ctx, struct stat_entry);
+    snprintf(e->name, sizeof(e->name), "%s", name);
+    assert(strcmp(e->name, name) == 0); // make e->name larger and don't complain
+
+    e->full_name = talloc_asprintf(e, "%s/%s", ctx->prefix, e->name);
+
+    MP_TARRAY_APPEND(ctx, ctx->entries, ctx->num_entries, e);
+    ctx->base->num_entries = 0; // invalidate
+
+    return e;
+}
+
+static void static_value(struct stats_ctx *ctx, const char *name, double val,
+                         enum val_type type)
+{
+    if (!IS_ACTIVE(ctx))
+        return;
+    mp_mutex_lock(&ctx->base->lock);
+    struct stat_entry *e = find_entry(ctx, name);
+    e->val_d = val;
+    e->type = type;
+    mp_mutex_unlock(&ctx->base->lock);
+}
+
+void stats_value(struct stats_ctx *ctx, const char *name, double val)
+{
+    static_value(ctx, name, val, VAL_STATIC);
+}
+
+void stats_size_value(struct stats_ctx *ctx, const char *name, double val)
+{
+    static_value(ctx, name, val, VAL_STATIC_SIZE);
+}
+
+void stats_time_start(struct stats_ctx *ctx, const char *name)
+{
+    MP_STATS(ctx->base->global, "start %s", name);
+    if (!IS_ACTIVE(ctx))
+        return;
+    mp_mutex_lock(&ctx->base->lock);
+    struct stat_entry *e = find_entry(ctx, name);
+    e->cpu_start_ns = mp_thread_cpu_time_ns(mp_thread_current_id());
+    e->time_start_ns = mp_time_ns();
+    mp_mutex_unlock(&ctx->base->lock);
+}
+
+void stats_time_end(struct stats_ctx *ctx, const char *name)
+{
+    MP_STATS(ctx->base->global, "end %s", name);
+    if (!IS_ACTIVE(ctx))
+        return;
+    mp_mutex_lock(&ctx->base->lock);
+    struct stat_entry *e = find_entry(ctx, name);
+    if (e->time_start_ns) {
+        e->type = VAL_TIME;
+        e->val_rt += mp_time_ns() - e->time_start_ns;
+        e->val_th += mp_thread_cpu_time_ns(mp_thread_current_id()) - e->cpu_start_ns;
+        e->time_start_ns = 0;
+    }
+    mp_mutex_unlock(&ctx->base->lock);
+}
+
+void stats_event(struct stats_ctx *ctx, const char *name)
+{
+    if (!IS_ACTIVE(ctx))
+        return;
+    mp_mutex_lock(&ctx->base->lock);
+    struct stat_entry *e = find_entry(ctx, name);
+    e->val_d += 1;
+    e->type = VAL_INC;
+    mp_mutex_unlock(&ctx->base->lock);
+}
+
+static void register_thread(struct stats_ctx *ctx, const char *name,
+                            enum val_type type)
+{
+    mp_mutex_lock(&ctx->base->lock);
+    struct stat_entry *e = find_entry(ctx, name);
+    e->type = type;
+    e->thread_id = mp_thread_current_id();
+    mp_mutex_unlock(&ctx->base->lock);
+}
+
+void stats_register_thread_cputime(struct stats_ctx *ctx, const char *name)
+{
+    register_thread(ctx, name, VAL_THREAD_CPU_TIME);
+}
+
+void stats_unregister_thread(struct stats_ctx *ctx, const char *name)
+{
+    register_thread(ctx, name, 0);
+}