Move to kernel style SPDX license identifiers
[babeltrace.git] / src / plugins / utils / trimmer / trimmer.c
index 85c8917daeb4cf28955ea669453bb645a2057374..5b3a6c35d2c2918b4b4e47b9bb8c96f64427221d 100644 (file)
@@ -1,39 +1,25 @@
 /*
+ * SPDX-License-Identifier: MIT
+ *
  * Copyright 2016 Jérémie Galarneau <jeremie.galarneau@efficios.com>
  * Copyright 2019 Philippe Proulx <pproulx@efficios.com>
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
  */
 
-#define BT_COMP_LOG_SELF_COMP (trimmer_comp->self_comp)
 #define BT_LOG_OUTPUT_LEVEL (trimmer_comp->log_level)
 #define BT_LOG_TAG "PLUGIN/FLT.UTILS.TRIMMER"
-#include "plugins/comp-logging.h"
+#include "logging/comp-logging.h"
 
 #include "compat/utc.h"
 #include "compat/time.h"
 #include <babeltrace2/babeltrace.h>
 #include "common/common.h"
 #include "common/assert.h"
+#include <stdbool.h>
 #include <stdint.h>
 #include <inttypes.h>
 #include <glib.h>
+#include "compat/glib.h"
+#include "plugins/common/param-validation/param-validation.h"
 
 #include "trimmer.h"
 
@@ -74,6 +60,7 @@ struct trimmer_comp {
        bool is_gmt;
        bt_logging_level log_level;
        bt_self_component *self_comp;
+       bt_self_component_filter *self_comp_filter;
 };
 
 enum trimmer_iterator_state {
@@ -111,7 +98,7 @@ struct trimmer_iterator {
        enum trimmer_iterator_state state;
 
        /* Owned by this */
-       bt_self_component_port_input_message_iterator *upstream_iter;
+       bt_message_iterator *upstream_iter;
        struct trimmer_bound begin, end;
 
        /*
@@ -130,21 +117,12 @@ struct trimmer_iterator {
 };
 
 struct trimmer_iterator_stream_state {
-       /*
-        * True if the last pushed message for this stream was a stream
-        * activity end message.
-        */
-       bool last_msg_is_stream_activity_end;
-
-       /*
-        * Time to use for a generated stream end activity message when
-        * ending the stream.
-        */
-       int64_t stream_act_end_ns_from_origin;
-
        /* Weak */
        const bt_stream *stream;
 
+       /* Have we seen a message with clock_snapshot going through this stream? */
+       bool seen_clock_snapshot;
+
        /* Owned by this (`NULL` initially and between packets) */
        const bt_packet *cur_packet;
 };
@@ -430,10 +408,13 @@ int set_bound_from_str(struct trimmer_comp *trimmer_comp,
                goto end;
        }
 
-       BT_COMP_LOGE("Invalid date/time format: param=\"%s\"", str);
+       BT_COMP_LOGE_APPEND_CAUSE(trimmer_comp->self_comp,
+               "Invalid date/time format: param=\"%s\"", str);
        ret = -1;
 
 end:
+       g_match_info_free(match_info);
+
        return ret;
 }
 
@@ -453,7 +434,7 @@ int set_bound_from_param(struct trimmer_comp *trimmer_comp,
        char tmp_arg[64];
 
        if (bt_value_is_signed_integer(param)) {
-               int64_t value = bt_value_signed_integer_get(param);
+               int64_t value = bt_value_integer_signed_get(param);
 
                /*
                 * Just convert it to a temporary string to handle
@@ -461,18 +442,13 @@ int set_bound_from_param(struct trimmer_comp *trimmer_comp,
                 */
                sprintf(tmp_arg, "%" PRId64, value);
                arg = tmp_arg;
-       } else if (bt_value_is_string(param)) {
-               arg = bt_value_string_get(param);
        } else {
-               BT_COMP_LOGE("`%s` parameter must be an integer or a string value.",
-                       param_name);
-               ret = -1;
-               goto end;
+               BT_ASSERT(bt_value_is_string(param));
+               arg = bt_value_string_get(param);
        }
 
        ret = set_bound_from_str(trimmer_comp, arg, bound, is_gmt);
 
-end:
        return ret;
 }
 
@@ -487,7 +463,8 @@ int validate_trimmer_bounds(struct trimmer_comp *trimmer_comp,
 
        if (!begin->is_infinite && !end->is_infinite &&
                        begin->ns_from_origin > end->ns_from_origin) {
-               BT_COMP_LOGE("Trimming time range's beginning time is greater than end time: "
+               BT_COMP_LOGE_APPEND_CAUSE(trimmer_comp->self_comp,
+                       "Trimming time range's beginning time is greater than end time: "
                        "begin-ns-from-origin=%" PRId64 ", "
                        "end-ns-from-origin=%" PRId64,
                        begin->ns_from_origin,
@@ -497,7 +474,8 @@ int validate_trimmer_bounds(struct trimmer_comp *trimmer_comp,
        }
 
        if (!begin->is_infinite && begin->ns_from_origin == INT64_MIN) {
-               BT_COMP_LOGE("Invalid trimming time range's beginning time: "
+               BT_COMP_LOGE_APPEND_CAUSE(trimmer_comp->self_comp,
+                       "Invalid trimming time range's beginning time: "
                        "ns-from-origin=%" PRId64,
                        begin->ns_from_origin);
                ret = -1;
@@ -505,7 +483,8 @@ int validate_trimmer_bounds(struct trimmer_comp *trimmer_comp,
        }
 
        if (!end->is_infinite && end->ns_from_origin == INT64_MIN) {
-               BT_COMP_LOGE("Invalid trimming time range's end time: "
+               BT_COMP_LOGE_APPEND_CAUSE(trimmer_comp->self_comp,
+                       "Invalid trimming time range's end time: "
                        "ns-from-origin=%" PRId64,
                        end->ns_from_origin);
                ret = -1;
@@ -517,11 +496,53 @@ end:
 }
 
 static
-int init_trimmer_comp_from_params(struct trimmer_comp *trimmer_comp,
+enum bt_param_validation_status validate_bound_type(
+               const bt_value *value,
+               struct bt_param_validation_context *context)
+{
+       enum bt_param_validation_status status = BT_PARAM_VALIDATION_STATUS_OK;
+
+       if (!bt_value_is_signed_integer(value) &&
+                       !bt_value_is_string(value)) {
+               status = bt_param_validation_error(context,
+                       "unexpected type: expected-types=[%s, %s], actual-type=%s",
+                       bt_common_value_type_string(BT_VALUE_TYPE_SIGNED_INTEGER),
+                       bt_common_value_type_string(BT_VALUE_TYPE_STRING),
+                       bt_common_value_type_string(bt_value_get_type(value)));
+       }
+
+       return status;
+}
+
+static
+struct bt_param_validation_map_value_entry_descr trimmer_params[] = {
+       { "gmt", BT_PARAM_VALIDATION_MAP_VALUE_ENTRY_OPTIONAL, { .type = BT_VALUE_TYPE_BOOL } },
+       { "begin", BT_PARAM_VALIDATION_MAP_VALUE_ENTRY_OPTIONAL, { .validation_func = validate_bound_type } },
+       { "end", BT_PARAM_VALIDATION_MAP_VALUE_ENTRY_OPTIONAL, { .validation_func = validate_bound_type } },
+       BT_PARAM_VALIDATION_MAP_VALUE_ENTRY_END
+};
+
+static
+bt_component_class_initialize_method_status init_trimmer_comp_from_params(
+               struct trimmer_comp *trimmer_comp,
                const bt_value *params)
 {
        const bt_value *value;
-       int ret = 0;
+       bt_component_class_initialize_method_status status;
+       enum bt_param_validation_status validation_status;
+       gchar *validate_error = NULL;
+
+       validation_status = bt_param_validation_validate(params,
+               trimmer_params, &validate_error);
+       if (validation_status == BT_PARAM_VALIDATION_STATUS_MEMORY_ERROR) {
+               status = BT_COMPONENT_CLASS_INITIALIZE_METHOD_STATUS_MEMORY_ERROR;
+               goto end;
+       } else if (validation_status == BT_PARAM_VALIDATION_STATUS_VALIDATION_ERROR) {
+               status = BT_COMPONENT_CLASS_INITIALIZE_METHOD_STATUS_ERROR;
+               BT_COMP_LOGE_APPEND_CAUSE(trimmer_comp->self_comp, "%s",
+                       validate_error);
+               goto end;
+       }
 
        BT_ASSERT(params);
         value = bt_value_map_borrow_entry_value_const(params, "gmt");
@@ -534,7 +555,7 @@ int init_trimmer_comp_from_params(struct trimmer_comp *trimmer_comp,
                if (set_bound_from_param(trimmer_comp, "begin", value,
                                &trimmer_comp->begin, trimmer_comp->is_gmt)) {
                        /* set_bound_from_param() logs errors */
-                       ret = -1;
+                       status = BT_COMPONENT_CLASS_INITIALIZE_METHOD_STATUS_ERROR;
                        goto end;
                }
        } else {
@@ -547,7 +568,7 @@ int init_trimmer_comp_from_params(struct trimmer_comp *trimmer_comp,
                if (set_bound_from_param(trimmer_comp, "end", value,
                                &trimmer_comp->end, trimmer_comp->is_gmt)) {
                        /* set_bound_from_param() logs errors */
-                       ret = -1;
+                       status = BT_COMPONENT_CLASS_INITIALIZE_METHOD_STATUS_ERROR;
                        goto end;
                }
        } else {
@@ -555,75 +576,69 @@ int init_trimmer_comp_from_params(struct trimmer_comp *trimmer_comp,
                trimmer_comp->end.is_set = true;
        }
 
-end:
        if (trimmer_comp->begin.is_set && trimmer_comp->end.is_set) {
                /* validate_trimmer_bounds() logs errors */
-               ret = validate_trimmer_bounds(trimmer_comp,
-                       &trimmer_comp->begin, &trimmer_comp->end);
+               if (validate_trimmer_bounds(trimmer_comp,
+                       &trimmer_comp->begin, &trimmer_comp->end)) {
+                       status = BT_COMPONENT_CLASS_INITIALIZE_METHOD_STATUS_ERROR;
+                       goto end;
+               }
        }
 
-       return ret;
+       status = BT_COMPONENT_CLASS_INITIALIZE_METHOD_STATUS_OK;
+
+end:
+       g_free(validate_error);
+
+       return status;
 }
 
-bt_component_class_init_method_status trimmer_init(
+bt_component_class_initialize_method_status trimmer_init(
                bt_self_component_filter *self_comp_flt,
+               bt_self_component_filter_configuration *config,
                const bt_value *params, void *init_data)
 {
-       int ret;
-       bt_component_class_init_method_status status =
-               BT_COMPONENT_CLASS_INIT_METHOD_STATUS_OK;
+       bt_component_class_initialize_method_status status;
        bt_self_component_add_port_status add_port_status;
        struct trimmer_comp *trimmer_comp = create_trimmer_comp();
        bt_self_component *self_comp =
                bt_self_component_filter_as_self_component(self_comp_flt);
+
        if (!trimmer_comp) {
-               status = BT_COMPONENT_CLASS_INIT_METHOD_STATUS_MEMORY_ERROR;
+               status = BT_COMPONENT_CLASS_INITIALIZE_METHOD_STATUS_MEMORY_ERROR;
                goto error;
        }
 
        trimmer_comp->log_level = bt_component_get_logging_level(
                bt_self_component_as_component(self_comp));
        trimmer_comp->self_comp = self_comp;
+       trimmer_comp->self_comp_filter = self_comp_flt;
+
        add_port_status = bt_self_component_filter_add_input_port(
                self_comp_flt, in_port_name, NULL, NULL);
-       switch (add_port_status) {
-       case BT_SELF_COMPONENT_ADD_PORT_STATUS_ERROR:
-               status = BT_COMPONENT_CLASS_INIT_METHOD_STATUS_ERROR;
-               goto error;
-       case BT_SELF_COMPONENT_ADD_PORT_STATUS_MEMORY_ERROR:
-               status = BT_COMPONENT_CLASS_INIT_METHOD_STATUS_MEMORY_ERROR;
+       if (add_port_status != BT_SELF_COMPONENT_ADD_PORT_STATUS_OK) {
+               status = (int) add_port_status;
                goto error;
-       default:
-               break;
        }
 
        add_port_status = bt_self_component_filter_add_output_port(
                self_comp_flt, "out", NULL, NULL);
-       switch (add_port_status) {
-       case BT_SELF_COMPONENT_ADD_PORT_STATUS_ERROR:
-               status = BT_COMPONENT_CLASS_INIT_METHOD_STATUS_ERROR;
-               goto error;
-       case BT_SELF_COMPONENT_ADD_PORT_STATUS_MEMORY_ERROR:
-               status = BT_COMPONENT_CLASS_INIT_METHOD_STATUS_MEMORY_ERROR;
+       if (add_port_status != BT_SELF_COMPONENT_ADD_PORT_STATUS_OK) {
+               status = (int) add_port_status;
                goto error;
-       default:
-               break;
        }
 
-       ret = init_trimmer_comp_from_params(trimmer_comp, params);
-       if (ret) {
-               status = BT_COMPONENT_CLASS_INIT_METHOD_STATUS_ERROR;
+       status = init_trimmer_comp_from_params(trimmer_comp, params);
+       if (status != BT_COMPONENT_CLASS_INITIALIZE_METHOD_STATUS_OK) {
                goto error;
        }
 
        bt_self_component_set_data(self_comp, trimmer_comp);
+
+       status = BT_COMPONENT_CLASS_INITIALIZE_METHOD_STATUS_OK;
        goto end;
 
 error:
-       if (status == BT_COMPONENT_CLASS_INIT_METHOD_STATUS_OK) {
-               status = BT_COMPONENT_CLASS_INIT_METHOD_STATUS_ERROR;
-       }
-
        if (trimmer_comp) {
                destroy_trimmer_comp(trimmer_comp);
        }
@@ -635,8 +650,11 @@ end:
 static
 void destroy_trimmer_iterator(struct trimmer_iterator *trimmer_it)
 {
-       BT_ASSERT(trimmer_it);
-       bt_self_component_port_input_message_iterator_put_ref(
+       if (!trimmer_it) {
+               goto end;
+       }
+
+       bt_message_iterator_put_ref(
                trimmer_it->upstream_iter);
 
        if (trimmer_it->output_messages) {
@@ -648,6 +666,8 @@ void destroy_trimmer_iterator(struct trimmer_iterator *trimmer_it)
        }
 
        g_free(trimmer_it);
+end:
+       return;
 }
 
 static
@@ -660,23 +680,25 @@ void destroy_trimmer_iterator_stream_state(
 }
 
 BT_HIDDEN
-bt_component_class_message_iterator_init_method_status trimmer_msg_iter_init(
+bt_message_iterator_class_initialize_method_status trimmer_msg_iter_init(
                bt_self_message_iterator *self_msg_iter,
-               bt_self_component_filter *self_comp,
+               bt_self_message_iterator_configuration *config,
                bt_self_component_port_output *port)
 {
-       bt_component_class_message_iterator_init_method_status status =
-               BT_COMPONENT_CLASS_MESSAGE_ITERATOR_INIT_METHOD_STATUS_OK;
+       bt_message_iterator_class_initialize_method_status status;
+       bt_message_iterator_create_from_message_iterator_status
+               msg_iter_status;
        struct trimmer_iterator *trimmer_it;
+       bt_self_component *self_comp =
+               bt_self_message_iterator_borrow_component(self_msg_iter);
 
        trimmer_it = g_new0(struct trimmer_iterator, 1);
        if (!trimmer_it) {
-               status = BT_COMPONENT_CLASS_MESSAGE_ITERATOR_INIT_METHOD_STATUS_MEMORY_ERROR;
-               goto end;
+               status = BT_MESSAGE_ITERATOR_CLASS_INITIALIZE_METHOD_STATUS_MEMORY_ERROR;
+               goto error;
        }
 
-       trimmer_it->trimmer_comp = bt_self_component_get_data(
-               bt_self_component_filter_as_self_component(self_comp));
+       trimmer_it->trimmer_comp = bt_self_component_get_data(self_comp);
        BT_ASSERT(trimmer_it->trimmer_comp);
 
        if (trimmer_it->trimmer_comp->begin.is_set &&
@@ -692,52 +714,62 @@ bt_component_class_message_iterator_init_method_status trimmer_msg_iter_init(
 
        trimmer_it->begin = trimmer_it->trimmer_comp->begin;
        trimmer_it->end = trimmer_it->trimmer_comp->end;
-       trimmer_it->upstream_iter =
-               bt_self_component_port_input_message_iterator_create(
+       msg_iter_status =
+               bt_message_iterator_create_from_message_iterator(
+                       self_msg_iter,
                        bt_self_component_filter_borrow_input_port_by_name(
-                               self_comp, in_port_name));
-       if (!trimmer_it->upstream_iter) {
-               status = BT_COMPONENT_CLASS_MESSAGE_ITERATOR_INIT_METHOD_STATUS_ERROR;
-               goto end;
+                               trimmer_it->trimmer_comp->self_comp_filter, in_port_name),
+                       &trimmer_it->upstream_iter);
+       if (msg_iter_status != BT_MESSAGE_ITERATOR_CREATE_FROM_MESSAGE_ITERATOR_STATUS_OK) {
+               status = (int) msg_iter_status;
+               goto error;
        }
 
        trimmer_it->output_messages = g_queue_new();
        if (!trimmer_it->output_messages) {
-               status = BT_COMPONENT_CLASS_MESSAGE_ITERATOR_INIT_METHOD_STATUS_MEMORY_ERROR;
-               goto end;
+               status = BT_MESSAGE_ITERATOR_CLASS_INITIALIZE_METHOD_STATUS_MEMORY_ERROR;
+               goto error;
        }
 
        trimmer_it->stream_states = g_hash_table_new_full(g_direct_hash,
                g_direct_equal, NULL,
                (GDestroyNotify) destroy_trimmer_iterator_stream_state);
        if (!trimmer_it->stream_states) {
-               status = BT_COMPONENT_CLASS_MESSAGE_ITERATOR_INIT_METHOD_STATUS_MEMORY_ERROR;
-               goto end;
+               status = BT_MESSAGE_ITERATOR_CLASS_INITIALIZE_METHOD_STATUS_MEMORY_ERROR;
+               goto error;
        }
 
+       /*
+        * The trimmer requires upstream messages to have times, so it can
+        * always seek forward.
+        */
+       bt_self_message_iterator_configuration_set_can_seek_forward(
+               config, BT_TRUE);
+
        trimmer_it->self_msg_iter = self_msg_iter;
        bt_self_message_iterator_set_data(self_msg_iter, trimmer_it);
 
-end:
-       if (status != BT_COMPONENT_CLASS_MESSAGE_ITERATOR_INIT_METHOD_STATUS_OK && trimmer_it) {
-               destroy_trimmer_iterator(trimmer_it);
-       }
+       status = BT_MESSAGE_ITERATOR_CLASS_INITIALIZE_METHOD_STATUS_OK;
+       goto end;
 
+error:
+       destroy_trimmer_iterator(trimmer_it);
+
+end:
        return status;
 }
 
 static inline
 int get_msg_ns_from_origin(const bt_message *msg, int64_t *ns_from_origin,
-               bool *skip)
+               bool *has_clock_snapshot)
 {
        const bt_clock_class *clock_class = NULL;
        const bt_clock_snapshot *clock_snapshot = NULL;
-       bt_message_stream_activity_clock_snapshot_state sa_cs_state;
        int ret = 0;
 
-       BT_ASSERT(msg);
-       BT_ASSERT(ns_from_origin);
-       BT_ASSERT(skip);
+       BT_ASSERT_DBG(msg);
+       BT_ASSERT_DBG(ns_from_origin);
+       BT_ASSERT_DBG(has_clock_snapshot);
 
        switch (bt_message_get_type(msg)) {
        case BT_MESSAGE_TYPE_EVENT:
@@ -773,70 +805,65 @@ int get_msg_ns_from_origin(const bt_message *msg, int64_t *ns_from_origin,
                clock_snapshot = bt_message_packet_end_borrow_default_clock_snapshot_const(
                        msg);
                break;
-       case BT_MESSAGE_TYPE_DISCARDED_EVENTS:
+       case BT_MESSAGE_TYPE_STREAM_BEGINNING:
+       {
+               enum bt_message_stream_clock_snapshot_state cs_state;
+
                clock_class =
-                       bt_message_discarded_events_borrow_stream_class_default_clock_class_const(
-                               msg);
+                       bt_message_stream_beginning_borrow_stream_class_default_clock_class_const(msg);
                if (G_UNLIKELY(!clock_class)) {
                        goto error;
                }
 
-               clock_snapshot = bt_message_discarded_events_borrow_beginning_default_clock_snapshot_const(
-                       msg);
-               break;
-       case BT_MESSAGE_TYPE_DISCARDED_PACKETS:
-               clock_class =
-                       bt_message_discarded_packets_borrow_stream_class_default_clock_class_const(
-                               msg);
-               if (G_UNLIKELY(!clock_class)) {
-                       goto error;
+               cs_state = bt_message_stream_beginning_borrow_default_clock_snapshot_const(msg, &clock_snapshot);
+               if (cs_state != BT_MESSAGE_STREAM_CLOCK_SNAPSHOT_STATE_KNOWN) {
+                       goto no_clock_snapshot;
                }
 
-               clock_snapshot = bt_message_discarded_packets_borrow_beginning_default_clock_snapshot_const(
-                       msg);
                break;
-       case BT_MESSAGE_TYPE_STREAM_ACTIVITY_BEGINNING:
+       }
+       case BT_MESSAGE_TYPE_STREAM_END:
+       {
+               enum bt_message_stream_clock_snapshot_state cs_state;
+
                clock_class =
-                       bt_message_stream_activity_beginning_borrow_stream_class_default_clock_class_const(
-                               msg);
+                       bt_message_stream_end_borrow_stream_class_default_clock_class_const(msg);
                if (G_UNLIKELY(!clock_class)) {
                        goto error;
                }
 
-               sa_cs_state = bt_message_stream_activity_beginning_borrow_default_clock_snapshot_const(
-                       msg, &clock_snapshot);
-               if (sa_cs_state == BT_MESSAGE_STREAM_ACTIVITY_CLOCK_SNAPSHOT_STATE_UNKNOWN ||
-                               sa_cs_state == BT_MESSAGE_STREAM_ACTIVITY_CLOCK_SNAPSHOT_STATE_INFINITE) {
-                       /* Lowest possible time to always include them */
-                       *ns_from_origin = INT64_MIN;
+               cs_state = bt_message_stream_end_borrow_default_clock_snapshot_const(msg, &clock_snapshot);
+               if (cs_state != BT_MESSAGE_STREAM_CLOCK_SNAPSHOT_STATE_KNOWN) {
                        goto no_clock_snapshot;
                }
 
                break;
-       case BT_MESSAGE_TYPE_STREAM_ACTIVITY_END:
+       }
+       case BT_MESSAGE_TYPE_DISCARDED_EVENTS:
                clock_class =
-                       bt_message_stream_activity_end_borrow_stream_class_default_clock_class_const(
+                       bt_message_discarded_events_borrow_stream_class_default_clock_class_const(
                                msg);
                if (G_UNLIKELY(!clock_class)) {
                        goto error;
                }
 
-               sa_cs_state = bt_message_stream_activity_end_borrow_default_clock_snapshot_const(
-                       msg, &clock_snapshot);
-               if (sa_cs_state == BT_MESSAGE_STREAM_ACTIVITY_CLOCK_SNAPSHOT_STATE_UNKNOWN) {
-                       /* Lowest time to always include it */
-                       *ns_from_origin = INT64_MIN;
-                       goto no_clock_snapshot;
-               } else if (sa_cs_state == BT_MESSAGE_STREAM_ACTIVITY_CLOCK_SNAPSHOT_STATE_INFINITE) {
-                       /* Greatest time to always exclude it */
-                       *ns_from_origin = INT64_MAX;
-                       goto no_clock_snapshot;
+               clock_snapshot = bt_message_discarded_events_borrow_beginning_default_clock_snapshot_const(
+                       msg);
+               break;
+       case BT_MESSAGE_TYPE_DISCARDED_PACKETS:
+               clock_class =
+                       bt_message_discarded_packets_borrow_stream_class_default_clock_class_const(
+                               msg);
+               if (G_UNLIKELY(!clock_class)) {
+                       goto error;
                }
 
+               clock_snapshot = bt_message_discarded_packets_borrow_beginning_default_clock_snapshot_const(
+                       msg);
                break;
        case BT_MESSAGE_TYPE_MESSAGE_ITERATOR_INACTIVITY:
                clock_snapshot =
-                       bt_message_message_iterator_inactivity_borrow_default_clock_snapshot_const(
+                       bt_message_message_iterator_inactivity_borrow_clock_snapshot_const(
                                msg);
                break;
        default:
@@ -849,10 +876,11 @@ int get_msg_ns_from_origin(const bt_message *msg, int64_t *ns_from_origin,
                goto error;
        }
 
+       *has_clock_snapshot = true;
        goto end;
 
 no_clock_snapshot:
-       *skip = true;
+       *has_clock_snapshot = false;
        goto end;
 
 error:
@@ -879,6 +907,7 @@ int set_trimmer_iterator_bound(struct trimmer_iterator *trimmer_it,
 {
        struct trimmer_comp *trimmer_comp = trimmer_it->trimmer_comp;
        struct tm tm;
+       struct tm *res;
        time_t time_seconds = (time_t) (ns_from_origin / NS_PER_S);
        int ret = 0;
 
@@ -887,14 +916,15 @@ int set_trimmer_iterator_bound(struct trimmer_iterator *trimmer_it,
 
        /* We only need to extract the date from this time */
        if (is_gmt) {
-               bt_gmtime_r(&time_seconds, &tm);
+               res = bt_gmtime_r(&time_seconds, &tm);
        } else {
-               bt_localtime_r(&time_seconds, &tm);
+               res = bt_localtime_r(&time_seconds, &tm);
        }
 
-       if (errno) {
-               BT_COMP_LOGE_ERRNO("Cannot convert timestamp to date and time",
-                       "ts=%" PRId64, (int64_t) time_seconds);
+       if (!res) {
+               BT_COMP_LOGE_APPEND_CAUSE_ERRNO(trimmer_comp->self_comp,
+                       "Cannot convert timestamp to date and time",
+                       ": ts=%" PRId64, (int64_t) time_seconds);
                ret = -1;
                goto end;
        }
@@ -908,7 +938,7 @@ end:
 }
 
 static
-bt_component_class_message_iterator_next_method_status
+bt_message_iterator_class_next_method_status
 state_set_trimmer_iterator_bounds(
                struct trimmer_iterator *trimmer_it)
 {
@@ -926,7 +956,7 @@ state_set_trimmer_iterator_bounds(
 
        while (true) {
                upstream_iter_status =
-                       bt_self_component_port_input_message_iterator_next(
+                       bt_message_iterator_next(
                                trimmer_it->upstream_iter, &msgs, &count);
                if (upstream_iter_status != BT_MESSAGE_ITERATOR_NEXT_STATUS_OK) {
                        goto end;
@@ -934,20 +964,18 @@ state_set_trimmer_iterator_bounds(
 
                for (i = 0; i < count; i++) {
                        const bt_message *msg = msgs[i];
-                       bool skip = false;
-                       int ret;
-
+                       bool has_ns_from_origin;
                        ret = get_msg_ns_from_origin(msg, &ns_from_origin,
-                               &skip);
+                               &has_ns_from_origin);
                        if (ret) {
                                goto error;
                        }
 
-                       if (skip) {
+                       if (!has_ns_from_origin) {
                                continue;
                        }
 
-                       BT_ASSERT(ns_from_origin != INT64_MIN &&
+                       BT_ASSERT_DBG(ns_from_origin != INT64_MIN &&
                                ns_from_origin != INT64_MAX);
                        put_messages(msgs, count);
                        goto found;
@@ -992,41 +1020,67 @@ end:
 }
 
 static
-bt_component_class_message_iterator_next_method_status state_seek_initially(
+bt_message_iterator_class_next_method_status state_seek_initially(
                struct trimmer_iterator *trimmer_it)
 {
        struct trimmer_comp *trimmer_comp = trimmer_it->trimmer_comp;
-       bt_component_class_message_iterator_next_method_status status =
-               BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_OK;
+       bt_message_iterator_class_next_method_status status;
 
        BT_ASSERT(trimmer_it->begin.is_set);
 
        if (trimmer_it->begin.is_infinite) {
-               if (!bt_self_component_port_input_message_iterator_can_seek_beginning(
-                               trimmer_it->upstream_iter)) {
-                       BT_COMP_LOGE_STR("Cannot make upstream message iterator initially seek its beginning.");
-                       status = BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_ERROR;
+               bt_bool can_seek;
+
+               status = (int) bt_message_iterator_can_seek_beginning(
+                       trimmer_it->upstream_iter, &can_seek);
+               if (status != BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_OK) {
+                       if (status < 0) {
+                               BT_COMP_LOGE_APPEND_CAUSE(trimmer_comp->self_comp,
+                                       "Cannot make upstream message iterator initially seek its beginning.");
+                       }
+
                        goto end;
                }
 
-               status = (int) bt_self_component_port_input_message_iterator_seek_beginning(
+               if (!can_seek) {
+                       BT_COMP_LOGE_APPEND_CAUSE(trimmer_comp->self_comp,
+                               "Cannot make upstream message iterator initially seek its beginning.");
+                       status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_ERROR;
+                       goto end;
+               }
+
+               status = (int) bt_message_iterator_seek_beginning(
                        trimmer_it->upstream_iter);
        } else {
-               if (!bt_self_component_port_input_message_iterator_can_seek_ns_from_origin(
-                               trimmer_it->upstream_iter,
-                               trimmer_it->begin.ns_from_origin)) {
-                       BT_COMP_LOGE("Cannot make upstream message iterator initially seek: "
-                               "seek-ns-from-origin=%" PRId64,
+               bt_bool can_seek;
+
+               status = (int) bt_message_iterator_can_seek_ns_from_origin(
+                       trimmer_it->upstream_iter, trimmer_it->begin.ns_from_origin,
+                       &can_seek);
+
+               if (status != BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_OK) {
+                       if (status < 0) {
+                               BT_COMP_LOGE_APPEND_CAUSE(trimmer_comp->self_comp,
+                                       "Cannot make upstream message iterator initially seek: seek-ns-from-origin=%" PRId64,
+                                       trimmer_it->begin.ns_from_origin);
+                       }
+
+                       goto end;
+               }
+
+               if (!can_seek) {
+                       BT_COMP_LOGE_APPEND_CAUSE(trimmer_comp->self_comp,
+                               "Cannot make upstream message iterator initially seek: seek-ns-from-origin=%" PRId64,
                                trimmer_it->begin.ns_from_origin);
-                       status = BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_ERROR;
+                       status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_ERROR;
                        goto end;
                }
 
-               status = (int) bt_self_component_port_input_message_iterator_seek_ns_from_origin(
+               status = (int) bt_message_iterator_seek_ns_from_origin(
                        trimmer_it->upstream_iter, trimmer_it->begin.ns_from_origin);
        }
 
-       if (status == BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_OK) {
+       if (status == BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_OK) {
                trimmer_it->state = TRIMMER_ITERATOR_STATE_TRIM;
        }
 
@@ -1062,112 +1116,81 @@ int clock_raw_value_from_ns_from_origin(const bt_clock_class *clock_class,
 }
 
 static inline
-bt_component_class_message_iterator_next_method_status
+bt_message_iterator_class_next_method_status
 end_stream(struct trimmer_iterator *trimmer_it,
                struct trimmer_iterator_stream_state *sstate)
 {
-       bt_component_class_message_iterator_next_method_status status =
-               BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_OK;
-       uint64_t raw_value;
-       const bt_clock_class *clock_class;
-       int ret;
+       bt_message_iterator_class_next_method_status status =
+               BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_OK;
+       /* Initialize to silence maybe-uninitialized warning. */
+       uint64_t raw_value = 0;
        bt_message *msg = NULL;
 
        BT_ASSERT(!trimmer_it->end.is_infinite);
+       BT_ASSERT(sstate->stream);
 
-       if (!sstate->stream) {
-               goto end;
-       }
-
-       if (sstate->cur_packet) {
-               /*
-                * The last message could not have been a stream
-                * activity end message if we have a current packet.
-                */
-               BT_ASSERT(!sstate->last_msg_is_stream_activity_end);
+       /*
+        * If we haven't seen a message with a clock snapshot, we don't know if the trimmer's end bound is within
+        * the clock's range, so it wouldn't be safe to try to convert ns_from_origin to a clock value.
+        *
+        * Also, it would be a bit of a lie to generate a stream end message with the end bound as its
+        * clock snapshot, because we don't really know if the stream existed at that time.  If we have
+        * seen a message with a clock snapshot and the stream is cut short by another message with a
+        * clock snapshot, then we are sure that the the end bound time is not below the clock range,
+        * and we know the stream was active at that time (and that we cut it short).
+        */
+       if (sstate->seen_clock_snapshot) {
+               const bt_clock_class *clock_class;
+               int ret;
 
-               /*
-                * Create and push a packet end message, making its time
-                * the trimming range's end time.
-                */
                clock_class = bt_stream_class_borrow_default_clock_class_const(
                        bt_stream_borrow_class_const(sstate->stream));
                BT_ASSERT(clock_class);
                ret = clock_raw_value_from_ns_from_origin(clock_class,
                        trimmer_it->end.ns_from_origin, &raw_value);
                if (ret) {
-                       status = BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_ERROR;
+                       status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_ERROR;
                        goto end;
                }
+       }
+
+       if (sstate->cur_packet) {
+               /*
+                * Create and push a packet end message, making its time
+                * the trimming range's end time.
+                *
+                * We know that we must have seen a clock snapshot, the one in
+                * the packet beginning message, since trimmer currently
+                * requires packet messages to have clock snapshots (see comment
+                * in create_stream_state_entry).
+                */
+               BT_ASSERT(sstate->seen_clock_snapshot);
 
                msg = bt_message_packet_end_create_with_default_clock_snapshot(
                        trimmer_it->self_msg_iter, sstate->cur_packet,
                        raw_value);
                if (!msg) {
-                       status = BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_MEMORY_ERROR;
+                       status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_MEMORY_ERROR;
                        goto end;
                }
 
                push_message(trimmer_it, msg);
                msg = NULL;
                BT_PACKET_PUT_REF_AND_RESET(sstate->cur_packet);
-
-               /*
-                * Because we generated a packet end message, set the
-                * stream activity end message's time to use to the
-                * trimming range's end time (this packet end message's
-                * time).
-                */
-               sstate->stream_act_end_ns_from_origin =
-                       trimmer_it->end.ns_from_origin;
-       }
-
-       if (!sstate->last_msg_is_stream_activity_end) {
-               /* Create and push a stream activity end message */
-               msg = bt_message_stream_activity_end_create(
-                       trimmer_it->self_msg_iter, sstate->stream);
-               if (!msg) {
-                       status = BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_MEMORY_ERROR;
-                       goto end;
-               }
-
-               clock_class = bt_stream_class_borrow_default_clock_class_const(
-                       bt_stream_borrow_class_const(sstate->stream));
-               BT_ASSERT(clock_class);
-
-               if (sstate->stream_act_end_ns_from_origin == INT64_MIN) {
-                       /*
-                        * We received at least what is necessary to
-                        * have a stream state (stream beginning and
-                        * stream activity beginning messages), but
-                        * nothing else: use the trimmer range's end
-                        * time.
-                        */
-                       sstate->stream_act_end_ns_from_origin =
-                               trimmer_it->end.ns_from_origin;
-               }
-
-               ret = clock_raw_value_from_ns_from_origin(clock_class,
-                       sstate->stream_act_end_ns_from_origin, &raw_value);
-               if (ret) {
-                       status = BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_ERROR;
-                       goto end;
-               }
-
-               bt_message_stream_activity_end_set_default_clock_snapshot(
-                       msg, raw_value);
-               push_message(trimmer_it, msg);
-               msg = NULL;
        }
 
-       /* Create and push a stream end message */
+       /* Create and push a stream end message. */
        msg = bt_message_stream_end_create(trimmer_it->self_msg_iter,
                sstate->stream);
        if (!msg) {
-               status = BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_MEMORY_ERROR;
+               status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_MEMORY_ERROR;
                goto end;
        }
 
+       if (sstate->seen_clock_snapshot) {
+               bt_message_stream_end_set_default_clock_snapshot(msg, raw_value);
+       }
+
        push_message(trimmer_it, msg);
        msg = NULL;
 
@@ -1183,11 +1206,11 @@ end:
 }
 
 static inline
-bt_component_class_message_iterator_next_method_status end_iterator_streams(
+bt_message_iterator_class_next_method_status end_iterator_streams(
                struct trimmer_iterator *trimmer_it)
 {
-       bt_component_class_message_iterator_next_method_status status =
-               BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_OK;
+       bt_message_iterator_class_next_method_status status =
+               BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_OK;
        GHashTableIter iter;
        gpointer key, sstate;
 
@@ -1220,6 +1243,138 @@ end:
        return status;
 }
 
+static
+bt_message_iterator_class_next_method_status
+create_stream_state_entry(
+               struct trimmer_iterator *trimmer_it,
+               const struct bt_stream *stream,
+               struct trimmer_iterator_stream_state **stream_state)
+{
+       struct trimmer_comp *trimmer_comp = trimmer_it->trimmer_comp;
+       bt_message_iterator_class_next_method_status status;
+       struct trimmer_iterator_stream_state *sstate;
+       const bt_stream_class *sc;
+
+       BT_ASSERT(!bt_g_hash_table_contains(trimmer_it->stream_states, stream));
+
+       /*
+        * Validate right now that the stream's class
+        * has a registered default clock class so that
+        * an existing stream state guarantees existing
+        * default clock snapshots for its associated
+        * messages.
+        *
+        * Also check that clock snapshots are always
+        * known.
+        */
+       sc = bt_stream_borrow_class_const(stream);
+       if (!bt_stream_class_borrow_default_clock_class_const(sc)) {
+               BT_COMP_LOGE_APPEND_CAUSE(trimmer_comp->self_comp,
+                       "Unsupported stream: stream class does "
+                       "not have a default clock class: "
+                       "stream-addr=%p, "
+                       "stream-id=%" PRIu64 ", "
+                       "stream-name=\"%s\"",
+                       stream, bt_stream_get_id(stream),
+                       bt_stream_get_name(stream));
+               status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_ERROR;
+               goto end;
+       }
+
+       /*
+        * Temporary: make sure packet beginning, packet
+        * end, discarded events, and discarded packets
+        * messages have default clock snapshots until
+        * the support for not having them is
+        * implemented.
+        */
+       if (bt_stream_class_supports_packets(sc)) {
+               if (!bt_stream_class_packets_have_beginning_default_clock_snapshot(
+                               sc)) {
+                       BT_COMP_LOGE_APPEND_CAUSE(trimmer_comp->self_comp,
+                               "Unsupported stream: packets have no beginning clock snapshot: "
+                               "stream-addr=%p, "
+                               "stream-id=%" PRIu64 ", "
+                               "stream-name=\"%s\"",
+                               stream, bt_stream_get_id(stream),
+                               bt_stream_get_name(stream));
+                       status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_ERROR;
+                       goto end;
+               }
+
+               if (!bt_stream_class_packets_have_end_default_clock_snapshot(
+                               sc)) {
+                       BT_COMP_LOGE_APPEND_CAUSE(trimmer_comp->self_comp,
+                               "Unsupported stream: packets have no end clock snapshot: "
+                               "stream-addr=%p, "
+                               "stream-id=%" PRIu64 ", "
+                               "stream-name=\"%s\"",
+                               stream, bt_stream_get_id(stream),
+                               bt_stream_get_name(stream));
+                       status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_ERROR;
+                       goto end;
+               }
+
+               if (bt_stream_class_supports_discarded_packets(sc) &&
+                               !bt_stream_class_discarded_packets_have_default_clock_snapshots(sc)) {
+                       BT_COMP_LOGE_APPEND_CAUSE(trimmer_comp->self_comp,
+                               "Unsupported stream: discarded packets "
+                               "have no clock snapshots: "
+                               "stream-addr=%p, "
+                               "stream-id=%" PRIu64 ", "
+                               "stream-name=\"%s\"",
+                               stream, bt_stream_get_id(stream),
+                               bt_stream_get_name(stream));
+                       status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_ERROR;
+                       goto end;
+               }
+       }
+
+       if (bt_stream_class_supports_discarded_events(sc) &&
+                       !bt_stream_class_discarded_events_have_default_clock_snapshots(sc)) {
+               BT_COMP_LOGE_APPEND_CAUSE(trimmer_comp->self_comp,
+                       "Unsupported stream: discarded events have no clock snapshots: "
+                       "stream-addr=%p, "
+                       "stream-id=%" PRIu64 ", "
+                       "stream-name=\"%s\"",
+                       stream, bt_stream_get_id(stream),
+                       bt_stream_get_name(stream));
+               status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_ERROR;
+               goto end;
+       }
+
+       sstate = g_new0(struct trimmer_iterator_stream_state, 1);
+       if (!sstate) {
+               status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_MEMORY_ERROR;
+               goto end;
+       }
+
+       sstate->stream = stream;
+
+       g_hash_table_insert(trimmer_it->stream_states, (void *) stream, sstate);
+
+       *stream_state = sstate;
+
+       status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_OK;
+
+end:
+       return status;
+}
+
+static
+struct trimmer_iterator_stream_state *get_stream_state_entry(
+               struct trimmer_iterator *trimmer_it,
+               const struct bt_stream *stream)
+{
+       struct trimmer_iterator_stream_state *sstate;
+
+       BT_ASSERT_DBG(stream);
+       sstate = g_hash_table_lookup(trimmer_it->stream_states, stream);
+       BT_ASSERT_DBG(sstate);
+
+       return sstate;
+}
+
 /*
  * Handles a message which is associated to a given stream state. This
  * _could_ make the iterator's output message queue grow; this could
@@ -1228,69 +1383,107 @@ end:
  *
  * This function consumes the `msg` reference, _whatever the outcome_.
  *
- * `ns_from_origin` is the message's time, as given by
- * get_msg_ns_from_origin().
+ * If non-NULL, `ns_from_origin` is the message's time, as given by
+ * get_msg_ns_from_origin().  If NULL, the message doesn't have a time.
  *
  * This function sets `reached_end` if handling this message made the
  * iterator reach the end of the trimming range. Note that the output
  * message queue could contain messages even if this function sets
  * `reached_end`.
  */
-static inline
-bt_component_class_message_iterator_next_method_status
-handle_message_with_stream_state(
+static
+bt_message_iterator_class_next_method_status
+handle_message_with_stream(
                struct trimmer_iterator *trimmer_it, const bt_message *msg,
-               struct trimmer_iterator_stream_state *sstate,
-               int64_t ns_from_origin, bool *reached_end)
+               const struct bt_stream *stream, const int64_t *ns_from_origin,
+               bool *reached_end)
 {
-       bt_component_class_message_iterator_next_method_status status =
-               BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_OK;
+       bt_message_iterator_class_next_method_status status =
+               BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_OK;
        bt_message_type msg_type = bt_message_get_type(msg);
        int ret;
+       struct trimmer_iterator_stream_state *sstate = NULL;
+
+       /*
+        * Retrieve the stream's state - except if the message is stream
+        * beginning, in which case we don't know about about this stream yet.
+        */
+       if (msg_type != BT_MESSAGE_TYPE_STREAM_BEGINNING) {
+               sstate = get_stream_state_entry(trimmer_it, stream);
+       }
 
        switch (msg_type) {
        case BT_MESSAGE_TYPE_EVENT:
+               /*
+                * Event messages always have a clock snapshot if the stream
+                * class has a clock class. And we know it has, otherwise we
+                * couldn't be using the trimmer component.
+                */
+               BT_ASSERT_DBG(ns_from_origin);
+
                if (G_UNLIKELY(!trimmer_it->end.is_infinite &&
-                               ns_from_origin > trimmer_it->end.ns_from_origin)) {
+                               *ns_from_origin > trimmer_it->end.ns_from_origin)) {
                        status = end_iterator_streams(trimmer_it);
                        *reached_end = true;
                        break;
                }
 
-               BT_ASSERT(sstate->cur_packet);
+               sstate->seen_clock_snapshot = true;
+
                push_message(trimmer_it, msg);
                msg = NULL;
                break;
+
        case BT_MESSAGE_TYPE_PACKET_BEGINNING:
+               /*
+                * Packet beginning messages won't have a clock snapshot if
+                * stream_class->packets_have_beginning_default_clock_snapshot
+                * is false.  But for now, assume they always do.
+                */
+               BT_ASSERT(ns_from_origin);
+               BT_ASSERT(!sstate->cur_packet);
+
                if (G_UNLIKELY(!trimmer_it->end.is_infinite &&
-                               ns_from_origin > trimmer_it->end.ns_from_origin)) {
+                               *ns_from_origin > trimmer_it->end.ns_from_origin)) {
                        status = end_iterator_streams(trimmer_it);
                        *reached_end = true;
                        break;
                }
 
-               BT_ASSERT(!sstate->cur_packet);
                sstate->cur_packet =
                        bt_message_packet_beginning_borrow_packet_const(msg);
                bt_packet_get_ref(sstate->cur_packet);
+
+               sstate->seen_clock_snapshot = true;
+
                push_message(trimmer_it, msg);
                msg = NULL;
                break;
+
        case BT_MESSAGE_TYPE_PACKET_END:
-               sstate->stream_act_end_ns_from_origin = ns_from_origin;
+               /*
+                * Packet end messages won't have a clock snapshot if
+                * stream_class->packets_have_end_default_clock_snapshot
+                * is false.  But for now, assume they always do.
+                */
+               BT_ASSERT(ns_from_origin);
+               BT_ASSERT(sstate->cur_packet);
 
                if (G_UNLIKELY(!trimmer_it->end.is_infinite &&
-                               ns_from_origin > trimmer_it->end.ns_from_origin)) {
+                               *ns_from_origin > trimmer_it->end.ns_from_origin)) {
                        status = end_iterator_streams(trimmer_it);
                        *reached_end = true;
                        break;
                }
 
-               BT_ASSERT(sstate->cur_packet);
                BT_PACKET_PUT_REF_AND_RESET(sstate->cur_packet);
+
+               sstate->seen_clock_snapshot = true;
+
                push_message(trimmer_it, msg);
                msg = NULL;
                break;
+
        case BT_MESSAGE_TYPE_DISCARDED_EVENTS:
        case BT_MESSAGE_TYPE_DISCARDED_PACKETS:
        {
@@ -1301,6 +1494,10 @@ handle_message_with_stream_state(
                int64_t end_ns_from_origin;
                const bt_clock_snapshot *end_cs;
 
+               BT_ASSERT(ns_from_origin);
+
+               sstate->seen_clock_snapshot = true;
+
                if (bt_message_get_type(msg) ==
                                BT_MESSAGE_TYPE_DISCARDED_EVENTS) {
                        /*
@@ -1322,14 +1519,12 @@ handle_message_with_stream_state(
 
                if (bt_clock_snapshot_get_ns_from_origin(end_cs,
                                &end_ns_from_origin)) {
-                       status = BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_ERROR;
+                       status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_ERROR;
                        goto end;
                }
 
-               sstate->stream_act_end_ns_from_origin = end_ns_from_origin;
-
                if (!trimmer_it->end.is_infinite &&
-                               ns_from_origin > trimmer_it->end.ns_from_origin) {
+                               *ns_from_origin > trimmer_it->end.ns_from_origin) {
                        status = end_iterator_streams(trimmer_it);
                        *reached_end = true;
                        break;
@@ -1354,7 +1549,7 @@ handle_message_with_stream_state(
                        ret = clock_raw_value_from_ns_from_origin(clock_class,
                                trimmer_it->end.ns_from_origin, &end_raw_value);
                        if (ret) {
-                               status = BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_ERROR;
+                               status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_ERROR;
                                goto end;
                        }
 
@@ -1377,7 +1572,7 @@ handle_message_with_stream_state(
                        }
 
                        if (!new_msg) {
-                               status = BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_MEMORY_ERROR;
+                               status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_MEMORY_ERROR;
                                goto end;
                        }
 
@@ -1389,87 +1584,60 @@ handle_message_with_stream_state(
                msg = NULL;
                break;
        }
-       case BT_MESSAGE_TYPE_STREAM_ACTIVITY_BEGINNING:
-               if (!trimmer_it->end.is_infinite &&
-                               ns_from_origin > trimmer_it->end.ns_from_origin) {
-                       /*
-                        * This only happens when the message's time is
-                        * known and is greater than the trimming
-                        * range's end time. Unknown and -inf times are
-                        * always less than
-                        * `trimmer_it->end.ns_from_origin`.
-                        */
+
+       case BT_MESSAGE_TYPE_STREAM_BEGINNING:
+               /*
+                * If this message has a time and this time is greater than the
+                * trimmer's end bound, it triggers the end of the trim window.
+                */
+               if (G_UNLIKELY(ns_from_origin && !trimmer_it->end.is_infinite &&
+                               *ns_from_origin > trimmer_it->end.ns_from_origin)) {
                        status = end_iterator_streams(trimmer_it);
                        *reached_end = true;
                        break;
                }
 
-               push_message(trimmer_it, msg);
-               msg = NULL;
-               break;
-       case BT_MESSAGE_TYPE_STREAM_ACTIVITY_END:
-               if (trimmer_it->end.is_infinite) {
-                       push_message(trimmer_it, msg);
-                       msg = NULL;
-                       break;
+               /* Learn about this stream. */
+               status = create_stream_state_entry(trimmer_it, stream, &sstate);
+               if (status != BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_OK) {
+                       goto end;
                }
 
-               if (ns_from_origin == INT64_MIN) {
-                       /* Unknown: consider it to be in the trimmer window. */
-                       push_message(trimmer_it, msg);
-                       msg = NULL;
-                       sstate->last_msg_is_stream_activity_end = true;
-               } else if (ns_from_origin == INT64_MAX) {
-                       /* Infinite: use trimming range's end time */
-                       sstate->stream_act_end_ns_from_origin =
-                               trimmer_it->end.ns_from_origin;
-               } else {
-                       /* Known: check if outside of trimming range */
-                       if (ns_from_origin > trimmer_it->end.ns_from_origin) {
-                               sstate->stream_act_end_ns_from_origin =
-                                       trimmer_it->end.ns_from_origin;
-                               status = end_iterator_streams(trimmer_it);
-                               *reached_end = true;
-                               break;
-                       }
-
-                       push_message(trimmer_it, msg);
-                       msg = NULL;
-                       sstate->last_msg_is_stream_activity_end = true;
-                       sstate->stream_act_end_ns_from_origin = ns_from_origin;
+               if (ns_from_origin) {
+                       sstate->seen_clock_snapshot = true;
                }
 
-               break;
-       case BT_MESSAGE_TYPE_STREAM_BEGINNING:
                push_message(trimmer_it,  msg);
                msg = NULL;
                break;
        case BT_MESSAGE_TYPE_STREAM_END:
+       {
+               gboolean removed;
+
                /*
-                * This is the end of a stream: end this
-                * stream if its stream activity end message
-                * time is not the trimming range's end time
-                * (which means the final stream activity end
-                * message had an infinite time). end_stream()
-                * will generate its own stream end message.
+                * If this message has a time and this time is greater than the
+                * trimmer's end bound, it triggers the end of the trim window.
                 */
-               if (trimmer_it->end.is_infinite) {
-                       push_message(trimmer_it, msg);
-                       msg = NULL;
+               if (G_UNLIKELY(ns_from_origin && !trimmer_it->end.is_infinite &&
+                               *ns_from_origin > trimmer_it->end.ns_from_origin)) {
+                       status = end_iterator_streams(trimmer_it);
+                       *reached_end = true;
+                       break;
+               }
 
-                       /* We won't need this stream state again */
-                       g_hash_table_remove(trimmer_it->stream_states, sstate->stream);
-               } else if (sstate->stream_act_end_ns_from_origin <
-                               trimmer_it->end.ns_from_origin) {
-                       status = end_stream(trimmer_it, sstate);
-                       if (status != BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_OK) {
-                               goto end;
-                       }
+               /*
+                * Either the stream end message's time is within the trimmer's
+                * bounds, or it doesn't have a time.  In both cases, pass
+                * the message unmodified.
+                */
+               push_message(trimmer_it, msg);
+               msg = NULL;
 
-                       /* We won't need this stream state again */
-                       g_hash_table_remove(trimmer_it->stream_states, sstate->stream);
-               }
+               /* Forget about this stream. */
+               removed = g_hash_table_remove(trimmer_it->stream_states, sstate->stream);
+               BT_ASSERT(removed);
                break;
+       }
        default:
                break;
        }
@@ -1477,7 +1645,7 @@ handle_message_with_stream_state(
 end:
        /* We release the message's reference whatever the outcome */
        bt_message_put_ref(msg);
-       return BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_OK;
+       return status;
 }
 
 /*
@@ -1493,17 +1661,15 @@ end:
  * `reached_end`.
  */
 static inline
-bt_component_class_message_iterator_next_method_status handle_message(
+bt_message_iterator_class_next_method_status handle_message(
                struct trimmer_iterator *trimmer_it, const bt_message *msg,
                bool *reached_end)
 {
-       bt_component_class_message_iterator_next_method_status status;
+       bt_message_iterator_class_next_method_status status;
        const bt_stream *stream = NULL;
        int64_t ns_from_origin = INT64_MIN;
-       bool skip;
+       bool has_ns_from_origin = false;
        int ret;
-       struct trimmer_iterator_stream_state *sstate = NULL;
-       struct trimmer_comp *trimmer_comp = trimmer_it->trimmer_comp;
 
        /* Find message's associated stream */
        switch (bt_message_get_type(msg)) {
@@ -1525,12 +1691,6 @@ bt_component_class_message_iterator_next_method_status handle_message(
        case BT_MESSAGE_TYPE_DISCARDED_PACKETS:
                stream = bt_message_discarded_packets_borrow_stream_const(msg);
                break;
-       case BT_MESSAGE_TYPE_STREAM_ACTIVITY_BEGINNING:
-               stream = bt_message_stream_activity_beginning_borrow_stream_const(msg);
-               break;
-       case BT_MESSAGE_TYPE_STREAM_ACTIVITY_END:
-               stream = bt_message_stream_activity_end_borrow_stream_const(msg);
-               break;
        case BT_MESSAGE_TYPE_STREAM_BEGINNING:
                stream = bt_message_stream_beginning_borrow_stream_const(msg);
                break;
@@ -1541,121 +1701,17 @@ bt_component_class_message_iterator_next_method_status handle_message(
                break;
        }
 
-       if (G_LIKELY(stream)) {
-               /* Find stream state */
-               sstate = g_hash_table_lookup(trimmer_it->stream_states,
-                       stream);
-               if (G_UNLIKELY(!sstate)) {
-                       /* No stream state yet: create one now */
-                       const bt_stream_class *sc;
-
-                       /*
-                        * Validate right now that the stream's class
-                        * has a registered default clock class so that
-                        * an existing stream state guarantees existing
-                        * default clock snapshots for its associated
-                        * messages.
-                        *
-                        * Also check that clock snapshots are always
-                        * known.
-                        */
-                       sc = bt_stream_borrow_class_const(stream);
-                       if (!bt_stream_class_borrow_default_clock_class_const(sc)) {
-                               BT_COMP_LOGE("Unsupported stream: stream class does "
-                                       "not have a default clock class: "
-                                       "stream-addr=%p, "
-                                       "stream-id=%" PRIu64 ", "
-                                       "stream-name=\"%s\"",
-                                       stream, bt_stream_get_id(stream),
-                                       bt_stream_get_name(stream));
-                               status = BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_ERROR;
-                               goto end;
-                       }
-
-                       /*
-                        * Temporary: make sure packet beginning, packet
-                        * end, discarded events, and discarded packets
-                        * messages have default clock snapshots until
-                        * the support for not having them is
-                        * implemented.
-                        */
-                       if (!bt_stream_class_packets_have_beginning_default_clock_snapshot(
-                                       sc)) {
-                               BT_COMP_LOGE("Unsupported stream: packets have "
-                                       "no beginning clock snapshot: "
-                                       "stream-addr=%p, "
-                                       "stream-id=%" PRIu64 ", "
-                                       "stream-name=\"%s\"",
-                                       stream, bt_stream_get_id(stream),
-                                       bt_stream_get_name(stream));
-                               status = BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_ERROR;
-                               goto end;
-                       }
-
-                       if (!bt_stream_class_packets_have_end_default_clock_snapshot(
-                                       sc)) {
-                               BT_COMP_LOGE("Unsupported stream: packets have "
-                                       "no end clock snapshot: "
-                                       "stream-addr=%p, "
-                                       "stream-id=%" PRIu64 ", "
-                                       "stream-name=\"%s\"",
-                                       stream, bt_stream_get_id(stream),
-                                       bt_stream_get_name(stream));
-                               status = BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_ERROR;
-                               goto end;
-                       }
-
-                       if (bt_stream_class_supports_discarded_events(sc) &&
-                                       !bt_stream_class_discarded_events_have_default_clock_snapshots(sc)) {
-                               BT_COMP_LOGE("Unsupported stream: discarded events "
-                                       "have no clock snapshots: "
-                                       "stream-addr=%p, "
-                                       "stream-id=%" PRIu64 ", "
-                                       "stream-name=\"%s\"",
-                                       stream, bt_stream_get_id(stream),
-                                       bt_stream_get_name(stream));
-                               status = BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_ERROR;
-                               goto end;
-                       }
-
-                       if (bt_stream_class_supports_discarded_packets(sc) &&
-                                       !bt_stream_class_discarded_packets_have_default_clock_snapshots(sc)) {
-                               BT_COMP_LOGE("Unsupported stream: discarded packets "
-                                       "have no clock snapshots: "
-                                       "stream-addr=%p, "
-                                       "stream-id=%" PRIu64 ", "
-                                       "stream-name=\"%s\"",
-                                       stream, bt_stream_get_id(stream),
-                                       bt_stream_get_name(stream));
-                               status = BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_ERROR;
-                               goto end;
-                       }
-
-                       sstate = g_new0(struct trimmer_iterator_stream_state,
-                               1);
-                       if (!sstate) {
-                               status = BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_MEMORY_ERROR;
-                               goto end;
-                       }
-
-                       sstate->stream = stream;
-                       sstate->stream_act_end_ns_from_origin = INT64_MIN;
-                       g_hash_table_insert(trimmer_it->stream_states,
-                               (void *) stream, sstate);
-               }
-       }
-
        /* Retrieve the message's time */
-       ret = get_msg_ns_from_origin(msg, &ns_from_origin, &skip);
+       ret = get_msg_ns_from_origin(msg, &ns_from_origin, &has_ns_from_origin);
        if (G_UNLIKELY(ret)) {
-               status = BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_ERROR;
+               status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_ERROR;
                goto end;
        }
 
-       if (G_LIKELY(sstate)) {
+       if (G_LIKELY(stream)) {
                /* Message associated to a stream */
-               status = handle_message_with_stream_state(trimmer_it, msg,
-                       sstate, ns_from_origin, reached_end);
+               status = handle_message_with_stream(trimmer_it, msg,
+                       stream, has_ns_from_origin ? &ns_from_origin : NULL, reached_end);
 
                /*
                 * handle_message_with_stream_state() unconditionally
@@ -1673,7 +1729,7 @@ bt_component_class_message_iterator_next_method_status handle_message(
                        *reached_end = true;
                } else {
                        push_message(trimmer_it, msg);
-                       status = BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_OK;
+                       status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_OK;
                        msg = NULL;
                }
        }
@@ -1701,21 +1757,21 @@ void fill_message_array_from_output_messages(
                (*count)++;
        }
 
-       BT_ASSERT(*count > 0);
+       BT_ASSERT_DBG(*count > 0);
 }
 
 static inline
-bt_component_class_message_iterator_next_method_status state_ending(
+bt_message_iterator_class_next_method_status state_ending(
                struct trimmer_iterator *trimmer_it,
                bt_message_array_const msgs, uint64_t capacity,
                uint64_t *count)
 {
-       bt_component_class_message_iterator_next_method_status status =
-               BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_OK;
+       bt_message_iterator_class_next_method_status status =
+               BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_OK;
 
        if (g_queue_is_empty(trimmer_it->output_messages)) {
                trimmer_it->state = TRIMMER_ITERATOR_STATE_ENDED;
-               status = BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_END;
+               status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_END;
                goto end;
        }
 
@@ -1727,25 +1783,25 @@ end:
 }
 
 static inline
-bt_component_class_message_iterator_next_method_status
+bt_message_iterator_class_next_method_status
 state_trim(struct trimmer_iterator *trimmer_it,
                bt_message_array_const msgs, uint64_t capacity,
                uint64_t *count)
 {
-       bt_component_class_message_iterator_next_method_status status =
-               BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_OK;
+       bt_message_iterator_class_next_method_status status =
+               BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_OK;
        bt_message_array_const my_msgs;
        uint64_t my_count;
        uint64_t i;
        bool reached_end = false;
 
        while (g_queue_is_empty(trimmer_it->output_messages)) {
-               status = (int) bt_self_component_port_input_message_iterator_next(
+               status = (int) bt_message_iterator_next(
                        trimmer_it->upstream_iter, &my_msgs, &my_count);
-               if (G_UNLIKELY(status != BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_OK)) {
-                       if (status == BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_END) {
+               if (G_UNLIKELY(status != BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_OK)) {
+                       if (status == BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_END) {
                                status = end_iterator_streams(trimmer_it);
-                               if (status != BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_OK) {
+                               if (status != BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_OK) {
                                        goto end;
                                }
 
@@ -1758,7 +1814,7 @@ state_trim(struct trimmer_iterator *trimmer_it,
                        goto end;
                }
 
-               BT_ASSERT(my_count > 0);
+               BT_ASSERT_DBG(my_count > 0);
 
                for (i = 0; i < my_count; i++) {
                        status = handle_message(trimmer_it, my_msgs[i],
@@ -1771,7 +1827,7 @@ state_trim(struct trimmer_iterator *trimmer_it,
                        my_msgs[i] = NULL;
 
                        if (G_UNLIKELY(status !=
-                                       BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_OK)) {
+                                       BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_OK)) {
                                put_messages(my_msgs, my_count);
                                goto end;
                        }
@@ -1801,7 +1857,7 @@ state_trim(struct trimmer_iterator *trimmer_it,
         * There's at least one message in the output message queue:
         * move the messages to the output message array.
         */
-       BT_ASSERT(!g_queue_is_empty(trimmer_it->output_messages));
+       BT_ASSERT_DBG(!g_queue_is_empty(trimmer_it->output_messages));
        fill_message_array_from_output_messages(trimmer_it, msgs,
                capacity, count);
 
@@ -1810,50 +1866,50 @@ end:
 }
 
 BT_HIDDEN
-bt_component_class_message_iterator_next_method_status trimmer_msg_iter_next(
+bt_message_iterator_class_next_method_status trimmer_msg_iter_next(
                bt_self_message_iterator *self_msg_iter,
                bt_message_array_const msgs, uint64_t capacity,
                uint64_t *count)
 {
        struct trimmer_iterator *trimmer_it =
                bt_self_message_iterator_get_data(self_msg_iter);
-       bt_component_class_message_iterator_next_method_status status =
-               BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_OK;
+       bt_message_iterator_class_next_method_status status =
+               BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_OK;
 
-       BT_ASSERT(trimmer_it);
+       BT_ASSERT_DBG(trimmer_it);
 
        if (G_LIKELY(trimmer_it->state == TRIMMER_ITERATOR_STATE_TRIM)) {
                status = state_trim(trimmer_it, msgs, capacity, count);
-               if (status != BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_OK) {
+               if (status != BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_OK) {
                        goto end;
                }
        } else {
                switch (trimmer_it->state) {
                case TRIMMER_ITERATOR_STATE_SET_BOUNDS_NS_FROM_ORIGIN:
                        status = state_set_trimmer_iterator_bounds(trimmer_it);
-                       if (status != BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_OK) {
+                       if (status != BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_OK) {
                                goto end;
                        }
 
                        status = state_seek_initially(trimmer_it);
-                       if (status != BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_OK) {
+                       if (status != BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_OK) {
                                goto end;
                        }
 
                        status = state_trim(trimmer_it, msgs, capacity, count);
-                       if (status != BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_OK) {
+                       if (status != BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_OK) {
                                goto end;
                        }
 
                        break;
                case TRIMMER_ITERATOR_STATE_SEEK_INITIALLY:
                        status = state_seek_initially(trimmer_it);
-                       if (status != BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_OK) {
+                       if (status != BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_OK) {
                                goto end;
                        }
 
                        status = state_trim(trimmer_it, msgs, capacity, count);
-                       if (status != BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_OK) {
+                       if (status != BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_OK) {
                                goto end;
                        }
 
@@ -1861,16 +1917,16 @@ bt_component_class_message_iterator_next_method_status trimmer_msg_iter_next(
                case TRIMMER_ITERATOR_STATE_ENDING:
                        status = state_ending(trimmer_it, msgs, capacity,
                                count);
-                       if (status != BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_OK) {
+                       if (status != BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_OK) {
                                goto end;
                        }
 
                        break;
                case TRIMMER_ITERATOR_STATE_ENDED:
-                       status = BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_END;
+                       status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_END;
                        break;
                default:
-                       abort();
+                       bt_common_abort();
                }
        }
 
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