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Avoid NACKing after DTX.

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This is done by not adding missing packets to the NACK list if the number of samples per packet is too large.

Bug: webrtc:10178
Change-Id: If46398d6d05ea35f30d7028040d3b808559e950b
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/231841
Reviewed-by: Ivo Creusen <ivoc@webrtc.org>
Commit-Queue: Jakob Ivarsson <jakobi@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#34984}
This commit is contained in:
Jakob Ivarsson
2021-09-13 16:06:28 +02:00
committed by WebRTC LUCI CQ
parent 593b4d550d
commit 018cd3d6fc
3 changed files with 53 additions and 27 deletions
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23
modules/audio_coding/neteq/nack_tracker.h
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@ -17,6 +17,7 @@
#include <map>
#include <vector>
#include "absl/types/optional.h"
#include "modules/include/module_common_types_public.h"
#include "rtc_base/gtest_prod_util.h"
@ -159,22 +160,24 @@ class NackTracker {
// Given the `sequence_number_current_received_rtp` of currently received RTP,
// recognize packets which are not arrive and add to the list.
void AddToList(uint16_t sequence_number_current_received_rtp);
void AddToList(uint16_t sequence_number_current_received_rtp,
uint32_t timestamp_current_received_rtp);
// This function subtracts 10 ms of time-to-play for all packets in NACK list.
// This is called when 10 ms elapsed with no new RTP packet decoded.
void UpdateEstimatedPlayoutTimeBy10ms();
// Given the `sequence_number_current_received_rtp` and
// `timestamp_current_received_rtp` of currently received RTP update number
// of samples per packet.
void UpdateSamplesPerPacket(uint16_t sequence_number_current_received_rtp,
uint32_t timestamp_current_received_rtp);
// Returns a valid number of samples per packet given the current received
// sequence number and timestamp or nullopt of none could be computed.
absl::optional<int> GetSamplesPerPacket(
uint16_t sequence_number_current_received_rtp,
uint32_t timestamp_current_received_rtp) const;
// Given the `sequence_number_current_received_rtp` of currently received RTP
// update the list. That is; some packets will change from late to missing,
// some packets are inserted as missing and some inserted as late.
void UpdateList(uint16_t sequence_number_current_received_rtp);
void UpdateList(uint16_t sequence_number_current_received_rtp,
uint32_t timestamp_current_received_rtp);
// Packets which are considered late for too long (according to
// `nack_threshold_packets_`) are flagged as missing.
@ -186,7 +189,7 @@ class NackTracker {
void LimitNackListSize();
// Estimate timestamp of a missing packet given its sequence number.
uint32_t EstimateTimestamp(uint16_t sequence_number);
uint32_t EstimateTimestamp(uint16_t sequence_number, int samples_per_packet);
// Compute time-to-play given a timestamp.
int64_t TimeToPlay(uint32_t timestamp) const;
@ -215,10 +218,6 @@ class NackTracker {
int sample_rate_khz_; // Sample rate in kHz.
// Number of samples per packet. We update this every time we receive a
// packet, not only for consecutive packets.
int samples_per_packet_;
// A list of missing packets to be retransmitted. Components of the list
// contain the sequence number of missing packets and the estimated time that
// each pack is going to be played out.