1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
|
/*
* Copyright (c) 2013 The WebRTC 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 "webrtc/modules/audio_coding/neteq/decision_logic.h"
#include <algorithm>
#include "webrtc/modules/audio_coding/neteq/buffer_level_filter.h"
#include "webrtc/modules/audio_coding/neteq/decision_logic_fax.h"
#include "webrtc/modules/audio_coding/neteq/decision_logic_normal.h"
#include "webrtc/modules/audio_coding/neteq/delay_manager.h"
#include "webrtc/modules/audio_coding/neteq/expand.h"
#include "webrtc/modules/audio_coding/neteq/packet_buffer.h"
#include "webrtc/modules/audio_coding/neteq/sync_buffer.h"
#include "webrtc/system_wrappers/include/logging.h"
namespace webrtc {
DecisionLogic* DecisionLogic::Create(int fs_hz,
size_t output_size_samples,
NetEqPlayoutMode playout_mode,
DecoderDatabase* decoder_database,
const PacketBuffer& packet_buffer,
DelayManager* delay_manager,
BufferLevelFilter* buffer_level_filter) {
switch (playout_mode) {
case kPlayoutOn:
case kPlayoutStreaming:
return new DecisionLogicNormal(fs_hz,
output_size_samples,
playout_mode,
decoder_database,
packet_buffer,
delay_manager,
buffer_level_filter);
case kPlayoutFax:
case kPlayoutOff:
return new DecisionLogicFax(fs_hz,
output_size_samples,
playout_mode,
decoder_database,
packet_buffer,
delay_manager,
buffer_level_filter);
}
// This line cannot be reached, but must be here to avoid compiler errors.
assert(false);
return NULL;
}
DecisionLogic::DecisionLogic(int fs_hz,
size_t output_size_samples,
NetEqPlayoutMode playout_mode,
DecoderDatabase* decoder_database,
const PacketBuffer& packet_buffer,
DelayManager* delay_manager,
BufferLevelFilter* buffer_level_filter)
: decoder_database_(decoder_database),
packet_buffer_(packet_buffer),
delay_manager_(delay_manager),
buffer_level_filter_(buffer_level_filter),
cng_state_(kCngOff),
generated_noise_samples_(0),
packet_length_samples_(0),
sample_memory_(0),
prev_time_scale_(false),
timescale_hold_off_(kMinTimescaleInterval),
num_consecutive_expands_(0),
playout_mode_(playout_mode) {
delay_manager_->set_streaming_mode(playout_mode_ == kPlayoutStreaming);
SetSampleRate(fs_hz, output_size_samples);
}
void DecisionLogic::Reset() {
cng_state_ = kCngOff;
generated_noise_samples_ = 0;
packet_length_samples_ = 0;
sample_memory_ = 0;
prev_time_scale_ = false;
timescale_hold_off_ = 0;
num_consecutive_expands_ = 0;
}
void DecisionLogic::SoftReset() {
packet_length_samples_ = 0;
sample_memory_ = 0;
prev_time_scale_ = false;
timescale_hold_off_ = kMinTimescaleInterval;
}
void DecisionLogic::SetSampleRate(int fs_hz, size_t output_size_samples) {
// TODO(hlundin): Change to an enumerator and skip assert.
assert(fs_hz == 8000 || fs_hz == 16000 || fs_hz == 32000 || fs_hz == 48000);
fs_mult_ = fs_hz / 8000;
output_size_samples_ = output_size_samples;
}
Operations DecisionLogic::GetDecision(const SyncBuffer& sync_buffer,
const Expand& expand,
size_t decoder_frame_length,
const RTPHeader* packet_header,
Modes prev_mode,
bool play_dtmf, bool* reset_decoder) {
if (prev_mode == kModeRfc3389Cng ||
prev_mode == kModeCodecInternalCng ||
prev_mode == kModeExpand) {
// If last mode was CNG (or Expand, since this could be covering up for
// a lost CNG packet), increase the |generated_noise_samples_| counter.
generated_noise_samples_ += output_size_samples_;
// Remember that CNG is on. This is needed if comfort noise is interrupted
// by DTMF.
if (prev_mode == kModeRfc3389Cng) {
cng_state_ = kCngRfc3389On;
} else if (prev_mode == kModeCodecInternalCng) {
cng_state_ = kCngInternalOn;
}
}
const size_t samples_left =
sync_buffer.FutureLength() - expand.overlap_length();
const size_t cur_size_samples =
samples_left + packet_buffer_.NumSamplesInBuffer(decoder_database_,
decoder_frame_length);
prev_time_scale_ = prev_time_scale_ &&
(prev_mode == kModeAccelerateSuccess ||
prev_mode == kModeAccelerateLowEnergy ||
prev_mode == kModePreemptiveExpandSuccess ||
prev_mode == kModePreemptiveExpandLowEnergy);
FilterBufferLevel(cur_size_samples, prev_mode);
return GetDecisionSpecialized(sync_buffer, expand, decoder_frame_length,
packet_header, prev_mode, play_dtmf,
reset_decoder);
}
void DecisionLogic::ExpandDecision(Operations operation) {
if (operation == kExpand) {
num_consecutive_expands_++;
} else {
num_consecutive_expands_ = 0;
}
}
void DecisionLogic::FilterBufferLevel(size_t buffer_size_samples,
Modes prev_mode) {
const int elapsed_time_ms =
static_cast<int>(output_size_samples_ / (8 * fs_mult_));
delay_manager_->UpdateCounters(elapsed_time_ms);
// Do not update buffer history if currently playing CNG since it will bias
// the filtered buffer level.
if ((prev_mode != kModeRfc3389Cng) && (prev_mode != kModeCodecInternalCng)) {
buffer_level_filter_->SetTargetBufferLevel(
delay_manager_->base_target_level());
size_t buffer_size_packets = 0;
if (packet_length_samples_ > 0) {
// Calculate size in packets.
buffer_size_packets = buffer_size_samples / packet_length_samples_;
}
int sample_memory_local = 0;
if (prev_time_scale_) {
sample_memory_local = sample_memory_;
timescale_hold_off_ = kMinTimescaleInterval;
}
buffer_level_filter_->Update(buffer_size_packets, sample_memory_local,
packet_length_samples_);
prev_time_scale_ = false;
}
timescale_hold_off_ = std::max(timescale_hold_off_ - 1, 0);
}
} // namespace webrtc
|
