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103 lines
3.2 KiB
C++
103 lines
3.2 KiB
C++
/*
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* Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "webrtc/modules/audio_coding/neteq/decision_logic_fax.h"
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#include <assert.h>
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#include <algorithm>
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#include "webrtc/modules/audio_coding/neteq/decoder_database.h"
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#include "webrtc/modules/audio_coding/neteq/sync_buffer.h"
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namespace webrtc {
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Operations DecisionLogicFax::GetDecisionSpecialized(
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const SyncBuffer& sync_buffer,
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const Expand& expand,
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int decoder_frame_length,
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const RTPHeader* packet_header,
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Modes prev_mode,
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bool play_dtmf,
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bool* reset_decoder) {
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assert(playout_mode_ == kPlayoutFax || playout_mode_ == kPlayoutOff);
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uint32_t target_timestamp = sync_buffer.end_timestamp();
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uint32_t available_timestamp = 0;
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int is_cng_packet = 0;
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if (packet_header) {
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available_timestamp = packet_header->timestamp;
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is_cng_packet =
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decoder_database_->IsComfortNoise(packet_header->payloadType);
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}
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if (is_cng_packet) {
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if (static_cast<int32_t>((generated_noise_samples_ + target_timestamp)
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- available_timestamp) >= 0) {
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// Time to play this packet now.
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return kRfc3389Cng;
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} else {
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// Wait before playing this packet.
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return kRfc3389CngNoPacket;
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}
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}
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if (!packet_header) {
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// No packet. If in CNG mode, play as usual. Otherwise, use other method to
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// generate data.
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if (cng_state_ == kCngRfc3389On) {
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// Continue playing comfort noise.
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return kRfc3389CngNoPacket;
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} else if (cng_state_ == kCngInternalOn) {
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// Continue playing codec-internal comfort noise.
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return kCodecInternalCng;
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} else {
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// Nothing to play. Generate some data to play out.
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switch (playout_mode_) {
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case kPlayoutOff:
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return kAlternativePlc;
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case kPlayoutFax:
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return kAudioRepetition;
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default:
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assert(false);
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return kUndefined;
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}
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}
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} else if (target_timestamp == available_timestamp) {
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return kNormal;
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} else {
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if (static_cast<int32_t>((generated_noise_samples_ + target_timestamp)
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- available_timestamp) >= 0) {
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return kNormal;
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} else {
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// If currently playing comfort noise, continue with that. Do not
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// increase the timestamp counter since generated_noise_samples_ will
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// be increased.
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if (cng_state_ == kCngRfc3389On) {
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return kRfc3389CngNoPacket;
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} else if (cng_state_ == kCngInternalOn) {
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return kCodecInternalCng;
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} else {
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// Otherwise, do packet-loss concealment and increase the
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// timestamp while waiting for the time to play this packet.
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switch (playout_mode_) {
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case kPlayoutOff:
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return kAlternativePlcIncreaseTimestamp;
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case kPlayoutFax:
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return kAudioRepetitionIncreaseTimestamp;
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default:
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assert(0);
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return kUndefined;
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}
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}
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}
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}
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}
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} // namespace webrtc
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