| /* |
| * 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_fax.h" |
| |
| #include <assert.h> |
| |
| #include <algorithm> |
| |
| #include "webrtc/modules/audio_coding/neteq/decoder_database.h" |
| #include "webrtc/modules/audio_coding/neteq/sync_buffer.h" |
| |
| namespace webrtc { |
| |
| Operations DecisionLogicFax::GetDecisionSpecialized( |
| 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, |
| size_t generated_noise_samples) { |
| assert(playout_mode_ == kPlayoutFax || playout_mode_ == kPlayoutOff); |
| uint32_t target_timestamp = sync_buffer.end_timestamp(); |
| uint32_t available_timestamp = 0; |
| int is_cng_packet = 0; |
| if (packet_header) { |
| available_timestamp = packet_header->timestamp; |
| is_cng_packet = |
| decoder_database_->IsComfortNoise(packet_header->payloadType); |
| } |
| if (is_cng_packet) { |
| if (static_cast<int32_t>((generated_noise_samples + target_timestamp) |
| - available_timestamp) >= 0) { |
| // Time to play this packet now. |
| return kRfc3389Cng; |
| } else { |
| // Wait before playing this packet. |
| return kRfc3389CngNoPacket; |
| } |
| } |
| if (!packet_header) { |
| // No packet. If in CNG mode, play as usual. Otherwise, use other method to |
| // generate data. |
| if (cng_state_ == kCngRfc3389On) { |
| // Continue playing comfort noise. |
| return kRfc3389CngNoPacket; |
| } else if (cng_state_ == kCngInternalOn) { |
| // Continue playing codec-internal comfort noise. |
| return kCodecInternalCng; |
| } else { |
| // Nothing to play. Generate some data to play out. |
| switch (playout_mode_) { |
| case kPlayoutOff: |
| return kAlternativePlc; |
| case kPlayoutFax: |
| return kAudioRepetition; |
| default: |
| assert(false); |
| return kUndefined; |
| } |
| } |
| } else if (target_timestamp == available_timestamp) { |
| return kNormal; |
| } else { |
| if (static_cast<int32_t>((generated_noise_samples + target_timestamp) |
| - available_timestamp) >= 0) { |
| return kNormal; |
| } else { |
| // If currently playing comfort noise, continue with that. Do not |
| // increase the timestamp counter since generated_noise_stopwatch_ in |
| // NetEqImpl will take care of the time-keeping. |
| if (cng_state_ == kCngRfc3389On) { |
| return kRfc3389CngNoPacket; |
| } else if (cng_state_ == kCngInternalOn) { |
| return kCodecInternalCng; |
| } else { |
| // Otherwise, do packet-loss concealment and increase the |
| // timestamp while waiting for the time to play this packet. |
| switch (playout_mode_) { |
| case kPlayoutOff: |
| return kAlternativePlcIncreaseTimestamp; |
| case kPlayoutFax: |
| return kAudioRepetitionIncreaseTimestamp; |
| default: |
| assert(0); |
| return kUndefined; |
| } |
| } |
| } |
| } |
| } |
| |
| |
| } // namespace webrtc |