| /* |
| * Copyright (c) 2014 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/tools/constant_pcm_packet_source.h" |
| |
| #include <algorithm> |
| |
| #include "webrtc/base/checks.h" |
| #include "webrtc/modules/audio_coding/codecs/pcm16b/pcm16b.h" |
| #include "webrtc/modules/audio_coding/neteq/tools/packet.h" |
| |
| namespace webrtc { |
| namespace test { |
| |
| ConstantPcmPacketSource::ConstantPcmPacketSource(size_t payload_len_samples, |
| int16_t sample_value, |
| int sample_rate_hz, |
| int payload_type) |
| : payload_len_samples_(payload_len_samples), |
| packet_len_bytes_(2 * payload_len_samples_ + kHeaderLenBytes), |
| samples_per_ms_(sample_rate_hz / 1000), |
| next_arrival_time_ms_(0.0), |
| payload_type_(payload_type), |
| seq_number_(0), |
| timestamp_(0), |
| payload_ssrc_(0xABCD1234) { |
| size_t encoded_len = WebRtcPcm16b_Encode(&sample_value, 1, encoded_sample_); |
| RTC_CHECK_EQ(2U, encoded_len); |
| } |
| |
| std::unique_ptr<Packet> ConstantPcmPacketSource::NextPacket() { |
| RTC_CHECK_GT(packet_len_bytes_, kHeaderLenBytes); |
| uint8_t* packet_memory = new uint8_t[packet_len_bytes_]; |
| // Fill the payload part of the packet memory with the pre-encoded value. |
| for (unsigned i = 0; i < 2 * payload_len_samples_; ++i) |
| packet_memory[kHeaderLenBytes + i] = encoded_sample_[i % 2]; |
| WriteHeader(packet_memory); |
| // |packet| assumes ownership of |packet_memory|. |
| std::unique_ptr<Packet> packet( |
| new Packet(packet_memory, packet_len_bytes_, next_arrival_time_ms_)); |
| next_arrival_time_ms_ += payload_len_samples_ / samples_per_ms_; |
| return packet; |
| } |
| |
| void ConstantPcmPacketSource::WriteHeader(uint8_t* packet_memory) { |
| packet_memory[0] = 0x80; |
| packet_memory[1] = static_cast<uint8_t>(payload_type_); |
| packet_memory[2] = seq_number_ >> 8; |
| packet_memory[3] = seq_number_ & 0xFF; |
| packet_memory[4] = timestamp_ >> 24; |
| packet_memory[5] = (timestamp_ >> 16) & 0xFF; |
| packet_memory[6] = (timestamp_ >> 8) & 0xFF; |
| packet_memory[7] = timestamp_ & 0xFF; |
| packet_memory[8] = payload_ssrc_ >> 24; |
| packet_memory[9] = (payload_ssrc_ >> 16) & 0xFF; |
| packet_memory[10] = (payload_ssrc_ >> 8) & 0xFF; |
| packet_memory[11] = payload_ssrc_ & 0xFF; |
| ++seq_number_; |
| timestamp_ += static_cast<uint32_t>(payload_len_samples_); |
| } |
| |
| } // namespace test |
| } // namespace webrtc |