1 files changed, 70 insertions, 0 deletions
diff --git a/webrtc/modules/audio_coding/neteq/tools/constant_pcm_packet_source.cc b/webrtc/modules/audio_coding/neteq/tools/constant_pcm_packet_source.cc
new file mode 100644
index 0000000000..dc07030dd6
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+++ b/webrtc/modules/audio_coding/neteq/tools/constant_pcm_packet_source.cc
@@ -0,0 +1,70 @@
+/*
+ *  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/include/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);
+}
+
+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|.
+  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