[NOT FOR REVIEW] Convert channel counts to size_t.

webrtc/modules/audio_coding/neteq/tools/neteq_external_decoder_test.cc

 /*
  *  Copyright (c) 2015 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/neteq_external_decoder_test.h"
 
 #include "testing/gtest/include/gtest/gtest.h"
+#include "webrtc/base/format_macros.h"
 
 namespace webrtc {
 namespace test {
 
 NetEqExternalDecoderTest::NetEqExternalDecoderTest(NetEqDecoder codec,
                                                    AudioDecoder* decoder)
     : codec_(codec),
       decoder_(decoder),
       sample_rate_hz_(CodecSampleRateHz(codec_)),
-      channels_(static_cast<int>(decoder_->Channels())) {
+      channels_(decoder_->Channels()) {
   NetEq::Config config;
   config.sample_rate_hz = sample_rate_hz_;
   neteq_.reset(NetEq::Create(config));
-  printf("%d\n", channels_);
+  printf("%" PRIuS "\n", channels_);
 }
 
 void NetEqExternalDecoderTest::Init() {
   ASSERT_EQ(NetEq::kOK, neteq_->RegisterExternalDecoder(
                             decoder_, codec_, kPayloadType, sample_rate_hz_));
 }
 
 void NetEqExternalDecoderTest::InsertPacket(WebRtcRTPHeader rtp_header,
                                             const uint8_t* payload,
                                             size_t payload_size_bytes,
                                             uint32_t receive_timestamp) {
   ASSERT_EQ(
       NetEq::kOK,
       neteq_->InsertPacket(
           rtp_header, payload, payload_size_bytes, receive_timestamp));
 }
 
 size_t NetEqExternalDecoderTest::GetOutputAudio(size_t max_length,
                                                 int16_t* output,
                                                 NetEqOutputType* output_type) {
   // Get audio from regular instance.
   size_t samples_per_channel;
-  int num_channels;
+  size_t num_channels;
   EXPECT_EQ(NetEq::kOK,
             neteq_->GetAudio(max_length,
                              output,
                              &samples_per_channel,
                              &num_channels,
                              output_type));
   EXPECT_EQ(channels_, num_channels);
   EXPECT_EQ(static_cast<size_t>(kOutputLengthMs * sample_rate_hz_ / 1000),
             samples_per_channel);
   return samples_per_channel;
 }
 
 }  // namespace test
 }  // namespace webrtc