[NOT FOR REVIEW] Convert channel counts to size_t.

webrtc/modules/audio_processing/audio_processing_impl.cc

Index: webrtc/modules/audio_processing/audio_processing_impl.cc
diff --git a/webrtc/modules/audio_processing/audio_processing_impl.cc b/webrtc/modules/audio_processing/audio_processing_impl.cc
index b1ea6e30033f546c9b84a9e262fd240f2691f08a..4cbdae081448afeb5abc907f79d8f4f4fa189079 100644
--- a/webrtc/modules/audio_processing/audio_processing_impl.cc
+++ b/webrtc/modules/audio_processing/audio_processing_impl.cc
@@ -343,16 +343,13 @@ int AudioProcessingImpl::InitializeLocked() {
 
 int AudioProcessingImpl::InitializeLocked(const ProcessingConfig& config) {
   for (const auto& stream : config.streams) {
-    if (stream.num_channels() < 0) {
-      return kBadNumberChannelsError;
-    }
     if (stream.num_channels() > 0 && stream.sample_rate_hz() <= 0) {
       return kBadSampleRateError;
     }
   }
 
-  const int num_in_channels = config.input_stream().num_channels();
-  const int num_out_channels = config.output_stream().num_channels();
+  const size_t num_in_channels = config.input_stream().num_channels();
+  const size_t num_out_channels = config.output_stream().num_channels();
 
   // Need at least one input channel.
   // Need either one output channel or as many outputs as there are inputs.
@@ -362,8 +359,7 @@ int AudioProcessingImpl::InitializeLocked(const ProcessingConfig& config) {
   }
 
   if (beamformer_enabled_ &&
-      (static_cast<size_t>(num_in_channels) != array_geometry_.size() ||
-       num_out_channels > 1)) {
+      (num_in_channels != array_geometry_.size() || num_out_channels > 1)) {
     return kBadNumberChannelsError;
   }
 
@@ -457,15 +453,15 @@ int AudioProcessingImpl::proc_split_sample_rate_hz() const {
   return split_rate_;
 }
 
-int AudioProcessingImpl::num_reverse_channels() const {
+size_t AudioProcessingImpl::num_reverse_channels() const {
   return rev_proc_format_.num_channels();
 }
 
-int AudioProcessingImpl::num_input_channels() const {
+size_t AudioProcessingImpl::num_input_channels() const {
   return api_format_.input_stream().num_channels();
 }
 
-int AudioProcessingImpl::num_output_channels() const {
+size_t AudioProcessingImpl::num_output_channels() const {
   return api_format_.output_stream().num_channels();
 }
 
@@ -528,7 +524,7 @@ int AudioProcessingImpl::ProcessStream(const float* const* src,
     audioproc::Stream* msg = event_msg_->mutable_stream();
     const size_t channel_size =
         sizeof(float) * api_format_.input_stream().num_frames();
-    for (int i = 0; i < api_format_.input_stream().num_channels(); ++i)
+    for (size_t i = 0; i < api_format_.input_stream().num_channels(); ++i)
       msg->add_input_channel(src[i], channel_size);
   }
 #endif
@@ -542,7 +538,7 @@ int AudioProcessingImpl::ProcessStream(const float* const* src,
     audioproc::Stream* msg = event_msg_->mutable_stream();
     const size_t channel_size =
         sizeof(float) * api_format_.output_stream().num_frames();
-    for (int i = 0; i < api_format_.output_stream().num_channels(); ++i)
+    for (size_t i = 0; i < api_format_.output_stream().num_channels(); ++i)
       msg->add_output_channel(dest[i], channel_size);
     RETURN_ON_ERR(WriteMessageToDebugFile());
   }
@@ -702,7 +698,7 @@ int AudioProcessingImpl::AnalyzeReverseStream(
     return kNullPointerError;
   }
 
-  if (reverse_config.num_channels() <= 0) {
+  if (reverse_config.num_channels() == 0) {
     return kBadNumberChannelsError;
   }
 
@@ -719,7 +715,7 @@ int AudioProcessingImpl::AnalyzeReverseStream(
     audioproc::ReverseStream* msg = event_msg_->mutable_reverse_stream();
     const size_t channel_size =
         sizeof(float) * api_format_.reverse_stream().num_frames();
-    for (int i = 0; i < api_format_.reverse_stream().num_channels(); ++i)
+    for (size_t i = 0; i < api_format_.reverse_stream().num_channels(); ++i)
       msg->add_channel(data[i], channel_size);
     RETURN_ON_ERR(WriteMessageToDebugFile());
   }
@@ -1131,9 +1127,12 @@ int AudioProcessingImpl::WriteInitMessage() {
   event_msg_->set_type(audioproc::Event::INIT);
   audioproc::Init* msg = event_msg_->mutable_init();
   msg->set_sample_rate(api_format_.input_stream().sample_rate_hz());
-  msg->set_num_input_channels(api_format_.input_stream().num_channels());
-  msg->set_num_output_channels(api_format_.output_stream().num_channels());
-  msg->set_num_reverse_channels(api_format_.reverse_stream().num_channels());
+  msg->set_num_input_channels(static_cast<google::protobuf::int32>(
+      api_format_.input_stream().num_channels());
+  msg->set_num_output_channels(static_cast<google::protobuf::int32>(
+      api_format_.output_stream().num_channels());
+  msg->set_num_reverse_channels(static_cast<google::protobuf::int32>(
+      api_format_.reverse_stream().num_channels());
   msg->set_reverse_sample_rate(api_format_.reverse_stream().sample_rate_hz());
   msg->set_output_sample_rate(api_format_.output_stream().sample_rate_hz());