Adding codecs to the RtpParameters returned by an RtpSender.

webrtc/api/objc/RTCRtpCodecParameters.mm

+/*
+ *  Copyright 2016 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.
+ */
+
+#import "RTCRtpCodecParameters+Private.h"
+
+#import "webrtc/base/objc/NSString+StdString.h"
+
+NSString * const kRtxCodecMimeType = @"rtx";

[tkchin_webrtc, 2016/04/14 21:11:47]

nit: point at the constants directly? e.g. const NSString * const
kRtxCodecMimeType = @(cricket::kRtxCodecName);

I *think* this works.

[Taylor Brandstetter, 2016/04/14 22:03:31]

Done.

+NSString * const kRedCodecMimeType = @"RED";
+NSString * const kUlpfecCodecMimeType = @"ulpfec";
+NSString * const kOpusCodecMimeType = @"opus";
+NSString * const kIsacCodecMimeType = @"ISAC";
+NSString * const kL16CodecMimeType  = @"L16";
+NSString * const kG722CodecMimeType = @"G722";
+NSString * const kIlbcCodecMimeType = @"ILBC";
+NSString * const kPcmuCodecMimeType = @"PCMU";
+NSString * const kPcmaCodecMimeType = @"PCMA";
+NSString * const kDtmfCodecMimeType = @"telephone-event";
+NSString * const kComfortNoiseCodecMimeType = @"CN";
+NSString * const kVp8CodecMimeType = @"VP8";
+NSString * const kVp9CodecMimeType = @"VP9";
+NSString * const kH264CodecMimeType = @"H264";
+
+@implementation RTCRtpCodecParameters
+
+@synthesize payloadType = _payloadType;
+@synthesize mimeType = _mimeType;
+@synthesize clockRate = _clockRate;
+@synthesize channels = _channels;
+
+- (instancetype)init {
+  return [super init];
+}
+
+- (instancetype)initWithNativeParameters:
+    (const webrtc::RtpCodecParameters &)nativeParameters {
+  if (self = [self init]) {
+    _payloadType = nativeParameters.payload_type;
+    _mimeType = [NSString stringForStdString:nativeParameters.mime_type];
+    _clockRate = nativeParameters.clock_rate;
+    _channels = nativeParameters.channels;
+  }
+  return self;
+}
+
+- (webrtc::RtpCodecParameters)nativeParameters {
+  webrtc::RtpCodecParameters parameters;
+  parameters.payload_type = _payloadType;
+  parameters.mime_type = [NSString stdStringForString:_mimeType];
+  parameters.clock_rate = _clockRate;
+  parameters.channels = _channels;
+  return parameters;
+}
+
+@end