add scalabilityMode for AV1.

Author: cloudwebrtc

sdk/objc/api/peerconnection/RTCVideoCodecInfo+Private.mm

@@ -12,6 +12,11 @@
 
 #import "helpers/NSString+StdString.h"
 
+#include "absl/container/inlined_vector.h"
+#include "api/video_codecs/sdp_video_format.h"
+#include "modules/video_coding/svc/scalability_mode_util.h"
+#include "modules/video_coding/svc/create_scalability_structure.h"
+
 @implementation RTC_OBJC_TYPE (RTCVideoCodecInfo)
 (Private)
 
@@ -31,8 +36,16 @@ - (instancetype)initWithNativeSdpVideoFormat : (webrtc::SdpVideoFormat)format {
     std::string value = [NSString stdStringForString:self.parameters[paramKey]];
     parameters[key] = value;
   }
-
-  return webrtc::SdpVideoFormat([NSString stdStringForString:self.name], parameters);
+    
+ absl::InlinedVector<webrtc::ScalabilityMode, webrtc::kScalabilityModeCount>
+    scalability_modes;
+  for (NSString *scalabilityMode in self.scalabilityModes) {
+    auto scalability_mode = webrtc::ScalabilityModeFromString([NSString stdStringForString:scalabilityMode]);
+    if (scalability_mode != absl::nullopt) {
+      scalability_modes.push_back(*scalability_mode);
+    }
+  }
+  return webrtc::SdpVideoFormat([NSString stdStringForString:self.name], parameters, scalability_modes);
 }
 
 @end

sdk/objc/api/video_codec/RTCVideoEncoderAV1.h

@@ -24,4 +24,6 @@ RTC_OBJC_EXPORT
 
 + (bool)isSupported;
 
++ (NSArray<NSString *> *)scalabilityModes;
+
 @end

sdk/objc/api/video_codec/RTCVideoEncoderAV1.mm

@@ -14,6 +14,12 @@
 #import "RTCMacros.h"
 #import "RTCVideoEncoderAV1.h"
 #import "RTCWrappedNativeVideoEncoder.h"
+
+#import "helpers/NSString+StdString.h"
+
+#include "absl/container/inlined_vector.h"
+#include "api/video_codecs/sdp_video_format.h"
+#include "modules/video_coding/codecs/av1/av1_svc_config.h"
 #include "modules/video_coding/codecs/av1/libaom_av1_encoder.h"
 
 @implementation RTC_OBJC_TYPE (RTCVideoEncoderAV1)
@@ -28,4 +34,14 @@ + (bool)isSupported {
   return true;
 }
 
++ (NSArray<NSString *> *)scalabilityModes {
+    absl::InlinedVector<webrtc::ScalabilityMode, webrtc::kScalabilityModeCount>
+        scalability_modes = webrtc::LibaomAv1EncoderSupportedScalabilityModes();
+    NSMutableArray<NSString *> *scalabilityModes = [NSMutableArray array];
+    for (const webrtc::ScalabilityMode &scalability_mode : scalability_modes) {
+      [scalabilityModes addObject:[NSString stringForAbslStringView:webrtc::ScalabilityModeToString(scalability_mode)]];
+    }
+    return scalabilityModes;
+}
+
 @end

sdk/objc/base/RTCVideoCodecInfo.h

@@ -26,10 +26,16 @@ RTC_OBJC_EXPORT
                   parameters:(nullable NSDictionary<NSString *, NSString *> *)parameters
     NS_DESIGNATED_INITIALIZER;
 
+- (instancetype)initWithName:(NSString *)name
+                  parameters:(nullable NSDictionary<NSString *, NSString *> *)parameters
+             scalabilityModes:(nullable NSArray<NSString *> *)scalabilityModes
+    NS_DESIGNATED_INITIALIZER;
+
 - (BOOL)isEqualToCodecInfo:(RTC_OBJC_TYPE(RTCVideoCodecInfo) *)info;
 
 @property(nonatomic, readonly) NSString *name;
 @property(nonatomic, readonly) NSDictionary<NSString *, NSString *> *parameters;
+@property(nonatomic, readonly) NSArray<NSString *> *scalabilityModes;
 
 @end
 

sdk/objc/base/RTCVideoCodecInfo.m

@@ -14,6 +14,7 @@ @implementation RTC_OBJC_TYPE (RTCVideoCodecInfo)
 
 @synthesize name = _name;
 @synthesize parameters = _parameters;
+@synthesize scalabilityModes = _scalabilityModes;
 
 - (instancetype)initWithName:(NSString *)name {
   return [self initWithName:name parameters:nil];
@@ -24,15 +25,29 @@ - (instancetype)initWithName:(NSString *)name
   if (self = [super init]) {
     _name = name;
     _parameters = (parameters ? parameters : @{});
+    _scalabilityModes = @[];
   }
 
   return self;
 }
 
+- (instancetype)initWithName:(NSString *)name
+                  parameters:(nullable NSDictionary<NSString *, NSString *> *)parameters
+             scalabilityModes:(nullable NSArray<NSString *> *)scalabilityModes {
+    if (self = [super init]) {
+      _name = name;
+      _parameters = (parameters ? parameters : @{});
+      _scalabilityModes = (scalabilityModes ? scalabilityModes : @[]);
+    }
+
+    return self;
+  }
+
 - (BOOL)isEqualToCodecInfo:(RTC_OBJC_TYPE(RTCVideoCodecInfo) *)info {
   if (!info ||
       ![self.name isEqualToString:info.name] ||
-      ![self.parameters isEqualToDictionary:info.parameters]) {
+      ![self.parameters isEqualToDictionary:info.parameters] ||
+      ![self.scalabilityModes isEqualToArray:info.scalabilityModes]) {
     return NO;
   }
   return YES;

sdk/objc/components/video_codec/RTCDefaultVideoEncoderFactory.m

@@ -59,7 +59,9 @@ @implementation RTC_OBJC_TYPE (RTCDefaultVideoEncoderFactory)
   }
 
 #if defined(RTC_USE_LIBAOM_AV1_ENCODER)
-  [result addObject:[[RTC_OBJC_TYPE(RTCVideoCodecInfo) alloc] initWithName:kRTCVideoCodecAv1Name]];
+  RTC_OBJC_TYPE(RTCVideoCodecInfo) *av1Info =
+    [[RTC_OBJC_TYPE(RTCVideoCodecInfo) alloc] initWithName:kRTCVideoCodecAv1Name parameters:nil scalabilityModes:[RTCVideoEncoderAV1 scalabilityModes]];
+  [result addObject:av1Info];
 #endif
 
   return result;