diff --git a/iOS/APIExample-Audio/APIExample-Audio/Examples/Advanced/CustomPcmAudioSource/CustomPcmAudioSource.swift b/iOS/APIExample-Audio/APIExample-Audio/Examples/Advanced/CustomPcmAudioSource/CustomPcmAudioSource.swift
index ce7da158b..69b7d1ece 100644
--- a/iOS/APIExample-Audio/APIExample-Audio/Examples/Advanced/CustomPcmAudioSource/CustomPcmAudioSource.swift
+++ b/iOS/APIExample-Audio/APIExample-Audio/Examples/Advanced/CustomPcmAudioSource/CustomPcmAudioSource.swift
@@ -143,7 +143,7 @@ class CustomPcmAudioSourceMain: BaseViewController {
 extension CustomPcmAudioSourceMain: AgoraPcmSourcePushDelegate {
     func onAudioFrame(data: UnsafeMutablePointer<UInt8>) {
         agoraKit.pushExternalAudioFrameRawData(data,
-                                               samples: samples,
+                                               samples: samples*Int(channel),
                                                sampleRate: Int(sampleRate),
                                                channels: Int(channel),
                                                trackId: Int(trackId),
diff --git a/iOS/APIExample/APIExample/Examples/Advanced/CustomPcmAudioSource/CustomPcmAudioSource.swift b/iOS/APIExample/APIExample/Examples/Advanced/CustomPcmAudioSource/CustomPcmAudioSource.swift
index 55582ffb8..f6bb34b48 100644
--- a/iOS/APIExample/APIExample/Examples/Advanced/CustomPcmAudioSource/CustomPcmAudioSource.swift
+++ b/iOS/APIExample/APIExample/Examples/Advanced/CustomPcmAudioSource/CustomPcmAudioSource.swift
@@ -142,7 +142,7 @@ class CustomPcmAudioSourceMain: BaseViewController {
 extension CustomPcmAudioSourceMain: AgoraPcmSourcePushDelegate {
     func onAudioFrame(data: UnsafeMutablePointer<UInt8>) {
         agoraKit.pushExternalAudioFrameRawData(data,
-                                               samples: samples,
+                                               samples: samples*Int(channel),
                                                sampleRate: Int(sampleRate),
                                                channels: Int(channel),
                                                trackId: Int(trackId),