Changed AudioEncoder::Encode to take an rtc::Buffer* instead of uint8_t* and a maximum size.

webrtc/modules/audio_coding/neteq/test/neteq_isac_quality_test.cc

Index: webrtc/modules/audio_coding/neteq/test/neteq_isac_quality_test.cc
diff --git a/webrtc/modules/audio_coding/neteq/test/neteq_isac_quality_test.cc b/webrtc/modules/audio_coding/neteq/test/neteq_isac_quality_test.cc
index 4ccebb3e66e84426182a4e9d9ffc07c04f6d001a..2ebd1927bc4de2197656ca4e6fac33a6d843aeea 100644
--- a/webrtc/modules/audio_coding/neteq/test/neteq_isac_quality_test.cc
+++ b/webrtc/modules/audio_coding/neteq/test/neteq_isac_quality_test.cc
@@ -44,7 +44,7 @@ class NetEqIsacQualityTest : public NetEqQualityTest {
   void SetUp() override;
   void TearDown() override;
   virtual int EncodeBlock(int16_t* in_data, size_t block_size_samples,
-                          uint8_t* payload, size_t max_bytes);
+                          rtc::Buffer* payload, size_t max_bytes);
  private:
   ISACFIX_MainStruct* isac_encoder_;
   int bit_rate_kbps_;
@@ -78,7 +78,7 @@ void NetEqIsacQualityTest::TearDown() {
 
 int NetEqIsacQualityTest::EncodeBlock(int16_t* in_data,
                                       size_t block_size_samples,
-                                      uint8_t* payload, size_t max_bytes) {
+                                      rtc::Buffer* payload, size_t max_bytes) {
   // ISAC takes 10 ms for every call.
   const int subblocks = kIsacBlockDurationMs / 10;
   const int subblock_length = 10 * kIsacInputSamplingKhz;
@@ -89,7 +89,11 @@ int NetEqIsacQualityTest::EncodeBlock(int16_t* in_data,
     // The Isac encoder does not perform encoding (and returns 0) until it
     // receives a sequence of sub-blocks that amount to the frame duration.
     EXPECT_EQ(0, value);
-    value = WebRtcIsacfix_Encode(isac_encoder_, &in_data[pointer], payload);
+    payload->AppendData(max_bytes, [&] (rtc::ArrayView<uint8_t> payload) {
+        value = WebRtcIsacfix_Encode(isac_encoder_, &in_data[pointer],
+                                     payload.data());
+        return (value >= 0) ? static_cast<size_t>(value) : 0;
+      });
   }
   EXPECT_GT(value, 0);
   return value;