Add sample rate field to AAC decoder (#5195)

* Add sample rate field to AAC decoder

* Fix TODO comment

* Remove unneeded conversion

src/audio_core/hle/decoder.cpp

@@ -6,6 +6,32 @@
 
 namespace AudioCore::HLE {
 
+DecoderSampleRate GetSampleRateEnum(u32 sample_rate) {
+    switch (sample_rate) {
+    case 48000:
+        return DecoderSampleRate::Rate48000;
+    case 44100:
+        return DecoderSampleRate::Rate44100;
+    case 32000:
+        return DecoderSampleRate::Rate32000;
+    case 24000:
+        return DecoderSampleRate::Rate24000;
+    case 22050:
+        return DecoderSampleRate::Rate22050;
+    case 16000:
+        return DecoderSampleRate::Rate16000;
+    case 12000:
+        return DecoderSampleRate::Rate12000;
+    case 11025:
+        return DecoderSampleRate::Rate11025;
+    case 8000:
+        return DecoderSampleRate::Rate8000;
+    default:
+        LOG_WARNING(Audio_DSP, "Unknown decoder sample rate: {}", sample_rate);
+        return DecoderSampleRate::Rate48000;
+    }
+}
+
 DecoderBase::~DecoderBase(){};
 
 NullDecoder::NullDecoder() = default;

src/audio_core/hle/decoder.h

@@ -24,6 +24,20 @@ enum class DecoderCodec : u16 {
     AAC,
 };
 
+// TODO(xperia64): I'm guessing that this is a u32 (from when it was an unknown)
+// but it could be a u16 or u8 I suppose
+enum class DecoderSampleRate : u32 {
+    Rate48000 = 0,
+    Rate44100 = 1,
+    Rate32000 = 2,
+    Rate24000 = 3,
+    Rate22050 = 4,
+    Rate16000 = 5,
+    Rate12000 = 6,
+    Rate11025 = 7,
+    Rate8000 = 8
+};
+
 struct BinaryRequest {
     enum_le<DecoderCodec> codec =
         DecoderCodec::None; // this is a guess. until now only 0x1 was observed here
@@ -43,7 +57,7 @@ struct BinaryResponse {
         DecoderCodec::None; // this could be something else. until now only 0x1 was observed here
     enum_le<DecoderCommand> cmd = DecoderCommand::Init;
     u32_le unknown1 = 0;
-    u32_le unknown2 = 0;
+    enum_le<DecoderSampleRate> sample_rate;
     u32_le num_channels = 0; // this is a guess, so far I only observed 2 here
     u32_le size = 0;
     u32_le unknown3 = 0;
@@ -52,6 +66,8 @@ struct BinaryResponse {
 };
 static_assert(sizeof(BinaryResponse) == 32, "Unexpected struct size for BinaryResponse");
 
+enum_le<DecoderSampleRate> GetSampleRateEnum(u32 sample_rate);
+
 class DecoderBase {
 public:
     virtual ~DecoderBase();

src/audio_core/hle/fdk_decoder.cpp

@@ -175,6 +175,7 @@ std::optional<BinaryResponse> FDKDecoder::Impl::Decode(const BinaryRequest& requ
             // get the stream information
             stream_info = aacDecoder_GetStreamInfo(decoder);
             // fill the stream information for binary response
+            response.sample_rate = GetSampleRateEnum(stream_info->sampleRate);
             response.num_channels = stream_info->aacNumChannels;
             response.num_samples = stream_info->frameSize;
             // fill the output

src/audio_core/hle/ffmpeg_decoder.cpp

@@ -211,6 +211,7 @@ std::optional<BinaryResponse> FFMPEGDecoder::Impl::Decode(const BinaryRequest& r
 
                 std::size_t size = bytes_per_sample * (decoded_frame->nb_samples);
 
+                response.sample_rate = GetSampleRateEnum(decoded_frame->sample_rate);
                 response.num_channels = decoded_frame->channels;
                 response.num_samples += decoded_frame->nb_samples;
 

src/audio_core/hle/mediandk_decoder.cpp

@@ -138,6 +138,7 @@ std::optional<BinaryResponse> MediaNDKDecoder::Impl::Decode(const BinaryRequest&
     u8* data = mMemory.GetFCRAMPointer(request.src_addr - Memory::FCRAM_PADDR);
     ADTSData adts_data = ParseADTS(reinterpret_cast<const char*>(data));
     SetMediaType(adts_data);
+    response.sample_rate = GetSampleRateEnum(adts_data.samplerate);
     response.num_channels = adts_data.channels;
     if (!mDecoder) {
         LOG_ERROR(Audio_DSP, "Missing decoder for profile: {}, channels: {}, samplerate: {}",

src/audio_core/hle/wmf_decoder.cpp

@@ -219,6 +219,7 @@ std::optional<BinaryResponse> WMFDecoder::Impl::Decode(const BinaryRequest& requ
         return response;
     }
 
+    response.sample_rate = GetSampleRateEnum(adts_meta->ADTSHeader.samplerate);
     response.num_channels = adts_meta->ADTSHeader.channels;
 
     if (!format_selected) {