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Audio decoder now takes a "sequence" offset to feed to the WMAPro decoder.

This commit is contained in:
Dr. Chat 2015-05-28 21:57:57 -05:00
parent 0050b3df83
commit 4675a1e17a
2 changed files with 7 additions and 8 deletions
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11
src/xenia/apu/audio_decoder.cc
View File

@ -22,7 +22,7 @@ extern "C" {
namespace xe {
namespace apu {
AudioDecoder::AudioDecoder() : offset_(0), codec_(nullptr), context_(nullptr),
AudioDecoder::AudioDecoder() : codec_(nullptr), context_(nullptr),
decoded_frame_(nullptr), packet_(nullptr) {}
AudioDecoder::~AudioDecoder() {
@ -100,7 +100,7 @@ int AudioDecoder::Initialize(int bits) {
return 0;
}
int AudioDecoder::PreparePacket(uint8_t* input, size_t size,
int AudioDecoder::PreparePacket(uint8_t* input, size_t seq_offset, size_t size,
int sample_rate, int channels) {
if (size != XMAContextData::kBytesPerBlock) {
// Invalid packet size!
@ -115,9 +115,8 @@ int AudioDecoder::PreparePacket(uint8_t* input, size_t size,
std::memcpy(packet_data_, input, size);
// Modify the packet header so it's WMAPro compatible
*((int *)packet_data_) = (((offset_ & 0x7800) | 0x400) >> 7) |
*((int *)packet_data_) = (((seq_offset & 0x7800) | 0x400) >> 7) |
(*((int*)packet_data_) & 0xFFFEFF08);
offset_ += XMAContextData::kBytesPerBlock; // Sequence number
packet_->data = packet_data_;
packet_->size = XMAContextData::kBytesPerBlock;
@ -201,10 +200,10 @@ int AudioDecoder::DecodePacket(uint8_t* output, size_t output_offset, size_t out
for (int i = 0; i < decoded_frame_->nb_samples; i++) {
// Raw sample should be within [-1, 1]
float fRawSample = sample_array[i];
float fScaledSample = fRawSample * (1 << (bits_ - 1));
float fScaledSample = fRawSample * ((1 << bits_) - 1);
// Clamp the sample in range
int64_t range = (1 << (bits_ - 1));
int64_t range = (1 << bits_) * 2;
if (fScaledSample > (range - 1)) {
fScaledSample = (float)range;
} else if (fScaledSample < (-range + 1)) {

4
src/xenia/apu/audio_decoder.h
View File

@ -38,7 +38,8 @@ class AudioDecoder {
int Initialize(int bits);
int PreparePacket(uint8_t* input, size_t size, int sample_rate, int channels);
int PreparePacket(uint8_t* input, size_t seq_offset, size_t size,
int sample_rate, int channels);
void DiscardPacket();
int DecodePacket(uint8_t* output, size_t offset, size_t size);
@ -54,7 +55,6 @@ class AudioDecoder {
size_t current_frame_pos_;
uint8_t* current_frame_;
uint32_t frame_samples_size_;
int offset_;
uint8_t packet_data_[XMAContextData::kBytesPerBlock];
};