46 lines
1.4 KiB
C++
46 lines
1.4 KiB
C++
/**
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******************************************************************************
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* Xenia : Xbox 360 Emulator Research Project *
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******************************************************************************
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* Copyright 2021 Ben Vanik. All rights reserved. *
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* Released under the BSD license - see LICENSE in the root for more details. *
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******************************************************************************
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*
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* @modified Tom Clay, 2026 - Adapted for ReXGlue runtime
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*/
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// This file contains some functions used to help parse XMA data.
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#pragma once
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#include <stdint.h>
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namespace rex::audio::xma {
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static constexpr uint32_t kMaxFrameLength = 0x7FFF;
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// Get number of frames that /begin/ in this packet. Valid only for XMA2 packets.
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inline uint8_t GetPacketFrameCount(const uint8_t* packet) {
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return packet[0] >> 2;
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}
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// Get the first frame offset in bits
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inline uint32_t GetPacketFrameOffset(const uint8_t* packet) {
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uint32_t val =
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static_cast<uint16_t>(((packet[0] & 0x3) << 13) | (packet[1] << 5) | (packet[2] >> 3));
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return val + 32;
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}
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inline uint8_t GetPacketMetadata(const uint8_t* packet) {
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return packet[2] & 0x7;
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}
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inline bool IsPacketXma2Type(const uint8_t* packet) {
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return GetPacketMetadata(packet) == 1;
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}
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inline uint8_t GetPacketSkipCount(const uint8_t* packet) {
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return packet[3];
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}
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} // namespace rex::audio::xma
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