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Common: Add helper functions for decoding CD-XA ADPCM

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Connor McLaughlin
2019-10-15 17:24:11 +10:00
parent b2632db0a7
commit 2b6ebf9955
5 changed files with 173 additions and 29 deletions
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30
src/common/cd_image.h
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@ -16,10 +16,9 @@ public:
DATA_SECTOR_SIZE = 2048,
SECTOR_SYNC_SIZE = 12,
SECTOR_HEADER_SIZE = 4,
SECTOR_XA_SUBHEADER_SIZE = 4,
FRAMES_PER_SECOND = 75, // "sectors"
SECONDS_PER_MINUTE = 60,
FRAMES_PER_MINUTE = FRAMES_PER_SECOND * SECONDS_PER_MINUTE,
FRAMES_PER_MINUTE = FRAMES_PER_SECOND * SECONDS_PER_MINUTE
};
enum class ReadMode : u32
@ -37,33 +36,6 @@ public:
u8 sector_mode;
};
struct XASubHeader
{
u8 file_number;
u8 channel_number;
union Submode
{
u8 bits;
BitField<u8, bool, 0, 1> eor;
BitField<u8, bool, 1, 1> video;
BitField<u8, bool, 2, 1> audio;
BitField<u8, bool, 3, 1> data;
BitField<u8, bool, 4, 1> trigger;
BitField<u8, bool, 5, 1> form2;
BitField<u8, bool, 6, 1> realtime;
BitField<u8, bool, 7, 1> eof;
} submode;
union Codinginfo
{
u8 bits;
BitField<u8, u8, 0, 2> mono_stereo;
BitField<u8, u8, 2, 2> sample_rate;
BitField<u8, u8, 4, 2> bits_per_sample;
BitField<u8, bool, 6, 1> emphasis;
} codinginfo;
};
// Conversion helpers.
static constexpr u64 MSFToLBA(u32 pregap_seconds, u32 minute, u32 second, u32 frame);
static constexpr void LBAToMSF(u32 pregap_seconds, u64 lba, u32* minute, u32* second, u32* frame);