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CDImageCHD: Align tracks to 4 frames 

Fixes games having "randomly" offset audio.
This commit is contained in:
Connor McLaughlin 2020-10-03 21:50:18 +10:00
parent 13bd50a6a9
commit 48d053cd7b
1 changed files with 14 additions and 9 deletions
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23
src/common/cd_image_chd.cpp
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@ -2,6 +2,7 @@
#define _CRT_SECURE_NO_WARNINGS
#endif
#include "align.h"
#include "assert.h"
#include "cd_image.h"
#include "cd_subchannel_replacement.h"
@ -10,10 +11,10 @@
#include "libchdr/chd.h"
#include "log.h"
#include <algorithm>
#include <cerrno>
#include <cstdio>
#include <cstring>
#include <map>
#include <cerrno>
#include <optional>
Log_SetChannel(CDImageCHD);
@ -55,7 +56,8 @@ protected:
private:
enum : u32
{
CHD_SECTOR_DATA_SIZE = 2352 + 96,
CHD_CD_SECTOR_DATA_SIZE = 2352 + 96,
CHD_CD_TRACK_ALIGNMENT = 4
};
bool ReadHunk(u32 hunk_index);
@ -100,13 +102,13 @@ bool CDImageCHD::Open(const char* filename)
const chd_header* header = chd_get_header(m_chd);
m_hunk_size = header->hunkbytes;
if ((m_hunk_size % CHD_SECTOR_DATA_SIZE) != 0)
if ((m_hunk_size % CHD_CD_SECTOR_DATA_SIZE) != 0)
{
Log_ErrorPrintf("Hunk size (%u) is not a multiple of %u", m_hunk_size, CHD_SECTOR_DATA_SIZE);
Log_ErrorPrintf("Hunk size (%u) is not a multiple of %u", m_hunk_size, CHD_CD_SECTOR_DATA_SIZE);
return false;
}
m_sectors_per_hunk = m_hunk_size / CHD_SECTOR_DATA_SIZE;
m_sectors_per_hunk = m_hunk_size / CHD_CD_SECTOR_DATA_SIZE;
m_hunk_buffer.resize(m_hunk_size);
m_filename = filename;
@ -200,7 +202,7 @@ bool CDImageCHD::Open(const char* filename)
pregap_index.file_index = 0;
pregap_index.file_offset = file_lba;
pregap_index.file_sector_size = CHD_SECTOR_DATA_SIZE;
pregap_index.file_sector_size = CHD_CD_SECTOR_DATA_SIZE;
file_lba += pregap_frames;
frames -= pregap_frames;
}
@ -220,7 +222,7 @@ bool CDImageCHD::Open(const char* filename)
index.track_number = track_num;
index.index_number = 1;
index.file_index = 0;
index.file_sector_size = CHD_SECTOR_DATA_SIZE;
index.file_sector_size = CHD_CD_SECTOR_DATA_SIZE;
index.file_offset = file_lba;
index.mode = mode.value();
index.control.bits = control.bits;
@ -231,6 +233,9 @@ bool CDImageCHD::Open(const char* filename)
disc_lba += index.length;
file_lba += index.length;
num_tracks++;
// each track is padded to a multiple of 4 frames, see chdman source.
file_lba = Common::AlignUp(file_lba, CHD_CD_TRACK_ALIGNMENT);
}
m_lba_count = disc_lba;
@ -295,8 +300,8 @@ bool CDImageCHD::ReadSectorFromIndex(void* buffer, const Index& index, LBA lba_i
{
const u32 disc_frame = static_cast<LBA>(index.file_offset) + lba_in_index;
const u32 hunk_index = static_cast<u32>(disc_frame / m_sectors_per_hunk);
const u32 hunk_offset = static_cast<u32>((disc_frame % m_sectors_per_hunk) * CHD_SECTOR_DATA_SIZE);
DebugAssert((m_hunk_size - hunk_offset) >= CHD_SECTOR_DATA_SIZE);
const u32 hunk_offset = static_cast<u32>((disc_frame % m_sectors_per_hunk) * CHD_CD_SECTOR_DATA_SIZE);
DebugAssert((m_hunk_size - hunk_offset) >= CHD_CD_SECTOR_DATA_SIZE);
if (m_current_hunk_index != hunk_index && !ReadHunk(hunk_index))
return false;