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<div id="projectbrief">Aaru Data Preservation Suite - Format Library</div>
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<p>Core public constants and compile‑time limits for the Aaru container format implementation.
<a href="#details">More...</a></p>
<p><a href="consts_8h_source.html">Go to the source code of this file.</a></p>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 id="header-define-members" class="groupheader"><a id="define-members" name="define-members"></a>
Macros</h2></td></tr>
<tr class="memitem:a13ba7a163f45ee45c977d63c408539ca" id="r_a13ba7a163f45ee45c977d63c408539ca"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="#a13ba7a163f45ee45c977d63c408539ca">DIC_MAGIC</a>&#160;&#160;&#160;0x544D52464D434944ULL</td></tr>
<tr class="memdesc:a13ba7a163f45ee45c977d63c408539ca"><td class="mdescLeft">&#160;</td><td class="mdescRight">Magic identifier for legacy DiscImageChef container (ASCII "DICMFRMT"). <br /></td></tr>
<tr class="memitem:a3c3ba66fe2b547655c9e4b16a1ba519a" id="r_a3c3ba66fe2b547655c9e4b16a1ba519a"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="#a3c3ba66fe2b547655c9e4b16a1ba519a">AARU_MAGIC</a>&#160;&#160;&#160;0x544D524655524141ULL</td></tr>
<tr class="memdesc:a3c3ba66fe2b547655c9e4b16a1ba519a"><td class="mdescLeft">&#160;</td><td class="mdescRight">Magic identifier for AaruFormat container (ASCII "AARUFRMT"). <br /></td></tr>
<tr class="memitem:adbbd4387273589f1c76a5f5786607013" id="r_adbbd4387273589f1c76a5f5786607013"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="#adbbd4387273589f1c76a5f5786607013">AARUF_VERSION</a>&#160;&#160;&#160;2</td></tr>
<tr class="memdesc:adbbd4387273589f1c76a5f5786607013"><td class="mdescLeft">&#160;</td><td class="mdescRight">Current image format major version (incompatible changes bump this). <br /></td></tr>
<tr class="memitem:ac837e146bff4d0f3603e4a9e444358c6" id="r_ac837e146bff4d0f3603e4a9e444358c6"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="#ac837e146bff4d0f3603e4a9e444358c6">AARUF_VERSION_V1</a>&#160;&#160;&#160;1</td></tr>
<tr class="memdesc:ac837e146bff4d0f3603e4a9e444358c6"><td class="mdescLeft">&#160;</td><td class="mdescRight">First on‑disk version (C# implementation). <br /></td></tr>
<tr class="memitem:ad2fdced5805aa0364f1c5b073f81dd76" id="r_ad2fdced5805aa0364f1c5b073f81dd76"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="#ad2fdced5805aa0364f1c5b073f81dd76">AARUF_VERSION_V2</a>&#160;&#160;&#160;2</td></tr>
<tr class="memdesc:ad2fdced5805aa0364f1c5b073f81dd76"><td class="mdescLeft">&#160;</td><td class="mdescRight">Second on‑disk version (C implementation). <br /></td></tr>
<tr class="memitem:a6c8469dfe973ac952cf40394bd2c160b" id="r_a6c8469dfe973ac952cf40394bd2c160b"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="#a6c8469dfe973ac952cf40394bd2c160b">MAX_CACHE_SIZE</a>&#160;&#160;&#160;536870912ULL</td></tr>
<tr class="memdesc:a6c8469dfe973ac952cf40394bd2c160b"><td class="mdescLeft">&#160;</td><td class="mdescRight">Maximum read cache size (bytes). <br /></td></tr>
<tr class="memitem:a25fd08252b97a0230d3efc899bddd240" id="r_a25fd08252b97a0230d3efc899bddd240"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="#a25fd08252b97a0230d3efc899bddd240">LZMA_PROPERTIES_LENGTH</a>&#160;&#160;&#160;5</td></tr>
<tr class="memdesc:a25fd08252b97a0230d3efc899bddd240"><td class="mdescLeft">&#160;</td><td class="mdescRight">Size in bytes of the fixed LZMA properties header (lc/lp/pb + dictionary size). <br /></td></tr>
<tr class="memitem:ac97c436bf02e6e7e7daea67d374f03cd" id="r_ac97c436bf02e6e7e7daea67d374f03cd"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="#ac97c436bf02e6e7e7daea67d374f03cd">MAX_DDT_ENTRY_CACHE</a>&#160;&#160;&#160;16000000</td></tr>
<tr class="memdesc:ac97c436bf02e6e7e7daea67d374f03cd"><td class="mdescLeft">&#160;</td><td class="mdescRight">Maximum number of cached DDT entry descriptors retained in memory for fast duplicate detection. <br /></td></tr>
<tr class="memitem:a44401191f17a7c09a05e57ff9e5cff24" id="r_a44401191f17a7c09a05e57ff9e5cff24"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="#a44401191f17a7c09a05e57ff9e5cff24">SAMPLES_PER_SECTOR</a>&#160;&#160;&#160;588</td></tr>
<tr class="memdesc:a44401191f17a7c09a05e57ff9e5cff24"><td class="mdescLeft">&#160;</td><td class="mdescRight">Red Book (CD‑DA) PCM samples per 2352‑byte sector: 44,100 Hz / 75 sectors per second = 588 samples. <br /></td></tr>
<tr class="memitem:a207a31e861ea8e3a4f5ef52c13b42b3d" id="r_a207a31e861ea8e3a4f5ef52c13b42b3d"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="#a207a31e861ea8e3a4f5ef52c13b42b3d">MAX_FLAKE_BLOCK</a>&#160;&#160;&#160;4608</td></tr>
<tr class="memdesc:a207a31e861ea8e3a4f5ef52c13b42b3d"><td class="mdescLeft">&#160;</td><td class="mdescRight">FLAC maximum block size used for encoding audio sectors. <br /></td></tr>
<tr class="memitem:a3fd3617b4eb7e9548e0fd0ca8990e44a" id="r_a3fd3617b4eb7e9548e0fd0ca8990e44a"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="#a3fd3617b4eb7e9548e0fd0ca8990e44a">MIN_FLAKE_BLOCK</a>&#160;&#160;&#160;256</td></tr>
<tr class="memdesc:a3fd3617b4eb7e9548e0fd0ca8990e44a"><td class="mdescLeft">&#160;</td><td class="mdescRight">FLAC minimum block size. <br /></td></tr>
<tr class="memitem:aa64757ba31a320f675fca1062111180f" id="r_aa64757ba31a320f675fca1062111180f"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="#aa64757ba31a320f675fca1062111180f">CD_XFIX_MASK</a>&#160;&#160;&#160;0xFF000000U</td></tr>
<tr class="memdesc:aa64757ba31a320f675fca1062111180f"><td class="mdescLeft">&#160;</td><td class="mdescRight">Mask for extracting correction / fix flags in Compact Disc suffix/prefix DDT entries. <br /></td></tr>
<tr class="memitem:a0b24c62ef1b78b72b9f4a42918f39e13" id="r_a0b24c62ef1b78b72b9f4a42918f39e13"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="#a0b24c62ef1b78b72b9f4a42918f39e13">CD_DFIX_MASK</a>&#160;&#160;&#160;0x00FFFFFFU</td></tr>
<tr class="memdesc:a0b24c62ef1b78b72b9f4a42918f39e13"><td class="mdescLeft">&#160;</td><td class="mdescRight">Mask for extracting positional index (lower 24 bits) in Compact Disc suffix/prefix deduplicated block entries. <br /></td></tr>
</table>
<a name="details" id="details"></a><h2 id="header-details" class="groupheader">Detailed Description</h2>
<div class="textblock"><p>Core public constants and compile‑time limits for the Aaru container format implementation. </p>
<p>This header exposes magic identifiers, format version selectors, resource limits, codec parameter bounds, and bit masks used across libaaruformat. All values are immutable interface contracts; changing them breaks backward compatibility unless a new format version is declared.</p>
<p>Summary:</p><ul>
<li>Magic numbers (DIC_MAGIC, AARU_MAGIC) identify container families (legacy DiscImageChef vs AaruFormat).</li>
<li>Version macros distinguish format generations (V1 C# / legacy CRC endianness, V2 current C implementation).</li>
<li>Cache and table size limits provide protective upper bounds against runaway memory consumption.</li>
<li>Audio constants (SAMPLES_PER_SECTOR, MIN/MAX_FLAKE_BLOCK) align with Red Book (CD‑DA) and FLAC encoding best practices.</li>
<li>CD_* masks assist with extracting flags / positional subfields in deduplicated Compact Disc sector tables.</li>
<li>CRC64 constants implement ECMA‑182 polynomial and standard seed, enabling deterministic end‑to‑end block integrity.</li>
</ul>
<p>Notes:</p><ul>
<li>Magic values are stored little‑endian on disk when written as 64‑bit integers; when inspecting raw bytes make sure to account for host endianness.</li>
<li>AARUF_VERSION must be incremented only when an incompatible on‑disk layout change is introduced.</li>
<li>MAX_DDT_ENTRY_CACHE is a soft upper bound sized to balance deduplication hit rate vs RAM; tune in future builds via configuration if adaptive heuristics are introduced.</li>
<li>The LZMA properties length (5) derives from the standard LZMA header (lc/lp/pb + dict size) and is constant for raw LZMA streams used here.</li>
<li>FLAC sample block guidance: empirical evaluation shows &gt;4608 samples per block does not yield meaningful ratio gains for typical optical audio captures while increasing decode buffer size.</li>
</ul>
<p>Thread safety: All macros are compile‑time constants; no synchronization required. Portability: Constants chosen to fit within 64‑bit targets; arithmetic assumes two's complement. </p>
<p class="definition">Definition in file <a class="el" href="consts_8h_source.html">consts.h</a>.</p>
</div><a name="doc-define-members" id="doc-define-members"></a><h2 id="header-doc-define-members" class="groupheader">Macro Definition Documentation</h2>
<a id="a3c3ba66fe2b547655c9e4b16a1ba519a" name="a3c3ba66fe2b547655c9e4b16a1ba519a"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a3c3ba66fe2b547655c9e4b16a1ba519a">&#9670;&#160;</a></span>AARU_MAGIC</h2>
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<td class="memname">#define AARU_MAGIC&#160;&#160;&#160;0x544D524655524141ULL</td>
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<p>Magic identifier for AaruFormat container (ASCII "AARUFRMT"). </p>
<p>Used in the primary header to assert correct file type. </p>
<p class="definition">Definition at line <a class="el" href="consts_8h_source.html#l00064">64</a> of file <a class="el" href="consts_8h_source.html">consts.h</a>.</p>
<p class="reference">Referenced by <a class="el" href="close_8c_source.html#l03995">aaruf_close()</a>, <a class="el" href="write_8c_source.html#l01383">aaruf_close_current_block()</a>, <a class="el" href="create_8c_source.html#l00279">aaruf_create()</a>, <a class="el" href="metadata_8c_source.html#l02099">aaruf_get_aaru_json_metadata()</a>, <a class="el" href="metadata_8c_source.html#l01944">aaruf_get_cicm_metadata()</a>, <a class="el" href="metadata_8c_source.html#l02476">aaruf_get_comments()</a>, <a class="el" href="metadata_8c_source.html#l02404">aaruf_get_creator()</a>, <a class="el" href="metadata_8c_source.html#l03178">aaruf_get_drive_firmware_revision()</a>, <a class="el" href="metadata_8c_source.html#l02968">aaruf_get_drive_manufacturer()</a>, <a class="el" href="metadata_8c_source.html#l03038">aaruf_get_drive_model()</a>, <a class="el" href="metadata_8c_source.html#l03108">aaruf_get_drive_serial_number()</a>, <a class="el" href="dump_8c_source.html#l00186">aaruf_get_dumphw()</a>, <a class="el" href="metadata_8c_source.html#l00094">aaruf_get_geometry()</a>, <a class="el" href="metadata_8c_source.html#l03634">aaruf_get_image_info()</a>, <a class="el" href="metadata_8c_source.html#l02825">aaruf_get_media_barcode()</a>, <a class="el" href="metadata_8c_source.html#l02616">aaruf_get_media_manufacturer()</a>, <a class="el" href="metadata_8c_source.html#l02686">aaruf_get_media_model()</a>, <a class="el" href="metadata_8c_source.html#l02896">aaruf_get_media_part_number()</a>, <a class="el" href="metadata_8c_source.html#l02337">aaruf_get_media_sequence()</a>, <a class="el" href="metadata_8c_source.html#l02756">aaruf_get_media_serial_number()</a>, <a class="el" href="metadata_8c_source.html#l02546">aaruf_get_media_title()</a>, <a class="el" href="metadata_8c_source.html#l03417">aaruf_get_negative_sectors()</a>, <a class="el" href="metadata_8c_source.html#l03552">aaruf_get_overflow_sectors()</a>, <a class="el" href="tape_8c_source.html#l00569">aaruf_get_tape_file()</a>, <a class="el" href="tape_8c_source.html#l00982">aaruf_get_tape_partition()</a>, <a class="el" href="optical_8c_source.html#l00281">aaruf_get_tracks()</a>, <a class="el" href="metadata_8c_source.html#l03292">aaruf_get_user_sectors()</a>, <a class="el" href="identify_8c_source.html#l00163">aaruf_identify_stream()</a>, <a class="el" href="open_8c_source.html#l00125">aaruf_open()</a>, <a class="el" href="read_8c_source.html#l00085">aaruf_read_media_tag()</a>, <a class="el" href="read_8c_source.html#l00250">aaruf_read_sector()</a>, <a class="el" href="read_8c_source.html#l00815">aaruf_read_sector_long()</a>, <a class="el" href="read_8c_source.html#l01463">aaruf_read_sector_tag()</a>, <a class="el" href="read_8c_source.html#l00663">aaruf_read_track_sector()</a>, <a class="el" href="metadata_8c_source.html#l02258">aaruf_set_aaru_json_metadata()</a>, <a class="el" href="metadata_8c_source.html#l00607">aaruf_set_comments()</a>, <a class="el" href="metadata_8c_source.html#l00493">aaruf_set_creator()</a>, <a class="el" href="metadata_8c_source.html#l01793">aaruf_set_drive_firmware_revision()</a>, <a class="el" href="metadata_8c_source.html#l01412">aaruf_set_drive_manufacturer()</a>, <a class="el" href="metadata_8c_source.html#l01534">aaruf_set_drive_model()</a>, <a class="el" href="metadata_8c_source.html#l01658">aaruf_set_drive_serial_number()</a>, <a class="el" href="dump_8c_source.html#l00531">aaruf_set_dumphw()</a>, <a class="el" href="metadata_8c_source.html#l00229">aaruf_set_geometry()</a>, <a class="el" href="metadata_8c_source.html#l01176">aaruf_set_media_barcode()</a>, <a class="el" href="metadata_8c_source.html#l00832">aaruf_set_media_manufacturer()</a>, <a class="el" href="metadata_8c_source.html#l00939">aaruf_set_media_model()</a>, <a class="el" href="metadata_8c_source.html#l01297">aaruf_set_media_part_number()</a>, <a class="el" href="metadata_8c_source.html#l00363">aaruf_set_media_sequence()</a>, <a class="el" href="metadata_8c_source.html#l01054">aaruf_set_media_serial_number()</a>, <a class="el" href="metadata_8c_source.html#l00720">aaruf_set_media_ti
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<h2 class="memtitle"><span class="permalink"><a href="#adbbd4387273589f1c76a5f5786607013">&#9670;&#160;</a></span>AARUF_VERSION</h2>
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<td class="memname">#define AARUF_VERSION&#160;&#160;&#160;2</td>
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<p>Current image format major version (incompatible changes bump this). </p>
<p>Readers should reject headers with a higher number unless explicitly forward compatible. </p>
<p class="definition">Definition at line <a class="el" href="consts_8h_source.html#l00068">68</a> of file <a class="el" href="consts_8h_source.html">consts.h</a>.</p>
<p class="reference">Referenced by <a class="el" href="identify_8c_source.html#l00163">aaruf_identify_stream()</a>, and <a class="el" href="open_8c_source.html#l00125">aaruf_open()</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#ac837e146bff4d0f3603e4a9e444358c6">&#9670;&#160;</a></span>AARUF_VERSION_V1</h2>
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<td class="memname">#define AARUF_VERSION_V1&#160;&#160;&#160;1</td>
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<p>First on‑disk version (C# implementation). </p>
<p>Quirk: CRC64 values were stored byte‑swapped relative to ECMA‑182 canonical output. </p>
<p class="definition">Definition at line <a class="el" href="consts_8h_source.html#l00071">71</a> of file <a class="el" href="consts_8h_source.html">consts.h</a>.</p>
<p class="reference">Referenced by <a class="el" href="verify_8c_source.html#l00130">aaruf_verify_image()</a>, <a class="el" href="data_8c_source.html#l00071">process_data_block()</a>, <a class="el" href="blocks_2dump_8c_source.html#l00108">process_dumphw_block()</a>, <a class="el" href="optical_8c_source.html#l00111">process_tracks_block()</a>, <a class="el" href="index__v1_8c_source.html#l00225">verify_index_v1()</a>, <a class="el" href="index__v2_8c_source.html#l00227">verify_index_v2()</a>, and <a class="el" href="index__v3_8c_source.html#l00408">verify_index_v3()</a>.</p>
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<a id="ad2fdced5805aa0364f1c5b073f81dd76" name="ad2fdced5805aa0364f1c5b073f81dd76"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ad2fdced5805aa0364f1c5b073f81dd76">&#9670;&#160;</a></span>AARUF_VERSION_V2</h2>
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<td class="memname">#define AARUF_VERSION_V2&#160;&#160;&#160;2</td>
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<p>Second on‑disk version (C implementation). </p>
<p>Introduced: extended header (GUID, feature bitmaps), hierarchical DDT v2, improved index (v2/v3), multi‑codec compression, refined metadata blocks. </p>
<p class="definition">Definition at line <a class="el" href="consts_8h_source.html#l00075">75</a> of file <a class="el" href="consts_8h_source.html">consts.h</a>.</p>
<p class="reference">Referenced by <a class="el" href="create_8c_source.html#l00279">aaruf_create()</a>, and <a class="el" href="open_8c_source.html#l00125">aaruf_open()</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a0b24c62ef1b78b72b9f4a42918f39e13">&#9670;&#160;</a></span>CD_DFIX_MASK</h2>
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<td class="memname">#define CD_DFIX_MASK&#160;&#160;&#160;0x00FFFFFFU</td>
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<p>Mask for extracting positional index (lower 24 bits) in Compact Disc suffix/prefix deduplicated block entries. </p>
<p class="definition">Definition at line <a class="el" href="consts_8h_source.html#l00102">102</a> of file <a class="el" href="consts_8h_source.html">consts.h</a>.</p>
<p class="reference">Referenced by <a class="el" href="read_8c_source.html#l00815">aaruf_read_sector_long()</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#aa64757ba31a320f675fca1062111180f">&#9670;&#160;</a></span>CD_XFIX_MASK</h2>
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<td class="memname">#define CD_XFIX_MASK&#160;&#160;&#160;0xFF000000U</td>
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<p>Mask for extracting correction / fix flags in Compact Disc suffix/prefix DDT entries. </p>
<p>High 8 bits store status (see <a class="el" href="enums_8h.html#a74e216af87b18a5fbf0204a52dd1bba0" title="Acquisition / content status for one or more sectors.">SectorStatus</a> / <a class="el" href="enums_8h.html#ab72dc399e3946b3c40a5ad8c8e3254b7" title="Flags describing Compact Disc sector fix-up status.">CdFixFlags</a> relationships). </p>
<p class="definition">Definition at line <a class="el" href="consts_8h_source.html#l00100">100</a> of file <a class="el" href="consts_8h_source.html">consts.h</a>.</p>
<p class="reference">Referenced by <a class="el" href="read_8c_source.html#l00815">aaruf_read_sector_long()</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a13ba7a163f45ee45c977d63c408539ca">&#9670;&#160;</a></span>DIC_MAGIC</h2>
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<td class="memname">#define DIC_MAGIC&#160;&#160;&#160;0x544D52464D434944ULL</td>
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<p>Magic identifier for legacy DiscImageChef container (ASCII "DICMFRMT"). </p>
<p>Retained for backward compatibility / migration tooling. </p>
<p class="definition">Definition at line <a class="el" href="consts_8h_source.html#l00061">61</a> of file <a class="el" href="consts_8h_source.html">consts.h</a>.</p>
<p class="reference">Referenced by <a class="el" href="identify_8c_source.html#l00163">aaruf_identify_stream()</a>, and <a class="el" href="open_8c_source.html#l00125">aaruf_open()</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a25fd08252b97a0230d3efc899bddd240">&#9670;&#160;</a></span>LZMA_PROPERTIES_LENGTH</h2>
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<td class="memname">#define LZMA_PROPERTIES_LENGTH&#160;&#160;&#160;5</td>
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<p>Size in bytes of the fixed LZMA properties header (lc/lp/pb + dictionary size). </p>
<p class="definition">Definition at line <a class="el" href="consts_8h_source.html#l00082">82</a> of file <a class="el" href="consts_8h_source.html">consts.h</a>.</p>
<p class="reference">Referenced by <a class="el" href="write_8c_source.html#l01383">aaruf_close_current_block()</a>, <a class="el" href="read_8c_source.html#l00250">aaruf_read_sector()</a>, <a class="el" href="ddt__v2_8c_source.html#l00724">decode_ddt_multi_level_v2()</a>, <a class="el" href="data_8c_source.html#l00071">process_data_block()</a>, <a class="el" href="ddt__v1_8c_source.html#l00085">process_ddt_v1()</a>, <a class="el" href="ddt__v2_8c_source.html#l00096">process_ddt_v2()</a>, <a class="el" href="ddt__v2_8c_source.html#l01092">set_ddt_multi_level_v2()</a>, <a class="el" href="close_8c_source.html#l00077">write_cached_secondary_ddt()</a>, <a class="el" href="close_8c_source.html#l01808">write_dvd_long_sector_blocks()</a>, <a class="el" href="close_8c_source.html#l02245">write_dvd_title_key_decrypted_block()</a>, <a class="el" href="close_8c_source.html#l02409">write_media_tags()</a>, <a class="el" href="close_8c_source.html#l00850">write_mode2_subheaders_block()</a>, <a class="el" href="close_8c_source.html#l00966">write_sector_prefix()</a>, <a class="el" href="close_8c_source.html#l01206">write_sector_prefix_ddt()</a>, <a class="el" href="close_8c_source.html#l01508">write_sector_subchannel()</a>, <a class="el" href="close_8c_source.html#l01088">write_sector_suffix()</a>, <a class="el" href="close_8c_source.html#l01350">write_sector_suffix_ddt()</a>, and <a class="el" href="close_8c_source.html#l00369">write_single_level_ddt()</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a6c8469dfe973ac952cf40394bd2c160b">&#9670;&#160;</a></span>MAX_CACHE_SIZE</h2>
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<td class="memname">#define MAX_CACHE_SIZE&#160;&#160;&#160;536870912ULL</td>
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<p>Maximum read cache size (bytes). </p>
<p>512 MiB chosen to prevent excessive resident memory while still enabling efficient sequential and moderate random access patterns. </p>
<p class="definition">Definition at line <a class="el" href="consts_8h_source.html#l00079">79</a> of file <a class="el" href="consts_8h_source.html">consts.h</a>.</p>
<p class="reference">Referenced by <a class="el" href="create_8c_source.html#l00279">aaruf_create()</a>, and <a class="el" href="open_8c_source.html#l00125">aaruf_open()</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#ac97c436bf02e6e7e7daea67d374f03cd">&#9670;&#160;</a></span>MAX_DDT_ENTRY_CACHE</h2>
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<td class="memname">#define MAX_DDT_ENTRY_CACHE&#160;&#160;&#160;16000000</td>
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<p>Maximum number of cached DDT entry descriptors retained in memory for fast duplicate detection. </p>
<p>At 16,000,000 entries with a compact structure, this caps hash_map overhead while covering large images. (Approx memory just for lookup bookkeeping: ~16 bytes * N ≈ 256 MB worst case; typical effective &lt;50% of cap.) </p>
<p class="definition">Definition at line <a class="el" href="consts_8h_source.html#l00087">87</a> of file <a class="el" href="consts_8h_source.html">consts.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a207a31e861ea8e3a4f5ef52c13b42b3d">&#9670;&#160;</a></span>MAX_FLAKE_BLOCK</h2>
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<td class="memname">#define MAX_FLAKE_BLOCK&#160;&#160;&#160;4608</td>
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<p>FLAC maximum block size used for encoding audio sectors. </p>
<p>Empirically &gt;4608 samples yields diminishing compression returns and higher decode latency. </p>
<p class="definition">Definition at line <a class="el" href="consts_8h_source.html#l00094">94</a> of file <a class="el" href="consts_8h_source.html">consts.h</a>.</p>
<p class="reference">Referenced by <a class="el" href="write_8c_source.html#l01383">aaruf_close_current_block()</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a3fd3617b4eb7e9548e0fd0ca8990e44a">&#9670;&#160;</a></span>MIN_FLAKE_BLOCK</h2>
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<td class="memname">#define MIN_FLAKE_BLOCK&#160;&#160;&#160;256</td>
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<p>FLAC minimum block size. </p>
<p>CUETools.Codecs.FLAKE does not accept blocks smaller than 256 samples. </p>
<p class="definition">Definition at line <a class="el" href="consts_8h_source.html#l00096">96</a> of file <a class="el" href="consts_8h_source.html">consts.h</a>.</p>
<p class="reference">Referenced by <a class="el" href="write_8c_source.html#l01383">aaruf_close_current_block()</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a44401191f17a7c09a05e57ff9e5cff24">&#9670;&#160;</a></span>SAMPLES_PER_SECTOR</h2>
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<td class="memname">#define SAMPLES_PER_SECTOR&#160;&#160;&#160;588</td>
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<p>Red Book (CD‑DA) PCM samples per 2352‑byte sector: 44,100 Hz / 75 sectors per second = 588 samples. </p>
<p class="definition">Definition at line <a class="el" href="consts_8h_source.html#l00090">90</a> of file <a class="el" href="consts_8h_source.html">consts.h</a>.</p>
<p class="reference">Referenced by <a class="el" href="write_8c_source.html#l01383">aaruf_close_current_block()</a>.</p>
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