Differences

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--- vmgi [2014/05/16 14:04]
beandog created
+++ vmgi [2015/01/15 23:29] (current)
beandog
@@ Line 3: / Line 3: @@
   * [[DVD Structure]]
   * [[VMG]]
+The VMGI is the primary [[IFO]] containing all the metadata about the entire DVD.  Or as I often call it, IFO zero.
+Files are a normal IFO file, the first one on the disc, being ''VIDEO_TS.IFO'' and ''VIDEO_TS.BUP''.
+  * [[http://stnsoft.com/DVD/ifo.html|Video Manager and Video Title Set IFO file headers]] - data in both VMG and VTS IFOs
+  * [[http://stnsoft.com/DVD/ifo_vmg.html|Video Manager IFO]] - data specific **to the one** VMG IFO
+==== VMG IFO Contents: libdvdread ====
+See ''ifoOpenVMGI()'' in ''ifo_read.h''.
+See ''vmgi_mat_t'' struct in ''ifo_types.h''.
+<code>
+ifo_handle_t *ifo_zero;
+ifo_zero = ifoOpen(dvdread_dvd, 0);
+</code>
+** VMG ID **
+  * Example: DVDVIDEO-VMG
+<code>
+char *id;
+id = ifo_zero->vmgi_mat->vmg_identifier;
+</code>
+** Last sector of VMG set **
+The last sector of the BUP.
+<code>
+uint32t i;
+i = ifo_zero->vmgi_mat->vmg_last_sector;
+</code>
+** Last sector of IFO **
+Current IFO?  Not sure...
+<code>
+uint32t i;
+i = ifo_zero->vmgi_mat->vmgi_last_sector;
+</code>
+** Version number **
+  * [[http://stnsoft.com/DVD/ifo.html#ver]]
+<code>
+uint8t i;
+i = ifo_zero->vmgi_mat->specification_version;
+</code>
+** VMG category **
+<code>
+uint32_t i;
+i = ifo_zero->vmgi_mat->vmg_category;
+</code>
+** Number of volumes **
+Not sure if I've seen this one yet, where it is positvely set (todo: search IFOs).  It's the number of volumes for an entire set of the DVDs that this one is a part of a collection.
+<code>
+uint16_t i;
+i = ifo_zero->vmgi_mat->vmg_nr_of_volumes
+</code>
+** Volume number **
+<code>
+uint16_t i;
+i = ifo_zero->vmgi_mat->vmg_this_volume_nr;
+</code>
+** Disc side **
+This should obviously be a 1 or a 2.
+<code>
+uint8t i;
+i = ifo_zero->vmgi_mat->disc_side;
+</code>
+** Number of title sets **
+Number of VTSs, aka IFOs.  **For debugging**, this number should match the actual amount of IFOs on a DVD.
+<code>
+uint16_t i;
+i = ifo_zero->vmgi_mat->vmg_nr_of_title_sets;
+</code>
+** Provider ID **
+Example: ''DEFENDERS_OF_THE_EARTH_V2D2A''.  Often blank.  32 characters not including a NULL terminator.
+<code>
+char *id;
+id = ifo_zero->vmgi_mat->provider_identifier;
+</code>
+** VMG POS **
+Dunno what this one is.  8-bytes.
+<code>
+uint64_t i;
+i = ifo_zero->vmgi_mat->vmg_pos_code;
+</code>
+** Last byte of VMG IFO (IFO Zero) **
+<code>
+uint32_t i;
+i = ifo_zero->vmgi_mat->vmgi_last_byte;
+</code>
+** Start address of first PGC **
+First Play program chain.
+  * [[http://stnsoft.com/DVD/pgc.html]]
+<code>
+uint32_t i;
+i = ifo_zero->vmgi_mat->first_play_pgc;
+</code>
+** Start sector of menu VOB **
+Dunno what this is yet.
+<code>
+uint32_t i;
+i = ifo_zero->vmgi_mat->vmgm_vobs;
+</code>
+** Sector pointer to TT_SRPT, table of titles **
+  * [[http://stnsoft.com/DVD/ifo_vmg.html#tt]]
+<code>
+uint32_t i;
+i = ifo_zero->vmgi_mat->tt_srpt;
+</code>
+** Sector pointer to Menu Program Chain Table (VMGM_PGCI_UT) **
+  * [[http://stnsoft.com/DVD/ifo_vmg.html#pgciut]]
+<code>
+uint32_t i;
+i = ifo_zero->vmgi_mat->vmgm_pgci_ut;
+</code>
+** Sector pointer to Parental Management masks (VMG_PTL_MAIT) **
+  * [[http://stnsoft.com/DVD/ifo_vmg.html#mait]]
+<code>
+uint32_t i;
+i = ifo_zero->vmgi_mat->ptl_mait;
+</code>
+** Sector pointer to copies of VTS audio/sub-picture attributes (VMG_VTS_ATRT) **
+  * [[http://stnsoft.com/DVD/ifo_vmg.html#atrt]]
+<code>
+uint32_t i;
+i = ifo_zero->vmgi_mat->vts_atrt;
+</code>
+** Sector pointer to VMG_TXTDT_MG **
+Text data.  No idea what this one is.
+<code>
+uint32_t i;
+i = ifo_zero->vmgi_mat->txtdt_mgi;
+</code>
+** Sector pointer to menu cell address table (VMGM_C_ADT) **
+  * [[http://stnsoft.com/DVD/ifo.html#c_adt]]
+<code>
+uint32_t i;
+i = ifo_zero->vmgi_mat->vmgm_c_adt;
+</code>
+** Sector pointer to menu VOBU address map (VMGM_VOBU_ADMAP) **
+  * [[http://stnsoft.com/DVD/ifo.html#vam]]
+<code>
+uint32_t i;
+i = ifo_zero->vmgi_mat->vmgm_vobu_admap;
+</code>
+** Video attributes of menu VOBs (VMGM_VOBS) **
+  * [[http://stnsoft.com/DVD/ifo.html#vidatt]]
+<code>
+video_attr_t *a;
+a = ifo_zero->vmgi_mat->vmgm_video_attr;
+</code>
+** Number of audio streams in menu VOBs (VMGM_VOBS) **
+Should be 0 or 1 (**debugging checks**).
+<code>
+uint8_t i;
+i = ifo_zero->vmgi_mat->nr_of_vmgm_audio_streams;
+</code>
+** Audio attributes of menu VOBs (VMGM_VOBS) **
+  * [[http://stnsoft.com/DVD/ifo.html#maudatt]]
+For //channels// the most common integer value (from my findings) is 0 or 1.  Need to find out if that means integer + 1 (so, 0 = mono, 1 = stereo) or what.
+<code>
+audio_attr_t *a;
+a = ifo_zero->vmgi_mat->vmgm_audio_attr;
+</code>
+** Number of subpicture streams in menu VOBs (VMGM_VOBS) **
+Should be 0 or 1 (**debugging checks**).
+<code>
+uint8_t i;
+i = ifo_zero->vmgi_mat->nr_of_vmgm_subp_streams;
+</code>
+** Subpicture attributes of menu VOBs (VMGM_VOBS) **
+<code>
+subp_attr_t *a;
+a = ifo_zero->vmgi_mat->vmgm_subp_attr;
+</code>

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