vgmstream/src/meta/fsb5_fev.c

#include "meta.h"
#include "../coding/coding.h"

/* FEV+FSB5 container [Just Cause 3 (PC), Shantae: Half-Genie Hero (Switch)] */
VGMSTREAM* init_vgmstream_fsb5_fev_bank(STREAMFILE* sf) {
    VGMSTREAM * vgmstream = NULL;
    STREAMFILE *temp_sf = NULL;
    off_t subfile_offset, chunk_offset, first_offset = 0x0c;
    size_t subfile_size, chunk_size;


    /* checks */
    if (!check_extensions(sf, "bank"))
        goto fail;

    if (read_32bitBE(0x00,sf) != 0x52494646) /* "RIFF" */
        goto fail;
    if (read_32bitBE(0x08,sf) != 0x46455620) /* "FEV " */
        goto fail;

    /* .fev is an event format referencing various external .fsb, but FMOD can bake .fev and .fsb to
     * form a .bank, which is the format we support here (regular .fev is complex and not very interesting).
     * Format is RIFF with FMT (main), LIST (config) and SND (FSB5 data), we want the FSB5 offset inside LIST */
    if (!find_chunk_le(sf, 0x4C495354,first_offset,0, &chunk_offset,NULL)) /* "LIST" */
        goto fail;

    if (read_32bitBE(chunk_offset+0x00,sf) != 0x50524F4A || /* "PROJ" */
        read_32bitBE(chunk_offset+0x04,sf) != 0x424E4B49)   /* "BNKI" */
        goto fail; /* event .fev has "OBCT" instead of "BNKI" */

    /* inside BNKI is a bunch of LIST each with event subchunks and finally fsb offset */
    first_offset = chunk_offset + 0x04;
    if (!find_chunk_le(sf, 0x534E4448,first_offset,0, &chunk_offset,&chunk_size)) /* "SNDH" */
        goto fail;

    /* 0x00: unknown (version? ex LE: 0x00080003, 0x00080005) */
    {
        int banks;

        /* multiple banks is possible but rare (only seen an extra "Silence" FSB5 in Guacamelee 2 (Switch),
         *  which on PC is a regular subsong in the only FSB5) */
        banks = (chunk_size - 0x04) / 0x08;
        VGM_ASSERT(banks > 1, "FSB5FEV: multiple banks found\n");

        /* Could try to set stream index based on FSB subsong ranges, also fixing num_streams and stream_index
         * kinda involved and hard to test so for now just ignore it and use first offset */

        if (banks > 2)
            goto fail;
        if (banks == 2) {
            off_t temp_offset  = read_32bitLE(chunk_offset + 0x04 + 0x08*1 + 0x00,sf);
            //size_t temp_size = read_32bitLE(chunk_offset + 0x04 + 0x08*1 + 0x04,sf);

            int bank_subsongs = read_32bitLE(temp_offset + 0x08,sf);
            if (bank_subsongs != 1) goto fail;
        }
    }

    subfile_offset  = read_32bitLE(chunk_offset+0x04,sf);
    subfile_size    = read_32bitLE(chunk_offset+0x08,sf);

    temp_sf = setup_subfile_streamfile(sf, subfile_offset,subfile_size, "fsb");
    if (!temp_sf) goto fail;

    vgmstream = init_vgmstream_fsb5(temp_sf);
    close_streamfile(temp_sf);

    return vgmstream;

fail:
    close_streamfile(temp_sf);
    close_vgmstream(vgmstream);
    return NULL;
}