Add Wwise .bnk FX mini-format [Borderlands 2 (X360)]

src/formats.c

@@ -1283,6 +1283,7 @@ static const meta_info meta_info_list[] = {
         {meta_TGC,                  "Tiger Game.com .4 header"},
         {meta_KWB,                  "Koei Tecmo WaveBank header"},
         {meta_LRMD,                 "Sony LRMD header"},
+        {meta_WWISE_FX,             "Audiokinetic Wwise FX header"},
 
 };
 

src/meta/bkhd.c

@@ -42,12 +42,19 @@ VGMSTREAM* init_vgmstream_bkhd(STREAMFILE* sf) {
     subfile_offset  = read_u32(offset + 0x04, sf) + data_offset;
     subfile_size    = read_u32(offset + 0x08, sf);
 
-
+    //;VGM_LOG("BKHD: %lx, %x\n", subfile_offset, subfile_size);
     temp_sf = setup_subfile_streamfile(sf, subfile_offset, subfile_size, "wem");
     if (!temp_sf) goto fail;
 
+    subfile_id = read_u32(0x00, temp_sf);
+    if (subfile_id == 0x52494646 || subfile_id == 0x52494658) { /* "RIFF" / "RIFX" */
         vgmstream = init_vgmstream_wwise(temp_sf);
         if (!vgmstream) goto fail;
+    }
+    else {
+        vgmstream = init_vgmstream_bkhd_fx(temp_sf);
+        if (!vgmstream) goto fail;
+    }
 
     vgmstream->num_streams = total_subsongs;
     snprintf(vgmstream->stream_name, STREAM_NAME_SIZE, "%u", subfile_id);
@@ -60,3 +67,60 @@ fail:
     close_vgmstream(vgmstream);
     return NULL;
 }
+
+
+/* BKHD mini format, probably from a generator plugin [Borderlands 2 (X360)] */
+VGMSTREAM* init_vgmstream_bkhd_fx(STREAMFILE* sf) {
+    VGMSTREAM* vgmstream = NULL;
+    off_t start_offset, data_size;
+    int big_endian, loop_flag, channels, sample_rate, entries;
+    uint32_t (*read_u32)(off_t,STREAMFILE*);
+
+
+    /* checks */
+    if (!check_extensions(sf,"wem,bnk")) /* assumed */
+        goto fail;
+    big_endian = guess_endianness32bit(0x00, sf);
+    read_u32 = big_endian ? read_u32be : read_u32le;
+
+    if (read_u32(0x00, sf) != 0x0400) /* codec? */
+        goto fail;
+    if (read_u32(0x04, sf) != 0x0800) /* codec? */
+        goto fail;
+    sample_rate = read_u32(0x08, sf);
+    channels    = read_u32(0x0c, sf);
+    /* 0x10: some id or small size? */
+    /* 0x14/18: some float? */
+    entries     = read_u32(0x1c, sf);
+    /* 0x20 data size / 0x10 */
+    if (read_u8(0x24, sf) != 4) /* bps */
+        goto fail;
+    /* 0x30: unknown table of 16b that goes up and down */
+
+    start_offset = 0x30 + align_size_to_block(entries * 0x02, 0x10);
+    data_size = get_streamfile_size(sf) - start_offset;
+    loop_flag = 0;
+
+    /* output sounds a bit funny, maybe not an actual stream but parts using the table */
+
+    /* build the VGMSTREAM */
+    vgmstream = allocate_vgmstream(channels, loop_flag);
+    if (!vgmstream) goto fail;
+
+    vgmstream->meta_type = meta_WWISE_FX;
+    vgmstream->sample_rate = sample_rate;
+
+    vgmstream->coding_type = coding_PCMFLOAT;
+    vgmstream->layout_type = layout_interleave;
+    vgmstream->codec_endian = big_endian;
+    vgmstream->interleave_block_size = 0x4;
+
+    vgmstream->num_samples = pcm_bytes_to_samples(data_size, channels, 32);
+
+    if (!vgmstream_open_stream(vgmstream,sf,start_offset))
+        goto fail;
+    return vgmstream;
+fail:
+    close_vgmstream(vgmstream);
+    return NULL;
+}

src/meta/meta.h

@@ -889,5 +889,6 @@ VGMSTREAM * init_vgmstream_kwb(STREAMFILE* sf);
 VGMSTREAM * init_vgmstream_lrmd(STREAMFILE* sf);
 
 VGMSTREAM* init_vgmstream_bkhd(STREAMFILE* sf);
+VGMSTREAM* init_vgmstream_bkhd_fx(STREAMFILE* sf);
 
 #endif /*_META_H*/

src/vgmstream.c

@@ -491,6 +491,7 @@ VGMSTREAM * (*init_vgmstream_functions[])(STREAMFILE *streamFile) = {
     init_vgmstream_kwb,
     init_vgmstream_lrmd,
     init_vgmstream_bkhd,
+    init_vgmstream_bkhd_fx,
 
     /* lowest priority metas (should go after all metas, and TXTH should go before raw formats) */
     init_vgmstream_txth,            /* proper parsers should supersede TXTH, once added */

src/vgmstream.h

@@ -724,6 +724,7 @@ typedef enum {
     meta_TGC,
     meta_KWB,
     meta_LRMD,
+    meta_WWISE_FX,
 } meta_t;
 
 /* standard WAVEFORMATEXTENSIBLE speaker positions */