vgmstream/src/meta/aax.c

#include "../vgmstream.h"
#include "meta.h"
#include "../util.h"

typedef struct _AAXSTREAMFILE
{
  STREAMFILE sf;
  STREAMFILE *real_file;
  off_t start_physical_offset;
  size_t file_size;
} AAXSTREAMFILE;

static STREAMFILE *open_aax_with_STREAMFILE(STREAMFILE *file,off_t start_offset,size_t file_size);

struct utf_query
{
    /* if 0 */
    const char *name;
    int index;
};

struct offset_size_pair
{
    uint32_t offset;
    uint32_t size;
};

struct utf_query_result
{
    int valid;  /* table is valid */
    int found;
    int type;   /* one of COLUMN_TYPE_* */
    union
    {
        uint64_t value_u64;
        uint32_t value_u32;
        uint16_t value_u16;
        uint8_t value_u8;
        float value_float;
        struct offset_size_pair value_data;
        uint32_t value_string;
    } value;

    /* info for the queried table */
    uint32_t rows;
    uint32_t name_offset;
    uint32_t string_table_offset;
    uint32_t data_offset;
};

static struct utf_query_result analyze_utf(STREAMFILE *infile, long offset,
        const struct utf_query *query);

static struct utf_query_result query_utf(STREAMFILE *infile, long offset,
        const struct utf_query *query);

static struct utf_query_result query_utf_nofail(STREAMFILE *infile, const long offset,
        const struct utf_query *query, int *error);

static struct utf_query_result query_utf_key(STREAMFILE *infile, const long offset,
        int index, const char *name, int *error);

static uint8_t query_utf_1byte(STREAMFILE *infile, const long offset,
        int index, const char *name, int *error);

static struct offset_size_pair query_utf_data(STREAMFILE *infile, const long offset,
        int index, const char *name, int *error);

#define COLUMN_STORAGE_MASK         0xf0
#define COLUMN_STORAGE_PERROW       0x50
#define COLUMN_STORAGE_CONSTANT     0x30
#define COLUMN_STORAGE_ZERO         0x10

#define COLUMN_TYPE_MASK            0x0f
#define COLUMN_TYPE_DATA            0x0b
#define COLUMN_TYPE_STRING          0x0a
#define COLUMN_TYPE_FLOAT           0x08
#define COLUMN_TYPE_8BYTE           0x06
#define COLUMN_TYPE_4BYTE           0x04
#define COLUMN_TYPE_2BYTE2          0x03
#define COLUMN_TYPE_2BYTE           0x02
#define COLUMN_TYPE_1BYTE2          0x01
#define COLUMN_TYPE_1BYTE           0x00

struct utf_column_info
{
    uint8_t type;
    const char *column_name;
    long constant_offset;
};

struct utf_table_info
{
    long table_offset;
    uint32_t table_size;
    uint32_t schema_offset;
    uint32_t rows_offset;
    uint32_t string_table_offset;
    uint32_t data_offset;
    const char *string_table;
    const char *table_name;
    uint16_t columns;
    uint16_t row_width;
    uint32_t rows;

    const struct utf_column_info *schema;
};


/* Actual AAX init fcn */
VGMSTREAM * init_vgmstream_aax(STREAMFILE *streamFile) {
    
	VGMSTREAM * vgmstream = NULL;
    STREAMFILE * streamFileAAX = NULL;
    STREAMFILE * streamFileADX = NULL;
    char filename[PATH_LIMIT];
    off_t *segment_offset = NULL;
    off_t *segment_size = NULL;
    int32_t sample_count;
    int table_error = 0;

    int loop_flag = 0;
    int32_t loop_start_sample=0;
    int32_t loop_end_sample=0;
    int loop_segment = 0;

    aax_codec_data *data = NULL;

    const long AAX_offset = 0;

    int channel_count = 0, segment_count;
    int sample_rate = 0;

	int i;


    long aax_data_offset;

    /* check extension, case insensitive */
    streamFile->get_name(streamFile,filename,sizeof(filename));
    if (strcasecmp("aax",filename_extension(filename))) goto fail;
    
    /* get AAX entry count, data offset */
    {
        struct utf_query_result result;
        long aax_string_table_offset;
        long aax_string_table_size;
       
        result = query_utf_nofail(streamFile, AAX_offset, NULL, &table_error);
        if (table_error) goto fail;
        segment_count = result.rows;
        aax_string_table_offset = AAX_offset + 8 + result.string_table_offset;
        aax_data_offset = AAX_offset + 8 + result.data_offset;
        aax_string_table_size = aax_data_offset - aax_string_table_offset;

        if (result.name_offset+4 > aax_string_table_size) goto fail;
        if (read_32bitBE(aax_string_table_offset + result.name_offset,
                    streamFile) != 0x41415800) /* "AAX\0" */
            goto fail;
    }

    segment_offset = calloc(segment_count,sizeof(off_t));
    if (!segment_offset)
        goto fail;
    segment_size = calloc(segment_count,sizeof(off_t));
    if (!segment_size)
        goto fail;

    /* get offsets of constituent ADXs */
    for (i = 0; i < segment_count; i++)
    {
        struct offset_size_pair offset_size;
        offset_size = query_utf_data(streamFile, AAX_offset, i, "data", &table_error);
        if (table_error) goto fail;
        segment_offset[i] = aax_data_offset + offset_size.offset;
        segment_size[i] = offset_size.size;
    }

    streamFileAAX = streamFile->open(streamFile,filename,STREAMFILE_DEFAULT_BUFFER_SIZE);
    if (!streamFileAAX) goto fail;

    data = malloc(sizeof(aax_codec_data));
    if (!data) goto fail;
    data->segment_count = segment_count;
    data->adxs = malloc(sizeof(STREAMFILE *)*segment_count);
    if (!data->adxs) goto fail;
    for (i=0;i<segment_count;i++) {
        data->adxs[i] = NULL;
    }
    data->sample_counts = calloc(segment_count,sizeof(int32_t));
    if (!data->sample_counts) goto fail;

    /* for each segment */
    for (i = 0; i < segment_count; i++)
    {
        VGMSTREAM *adx;
        /*printf("try opening segment %d/%d %x\n",i,segment_count,segment_offset[i]);*/
        streamFileADX = open_aax_with_STREAMFILE(streamFileAAX,segment_offset[i],segment_size[i]);
        if (!streamFileADX) goto fail;
        adx = data->adxs[i] = init_vgmstream_adx(streamFileADX);
        if (!adx)
            goto fail;
        data->sample_counts[i] = adx->num_samples;
        close_streamfile(streamFileADX); streamFileADX = NULL;

        if (i == 0)
        {
            channel_count = adx->channels;
            sample_rate = adx->sample_rate;
        }
        else
        {
            if (channel_count != adx->channels)
                goto fail;
            if (sample_rate != adx->sample_rate)
                goto fail;
        }

        if (adx->loop_flag != 0)
            goto fail;

        /* save start things so we can restart for seeking/looping */
        /* copy the channels */
        memcpy(adx->start_ch,adx->ch,sizeof(VGMSTREAMCHANNEL)*adx->channels);
        /* copy the whole VGMSTREAM */
        memcpy(adx->start_vgmstream,adx,sizeof(VGMSTREAM));

    }

    sample_count = 0;
    loop_flag = 0;
    for (i = 0; i < segment_count; i++)
    {
        int segment_loop_flag = query_utf_1byte(streamFile, AAX_offset, i,
                "lpflg", &table_error);
        if (table_error) segment_loop_flag = 0;

        if (!loop_flag && segment_loop_flag)
        {
            loop_start_sample = sample_count;
            loop_segment = i;
        }

        sample_count += data->sample_counts[i];

        if (!loop_flag && segment_loop_flag)
        {
            loop_end_sample = sample_count;
            loop_flag = 1;
        }
    }

    vgmstream = allocate_vgmstream(channel_count,loop_flag);

    vgmstream->num_samples = sample_count;
    vgmstream->sample_rate = sample_rate;

    vgmstream->loop_start_sample = loop_start_sample;
    vgmstream->loop_end_sample = loop_end_sample;

    vgmstream->coding_type = data->adxs[0]->coding_type;
    vgmstream->layout_type = layout_aax;
    vgmstream->meta_type = meta_AAX;

    vgmstream->ch[0].streamfile = streamFileAAX;
    data->current_segment = 0;
    data->loop_segment = loop_segment;

    vgmstream->codec_data = data;
    free(segment_offset);
    free(segment_size);

    return vgmstream;

    /* clean up anything we may have opened */
fail:
    if (streamFileAAX) close_streamfile(streamFileAAX);
    if (streamFileADX) close_streamfile(streamFileADX);
    if (vgmstream) close_vgmstream(vgmstream);
    if (segment_offset) free(segment_offset);
    if (segment_size) free(segment_size);
    if (data) {
        if (data->adxs)
        {
            int i;
            for (i=0;i<data->segment_count;i++)
                if (data->adxs)
                    close_vgmstream(data->adxs[i]);
            free(data->adxs);
        }
        if (data->sample_counts)
        {
            free(data->sample_counts);
        }
        free(data);
    }
    return NULL;
}

/* virtual file, a piece of the overall file */

static size_t read_aax(AAXSTREAMFILE *streamfile,uint8_t *dest,off_t offset,size_t length)
{
  /* truncate at end of logical file */
  if (offset+length > streamfile->file_size)
  {
      long signed_length = length;
      signed_length = streamfile->file_size - offset;
      if (signed_length < 0) signed_length = 0;
      length = signed_length;
  }
  return read_streamfile(dest,
          streamfile->start_physical_offset+offset,
          length,streamfile->real_file);
}

static void close_aax(AAXSTREAMFILE *streamfile)
{
    free(streamfile);
    return;
}

static size_t get_size_aax(AAXSTREAMFILE *streamfile)
{
  return 0;
}

static size_t get_offset_aax(AAXSTREAMFILE *streamfile)
{
  long offset = streamfile->real_file->get_offset(streamfile->real_file);
  offset -= streamfile->start_physical_offset;
  if (offset < 0) offset = 0;
  if (offset > streamfile->file_size) offset = streamfile->file_size;

  return offset;
}

static void get_name_aax(AAXSTREAMFILE *streamfile,char *buffer,size_t length)
{
  strncpy(buffer,"ARBITRARY.ADX",length);
  buffer[length-1]='\0';
}

static STREAMFILE *open_aax_impl(AAXSTREAMFILE *streamfile,const char * const filename,size_t buffersize) 
{
  AAXSTREAMFILE *newfile;
  if (strcmp(filename,"ARBITRARY.ADX"))
      return NULL;

  newfile = malloc(sizeof(AAXSTREAMFILE));
  if (!newfile)
      return NULL;
  memcpy(newfile,streamfile,sizeof(AAXSTREAMFILE));
  return &newfile->sf;
}

static STREAMFILE *open_aax_with_STREAMFILE(STREAMFILE *file,off_t start_offset,size_t file_size)
{
  AAXSTREAMFILE *streamfile = malloc(sizeof(AAXSTREAMFILE));

  if (!streamfile)
    return NULL;
  
  /* success, set our pointers */

  streamfile->sf.read = (void*)read_aax;
  streamfile->sf.get_size = (void*)get_size_aax;
  streamfile->sf.get_offset = (void*)get_offset_aax;
  streamfile->sf.get_name = (void*)get_name_aax;
  streamfile->sf.get_realname = (void*)get_name_aax;
  streamfile->sf.open = (void*)open_aax_impl;
  streamfile->sf.close = (void*)close_aax;
#ifdef PROFILE_STREAMFILE
  streamfile->sf.get_bytes_read = NULL;
  streamfile->sf.get_error_count = NULL;
#endif

  streamfile->real_file = file;
  streamfile->start_physical_offset = start_offset;
  streamfile->file_size = file_size;
  
  return &streamfile->sf;
}

/* @UTF table reading, abridged */
static struct utf_query_result analyze_utf(STREAMFILE *infile, const long offset, const struct utf_query *query)
{
    unsigned char buf[4];
    struct utf_table_info table_info;
    char *string_table = NULL;
    struct utf_column_info * schema = NULL;
    struct utf_query_result result;
    uint32_t table_name_string;
    int string_table_size;
    
    result.valid = 0;

    table_info.table_offset = offset;

    /* check header */
    {
        static const char UTF_signature[4] = "@UTF"; /* intentionally unterminated */
        if (4 != read_streamfile(buf, offset, 4, infile)) goto cleanup_error;
        if (memcmp(buf, UTF_signature, sizeof(UTF_signature)))
        {
            goto cleanup_error;
        }
    }

    /* get table size */
    table_info.table_size = read_32bitBE(offset+4, infile);

    table_info.schema_offset = 0x20;
    table_info.rows_offset = read_32bitBE(offset+8, infile);
    table_info.string_table_offset = read_32bitBE(offset+0xc,infile);
    table_info.data_offset = read_32bitBE(offset+0x10,infile);
    table_name_string = read_32bitBE(offset+0x14,infile);
    table_info.columns = read_16bitBE(offset+0x18,infile);
    table_info.row_width = read_16bitBE(offset+0x1a,infile);
    table_info.rows = read_32bitBE(offset+0x1c,infile);

    /* allocate for string table */
    string_table_size = table_info.data_offset-table_info.string_table_offset;
    string_table = malloc(string_table_size+1);
    if (!string_table) goto cleanup_error;
    table_info.string_table = string_table;
    memset(string_table, 0, string_table_size+1);

    /* load schema */
    schema = malloc(sizeof(struct utf_column_info) * table_info.columns);
    if (!schema) goto cleanup_error;

    {
        int i;
        long schema_current_offset = table_info.schema_offset;
        for (i = 0; i < table_info.columns; i++)
        {
            schema[i].type = read_8bit(schema_current_offset,infile);
            schema_current_offset ++;
            schema[i].column_name = string_table + read_32bitBE(schema_current_offset,infile);
            schema_current_offset += 4;

            if ((schema[i].type & COLUMN_STORAGE_MASK) == COLUMN_STORAGE_CONSTANT)
            {
                schema[i].constant_offset = schema_current_offset;
                switch (schema[i].type & COLUMN_TYPE_MASK)
                {
                    case COLUMN_TYPE_8BYTE:
                    case COLUMN_TYPE_DATA:
                        schema_current_offset+=8;
                        break;
                    case COLUMN_TYPE_STRING:
                    case COLUMN_TYPE_FLOAT:
                    case COLUMN_TYPE_4BYTE:
                        schema_current_offset+=4;
                        break;
                    case COLUMN_TYPE_2BYTE2:
                    case COLUMN_TYPE_2BYTE:
                        schema_current_offset+=2;
                        break;
                    case COLUMN_TYPE_1BYTE2:
                    case COLUMN_TYPE_1BYTE:
                        schema_current_offset++;
                        break;
                    default:
                        goto cleanup_error;
                }
            }
        }
    }

    table_info.schema = schema;

    /* read string table */
    read_streamfile((unsigned char *)string_table,
            table_info.string_table_offset+8+offset,
            string_table_size, infile);
    table_info.table_name = table_info.string_table+table_name_string;

    /* fill in the default stuff */
    result.found = 0;
    result.rows = table_info.rows;
    result.name_offset = table_name_string;
    result.string_table_offset = table_info.string_table_offset;
    result.data_offset = table_info.data_offset;

    /* explore the values */
    if (query) {
        int i, j;

        for (i = 0; i < table_info.rows; i++)
        {
            uint32_t row_offset =
                table_info.table_offset + 8 + table_info.rows_offset +
                i * table_info.row_width;
            const uint32_t row_start_offset = row_offset;

            if (query && i != query->index) continue;

            for (j = 0; j < table_info.columns; j++)
            {
                uint8_t type = table_info.schema[j].type;
                long constant_offset = table_info.schema[j].constant_offset;
                int constant = 0;

                int qthis = (query && i == query->index &&
                        !strcmp(table_info.schema[j].column_name, query->name));

                if (qthis)
                {
                    result.found = 1;
                    result.type = schema[j].type & COLUMN_TYPE_MASK;
                }

                switch (schema[j].type & COLUMN_STORAGE_MASK)
                {
                    case COLUMN_STORAGE_PERROW:
                        break;
                    case COLUMN_STORAGE_CONSTANT:
                        constant = 1;
                        break;
                    case COLUMN_STORAGE_ZERO:
                        if (qthis)
                        {
                            memset(&result.value, 0,
                                    sizeof(result.value));
                        }
                        continue;
                    default:
                        goto cleanup_error;
                }

                if (1)
                {
                    long data_offset;
                    int bytes_read;

                    if (constant)
                    {
                        data_offset = constant_offset;
                    }
                    else
                    {
                        data_offset = row_offset;
                    }

                    switch (type & COLUMN_TYPE_MASK)
                    {
                        case COLUMN_TYPE_STRING:
                            {
                                uint32_t string_offset;
                                string_offset = read_32bitBE(data_offset, infile);
                                bytes_read = 4;
                                if (qthis)
                                {
                                    result.value.value_string = string_offset;
                                }
                            }
                            break;
                        case COLUMN_TYPE_DATA:
                            {
                                uint32_t vardata_offset, vardata_size;

                                vardata_offset = read_32bitBE(data_offset, infile);
                                vardata_size = read_32bitBE(data_offset+4, infile);
                                bytes_read = 8;
                                if (qthis)
                                {
                                    result.value.value_data.offset = vardata_offset;
                                    result.value.value_data.size = vardata_size;
                                }
                            }
                            break;

                        case COLUMN_TYPE_8BYTE:
                            {
                                uint64_t value =
                                    read_32bitBE(data_offset, infile);
                                value <<= 32;
                                value |=
                                    read_32bitBE(data_offset+4, infile);
                                if (qthis)
                                {
                                    result.value.value_u64 = value;
                                }
                                bytes_read = 8;
                                break;
                            }
                        case COLUMN_TYPE_4BYTE:
                            {
                                uint32_t value =
                                    read_32bitBE(data_offset, infile);
                                if (qthis)
                                {
                                    result.value.value_u32 = value;
                                }
                                bytes_read = 4;
                            }
                            break;
                        case COLUMN_TYPE_2BYTE2:
                        case COLUMN_TYPE_2BYTE:
                            {
                                uint16_t value = 
                                    read_16bitBE(data_offset, infile);
                                if (qthis)
                                {
                                    result.value.value_u16 = value;
                                }
                                bytes_read = 2;
                            }
                            break;
                        case COLUMN_TYPE_FLOAT:
                            if (sizeof(float) == 4)
                            {
                                union {
                                    float float_value;
                                    uint32_t int_value;
                                } int_float;

                                int_float.int_value = read_32bitBE(data_offset, infile);
                                if (qthis)
                                {
                                    result.value.value_float = int_float.float_value;
                                }
                            }
                            else
                            {
                                read_32bitBE(data_offset, infile);
                                if (qthis)
                                {
                                    goto cleanup_error;
                                }
                            }
                            bytes_read = 4;
                            break;
                        case COLUMN_TYPE_1BYTE2:
                        case COLUMN_TYPE_1BYTE:
                            {
                                uint8_t value =
                                    read_8bit(data_offset, infile);
                                if (qthis)
                                {
                                    result.value.value_u8 = value;
                                }
                                bytes_read = 1;
                            }
                            break;
                        default:
                            goto cleanup_error;
                    }

                    if (!constant)
                    {
                        row_offset += bytes_read;
                    }
                } /* useless if end */
            } /* column for loop end */

            if (row_offset - row_start_offset != table_info.row_width)
                goto cleanup_error;

            if (query && i >= query->index) break;
        } /* row for loop end */
    } /* explore values block end */

//cleanup:

    result.valid = 1;
cleanup_error:

    if (string_table)
    {
        free(string_table);
        string_table = NULL;
    }

    if (schema)
    {
        free(schema);
        schema = NULL;
    }

    return result;
}

static struct utf_query_result query_utf(STREAMFILE *infile, const long offset, const struct utf_query *query)
{
    return analyze_utf(infile, offset, query);
}

static struct utf_query_result query_utf_nofail(STREAMFILE *infile, const long offset, const struct utf_query *query, int *error)
{
    const struct utf_query_result result = query_utf(infile, offset, query);

    if (error)
    {
        *error = 0;
        if (!result.valid) *error = 1;
        if (query && !result.found) *error = 1;
    }

    return result;
}

static struct utf_query_result query_utf_key(STREAMFILE *infile, const long offset, int index, const char *name, int *error)
{
    struct utf_query query;
    query.index = index;
    query.name = name;

    return query_utf_nofail(infile, offset, &query, error);
}

static uint8_t query_utf_1byte(STREAMFILE *infile, const long offset, int index, const char *name, int *error)
{
    struct utf_query_result result = query_utf_key(infile, offset, index, name, error);
    if (error)
    {
        if (result.type != COLUMN_TYPE_1BYTE) *error = 1;
    }
    return result.value.value_u8;
}

static uint32_t query_utf_4byte(STREAMFILE *infile, const long offset, int index, const char *name, int *error)
{
    struct utf_query_result result = query_utf_key(infile, offset, index, name, error);
    if (error)
    {
        if (result.type != COLUMN_TYPE_4BYTE) *error = 1;
    }
    return result.value.value_u32;
}

static struct offset_size_pair query_utf_data(STREAMFILE *infile, const long offset,
        int index, const char *name, int *error)
{
    struct utf_query_result result = query_utf_key(infile, offset, index, name, error);
    if (error)
    {
        if (result.type != COLUMN_TYPE_DATA) *error = 1;
    }
    return result.value.value_data;
}

/* CRI's UTF wrapper around DSP */
VGMSTREAM * init_vgmstream_utf_dsp(STREAMFILE *streamFile) {
    
	VGMSTREAM * vgmstream = NULL;
    char filename[PATH_LIMIT];
    int table_error = 0;

    int loop_flag = 0;

    const long top_offset = 0;

    int channel_count;
    int sample_rate;
    long sample_count;

    long top_data_offset, segment_count;
    long body_offset, body_size;
    long header_offset, header_size;

    /* check extension, case insensitive */
    streamFile->get_name(streamFile,filename,sizeof(filename));
    //if (strcasecmp("aax",filename_extension(filename))) goto fail;

    /* get entry count, data offset */
    {
        struct utf_query_result result;
        long top_string_table_offset;
        long top_string_table_size;
        long name_offset;
       
        result = query_utf_nofail(streamFile, top_offset, NULL, &table_error);
        if (table_error) goto fail;
        segment_count = result.rows;
        if (segment_count != 1) goto fail; // only simple stuff for now
        top_string_table_offset = top_offset + 8 + result.string_table_offset;
        top_data_offset = top_offset + 8 + result.data_offset;
        top_string_table_size = top_data_offset - top_string_table_offset;

        if (result.name_offset+10 > top_string_table_size) goto fail;

        name_offset = top_string_table_offset + result.name_offset;
        if (read_32bitBE(name_offset, streamFile) != 0x41445043   ||// "ADPC"
            read_32bitBE(name_offset+4, streamFile) != 0x4D5F5749 ||// "M_WI"
            read_16bitBE(name_offset+8, streamFile) != 0x4900)      // "I\0"
            goto fail;
    }

    {
        struct offset_size_pair offset_size;

        offset_size = query_utf_data(streamFile, top_offset, 0, "data", &table_error);
        if (table_error) goto fail;
        body_offset = top_data_offset + offset_size.offset;
        body_size = offset_size.size;

        offset_size = query_utf_data(streamFile, top_offset, 0, "header", &table_error);
        if (table_error) goto fail;
        header_offset = top_data_offset + offset_size.offset;
        header_size = offset_size.size;
    }

    channel_count = query_utf_1byte(streamFile, top_offset, 0, "nch", &table_error);
    sample_count = query_utf_4byte(streamFile, top_offset, 0, "nsmpl", &table_error);
    sample_rate = query_utf_4byte(streamFile, top_offset, 0, "sfreq", &table_error);
    if (table_error) goto fail;
    if (channel_count != 1 && channel_count != 2) goto fail;
    if (header_size != channel_count * 0x60) goto fail;

    vgmstream = allocate_vgmstream(channel_count,loop_flag);

    vgmstream->num_samples = sample_count;
    vgmstream->sample_rate = sample_rate;

    vgmstream->coding_type = coding_NGC_DSP;
    vgmstream->layout_type = layout_none;
    vgmstream->meta_type = meta_UTF_DSP;

    {
        int i,j;
        long channel_size = (body_size+7)/8*8/channel_count;
        for (i = 0; i < channel_count; i++)
        {
            vgmstream->ch[i].streamfile = streamFile->open(streamFile,filename,STREAMFILE_DEFAULT_BUFFER_SIZE);
            if (!vgmstream->ch[i].streamfile) goto fail;
            vgmstream->ch[i].channel_start_offset =
                vgmstream->ch[i].offset = body_offset + i * channel_size;
            for (j=0;j<16;j++)
            {
                vgmstream->ch[i].adpcm_coef[j] =
                    read_16bitBE(header_offset + 0x60*i + 0x1c + j*2, streamFile);
            }
        }
    }

    return vgmstream;

    /* clean up anything we may have opened */
fail:
    if (vgmstream) close_vgmstream(vgmstream);
    return NULL;
}