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snd_ogg.c

/*
      Copyright (C) 2003-2005  Mathieu Olivier

      This program is free software; you can redistribute it and/or
      modify it under the terms of the GNU General Public License
      as published by the Free Software Foundation; either version 2
      of the License, or (at your option) any later version.

      This program is distributed in the hope that it will be useful,
      but WITHOUT ANY WARRANTY; without even the implied warranty of
      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

      See the GNU General Public License for more details.

      You should have received a copy of the GNU General Public License
      along with this program; if not, write to:

            Free Software Foundation, Inc.
            59 Temple Place - Suite 330
            Boston, MA  02111-1307, USA

*/


#include "quakedef.h"
#include "snd_main.h"
#include "snd_ogg.h"
#include "snd_wav.h"

#ifdef LINK_TO_LIBVORBIS
#define OV_EXCLUDE_STATIC_CALLBACKS
#include <ogg/ogg.h>
#include <vorbis/vorbisfile.h>

#define qov_clear ov_clear
#define qov_info ov_info
#define qov_comment ov_comment
#define qov_open_callbacks ov_open_callbacks
#define qov_pcm_seek ov_pcm_seek
#define qov_pcm_total ov_pcm_total
#define qov_read ov_read
#define qvorbis_comment_query vorbis_comment_query

qboolean OGG_OpenLibrary (void) {return true;}
void OGG_CloseLibrary (void) {}
#else

/*
=================================================================

  Minimal set of definitions from the Ogg Vorbis lib
  (C) COPYRIGHT 1994-2001 by the XIPHOPHORUS Company
  http://www.xiph.org/

  WARNING: for a matter of simplicity, several pointer types are
  casted to "void*", and most enumerated values are not included

=================================================================
*/

#ifdef _MSC_VER
typedef __int64 ogg_int64_t;
#else
typedef long long ogg_int64_t;
#endif

00067 typedef struct
{
      size_t      (*read_func)      (void *ptr, size_t size, size_t nmemb, void *datasource);
      int         (*seek_func)      (void *datasource, ogg_int64_t offset, int whence);
      int         (*close_func)     (void *datasource);
      long  (*tell_func)      (void *datasource);
} ov_callbacks;

typedef struct
{
      unsigned char     *data;
      int                     storage;
      int                     fill;
      int                     returned;
      int                     unsynced;
      int                     headerbytes;
      int                     bodybytes;
} ogg_sync_state;

typedef struct
{
      int         version;
      int         channels;
      long  rate;
      long  bitrate_upper;
      long  bitrate_nominal;
      long  bitrate_lower;
      long  bitrate_window;
      void  *codec_setup;
} vorbis_info;

typedef struct
{
      unsigned char     *body_data;
      long              body_storage;
      long              body_fill;
      long              body_returned;
      int                     *lacing_vals;
      ogg_int64_t       *granule_vals;
      long              lacing_storage;
      long              lacing_fill;
      long              lacing_packet;
      long              lacing_returned;
      unsigned char     header[282];
      int                     header_fill;
      int                     e_o_s;
      int                     b_o_s;
      long              serialno;
      long              pageno;
      ogg_int64_t       packetno;
      ogg_int64_t       granulepos;
} ogg_stream_state;

typedef struct
{
      int               analysisp;
      vorbis_info *vi;
      float       **pcm;
      float       **pcmret;
      int               pcm_storage;
      int               pcm_current;
      int               pcm_returned;
      int               preextrapolate;
      int               eofflag;
      long        lW;
      long        W;
      long        nW;
      long        centerW;
      ogg_int64_t granulepos;
      ogg_int64_t sequence;
      ogg_int64_t glue_bits;
      ogg_int64_t time_bits;
      ogg_int64_t floor_bits;
      ogg_int64_t res_bits;
      void        *backend_state;
} vorbis_dsp_state;

typedef struct
{
      long              endbyte;
      int                     endbit;
      unsigned char     *buffer;
      unsigned char     *ptr;
      long              storage;
} oggpack_buffer;

typedef struct
{
      float                   **pcm;
      oggpack_buffer          opb;
      long                    lW;
      long                    W;
      long                    nW;
      int                           pcmend;
      int                           mode;
      int                           eofflag;
      ogg_int64_t             granulepos;
      ogg_int64_t             sequence;
      vorbis_dsp_state  *vd;
      void                    *localstore;
      long                    localtop;
      long                    localalloc;
      long                    totaluse;
      void                    *reap;  // VOIDED POINTER
      long                    glue_bits;
      long                    time_bits;
      long                    floor_bits;
      long                    res_bits;
      void                    *internal;
} vorbis_block;

typedef struct
{
      char **user_comments;
      int   *comment_lengths;
      int    comments;
      char  *vendor;
} vorbis_comment;

00186 typedef struct
{
      void                    *datasource;
      int                           seekable;
      ogg_int64_t             offset;
      ogg_int64_t             end;
      ogg_sync_state          oy;
      int                           links;
      ogg_int64_t             *offsets;
      ogg_int64_t             *dataoffsets;
      long                    *serialnos;
      ogg_int64_t             *pcmlengths;
      vorbis_info             *vi;
      vorbis_comment          *vc;
      ogg_int64_t             pcm_offset;
      int                           ready_state;
      long                    current_serialno;
      int                           current_link;
      double                        bittrack;
      double                        samptrack;
      ogg_stream_state  os;
      vorbis_dsp_state  vd;
      vorbis_block            vb;
      ov_callbacks            callbacks;
} OggVorbis_File;


/*
=================================================================

  DarkPlaces definitions

=================================================================
*/

// Functions exported from the vorbisfile library
static int (*qov_clear) (OggVorbis_File *vf);
static vorbis_info* (*qov_info) (OggVorbis_File *vf,int link);
static vorbis_comment* (*qov_comment) (OggVorbis_File *vf,int link);
static char * (*qvorbis_comment_query) (vorbis_comment *vc, const char *tag, int count);
static int (*qov_open_callbacks) (void *datasource, OggVorbis_File *vf,
                                                  char *initial, long ibytes,
                                                  ov_callbacks callbacks);
static int (*qov_pcm_seek) (OggVorbis_File *vf,ogg_int64_t pos);
static ogg_int64_t (*qov_pcm_total) (OggVorbis_File *vf,int i);
static long (*qov_read) (OggVorbis_File *vf,char *buffer,int length,
                                     int bigendianp,int word,int sgned,int *bitstream);

static dllfunction_t vorbisfilefuncs[] =
{
      {"ov_clear",                        (void **) &qov_clear},
      {"ov_info",                         (void **) &qov_info},
      {"ov_comment",                      (void **) &qov_comment},
      {"ov_open_callbacks",         (void **) &qov_open_callbacks},
      {"ov_pcm_seek",                     (void **) &qov_pcm_seek},
      {"ov_pcm_total",              (void **) &qov_pcm_total},
      {"ov_read",                         (void **) &qov_read},
      {NULL, NULL}
};

static dllfunction_t vorbisfuncs[] =
{
      {"vorbis_comment_query",      (void **) &qvorbis_comment_query},
      {NULL, NULL}
};

// Handles for the Vorbis and Vorbisfile DLLs
static dllhandle_t vo_dll = NULL;
static dllhandle_t vf_dll = NULL;


/*
=================================================================

  DLL load & unload

=================================================================
*/

/*
====================
OGG_OpenLibrary

Try to load the VorbisFile DLL
====================
*/
qboolean OGG_OpenLibrary (void)
{
      const char* dllnames_vo [] =
      {
#if defined(WIN32)
            "libvorbis-0.dll",
            "libvorbis.dll",
            "vorbis.dll",
#elif defined(MACOSX)
            "libvorbis.dylib",
#else
            "libvorbis.so.0",
            "libvorbis.so",
#endif
            NULL
      };
      const char* dllnames_vf [] =
      {
#if defined(WIN32)
            "libvorbisfile-3.dll",
            "libvorbisfile.dll",
            "vorbisfile.dll",
#elif defined(MACOSX)
            "libvorbisfile.dylib",
#else
            "libvorbisfile.so.3",
            "libvorbisfile.so",
#endif
            NULL
      };

      // Already loaded?
      if (vf_dll)
            return true;

// COMMANDLINEOPTION: Sound: -novorbis disables ogg vorbis sound support
      if (COM_CheckParm("-novorbis"))
            return false;

      // Load the DLLs
      // We need to load both by hand because some OSes seem to not load
      // the vorbis DLL automatically when loading the VorbisFile DLL
      return Sys_LoadLibrary (dllnames_vo, &vo_dll, vorbisfuncs) && Sys_LoadLibrary (dllnames_vf, &vf_dll, vorbisfilefuncs);
}


/*
====================
OGG_CloseLibrary

Unload the VorbisFile DLL
====================
*/
void OGG_CloseLibrary (void)
{
      Sys_UnloadLibrary (&vf_dll);
      Sys_UnloadLibrary (&vo_dll);
}

#endif

/*
=================================================================

      Ogg Vorbis decoding

=================================================================
*/

00341 typedef struct
{
      unsigned char *buffer;
      ogg_int64_t ind, buffsize;
} ov_decode_t;

static size_t ovcb_read (void *ptr, size_t size, size_t nb, void *datasource)
{
      ov_decode_t *ov_decode = (ov_decode_t*)datasource;
      size_t remain, len;

      remain = ov_decode->buffsize - ov_decode->ind;
      len = size * nb;
      if (remain < len)
            len = remain - remain % size;

      memcpy (ptr, ov_decode->buffer + ov_decode->ind, len);
      ov_decode->ind += len;

      return len / size;
}

static int ovcb_seek (void *datasource, ogg_int64_t offset, int whence)
{
      ov_decode_t *ov_decode = (ov_decode_t*)datasource;

      switch (whence)
      {
            case SEEK_SET:
                  break;
            case SEEK_CUR:
                  offset += ov_decode->ind;
                  break;
            case SEEK_END:
                  offset += ov_decode->buffsize;
                  break;
            default:
                  return -1;
      }
      if (offset < 0 || offset > ov_decode->buffsize)
            return -1;

      ov_decode->ind = offset;
      return 0;
}

static int ovcb_close (void *ov_decode)
{
      return 0;
}

static long ovcb_tell (void *ov_decode)
{
      return ((ov_decode_t*)ov_decode)->ind;
}

// Per-sfx data structure
00398 typedef struct
{
      unsigned char     *file;
      size_t                  filesize;
      snd_format_t      format;
      unsigned int      total_length;
      char              name[128];
} ogg_stream_persfx_t;

// Per-channel data structure
00408 typedef struct
{
      OggVorbis_File    vf;
      ov_decode_t       ov_decode;
      unsigned int      sb_offset;
      int                     bs;
      snd_buffer_t      sb;         // must be at the end due to its dynamically allocated size
} ogg_stream_perchannel_t;


static const ov_callbacks callbacks = {ovcb_read, ovcb_seek, ovcb_close, ovcb_tell};

/*
====================
OGG_FetchSound
====================
*/
static const snd_buffer_t* OGG_FetchSound (void *sfxfetcher, void **chfetcherpointer, unsigned int *start, unsigned int nbsampleframes)
{
      ogg_stream_perchannel_t* per_ch = (ogg_stream_perchannel_t *)*chfetcherpointer;
      ogg_stream_persfx_t* per_sfx = (ogg_stream_persfx_t *)sfxfetcher;
      snd_buffer_t* sb;
      int newlength, done, ret;
      unsigned int real_start;
      unsigned int factor;

      // If there's no fetcher structure attached to the channel yet
      if (per_ch == NULL)
      {
            size_t buff_len, memsize;
            snd_format_t sb_format;

            sb_format.speed = snd_renderbuffer->format.speed;
            sb_format.width = per_sfx->format.width;
            sb_format.channels = per_sfx->format.channels;

            buff_len = STREAM_BUFFER_SIZE(&sb_format);
            memsize = sizeof (*per_ch) - sizeof (per_ch->sb.samples) + buff_len;
            per_ch = (ogg_stream_perchannel_t *)Mem_Alloc (snd_mempool, memsize);

            // Open it with the VorbisFile API
            per_ch->ov_decode.buffer = per_sfx->file;
            per_ch->ov_decode.ind = 0;
            per_ch->ov_decode.buffsize = per_sfx->filesize;
            if (qov_open_callbacks (&per_ch->ov_decode, &per_ch->vf, NULL, 0, callbacks) < 0)
            {
                  Con_Printf("error while reading Ogg Vorbis stream \"%s\"\n", per_sfx->name);
                  Mem_Free (per_ch);
                  return NULL;
            }
            per_ch->bs = 0;

            per_ch->sb_offset = 0;
            per_ch->sb.format = sb_format;
            per_ch->sb.nbframes = 0;
            per_ch->sb.maxframes = buff_len / (per_ch->sb.format.channels * per_ch->sb.format.width);

            *chfetcherpointer = per_ch;
      }

      real_start = *start;

      sb = &per_ch->sb;
      factor = per_sfx->format.width * per_sfx->format.channels;

      // If the stream buffer can't contain that much samples anyway
      if (nbsampleframes > sb->maxframes)
      {
            Con_Printf ("OGG_FetchSound: stream buffer too small (%u sample frames required)\n", nbsampleframes);
            return NULL;
      }

      // If the data we need has already been decompressed in the sfxbuffer, just return it
      if (per_ch->sb_offset <= real_start && per_ch->sb_offset + sb->nbframes >= real_start + nbsampleframes)
      {
            *start = per_ch->sb_offset;
            return sb;
      }

      newlength = (int)(per_ch->sb_offset + sb->nbframes) - real_start;

      // If we need to skip some data before decompressing the rest, or if the stream has looped
      if (newlength < 0 || per_ch->sb_offset > real_start)
      {
            unsigned int time_start;
            ogg_int64_t ogg_start;
            int err;

            if (real_start > (unsigned int)per_sfx->total_length)
            {
                  Con_Printf ("OGG_FetchSound: asked for a start position after the end of the sfx! (%u > %u)\n",
                                    real_start, per_sfx->total_length);
                  return NULL;
            }

            // We work with 200ms (1/5 sec) steps to avoid rounding errors
            time_start = real_start * 5 / snd_renderbuffer->format.speed;
            ogg_start = time_start * (per_sfx->format.speed / 5);
            err = qov_pcm_seek (&per_ch->vf, ogg_start);
            if (err != 0)
            {
                  Con_Printf ("OGG_FetchSound: qov_pcm_seek(..., %d) returned %d\n",
                                    real_start, err);
                  return NULL;
            }
            sb->nbframes = 0;

            real_start = (unsigned int) ((float)ogg_start / per_sfx->format.speed * snd_renderbuffer->format.speed);
            if (*start - real_start + nbsampleframes > sb->maxframes)
            {
                  Con_Printf ("OGG_FetchSound: stream buffer too small after seek (%u sample frames required)\n",
                                    *start - real_start + nbsampleframes);
                  per_ch->sb_offset = real_start;
                  return NULL;
            }
      }
      // Else, move forward the samples we need to keep in the sound buffer
      else
      {
            memmove (sb->samples, sb->samples + (real_start - per_ch->sb_offset) * factor, newlength * factor);
            sb->nbframes = newlength;
      }

      per_ch->sb_offset = real_start;

      // We add more than one frame of sound to the buffer:
      // 1- to ensure we won't lose many samples during the resampling process
      // 2- to reduce calls to OGG_FetchSound to regulate workload
      newlength = (int)(per_sfx->format.speed*STREAM_BUFFER_FILL);
      // this is how much we FETCH...
      if ((size_t) ((double) newlength * (double)sb->format.speed / (double)per_sfx->format.speed) + sb->nbframes > sb->maxframes)
      {
            Con_Printf ("OGG_FetchSound: stream buffer overflow (%u + %u = %u sample frames / %u)\n",
                              (unsigned int) ((double) newlength * (double)sb->format.speed / (double)per_sfx->format.speed), sb->nbframes, (unsigned int) ((double) newlength * (double)sb->format.speed / (double)per_sfx->format.speed) + sb->nbframes, sb->maxframes);
            return NULL;
      }
      newlength *= factor; // convert from sample frames to bytes
      if(newlength > (int)sizeof(resampling_buffer))
            newlength = sizeof(resampling_buffer);

      // Decompress in the resampling_buffer
      done = 0;
      while ((ret = qov_read (&per_ch->vf, (char *)&resampling_buffer[done], (int)(newlength - done), mem_bigendian, 2, 1, &per_ch->bs)) > 0)
            done += ret;

      Snd_AppendToSndBuffer (sb, resampling_buffer, (size_t)done / (size_t)factor, &per_sfx->format);

      *start = per_ch->sb_offset;
      return sb;
}


/*
====================
OGG_FetchEnd
====================
*/
static void OGG_FetchEnd (void *chfetcherdata)
{
      ogg_stream_perchannel_t* per_ch = (ogg_stream_perchannel_t *)chfetcherdata;

      if (per_ch != NULL)
      {
            // Free the ogg vorbis decoder
            qov_clear (&per_ch->vf);

            Mem_Free (per_ch);
      }
}


/*
====================
OGG_FreeSfx
====================
*/
static void OGG_FreeSfx (void *sfxfetcherdata)
{
      ogg_stream_persfx_t* per_sfx = (ogg_stream_persfx_t *)sfxfetcherdata;

      // Free the Ogg Vorbis file
      Mem_Free(per_sfx->file);

      // Free the stream structure
      Mem_Free(per_sfx);
}


/*
====================
OGG_GetFormat
====================
*/
static const snd_format_t* OGG_GetFormat (sfx_t* sfx)
{
      ogg_stream_persfx_t* per_sfx = (ogg_stream_persfx_t *)sfx->fetcher_data;
      return &per_sfx->format;
}

static const snd_fetcher_t ogg_fetcher = { OGG_FetchSound, OGG_FetchEnd, OGG_FreeSfx, OGG_GetFormat };

static void OGG_DecodeTags(vorbis_comment *vc, unsigned int *start, unsigned int *length, double samplesfactor, unsigned int numsamples, double *peak, double *gaindb)
{
      const char *startcomment = NULL, *lengthcomment = NULL, *endcomment = NULL, *thiscomment = NULL;

      *start = numsamples;
      *length = numsamples;
      *peak = 0.0;
      *gaindb = 0.0;

      if(!vc)
            return;

      thiscomment = qvorbis_comment_query(vc, "REPLAYGAIN_TRACK_PEAK", 0);
      if(thiscomment)
            *peak = atof(thiscomment);
      thiscomment = qvorbis_comment_query(vc, "REPLAYGAIN_TRACK_GAIN", 0);
      if(thiscomment)
            *gaindb = atof(thiscomment);
      
      startcomment = qvorbis_comment_query(vc, "LOOP_START", 0); // DarkPlaces, and some Japanese app
      if(startcomment)
      {
            endcomment = qvorbis_comment_query(vc, "LOOP_END", 0);
            if(!endcomment)
                  lengthcomment = qvorbis_comment_query(vc, "LOOP_LENGTH", 0);
      }
      else
      {
            startcomment = qvorbis_comment_query(vc, "LOOPSTART", 0); // RPG Maker VX
            if(startcomment)
            {
                  lengthcomment = qvorbis_comment_query(vc, "LOOPLENGTH", 0);
                  if(!lengthcomment)
                        endcomment = qvorbis_comment_query(vc, "LOOPEND", 0);
            }
            else
            {
                  startcomment = qvorbis_comment_query(vc, "LOOPPOINT", 0); // Sonic Robo Blast 2
            }
      }

      if(startcomment)
      {
            *start = (unsigned int) bound(0, atof(startcomment) * samplesfactor, numsamples);
            if(endcomment)
                  *length = (unsigned int) bound(0, atof(endcomment) * samplesfactor, numsamples);
            else if(lengthcomment)
                  *length = (unsigned int) bound(0, *start + atof(lengthcomment) * samplesfactor, numsamples);
      }
}

/*
====================
OGG_LoadVorbisFile

Load an Ogg Vorbis file into memory
====================
*/
qboolean OGG_LoadVorbisFile (const char *filename, sfx_t *sfx)
{
      unsigned char *data;
      fs_offset_t filesize;
      ov_decode_t ov_decode;
      OggVorbis_File vf;
      vorbis_info *vi;
      vorbis_comment *vc;
      ogg_int64_t len, buff_len;
      double peak, gaindb;

#ifndef LINK_TO_LIBVORBIS
      if (!vf_dll)
            return false;
#endif

      // Already loaded?
      if (sfx->fetcher != NULL)
            return true;

      // Load the file
      data = FS_LoadFile (filename, snd_mempool, false, &filesize);
      if (data == NULL)
            return false;

      if (developer_loading.integer >= 2)
            Con_Printf ("Loading Ogg Vorbis file \"%s\"\n", filename);

      // Open it with the VorbisFile API
      ov_decode.buffer = data;
      ov_decode.ind = 0;
      ov_decode.buffsize = filesize;
      if (qov_open_callbacks (&ov_decode, &vf, NULL, 0, callbacks) < 0)
      {
            Con_Printf ("error while opening Ogg Vorbis file \"%s\"\n", filename);
            Mem_Free(data);
            return false;
      }

      // Get the stream information
      vi = qov_info (&vf, -1);
      if (vi->channels < 1 || vi->channels > 2)
      {
            Con_Printf("%s has an unsupported number of channels (%i)\n",
                              sfx->name, vi->channels);
            qov_clear (&vf);
            Mem_Free(data);
            return false;
      }

      len = qov_pcm_total (&vf, -1) * vi->channels * 2;  // 16 bits => "* 2"

      // Decide if we go for a stream or a simple PCM cache
      buff_len = (int)ceil (STREAM_BUFFER_DURATION * snd_renderbuffer->format.speed) * 2 * vi->channels;
      if (snd_streaming.integer && (len > (ogg_int64_t)filesize + 3 * buff_len || snd_streaming.integer >= 2))
      {
            ogg_stream_persfx_t* per_sfx;

            if (developer_loading.integer >= 2)
                  Con_Printf ("Ogg sound file \"%s\" will be streamed\n", filename);
            per_sfx = (ogg_stream_persfx_t *)Mem_Alloc (snd_mempool, sizeof (*per_sfx));
            strlcpy(per_sfx->name, sfx->name, sizeof(per_sfx->name));
            sfx->memsize += sizeof (*per_sfx);
            per_sfx->file = data;
            per_sfx->filesize = filesize;
            sfx->memsize += filesize;

            per_sfx->format.speed = vi->rate;
            per_sfx->format.width = 2;  // We always work with 16 bits samples
            per_sfx->format.channels = vi->channels;

            sfx->fetcher_data = per_sfx;
            sfx->fetcher = &ogg_fetcher;
            sfx->flags |= SFXFLAG_STREAMED;
            sfx->total_length = (int)((size_t)len / (per_sfx->format.channels * 2) * ((double)snd_renderbuffer->format.speed / per_sfx->format.speed));
            vc = qov_comment(&vf, -1);
            OGG_DecodeTags(vc, &sfx->loopstart, &sfx->total_length, (double)snd_renderbuffer->format.speed / (double)per_sfx->format.speed, sfx->total_length, &peak, &gaindb);
            per_sfx->total_length = sfx->total_length;
            qov_clear (&vf);
      }
      else
      {
            char *buff;
            ogg_int64_t done;
            int bs;
            long ret;
            snd_buffer_t *sb;
            snd_format_t ogg_format;

            if (developer_loading.integer >= 2)
                  Con_Printf ("Ogg sound file \"%s\" will be cached\n", filename);

            // Decode it
            buff = (char *)Mem_Alloc (snd_mempool, (int)len);
            done = 0;
            bs = 0;
            while ((ret = qov_read (&vf, &buff[done], (int)(len - done), mem_bigendian, 2, 1, &bs)) > 0)
                  done += ret;

            // Build the sound buffer
            ogg_format.speed = vi->rate;
            ogg_format.channels = vi->channels;
            ogg_format.width = 2;  // We always work with 16 bits samples
            sb = Snd_CreateSndBuffer ((unsigned char *)buff, (size_t)done / (vi->channels * 2), &ogg_format, snd_renderbuffer->format.speed);
            if (sb == NULL)
            {
                  qov_clear (&vf);
                  Mem_Free (data);
                  Mem_Free (buff);
                  return false;
            }

            sfx->fetcher = &wav_fetcher;
            sfx->fetcher_data = sb;

            sfx->total_length = sb->nbframes;
            sfx->memsize += sb->maxframes * sb->format.channels * sb->format.width + sizeof (*sb) - sizeof (sb->samples);

            sfx->flags &= ~SFXFLAG_STREAMED;
            vc = qov_comment(&vf, -1);
            OGG_DecodeTags(vc, &sfx->loopstart, &sfx->total_length, (double)snd_renderbuffer->format.speed / (double)sb->format.speed, sfx->total_length, &peak, &gaindb);
            sb->nbframes = sfx->total_length;
            qov_clear (&vf);
            Mem_Free (data);
            Mem_Free (buff);
      }

      if(peak)
      {
            sfx->volume_mult = min(1.0f / peak, exp(gaindb * 0.05f * log(10.0f)));
            sfx->volume_peak = peak;
            if (developer_loading.integer >= 2)
                  Con_Printf ("Ogg sound file \"%s\" uses ReplayGain (gain %f, peak %f)\n", filename, sfx->volume_mult, sfx->volume_peak);
      }

      return true;
}

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