kc3-lang/SDL/src/audio/SDL_wave.h

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• Hash : 9f5e3ed7
  Author :
  Date : 2014-06-22T10:05:59
  

  Fixed bug 1673 - BEXT wave files only have extra metadata that you can easily skip through
  
  bill
  
  In SDL_wave.c, BEXT wave files with "bext" instead of "fmt " are choked on
  
      if (chunk.magic != FMT) {
          SDL_SetError("Complex WAVE files not supported");
          was_error = 1;
          goto done;
      }
  
  BEXT files http://en.wikipedia.org/wiki/Broadcast_Wave_Format actually playback the same as regular waves.  All they have is (A LOT OF) extra header info.
  
  To open them, just SKIP the "bext" chunk, and the "fmt " chunk will be a couple of hundred bytes later.
  
  The "fmt " chunk is also bloated, but if you skip past the extra information to the "data" chunk, there is nothing different about a BEXT wave file than a "normal" one.
  
  You can then load the data and proceed as normal.
  

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• src/audio/SDL_wave.h

• /*
    Simple DirectMedia Layer
    Copyright (C) 1997-2014 Sam Lantinga <slouken@libsdl.org>
  
    This software is provided 'as-is', without any express or implied
    warranty.  In no event will the authors be held liable for any damages
    arising from the use of this software.
  
    Permission is granted to anyone to use this software for any purpose,
    including commercial applications, and to alter it and redistribute it
    freely, subject to the following restrictions:
  
    1. The origin of this software must not be misrepresented; you must not
       claim that you wrote the original software. If you use this software
       in a product, an acknowledgment in the product documentation would be
       appreciated but is not required.
    2. Altered source versions must be plainly marked as such, and must not be
       misrepresented as being the original software.
    3. This notice may not be removed or altered from any source distribution.
  */
  #include "../SDL_internal.h"
  
  /* WAVE files are little-endian */
  
  /*******************************************/
  /* Define values for Microsoft WAVE format */
  /*******************************************/
  #define RIFF            0x46464952      /* "RIFF" */
  #define WAVE            0x45564157      /* "WAVE" */
  #define FACT            0x74636166      /* "fact" */
  #define LIST            0x5453494c      /* "LIST" */
  #define BEXT            0x74786562      /* "bext" */
  #define FMT             0x20746D66      /* "fmt " */
  #define DATA            0x61746164      /* "data" */
  #define PCM_CODE        0x0001
  #define MS_ADPCM_CODE   0x0002
  #define IEEE_FLOAT_CODE 0x0003
  #define IMA_ADPCM_CODE  0x0011
  #define MP3_CODE        0x0055
  #define WAVE_MONO       1
  #define WAVE_STEREO     2
  
  /* Normally, these three chunks come consecutively in a WAVE file */
  typedef struct WaveFMT
  {
  /* Not saved in the chunk we read:
      Uint32  FMTchunk;
      Uint32  fmtlen;
  */
      Uint16 encoding;
      Uint16 channels;            /* 1 = mono, 2 = stereo */
      Uint32 frequency;           /* One of 11025, 22050, or 44100 Hz */
      Uint32 byterate;            /* Average bytes per second */
      Uint16 blockalign;          /* Bytes per sample block */
      Uint16 bitspersample;       /* One of 8, 12, 16, or 4 for ADPCM */
  } WaveFMT;
  
  /* The general chunk found in the WAVE file */
  typedef struct Chunk
  {
      Uint32 magic;
      Uint32 length;
      Uint8 *data;
  } Chunk;
  
  /* vi: set ts=4 sw=4 expandtab: */
  

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