src/audio/SDL_wave.h
author Sam Lantinga
Sun, 22 Jun 2014 10:05:59 -0700
changeset 8909 a894224dc538
parent 8149 681eb46b8ac4
child 8998 995f6cd966a7
permissions -rw-r--r--
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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/*
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  Simple DirectMedia Layer
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  Copyright (C) 1997-2014 Sam Lantinga <slouken@libsdl.org>
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  This software is provided 'as-is', without any express or implied
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  warranty.  In no event will the authors be held liable for any damages
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  arising from the use of this software.
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  Permission is granted to anyone to use this software for any purpose,
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  including commercial applications, and to alter it and redistribute it
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  freely, subject to the following restrictions:
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  1. The origin of this software must not be misrepresented; you must not
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     claim that you wrote the original software. If you use this software
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     in a product, an acknowledgment in the product documentation would be
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     appreciated but is not required.
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  2. Altered source versions must be plainly marked as such, and must not be
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     misrepresented as being the original software.
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  3. This notice may not be removed or altered from any source distribution.
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*/
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#include "../SDL_internal.h"
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/* WAVE files are little-endian */
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/*******************************************/
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/* Define values for Microsoft WAVE format */
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/*******************************************/
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#define RIFF            0x46464952      /* "RIFF" */
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#define WAVE            0x45564157      /* "WAVE" */
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#define FACT            0x74636166      /* "fact" */
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#define LIST            0x5453494c      /* "LIST" */
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#define BEXT            0x74786562      /* "bext" */
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#define FMT             0x20746D66      /* "fmt " */
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#define DATA            0x61746164      /* "data" */
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#define PCM_CODE        0x0001
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#define MS_ADPCM_CODE   0x0002
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#define IEEE_FLOAT_CODE 0x0003
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#define IMA_ADPCM_CODE  0x0011
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#define MP3_CODE        0x0055
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#define WAVE_MONO       1
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#define WAVE_STEREO     2
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/* Normally, these three chunks come consecutively in a WAVE file */
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typedef struct WaveFMT
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{
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/* Not saved in the chunk we read:
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    Uint32  FMTchunk;
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    Uint32  fmtlen;
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*/
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    Uint16 encoding;
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    Uint16 channels;            /* 1 = mono, 2 = stereo */
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    Uint32 frequency;           /* One of 11025, 22050, or 44100 Hz */
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    Uint32 byterate;            /* Average bytes per second */
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    Uint16 blockalign;          /* Bytes per sample block */
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    Uint16 bitspersample;       /* One of 8, 12, 16, or 4 for ADPCM */
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} WaveFMT;
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/* The general chunk found in the WAVE file */
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typedef struct Chunk
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{
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    Uint32 magic;
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    Uint32 length;
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    Uint8 *data;
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} Chunk;
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/* vi: set ts=4 sw=4 expandtab: */