/*

SDL_mixer: An audio mixer library based on the SDL library

Copyright (C) 1997-2016 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.

This is the source needed to decode an MP3 into a waveform.

*/

/* $Id$ */

#if defined(MP3_MUSIC) || defined(MP3_MAD_MUSIC)

#include "SDL_mixer.h"

#include "load_mp3.h"

#if defined(MP3_MUSIC)

#include "dynamic_mp3.h"

#elif defined(MP3_MAD_MUSIC)

#include "music_mad.h"

#endif

SDL_AudioSpec *Mix_LoadMP3_RW(SDL_RWops *src, int freesrc, SDL_AudioSpec *spec, Uint8 **audio_buf, Uint32 *audio_len)

{

/* note: spec is initialized to mixer spec */

#if defined(MP3_MUSIC)

SMPEG* mp3;

SMPEG_Info info;

#elif defined(MP3_MAD_MUSIC)

mad_data *mp3_mad;

#endif

long samplesize;

int read_len;

const Uint32 chunk_len = 4096;

int err = 0;

if ((!src) || (!spec) || (!audio_buf) || (!audio_len))

{

return NULL;

}

if (!err)

{

*audio_len = 0;

*audio_buf = (Uint8*) SDL_malloc(chunk_len);

err = (*audio_buf == NULL);

}

if (!err)

{

err = ((Mix_Init(MIX_INIT_MP3) & MIX_INIT_MP3) == 0);

}

if (!err)

{

#if defined(MP3_MUSIC)

mp3 = smpeg.SMPEG_new_rwops(src, &info, freesrc, 0);

err = (mp3 == NULL);

#elif defined(MP3_MAD_MUSIC)

mp3_mad = mad_openFileRW(src, spec, freesrc);

err = (mp3_mad == NULL);

#endif

}

#if defined(MP3_MUSIC)

if (!err)

{

err = !info.has_audio;

}

#endif

if (!err)

{

#if defined(MP3_MUSIC)

smpeg.SMPEG_actualSpec(mp3, spec);

smpeg.SMPEG_enableaudio(mp3, 1);

smpeg.SMPEG_enablevideo(mp3, 0);

smpeg.SMPEG_play(mp3);

/* read once for audio length */

while ((read_len = smpeg.SMPEG_playAudio(mp3, *audio_buf, chunk_len)) > 0)

{

*audio_len += read_len;

}

smpeg.SMPEG_stop(mp3);

#elif defined(MP3_MAD_MUSIC)

mad_start(mp3_mad);

/* read once for audio length */

while ((read_len = mad_getSamples(mp3_mad, *audio_buf, chunk_len)) > 0)

{

*audio_len += read_len;

}

mad_stop(mp3_mad);

#endif

err = (read_len < 0);

}

if (!err)

{

/* reallocate, if needed */

if ((*audio_len > 0) && (*audio_len != chunk_len))

{

*audio_buf = (Uint8*) SDL_realloc(*audio_buf, *audio_len);

err = (*audio_buf == NULL);

}

}

if (!err)

{

/* read again for audio buffer, if needed */

if (*audio_len > chunk_len)

{

#if defined(MP3_MUSIC)

smpeg.SMPEG_rewind(mp3);

smpeg.SMPEG_play(mp3);

err = (*audio_len != smpeg.SMPEG_playAudio(mp3, *audio_buf, *audio_len));

smpeg.SMPEG_stop(mp3);

#elif defined(MP3_MAD_MUSIC)

mad_seek(mp3_mad, 0);

mad_start(mp3_mad);

err = (*audio_len != mad_getSamples(mp3_mad, *audio_buf, *audio_len));

mad_stop(mp3_mad);

#endif

}

}

if (!err)

{

/* Don't return a buffer that isn't a multiple of samplesize */

samplesize = ((spec->format & 0xFF)/8)*spec->channels;

*audio_len &= ~(samplesize-1);

}

#if defined(MP3_MUSIC)

if (mp3)

{

smpeg.SMPEG_delete(mp3); mp3 = NULL;

/* Deleting the MP3 closed the source if desired */

freesrc = SDL_FALSE;

}

#elif defined(MP3_MAD_MUSIC)

if (mp3_mad)

{

mad_closeFile(mp3_mad); mp3_mad = NULL;

/* Deleting the MP3 closed the source if desired */

freesrc = SDL_FALSE;

}

#endif

if (freesrc)

{

SDL_RWclose(src); src = NULL;

}

/* handle error */

if (err)

{

if (*audio_buf != NULL)

{

SDL_free(*audio_buf); *audio_buf = NULL;

}

*audio_len = 0;

spec = NULL;

}

return spec;

}

#endif