Xash3D FWGS engine.
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/*
snd_mp3.c - mp3 format loading and streaming
Copyright (C) 2010 Uncle Mike
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 3 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.
*/
#include "soundlib.h"
#include "libmpg/libmpg.h"
/*
=================================================================
MPEG decompression
=================================================================
*/
qboolean Sound_LoadMPG( const char *name, const byte *buffer, fs_offset_t filesize )
{
void *mpeg;
size_t pos = 0;
size_t bytesWrite = 0;
byte out[OUTBUF_SIZE];
size_t outsize, padsize;
int ret;
wavinfo_t sc;
// load the file
if( !buffer || filesize < FRAME_SIZE )
return false;
// couldn't create decoder
if(( mpeg = create_decoder( &ret )) == NULL )
return false;
if( ret ) Con_DPrintf( S_ERROR "%s\n", get_error( mpeg ));
// trying to read header
if( !feed_mpeg_header( mpeg, buffer, FRAME_SIZE, filesize, &sc ))
{
Con_DPrintf( S_ERROR "Sound_LoadMPG: failed to load (%s): %s\n", name, get_error( mpeg ));
close_decoder( mpeg );
return false;
}
sound.channels = sc.channels;
sound.rate = sc.rate;
sound.width = 2; // always 16-bit PCM
sound.loopstart = -1;
sound.size = ( sound.channels * sound.rate * sound.width ) * ( sc.playtime / 1000 ); // in bytes
padsize = sound.size % FRAME_SIZE;
pos += FRAME_SIZE; // evaluate pos
if( !sound.size )
{
// bad mpeg file ?
Con_DPrintf( S_ERROR "Sound_LoadMPG: (%s) is probably corrupted\n", name );
close_decoder( mpeg );
return false;
}
// add sentinel make sure we not overrun
sound.wav = (byte *)Mem_Calloc( host.soundpool, sound.size + padsize );
sound.type = WF_PCMDATA;
// decompress mpg into pcm wav format
while( bytesWrite < sound.size )
{
int size;
if( feed_mpeg_stream( mpeg, NULL, 0, out, &outsize ) != MP3_OK && outsize <= 0 )
{
const byte *data = buffer + pos;
int bufsize;
// if there are no bytes remainig so we can decompress the new frame
if( pos + FRAME_SIZE > filesize )
bufsize = ( filesize - pos );
else bufsize = FRAME_SIZE;
pos += bufsize;
if( feed_mpeg_stream( mpeg, data, bufsize, out, &outsize ) != MP3_OK )
break; // there was end of the stream
}
if( bytesWrite + outsize > sound.size )
size = ( sound.size - bytesWrite );
else size = outsize;
memcpy( &sound.wav[bytesWrite], out, size );
bytesWrite += size;
}
sound.samples = bytesWrite / ( sound.width * sound.channels );
close_decoder( mpeg );
return true;
}
/*
=================
FS_SeekEx
=================
*/
fs_offset_t FS_SeekEx( file_t *file, fs_offset_t offset, int whence )
{
return FS_Seek( file, offset, whence ) == -1 ? -1 : FS_Tell( file );
}
/*
=================
Stream_OpenMPG
=================
*/
stream_t *Stream_OpenMPG( const char *filename )
{
stream_t *stream;
void *mpeg;
file_t *file;
int ret;
wavinfo_t sc;
file = FS_Open( filename, "rb", false );
if( !file ) return NULL;
// at this point we have valid stream
stream = Mem_Calloc( host.soundpool, sizeof( stream_t ));
stream->file = file;
stream->pos = 0;
// couldn't create decoder
if(( mpeg = create_decoder( &ret )) == NULL )
{
Con_DPrintf( S_ERROR "Stream_OpenMPG: couldn't create decoder: %s\n", get_error( mpeg ) );
Mem_Free( stream );
FS_Close( file );
return NULL;
}
if( ret ) Con_DPrintf( S_ERROR "%s\n", get_error( mpeg ));
// trying to open stream and read header
if( !open_mpeg_stream( mpeg, file, (void*)FS_Read, (void*)FS_SeekEx, &sc ))
{
Con_DPrintf( S_ERROR "Stream_OpenMPG: failed to load (%s): %s\n", filename, get_error( mpeg ));
close_decoder( mpeg );
Mem_Free( stream );
FS_Close( file );
return NULL;
}
stream->buffsize = 0; // how many samples left from previous frame
stream->channels = sc.channels;
stream->rate = sc.rate;
stream->width = 2; // always 16 bit
stream->ptr = mpeg;
stream->type = WF_MPGDATA;
return stream;
}
/*
=================
Stream_ReadMPG
assume stream is valid
=================
*/
int Stream_ReadMPG( stream_t *stream, int needBytes, void *buffer )
{
// buffer handling
int bytesWritten = 0;
void *mpg;
mpg = stream->ptr;
while( 1 )
{
byte *data;
int outsize;
if( !stream->buffsize )
{
if( read_mpeg_stream( mpg, (byte*)stream->temp, &stream->pos ) != MP3_OK )
break; // there was end of the stream
}
// check remaining size
if( bytesWritten + stream->pos > needBytes )
outsize = ( needBytes - bytesWritten );
else outsize = stream->pos;
// copy raw sample to output buffer
data = (byte *)buffer + bytesWritten;
memcpy( data, &stream->temp[stream->buffsize], outsize );
bytesWritten += outsize;
stream->pos -= outsize;
stream->buffsize += outsize;
// continue from this sample on a next call
if( bytesWritten >= needBytes )
return bytesWritten;
stream->buffsize = 0; // no bytes remaining
}
return 0;
}
/*
=================
Stream_SetPosMPG
assume stream is valid
=================
*/
int Stream_SetPosMPG( stream_t *stream, int newpos )
{
if( set_stream_pos( stream->ptr, newpos ) != -1 )
{
// flush any previous data
stream->buffsize = 0;
return true;
}
// failed to seek for some reasons
return false;
}
/*
=================
Stream_GetPosMPG
assume stream is valid
=================
*/
int Stream_GetPosMPG( stream_t *stream )
{
return get_stream_pos( stream->ptr );
}
/*
=================
Stream_FreeMPG
assume stream is valid
=================
*/
void Stream_FreeMPG( stream_t *stream )
{
if( stream->ptr )
{
close_decoder( stream->ptr );
stream->ptr = NULL;
}
if( stream->file )
{
FS_Close( stream->file );
stream->file = NULL;
}
Mem_Free( stream );
}