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Date: Sun, 4 Jan 2004 23:48:19 +0100 From: Max Horn Subject: Re: Again Audio CD patch Am 04.01.2004 um 22:38 schrieb Sam Lantinga: > > Okay, I fixed the buffering problems by simply using a 4 second buffer > instead of a 1 second buffer. However, using your code I can't play an > entire CD - the playback stops after the first song. > Found the problem: FSReadFork returns eofErr when the file is finished. However, we check its return value for errors, and if anything but noErr occurs, the reader thread aborts its current iteration. That is bad, because it aborts before it can ever set the flag which tells that the file is over (also, any remaining data which FSRead did return is lost - so you'd not hear about to 4 seconds from the end of the file. Furthermore, the computed data size was 8 bytes to high (I forgot to account for the fact that the size of an (A)IFF chunk always contains the chunk header & size fields, too). This is enough to make it work. However, the end condition is rather fragile, so I tuned some other things to be pessimistic (check for <= 0 instead of == 0, when eofErr is encountered enforce mReadFilePosition == mFileLength). You never know... The attached patch fixes the issue for me.
author Sam Lantinga <slouken@libsdl.org>
date Mon, 05 Jan 2004 00:57:51 +0000
parents 74212992fb08
children bb5ace455586
line wrap: on
line source

/*
   Header definitions for the MMX routines for the HERMES library
   Copyright (c) 1998 Christian Nentwich (c.nentwich@cs.ucl.ac.uk)
   This source code is licensed under the GNU LGPL
  
   Please refer to the file COPYING.LIB contained in the distribution for
   licensing conditions
*/

#ifndef __HERMES_HEAD_MMX__
#define __HERMES_HEAD_MMX__


/* If you cannot stand ifdefs, then please do not look into this file, it's
   going to end your life :) */

#ifdef X86_ASSEMBLER


#ifdef __cplusplus
extern "C" {
#endif

void STACKCALL ConvertMMX(HermesConverterInterface *);

void STACKCALL ClearMMX_32(HermesClearInterface *);
void STACKCALL ClearMMX_24(HermesClearInterface *);
void STACKCALL ClearMMX_16(HermesClearInterface *);
void STACKCALL ClearMMX_8(HermesClearInterface *);

void ConvertMMXpII32_24RGB888();
void ConvertMMXpII32_16RGB565();
void ConvertMMXpII32_16BGR565();
void ConvertMMXpII32_16RGB555();
void ConvertMMXpII32_16BGR565();
void ConvertMMXpII32_16BGR555();

void ConvertMMXp32_16RGB555();

#ifdef __cplusplus
}
#endif



/* Fix the underscore business with ELF compilers */

#if defined(__ELF__) && defined(__GNUC__)
  #ifdef __cplusplus 
  extern "C" {   
  #endif

  void ConvertMMX(HermesConverterInterface *) __attribute__ ((alias ("_ConvertMMX")));
#if 0
  void ClearMMX_32(HermesClearInterface *) __attribute__ ((alias ("_ClearMMX_32")));
  void ClearMMX_24(HermesClearInterface *)  __attribute__ ((alias ("_ClearMMX_24")));
  void ClearMMX_16(HermesClearInterface *)  __attribute__ ((alias ("_ClearMMX_16")));
  void ClearMMX_8(HermesClearInterface *)  __attribute__ ((alias ("_ClearMMX_8")));

  void ConvertMMXp32_16RGB555() __attribute__ ((alias ("_ConvertMMXp32_16RGB555")));
#endif

  void ConvertMMXpII32_24RGB888() __attribute__ ((alias ("_ConvertMMXpII32_24RGB888")));
  void ConvertMMXpII32_16RGB565() __attribute__ ((alias ("_ConvertMMXpII32_16RGB565")));
  void ConvertMMXpII32_16BGR565() __attribute__ ((alias ("_ConvertMMXpII32_16BGR565")));
  void ConvertMMXpII32_16RGB555() __attribute__ ((alias ("_ConvertMMXpII32_16RGB555")));
  void ConvertMMXpII32_16BGR555() __attribute__ ((alias ("_ConvertMMXpII32_16BGR555")));

  #ifdef __cplusplus
  }
  #endif

#endif /* ELF and GNUC */




/* Make it work with Watcom */
#ifdef __WATCOMC__
#pragma warning 601 9

#pragma aux ConvertMMX "_*" modify [EAX EBX ECX EDX ESI EDI]

#pragma aux ClearMMX_32 "_*" modify [EAX EBX ECX EDX ESI EDI]
#pragma aux ClearMMX_24 "_*" modify [EAX EBX ECX EDX ESI EDI]
#pragma aux ClearMMX_16 "_*" modify [EAX EBX ECX EDX ESI EDI]
#pragma aux ClearMMX_8 "_*" modify [EAX EBX ECX EDX ESI EDI]

#pragma aux ConvertMMXpII32_24RGB888 "_*"
#pragma aux ConvertMMXpII32_16RGB565 "_*"
#pragma aux ConvertMMXpII32_16BGR565 "_*"
#pragma aux ConvertMMXpII32_16RGB555 "_*"
#pragma aux ConvertMMXpII32_16BGR555 "_*"
#pragma aux ConvertMMXp32_16RGB555 "_*"

#endif /* WATCOM */

#endif /* X86_ASSEMBLER */


#endif