furnace/extern/libsndfile-modified/src/mpeg.c
tildearrow 061991fe60 desubmodulize libsndfile - PLEASE READ
it appears a one-character typo in the cmake_minimum_required line prevents it from compiling under CMake 4.0.
in order to fix that, I had to take this thing out of submodules...

it is recommended to do this after you pull;

git submodule deinit extern/libsndfile
2025-04-02 15:09:53 -05:00

166 lines
4.3 KiB
C

/*
** Copyright (C) 2019 Erik de Castro Lopo <erikd@mega-nerd.com>
** Copyright (C) 2021 Arthur Taylor <art@ified.ca>
**
** This program is free software ; you can redistribute it and/or modify
** it under the terms of the GNU Lesser General Public License as published by
** the Free Software Foundation ; either version 2.1 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 Lesser General Public License for more details.
**
** You should have received a copy of the GNU Lesser General Public License
** along with this program ; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "sfconfig.h"
#include "sndfile.h"
#include "common.h"
#if HAVE_MPEG
#include "mpeg.h"
static int mpeg_write_header (SF_PRIVATE *psf, int calc_length) ;
static int mpeg_command (SF_PRIVATE *psf, int command, void *data, int datasize) ;
/*------------------------------------------------------------------------------
* Private functions
*/
static int
mpeg_write_header (SF_PRIVATE *psf, int UNUSED (calc_length))
{
if (psf->have_written)
return 0 ;
return mpeg_l3_encoder_write_id3tag (psf) ;
}
static int
mpeg_command (SF_PRIVATE *psf, int command, void *data, int datasize)
{ int bitrate_mode ;
switch (command)
{ case SFC_SET_COMPRESSION_LEVEL :
if (data == NULL || datasize != sizeof (double))
{ psf->error = SFE_BAD_COMMAND_PARAM ;
return SF_FALSE ;
} ;
if (psf->file.mode != SFM_WRITE)
{ psf->error = SFE_NOT_WRITEMODE ;
return SF_FALSE ;
} ;
return mpeg_l3_encoder_set_quality (psf, *(double *) data) ;
case SFC_SET_BITRATE_MODE :
if (psf->file.mode != SFM_WRITE)
{ psf->error = SFE_NOT_WRITEMODE ;
return SF_FALSE ;
} ;
if (data == NULL || datasize != sizeof (int))
{ psf->error = SFE_BAD_COMMAND_PARAM ;
return SF_FALSE ;
} ;
bitrate_mode = *(int *) data ;
return mpeg_l3_encoder_set_bitrate_mode (psf, bitrate_mode) ;
case SFC_GET_BITRATE_MODE :
if (psf->file.mode == SFM_READ)
return mpeg_decoder_get_bitrate_mode (psf) ;
else
return mpeg_l3_encoder_get_bitrate_mode (psf) ;
default :
return SF_FALSE ;
} ;
return SF_FALSE ;
} /* mpeg_command */
/*------------------------------------------------------------------------------
* Public functions
*/
int
mpeg_init (SF_PRIVATE *psf, int bitrate_mode, int write_metadata)
{ int error ;
if (psf->file.mode == SFM_RDWR)
return SFE_BAD_MODE_RW ;
if (psf->file.mode == SFM_WRITE)
{ switch (SF_CODEC (psf->sf.format))
{ case SF_FORMAT_MPEG_LAYER_III :
if ((error = mpeg_l3_encoder_init (psf, write_metadata)))
return error ;
mpeg_l3_encoder_set_bitrate_mode (psf, bitrate_mode) ;
if (write_metadata)
{ /* ID3 support */
psf->strings.flags = SF_STR_ALLOW_START ;
psf->write_header = mpeg_write_header ;
} ;
break ;
case SF_FORMAT_MPEG_LAYER_I :
case SF_FORMAT_MPEG_LAYER_II :
psf_log_printf (psf, "MPEG Layer I and II encoding is not yet supported.\n") ;
return SFE_UNIMPLEMENTED ;
default:
psf_log_printf (psf, "%s: bad psf->sf.format 0x%x.\n", __func__, psf->sf.format) ;
return SFE_INTERNAL ;
} ;
} ;
if (psf->file.mode == SFM_READ)
{ if ((error = mpeg_decoder_init (psf)))
return error ;
} ;
return 0 ;
} /* mpeg_init */
int
mpeg_open (SF_PRIVATE *psf)
{ int error ;
/* Choose variable bitrate mode by default for standalone files.*/
if ((error = mpeg_init (psf, SF_BITRATE_MODE_VARIABLE, SF_TRUE)))
return error ;
psf->dataoffset = 0 ;
psf->command = mpeg_command ;
if (psf->filelength != SF_COUNT_MAX)
psf->datalength = psf->filelength - psf->dataoffset ;
else
psf->datalength = SF_COUNT_MAX ;
return 0 ;
} /* mpeg_open */
#else /* HAVE_MPEG */
int
mpeg_init (SF_PRIVATE *psf, int UNUSED (bitrate_mode) , int UNUSED (write_metadata))
{
psf_log_printf (psf, "This version of libsndfile was compiled without MPEG support.\n") ;
return SFE_UNIMPLEMENTED ;
} /* mpeg_init */
int
mpeg_open (SF_PRIVATE *psf)
{
psf_log_printf (psf, "This version of libsndfile was compiled without MP3 support.\n") ;
return SFE_UNIMPLEMENTED ;
} /* mpeg_open */
#endif