www.pudn.com > mixxx-1.5.0.zip > samplerate.c
/*
** Copyright (C) 2002,2003 Erik de Castro Lopo
**
** 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 2 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.
**
** You should have received a copy of the GNU 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
#include
#include
#include "config.h"
#include "samplerate.h"
#include "common.h"
SRC_STATE *
src_new (int converter_type, int channels, int *error)
{ SRC_PRIVATE *psrc ;
if (error)
*error = SRC_ERR_NO_ERROR ;
if (channels < 1)
{ if (error)
*error = SRC_ERR_BAD_CHANNEL_COUNT ;
return NULL ;
} ;
if ((psrc = calloc (1, sizeof (*psrc))) == NULL)
{ if (error)
*error = SRC_ERR_MALLOC_FAILED ;
return NULL ;
} ;
psrc->channels = channels ;
if (sinc_set_converter (psrc, converter_type) != SRC_ERR_NO_ERROR &&
zoh_set_converter (psrc, converter_type) != SRC_ERR_NO_ERROR &&
linear_set_converter (psrc, converter_type) != SRC_ERR_NO_ERROR)
{ if (error)
*error = SRC_ERR_BAD_CONVERTER ;
free (psrc) ;
psrc = NULL ;
} ;
src_reset ((SRC_STATE*) psrc) ;
return (SRC_STATE*) psrc ;
} /* src_new */
SRC_STATE *
src_delete (SRC_STATE *state)
{ SRC_PRIVATE *psrc ;
psrc = (SRC_PRIVATE*) state ;
if (psrc)
{ if (psrc->private_data)
free (psrc->private_data) ;
memset (psrc, 0, sizeof (SRC_PRIVATE)) ;
free (psrc) ;
} ;
return NULL ;
} /* src_state */
int
src_process (SRC_STATE *state, SRC_DATA *data)
{ SRC_PRIVATE *psrc ;
int error ;
psrc = (SRC_PRIVATE*) state ;
if (psrc == NULL)
return SRC_ERR_BAD_STATE ;
if (psrc->process == NULL)
return SRC_ERR_BAD_PROC_PTR ;
/* Check for valid SRC_DATA first. */
if (data == NULL)
return SRC_ERR_BAD_DATA ;
/* Check src_ratio is in range. */
if (data->src_ratio < (1.0 / SRC_MAX_RATIO) || data->src_ratio > (1.0 * SRC_MAX_RATIO))
return SRC_ERR_BAD_SRC_RATIO ;
/* And that data_in and data_out are valid. */
if (data->data_in == NULL || data->data_out == NULL)
return SRC_ERR_BAD_DATA_PTR ;
if (data->data_in == NULL)
data->input_frames = 0 ;
if (data->data_in < data->data_out)
{ if (data->data_in + data->input_frames * psrc->channels > data->data_out)
{ /*-printf ("data_in: %p data_out: %p\n",
data->data_in + data->input_frames * psrc->channels, data->data_out) ;-*/
return SRC_ERR_DATA_OVERLAP ;
} ;
}
else if (data->data_out + data->output_frames * psrc->channels > data->data_in)
{ /*-printf ("data_out: %p (%p) data_in: %p\n", data->data_out,
data->data_out + data->output_frames * psrc->channels, data->data_in) ;-*/
return SRC_ERR_DATA_OVERLAP ;
} ;
if (data->input_frames < 0)
data->input_frames = 0 ;
if (data->output_frames < 0)
data->output_frames = 0 ;
/* Set the input and output counts to zero. */
data->input_frames_used = 0 ;
data->output_frames_gen = 0 ;
/* Special case for when last_ratio has not been set. */
if (psrc->last_ratio < (1.0 / SRC_MAX_RATIO))
psrc->last_ratio = data->src_ratio ;
/* Now process. */
error = psrc->process (psrc, data) ;
return error ;
} /* src_process */
int
src_set_ratio (SRC_STATE *state, double new_ratio)
{ SRC_PRIVATE *psrc ;
psrc = (SRC_PRIVATE*) state ;
if (psrc == NULL)
return SRC_ERR_BAD_STATE ;
if (psrc->process == NULL)
return SRC_ERR_BAD_PROC_PTR ;
psrc->last_ratio = new_ratio ;
return SRC_ERR_NO_ERROR ;
} /* src_set_ratio */
int
src_reset (SRC_STATE *state)
{ SRC_PRIVATE *psrc ;
if ((psrc = (SRC_PRIVATE*) state) == NULL)
return SRC_ERR_BAD_STATE ;
if (psrc->reset != NULL)
psrc->reset (psrc) ;
psrc->last_position = 0.0 ;
psrc->last_ratio = 0.0 ;
psrc->error = SRC_ERR_NO_ERROR ;
return SRC_ERR_NO_ERROR ;
} /* src_reset */
/*==============================================================================
** Control functions.
*/
const char *
src_get_name (int converter_type)
{ const char *desc ;
if ((desc = sinc_get_name (converter_type)) != NULL)
return desc ;
if ((desc = zoh_get_name (converter_type)) != NULL)
return desc ;
if ((desc = linear_get_name (converter_type)) != NULL)
return desc ;
return NULL ;
} /* src_get_name */
const char *
src_get_description (int converter_type)
{ const char *desc ;
if ((desc = sinc_get_description (converter_type)) != NULL)
return desc ;
if ((desc = zoh_get_description (converter_type)) != NULL)
return desc ;
if ((desc = linear_get_description (converter_type)) != NULL)
return desc ;
return NULL ;
} /* src_get_description */
const char *
src_get_version (void)
{ return PACKAGE "-" VERSION ;
} /* src_get_version */
int
src_is_valid_ratio (double ratio)
{
if (ratio < (1.0 / SRC_MAX_RATIO) || ratio > (1.0 * SRC_MAX_RATIO))
return SRC_FALSE ;
return SRC_TRUE ;
} /* src_is_valid_ratio */
/*==============================================================================
** Error reporting functions.
*/
int
src_error (SRC_STATE *state)
{ if (state)
return ((SRC_PRIVATE*) state)->error ;
return SRC_ERR_NO_ERROR ;
} /* src_error */
const char*
src_strerror (int error)
{
switch (error)
{ case SRC_ERR_NO_ERROR :
return "No error" ;
case SRC_ERR_MALLOC_FAILED :
return "Malloc failed." ;
case SRC_ERR_BAD_STATE :
return "SRC_STATE pointer is NULL." ;
case SRC_ERR_BAD_DATA :
return "SRC_DATA pointer is NULL." ;
case SRC_ERR_BAD_DATA_PTR :
return "SRC_DATA->data_out is NULL." ;
case SRC_ERR_NO_PRIVATE :
return "Internal error. No private data." ;
case SRC_ERR_BAD_SRC_RATIO :
return "SRC ratio outside [-12, 12] range." ;
case SRC_ERR_BAD_SINC_STATE :
return "src_process() called without reset after end_of_input." ;
case SRC_ERR_BAD_PROC_PTR :
return "Internal error. No process pointer." ;
case SRC_ERR_SHIFT_BITS :
return "Internal error. SHIFT_BITS too large." ;
case SRC_ERR_FILTER_LEN :
return "Internal error. Filter length too large." ;
case SRC_ERR_BAD_CONVERTER :
return "Bad converter number." ;
case SRC_ERR_BAD_CHANNEL_COUNT :
return "Channel count must be >= 1." ;
case SRC_ERR_SINC_BAD_BUFFER_LEN :
return "Internal error. Bad buffer length. Please report this." ;
case SRC_ERR_SIZE_INCOMPATIBILITY :
return "Internal error. Input data / internal buffer size difference. Please report this." ;
case SRC_ERR_BAD_PRIV_PTR :
return "Internal error. Private pointer is NULL. Please report this." ;
case SRC_ERR_DATA_OVERLAP :
return "Input and output data arrays overlap." ;
case SRC_ERR_MAX_ERROR :
return "Placeholder. No error defined for this error number." ;
default : break ;
}
return NULL ;
} /* src_strerror */
/*==============================================================================
** Simple interface for performing a single conversion from input buffer to
** output buffer at a fixed conversion ratio.
*/
int
src_simple (SRC_DATA *src_data, int converter, int channels)
{ SRC_STATE *src_state ;
int error ;
if ((src_state = src_new (converter, channels, &error)) == NULL)
return error ;
src_data->end_of_input = 1 ; /* Only one buffer worth of input. */
error = src_process (src_state, src_data) ;
src_state = src_delete (src_state) ;
return error ;
} /* src_simple */