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302 lines
7.6 KiB
302 lines
7.6 KiB
/*
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** Copyright (C) 2002,2003 Erik de Castro Lopo <erikd@mega-nerd.com>
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**
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** This program is free software; you can redistribute it and/or modify
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** it under the terms of the GNU General Public License as published by
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** the Free Software Foundation; either version 2 of the License, or
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** (at your option) any later version.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU General Public License for more details.
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**
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** You should have received a copy of the GNU General Public License
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** along with this program; if not, write to the Free Software
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** Foundation, Inc., 51 Franklin Steet, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "config.h"
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#include "samplerate.h"
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#include "common.h"
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SRC_STATE *
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src_new (int converter_type, int channels, int *error)
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{ SRC_PRIVATE *psrc ;
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if (error)
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*error = SRC_ERR_NO_ERROR ;
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if (channels < 1)
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{ if (error)
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*error = SRC_ERR_BAD_CHANNEL_COUNT ;
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return NULL ;
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} ;
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if ((psrc = calloc (1, sizeof (*psrc))) == NULL)
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{ if (error)
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*error = SRC_ERR_MALLOC_FAILED ;
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return NULL ;
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} ;
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psrc->channels = channels ;
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if (sinc_set_converter (psrc, converter_type) != SRC_ERR_NO_ERROR &&
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zoh_set_converter (psrc, converter_type) != SRC_ERR_NO_ERROR &&
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linear_set_converter (psrc, converter_type) != SRC_ERR_NO_ERROR)
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{ if (error)
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*error = SRC_ERR_BAD_CONVERTER ;
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free (psrc) ;
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psrc = NULL ;
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} ;
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src_reset ((SRC_STATE*) psrc) ;
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return (SRC_STATE*) psrc ;
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} /* src_new */
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SRC_STATE *
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src_delete (SRC_STATE *state)
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{ SRC_PRIVATE *psrc ;
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psrc = (SRC_PRIVATE*) state ;
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if (psrc)
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{ if (psrc->private_data)
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free (psrc->private_data) ;
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memset (psrc, 0, sizeof (SRC_PRIVATE)) ;
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free (psrc) ;
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} ;
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return NULL ;
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} /* src_state */
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int
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src_process (SRC_STATE *state, SRC_DATA *data)
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{ SRC_PRIVATE *psrc ;
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int error ;
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psrc = (SRC_PRIVATE*) state ;
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if (psrc == NULL)
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return SRC_ERR_BAD_STATE ;
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if (psrc->process == NULL)
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return SRC_ERR_BAD_PROC_PTR ;
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/* Check for valid SRC_DATA first. */
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if (data == NULL)
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return SRC_ERR_BAD_DATA ;
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/* Check src_ratio is in range. */
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if (data->src_ratio < (1.0 / SRC_MAX_RATIO) || data->src_ratio > (1.0 * SRC_MAX_RATIO))
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return SRC_ERR_BAD_SRC_RATIO ;
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/* And that data_in and data_out are valid. */
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if (data->data_in == NULL || data->data_out == NULL)
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return SRC_ERR_BAD_DATA_PTR ;
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if (data->data_in == NULL)
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data->input_frames = 0 ;
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if (data->data_in < data->data_out)
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{ if (data->data_in + data->input_frames * psrc->channels > data->data_out)
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{ /*-printf ("data_in: %p data_out: %p\n",
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data->data_in + data->input_frames * psrc->channels, data->data_out) ;-*/
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return SRC_ERR_DATA_OVERLAP ;
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} ;
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}
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else if (data->data_out + data->output_frames * psrc->channels > data->data_in)
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{ /*-printf ("data_out: %p (%p) data_in: %p\n", data->data_out,
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data->data_out + data->output_frames * psrc->channels, data->data_in) ;-*/
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return SRC_ERR_DATA_OVERLAP ;
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} ;
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if (data->input_frames < 0)
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data->input_frames = 0 ;
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if (data->output_frames < 0)
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data->output_frames = 0 ;
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/* Set the input and output counts to zero. */
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data->input_frames_used = 0 ;
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data->output_frames_gen = 0 ;
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/* Special case for when last_ratio has not been set. */
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if (psrc->last_ratio < (1.0 / SRC_MAX_RATIO))
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psrc->last_ratio = data->src_ratio ;
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/* Now process. */
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error = psrc->process (psrc, data) ;
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return error ;
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} /* src_process */
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int
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src_set_ratio (SRC_STATE *state, double new_ratio)
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{ SRC_PRIVATE *psrc ;
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psrc = (SRC_PRIVATE*) state ;
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if (psrc == NULL)
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return SRC_ERR_BAD_STATE ;
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if (psrc->process == NULL)
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return SRC_ERR_BAD_PROC_PTR ;
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psrc->last_ratio = new_ratio ;
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return SRC_ERR_NO_ERROR ;
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} /* src_set_ratio */
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int
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src_reset (SRC_STATE *state)
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{ SRC_PRIVATE *psrc ;
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if ((psrc = (SRC_PRIVATE*) state) == NULL)
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return SRC_ERR_BAD_STATE ;
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if (psrc->reset != NULL)
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psrc->reset (psrc) ;
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psrc->last_position = 0.0 ;
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psrc->last_ratio = 0.0 ;
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psrc->error = SRC_ERR_NO_ERROR ;
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return SRC_ERR_NO_ERROR ;
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} /* src_reset */
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/*==============================================================================
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** Control functions.
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*/
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const char *
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src_get_name (int converter_type)
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{ const char *desc ;
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if ((desc = sinc_get_name (converter_type)) != NULL)
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return desc ;
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if ((desc = zoh_get_name (converter_type)) != NULL)
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return desc ;
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if ((desc = linear_get_name (converter_type)) != NULL)
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return desc ;
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return NULL ;
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} /* src_get_name */
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const char *
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src_get_description (int converter_type)
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{ const char *desc ;
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if ((desc = sinc_get_description (converter_type)) != NULL)
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return desc ;
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if ((desc = zoh_get_description (converter_type)) != NULL)
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return desc ;
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if ((desc = linear_get_description (converter_type)) != NULL)
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return desc ;
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return NULL ;
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} /* src_get_description */
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const char *
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src_get_version (void)
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{ return "libsamplerate-k3b";/*PACKAGE "-" VERSION ;*/
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} /* src_get_version */
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int
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src_is_valid_ratio (double ratio)
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{
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if (ratio < (1.0 / SRC_MAX_RATIO) || ratio > (1.0 * SRC_MAX_RATIO))
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return SRC_FALSE ;
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return SRC_TRUE ;
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} /* src_is_valid_ratio */
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/*==============================================================================
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** Error reporting functions.
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*/
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int
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src_error (SRC_STATE *state)
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{ if (state)
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return ((SRC_PRIVATE*) state)->error ;
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return SRC_ERR_NO_ERROR ;
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} /* src_error */
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const char*
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src_strerror (int error)
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{
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switch (error)
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{ case SRC_ERR_NO_ERROR :
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return "No error" ;
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case SRC_ERR_MALLOC_FAILED :
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return "Malloc failed." ;
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case SRC_ERR_BAD_STATE :
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return "SRC_STATE pointer is NULL." ;
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case SRC_ERR_BAD_DATA :
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return "SRC_DATA pointer is NULL." ;
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case SRC_ERR_BAD_DATA_PTR :
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return "SRC_DATA->data_out is NULL." ;
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case SRC_ERR_NO_PRIVATE :
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return "Internal error. No private data." ;
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case SRC_ERR_BAD_SRC_RATIO :
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return "SRC ratio outside [-12, 12] range." ;
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case SRC_ERR_BAD_SINC_STATE :
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return "src_process() called without reset after end_of_input." ;
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case SRC_ERR_BAD_PROC_PTR :
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return "Internal error. No process pointer." ;
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case SRC_ERR_SHIFT_BITS :
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return "Internal error. SHIFT_BITS too large." ;
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case SRC_ERR_FILTER_LEN :
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return "Internal error. Filter length too large." ;
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case SRC_ERR_BAD_CONVERTER :
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return "Bad converter number." ;
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case SRC_ERR_BAD_CHANNEL_COUNT :
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return "Channel count must be >= 1." ;
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case SRC_ERR_SINC_BAD_BUFFER_LEN :
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return "Internal error. Bad buffer length. Please report this." ;
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case SRC_ERR_SIZE_INCOMPATIBILITY :
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return "Internal error. Input data / internal buffer size difference. Please report this." ;
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case SRC_ERR_BAD_PRIV_PTR :
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return "Internal error. Private pointer is NULL. Please report this." ;
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case SRC_ERR_DATA_OVERLAP :
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return "Input and output data arrays overlap." ;
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case SRC_ERR_MAX_ERROR :
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return "Placeholder. No error defined for this error number." ;
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default : break ;
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}
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return NULL ;
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} /* src_strerror */
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/*==============================================================================
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** Simple interface for performing a single conversion from input buffer to
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** output buffer at a fixed conversion ratio.
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*/
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int
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src_simple (SRC_DATA *src_data, int converter, int channels)
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{ SRC_STATE *src_state ;
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int error ;
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if ((src_state = src_new (converter, channels, &error)) == NULL)
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return error ;
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src_data->end_of_input = 1 ; /* Only one buffer worth of input. */
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error = src_process (src_state, src_data) ;
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src_state = src_delete (src_state) ;
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return error ;
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} /* src_simple */
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