ref: 06a021bb7ab5a85975a6e27b7cc5255768df3666
dir: libsamplerate/src/samplerate.c
/*
** Copyright (c) 2002-2016, Erik de Castro Lopo <erikd@mega-nerd.com>
** All rights reserved.
**
** This code is released under 2-clause BSD license. Please see the
** file at : https://github.com/libsndfile/libsamplerate/blob/master/COPYING
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "src_config.h"
#include "samplerate.h"
#include "common.h"
static SRC_STATE *psrc_set_converter (int converter_type, int channels, int *error) ;
SRC_STATE *
src_new (int converter_type, int channels, int *error)
{
return psrc_set_converter (converter_type, channels, error) ;
} /* src_new */
SRC_STATE*
src_clone (SRC_STATE* orig, int *error)
{
if (!orig)
{
if (error)
*error = SRC_ERR_BAD_STATE ;
return NULL ;
}
if (error)
*error = SRC_ERR_NO_ERROR ;
SRC_STATE *state = orig->vt->copy (orig) ;
if (!state)
if (error)
*error = SRC_ERR_MALLOC_FAILED ;
return state ;
}
SRC_STATE*
src_callback_new (src_callback_t func, int converter_type, int channels, int *error, void* cb_data)
{ SRC_STATE *state ;
if (func == NULL)
{ if (error)
*error = SRC_ERR_BAD_CALLBACK ;
return NULL ;
} ;
if (error != NULL)
*error = 0 ;
if ((state = src_new (converter_type, channels, error)) == NULL)
return NULL ;
src_reset (state) ;
state->mode = SRC_MODE_CALLBACK ;
state->callback_func = func ;
state->user_callback_data = cb_data ;
return state ;
} /* src_callback_new */
SRC_STATE *
src_delete (SRC_STATE *state)
{
if (state)
state->vt->close (state) ;
return NULL ;
} /* src_state */
int
src_process (SRC_STATE *state, SRC_DATA *data)
{
int error ;
if (state == NULL)
return SRC_ERR_BAD_STATE ;
if (state->mode != SRC_MODE_PROCESS)
return SRC_ERR_BAD_MODE ;
/* Check for valid SRC_DATA first. */
if (data == NULL)
return SRC_ERR_BAD_DATA ;
/* And that data_in and data_out are valid. */
if ((data->data_in == NULL && data->input_frames > 0)
|| (data->data_out == NULL && data->output_frames > 0))
return SRC_ERR_BAD_DATA_PTR ;
/* Check src_ratio is in range. */
if (is_bad_src_ratio (data->src_ratio))
return SRC_ERR_BAD_SRC_RATIO ;
if (data->input_frames < 0)
data->input_frames = 0 ;
if (data->output_frames < 0)
data->output_frames = 0 ;
if (data->data_in < data->data_out)
{ if (data->data_in + data->input_frames * state->channels > data->data_out)
{ /*-printf ("\n\ndata_in: %p data_out: %p\n",
(void*) (data->data_in + data->input_frames * psrc->channels), (void*) data->data_out) ;-*/
return SRC_ERR_DATA_OVERLAP ;
} ;
}
else if (data->data_out + data->output_frames * state->channels > data->data_in)
{ /*-printf ("\n\ndata_in : %p ouput frames: %ld data_out: %p\n", (void*) data->data_in, data->output_frames, (void*) data->data_out) ;
printf ("data_out: %p (%p) data_in: %p\n", (void*) data->data_out,
(void*) (data->data_out + data->input_frames * psrc->channels), (void*) data->data_in) ;-*/
return SRC_ERR_DATA_OVERLAP ;
} ;
/* 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 (state->last_ratio < (1.0 / SRC_MAX_RATIO))
state->last_ratio = data->src_ratio ;
/* Now process. */
if (fabs (state->last_ratio - data->src_ratio) < 1e-15)
error = state->vt->const_process (state, data) ;
else
error = state->vt->vari_process (state, data) ;
return error ;
} /* src_process */
long
src_callback_read (SRC_STATE *state, double src_ratio, long frames, float *data)
{
SRC_DATA src_data ;
long output_frames_gen ;
int error = 0 ;
if (state == NULL)
return 0 ;
if (frames <= 0)
return 0 ;
if (state->mode != SRC_MODE_CALLBACK)
{ state->error = SRC_ERR_BAD_MODE ;
return 0 ;
} ;
if (state->callback_func == NULL)
{ state->error = SRC_ERR_NULL_CALLBACK ;
return 0 ;
} ;
memset (&src_data, 0, sizeof (src_data)) ;
/* Check src_ratio is in range. */
if (is_bad_src_ratio (src_ratio))
{ state->error = SRC_ERR_BAD_SRC_RATIO ;
return 0 ;
} ;
/* Switch modes temporarily. */
src_data.src_ratio = src_ratio ;
src_data.data_out = data ;
src_data.output_frames = frames ;
src_data.data_in = state->saved_data ;
src_data.input_frames = state->saved_frames ;
output_frames_gen = 0 ;
while (output_frames_gen < frames)
{ /* Use a dummy array for the case where the callback function
** returns without setting the ptr.
*/
float dummy [1] ;
if (src_data.input_frames == 0)
{ float *ptr = dummy ;
src_data.input_frames = state->callback_func (state->user_callback_data, &ptr) ;
src_data.data_in = ptr ;
if (src_data.input_frames == 0)
src_data.end_of_input = 1 ;
} ;
/*
** Now call process function. However, we need to set the mode
** to SRC_MODE_PROCESS first and when we return set it back to
** SRC_MODE_CALLBACK.
*/
state->mode = SRC_MODE_PROCESS ;
error = src_process (state, &src_data) ;
state->mode = SRC_MODE_CALLBACK ;
if (error != 0)
break ;
src_data.data_in += src_data.input_frames_used * state->channels ;
src_data.input_frames -= src_data.input_frames_used ;
src_data.data_out += src_data.output_frames_gen * state->channels ;
src_data.output_frames -= src_data.output_frames_gen ;
output_frames_gen += src_data.output_frames_gen ;
if (src_data.end_of_input == SRC_TRUE && src_data.output_frames_gen == 0)
break ;
} ;
state->saved_data = src_data.data_in ;
state->saved_frames = src_data.input_frames ;
if (error != 0)
{ state->error = (SRC_ERROR) error ;
return 0 ;
} ;
return output_frames_gen ;
} /* src_callback_read */
/*==========================================================================
*/
int
src_set_ratio (SRC_STATE *state, double new_ratio)
{
if (state == NULL)
return SRC_ERR_BAD_STATE ;
if (is_bad_src_ratio (new_ratio))
return SRC_ERR_BAD_SRC_RATIO ;
state->last_ratio = new_ratio ;
return SRC_ERR_NO_ERROR ;
} /* src_set_ratio */
int
src_get_channels (SRC_STATE *state)
{
if (state == NULL)
return -SRC_ERR_BAD_STATE ;
return state->channels ;
} /* src_get_channels */
int
src_reset (SRC_STATE *state)
{
if (state == NULL)
return SRC_ERR_BAD_STATE ;
state->vt->reset (state) ;
state->last_position = 0.0 ;
state->last_ratio = 0.0 ;
state->saved_data = NULL ;
state->saved_frames = 0 ;
state->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 " (c) 2002-2008 Erik de Castro Lopo" ;
} /* src_get_version */
int
src_is_valid_ratio (double ratio)
{
if (is_bad_src_ratio (ratio))
return SRC_FALSE ;
return SRC_TRUE ;
} /* src_is_valid_ratio */
/*==============================================================================
** Error reporting functions.
*/
int
src_error (SRC_STATE *state)
{ if (state)
return 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 or SRC_DATA->data_in is NULL." ;
case SRC_ERR_NO_PRIVATE :
return "Internal error. No private data." ;
case SRC_ERR_BAD_SRC_RATIO :
return "SRC ratio outside [1/" SRC_MAX_RATIO_STR ", " SRC_MAX_RATIO_STR "] 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_BAD_CALLBACK :
return "Supplied callback function pointer is NULL." ;
case SRC_ERR_BAD_MODE :
return "Calling mode differs from initialisation mode (ie process v callback)." ;
case SRC_ERR_NULL_CALLBACK :
return "Callback function pointer is NULL in src_callback_read ()." ;
case SRC_ERR_NO_VARIABLE_RATIO :
return "This converter only allows constant conversion ratios." ;
case SRC_ERR_SINC_PREPARE_DATA_BAD_LEN :
return "Internal error : Bad length in prepare_data ()." ;
case SRC_ERR_BAD_INTERNAL_STATE :
return "Error : Someone is trampling on my internal state." ;
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_delete (src_state) ;
return error ;
} /* src_simple */
void
src_short_to_float_array (const short *in, float *out, int len)
{
while (len)
{ len -- ;
out [len] = (float) (in [len] / (1.0 * 0x8000)) ;
} ;
return ;
} /* src_short_to_float_array */
void
src_float_to_short_array (const float *in, short *out, int len)
{
while (len)
{ float scaled_value ;
len -- ;
scaled_value = in [len] * 32768.f ;
if (scaled_value >= 32767.f)
out [len] = 32767 ;
else if (scaled_value <= -32768.f)
out [len] = -32768 ;
else
out [len] = (short) (lrintf (scaled_value)) ;
}
} /* src_float_to_short_array */
void
src_int_to_float_array (const int *in, float *out, int len)
{
while (len)
{ len -- ;
out [len] = (float) (in [len] / (8.0 * 0x10000000)) ;
} ;
return ;
} /* src_int_to_float_array */
void
src_float_to_int_array (const float *in, int *out, int len)
{ double scaled_value ;
while (len)
{ len -- ;
scaled_value = in [len] * (8.0 * 0x10000000) ;
#if CPU_CLIPS_POSITIVE == 0
if (scaled_value >= (1.0 * 0x7FFFFFFF))
{ out [len] = 0x7fffffff ;
continue ;
} ;
#endif
#if CPU_CLIPS_NEGATIVE == 0
if (scaled_value <= (-8.0 * 0x10000000))
{ out [len] = -1 - 0x7fffffff ;
continue ;
} ;
#endif
out [len] = (int) lrint (scaled_value) ;
} ;
} /* src_float_to_int_array */
/*==============================================================================
** Private functions.
*/
static SRC_STATE *
psrc_set_converter (int converter_type, int channels, int *error)
{
SRC_ERROR temp_error;
SRC_STATE *state ;
switch (converter_type)
{
case SRC_SINC_BEST_QUALITY :
case SRC_SINC_MEDIUM_QUALITY :
case SRC_SINC_FASTEST :
state = sinc_state_new (converter_type, channels, &temp_error) ;
break ;
case SRC_ZERO_ORDER_HOLD :
state = zoh_state_new (channels, &temp_error) ;
break ;
case SRC_LINEAR :
state = linear_state_new (channels, &temp_error) ;
break ;
default :
temp_error = SRC_ERR_BAD_CONVERTER ;
state = NULL ;
break ;
}
if (error)
*error = (int) temp_error ;
return state ;
} /* psrc_set_converter */