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- /*
- ** 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/erikd/libsamplerate/blob/master/COPYING
- */
-
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
-
- #include "config.h"
-
- #include "samplerate.h"
- #include "float_cast.h"
- #include "common.h"
-
- static int psrc_set_converter (SRC_PRIVATE *psrc, int converter_type) ;
-
-
- 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 ;
- psrc->mode = SRC_MODE_PROCESS ;
-
- if (psrc_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_callback_new (src_callback_t func, int converter_type, int channels, int *error, void* cb_data)
- { SRC_STATE *src_state ;
-
- if (func == NULL)
- { if (error)
- *error = SRC_ERR_BAD_CALLBACK ;
- return NULL ;
- } ;
-
- if (error != NULL)
- *error = 0 ;
-
- if ((src_state = src_new (converter_type, channels, error)) == NULL)
- return NULL ;
-
- src_reset (src_state) ;
-
- ((SRC_PRIVATE*) src_state)->mode = SRC_MODE_CALLBACK ;
- ((SRC_PRIVATE*) src_state)->callback_func = func ;
- ((SRC_PRIVATE*) src_state)->user_callback_data = cb_data ;
-
- return src_state ;
- } /* src_callback_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->vari_process == NULL || psrc->const_process == NULL)
- return SRC_ERR_BAD_PROC_PTR ;
-
- if (psrc->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->data_out == NULL)
- 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 * psrc->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 * psrc->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 (psrc->last_ratio < (1.0 / SRC_MAX_RATIO))
- psrc->last_ratio = data->src_ratio ;
-
- /* Now process. */
- if (fabs (psrc->last_ratio - data->src_ratio) < 1e-15)
- error = psrc->const_process (psrc, data) ;
- else
- error = psrc->vari_process (psrc, data) ;
-
- return error ;
- } /* src_process */
-
- long
- src_callback_read (SRC_STATE *state, double src_ratio, long frames, float *data)
- { SRC_PRIVATE *psrc ;
- SRC_DATA src_data ;
-
- long output_frames_gen ;
- int error = 0 ;
-
- if (state == NULL)
- return 0 ;
-
- if (frames <= 0)
- return 0 ;
-
- psrc = (SRC_PRIVATE*) state ;
-
- if (psrc->mode != SRC_MODE_CALLBACK)
- { psrc->error = SRC_ERR_BAD_MODE ;
- return 0 ;
- } ;
-
- if (psrc->callback_func == NULL)
- { psrc->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))
- { psrc->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 = psrc->saved_data ;
- src_data.input_frames = psrc->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 = psrc->callback_func (psrc->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.
- */
- psrc->mode = SRC_MODE_PROCESS ;
- error = src_process (state, &src_data) ;
- psrc->mode = SRC_MODE_CALLBACK ;
-
- if (error != 0)
- break ;
-
- src_data.data_in += src_data.input_frames_used * psrc->channels ;
- src_data.input_frames -= src_data.input_frames_used ;
-
- src_data.data_out += src_data.output_frames_gen * psrc->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 ;
- } ;
-
- psrc->saved_data = src_data.data_in ;
- psrc->saved_frames = src_data.input_frames ;
-
- if (error != 0)
- { psrc->error = error ;
- return 0 ;
- } ;
-
- return output_frames_gen ;
- } /* src_callback_read */
-
- /*==========================================================================
- */
-
- 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->vari_process == NULL || psrc->const_process == NULL)
- return SRC_ERR_BAD_PROC_PTR ;
-
- if (is_bad_src_ratio (new_ratio))
- return SRC_ERR_BAD_SRC_RATIO ;
-
- psrc->last_ratio = new_ratio ;
-
- return SRC_ERR_NO_ERROR ;
- } /* src_set_ratio */
-
- int
- src_get_channels (SRC_STATE *state)
- { SRC_PRIVATE *psrc ;
-
- psrc = (SRC_PRIVATE*) state ;
-
- if (psrc == NULL)
- return SRC_ERR_BAD_STATE ;
- if (psrc->vari_process == NULL || psrc->const_process == NULL)
- return SRC_ERR_BAD_PROC_PTR ;
-
- return psrc->channels ;
- } /* src_get_channels */
-
- 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->saved_data = NULL ;
- psrc->saved_frames = 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 " (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 ((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 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)
- { double scaled_value ;
-
- while (len)
- { len -- ;
-
- scaled_value = in [len] * (8.0 * 0x10000000) ;
- if (CPU_CLIPS_POSITIVE == 0 && scaled_value >= (1.0 * 0x7FFFFFFF))
- { out [len] = 32767 ;
- continue ;
- } ;
- if (CPU_CLIPS_NEGATIVE == 0 && scaled_value <= (-8.0 * 0x10000000))
- { out [len] = -32768 ;
- continue ;
- } ;
-
- out [len] = (short) (lrint (scaled_value) >> 16) ;
- } ;
-
- } /* 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 && scaled_value >= (1.0 * 0x7FFFFFFF))
- { out [len] = 0x7fffffff ;
- continue ;
- } ;
- if (CPU_CLIPS_NEGATIVE == 0 && scaled_value <= (-8.0 * 0x10000000))
- { out [len] = -1 - 0x7fffffff ;
- continue ;
- } ;
-
- out [len] = lrint (scaled_value) ;
- } ;
-
- } /* src_float_to_int_array */
-
- /*==============================================================================
- ** Private functions.
- */
-
- static int
- psrc_set_converter (SRC_PRIVATE *psrc, int converter_type)
- {
- if (sinc_set_converter (psrc, converter_type) == SRC_ERR_NO_ERROR)
- return SRC_ERR_NO_ERROR ;
-
- if (zoh_set_converter (psrc, converter_type) == SRC_ERR_NO_ERROR)
- return SRC_ERR_NO_ERROR ;
-
- if (linear_set_converter (psrc, converter_type) == SRC_ERR_NO_ERROR)
- return SRC_ERR_NO_ERROR ;
-
- return SRC_ERR_BAD_CONVERTER ;
- } /* psrc_set_converter */
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