2 ** Copyright (c) 2002-2021, Erik de Castro Lopo <erikd@mega-nerd.com>
3 ** All rights reserved.
5 ** This code is released under 2-clause BSD license. Please see the
50 /*----------------------------------------------------------------------------------------
59 	if (data->input_frames <= 0)  in linear_vari_process()
62 	if (state->private_data == NULL)  in linear_vari_process()
65 	priv = (LINEAR_DATA*) state->private_data ;  in linear_vari_process()
67 	if (!priv->dirty)  in linear_vari_process()
69 		for (ch = 0 ; ch < state->channels ; ch++)  in linear_vari_process()
70 			priv->last_value [ch] = data->data_in [ch] ;  in linear_vari_process()
71 		priv->dirty = true ;  in linear_vari_process()
74 	priv->in_count = data->input_frames * state->channels ;  in linear_vari_process()
75 	priv->out_count = data->output_frames * state->channels ;  in linear_vari_process()
76 	priv->in_used = priv->out_gen = 0 ;  in linear_vari_process()
78 	src_ratio = state->last_ratio ;  in linear_vari_process()
83 	input_index = state->last_position ;  in linear_vari_process()
86 	while (input_index < 1.0 && priv->out_gen < priv->out_count)  in linear_vari_process()
88 		if (priv->in_used + state->channels * (1.0 + input_index) >= priv->in_count)  in linear_vari_process()
91 		if (priv->out_count > 0 && fabs (state->last_ratio - data->src_ratio) > SRC_MIN_RATIO_DIFF)  in linear_vari_process()
92 …src_ratio = state->last_ratio + priv->out_gen * (data->src_ratio - state->last_ratio) / priv->out_…  in linear_vari_process()
94 		for (ch = 0 ; ch < state->channels ; ch++)  in linear_vari_process()
95 		{	data->data_out [priv->out_gen] = (float) (priv->last_value [ch] + input_index *  in linear_vari_process()
96 										((double) data->data_in [ch] - priv->last_value [ch])) ;  in linear_vari_process()
97 			priv->out_gen ++ ;  in linear_vari_process()
105 	priv->in_used += state->channels * lrint (input_index - rem) ;  in linear_vari_process()
109 …while (priv->out_gen < priv->out_count && priv->in_used + state->channels * input_index < priv->in…  in linear_vari_process()
111 		if (priv->out_count > 0 && fabs (state->last_ratio - data->src_ratio) > SRC_MIN_RATIO_DIFF)  in linear_vari_process()
112 …src_ratio = state->last_ratio + priv->out_gen * (data->src_ratio - state->last_ratio) / priv->out_…  in linear_vari_process()
115 		if (priv->in_used < state->channels && input_index < 1.0)  in linear_vari_process()
116 …{	printf ("Whoops!!!!   in_used : %ld     channels : %d     input_index : %f\n", priv->in_used, st…  in linear_vari_process()
121 		for (ch = 0 ; ch < state->channels ; ch++)  in linear_vari_process()
122 …{	data->data_out [priv->out_gen] = (float) (data->data_in [priv->in_used - state->channels + ch] +…  in linear_vari_process()
123 …((double) data->data_in [priv->in_used + ch] - data->data_in [priv->in_used - state->channels + ch…  in linear_vari_process()
124 			priv->out_gen ++ ;  in linear_vari_process()
131 		priv->in_used += state->channels * lrint (input_index - rem) ;  in linear_vari_process()
135 	if (priv->in_used > priv->in_count)  in linear_vari_process()
136 	{	input_index += (priv->in_used - priv->in_count) / state->channels ;  in linear_vari_process()
137 		priv->in_used = priv->in_count ;  in linear_vari_process()
140 	state->last_position = input_index ;  in linear_vari_process()
142 	if (priv->in_used > 0)  in linear_vari_process()
143 		for (ch = 0 ; ch < state->channels ; ch++)  in linear_vari_process()
144 			priv->last_value [ch] = data->data_in [priv->in_used - state->channels + ch] ;  in linear_vari_process()
147 	state->last_ratio = src_ratio ;  in linear_vari_process()
149 	data->input_frames_used = priv->in_used / state->channels ;  in linear_vari_process()
150 	data->output_frames_gen = priv->out_gen / state->channels ;  in linear_vari_process()
155 /*------------------------------------------------------------------------------
179 linear_data_new (int channels)  in linear_data_new()  argument
181 	assert (channels > 0) ;  in linear_data_new()
186 		priv->linear_magic_marker = LINEAR_MAGIC_MARKER ;  in linear_data_new()
187 		priv->last_value = (float *) calloc (channels, sizeof (float)) ;  in linear_data_new()
188 		if (!priv->last_value)  in linear_data_new()
199 linear_state_new (int channels, SRC_ERROR *error)  in linear_state_new()  argument
201 	assert (channels > 0) ;  in linear_state_new()
211 	state->channels = channels ;  in linear_state_new()
212 	state->mode = SRC_MODE_PROCESS ;  in linear_state_new()
214 	state->private_data = linear_data_new (state->channels) ;  in linear_state_new()
215 	if (!state->private_data)  in linear_state_new()
222 	state->vt = &linear_state_vt ;  in linear_state_new()
238 	priv = (LINEAR_DATA*) state->private_data ;  in linear_reset()
242 	priv->dirty = false ;  in linear_reset()
243 	memset (priv->last_value, 0, sizeof (priv->last_value [0]) * state->channels) ;  in linear_reset()
253 	if (state->private_data == NULL)  in linear_copy()
261 	LINEAR_DATA* from_priv = (LINEAR_DATA*) state->private_data ;  in linear_copy()
270 	to_priv->last_value = (float *) malloc (sizeof (float) * state->channels) ;  in linear_copy()
271 	if (!to_priv->last_value)  in linear_copy()
277 	memcpy (to_priv->last_value, from_priv->last_value, sizeof (float) * state->channels) ;  in linear_copy()
279 	to->private_data = to_priv ;  in linear_copy()
289 		LINEAR_DATA *linear = (LINEAR_DATA *) state->private_data ;  in linear_close()
292 			if (linear->last_value)  in linear_close()
294 				free (linear->last_value) ;  in linear_close()
295 				linear->last_value = NULL ;  in linear_close()