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
48 /*----------------------------------------------------------------------------------------
57 	if (data->input_frames <= 0)  in zoh_vari_process()
60 	if (state->private_data == NULL)  in zoh_vari_process()
63 	priv = (ZOH_DATA*) state->private_data ;  in zoh_vari_process()
65 	if (!priv->dirty)  in zoh_vari_process()
67 		for (ch = 0 ; ch < state->channels ; ch++)  in zoh_vari_process()
68 			priv->last_value [ch] = data->data_in [ch] ;  in zoh_vari_process()
69 		priv->dirty = true ;  in zoh_vari_process()
72 	priv->in_count = data->input_frames * state->channels ;  in zoh_vari_process()
73 	priv->out_count = data->output_frames * state->channels ;  in zoh_vari_process()
74 	priv->in_used = priv->out_gen = 0 ;  in zoh_vari_process()
76 	src_ratio = state->last_ratio ;  in zoh_vari_process()
81 	input_index = state->last_position ;  in zoh_vari_process()
84 	while (input_index < 1.0 && priv->out_gen < priv->out_count)  in zoh_vari_process()
86 		if (priv->in_used + state->channels * input_index >= priv->in_count)  in zoh_vari_process()
89 		if (priv->out_count > 0 && fabs (state->last_ratio - data->src_ratio) > SRC_MIN_RATIO_DIFF)  in zoh_vari_process()
90 …src_ratio = state->last_ratio + priv->out_gen * (data->src_ratio - state->last_ratio) / priv->out_…  in zoh_vari_process()
92 		for (ch = 0 ; ch < state->channels ; ch++)  in zoh_vari_process()
93 		{	data->data_out [priv->out_gen] = priv->last_value [ch] ;  in zoh_vari_process()
94 			priv->out_gen ++ ;  in zoh_vari_process()
102 	priv->in_used += state->channels * lrint (input_index - rem) ;  in zoh_vari_process()
106 …while (priv->out_gen < priv->out_count && priv->in_used + state->channels * input_index <= priv->i…  in zoh_vari_process()
108 		if (priv->out_count > 0 && fabs (state->last_ratio - data->src_ratio) > SRC_MIN_RATIO_DIFF)  in zoh_vari_process()
109 …src_ratio = state->last_ratio + priv->out_gen * (data->src_ratio - state->last_ratio) / priv->out_…  in zoh_vari_process()
111 		for (ch = 0 ; ch < state->channels ; ch++)  in zoh_vari_process()
112 		{	data->data_out [priv->out_gen] = data->data_in [priv->in_used - state->channels + ch] ;  in zoh_vari_process()
113 			priv->out_gen ++ ;  in zoh_vari_process()
120 		priv->in_used += state->channels * lrint (input_index - rem) ;  in zoh_vari_process()
124 	if (priv->in_used > priv->in_count)  in zoh_vari_process()
125 	{	input_index += (priv->in_used - priv->in_count) / state->channels ;  in zoh_vari_process()
126 		priv->in_used = priv->in_count ;  in zoh_vari_process()
129 	state->last_position = input_index ;  in zoh_vari_process()
131 	if (priv->in_used > 0)  in zoh_vari_process()
132 		for (ch = 0 ; ch < state->channels ; ch++)  in zoh_vari_process()
133 			priv->last_value [ch] = data->data_in [priv->in_used - state->channels + ch] ;  in zoh_vari_process()
136 	state->last_ratio = src_ratio ;  in zoh_vari_process()
138 	data->input_frames_used = priv->in_used / state->channels ;  in zoh_vari_process()
139 	data->output_frames_gen = priv->out_gen / state->channels ;  in zoh_vari_process()
144 /*------------------------------------------------------------------------------
168 zoh_data_new (int channels)  in zoh_data_new()  argument
170 	assert (channels > 0) ;  in zoh_data_new()
175 		priv->zoh_magic_marker = ZOH_MAGIC_MARKER ;  in zoh_data_new()
176 		priv->last_value = (float *) calloc (channels, sizeof (float)) ;  in zoh_data_new()
177 		if (!priv->last_value)  in zoh_data_new()
188 zoh_state_new (int channels, SRC_ERROR *error)  in zoh_state_new()  argument
190 	assert (channels > 0) ;  in zoh_state_new()
200 	state->channels = channels ;  in zoh_state_new()
201 	state->mode = SRC_MODE_PROCESS ;  in zoh_state_new()
203 	state->private_data = zoh_data_new (state->channels) ;  in zoh_state_new()
204 	if (!state->private_data)  in zoh_state_new()
211 	state->vt = &zoh_state_vt ;  in zoh_state_new()
227 	priv = (ZOH_DATA*) state->private_data ;  in zoh_reset()
231 	priv->dirty = false ;  in zoh_reset()
232 	memset (priv->last_value, 0, sizeof (float) * state->channels) ;  in zoh_reset()
242 	if (state->private_data == NULL)  in zoh_copy()
250 	ZOH_DATA* from_priv = (ZOH_DATA*) state->private_data ;  in zoh_copy()
259 	to_priv->last_value = (float *) malloc (sizeof (float) * state->channels) ;  in zoh_copy()
260 	if (!to_priv->last_value)  in zoh_copy()
266 	memcpy (to_priv->last_value, from_priv->last_value, sizeof (float) * state->channels) ;  in zoh_copy()
268 	to->private_data = to_priv ;  in zoh_copy()
278 		ZOH_DATA *zoh = (ZOH_DATA *) state->private_data ;  in zoh_close()
281 			if (zoh->last_value)  in zoh_close()
283 				free (zoh->last_value) ;  in zoh_close()
284 				zoh->last_value = NULL ;  in zoh_close()