calc_output_hex calc_output_multi calc_output_quad calc_output_single calc_output_stereo coeff_t double_to_fp fp_fraction_part FP_ONE fp_to_double fp_to_int increment_t int_to_fp INV_FP_ONE MAKE_INCREMENT_T prepare_data SHIFT_BITS sinc_get_description sinc_get_name sinc_hex_vari_process SINC_MAGIC_MARKER sinc_mono_vari_process sinc_multichan_vari_process sinc_quad_vari_process sinc_reset sinc_set_converter sinc_stereo_vari_process

static int prepare_data ( SINC_FILTER *  filter, SRC_DATA *  data, int  half_filter_chan_len  ) [static] Definition at line 1135 of file src_sinc.c. Referenced by sinc_hex_vari_process(), sinc_mono_vari_process(), sinc_multichan_vari_process(), sinc_quad_vari_process(), and sinc_stereo_vari_process(). { int len = 0 ; if (filter->b_real_end >= 0) return 0 ; /* Should be terminating. Just return. */ if (filter->b_current == 0) { /* Initial state. Set up zeros at the start of the buffer and ** then load new data after that. */ len = filter->b_len - 2 * half_filter_chan_len ; filter->b_current = filter->b_end = half_filter_chan_len ; } else if (filter->b_end + half_filter_chan_len + filter->channels < filter->b_len) { /* Load data at current end position. */ len = MAX (filter->b_len - filter->b_current - half_filter_chan_len, 0) ; } else { /* Move data at end of buffer back to the start of the buffer. */ len = filter->b_end - filter->b_current ; memmove (filter->buffer, filter->buffer + filter->b_current - half_filter_chan_len, (half_filter_chan_len + len) * sizeof (filter->buffer [0])) ; filter->b_current = half_filter_chan_len ; filter->b_end = filter->b_current + len ; /* Now load data at current end of buffer. */ len = MAX (filter->b_len - filter->b_current - half_filter_chan_len, 0) ; } ; len = MIN (filter->in_count - filter->in_used, len) ; len -= (len % filter->channels) ; if (len < 0 || filter->b_end + len > filter->b_len) return SRC_ERR_SINC_PREPARE_DATA_BAD_LEN ; memcpy (filter->buffer + filter->b_end, data->data_in + filter->in_used, len * sizeof (filter->buffer [0])) ; filter->b_end += len ; filter->in_used += len ; if (filter->in_used == filter->in_count && filter->b_end - filter->b_current < 2 * half_filter_chan_len && data->end_of_input) { /* Handle the case where all data in the current buffer has been ** consumed and this is the last buffer. */ if (filter->b_len - filter->b_end < half_filter_chan_len + 5) { /* If necessary, move data down to the start of the buffer. */ len = filter->b_end - filter->b_current ; memmove (filter->buffer, filter->buffer + filter->b_current - half_filter_chan_len, (half_filter_chan_len + len) * sizeof (filter->buffer [0])) ; filter->b_current = half_filter_chan_len ; filter->b_end = filter->b_current + len ; } ; filter->b_real_end = filter->b_end ; len = half_filter_chan_len + 5 ; if (len < 0 || filter->b_end + len > filter->b_len) len = filter->b_len - filter->b_end ; memset (filter->buffer + filter->b_end, 0, len * sizeof (filter->buffer [0])) ; filter->b_end += len ; } ; return 0 ; } /* prepare_data */