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92 lines
2.5 KiB
92 lines
2.5 KiB
/*****************************************************************************
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* cyclic_buffer.h cyclic buffer helper class for vlc's audio visualizations
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*****************************************************************************
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* Copyright © 2012 Vovoid Media Technologies
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*
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* Authors: Jonatan "jaw" Wallmander
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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#ifndef CYCLIC_BUFFER_H
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#define CYCLIC_BUFFER_H
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class block_holder
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{
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public:
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float data[512]; // data holder
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vlc_tick_t pts; // machine time when this is to be played
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block_holder()
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{
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pts = 0; // max_int 64-bit
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}
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};
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#define CYCLIC_BUFFER_SIZE 128
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class cyclic_block_queue
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{
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block_holder cycl_buffer[CYCLIC_BUFFER_SIZE];
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size_t consumer_pos;
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size_t insertion_pos;
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public:
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cyclic_block_queue()
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{
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consumer_pos = 0;
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insertion_pos = 0;
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}
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block_holder* consume()
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{
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vlc_tick_t cur_machine_time = vlc_tick_now();
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size_t steps = 0;
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while (
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(cycl_buffer[consumer_pos].pts < cur_machine_time)
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&&
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(steps++ < CYCLIC_BUFFER_SIZE)
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)
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{
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consumer_pos++;
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if (consumer_pos == CYCLIC_BUFFER_SIZE)
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{
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consumer_pos = 0;
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}
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}
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return &cycl_buffer[consumer_pos];
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}
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block_holder* get_insertion_object()
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{
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insertion_pos++;
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if ( insertion_pos == CYCLIC_BUFFER_SIZE )
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{
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insertion_pos = 0;
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}
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return &cycl_buffer[insertion_pos];
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}
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void reset()
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{
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for (size_t i = 0; i < CYCLIC_BUFFER_SIZE; i++)
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{
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cycl_buffer[i].pts = 0;
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consumer_pos = 0;
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insertion_pos = 0;
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}
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}
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};
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#undef CYCLIC_BUFFER_SIZE
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#endif // CYCLIC_BUFFER_H
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