144 lines
3.3 KiB
C++
144 lines
3.3 KiB
C++
/*
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* Copyright (C) 2003-2013 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "PeakBuffer.hxx"
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#include "HugeAllocator.hxx"
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#include "fifo_buffer.h"
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#include <algorithm>
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#include <assert.h>
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#include <stdint.h>
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#include <string.h>
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PeakBuffer::~PeakBuffer()
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{
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if (normal_buffer != nullptr)
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fifo_buffer_free(normal_buffer);
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if (peak_buffer != nullptr)
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HugeFree(peak_buffer, peak_size);
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}
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bool
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PeakBuffer::IsEmpty() const
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{
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return (normal_buffer == nullptr ||
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fifo_buffer_is_empty(normal_buffer)) &&
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(peak_buffer == nullptr ||
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fifo_buffer_is_empty(peak_buffer));
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}
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const void *
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PeakBuffer::Read(size_t *length_r) const
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{
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if (normal_buffer != nullptr) {
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const void *p = fifo_buffer_read(normal_buffer, length_r);
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if (p != nullptr)
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return p;
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}
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if (peak_buffer != nullptr) {
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const void *p = fifo_buffer_read(peak_buffer, length_r);
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if (p != nullptr)
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return p;
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}
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return nullptr;
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}
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void
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PeakBuffer::Consume(size_t length)
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{
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if (normal_buffer != nullptr && !fifo_buffer_is_empty(normal_buffer)) {
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fifo_buffer_consume(normal_buffer, length);
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return;
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}
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if (peak_buffer != nullptr && !fifo_buffer_is_empty(peak_buffer)) {
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fifo_buffer_consume(peak_buffer, length);
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if (fifo_buffer_is_empty(peak_buffer)) {
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HugeFree(peak_buffer, peak_size);
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peak_buffer = nullptr;
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}
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return;
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}
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}
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static size_t
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AppendTo(fifo_buffer *buffer, const void *data, size_t length)
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{
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assert(data != nullptr);
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assert(length > 0);
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size_t total = 0;
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do {
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size_t max_length;
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void *p = fifo_buffer_write(buffer, &max_length);
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if (p == nullptr)
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break;
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const size_t nbytes = std::min(length, max_length);
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memcpy(p, data, nbytes);
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fifo_buffer_append(buffer, nbytes);
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data = (const uint8_t *)data + nbytes;
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length -= nbytes;
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total += nbytes;
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} while (length > 0);
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return total;
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}
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bool
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PeakBuffer::Append(const void *data, size_t length)
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{
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if (length == 0)
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return true;
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if (peak_buffer != nullptr && !fifo_buffer_is_empty(peak_buffer)) {
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size_t nbytes = AppendTo(peak_buffer, data, length);
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return nbytes == length;
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}
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if (normal_buffer == nullptr)
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normal_buffer = fifo_buffer_new(normal_size);
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size_t nbytes = AppendTo(normal_buffer, data, length);
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if (nbytes > 0) {
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data = (const uint8_t *)data + nbytes;
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length -= nbytes;
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if (length == 0)
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return true;
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}
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if (peak_buffer == nullptr && peak_size > 0) {
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peak_buffer = (fifo_buffer *)HugeAllocate(peak_size);
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if (peak_buffer == nullptr)
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return false;
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fifo_buffer_init(peak_buffer, peak_size);
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}
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nbytes = AppendTo(peak_buffer, data, length);
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return nbytes == length;
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}
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