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/*
* Copyright (C) 2003-2013 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "PeakBuffer.hxx"
#include "HugeAllocator.hxx"
#include "fifo_buffer.h"
#include <algorithm>
#include <assert.h>
#include <stdint.h>
#include <string.h>
PeakBuffer::~PeakBuffer()
{
if (normal_buffer != nullptr)
fifo_buffer_free(normal_buffer);
if (peak_buffer != nullptr)
HugeFree(peak_buffer, peak_size);
}
bool
PeakBuffer::IsEmpty() const
{
return (normal_buffer == nullptr ||
fifo_buffer_is_empty(normal_buffer)) &&
(peak_buffer == nullptr ||
fifo_buffer_is_empty(peak_buffer));
}
ConstBuffer<void>
PeakBuffer::Read() const
{
if (normal_buffer != nullptr) {
size_t size;
const void *p = fifo_buffer_read(normal_buffer, &size);
if (p != nullptr)
return { p, size };
}
if (peak_buffer != nullptr) {
size_t size;
const void *p = fifo_buffer_read(peak_buffer, &size);
if (p != nullptr)
return { p, size };
}
return nullptr;
}
void
PeakBuffer::Consume(size_t length)
{
if (normal_buffer != nullptr && !fifo_buffer_is_empty(normal_buffer)) {
fifo_buffer_consume(normal_buffer, length);
return;
}
if (peak_buffer != nullptr && !fifo_buffer_is_empty(peak_buffer)) {
fifo_buffer_consume(peak_buffer, length);
if (fifo_buffer_is_empty(peak_buffer)) {
HugeFree(peak_buffer, peak_size);
peak_buffer = nullptr;
}
return;
}
}
static size_t
AppendTo(fifo_buffer *buffer, const void *data, size_t length)
{
assert(data != nullptr);
assert(length > 0);
size_t total = 0;
do {
size_t max_length;
void *p = fifo_buffer_write(buffer, &max_length);
if (p == nullptr)
break;
const size_t nbytes = std::min(length, max_length);
memcpy(p, data, nbytes);
fifo_buffer_append(buffer, nbytes);
data = (const uint8_t *)data + nbytes;
length -= nbytes;
total += nbytes;
} while (length > 0);
return total;
}
bool
PeakBuffer::Append(const void *data, size_t length)
{
if (length == 0)
return true;
if (peak_buffer != nullptr && !fifo_buffer_is_empty(peak_buffer)) {
size_t nbytes = AppendTo(peak_buffer, data, length);
return nbytes == length;
}
if (normal_buffer == nullptr)
normal_buffer = fifo_buffer_new(normal_size);
size_t nbytes = AppendTo(normal_buffer, data, length);
if (nbytes > 0) {
data = (const uint8_t *)data + nbytes;
length -= nbytes;
if (length == 0)
return true;
}
if (peak_buffer == nullptr && peak_size > 0) {
peak_buffer = (fifo_buffer *)HugeAllocate(peak_size);
if (peak_buffer == nullptr)
return false;
fifo_buffer_init(peak_buffer, peak_size);
}
nbytes = AppendTo(peak_buffer, data, length);
return nbytes == length;
}
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