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/* the Music Player Daemon (MPD)
* Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com)
* This project's homepage is: 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "outputBuffer.h"
#include "utils.h"
struct output_buffer ob;
void ob_init(unsigned int size, Notify *notify)
{
assert(size > 0);
ob.chunks = xmalloc(size * sizeof(*ob.chunks));
ob.size = size;
ob.begin = 0;
ob.end = 0;
ob.lazy = 0;
ob.notify = notify;
ob.chunks[0].chunkSize = 0;
}
void ob_free(void)
{
assert(ob.chunks != NULL);
free(ob.chunks);
}
void ob_clear(void)
{
ob.end = ob.begin;
ob.chunks[ob.end].chunkSize = 0;
}
/** return the index of the chunk after i */
static inline unsigned successor(unsigned i)
{
assert(i <= ob.size);
++i;
return i == ob.size ? 0 : i;
}
/**
* Mark the tail chunk as "full" and wake up the player if is waiting
* for the decoder.
*/
static void output_buffer_expand(unsigned i)
{
int was_empty = ob.notify != NULL && (!ob.lazy || ob_is_empty());
assert(i == (ob.end + 1) % ob.size);
assert(i != ob.end);
ob.end = i;
ob.chunks[i].chunkSize = 0;
if (was_empty)
/* if the buffer was empty, the player thread might be
waiting for us; wake it up now that another decoded
buffer has become available. */
notify_signal(ob.notify);
}
void ob_flush(void)
{
ob_chunk *chunk = ob_get_chunk(ob.end);
if (chunk->chunkSize > 0) {
unsigned int next = successor(ob.end);
if (next == ob.begin)
/* all buffers are full; we have to wait for
the player to free one, so don't flush
right now */
return;
output_buffer_expand(next);
}
}
void ob_set_lazy(int lazy)
{
ob.lazy = lazy;
}
int ob_is_empty(void)
{
return ob.begin == ob.end;
}
void ob_shift(void)
{
assert(ob.begin != ob.end);
assert(ob.begin < ob.size);
ob.begin = successor(ob.begin);
}
unsigned int ob_relative(const unsigned i)
{
if (i >= ob.begin)
return i - ob.begin;
else
return i + ob.size - ob.begin;
}
unsigned ob_available(void)
{
return ob_relative(ob.end);
}
int ob_absolute(const unsigned relative)
{
unsigned i, max;
max = ob.end;
if (max < ob.begin)
max += ob.size;
i = (unsigned)ob.begin + relative;
if (i >= max)
return -1;
if (i >= ob.size)
i -= ob.size;
return (int)i;
}
ob_chunk * ob_get_chunk(const unsigned i)
{
assert(i < ob.size);
return &ob.chunks[i];
}
/**
* Return the tail chunk which has room for additional data.
*
* @return the chunk which has room for more data; NULL if there is no
* room.
*/
static ob_chunk *tail_chunk(float data_time, mpd_uint16 bitRate)
{
unsigned int next;
ob_chunk *chunk;
chunk = ob_get_chunk(ob.end);
assert(chunk->chunkSize <= sizeof(chunk->data));
if (chunk->chunkSize == sizeof(chunk->data)) {
/* this chunk is full; allocate a new chunk */
next = successor(ob.end);
if (ob.begin == next)
/* no chunks available */
return NULL;
output_buffer_expand(next);
chunk = ob_get_chunk(next);
assert(chunk->chunkSize == 0);
}
if (chunk->chunkSize == 0) {
/* if the chunk is empty, nobody has set bitRate and
times yet */
chunk->bitRate = bitRate;
chunk->times = data_time;
}
return chunk;
}
size_t ob_append(const void *data0, size_t datalen,
float data_time, mpd_uint16 bitRate)
{
const unsigned char *data = data0;
size_t ret = 0, dataToSend;
ob_chunk *chunk = NULL;
while (datalen) {
chunk = tail_chunk(data_time, bitRate);
if (chunk == NULL)
return ret;
dataToSend = sizeof(chunk->data) - chunk->chunkSize;
if (dataToSend > datalen)
dataToSend = datalen;
memcpy(chunk->data + chunk->chunkSize, data, dataToSend);
chunk->chunkSize += dataToSend;
datalen -= dataToSend;
data += dataToSend;
ret += dataToSend;
}
if (chunk != NULL && chunk->chunkSize == sizeof(chunk->data))
ob_flush();
return ret;
}
void ob_skip(unsigned num)
{
int i = ob_absolute(num);
if (i >= 0)
ob.begin = i;
}
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