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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"
#include "normalize.h"
void initOutputBuffer(OutputBuffer * cb, unsigned int size)
{
assert(size > 0);
memset(&cb->convState, 0, sizeof(ConvState));
cb->chunks = xmalloc(size * sizeof(*cb->chunks));
cb->size = size;
cb->currentChunk = -1;
}
void output_buffer_free(OutputBuffer * cb)
{
assert(cb->chunks != NULL);
free(cb->chunks);
}
void clearOutputBuffer(OutputBuffer * cb)
{
cb->end = cb->begin;
cb->currentChunk = -1;
}
/** return the index of the chunk after i */
static inline unsigned successor(const OutputBuffer * cb, unsigned i)
{
assert(i <= cb->size);
++i;
return i == cb->size ? 0 : i;
}
void flushOutputBuffer(OutputBuffer * cb)
{
if (cb->currentChunk == (int)cb->end) {
int was_empty = outputBufferEmpty(cb);
cb->end = successor(cb, cb->end);
cb->currentChunk = -1;
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. */
decoder_wakeup_player();
}
}
int outputBufferEmpty(const OutputBuffer * cb)
{
return cb->begin == cb->end;
}
void outputBufferShift(OutputBuffer * cb)
{
assert(cb->begin != cb->end);
assert(cb->begin < cb->size);
cb->begin = successor(cb, cb->begin);
}
unsigned int outputBufferRelative(const OutputBuffer * cb, unsigned i)
{
if (i >= cb->begin)
return i - cb->begin;
else
return i + cb->size - cb->begin;
}
unsigned availableOutputBuffer(const OutputBuffer * cb)
{
return outputBufferRelative(cb, cb->end);
}
int outputBufferAbsolute(const OutputBuffer * cb, unsigned relative)
{
unsigned i, max;
max = cb->end;
if (max < cb->begin)
max += cb->size;
i = (unsigned)cb->begin + relative;
if (i >= max)
return -1;
if (i >= cb->size)
i -= cb->size;
return (int)i;
}
OutputBufferChunk * outputBufferGetChunk(const OutputBuffer * cb, unsigned i)
{
assert(i < cb->size);
return &cb->chunks[i];
}
/**
* Return the tail chunk which has room for additional data. If there
* is no room in the queue, this function blocks until the player
* thread has finished playing its current chunk.
*
* @return the positive index of the new chunk; OUTPUT_BUFFER_DC_SEEK
* if another thread requested seeking; OUTPUT_BUFFER_DC_STOP if
* another thread requested stopping the decoder.
*/
static int tailChunk(OutputBuffer * cb, InputStream * inStream,
DecoderControl * dc, int seekable,
float data_time, mpd_uint16 bitRate)
{
unsigned int next;
OutputBufferChunk *chunk;
if (cb->currentChunk == (int)cb->end)
return cb->currentChunk;
next = successor(cb, cb->end);
while (cb->begin == next && !dc->stop) {
if (dc->seek) {
if (seekable) {
return OUTPUT_BUFFER_DC_SEEK;
} else {
dc->seekError = 1;
dc->seek = 0;
decoder_wakeup_player();
}
}
if (!inStream ||
bufferInputStream(inStream) <= 0) {
decoder_sleep(dc);
}
}
if (dc->stop)
return OUTPUT_BUFFER_DC_STOP;
cb->currentChunk = cb->end;
chunk = outputBufferGetChunk(cb, cb->currentChunk);
chunk->chunkSize = 0;
chunk->bitRate = bitRate;
chunk->times = data_time;
return cb->currentChunk;
}
int sendDataToOutputBuffer(OutputBuffer * cb, InputStream * inStream,
DecoderControl * dc, int seekable, void *dataIn,
size_t dataInLen, float data_time, mpd_uint16 bitRate,
ReplayGainInfo * replayGainInfo)
{
mpd_uint16 dataToSend;
mpd_uint16 chunkLeft;
char *data;
size_t datalen;
static char *convBuffer;
static size_t convBufferLen;
if (cmpAudioFormat(&(cb->audioFormat), &(dc->audioFormat)) == 0) {
data = dataIn;
datalen = dataInLen;
} else {
datalen = pcm_sizeOfConvBuffer(&(dc->audioFormat), dataInLen,
&(cb->audioFormat));
if (datalen > convBufferLen) {
if (convBuffer != NULL)
free(convBuffer);
convBuffer = xmalloc(datalen);
convBufferLen = datalen;
}
data = convBuffer;
datalen = pcm_convertAudioFormat(&(dc->audioFormat), dataIn,
dataInLen, &(cb->audioFormat),
data, &(cb->convState));
}
if (replayGainInfo && (replayGainState != REPLAYGAIN_OFF))
doReplayGain(replayGainInfo, data, datalen, &cb->audioFormat);
else if (normalizationEnabled)
normalizeData(data, datalen, &cb->audioFormat);
while (datalen) {
OutputBufferChunk *chunk;
int chunk_index = tailChunk(cb, inStream,
dc, seekable,
data_time, bitRate);
if (chunk_index < 0)
return chunk_index;
chunk = outputBufferGetChunk(cb, chunk_index);
chunkLeft = sizeof(chunk->data) - chunk->chunkSize;
dataToSend = datalen > chunkLeft ? chunkLeft : datalen;
memcpy(chunk->data + chunk->chunkSize, data, dataToSend);
chunk->chunkSize += dataToSend;
datalen -= dataToSend;
data += dataToSend;
if (chunk->chunkSize == sizeof(chunk->data)) {
flushOutputBuffer(cb);
}
}
return 0;
}
void output_buffer_skip(OutputBuffer * cb, unsigned num)
{
int i = outputBufferAbsolute(cb, num);
if (i >= 0)
cb->begin = i;
}
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