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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 "pcm_utils.h"
#include "playerData.h"
#include "utils.h"
#include "log.h"
#include "normalize.h"
#include "conf.h"
#include "os_compat.h"
static mpd_sint16 currentChunk = -1;
void initOutputBuffer(OutputBuffer * cb, char *chunks)
{
memset(&cb->convState, 0, sizeof(ConvState));
cb->chunks = chunks;
cb->chunkSize = (mpd_uint16 *) (((char *)cb->chunks) +
buffered_chunks * CHUNK_SIZE);
cb->bitRate = (mpd_uint16 *) (((char *)cb->chunkSize) +
buffered_chunks * sizeof(mpd_sint16));
cb->times = (float *)(((char *)cb->bitRate) +
buffered_chunks * sizeof(mpd_sint8));
}
void clearOutputBuffer(OutputBuffer * cb)
{
cb->end = cb->begin;
currentChunk = -1;
}
void flushOutputBuffer(OutputBuffer * cb)
{
if (currentChunk == cb->end) {
if (((unsigned)cb->end + 1) >= buffered_chunks) {
cb->end = 0;
}
else cb->end++;
currentChunk = -1;
}
}
int outputBufferEmpty(const OutputBuffer * cb)
{
return cb->begin == cb->end;
}
unsigned int outputBufferRelative(const OutputBuffer * cb, unsigned i)
{
if (i >= cb->begin)
return i - cb->begin;
else
return i + buffered_chunks - 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 += buffered_chunks;
i = (unsigned)cb->begin + relative;
if (i >= max)
return -1;
if (i >= buffered_chunks)
i -= buffered_chunks;
return (int)i;
}
/**
* Return the tail chunk 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;
if (currentChunk == cb->end)
return currentChunk;
next = cb->end + 1;
if (next >= buffered_chunks) {
next = 0;
}
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();
}
}
if (dc->stop)
return OUTPUT_BUFFER_DC_STOP;
currentChunk = cb->end;
cb->chunkSize[currentChunk] = 0;
cb->bitRate[currentChunk] = bitRate;
cb->times[currentChunk] = data_time;
return 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) {
int chunk_index = tailChunk(cb, inStream,
dc, seekable,
data_time, bitRate);
if (chunk_index < 0)
return chunk_index;
chunkLeft = CHUNK_SIZE - cb->chunkSize[chunk_index];
dataToSend = datalen > chunkLeft ? chunkLeft : datalen;
memcpy(cb->chunks + chunk_index * CHUNK_SIZE +
cb->chunkSize[chunk_index], data, dataToSend);
cb->chunkSize[chunk_index] += dataToSend;
datalen -= dataToSend;
data += dataToSend;
if (cb->chunkSize[chunk_index] == CHUNK_SIZE) {
flushOutputBuffer(cb);
}
}
decoder_wakeup_player();
return 0;
}
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