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/*
* Copyright (C) 2005-2012 Team XBMC
* http://www.xbmc.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, 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 XBMC; see the file COPYING. If not, see
* <http://www.gnu.org/licenses/>.
*
*/
#include "CDDAcodec.h"
#if !defined(TARGET_DARWIN_IOS)
#include <cdio/sector.h>
#else
typedef int32_t lsn_t;
#define CDIO_CD_FRAMESIZE_RAW 2352
#define CDIO_CD_FRAMES_PER_SEC 75
#endif
#include "cores/AudioEngine/Utils/AEUtil.h"
#define SECTOR_COUNT 55 // max. sectors that can be read at once
#define MAX_BUFFER_SIZE 2*SECTOR_COUNT*CDIO_CD_FRAMESIZE_RAW
CDDACodec::CDDACodec()
{
m_SampleRate = 44100;
m_Channels = 2;
m_BitsPerSample = 16;
m_DataFormat = AE_FMT_S16NE;
m_TotalTime = 0;
m_Bitrate = 0;
m_CodecName = "CDDA";
m_BufferSize=0;
m_Buffer = new BYTE[MAX_BUFFER_SIZE];
m_BufferPos = 0;
}
CDDACodec::~CDDACodec()
{
DeInit();
if (m_Buffer)
{
delete[] m_Buffer;
m_Buffer = NULL;
}
}
bool CDDACodec::Init(const CStdString &strFile, unsigned int filecache)
{
if (!m_file.Open(strFile, READ_CACHED))
return false;
// Calculate total time of the track
m_TotalTime=(m_file.GetLength()/CDIO_CD_FRAMESIZE_RAW)/CDIO_CD_FRAMES_PER_SEC;
if (m_TotalTime > 0)
m_Bitrate = (int)((m_file.GetLength() * 8) / m_TotalTime);
else
m_Bitrate = 0;
m_TotalTime*=1000; // ms
return true;
}
void CDDACodec::DeInit()
{
m_file.Close();
}
int64_t CDDACodec::Seek(int64_t iSeekTime)
{
// Calculate the next full second...
int iSeekTimeFullSec=(int)(iSeekTime+(1000-(iSeekTime%1000)))/1000;
// ...and the logical sector on the cd...
lsn_t lsnSeek=iSeekTimeFullSec*CDIO_CD_FRAMES_PER_SEC;
// ... then seek to its position...
int iNewOffset=(int)m_file.Seek(lsnSeek*CDIO_CD_FRAMESIZE_RAW, SEEK_SET);
m_BufferSize=m_BufferPos=0;
// ... and look if we really got there.
int iNewSeekTime=(iNewOffset/CDIO_CD_FRAMESIZE_RAW)/CDIO_CD_FRAMES_PER_SEC;
return iNewSeekTime*(int64_t)1000; // ms
}
int CDDACodec::ReadPCM(BYTE *pBuffer, int size, int *actualsize)
{
*actualsize=0;
bool bEof=false;
// Reached end of track?
if (m_file.GetLength()==m_file.GetPosition())
bEof=true;
// Do we have to refill our audio buffer?
if (m_BufferSize-m_BufferPos<MAX_BUFFER_SIZE/2 && !bEof)
{
// Move the remaining audio data to the beginning of the buffer
memmove(m_Buffer, m_Buffer + m_BufferPos, m_BufferSize-m_BufferPos);
m_BufferSize=m_BufferSize-m_BufferPos;
m_BufferPos = 0;
// Fill our buffer with a chunk of audio data
int iAmountRead=m_file.Read(m_Buffer+m_BufferSize, MAX_BUFFER_SIZE/2);
if (iAmountRead<=0)
return READ_ERROR;
m_BufferSize+=iAmountRead;
}
// Our buffer is empty and no data left to read from the cd
if (m_BufferSize-m_BufferPos==0 && bEof)
return READ_EOF;
// Try to give the player the amount of audio data he wants
if (m_BufferSize-m_BufferPos>=size)
{ // we have enough data in our buffer
memcpy(pBuffer, m_Buffer + m_BufferPos, size);
m_BufferPos+=size;
*actualsize=size;
}
else
{ // Only a smaller amount of data left as the player wants
memcpy(pBuffer, m_Buffer + m_BufferPos, m_BufferSize-m_BufferPos);
*actualsize=m_BufferSize-m_BufferPos;
m_BufferPos+=m_BufferSize-m_BufferPos;
}
return READ_SUCCESS;
}
bool CDDACodec::CanInit()
{
return true;
}
CAEChannelInfo CDDACodec::GetChannelInfo()
{
static enum AEChannel map[2][3] = {
{AE_CH_FC, AE_CH_NULL},
{AE_CH_FL, AE_CH_FR , AE_CH_NULL}
};
if (m_Channels > 2)
return CAEUtil::GuessChLayout(m_Channels);
return CAEChannelInfo(map[m_Channels - 1]);
}
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