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/*
* vdr-plugin-vnsi - KODI server plugin for VDR
*
* Copyright (C) 2005-2012 Team XBMC
* Copyright (C) 2015 Team KODI
*
* http://kodi.tv
*
* 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 KODI; see the file COPYING. If not, see
* <http://www.gnu.org/licenses/>.
*
*/
#include "parser_MPEGAudio.h"
#include "bitstream.h"
#include "config.h"
#include <stdlib.h>
#include <assert.h>
#define MAX_RDS_BUFFER_SIZE 100000
const uint16_t FrequencyTable[3] = { 44100, 48000, 32000 };
const uint16_t BitrateTable[2][3][15] =
{
{
{0, 32, 64, 96, 128, 160, 192, 224, 256, 288, 320, 352, 384, 416, 448 },
{0, 32, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 384 },
{0, 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320 }
},
{
{0, 32, 48, 56, 64, 80, 96, 112, 128, 144, 160, 176, 192, 224, 256},
{0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160},
{0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160}
}
};
cParserMPEG2Audio::cParserMPEG2Audio(int pID, cTSStream *stream, sPtsWrap *ptsWrap, bool observePtsWraps, bool enableRDS)
: cParser(pID, stream, ptsWrap, observePtsWraps)
{
m_PTS = 0;
m_DTS = 0;
m_FrameSize = 0;
m_SampleRate = 0;
m_Channels = 0;
m_BitRate = 0;
m_PesBufferInitialSize = 2048;
m_RDSEnabled = enableRDS;
m_RDSBufferInitialSize = 384;
m_RDSBuffer = NULL;
m_RDSBufferSize = 0;
m_RDSExtPID = 0;
}
cParserMPEG2Audio::~cParserMPEG2Audio()
{
free(m_RDSBuffer);
}
void cParserMPEG2Audio::Parse(sStreamPacket *pkt, sStreamPacket *pkt_side_data)
{
int p = m_PesParserPtr;
int l;
while ((l = m_PesBufferPtr - p) > 3)
{
if (FindHeaders(m_PesBuffer + p, l) < 0)
break;
p++;
}
m_PesParserPtr = p;
if (m_FoundFrame && l >= m_FrameSize)
{
bool streamChange = m_Stream->SetAudioInformation(m_Channels, m_SampleRate, m_BitRate, 0, 0);
pkt->id = m_pID;
pkt->data = &m_PesBuffer[p];
pkt->size = m_FrameSize;
pkt->duration = 90000 * 1152 / m_SampleRate;
pkt->dts = m_DTS;
pkt->pts = m_PTS;
pkt->streamChange = streamChange;
m_PesNextFramePtr = p + m_FrameSize;
m_PesParserPtr = 0;
m_FoundFrame = false;
if (m_RDSEnabled)
{
/*
* Reading of RDS Universal Encoder Communication Protocol
* If present it starts on end of a mpeg audio stream and goes
* backwards.
* See ETSI TS 101 154 - C.4.2.18 for details.
*/
int rdsl = m_PesBuffer[p+m_FrameSize-2]; // RDS DataFieldLength
if (m_PesBuffer[p+m_FrameSize-1] == 0xfd && rdsl > 0) // RDS DataSync = 0xfd @ end
{
if (m_RDSBuffer == NULL)
{
m_RDSBufferSize = m_RDSBufferInitialSize;
m_RDSBuffer = (uint8_t*)malloc(m_RDSBufferSize);
if (m_RDSBuffer == NULL)
{
ERRORLOG("PVR Parser MPEG2-Audio - %s - malloc failed for RDS data", __FUNCTION__);
m_RDSEnabled = false;
return;
}
m_RDSExtPID = m_Stream->AddSideDataType(scRDS);
if (!m_RDSExtPID)
{
ERRORLOG("PVR Parser MPEG2-Audio - %s - failed to add RDS data stream", __FUNCTION__);
m_RDSEnabled = false;
return;
}
}
if (rdsl >= m_RDSBufferSize)
{
if (rdsl >= MAX_RDS_BUFFER_SIZE)
{
ERRORLOG("PVR Parser MPEG2-Audio - %s - max buffer size (%i kB) for RDS data reached, pid: %d", __FUNCTION__, MAX_RDS_BUFFER_SIZE/1024, m_pID);
m_RDSEnabled = false;
return;
}
m_RDSBufferSize += m_RDSBufferInitialSize / 10;
uint8_t *new_buffer = (uint8_t *)realloc(m_RDSBuffer, m_RDSBufferSize);
if (new_buffer == NULL)
{
ERRORLOG("PVR Parser MPEG2-Audio - %s - realloc for RDS data failed", __FUNCTION__);
m_RDSEnabled = false;
return;
}
m_RDSBuffer = new_buffer;
}
int pes_buffer_ptr = 0;
for (int i = m_FrameSize-3; i > m_FrameSize-3-rdsl; i--) // <-- data reverse, from end to start
m_RDSBuffer[pes_buffer_ptr++] = m_PesBuffer[p+i];
pkt_side_data->id = m_RDSExtPID;
pkt_side_data->data = m_RDSBuffer;
pkt_side_data->size = pes_buffer_ptr;
pkt_side_data->duration = 0;
pkt_side_data->dts = m_curDTS;
pkt_side_data->pts = m_curPTS;
pkt_side_data->streamChange = false;
}
}
}
}
int cParserMPEG2Audio::FindHeaders(uint8_t *buf, int buf_size)
{
if (m_FoundFrame)
return -1;
if (buf_size < 4)
return -1;
uint8_t *buf_ptr = buf;
if ((buf_ptr[0] == 0xFF && (buf_ptr[1] & 0xE0) == 0xE0))
{
cBitstream bs(buf_ptr, 4 * 8);
bs.skipBits(11); // syncword
int audioVersion = bs.readBits(2);
if (audioVersion == 1)
return 0;
int mpeg2 = !(audioVersion & 1);
int mpeg25 = !(audioVersion & 3);
int layer = bs.readBits(2);
if (layer == 0)
return 0;
layer = 4 - layer;
bs.skipBits(1); // protetion bit
int bitrate_index = bs.readBits(4);
if (bitrate_index == 15 || bitrate_index == 0)
return 0;
m_BitRate = BitrateTable[mpeg2][layer - 1][bitrate_index] * 1000;
int sample_rate_index = bs.readBits(2);
if (sample_rate_index == 3)
return 0;
m_SampleRate = FrequencyTable[sample_rate_index] >> (mpeg2 + mpeg25);
int padding = bs.readBits1();
bs.skipBits(1); // private bit
int channel_mode = bs.readBits(2);
if (channel_mode == 11)
m_Channels = 1;
else
m_Channels = 2;
if (layer == 1)
m_FrameSize = (12 * m_BitRate / m_SampleRate + padding) * 4;
else
m_FrameSize = 144 * m_BitRate / m_SampleRate + padding;
m_FoundFrame = true;
m_DTS = m_curPTS;
m_PTS = m_curPTS;
m_curPTS += 90000 * 1152 / m_SampleRate;
return -1;
}
return 0;
}
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