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demuxer_MPEGVideo.c
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demuxer_MPEGVideo.c
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/*
* vdr-plugin-xvdr - XBMC server plugin for VDR
*
* Copyright (C) 2010 Alwin Esch (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, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
* http://www.gnu.org/copyleft/gpl.html
*
*/
#include <stdlib.h>
#include <assert.h>
#include "config/config.h"
#include "live/livestreamer.h"
#include "bitstream.h"
#include "demuxer_MPEGVideo.h"
using namespace std;
#define MPEG_PICTURE_START 0x00000100
#define MPEG_SEQUENCE_START 0x000001b3
#define MPEG_SEQUENCE_EXTENSION 0x000001b5
#define MPEG_SLICE_S 0x00000101
#define MPEG_SLICE_E 0x000001af
/**
* MPEG2VIDEO frame duration table (in 90kHz clock domain)
*/
const unsigned int mpeg2video_framedurations[16] = {
0,
3753,
3750,
3600,
3003,
3000,
1800,
1501,
1500,
};
cParserMPEG2Video::cParserMPEG2Video(cTSDemuxer *demuxer, cLiveStreamer *streamer, int streamIndex)
: cParser(streamer, streamIndex)
{
m_pictureBuffer = NULL;
m_pictureBufferSize = 0;
m_pictureBufferPtr = 0;
m_StartCond = 0;
m_StartCode = 0;
m_StartCodeOffset = 0;
m_FrameDuration = 0;
m_vbvDelay = -1;
m_vbvSize = 0;
m_Height = 0;
m_Width = 0;
m_StreamPacket = NULL;
m_demuxer = demuxer;
}
cParserMPEG2Video::~cParserMPEG2Video()
{
while (!m_PTSQueue.empty())
{
sStreamPacket* pkt = m_PTSQueue.front();
m_PTSQueue.pop_front();
free(pkt->data);
delete pkt;
}
while (!m_DurationQueue.empty())
{
sStreamPacket* pkt = m_DurationQueue.front();
m_DurationQueue.pop_front();
free(pkt->data);
delete pkt;
}
if (m_pictureBuffer)
{
free(m_pictureBuffer);
m_pictureBuffer = NULL;
}
}
void cParserMPEG2Video::Parse(unsigned char *data, int size, bool pusi)
{
uint32_t startcode = m_StartCond;
/* Parse PES header here for MPEG PS streams like from pvrinput */
if (pusi && m_Streamer->IsMPEGPS())
{
int hlen;
hlen = ParsePESHeader(data, size);
#if 0
int i;
for(i = 0; i < 16; i++)
printf("%02x.", data[i]);
printf(" %d\n", hlen);
#endif
data += hlen;
size -= hlen;
if(size < 1)
return;
}
if (m_pictureBuffer == NULL)
{
m_pictureBufferSize = 4000;
m_pictureBuffer = (uint8_t*)malloc(m_pictureBufferSize);
}
if (m_pictureBufferPtr + size + 4 >= m_pictureBufferSize)
{
m_pictureBufferSize += size * 4;
m_pictureBuffer = (uint8_t*)realloc(m_pictureBuffer, m_pictureBufferSize);
}
for (int i = 0; i < size; i++)
{
if (!m_pictureBuffer)
break;
m_pictureBuffer[m_pictureBufferPtr++] = data[i];
startcode = startcode << 8 | data[i];
if ((startcode & 0xffffff00) != 0x00000100)
continue;
bool reset = true;
if (m_pictureBufferPtr - 4 > 0 && m_StartCode != 0)
{
reset = Parse_MPEG2Video(m_pictureBufferPtr - 4, startcode, m_StartCodeOffset);
}
if (reset)
{
/* Reset packet parser upon length error or if parser tells us so */
m_pictureBufferPtr = 0;
m_pictureBuffer[m_pictureBufferPtr++] = startcode >> 24;
m_pictureBuffer[m_pictureBufferPtr++] = startcode >> 16;
m_pictureBuffer[m_pictureBufferPtr++] = startcode >> 8;
m_pictureBuffer[m_pictureBufferPtr++] = startcode >> 0;
}
m_StartCode = startcode;
m_StartCodeOffset = m_pictureBufferPtr - 4;
}
m_StartCond = startcode;
}
bool cParserMPEG2Video::Parse_MPEG2Video(size_t len, uint32_t next_startcode, int sc_offset)
{
int frametype;
uint8_t *buf = m_pictureBuffer + sc_offset;
cBitstream bs(buf + 4, (len - 4) * 8);
switch (m_StartCode)
{
case 0x000001e0 ... 0x000001ef:
/* System start codes for video */
if (len >= 9)
ParsePESHeader(buf, len);
return true;
case 0x00000100:
/* Picture start code */
if (m_FrameDuration == 0 || m_curDTS == DVD_NOPTS_VALUE)
return true;
if (Parse_MPEG2Video_PicStart(&frametype, &bs))
return true;
if (m_StreamPacket != NULL)
{
ERRORLOG("MPEG2 Video got a new picture start code with already openend steam packed");
}
m_StreamPacket = new sStreamPacket;
m_StreamPacket->id = m_streamIndex;
m_StreamPacket->pts = m_curPTS;
m_StreamPacket->dts = m_curDTS;
m_StreamPacket->frametype = frametype;
m_StreamPacket->duration = 0;
m_FoundFrame = true;
break;
case 0x000001b3:
/* Sequence start code */
if (Parse_MPEG2Video_SeqStart(&bs))
return true;
break;
case 0x000001b5:
if(len < 5)
return true;
switch(buf[4] >> 4) {
case 0x1:
/* sequence extension */
// printf("Sequence extension, len = %d\n", len);
if(len < 10)
return true;
// printf("Profile = %d\n", buf[4] & 0x7);
// printf(" Level = %d\n", buf[5] >> 4);
break;
}
break;
case 0x00000101 ... 0x000001af:
/* Slices */
if (next_startcode == 0x100 || next_startcode > 0x1af)
{
/* Last picture slice (because next not a slice) */
if(m_StreamPacket == NULL)
{
/* no packet, may've been discarded by sanity checks here */
return true;
}
m_StreamPacket->data = m_pictureBuffer;
m_StreamPacket->size = m_pictureBufferPtr - 4;
m_StreamPacket->duration = m_FrameDuration;
Parse_ComputePTS(m_StreamPacket);
m_StreamPacket = NULL;
m_pictureBuffer = (uint8_t*)malloc(m_pictureBufferSize);
/* If we know the frame duration, increase DTS accordingly */
m_curDTS += m_FrameDuration;
/* PTS cannot be extrapolated (it's not linear) */
m_curPTS = DVD_NOPTS_VALUE;
return true;
}
break;
default:
break;
}
return false;
}
bool cParserMPEG2Video::Parse_MPEG2Video_SeqStart(cBitstream *bs)
{
if (bs->length() < 61)
return true;
m_Width = bs->readBits(12);
m_Height = bs->readBits(12);
// figure out Display Aspect Ratio
double DAR = 0;
uint8_t aspect = bs->readBits(4);
switch(aspect)
{
case 0:
default:
ERRORLOG("invalid / forbidden DAR in sequence header !");
break;
case 1:
DAR = 1.0;
break;
case 2:
DAR = 4.0/3.0;
break;
case 3:
DAR = 16.0/9.0;
break;
case 4:
DAR = 2.21;
break;
}
m_FrameDuration = mpeg2video_framedurations[bs->readBits(4)];
bs->skipBits(18);
bs->skipBits(1);
if (m_Width > 0)
m_Streamer->SetReady();
m_vbvSize = bs->readBits(10) * 16 * 1024 / 8;
m_demuxer->SetVideoInformation(0,0, m_Height, m_Width, DAR, 1, 1);
return false;
}
bool cParserMPEG2Video::Parse_MPEG2Video_PicStart(int *frametype, cBitstream *bs)
{
if (bs->length() < 29)
return true;
bs->skipBits(10); /* temporal reference */
int pct = bs->readBits(3);
if (pct < PKT_I_FRAME || pct > PKT_B_FRAME)
return true; /* Illegal picture_coding_type */
*frametype = pct;
int vbvDelay = bs->readBits(16); /* vbv_delay */
if (vbvDelay == 0xffff)
m_vbvDelay = -1;
else
m_vbvDelay = Rescale(vbvDelay);
return false;
}
void cParserMPEG2Video::Parse_ComputePTS(sStreamPacket *pkt)
{
bool validpts = pkt->pts != DVD_NOPTS_VALUE && m_PTSQueue.size() == 0;
/* PTS known and no other packets in queue, deliver at once */
if (validpts && pkt->duration)
{
if (m_Width > 0)
SendPacket(pkt);
free(pkt->data);
delete pkt;
return;
}
if (validpts)
return Parse_ComputeDuration(pkt);
m_PTSQueue.push_back(pkt);
while (!m_PTSQueue.empty())
{
pkt = m_PTSQueue.front();
switch (pkt->frametype)
{
case PKT_B_FRAME:
/* B-frames have same PTS as DTS, pass them on */
pkt->pts = pkt->dts;
break;
case PKT_I_FRAME:
case PKT_P_FRAME:
/* Presentation occures at DTS of next I or P frame, try to find it */
deque<sStreamPacket*>::iterator it;
it = m_PTSQueue.begin()+1;
while (1)
{
if (it >= m_PTSQueue.end())
return; /* not arrived yet, wait */
sStreamPacket* pkt2 = *it++;
if (pkt2->frametype <= PKT_P_FRAME)
{
pkt->pts = pkt2->dts;
break;
}
}
break;
}
m_PTSQueue.pop_front();
if (pkt->duration == 0)
{
Parse_ComputeDuration(pkt);
}
else
{
if (m_Width > 0)
SendPacket(pkt);
free(pkt->data);
delete pkt;
}
}
}
void cParserMPEG2Video::Parse_ComputeDuration(sStreamPacket *pkt)
{
m_DurationQueue.push_back(pkt);
pkt = m_DurationQueue.front();
if (m_DurationQueue.size() <= 1)
return;
sStreamPacket *next = m_DurationQueue[1];
int64_t duration = next->dts - pkt->dts;
m_DurationQueue.pop_front();
if (duration >= 10)
{
pkt->duration = duration;
if (m_Width > 0)
SendPacket(pkt);
}
free(pkt->data);
}