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#include "remux/tsremux.h"
// from VDR's remux.c
#define MAXNONUSEFULDATA (10*1024*1024)
#define SC_PICTURE 0x00 // "picture header"
#define VIDEO_STREAM_S 0xE0
cTSRemux::cTSRemux(bool Sync) {
m_ResultCount = 0;
m_ResultDelivered = 0;
m_Synced = false;
m_Skipped = 0;
m_Sync = Sync;
}
cTSRemux::~cTSRemux(void) {
}
uchar *cTSRemux::Process(const uchar *Data, int &Count, int &Result) {
// Remove any previously delivered data from the result buffer:
if (m_ResultDelivered) {
if (m_ResultDelivered < m_ResultCount)
memmove(m_ResultBuffer, m_ResultBuffer + m_ResultDelivered, m_ResultCount
- m_ResultDelivered);
m_ResultCount -= m_ResultDelivered;
m_ResultDelivered = 0;
}
int used = 0;
// Make sure we are looking at a TS packet:
while (Count > TS_SIZE) {
if (Data[0] == 0x47 && Data[TS_SIZE] == 0x47)
break;
Data++;
Count--;
used++;
}
if (used)
esyslog("ERROR: skipped %d byte to sync on TS packet", used);
// Convert incoming TS data
for (int i = 0; i < Count; i += TS_SIZE) {
if (Count - i < TS_SIZE)
break;
if (Data[i] != 0x47)
break;
int pid = get_pid((uint8_t*)(Data + i + 1));
if (Data[i + 3] & 0x10) // got payload
PutTSPacket(pid, Data + i);
/*if (pid == m_VPid) m_VRemux->ConvertTSPacket(Data + i);
else if (pid == m_APid1) m_ARemux1->ConvertTSPacket(Data + i);
else if (pid == m_APid2 && m_ARemux2) m_ARemux2->ConvertTSPacket(Data + i);
else if (pid == m_DPid1 && m_DRemux1) m_DRemux1->ConvertTSPacket(Data + i);
else if (pid == m_DPid2 && m_DRemux2) m_DRemux2->ConvertTSPacket(Data + i);*/
used += TS_SIZE;
if (m_ResultCount > (int)sizeof(m_ResultBuffer) / 2)
break;
}
Count = used;
// When we don't need to sync, we don't need to sync :-)
if (!m_Sync) {
Result = m_ResultDelivered = m_ResultCount;
return Result ? m_ResultBuffer : NULL;
}
// Check if we're getting anywhere here:
if (!m_Synced && m_Skipped >= 0) {
if (m_Skipped > MAXNONUSEFULDATA) {
esyslog("ERROR: no useful data seen within %d byte of video stream", m_Skipped);
m_Skipped = -1;
//if (exitOnFailure)
//cThread::EmergencyExit(true);
}
else
m_Skipped += Count;
}
// Check for frame borders:
if (m_ResultCount >= MINVIDEODATA) {
for (int i = 0; i < m_ResultCount; i++) {
if (m_ResultBuffer[i] == 0 && m_ResultBuffer[i + 1] == 0 && m_ResultBuffer[i + 2] == 1) {
switch (m_ResultBuffer[i + 3]) {
case VIDEO_STREAM_S ... VIDEO_STREAM_E:
{
uchar pt = NO_PICTURE;
int l = ScanVideoPacket(m_ResultBuffer, m_ResultCount, i, pt);
if (l < 0)
return NULL; // no useful data found, wait for more
if (pt != NO_PICTURE) {
if (pt < I_FRAME || B_FRAME < pt)
esyslog("ERROR: unknown picture type '%d'", pt);
else if (!m_Synced) {
if (pt == I_FRAME) {
m_ResultDelivered = i; // will drop everything before this position
SetBrokenLink(m_ResultBuffer + i, l);
m_Synced = true;
}
else {
m_ResultDelivered = i + l; // will drop everything before and including this packet
return NULL;
}
}
}
if (m_Synced) {
Result = l;
uchar *p = m_ResultBuffer + m_ResultDelivered;
m_ResultDelivered += l;
return p;
}
else {
m_ResultDelivered = i + l; // will drop everything before and including this packet
return NULL;
}
}
break;
case PRIVATE_STREAM1:
case AUDIO_STREAM_S ... AUDIO_STREAM_E:
{
int l = GetPacketLength(m_ResultBuffer, m_ResultCount, i);
if (l < 0)
return NULL; // no useful data found, wait for more
if (m_Synced) {
Result = l;
uchar *p = m_ResultBuffer + m_ResultDelivered;
m_ResultDelivered += l;
return p;
}
else {
m_ResultDelivered = i + l; // will drop everything before and including this packet
return NULL;
}
}
break;
}
}
}
}
return NULL; // no useful data found, wait for more
}
int cTSRemux::ScanVideoPacket(const uchar *Data, int Count, int Offset, uchar &PictureType) {
// Scans the video packet starting at Offset and returns its length.
// If the return value is -1 the packet was not completely in the buffer.
int Length = GetPacketLength(Data, Count, Offset);
if (Length > 0 && Offset + Length <= Count) {
int i = Offset + 8; // the minimum length of the video packet header
i += Data[i] + 1; // possible additional header bytes
for (; i < Offset + Length; i++) {
if (Data[i] == 0 && Data[i + 1] == 0 && Data[i + 2] == 1) {
switch (Data[i + 3]) {
case SC_PICTURE: PictureType = (Data[i + 5] >> 3) & 0x07;
return Length;
}
}
}
PictureType = NO_PICTURE;
return Length;
}
return -1;
}
int cTSRemux::GetPacketLength(const uchar *Data, int Count, int Offset) {
// Returns the entire length of the packet starting at offset, or -1 in case of error.
return (Offset + 5 < Count) ? (Data[Offset + 4] << 8) + Data[Offset + 5] + 6 : -1;
}
void cTSRemux::SetBrokenLink(uchar *Data, int Length) {
if (Length > 9 && Data[0] == 0 && Data[1] == 0 && Data[2] == 1 && (Data[3] & VIDEO_STREAM_S) == VIDEO_STREAM_S) {
for (int i = Data[8] + 9; i < Length - 7; i++) { // +9 to skip video packet header
if (Data[i] == 0 && Data[i + 1] == 0 && Data[i + 2] == 1 && Data[i + 3] == 0xB8) {
if (!(Data[i + 7] & 0x40)) // set flag only if GOP is not closed
Data[i + 7] |= 0x20;
return;
}
}
dsyslog("SetBrokenLink: no GOP header found in video packet");
}
else
dsyslog("SetBrokenLink: no video packet in frame");
}
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