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Speeded up cVideoRepacker
This commit is contained in:
Klaus Schmidinger
parent
5cd7945ab5
commit
f0741c95c0
1
HISTORY
1
HISTORY
@ -4280,3 +4280,4 @@ Video Disk Recorder Revision History
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Huelswitt).
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- Fixed handling "pending" timers that blocked others that actually could record
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(reported by Thomas Koch).
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- Speeded up cVideoRepacker (thanks to Reinhard Nissl).
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347
remux.c
347
remux.c
@ -11,7 +11,7 @@
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* The cRepacker family's code was originally written by Reinhard Nissl <rnissl@gmx.de>,
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* and adapted to the VDR coding style by Klaus.Schmidinger@cadsoft.de.
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*
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* $Id: remux.c 1.53 2006/01/08 11:40:16 kls Exp $
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* $Id: remux.c 1.54 2006/02/03 16:19:02 kls Exp $
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*/
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#include "remux.h"
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@ -248,6 +248,14 @@ private:
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scanPicture
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};
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int state;
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void HandleStartCode(const uchar *const Data, cRingBufferLinear *const ResultBuffer, const uchar *&Payload, const uchar StreamID, const ePesHeader MpegLevel);
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inline bool ScanDataForStartCodeSlow(const uchar *const Data);
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inline bool ScanDataForStartCodeFast(const uchar *&Data, const uchar *Limit);
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inline bool ScanDataForStartCode(const uchar *&Data, int &Done, int &Todo);
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inline void AdjustCounters(const int Delta, int &Done, int &Todo);
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inline bool ScanForEndOfPictureSlow(const uchar *&Data);
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inline bool ScanForEndOfPictureFast(const uchar *&Data, const uchar *Limit);
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inline bool ScanForEndOfPicture(const uchar *&Data, const uchar *Limit);
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public:
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cVideoRepacker(void);
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virtual void Reset(void);
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@ -267,6 +275,162 @@ void cVideoRepacker::Reset(void)
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state = syncing;
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}
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void cVideoRepacker::HandleStartCode(const uchar *const Data, cRingBufferLinear *const ResultBuffer, const uchar *&Payload, const uchar StreamID, const ePesHeader MpegLevel)
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{
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// synchronisation is detected some bytes after frame start.
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const int SkippedBytesLimit = 4;
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// which kind of start code have we got?
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switch (*Data) {
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case 0xB9 ... 0xFF: // system start codes
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LOG("cVideoRepacker: found system start code: stream seems to be scrambled or not demultiplexed");
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break;
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case 0xB0 ... 0xB1: // reserved start codes
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case 0xB6:
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LOG("cVideoRepacker: found reserved start code: stream seems to be scrambled");
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break;
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case 0xB4: // sequence error code
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LOG("cVideoRepacker: found sequence error code: stream seems to be damaged");
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case 0xB2: // user data start code
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case 0xB5: // extension start code
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break;
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case 0xB7: // sequence end code
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case 0xB3: // sequence header code
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case 0xB8: // group start code
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case 0x00: // picture start code
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if (state == scanPicture) {
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// the above start codes indicate that the current picture is done. So
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// push out the packet to start a new packet for the next picuture. If
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// the byte count get's negative then the current buffer ends in a
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// partitial start code that must be stripped off, as it shall be put
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// in the next packet.
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PushOutPacket(ResultBuffer, Payload, Data - 3 - Payload);
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// go on with syncing to the next picture
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state = syncing;
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}
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if (state == syncing) {
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if (initiallySyncing) // omit report for the typical initial case
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initiallySyncing = false;
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else if (skippedBytes > SkippedBytesLimit) // report that syncing dropped some bytes
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LOG("cVideoRepacker: skipped %d bytes to sync on next picture", skippedBytes - SkippedBytesLimit);
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skippedBytes = 0;
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// if there is a PES header available, then use it ...
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if (pesHeaderBackupLen > 0) {
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// ISO 13818-1 says:
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// In the case of video, if a PTS is present in a PES packet header
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// it shall refer to the access unit containing the first picture start
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// code that commences in this PES packet. A picture start code commences
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// in PES packet if the first byte of the picture start code is present
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// in the PES packet.
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memcpy(pesHeader, pesHeaderBackup, pesHeaderBackupLen);
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pesHeaderLen = pesHeaderBackupLen;
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pesHeaderBackupLen = 0;
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}
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else {
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// ... otherwise create a continuation PES header
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pesHeaderLen = 0;
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pesHeader[pesHeaderLen++] = 0x00;
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pesHeader[pesHeaderLen++] = 0x00;
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pesHeader[pesHeaderLen++] = 0x01;
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pesHeader[pesHeaderLen++] = StreamID; // video stream ID
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pesHeader[pesHeaderLen++] = 0x00; // length still unknown
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pesHeader[pesHeaderLen++] = 0x00; // length still unknown
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if (MpegLevel == phMPEG2) {
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pesHeader[pesHeaderLen++] = 0x80;
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pesHeader[pesHeaderLen++] = 0x00;
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pesHeader[pesHeaderLen++] = 0x00;
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}
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else
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pesHeader[pesHeaderLen++] = 0x0F;
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}
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// append the first three bytes of the start code
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pesHeader[pesHeaderLen++] = 0x00;
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pesHeader[pesHeaderLen++] = 0x00;
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pesHeader[pesHeaderLen++] = 0x01;
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// the next packet's payload will begin with the fourth byte of
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// the start code (= the actual code)
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Payload = Data;
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// as there is no length information available, assume the
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// maximum we can hold in one PES packet
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packetTodo = maxPacketSize - pesHeaderLen;
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// go on with finding the picture data
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state++;
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}
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break;
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case 0x01 ... 0xAF: // slice start codes
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if (state == findPicture) {
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// go on with scanning the picture data
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state++;
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}
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break;
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}
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}
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bool cVideoRepacker::ScanDataForStartCodeSlow(const uchar *const Data)
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{
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scanner <<= 8;
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bool FoundStartCode = (scanner == 0x00000100);
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scanner |= *Data;
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return FoundStartCode;
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}
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bool cVideoRepacker::ScanDataForStartCodeFast(const uchar *&Data, const uchar *Limit)
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{
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Limit--;
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while (Data < Limit && (Data = (const uchar *)memchr(Data, 0x01, Limit - Data))) {
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if (Data[-2] || Data[-1])
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Data += 3;
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else {
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scanner = 0x00000100 | *++Data;
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return true;
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}
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}
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Data = Limit;
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unsigned long *Scanner = (unsigned long *)(Data - 3);
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scanner = ntohl(*Scanner);
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return false;
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}
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bool cVideoRepacker::ScanDataForStartCode(const uchar *&Data, int &Done, int &Todo)
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{
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const uchar *const DataOrig = Data;
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const int MinDataSize = 4;
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if (Todo < MinDataSize || (state != syncing && packetTodo < MinDataSize))
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return ScanDataForStartCodeSlow(Data);
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int Limit = Todo;
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if (state != syncing && Limit > packetTodo)
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Limit = packetTodo;
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if (ScanDataForStartCodeSlow(Data))
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return true;
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if (ScanDataForStartCodeSlow(++Data)) {
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AdjustCounters(1, Done, Todo);
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return true;
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}
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++Data;
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bool FoundStartCode = ScanDataForStartCodeFast(Data, DataOrig + Limit);
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AdjustCounters(Data - DataOrig, Done, Todo);
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return FoundStartCode;
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}
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void cVideoRepacker::AdjustCounters(const int Delta, int &Done, int &Todo)
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{
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Done += Delta;
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Todo -= Delta;
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if (state <= syncing)
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skippedBytes += Delta;
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else
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packetTodo -= Delta;
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}
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void cVideoRepacker::Repack(cRingBufferLinear *ResultBuffer, const uchar *Data, int Count)
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{
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// synchronisation is detected some bytes after frame start.
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@ -300,98 +464,9 @@ void cVideoRepacker::Repack(cRingBufferLinear *ResultBuffer, const uchar *Data,
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if (state <= syncing)
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skippedBytes++;
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// did we reach a start code?
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scanner <<= 8;
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if (scanner != 0x00000100)
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scanner |= *data;
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else {
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scanner |= *data;
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// which kind of start code have we got?
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switch (*data) {
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case 0xB9 ... 0xFF: // system start codes
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LOG("cVideoRepacker: found system start code: stream seems to be scrambled or not demultiplexed");
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break;
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case 0xB0 ... 0xB1: // reserved start codes
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case 0xB6:
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LOG("cVideoRepacker: found reserved start code: stream seems to be scrambled");
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break;
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case 0xB4: // sequence error code
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LOG("cVideoRepacker: found sequence error code: stream seems to be damaged");
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case 0xB2: // user data start code
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case 0xB5: // extension start code
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break;
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case 0xB7: // sequence end code
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case 0xB3: // sequence header code
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case 0xB8: // group start code
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case 0x00: // picture start code
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if (state == scanPicture) {
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// the above start codes indicate that the current picture is done. So
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// push out the packet to start a new packet for the next picuture. If
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// the byte count get's negative then the current buffer ends in a
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// partitial start code that must be stripped off, as it shall be put
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// in the next packet.
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PushOutPacket(ResultBuffer, payload, data - 3 - payload);
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// go on with syncing to the next picture
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state = syncing;
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}
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if (state == syncing) {
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if (initiallySyncing) // omit report for the typical initial case
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initiallySyncing = false;
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else if (skippedBytes > SkippedBytesLimit) // report that syncing dropped some bytes
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LOG("cVideoRepacker: skipped %d bytes to sync on next picture", skippedBytes - SkippedBytesLimit);
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skippedBytes = 0;
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// if there is a PES header available, then use it ...
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if (pesHeaderBackupLen > 0) {
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// ISO 13818-1 says:
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// In the case of video, if a PTS is present in a PES packet header
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// it shall refer to the access unit containing the first picture start
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// code that commences in this PES packet. A picture start code commences
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// in PES packet if the first byte of the picture start code is present
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// in the PES packet.
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memcpy(pesHeader, pesHeaderBackup, pesHeaderBackupLen);
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pesHeaderLen = pesHeaderBackupLen;
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pesHeaderBackupLen = 0;
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}
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else {
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// ... otherwise create a continuation PES header
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pesHeaderLen = 0;
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pesHeader[pesHeaderLen++] = 0x00;
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pesHeader[pesHeaderLen++] = 0x00;
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pesHeader[pesHeaderLen++] = 0x01;
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pesHeader[pesHeaderLen++] = Data[3]; // video stream ID
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pesHeader[pesHeaderLen++] = 0x00; // length still unknown
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pesHeader[pesHeaderLen++] = 0x00; // length still unknown
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if (mpegLevel == phMPEG2) {
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pesHeader[pesHeaderLen++] = 0x80;
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pesHeader[pesHeaderLen++] = 0x00;
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pesHeader[pesHeaderLen++] = 0x00;
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}
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else
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pesHeader[pesHeaderLen++] = 0x0F;
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}
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// append the first three bytes of the start code
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pesHeader[pesHeaderLen++] = 0x00;
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pesHeader[pesHeaderLen++] = 0x00;
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pesHeader[pesHeaderLen++] = 0x01;
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// the next packet's payload will begin with the fourth byte of
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// the start code (= the actual code)
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payload = data;
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// as there is no length information available, assume the
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// maximum we can hold in one PES packet
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packetTodo = maxPacketSize - pesHeaderLen;
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// go on with finding the picture data
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state++;
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}
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break;
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case 0x01 ... 0xAF: // slice start codes
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if (state == findPicture) {
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// go on with scanning the picture data
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state++;
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}
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break;
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}
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}
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if (ScanDataForStartCode(data, done, todo))
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HandleStartCode(data, ResultBuffer, payload, Data[3], mpegLevel);
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// move on
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data++;
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done++;
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todo--;
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@ -501,6 +576,79 @@ void cVideoRepacker::Repack(cRingBufferLinear *ResultBuffer, const uchar *Data,
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}
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}
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bool cVideoRepacker::ScanForEndOfPictureSlow(const uchar *&Data)
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{
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localScanner <<= 8;
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localScanner |= *Data++;
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// check start codes which follow picture data
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switch (localScanner) {
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case 0x00000100: // picture start code
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case 0x000001B8: // group start code
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case 0x000001B3: // sequence header code
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case 0x000001B7: // sequence end code
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return true;
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}
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return false;
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}
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bool cVideoRepacker::ScanForEndOfPictureFast(const uchar *&Data, const uchar *Limit)
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{
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Limit--;
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while (Data < Limit && (Data = (const uchar *)memchr(Data, 0x01, Limit - Data))) {
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if (Data[-2] || Data[-1])
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Data += 3;
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else {
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localScanner = 0x00000100 | *++Data;
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// check start codes which follow picture data
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switch (localScanner) {
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case 0x00000100: // picture start code
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case 0x000001B8: // group start code
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case 0x000001B3: // sequence header code
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case 0x000001B7: // sequence end code
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Data++;
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return true;
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default:
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Data += 3;
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}
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}
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}
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Data = Limit + 1;
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unsigned long *LocalScanner = (unsigned long *)(Data - 4);
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localScanner = ntohl(*LocalScanner);
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return false;
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}
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bool cVideoRepacker::ScanForEndOfPicture(const uchar *&Data, const uchar *Limit)
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{
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const uchar *const DataOrig = Data;
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const int MinDataSize = 4;
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bool FoundEndOfPicture;
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if (Limit - Data <= MinDataSize) {
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FoundEndOfPicture = false;
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while (Data < Limit) {
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if (ScanForEndOfPictureSlow(Data)) {
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FoundEndOfPicture = true;
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break;
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}
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}
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}
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else {
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FoundEndOfPicture = true;
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if (!ScanForEndOfPictureSlow(Data)) {
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if (!ScanForEndOfPictureSlow(Data)) {
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if (!ScanForEndOfPictureFast(Data, Limit))
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FoundEndOfPicture = false;
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}
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}
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}
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localStart += (Data - DataOrig);
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return FoundEndOfPicture;
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}
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int cVideoRepacker::BreakAt(const uchar *Data, int Count)
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{
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if (initiallySyncing)
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@ -522,20 +670,9 @@ int cVideoRepacker::BreakAt(const uchar *Data, int Count)
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const uchar *data = Data + PesPayloadOffset + localStart;
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const uchar *limit = Data + Count;
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// scan data
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while (data < limit) {
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localStart++;
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localScanner <<= 8;
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localScanner |= *data++;
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// check start codes which follow picture data
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switch (localScanner) {
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case 0x00000100: // picture start code
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case 0x000001B8: // group start code
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case 0x000001B3: // sequence header code
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case 0x000001B7: // sequence end code
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if (ScanForEndOfPicture(data, limit))
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return data - Data;
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}
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}
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}
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// just fill up packet and append next start code
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return PesPayloadOffset + packetTodo + 4;
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}
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