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dtvrecorder.cpp
1355 lines (1159 loc) · 42.2 KB
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dtvrecorder.cpp
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/**
* DTVRecorder -- base class for Digital Televison recorders
* Copyright 2003-2004 by Brandon Beattie, Doug Larrick,
* Jason Hoos, and Daniel Thor Kristjansson
*
* 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 of the License, 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 this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "atscstreamdata.h"
#include "mpegstreamdata.h"
#include "dvbstreamdata.h"
#include "dtvrecorder.h"
#include "programinfo.h"
#include "mythlogging.h"
#include "mpegtables.h"
#include "ringbuffer.h"
#include "tv_rec.h"
extern "C" {
#include "libavcodec/mpegvideo.h"
}
#define LOC ((tvrec) ? \
QString("DTVRec(%1): ").arg(tvrec->GetCaptureCardNum()) : \
QString("DTVRec(0x%1): ").arg(intptr_t(this),0,16))
const uint DTVRecorder::kMaxKeyFrameDistance = 80;
/** \class DTVRecorder
* \brief This is a specialization of RecorderBase used to
* handle MPEG-2, MPEG-4, MPEG-4 AVC, DVB and ATSC streams.
*
* \sa DBox2Recorder, DVBRecorder, FirewireRecorder,
HDHRRecoreder, IPTVRecorder
*/
DTVRecorder::DTVRecorder(TVRec *rec) :
RecorderBase(rec),
// file handle for stream
_stream_fd(-1),
_recording_type("all"),
// used for scanning pes headers for keyframes
_start_code(0xffffffff), _first_keyframe(-1),
_last_gop_seen(0), _last_seq_seen(0),
_last_keyframe_seen(0),
_audio_bytes_remaining(0), _video_bytes_remaining(0),
_other_bytes_remaining(0),
// MPEG2 parser information
_progressive_sequence(0),
_repeat_pict(0),
// H.264 support
_pes_synced(false),
_seen_sps(false),
// settings
_wait_for_keyframe_option(true),
_has_written_other_keyframe(false),
// state
_error(),
_stream_data(NULL),
// TS packet buffer
// keyframe TS buffer
_buffer_packets(false),
// general recorder stuff
_pid_lock(QMutex::Recursive),
_input_pat(NULL),
_input_pmt(NULL),
_has_no_av(false),
// statistics
_use_pts(false),
_packet_count(0),
_continuity_error_count(0),
_frames_seen_count(0), _frames_written_count(0)
{
SetPositionMapType(MARK_GOP_BYFRAME);
_payload_buffer.reserve(TSPacket::kSize * (50 + 1));
ResetForNewFile();
}
DTVRecorder::~DTVRecorder()
{
StopRecording();
SetStreamData(NULL);
if (_input_pat)
{
delete _input_pat;
_input_pat = NULL;
}
if (_input_pmt)
{
delete _input_pmt;
_input_pmt = NULL;
}
}
void DTVRecorder::SetOption(const QString &name, const QString &value)
{
if (name == "recordingtype")
{
_recording_type = value;
_recording_type.detach();
}
else
RecorderBase::SetOption(name, value);
}
/** \fn DTVRecorder::SetOption(const QString&,int)
* \brief handles the "wait_for_seqstart" option.
*/
void DTVRecorder::SetOption(const QString &name, int value)
{
if (name == "wait_for_seqstart")
_wait_for_keyframe_option = (value == 1);
else
RecorderBase::SetOption(name, value);
}
void DTVRecorder::SetOptionsFromProfile(RecordingProfile *profile,
const QString &videodev,
const QString&, const QString&)
{
SetOption("videodevice", videodev);
DTVRecorder::SetOption("tvformat", gCoreContext->GetSetting("TVFormat"));
SetStrOption(profile, "recordingtype");
}
/** \fn DTVRecorder::FinishRecording(void)
* \brief Flushes the ringbuffer, and if this is not a live LiveTV
* recording saves the position map and filesize.
*/
void DTVRecorder::FinishRecording(void)
{
if (ringBuffer)
{
if (!_payload_buffer.empty())
{
ringBuffer->Write(&_payload_buffer[0], _payload_buffer.size());
_payload_buffer.clear();
}
ringBuffer->WriterFlush();
}
if (curRecording)
{
if (ringBuffer)
curRecording->SaveFilesize(ringBuffer->GetRealFileSize());
SavePositionMap(true);
}
}
void DTVRecorder::ResetForNewFile(void)
{
LOG(VB_RECORD, LOG_INFO, LOC + "ResetForNewFile(void)");
QMutexLocker locker(&positionMapLock);
// _first_keyframe, _seen_psp and m_h264_parser should
// not be reset here. This will only be called just as
// we're seeing the first packet of a new keyframe for
// writing to the new file and anything that makes the
// recorder think we're waiting on another keyframe will
// send significant amounts of good data to /dev/null.
// -- Daniel Kristjansson 2011-02-26
_start_code = 0xffffffff;
//_first_keyframe
_has_written_other_keyframe = false;
_last_keyframe_seen = 0;
_last_gop_seen = 0;
_last_seq_seen = 0;
_audio_bytes_remaining = 0;
_video_bytes_remaining = 0;
_other_bytes_remaining = 0;
//_recording
_error = QString();
memset(_stream_id, 0, sizeof(_stream_id));
memset(_pid_status, 0, sizeof(_pid_status));
memset(_continuity_counter, 0xff, sizeof(_continuity_counter));
_progressive_sequence = 0;
_repeat_pict = 0;
_pes_synced = false;
//_seen_sps
positionMap.clear();
positionMapDelta.clear();
_payload_buffer.clear();
locker.unlock();
ClearStatistics();
}
void DTVRecorder::ClearStatistics(void)
{
RecorderBase::ClearStatistics();
memset(_ts_count, 0, sizeof(_ts_count));
for (int i = 0; i < 256; i++)
_ts_last[i] = -1LL;
for (int i = 0; i < 256; i++)
_ts_first[i] = -1LL;
//_ts_first_dt -- doesn't need to be cleared only used if _ts_first>=0
_packet_count.fetchAndStoreRelaxed(0);
_continuity_error_count.fetchAndStoreRelaxed(0);
_frames_seen_count = 0;
_frames_written_count = 0;
}
// documented in recorderbase.h
void DTVRecorder::Reset(void)
{
LOG(VB_RECORD, LOG_INFO, LOC + "Reset(void)");
ResetForNewFile();
_start_code = 0xffffffff;
if (curRecording)
curRecording->ClearPositionMap(MARK_GOP_BYFRAME);
}
void DTVRecorder::SetStreamData(MPEGStreamData *data)
{
if (data == _stream_data)
return;
MPEGStreamData *old_data = _stream_data;
_stream_data = data;
if (old_data)
delete old_data;
if (_stream_data)
InitStreamData();
}
void DTVRecorder::InitStreamData(void)
{
_stream_data->AddMPEGSPListener(this);
_stream_data->AddMPEGListener(this);
DVBStreamData *dvb = dynamic_cast<DVBStreamData*>(_stream_data);
if (dvb)
dvb->AddDVBMainListener(this);
ATSCStreamData *atsc = dynamic_cast<ATSCStreamData*>(_stream_data);
if (atsc && atsc->DesiredMinorChannel())
atsc->SetDesiredChannel(atsc->DesiredMajorChannel(),
atsc->DesiredMinorChannel());
else if (_stream_data->DesiredProgram() >= 0)
_stream_data->SetDesiredProgram(_stream_data->DesiredProgram());
}
void DTVRecorder::BufferedWrite(const TSPacket &tspacket)
{
// delay until first GOP to avoid decoder crash on res change
if (_wait_for_keyframe_option && _first_keyframe<0)
return;
if (curRecording && timeOfFirstDataIsSet.testAndSetRelaxed(0,1))
{
QMutexLocker locker(&statisticsLock);
timeOfFirstData = MythDate::current();
timeOfLatestData = MythDate::current();
timeOfLatestDataTimer.start();
}
int val = timeOfLatestDataCount.fetchAndAddRelaxed(1);
int thresh = timeOfLatestDataPacketInterval.fetchAndAddRelaxed(0);
if (val > thresh)
{
QMutexLocker locker(&statisticsLock);
uint elapsed = timeOfLatestDataTimer.restart();
int interval = thresh;
if (elapsed > kTimeOfLatestDataIntervalTarget + 250)
interval = timeOfLatestDataPacketInterval
.fetchAndStoreRelaxed(thresh * 4 / 5);
else if (elapsed + 250 < kTimeOfLatestDataIntervalTarget)
interval = timeOfLatestDataPacketInterval
.fetchAndStoreRelaxed(thresh * 9 / 8);
timeOfLatestDataCount.fetchAndStoreRelaxed(1);
timeOfLatestData = MythDate::current();
LOG(VB_RECORD, LOG_DEBUG, LOC + QString("Updating timeOfLatestData ") +
QString("elapsed(%1) interval(%2)")
.arg(elapsed).arg(interval));
}
// Do we have to buffer the packet for exact keyframe detection?
if (_buffer_packets)
{
int idx = _payload_buffer.size();
_payload_buffer.resize(idx + TSPacket::kSize);
memcpy(&_payload_buffer[idx], tspacket.data(), TSPacket::kSize);
return;
}
// We are free to write the packet, but if we have buffered packet[s]
// we have to write them first...
if (!_payload_buffer.empty())
{
if (ringBuffer)
ringBuffer->Write(&_payload_buffer[0], _payload_buffer.size());
_payload_buffer.clear();
}
if (ringBuffer)
ringBuffer->Write(tspacket.data(), TSPacket::kSize);
}
enum { kExtractPTS, kExtractDTS };
static int64_t extract_timestamp(
const uint8_t *bufptr, int bytes_left, int pts_or_dts)
{
if (bytes_left < 4)
return -1LL;
bool has_pts = bufptr[3] & 0x80;
int offset = 5;
if (((kExtractPTS == pts_or_dts) && !has_pts) || (offset + 5 > bytes_left))
return -1LL;
bool has_dts = bufptr[3] & 0x40;
if (kExtractDTS == pts_or_dts)
{
if (!has_dts)
return -1LL;
offset += has_pts ? 5 : 0;
if (offset + 5 > bytes_left)
return -1LL;
}
return ((uint64_t(bufptr[offset+0] & 0x0e) << 29) |
(uint64_t(bufptr[offset+1] ) << 22) |
(uint64_t(bufptr[offset+2] & 0xfe) << 14) |
(uint64_t(bufptr[offset+3] ) << 7) |
(uint64_t(bufptr[offset+4] & 0xfe) >> 1));
}
static QDateTime ts_to_qdatetime(
uint64_t pts, uint64_t pts_first, QDateTime &pts_first_dt)
{
if (pts < pts_first)
pts += 0x1FFFFFFFFLL;
QDateTime dt = pts_first_dt;
return dt.addMSecs((pts - pts_first)/90);
}
static const uint frameRateMap[16] = {
0, 23796, 24000, 25000, 29970, 30000, 50000, 59940, 60000,
0, 0, 0, 0, 0, 0, 0
};
/** \fn DTVRecorder::FindMPEG2Keyframes(const TSPacket* tspacket)
* \brief Locates the keyframes and saves them to the position map.
*
* This searches for three magic integers in the stream.
* The picture start code 0x00000100, the GOP code 0x000001B8,
* and the sequence start code 0x000001B3. The GOP code is
* prefered, but is only required of MPEG1 streams, the
* sequence start code is a decent fallback for MPEG2
* streams, and if all else fails we just look for the picture
* start codes and call every 16th frame a keyframe.
*
* NOTE: This does not only find keyframes but also tracks the
* total frames as well. At least a couple times seeking
* has been broken by short-circuiting the search once
* a keyframe stream id has been found. This may work on
* some channels, but will break on others so algorithmic
* optimizations should be done with great care.
*
* \code
* PES header format
* byte 0 byte 1 byte 2 byte 3 [byte 4 byte 5]
* 0x00 0x00 0x01 PESStreamID PES packet length
* \endcode
*
* \return Returns true if packet[s] should be output.
*/
bool DTVRecorder::FindMPEG2Keyframes(const TSPacket* tspacket)
{
bool haveBufferedData = !_payload_buffer.empty();
if (!tspacket->HasPayload()) // no payload to scan
return !haveBufferedData;
if (!ringBuffer)
return !haveBufferedData;
// if packet contains start of PES packet, start
// looking for first byte of MPEG start code (3 bytes 0 0 1)
// otherwise, pick up search where we left off.
const bool payloadStart = tspacket->PayloadStart();
_start_code = (payloadStart) ? 0xffffffff : _start_code;
// Just make these local for efficiency reasons (gcc not so smart..)
const uint maxKFD = kMaxKeyFrameDistance;
bool hasFrame = false;
bool hasKeyFrame = false;
uint aspectRatio = 0;
uint height = 0;
uint width = 0;
uint frameRate = 0;
// Scan for PES header codes; specifically picture_start
// sequence_start (SEQ) and group_start (GOP).
// 00 00 01 00: picture_start_code
// 00 00 01 B8: group_start_code
// 00 00 01 B3: seq_start_code
// 00 00 01 B5: ext_start_code
// (there are others that we don't care about)
const uint8_t *bufptr = tspacket->data() + tspacket->AFCOffset();
const uint8_t *bufend = tspacket->data() + TSPacket::kSize;
int ext_type, bytes_left;
int picture_structure, top_field_first, repeat_first_field, progressive_frame;
_repeat_pict = 0;
while (bufptr < bufend)
{
bufptr = avpriv_mpv_find_start_code(bufptr, bufend, &_start_code);
bytes_left = bufend - bufptr;
if ((_start_code & 0xffffff00) == 0x00000100)
{
// At this point we have seen the start code 0 0 1
// the next byte will be the PES packet stream id.
const int stream_id = _start_code & 0x000000ff;
if (PESStreamID::PictureStartCode == stream_id)
hasFrame = true;
else if (PESStreamID::GOPStartCode == stream_id)
{
_last_gop_seen = _frames_seen_count;
hasKeyFrame |= true;
}
else if (PESStreamID::SequenceStartCode == stream_id)
{
_last_seq_seen = _frames_seen_count;
hasKeyFrame |= (_last_gop_seen + maxKFD)<_frames_seen_count;
// Look for aspectRatio changes and store them in the database
aspectRatio = (bufptr[3] >> 4);
// Get resolution
height = ((bufptr[1] & 0xf) << 8) | bufptr[2];
width = (bufptr[0] <<4) | (bufptr[1]>>4);
frameRate = frameRateMap[(bufptr[3] & 0x0000000f)];
}
else if (PESStreamID::MPEG2ExtensionStartCode == stream_id)
{
if (bytes_left >= 1)
{
ext_type = (bufptr[0] >> 4);
switch(ext_type)
{
case 0x1: /* sequence extension */
if (bytes_left >= 6)
{
_progressive_sequence = bufptr[1] & (1 << 3);
}
break;
case 0x8: /* picture coding extension */
if (bytes_left >= 5)
{
picture_structure = bufptr[2]&3;
top_field_first = bufptr[3] & (1 << 7);
repeat_first_field = bufptr[3] & (1 << 1);
progressive_frame = bufptr[4] & (1 << 7);
/* check if we must repeat the frame */
_repeat_pict = 1;
if (repeat_first_field)
{
if (_progressive_sequence)
{
if (top_field_first)
_repeat_pict = 5;
else
_repeat_pict = 3;
}
else if (progressive_frame)
{
_repeat_pict = 2;
}
}
}
break;
}
}
}
if ((stream_id >= PESStreamID::MPEGVideoStreamBegin) &&
(stream_id <= PESStreamID::MPEGVideoStreamEnd))
{
int64_t pts = extract_timestamp(
bufptr, bytes_left, kExtractPTS);
int64_t dts = extract_timestamp(
bufptr, bytes_left, kExtractPTS);
HandleTimestamps(stream_id, pts, dts);
}
}
}
if (hasFrame && !hasKeyFrame)
{
// If we have seen kMaxKeyFrameDistance frames since the
// last GOP or SEQ stream_id, then pretend this picture
// is a keyframe. We may get artifacts but at least
// we will be able to skip frames.
hasKeyFrame = !(_frames_seen_count & 0xf);
hasKeyFrame &= (_last_gop_seen + maxKFD) < _frames_seen_count;
hasKeyFrame &= (_last_seq_seen + maxKFD) < _frames_seen_count;
}
if (hasKeyFrame)
{
_last_keyframe_seen = _frames_seen_count;
HandleKeyframe(_frames_written_count, TSPacket::kSize);
}
if (hasFrame)
{
_frames_seen_count++;
if (!_wait_for_keyframe_option || _first_keyframe>=0)
_frames_written_count++;
}
if ((aspectRatio > 0) && (aspectRatio != m_videoAspect))
{
m_videoAspect = aspectRatio;
AspectChange((AspectRatio)aspectRatio, _frames_written_count);
}
if (height && width && (height != m_videoHeight || m_videoWidth != width))
{
m_videoHeight = height;
m_videoWidth = width;
ResolutionChange(width, height, _frames_written_count);
}
if (frameRate && frameRate != m_frameRate)
{
m_frameRate = frameRate;
LOG(VB_RECORD, LOG_INFO, LOC +
QString("FindMPEG2Keyframes: frame rate = %1") .arg(frameRate));
FrameRateChange(frameRate, _frames_written_count);
}
return hasKeyFrame || (_payload_buffer.size() >= (188*50));
}
void DTVRecorder::HandleTimestamps(int stream_id, int64_t pts, int64_t dts)
{
if (pts < 0)
{
_ts_last[stream_id] = -1;
return;
}
if ((dts < 0) && !_use_pts)
{
_ts_last[stream_id] = -1;
_use_pts = true;
LOG(VB_RECORD, LOG_DEBUG,
"Switching from dts tracking to pts tracking." +
QString("TS count is %1").arg(_ts_count[stream_id]));
}
int64_t ts = dts;
int64_t gap_threshold = 90000; // 1 second
if (_use_pts)
{
ts = dts;
gap_threshold = 2*90000; // two seconds, compensate for GOP ordering
}
if (_ts_last[stream_id] >= 0)
{
int64_t diff = ts - _ts_last[stream_id];
if ((diff < 0) && (diff < (10 * -90000)))
diff += 0x1ffffffffLL;
if (diff < 0)
diff = -diff;
if (diff > gap_threshold)
{
QMutexLocker locker(&statisticsLock);
recordingGaps.push_back(
RecordingGap(
ts_to_qdatetime(
_ts_last[stream_id], _ts_first[stream_id],
_ts_first_dt[stream_id]),
ts_to_qdatetime(
ts, _ts_first[stream_id], _ts_first_dt[stream_id])));
LOG(VB_RECORD, LOG_DEBUG, LOC + QString("Inserted gap %1 dur %2")
.arg(recordingGaps.back().toString()).arg(diff/90000.0));
}
}
_ts_last[stream_id] = ts;
if (_ts_count[stream_id] < 30)
{
if (!_ts_count[stream_id])
{
_ts_first[stream_id] = ts;
_ts_first_dt[stream_id] = MythDate::current();
}
else if (ts < _ts_first[stream_id])
{
_ts_first[stream_id] = ts;
_ts_first_dt[stream_id] = MythDate::current();
}
}
_ts_count[stream_id]++;
}
bool DTVRecorder::FindAudioKeyframes(const TSPacket*)
{
bool hasKeyFrame = false;
if (!ringBuffer || (GetStreamData()->VideoPIDSingleProgram() <= 0x1fff))
return hasKeyFrame;
static const uint64_t msec_per_day = 24 * 60 * 60 * 1000ULL;
const double frame_interval = (1000.0 / video_frame_rate);
uint64_t elapsed = (uint64_t) max(_audio_timer.elapsed(), 0);
uint64_t expected_frame =
(uint64_t) ((double)elapsed / frame_interval);
while (_frames_seen_count > expected_frame + 10000)
expected_frame += (uint64_t) ((double)msec_per_day / frame_interval);
if (!_frames_seen_count || (_frames_seen_count < expected_frame))
{
if (!_frames_seen_count)
_audio_timer.start();
_frames_seen_count++;
if (1 == (_frames_seen_count & 0x7))
{
_last_keyframe_seen = _frames_seen_count;
HandleKeyframe(_frames_written_count);
hasKeyFrame = true;
}
if (!_wait_for_keyframe_option || _first_keyframe>=0)
_frames_written_count++;
}
return hasKeyFrame;
}
/// Non-Audio/Video data. For streams which contain no audio/video,
/// write just 1 key-frame at the start.
bool DTVRecorder::FindOtherKeyframes(const TSPacket *tspacket)
{
if (!ringBuffer || (GetStreamData()->VideoPIDSingleProgram() <= 0x1fff))
return true;
if (_has_written_other_keyframe)
return true;
LOG(VB_RECORD, LOG_INFO, LOC + "DSMCC - FindOtherKeyframes() - "
"generating initial key-frame");
_frames_seen_count++;
_frames_written_count++;
_last_keyframe_seen = _frames_seen_count;
HandleKeyframe(_frames_written_count);
_has_written_other_keyframe = true;
return true;
}
// documented in recorderbase.h
void DTVRecorder::SetNextRecording(const RecordingInfo *progInf, RingBuffer *rb)
{
LOG(VB_RECORD, LOG_INFO, LOC + QString("SetNextRecord(0x%1, 0x%2)")
.arg((uint64_t)progInf,0,16).arg((uint64_t)rb,0,16));
// First we do some of the time consuming stuff we can do now
SavePositionMap(true);
if (ringBuffer)
{
ringBuffer->WriterFlush();
if (curRecording)
curRecording->SaveFilesize(ringBuffer->GetRealFileSize());
}
// Then we set the next info
nextRingBufferLock.lock();
nextRecording = NULL;
if (progInf)
nextRecording = new RecordingInfo(*progInf);
nextRingBuffer = rb;
nextRingBufferLock.unlock();
}
/** \fn DTVRecorder::HandleKeyframe(uint64_t)
* \brief This save the current frame to the position maps
* and handles ringbuffer switching.
*/
void DTVRecorder::HandleKeyframe(uint64_t frameNum, int64_t extra)
{
if (!ringBuffer)
return;
#if 0
unsigned long long frameNum = _frames_written_count;
#endif
_first_keyframe = (_first_keyframe < 0) ? frameNum : _first_keyframe;
// Add key frame to position map
positionMapLock.lock();
if (!positionMap.contains(frameNum))
{
long long startpos = ringBuffer->GetWritePosition();
// FIXME: handle keyframes with start code spanning over two ts packets
startpos += _payload_buffer.size() - extra;
// Don't put negative offsets into the database, they get munged into
// MAX_INT64 - offset, which is an exceedingly large number, and
// certainly not valid.
if (startpos >= 0)
{
positionMapDelta[frameNum] = startpos;
positionMap[frameNum] = startpos;
}
}
positionMapLock.unlock();
// Perform ringbuffer switch if needed.
CheckForRingBufferSwitch();
}
/** \fn DTVRecorder::FindH264Keyframes(const TSPacket*)
* \brief This searches the TS packet to identify keyframes.
* \param TSPacket Pointer the the TS packet data.
* \return Returns true if a keyframe has been found.
*/
bool DTVRecorder::FindH264Keyframes(const TSPacket *tspacket)
{
if (!ringBuffer)
{
LOG(VB_GENERAL, LOG_ERR, LOC + "FindH264Keyframes: No ringbuffer");
return false;
}
bool haveBufferedData = !_payload_buffer.empty();
if (!tspacket->HasPayload()) // no payload to scan
return !haveBufferedData;
const bool payloadStart = tspacket->PayloadStart();
if (payloadStart)
{
// reset PES sync state
_pes_synced = false;
_start_code = 0xffffffff;
}
uint aspectRatio = 0;
uint height = 0;
uint width = 0;
uint frameRate = 0;
bool hasFrame = false;
bool hasKeyFrame = false;
// scan for PES packets and H.264 NAL units
uint i = tspacket->AFCOffset();
for (; i < TSPacket::kSize; i++)
{
// special handling required when a new PES packet begins
if (payloadStart && !_pes_synced)
{
// bounds check
if (i + 2 >= TSPacket::kSize)
{
LOG(VB_GENERAL, LOG_ERR, LOC +
"PES packet start code may overflow to next TS packet, "
"aborting keyframe search");
break;
}
// must find the PES start code
if (tspacket->data()[i++] != 0x00 ||
tspacket->data()[i++] != 0x00 ||
tspacket->data()[i++] != 0x01)
{
LOG(VB_GENERAL, LOG_ERR, LOC +
"PES start code not found in TS packet with PUSI set");
break;
}
// bounds check
if (i + 5 >= TSPacket::kSize)
{
LOG(VB_GENERAL, LOG_ERR, LOC +
"PES packet headers overflow to next TS packet, "
"aborting keyframe search");
break;
}
// now we need to compute where the PES payload begins
// skip past the stream_id (+1)
// the next two bytes are the PES packet length (+2)
// after that, one byte of PES packet control bits (+1)
// after that, one byte of PES header flags bits (+1)
// and finally, one byte for the PES header length
const unsigned char pes_header_length = tspacket->data()[i + 5];
// bounds check
if ((i + 6 + pes_header_length) >= TSPacket::kSize)
{
LOG(VB_GENERAL, LOG_ERR, LOC +
"PES packet headers overflow to next TS packet, "
"aborting keyframe search");
break;
}
// we now know where the PES payload is
// normally, we should have used 6, but use 5 because the for
// loop will bump i
i += 5 + pes_header_length;
_pes_synced = true;
#if 0
LOG(VB_RECORD, LOG_DEBUG, LOC + "PES synced");
#endif
continue;
}
// ain't going nowhere if we're not PES synced
if (!_pes_synced)
break;
// scan for a NAL unit start code
uint32_t bytes_used = m_h264_parser.addBytes(
tspacket->data() + i, TSPacket::kSize - i,
ringBuffer->GetWritePosition() + _payload_buffer.size()
);
i += (bytes_used - 1);
if (m_h264_parser.stateChanged())
{
if (m_h264_parser.onFrameStart() &&
m_h264_parser.FieldType() != H264Parser::FIELD_BOTTOM)
{
hasKeyFrame = m_h264_parser.onKeyFrameStart();
hasFrame = true;
_seen_sps |= hasKeyFrame;
width = m_h264_parser.pictureWidth();
height = m_h264_parser.pictureHeight();
aspectRatio = m_h264_parser.aspectRatio();
frameRate = m_h264_parser.frameRate();
}
}
} // for (; i < TSPacket::kSize; i++)
if (hasKeyFrame)
{
_last_keyframe_seen = _frames_seen_count;
HandleH264Keyframe();
}
if (hasFrame)
{
_frames_seen_count++;
if (!_wait_for_keyframe_option || _first_keyframe >= 0)
_frames_written_count++;
}
if ((aspectRatio > 0) && (aspectRatio != m_videoAspect))
{
m_videoAspect = aspectRatio;
AspectChange((AspectRatio)aspectRatio, _frames_written_count);
}
if (height && width && (height != m_videoHeight || m_videoWidth != width))
{
m_videoHeight = height;
m_videoWidth = width;
ResolutionChange(width, height, _frames_written_count);
}
if (frameRate != 0 && frameRate != m_frameRate)
{
LOG(VB_RECORD, LOG_INFO, LOC +
QString("FindH264Keyframes: timescale: %1, tick: %2, framerate: %3")
.arg( m_h264_parser.GetTimeScale() )
.arg( m_h264_parser.GetUnitsInTick() )
.arg( frameRate ) );
m_frameRate = frameRate;
FrameRateChange(frameRate, _frames_written_count);
}
return hasKeyFrame || (_payload_buffer.size() >= (188*50));
}
/** \fn DTVRecorder::HandleH264Keyframe(void)
* \brief This save the current frame to the position maps
* and handles ringbuffer switching.
*/
void DTVRecorder::HandleH264Keyframe(void)
{
unsigned long long frameNum = _frames_written_count;
_first_keyframe = (_first_keyframe < 0) ? frameNum : _first_keyframe;
// Add key frame to position map
positionMapLock.lock();
if (!positionMap.contains(frameNum))
{
positionMapDelta[frameNum] = m_h264_parser.keyframeAUstreamOffset();
positionMap[frameNum] = m_h264_parser.keyframeAUstreamOffset();
}
positionMapLock.unlock();
// Perform ringbuffer switch if needed.
CheckForRingBufferSwitch();
}
void DTVRecorder::FindPSKeyFrames(const uint8_t *buffer, uint len)
{
const uint maxKFD = kMaxKeyFrameDistance;
const uint8_t *bufstart = buffer;
const uint8_t *bufptr = buffer;
const uint8_t *bufend = buffer + len;
uint aspectRatio = 0;
uint height = 0;
uint width = 0;
uint frameRate = 0;
uint skip = std::max(_audio_bytes_remaining, _other_bytes_remaining);
while (bufptr + skip < bufend)
{
bool hasFrame = false;
bool hasKeyFrame = false;
const uint8_t *tmp = bufptr;
bufptr =
avpriv_mpv_find_start_code(bufptr + skip, bufend, &_start_code);
_audio_bytes_remaining = 0;
_other_bytes_remaining = 0;
_video_bytes_remaining -= std::min(
(uint)(bufptr - tmp), _video_bytes_remaining);
if ((_start_code & 0xffffff00) != 0x00000100)
continue;
// NOTE: Length may be zero for packets that only contain bytes from
// video elementary streams in TS packets. 13818-1:2000 2.4.3.7
int pes_packet_length = -1;
if ((bufend - bufptr) >= 2)
pes_packet_length = ((bufptr[0]<<8) | bufptr[1]) + 2 + 6;
const int stream_id = _start_code & 0x000000ff;
if (_video_bytes_remaining)
{
if (PESStreamID::PictureStartCode == stream_id)
{ // pes_packet_length is meaningless
pes_packet_length = -1;
uint frmtypei = 1;
if (bufend-bufptr >= 4)
{
frmtypei = (bufptr[1]>>3) & 0x7;
if ((1 <= frmtypei) && (frmtypei <= 5))
hasFrame = true;
}
else
{
hasFrame = true;
}
}
else if (PESStreamID::GOPStartCode == stream_id)
{ // pes_packet_length is meaningless
pes_packet_length = -1;
_last_gop_seen = _frames_seen_count;