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https://github.com/vdr-projects/vdr.git
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Modified cFrameDetector::Analyze() to minimize file I/O overhead during recording
This commit is contained in:
Klaus Schmidinger
@@ -2426,3 +2426,6 @@ Derek Kelly (user.vdr@gmail.com)
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Marcel Unbehaun <frostworks@gmx.de>
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for adding cRecordingInfo::GetEvent()
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G<EFBFBD>nter Niedermeier <linuxtv@ncs-online.de>
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for reporting a problem with file I/O overhead during recording in TS format
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3
HISTORY
3
HISTORY
@@ -6003,3 +6003,6 @@ Video Disk Recorder Revision History
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- Adapted cFrameDetector::Analyze() to HD NTSC broadcasts that split frames over
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several payload units (thanks to Derek Kelly for reporting this and helping in
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testing).
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- Modified cFrameDetector::Analyze() to make it process whole frames at once, so
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that file I/O overhead is minimized during recording (reported by G<>nter
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Niedermeier).
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261
remux.c
261
remux.c
@@ -4,7 +4,7 @@
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* See the main source file 'vdr.c' for copyright information and
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* how to reach the author.
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*
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* $Id: remux.c 2.15 2009/03/27 13:32:11 kls Exp $
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* $Id: remux.c 2.16 2009/03/27 13:49:58 kls Exp $
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*/
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#include "remux.h"
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@@ -697,137 +697,142 @@ static int CmpUint32(const void *p1, const void *p2)
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int cFrameDetector::Analyze(const uchar *Data, int Length)
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{
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int Processed = 0;
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newFrame = independentFrame = false;
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if (Length >= TS_SIZE) {
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if (TsHasPayload(Data) && !TsIsScrambled(Data) && TsPid(Data) == pid) {
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if (TsPayloadStart(Data)) {
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if (!frameDuration) {
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// frame duration unknown, so collect a sequenece of PTS values:
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if (numPtsValues < MaxPtsValues && numIFrames < 2) { // collect a sequence containing at least two I-frames
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const uchar *Pes = Data + TsPayloadOffset(Data);
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if (PesHasPts(Pes)) {
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ptsValues[numPtsValues] = PesGetPts(Pes);
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// check for rollover:
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if (numPtsValues && ptsValues[numPtsValues - 1] > 0xF0000000 && ptsValues[numPtsValues] < 0x10000000) {
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dbgframes("#");
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numPtsValues = 0;
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numIFrames = 0;
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}
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else
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numPtsValues++;
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}
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}
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else {
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// find the smallest PTS delta:
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qsort(ptsValues, numPtsValues, sizeof(uint32_t), CmpUint32);
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numPtsValues--;
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for (int i = 0; i < numPtsValues; i++)
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ptsValues[i] = ptsValues[i + 1] - ptsValues[i];
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qsort(ptsValues, numPtsValues, sizeof(uint32_t), CmpUint32);
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uint32_t Delta = ptsValues[0];
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// determine frame info:
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if (isVideo) {
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if (Delta % 3600 == 0)
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frameDuration = 3600; // PAL, 25 fps
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else if (Delta % 3003 == 0)
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frameDuration = 3003; // NTSC, 29.97 fps
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else if (Delta == 1501) {
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frameDuration = 3003; // NTSC, 29.97 fps
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framesPerPayloadUnit = -2;
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}
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else {
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frameDuration = 3600; // unknown, assuming 25 fps
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dsyslog("unknown frame duration (%d), assuming 25 fps", Delta);
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}
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}
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else // audio
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frameDuration = Delta; // PTS of audio frames is always increasing
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dbgframes("\nframe duration = %d FPS = %5.2f FPPU = %d\n", frameDuration, 90000.0 / frameDuration, framesPerPayloadUnit);
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}
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}
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scanner = 0;
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scanning = true;
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}
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if (scanning) {
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int PayloadOffset = TsPayloadOffset(Data);
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while (Length >= TS_SIZE) {
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if (TsHasPayload(Data) && !TsIsScrambled(Data) && TsPid(Data) == pid) {
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if (TsPayloadStart(Data)) {
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PayloadOffset += PesPayloadOffset(Data + PayloadOffset);
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if (!framesPerPayloadUnit)
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framesPerPayloadUnit = framesInPayloadUnit;
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if (DebugFrames && !synced)
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dbgframes("/");
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}
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for (int i = PayloadOffset; i < TS_SIZE; i++) {
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scanner <<= 8;
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scanner |= Data[i];
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switch (type) {
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case 0x02: // MPEG 2 video
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if (scanner == 0x00000100) { // Picture Start Code
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newFrame = true;
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independentFrame = ((Data[i + 2] >> 3) & 0x07) == 1; // I-Frame
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if (synced) {
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if (framesPerPayloadUnit <= 1) {
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scanning = false;
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return TS_SIZE;
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}
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}
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else {
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framesInPayloadUnit++;
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if (independentFrame)
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numIFrames++;
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dbgframes("%d ", (Data[i + 2] >> 3) & 0x07);
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}
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scanner = 0;
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}
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break;
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case 0x1B: // MPEG 4 video
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if (scanner == 0x00000109) { // Access Unit Delimiter
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newFrame = true;
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independentFrame = Data[i + 1] == 0x10;
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if (synced) {
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if (framesPerPayloadUnit < 0) {
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payloadUnitOfFrame = (payloadUnitOfFrame + 1) % -framesPerPayloadUnit;
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if (payloadUnitOfFrame != 0 && independentFrame)
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payloadUnitOfFrame = 0;
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if (payloadUnitOfFrame)
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newFrame = false;
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}
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if (framesPerPayloadUnit <= 1) {
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scanning = false;
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return TS_SIZE;
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}
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}
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else {
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framesInPayloadUnit++;
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if (independentFrame)
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numIFrames++;
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dbgframes("%02X ", Data[i + 1]);
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}
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scanner = 0;
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}
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break;
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case 0x04: // MPEG audio
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case 0x06: // AC3 audio
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newFrame = true;
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independentFrame = true;
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if (synced)
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scanning = false;
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else {
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framesInPayloadUnit = 1;
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numIFrames++;
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}
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break;
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default: esyslog("ERROR: unknown stream type %d (PID %d) in frame detector", type, pid);
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pid = 0; // let's just ignore any further data
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if (!frameDuration) {
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// frame duration unknown, so collect a sequenece of PTS values:
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if (numPtsValues < MaxPtsValues && numIFrames < 2) { // collect a sequence containing at least two I-frames
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const uchar *Pes = Data + TsPayloadOffset(Data);
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if (PesHasPts(Pes)) {
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ptsValues[numPtsValues] = PesGetPts(Pes);
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// check for rollover:
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if (numPtsValues && ptsValues[numPtsValues - 1] > 0xF0000000 && ptsValues[numPtsValues] < 0x10000000) {
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dbgframes("#");
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numPtsValues = 0;
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numIFrames = 0;
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}
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else
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numPtsValues++;
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}
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}
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else {
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// find the smallest PTS delta:
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qsort(ptsValues, numPtsValues, sizeof(uint32_t), CmpUint32);
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numPtsValues--;
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for (int i = 0; i < numPtsValues; i++)
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ptsValues[i] = ptsValues[i + 1] - ptsValues[i];
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qsort(ptsValues, numPtsValues, sizeof(uint32_t), CmpUint32);
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uint32_t Delta = ptsValues[0];
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// determine frame info:
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if (isVideo) {
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if (Delta % 3600 == 0)
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frameDuration = 3600; // PAL, 25 fps
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else if (Delta % 3003 == 0)
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frameDuration = 3003; // NTSC, 29.97 fps
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else if (Delta == 1501) {
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frameDuration = 3003; // NTSC, 29.97 fps
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framesPerPayloadUnit = -2;
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}
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else {
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frameDuration = 3600; // unknown, assuming 25 fps
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dsyslog("unknown frame duration (%d), assuming 25 fps", Delta);
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}
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}
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else // audio
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frameDuration = Delta; // PTS of audio frames is always increasing
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dbgframes("\nframe duration = %d FPS = %5.2f FPPU = %d\n", frameDuration, 90000.0 / frameDuration, framesPerPayloadUnit);
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}
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}
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scanner = 0;
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scanning = true;
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}
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if (scanning) {
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int PayloadOffset = TsPayloadOffset(Data);
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if (TsPayloadStart(Data)) {
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PayloadOffset += PesPayloadOffset(Data + PayloadOffset);
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if (!framesPerPayloadUnit)
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framesPerPayloadUnit = framesInPayloadUnit;
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if (DebugFrames && !synced)
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dbgframes("/");
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}
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for (int i = PayloadOffset; i < TS_SIZE; i++) {
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scanner <<= 8;
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scanner |= Data[i];
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switch (type) {
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case 0x02: // MPEG 2 video
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if (scanner == 0x00000100) { // Picture Start Code
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if (synced && Processed)
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return Processed;
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newFrame = true;
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independentFrame = ((Data[i + 2] >> 3) & 0x07) == 1; // I-Frame
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if (synced) {
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if (framesPerPayloadUnit <= 1)
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scanning = false;
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}
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else {
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framesInPayloadUnit++;
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if (independentFrame)
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numIFrames++;
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dbgframes("%d ", (Data[i + 2] >> 3) & 0x07);
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}
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scanner = 0;
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}
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break;
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case 0x1B: // MPEG 4 video
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if (scanner == 0x00000109) { // Access Unit Delimiter
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if (synced && Processed)
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return Processed;
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newFrame = true;
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independentFrame = Data[i + 1] == 0x10;
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if (synced) {
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if (framesPerPayloadUnit < 0) {
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payloadUnitOfFrame = (payloadUnitOfFrame + 1) % -framesPerPayloadUnit;
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if (payloadUnitOfFrame != 0 && independentFrame)
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payloadUnitOfFrame = 0;
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if (payloadUnitOfFrame)
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newFrame = false;
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}
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if (framesPerPayloadUnit <= 1)
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scanning = false;
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}
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else {
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framesInPayloadUnit++;
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if (independentFrame)
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numIFrames++;
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dbgframes("%02X ", Data[i + 1]);
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}
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scanner = 0;
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}
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break;
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case 0x04: // MPEG audio
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case 0x06: // AC3 audio
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if (synced && Processed)
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return Processed;
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newFrame = true;
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independentFrame = true;
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if (synced)
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scanning = false;
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else {
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framesInPayloadUnit = 1;
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numIFrames++;
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}
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break;
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default: esyslog("ERROR: unknown stream type %d (PID %d) in frame detector", type, pid);
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pid = 0; // let's just ignore any further data
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}
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}
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if (!synced && frameDuration && independentFrame) {
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synced = true;
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dbgframes("*");
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}
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}
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if (!synced && frameDuration && independentFrame) {
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synced = true;
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dbgframes("*");
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}
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}
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Data += TS_SIZE;
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Length -= TS_SIZE;
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Processed += TS_SIZE;
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}
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return TS_SIZE;
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}
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return 0;
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return Processed;
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}
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