summaryrefslogtreecommitdiff
path: root/remux.c
diff options
context:
space:
mode:
Diffstat (limited to 'remux.c')
-rw-r--r--remux.c203
1 files changed, 135 insertions, 68 deletions
diff --git a/remux.c b/remux.c
index b008621..89fe85d 100644
--- a/remux.c
+++ b/remux.c
@@ -4,7 +4,7 @@
* See the main source file 'vdr.c' for copyright information and
* how to reach the author.
*
- * $Id: remux.c 2.13 2009/01/24 13:44:45 kls Exp $
+ * $Id: remux.c 2.17 2009/04/05 14:07:48 kls Exp $
*/
#include "remux.h"
@@ -109,6 +109,21 @@ void cRemux::SetBrokenLink(uchar *Data, int Length)
dsyslog("SetBrokenLink: no video packet in frame");
}
+// --- Some TS handling tools ------------------------------------------------
+
+int64_t TsGetPts(const uchar *p, int l)
+{
+ // Find the first packet with a PTS and use it:
+ while (l > 0) {
+ const uchar *d = p;
+ if (TsPayloadStart(d) && TsGetPayload(&d) && PesHasPts(d))
+ return PesGetPts(d);
+ p += TS_SIZE;
+ l -= TS_SIZE;
+ }
+ return -1;
+}
+
// --- cPatPmtGenerator ------------------------------------------------------
cPatPmtGenerator::cPatPmtGenerator(cChannel *Channel)
@@ -661,111 +676,163 @@ cFrameDetector::cFrameDetector(int Pid, int Type)
{
pid = Pid;
type = Type;
+ synced = false;
newFrame = independentFrame = false;
- lastPts = 0;
+ numPtsValues = 0;
+ numIFrames = 0;
isVideo = type == 0x02 || type == 0x1B; // MPEG 2 or MPEG 4
frameDuration = 0;
- framesPerPayloadUnit = 0;
+ framesInPayloadUnit = framesPerPayloadUnit = 0;
+ payloadUnitOfFrame = 0;
scanning = false;
scanner = 0;
}
+static int CmpUint32(const void *p1, const void *p2)
+{
+ if (*(uint32_t *)p1 < *(uint32_t *)p2) return -1;
+ if (*(uint32_t *)p1 > *(uint32_t *)p2) return 1;
+ return 0;
+}
+
int cFrameDetector::Analyze(const uchar *Data, int Length)
{
+ int Processed = 0;
newFrame = independentFrame = false;
- if (Length >= TS_SIZE) {
- if (TsHasPayload(Data) && !TsIsScrambled(Data) && TsPid(Data) == pid) {
- if (TsPayloadStart(Data)) {
- if (!frameDuration) {
- const uchar *Pes = Data + TsPayloadOffset(Data);
- if (PesHasPts(Pes)) {
- int64_t Pts = PesGetPts(Pes);
- if (Pts < lastPts) { // avoid wrapping
- lastPts = 0;
- framesPerPayloadUnit = 0;
+ while (Length >= TS_SIZE) {
+ if (TsHasPayload(Data) && !TsIsScrambled(Data) && TsPid(Data) == pid) {
+ if (TsPayloadStart(Data)) {
+ if (!frameDuration) {
+ // frame duration unknown, so collect a sequenece of PTS values:
+ if (numPtsValues < MaxPtsValues && numIFrames < 2) { // collect a sequence containing at least two I-frames
+ const uchar *Pes = Data + TsPayloadOffset(Data);
+ if (PesHasPts(Pes)) {
+ ptsValues[numPtsValues] = PesGetPts(Pes);
+ // check for rollover:
+ if (numPtsValues && ptsValues[numPtsValues - 1] > 0xF0000000 && ptsValues[numPtsValues] < 0x10000000) {
+ dbgframes("#");
+ numPtsValues = 0;
+ numIFrames = 0;
+ }
+ else
+ numPtsValues++;
+ }
}
- if ((!lastPts || !framesPerPayloadUnit) && Pts != lastPts)
- lastPts = Pts;
else {
- int64_t Delta = Pts - lastPts;
+ // find the smallest PTS delta:
+ qsort(ptsValues, numPtsValues, sizeof(uint32_t), CmpUint32);
+ numPtsValues--;
+ for (int i = 0; i < numPtsValues; i++)
+ ptsValues[i] = ptsValues[i + 1] - ptsValues[i];
+ qsort(ptsValues, numPtsValues, sizeof(uint32_t), CmpUint32);
+ uint32_t Delta = ptsValues[0];
+ // determine frame info:
if (isVideo) {
if (Delta % 3600 == 0)
frameDuration = 3600; // PAL, 25 fps
else if (Delta % 3003 == 0)
frameDuration = 3003; // NTSC, 29.97 fps
+ else if (Delta == 1501) {
+ frameDuration = 3003; // NTSC, 29.97 fps
+ framesPerPayloadUnit = -2;
+ }
else {
frameDuration = 3600; // unknown, assuming 25 fps
- dsyslog("unknown frame duration, assuming 25 fps (PTS: %lld - %lld = %lld FPPU = %d)\n", Pts, lastPts, Delta, framesPerPayloadUnit);
+ dsyslog("unknown frame duration (%d), assuming 25 fps", Delta);
}
}
else // audio
frameDuration = Delta; // PTS of audio frames is always increasing
- dbgframes("PTS: %lld - %lld = %lld -> FD = %d FPS = %5.2f FPPU = %d\n", Pts, lastPts, Delta, frameDuration, 90000.0 / frameDuration, framesPerPayloadUnit);
+ dbgframes("\nframe duration = %d FPS = %5.2f FPPU = %d\n", frameDuration, 90000.0 / frameDuration, framesPerPayloadUnit);
}
}
+ scanner = 0;
+ scanning = true;
}
- scanner = 0;
- scanning = true;
- }
- if (scanning) {
- int PayloadOffset = TsPayloadOffset(Data);
- if (TsPayloadStart(Data))
- PayloadOffset += PesPayloadOffset(Data + PayloadOffset);
- for (int i = PayloadOffset; i < TS_SIZE; i++) {
- scanner <<= 8;
- scanner |= Data[i];
- switch (type) {
- case 0x02: // MPEG 2 video
- if (scanner == 0x00000100) { // Picture Start Code
- if (frameDuration) {
+ if (scanning) {
+ int PayloadOffset = TsPayloadOffset(Data);
+ if (TsPayloadStart(Data)) {
+ PayloadOffset += PesPayloadOffset(Data + PayloadOffset);
+ if (!framesPerPayloadUnit)
+ framesPerPayloadUnit = framesInPayloadUnit;
+ if (DebugFrames && !synced)
+ dbgframes("/");
+ }
+ for (int i = PayloadOffset; scanning && i < TS_SIZE; i++) {
+ scanner <<= 8;
+ scanner |= Data[i];
+ switch (type) {
+ case 0x02: // MPEG 2 video
+ if (scanner == 0x00000100) { // Picture Start Code
+ if (synced && Processed)
+ return Processed;
newFrame = true;
independentFrame = ((Data[i + 2] >> 3) & 0x07) == 1; // I-Frame
- if (framesPerPayloadUnit == 1) {
- scanning = false;
- return TS_SIZE;
+ if (synced) {
+ if (framesPerPayloadUnit <= 1)
+ scanning = false;
}
+ else {
+ framesInPayloadUnit++;
+ if (independentFrame)
+ numIFrames++;
+ dbgframes("%d ", (Data[i + 2] >> 3) & 0x07);
+ }
+ scanner = 0;
}
- else {
- framesPerPayloadUnit++;
- dbgframes("%d ", (Data[i + 2] >> 3) & 0x07);
- }
- scanner = 0;
- }
- break;
- case 0x1B: // MPEG 4 video
- if (scanner == 0x00000109) { // Access Unit Delimiter
- if (frameDuration) {
+ break;
+ case 0x1B: // MPEG 4 video
+ if (scanner == 0x00000109) { // Access Unit Delimiter
+ if (synced && Processed)
+ return Processed;
newFrame = true;
independentFrame = Data[i + 1] == 0x10;
- if (framesPerPayloadUnit == 1) {
- scanning = false;
- return TS_SIZE;
+ if (synced) {
+ if (framesPerPayloadUnit < 0) {
+ payloadUnitOfFrame = (payloadUnitOfFrame + 1) % -framesPerPayloadUnit;
+ if (payloadUnitOfFrame != 0 && independentFrame)
+ payloadUnitOfFrame = 0;
+ if (payloadUnitOfFrame)
+ newFrame = false;
+ }
+ if (framesPerPayloadUnit <= 1)
+ scanning = false;
}
+ else {
+ framesInPayloadUnit++;
+ if (independentFrame)
+ numIFrames++;
+ dbgframes("%02X ", Data[i + 1]);
+ }
+ scanner = 0;
}
- else {
- framesPerPayloadUnit++;
- dbgframes("%02X ", Data[i + 1]);
- }
- scanner = 0;
- }
- break;
- case 0x04: // MPEG audio
- case 0x06: // AC3 audio
- if (frameDuration) {
+ break;
+ case 0x04: // MPEG audio
+ case 0x06: // AC3 audio
+ if (synced && Processed)
+ return Processed;
newFrame = true;
independentFrame = true;
+ if (!synced) {
+ framesInPayloadUnit = 1;
+ if (TsPayloadStart(Data))
+ numIFrames++;
+ }
scanning = false;
- }
- else
- framesPerPayloadUnit = 1;
- break;
- default: esyslog("ERROR: unknown stream type %d (PID %d) in frame detector", type, pid);
- pid = 0; // let's just ignore any further data
+ break;
+ default: esyslog("ERROR: unknown stream type %d (PID %d) in frame detector", type, pid);
+ pid = 0; // let's just ignore any further data
+ }
+ }
+ if (!synced && frameDuration && independentFrame) {
+ synced = true;
+ dbgframes("*");
}
- }
+ }
}
+ Data += TS_SIZE;
+ Length -= TS_SIZE;
+ Processed += TS_SIZE;
}
- return TS_SIZE;
- }
- return 0;
+ return Processed;
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-09-21 03:46:05 +0000