Aegisub/core/mkv_wrap.cpp

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// Copyright (c) 2004-2006, Rodrigo Braz Monteiro, Mike Matsnev
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
// * Neither the name of the Aegisub Group nor the names of its contributors
// may be used to endorse or promote products derived from this software
// without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//
// -----------------------------------------------------------------------------
//
// AEGISUB
//
// Website: http://aegisub.cellosoft.com
// Contact: mailto:zeratul@cellosoft.com
//
///////////
// Headers
#include <algorithm>
#include <errno.h>
#include "mkv_wrap.h"
#include "dialog_progress.h"
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////////////
// Instance
MatroskaWrapper MatroskaWrapper::wrapper;
///////////
// Defines
#define CACHESIZE 65536
///////////////
// Constructor
MatroskaWrapper::MatroskaWrapper() {
file = NULL;
}
//////////////
// Destructor
MatroskaWrapper::~MatroskaWrapper() {
Close();
}
/////////////
// Open file
void MatroskaWrapper::Open(wxString filename) {
// Make sure it's closed first
Close();
// Open
char err[2048];
input = new MkvStdIO(filename);
if (input->fp) {
file = mkv_Open(input,err,sizeof(err));
// Failed parsing
if (!file) {
delete input;
throw wxString(_T("MatroskaParser error: ") + wxString(err,wxConvUTF8)).c_str();
}
Parse();
}
// Failed opening
else {
delete input;
throw _T("Unable to open Matroska file for parsing.");
}
}
//////////////
// Close file
void MatroskaWrapper::Close() {
if (file) {
mkv_Close(file);
file = NULL;
fclose(input->fp);
delete input;
}
}
////////////////////
// Return keyframes
wxArrayInt MatroskaWrapper::GetKeyFrames() {
return keyFrames;
}
///////////////////////
// Comparison operator
bool operator < (MkvFrame &t1, MkvFrame &t2) {
return t1.time < t2.time;
}
//////////////////
// Actually parse
void MatroskaWrapper::Parse() {
// Clear keyframes and timecodes
keyFrames.Clear();
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bytePos.Clear();
timecodes.clear();
std::list<MkvFrame> frames;
// Get info
int tracks = mkv_GetNumTracks(file);
TrackInfo *trackInfo;
SegmentInfo *segInfo = mkv_GetFileInfo(file);
// Parse tracks
for (int track=0;track<tracks;track++) {
trackInfo = mkv_GetTrackInfo(file,track);
// Video track
if (trackInfo->Type == 1) {
// Variables
ulonglong startTime, endTime, filePos;
unsigned int rt, frameSize, frameFlags;
CompressedStream *cs = NULL;
// Timecode scale
__int64 timecodeScale = mkv_TruncFloat(trackInfo->TimecodeScale) * segInfo->TimecodeScale;
// Mask other tracks away
mkv_SetTrackMask(file, ~(1 << track));
// Progress bar
int totalTime = double(segInfo->Duration) / timecodeScale;
volatile bool canceled = false;
DialogProgress *progress = new DialogProgress(NULL,_("Parsing Matroska"),&canceled,_("Reading keyframe and timecode data from Matroska file."),0,totalTime);
progress->Show();
progress->SetProgress(0,1);
// Read frames
int frameN = 0;
while (mkv_ReadFrame(file,0,&rt,&startTime,&endTime,&filePos,&frameSize,&frameFlags) == 0) {
// Read value
double curTime = double(startTime) / 1000000.0;
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frames.push_back(MkvFrame((frameFlags & FRAME_KF) != 0,curTime,filePos));
frameN++;
// Cancelled?
if (canceled) {
Close();
throw _T("Canceled");
}
// Update progress
progress->SetProgress(curTime,totalTime);
}
// Clean up progress
if (!canceled) progress->Destroy();
break;
}
}
// Process timecodes and keyframes
frames.sort();
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MkvFrame curFrame(false,0,0);
int i = 0;
for (std::list<MkvFrame>::iterator cur=frames.begin();cur!=frames.end();cur++) {
curFrame = *cur;
if (curFrame.isKey) keyFrames.Add(i);
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bytePos.Add(curFrame.filePos);
timecodes.push_back(curFrame.time);
i++;
}
}
///////////////////////////
// Set target to timecodes
void MatroskaWrapper::SetToTimecodes(FrameRate &target) {
// Enough frames?
int frames = timecodes.size();
if (frames <= 1) return;
// Sort
//std::sort<std::vector<double>::iterator>(timecodes.begin(),timecodes.end());
// Check if it's CFR
bool isCFR = true;
double estimateCFR = timecodes.back() / timecodes.size()-1;
double curTime = 0;
for (int i=0;i<frames;i++) {
int delta = int(curTime - timecodes[i]);
if (abs(delta > 1)) {
isCFR = false;
break;
}
curTime += estimateCFR;
}
// Constant framerate
if (isCFR) {
if (abs(estimateCFR - 23.976) < 0.01) estimateCFR = 23.976;
if (abs(estimateCFR - 29.97) < 0.01) estimateCFR = 29.97;
target.SetCFR(estimateCFR);
}
// Variable framerate
else {
std::vector<int> times;
for (int i=0;i<frames;i++) times.push_back(int(timecodes[i]+0.5));
target.SetVFR(times);
}
}
////////////////////////////// LOTS OF HAALI C CODE DOWN HERE ///////////////////////////////////////
///////////////
// STDIO class
int StdIoRead(InputStream *_st, ulonglong pos, void *buffer, int count) {
MkvStdIO *st = (MkvStdIO *) _st;
size_t rd;
if (fseek(st->fp, pos, SEEK_SET)) {
st->error = errno;
return -1;
}
rd = fread(buffer, 1, count, st->fp);
if (rd == 0) {
if (feof(st->fp))
return 0;
st->error = errno;
return -1;
}
return rd;
}
/* scan for a signature sig(big-endian) starting at file position pos
* return position of the first byte of signature or -1 if error/not found
*/
longlong StdIoScan(InputStream *_st, ulonglong start, unsigned signature) {
MkvStdIO *st = (MkvStdIO *) _st;
int c;
unsigned cmp = 0;
FILE *fp = st->fp;
if (fseek(fp, start, SEEK_SET))
return -1;
while ((c = getc(fp)) != EOF) {
cmp = ((cmp << 8) | c) & 0xffffffff;
if (cmp == signature)
return ftell(fp) - 4;
}
return -1;
}
/* return cache size, this is used to limit readahead */
unsigned StdIoGetCacheSize(InputStream *_st) {
return CACHESIZE;
}
/* return last error message */
const char *StdIoGetLastError(InputStream *_st) {
MkvStdIO *st = (MkvStdIO *) _st;
return strerror(st->error);
}
/* memory allocation, this is done via stdlib */
void *StdIoMalloc(InputStream *_st, size_t size) {
return malloc(size);
}
void *StdIoRealloc(InputStream *_st, void *mem, size_t size) {
return realloc(mem,size);
}
void StdIoFree(InputStream *_st, void *mem) {
free(mem);
}
int StdIoProgress(InputStream *_st, ulonglong cur, ulonglong max) {
return 1;
}
MkvStdIO::MkvStdIO(wxString filename) {
read = StdIoRead;
scan = StdIoScan;
getcachesize = StdIoGetCacheSize;
geterror = StdIoGetLastError;
memalloc = StdIoMalloc;
memrealloc = StdIoRealloc;
memfree = StdIoFree;
progress = StdIoProgress;
fp = fopen(filename.mb_str(),"rb");
if (fp) {
setvbuf(fp, NULL, _IOFBF, CACHESIZE);
}
}