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|
/*****************************************************************
|
| AP4 - Sample Source Interface
|
| Copyright 2002-2009 Axiomatic Systems, LLC
|
|
| This file is part of Bento4/AP4 (MP4 Atom Processing Library).
|
| Unless you have obtained Bento4 under a difference license,
| this version of Bento4 is Bento4|GPL.
| Bento4|GPL 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, or (at your option)
| any later version.
|
| Bento4|GPL 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 Bento4|GPL; see the file COPYING. If not, write to the
| Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
| 02111-1307, USA.
|
****************************************************************/
/*----------------------------------------------------------------------
| includes
+---------------------------------------------------------------------*/
#include "Ap4SampleSource.h"
#include "Ap4Track.h"
#include "Ap4SampleDescription.h"
#include "Ap4DataBuffer.h"
/*----------------------------------------------------------------------
| AP4_TrackSampleSource
+---------------------------------------------------------------------*/
AP4_TrackSampleSource::AP4_TrackSampleSource(AP4_Track* track) :
m_Track(track),
m_SampleIndex(0)
{
}
/*----------------------------------------------------------------------
| AP4_TrackSampleSource
+---------------------------------------------------------------------*/
AP4_UI32
AP4_TrackSampleSource::GetTimeScale()
{
return m_Track->GetMediaTimeScale();
}
/*----------------------------------------------------------------------
| AP4_TrackSampleSource::GetDurationMs
+---------------------------------------------------------------------*/
AP4_UI32
AP4_TrackSampleSource::GetDurationMs()
{
return m_Track->GetDurationMs();
}
/*----------------------------------------------------------------------
| AP4_TrackSampleSource::ReadNextSample
+---------------------------------------------------------------------*/
AP4_Result
AP4_TrackSampleSource::ReadNextSample(AP4_Sample& sample, AP4_DataBuffer& buffer, AP4_UI32& track_id)
{
AP4_Result result = m_Track->ReadSample(m_SampleIndex, sample, buffer);
if (AP4_SUCCEEDED(result)) {
++m_SampleIndex;
track_id = m_Track->GetId();
} else {
track_id = 0;
}
return result;
}
/*----------------------------------------------------------------------
| AP4_TrackSampleSource::SeekToTime
+---------------------------------------------------------------------*/
AP4_Result
AP4_TrackSampleSource::SeekToTime(AP4_UI32 time_ms, bool before)
{
AP4_Ordinal sample_index = 0;
AP4_Result result = m_Track->GetSampleIndexForTimeStampMs(time_ms, sample_index);
if (AP4_FAILED(result)) return result;
if (sample_index >= m_Track->GetSampleCount()) return AP4_ERROR_OUT_OF_RANGE;
sample_index = m_Track->GetNearestSyncSampleIndex(sample_index, before);
if (sample_index >= m_Track->GetSampleCount()) return AP4_ERROR_OUT_OF_RANGE;
m_SampleIndex = sample_index;
return AP4_SUCCESS;
}
/*----------------------------------------------------------------------
| AP4_TrackSampleSource::GetSampleDescription
+---------------------------------------------------------------------*/
AP4_SampleDescription*
AP4_TrackSampleSource::GetSampleDescription(AP4_Ordinal indx)
{
return m_Track->GetSampleDescription(indx);
}
|
