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|
/*****************************************************************
|
| AP4 - Utility to Fix Sample Entries from MPEG-2 to MPEG-4
|
| Copyright 2002-2008 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 <stdio.h>
#include <stdlib.h>
#include "Ap4.h"
/*----------------------------------------------------------------------
| constants
+---------------------------------------------------------------------*/
#define BANNER "MP4 Aac Sample Description Fixer - Version 1.0\n"\
"(Bento4 Version " AP4_VERSION_STRING ")\n"\
"(c) 2002-2008 Axiomatic Systems, LLC"
/*----------------------------------------------------------------------
| PrintUsageAndExit
+---------------------------------------------------------------------*/
static void
PrintUsageAndExit()
{
fprintf(stderr,
BANNER
"\n\nusage: fixaacsampledescription <input> <output>\n");
exit(1);
}
/*----------------------------------------------------------------------
| AP4_AacSampleDescritionFixer
+---------------------------------------------------------------------*/
class AP4_AacSampleDescriptionFixer : public AP4_Processor
{
public:
virtual TrackHandler* CreateTrackHandler(AP4_TrakAtom* trak) {
// find the stsd atom
AP4_StsdAtom* stsd = AP4_DYNAMIC_CAST(AP4_StsdAtom, trak->FindChild("mdia/minf/stbl/stsd"));
// avoid tracks with no stsd atom (should not happen)
if (stsd == NULL) return NULL;
// we only look at the first sample description
AP4_SampleDescription* desc = stsd->GetSampleDescription(0);
AP4_MpegAudioSampleDescription* audio_desc =
AP4_DYNAMIC_CAST(AP4_MpegAudioSampleDescription, desc);
if (audio_desc && audio_desc->GetObjectTypeId()==AP4_OTI_MPEG2_AAC_AUDIO_LC) {
// patch the stsd
AP4_MpegAudioSampleDescription new_audio_desc(AP4_OTI_MPEG4_AUDIO,
audio_desc->GetSampleRate(),
audio_desc->GetSampleSize(),
audio_desc->GetChannelCount(),
&audio_desc->GetDecoderInfo(),
audio_desc->GetBufferSize(),
audio_desc->GetMaxBitrate(),
audio_desc->GetAvgBitrate());
stsd->RemoveChild(stsd->GetChild(AP4_ATOM_TYPE_MP4A));
stsd->AddChild(new_audio_desc.ToAtom());
printf("audio sample description patched\n");
}
return NULL;
}
};
/*----------------------------------------------------------------------
| main
+---------------------------------------------------------------------*/
int
main(int argc, char** argv)
{
if (argc != 3) {
PrintUsageAndExit();
}
// create the input stream
AP4_Result result;
AP4_ByteStream* input = NULL;
result = AP4_FileByteStream::Create(argv[1], AP4_FileByteStream::STREAM_MODE_READ, input);
if (AP4_FAILED(result)) {
fprintf(stderr, "ERROR: cannot open input file (%s) %d\n", argv[1], result);
return 1;
}
// create the output stream
AP4_ByteStream* output = NULL;
result = AP4_FileByteStream::Create(argv[2], AP4_FileByteStream::STREAM_MODE_WRITE, output);
if (AP4_FAILED(result)) {
fprintf(stderr, "ERROR: cannot open output file (%s) %d\n", argv[2], result);
return 1;
}
// create the processor
AP4_Processor* processor = new AP4_AacSampleDescriptionFixer;
result = processor->Process(*input, *output, NULL);
if (AP4_FAILED(result)) {
fprintf(stderr, "ERROR: failed to process the file (%d)\n", result);
}
// cleanup
delete processor;
input->Release();
output->Release();
return 0;
}
|
