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|
/*****************************************************************
|
| AP4 - AAC to MP4 Converter
|
| 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"
#include "Ap4AdtsParser.h"
/*----------------------------------------------------------------------
| constants
+---------------------------------------------------------------------*/
#define BANNER "AAC to MP4 Converter - 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: aac2mp4 <input> <output>\n");
exit(1);
}
/*----------------------------------------------------------------------
| MakeDsi
+---------------------------------------------------------------------*/
static void
MakeDsi(unsigned int sampling_frequency_index, unsigned int channel_configuration, unsigned char* dsi)
{
unsigned int object_type = 2; // AAC LC by default
dsi[0] = (object_type<<3) | (sampling_frequency_index>>1);
dsi[1] = ((sampling_frequency_index&1)<<7) | (channel_configuration<<3);
}
/*----------------------------------------------------------------------
| main
+---------------------------------------------------------------------*/
int
main(int argc, char** argv)
{
AP4_Result result;
if (argc < 3) {
PrintUsageAndExit();
}
// open the input
AP4_ByteStream* input = NULL;
result = AP4_FileByteStream::Create(argv[1], AP4_FileByteStream::STREAM_MODE_READ, input);
if (AP4_FAILED(result)) {
AP4_Debug("ERROR: cannot open input (%s) %d\n", argv[1], result);
return 1;
}
// open the output
AP4_ByteStream* output = NULL;
result = AP4_FileByteStream::Create(argv[2], AP4_FileByteStream::STREAM_MODE_WRITE, output);
if (AP4_FAILED(result)) {
AP4_Debug("ERROR: cannot open output (%s) %d\n", argv[2], result);
return 1;
}
// create a sample table
AP4_SyntheticSampleTable* sample_table = new AP4_SyntheticSampleTable();
// create an ADTS parser
AP4_AdtsParser parser;
bool initialized = false;
unsigned int sample_description_index = 0;
// read from the input, feed, and get AAC frames
AP4_UI32 sample_rate = 0;
AP4_Cardinal sample_count = 0;
bool eos = false;
for(;;) {
// try to get a frame
AP4_AacFrame frame;
result = parser.FindFrame(frame);
if (AP4_SUCCEEDED(result)) {
AP4_Debug("AAC frame [%06d]: size = %d, %d kHz, %d ch\n",
sample_count,
frame.m_Info.m_FrameLength,
frame.m_Info.m_SamplingFrequency,
frame.m_Info.m_ChannelConfiguration);
if (!initialized) {
initialized = true;
// create a sample description for our samples
AP4_DataBuffer dsi;
unsigned char aac_dsi[2];
MakeDsi(frame.m_Info.m_SamplingFrequencyIndex, frame.m_Info.m_ChannelConfiguration, aac_dsi);
dsi.SetData(aac_dsi, 2);
AP4_MpegAudioSampleDescription* sample_description =
new AP4_MpegAudioSampleDescription(
AP4_OTI_MPEG4_AUDIO, // object type
frame.m_Info.m_SamplingFrequency,
16, // sample size
frame.m_Info.m_ChannelConfiguration,
&dsi, // decoder info
6144, // buffer size
128000, // max bitrate
128000); // average bitrate
sample_description_index = sample_table->GetSampleDescriptionCount();
sample_table->AddSampleDescription(sample_description);
sample_rate = frame.m_Info.m_SamplingFrequency;
}
AP4_MemoryByteStream* sample_data = new AP4_MemoryByteStream(frame.m_Info.m_FrameLength);
frame.m_Source->ReadBytes(sample_data->UseData(), frame.m_Info.m_FrameLength);
sample_table->AddSample(*sample_data, 0, frame.m_Info.m_FrameLength, 1024, sample_description_index, 0, 0, true);
sample_data->Release();
sample_count++;
} else if (!eos) {
// read some data and feed the parser
AP4_UI08 input_buffer[4096];
AP4_Size to_read = parser.GetBytesFree();
if (to_read) {
AP4_Size bytes_read = 0;
if (to_read > sizeof(input_buffer)) to_read = sizeof(input_buffer);
result = input->ReadPartial(input_buffer, to_read, bytes_read);
if (AP4_SUCCEEDED(result)) {
AP4_Size to_feed = bytes_read;
result = parser.Feed(input_buffer, &to_feed);
if (AP4_FAILED(result)) {
AP4_Debug("ERROR: parser.Feed() failed (%d)\n", result);
return 1;
}
} else {
if (result == AP4_ERROR_EOS) {
eos = true;
parser.Feed(NULL, 0, true);
}
}
}
} else {
break;
}
}
// create a movie
AP4_Movie* movie = new AP4_Movie();
// create an audio track
AP4_Track* track = new AP4_Track(AP4_Track::TYPE_AUDIO,
sample_table,
0, // track id
sample_rate, // movie time scale
sample_count*1024, // track duration
sample_rate, // media time scale
sample_count*1024, // media duration
"eng", // language
0, 0); // width, height
// add the track to the movie
movie->AddTrack(track);
// create a multimedia file
AP4_File* file = new AP4_File(movie);
// set the file type
AP4_UI32 compatible_brands[2] = {
AP4_FILE_BRAND_ISOM,
AP4_FILE_BRAND_MP42
};
file->SetFileType(AP4_FILE_BRAND_M4A_, 0, compatible_brands, 2);
// write the file to the output
AP4_FileWriter::Write(*file, *output);
delete file;
input->Release();
output->Release();
return 0;
}
|
