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/***************************************************************************
soundsourcem4a.cpp - mp4/m4a decoder
-------------------
copyright : (C) 2008 by Garth Dahlstrom
email : ironstorm@users.sf.net
***************************************************************************/
/***************************************************************************
* *
* This program 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 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#include <taglib/mp4file.h>
#include <neaacdec.h>
#ifdef __MP4V2__
#include <mp4v2/mp4v2.h>
#else
#include <mp4.h>
#endif
#ifdef __WINDOWS__
#include <io.h>
#include <fcntl.h>
#endif
#include <QtDebug>
#include "soundsourcem4a.h"
#include "m4a/mp4-mixxx.cpp"
namespace Mixxx {
SoundSourceM4A::SoundSourceM4A(QString qFileName)
: SoundSource(qFileName) {
// Initialize variables to invalid values in case loading fails.
mp4file = MP4_INVALID_FILE_HANDLE;
filelength = 0;
memset(&ipd, 0, sizeof(ipd));
}
SoundSourceM4A::~SoundSourceM4A() {
if (ipd.filename) {
delete [] ipd.filename;
ipd.filename = NULL;
}
if (mp4file != MP4_INVALID_FILE_HANDLE) {
mp4_close(&ipd);
mp4file = MP4_INVALID_FILE_HANDLE;
}
}
Result SoundSourceM4A::open()
{
//Initialize the FAAD2 decoder...
initializeDecoder();
//qDebug() << "SSM4A: channels:" << m_iChannels
// << "filelength:" << filelength
// << "Sample Rate:" << m_iSampleRate;
return OK;
}
int SoundSourceM4A::initializeDecoder()
{
// Copy QString to char[] buffer for mp4_open to read from later
QByteArray qbaFileName;
qbaFileName = m_qFilename.toLocal8Bit();
int bytes = qbaFileName.length() + 1;
ipd.filename = new char[bytes];
strncpy(ipd.filename, qbaFileName.constData(), bytes);
ipd.filename[bytes-1] = '\0';
ipd.remote = false; // File is not an stream
// The file was loading and failing erratically because
// ipd.remote was an in an uninitialized state, it needed to be
// set to false.
int mp4_open_status = mp4_open(&ipd);
if (mp4_open_status != 0) {
qWarning() << "SSM4A::initializeDecoder failed"
<< m_qFilename << " with status:" << mp4_open_status;
return ERR;
}
// mp4_open succeeded -> populate variables
mp4_private* mp = (struct mp4_private*)ipd.private_ipd;
Q_ASSERT(mp);
mp4file = mp->mp4.handle;
filelength = mp4_total_samples(&ipd);
m_iSampleRate = mp->sample_rate;
m_iChannels = mp->channels;
return OK;
}
long SoundSourceM4A::seek(long filepos){
// Abort if file did not load.
if (filelength == 0)
return 0;
//qDebug() << "SSM4A::seek()" << filepos;
// qDebug() << "MP4SEEK: seek time:" << filepos / (m_iChannels * m_iSampleRate) ;
int position = mp4_seek_sample(&ipd, filepos);
//int position = mp4_seek(&ipd, filepos / (m_iChannels * m_iSampleRate));
return position;
}
unsigned SoundSourceM4A::read(volatile unsigned long size, const SAMPLE* destination) {
// Abort if file did not load.
if (filelength == 0)
return 0;
//qDebug() << "SSM4A::read()" << size;
// We want to read a total of "size" samples, and the mp4_read()
// function wants to know how many bytes we want to decode. One
// sample is 16-bits = 2 bytes here, so we multiply size by channels to
// get the number of bytes we want to decode.
int total_bytes_to_decode = size * m_iChannels;
int total_bytes_decoded = 0;
int num_bytes_req = 4096;
char* buffer = (char*)destination;
SAMPLE * as_buffer = (SAMPLE*) destination; //pointer for mono->stereo filling.
do {
if (total_bytes_decoded + num_bytes_req > total_bytes_to_decode)
num_bytes_req = total_bytes_to_decode - total_bytes_decoded;
// (char *)&destination[total_bytes_decoded/2],
int numRead = mp4_read(&ipd,
buffer,
num_bytes_req);
if(numRead <= 0) {
//qDebug() << "SSM4A::read: EOF";
break;
}
buffer += numRead;
total_bytes_decoded += numRead;
} while (total_bytes_decoded < total_bytes_to_decode);
// At this point *destination should be filled. If mono : double all samples
// (L => R)
if (m_iChannels == 1) {
for (int i = total_bytes_decoded/2-1; i >= 0; --i) {
// as_buffer[i] is an audio sample (s16)
//scroll through , copying L->R & expanding buffer
as_buffer[i*2+1] = as_buffer[i];
as_buffer[i*2] = as_buffer[i];
}
}
// Tell us about it only if we end up decoding a different value
// then what we expect.
if (total_bytes_decoded % (size * 2)) {
qDebug() << "SSM4A::read : total_bytes_decoded:"
<< total_bytes_decoded
<< "size:"
<< size;
}
//There are two bytes in a 16-bit sample, so divide by 2.
return total_bytes_decoded / 2;
}
inline long unsigned SoundSourceM4A::length(){
return filelength;
//return m_iChannels * mp4_duration(&ipd) * m_iSampleRate;
}
Result SoundSourceM4A::parseHeader(){
setType("m4a");
TagLib::MP4::File f(getFilename().toLocal8Bit().constData());
bool result = processTaglibFile(f);
TagLib::MP4::Tag* tag = f.tag();
if (tag) {
processMP4Tag(tag);
}
if (result)
return OK;
return ERR;
}
QImage SoundSourceM4A::parseCoverArt() {
setType("m4a");
TagLib::MP4::File f(getFilename().toLocal8Bit().constData());
return getCoverInMP4Tag(f.tag());
}
QList<QString> SoundSourceM4A::supportedFileExtensions()
{
QList<QString> list;
list.push_back("m4a");
list.push_back("mp4");
return list;
}
}
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