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k3b/plugins/decoder/ffmpeg/k3bffmpegwrapper.cpp

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/*
*
* $Id: k3bffmpegwrapper.cpp 641819 2007-03-12 17:29:23Z trueg $
* Copyright (C) 2004-2007 Sebastian Trueg <trueg@k3b.org>
*
* This file is part of the K3b project.
* Copyright (C) 1998-2007 Sebastian Trueg <trueg@k3b.org>
*
* 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.
* See the file "COPYING" for the exact licensing terms.
*/
#include <config.h>
#include "k3bffmpegwrapper.h"
extern "C" {
#include <libavcodec/avcodec.h>
#include <libavformat/avformat.h>
}
#include <string.h>
#include <klocale.h>
#if LIBAVFORMAT_BUILD < 4629
#define FFMPEG_BUILD_PRE_4629
#endif
K3bFFMpegWrapper* K3bFFMpegWrapper::s_instance = 0;
class K3bFFMpegFile::Private
{
public:
AVFormatContext* formatContext;
AVCodec* codec;
K3b::Msf length;
// for decoding
char outputBuffer[AVCODEC_MAX_AUDIO_FRAME_SIZE];
char* outputBufferPos;
int outputBufferSize;
AVPacket packet;
Q_UINT8* packetData;
int packetSize;
};
K3bFFMpegFile::K3bFFMpegFile( const QString& filename )
: m_filename(filename)
{
d = new Private;
d->formatContext = 0;
d->codec = 0;
}
K3bFFMpegFile::~K3bFFMpegFile()
{
close();
delete d;
}
bool K3bFFMpegFile::open()
{
close();
// open the file
int err = av_open_input_file( &d->formatContext, m_filename.local8Bit(), 0, 0, 0 );
if( err < 0 ) {
kdDebug() << "(K3bFFMpegFile) unable to open " << m_filename << " with error " << err << endl;
return false;
}
// analyze the streams
av_find_stream_info( d->formatContext );
// we only handle files containing one audio stream
if( d->formatContext->nb_streams != 1 ) {
kdDebug() << "(K3bFFMpegFile) more than one stream in " << m_filename << endl;
return false;
}
// urgh... ugly
#ifdef FFMPEG_BUILD_PRE_4629
AVCodecContext* codecContext = &d->formatContext->streams[0]->codec;
#else
AVCodecContext* codecContext = d->formatContext->streams[0]->codec;
#endif
if( codecContext->codec_type != CODEC_TYPE_AUDIO ) {
kdDebug() << "(K3bFFMpegFile) not a simple audio stream: " << m_filename << endl;
return false;
}
// get the codec
d->codec = avcodec_find_decoder(codecContext->codec_id);
if( !d->codec ) {
kdDebug() << "(K3bFFMpegFile) no codec found for " << m_filename << endl;
return false;
}
// open the codec on our context
kdDebug() << "(K3bFFMpegFile) found codec for " << m_filename << endl;
if( avcodec_open( codecContext, d->codec ) < 0 ) {
kdDebug() << "(K3bFFMpegDecoderFactory) could not open codec." << endl;
return false;
}
// determine the length of the stream
d->length = K3b::Msf::fromSeconds( (double)d->formatContext->duration / (double)AV_TIME_BASE );
if( d->length == 0 ) {
kdDebug() << "(K3bFFMpegDecoderFactory) invalid length." << endl;
return false;
}
// dump some debugging info
dump_format( d->formatContext, 0, m_filename.local8Bit(), 0 );
return true;
}
void K3bFFMpegFile::close()
{
d->outputBufferSize = 0;
d->packetSize = 0;
d->packetData = 0;
if( d->codec ) {
#ifdef FFMPEG_BUILD_PRE_4629
avcodec_close( &d->formatContext->streams[0]->codec );
#else
avcodec_close( d->formatContext->streams[0]->codec );
#endif
d->codec = 0;
}
if( d->formatContext ) {
av_close_input_file( d->formatContext );
d->formatContext = 0;
}
}
K3b::Msf K3bFFMpegFile::length() const
{
return d->length;
}
int K3bFFMpegFile::sampleRate() const
{
#ifdef FFMPEG_BUILD_PRE_4629
return d->formatContext->streams[0]->codec.sample_rate;
#else
return d->formatContext->streams[0]->codec->sample_rate;
#endif
}
int K3bFFMpegFile::channels() const
{
#ifdef FFMPEG_BUILD_PRE_4629
return d->formatContext->streams[0]->codec.channels;
#else
return d->formatContext->streams[0]->codec->channels;
#endif
}
int K3bFFMpegFile::type() const
{
#ifdef FFMPEG_BUILD_PRE_4629
return d->formatContext->streams[0]->codec.codec_id;
#else
return d->formatContext->streams[0]->codec->codec_id;
#endif
}
QString K3bFFMpegFile::typeComment() const
{
switch( type() ) {
case CODEC_ID_WMAV1:
return i18n("Windows Media v1");
case CODEC_ID_WMAV2:
return i18n("Windows Media v2");
case CODEC_ID_MP3:
return i18n("MPEG 1 Layer III");
case CODEC_ID_AAC:
return i18n("Advanced Audio Coding (AAC)");
default:
return QString::fromLocal8Bit( d->codec->name );
}
}
QString K3bFFMpegFile::title() const
{
// FIXME: is this UTF8 or something??
if( d->formatContext->title[0] != '\0' )
return QString::fromLocal8Bit( d->formatContext->title );
else
return QString::null;
}
QString K3bFFMpegFile::author() const
{
// FIXME: is this UTF8 or something??
if( d->formatContext->author[0] != '\0' )
return QString::fromLocal8Bit( d->formatContext->author );
else
return QString::null;
}
QString K3bFFMpegFile::comment() const
{
// FIXME: is this UTF8 or something??
if( d->formatContext->comment[0] != '\0' )
return QString::fromLocal8Bit( d->formatContext->comment );
else
return QString::null;
}
int K3bFFMpegFile::read( char* buf, int bufLen )
{
if( fillOutputBuffer() > 0 ) {
int len = QMIN(bufLen, d->outputBufferSize);
::memcpy( buf, d->outputBufferPos, len );
// TODO: only swap if needed
for( int i = 0; i < len-1; i+=2 ) {
char a = buf[i];
buf[i] = buf[i+1];
buf[i+1] = a;
}
d->outputBufferPos += len;
d->outputBufferSize -= len;
return len;
}
else
return 0;
}
// fill d->packetData with data to decode
int K3bFFMpegFile::readPacket()
{
if( d->packetSize <= 0 ) {
av_init_packet( &d->packet );
if( av_read_frame( d->formatContext, &d->packet ) < 0 ) {
return 0;
}
d->packetSize = d->packet.size;
d->packetData = d->packet.data;
}
return d->packetSize;
}
// decode data in d->packetData and fill d->outputBuffer
int K3bFFMpegFile::fillOutputBuffer()
{
// decode if the output buffer is empty
if( d->outputBufferSize <= 0 ) {
// make sure we have data to decode
if( readPacket() == 0 ) {
return 0;
}
d->outputBufferPos = d->outputBuffer;
#ifdef FFMPEG_BUILD_PRE_4629
int len = avcodec_decode_audio2( &d->formatContext->streams[0]->codec,
#else
int len = avcodec_decode_audio2( d->formatContext->streams[0]->codec,
#endif
(short*)d->outputBuffer, &d->outputBufferSize,
d->packetData, d->packetSize );
d->packetSize -= len;
d->packetData += len;
if( d->packetSize <= 0 )
av_free_packet( &d->packet );
}
// if it is still empty try again
if( d->outputBufferSize <= 0 )
return fillOutputBuffer();
else
return d->outputBufferSize;
}
bool K3bFFMpegFile::seek( const K3b::Msf& msf )
{
d->outputBufferSize = 0;
d->packetSize = 0;
double seconds = (double)msf.totalFrames()/75.0;
Q_UINT64 timestamp = (Q_UINT64)(seconds * (double)AV_TIME_BASE);
// FIXME: do we really need the start_time and why?
#if LIBAVFORMAT_BUILD >= 4619
return ( av_seek_frame( d->formatContext, -1, timestamp + d->formatContext->start_time, 0 ) >= 0 );
#else
return ( av_seek_frame( d->formatContext, -1, timestamp + d->formatContext->start_time ) >= 0 );
#endif
}
K3bFFMpegWrapper::K3bFFMpegWrapper()
{
av_register_all();
}
K3bFFMpegWrapper::~K3bFFMpegWrapper()
{
s_instance = 0;
}
K3bFFMpegWrapper* K3bFFMpegWrapper::instance()
{
if( !s_instance ) {
s_instance = new K3bFFMpegWrapper();
}
return s_instance;
}
K3bFFMpegFile* K3bFFMpegWrapper::open( const QString& filename ) const
{
K3bFFMpegFile* file = new K3bFFMpegFile( filename );
if( file->open() ) {
#ifndef K3B_FFMPEG_ALL_CODECS
//
// only allow tested formats. ffmpeg seems not to be too reliable with every format.
// mp3 being one of them sadly. Most importantly: allow the libsndfile decoder to do
// its thing.
//
if( file->type() == CODEC_ID_WMAV1 ||
file->type() == CODEC_ID_WMAV2 ||
file->type() == CODEC_ID_AAC )
#endif
return file;
}
delete file;
return 0;
}