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k3bffmpegwrapper.cpp
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k3bffmpegwrapper.cpp
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/*
SPDX-FileCopyrightText: 1998-2008 Sebastian Trueg <trueg@k3b.org>
SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "k3bffmpegwrapper.h"
#include "k3bplugin_i18n.h"
#include <config-k3b.h>
extern "C" {
/*
Recent versions of FFmpeg uses C99 constant macros which are not present in C++ standard.
The macro __STDC_CONSTANT_MACROS allow C++ to use these macros. Although it's not defined by C++ standard
it's supported by many implementations.
See bug 236036 and discussion: https://lists.ffmpeg.org/pipermail/ffmpeg-devel/2010-May/095488.html
*/
#define __STDC_CONSTANT_MACROS
#ifdef NEWFFMPEGAVCODECPATH
#include <libavcodec/avcodec.h>
#include <libavformat/avformat.h>
#else
#include <ffmpeg/avcodec.h>
#include <ffmpeg/avformat.h>
#endif
}
#include <cstring>
#include <cmath>
#ifndef HAVE_FFMPEG_CODEC_MP3
# define CODEC_ID_MP3 CODEC_ID_MP3LAME
#endif
K3bFFMpegWrapper* K3bFFMpegWrapper::s_instance = nullptr;
class K3bFFMpegFile::Private
{
public:
::AVFormatContext* formatContext;
const ::AVCodec* codec;
::AVCodecContext* codecContext;
::AVStream *audio_stream;
K3b::Msf length;
// for decoding. ffmpeg requires 16-byte alignment.
::AVFrame* frame = nullptr;
::AVPacket* packet = nullptr;
char* outputBufferPos = nullptr;
int outputBufferSize = 0;
::AVSampleFormat sampleFormat;
bool isSpacious;
};
K3bFFMpegFile::K3bFFMpegFile( const QString& filename )
: m_filename(filename)
{
d = new Private;
d->formatContext = nullptr;
d->codec = nullptr;
d->audio_stream = nullptr;
d->frame = av_frame_alloc();
}
K3bFFMpegFile::~K3bFFMpegFile()
{
close();
av_frame_free(&d->frame);
delete d;
}
bool K3bFFMpegFile::open()
{
close();
// open the file
int err = ::avformat_open_input( &d->formatContext, m_filename.toLocal8Bit(), 0, 0 );
if( err < 0 ) {
qDebug() << "(K3bFFMpegFile) unable to open " << m_filename << " with error " << err;
return false;
}
// analyze the streams
::avformat_find_stream_info( d->formatContext, 0 );
// we only handle files containing one audio stream
if( d->formatContext->nb_streams == 1 ) {
d->audio_stream = d->formatContext->streams[0];
} else {
for (uint i = 0; i < d->formatContext->nb_streams; ++i) {
if (d->formatContext->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
if (!d->audio_stream) {
d->audio_stream = d->formatContext->streams[i];
} else {
d->audio_stream = nullptr;
qDebug() << "(K3bFFMpegFile) more than one audio stream in " << m_filename;
return false;
}
}
}
}
// get the codec
d->codec = ::avcodec_find_decoder(
d->audio_stream->codecpar->codec_id
);
if( !d->codec ) {
qDebug() << "(K3bFFMpegFile) no codec found for " << m_filename;
return false;
}
// get the codec context
d->codecContext = ::avcodec_alloc_context3(d->codec);
::avcodec_parameters_to_context(d->codecContext, d->audio_stream->codecpar);
if(d->codecContext->codec_type != AVMEDIA_TYPE_AUDIO) {
qDebug() << "(K3bFFMpegFile) not a simple audio stream: " << m_filename;
return false;
}
// open the codec on our context
qDebug() << "(K3bFFMpegFile) found codec for " << m_filename;
if( ::avcodec_open2( d->codecContext, d->codec, 0 ) < 0 ) {
qDebug() << "(K3bFFMpegDecoderFactory) could not open codec.";
return false;
}
// determine the length of the stream
d->length = K3b::Msf::fromSeconds(
static_cast<double>(d->formatContext->duration) / static_cast<double>(AV_TIME_BASE));
if( d->length == 0 ) {
qDebug() << "(K3bFFMpegDecoderFactory) invalid length.";
return false;
}
d->sampleFormat = d->codecContext->sample_fmt;
#if LIBAVCODEC_VERSION_MAJOR < 61
d->isSpacious = ::av_sample_fmt_is_planar(d->sampleFormat) &&
d->codecContext->channels > 1;
#else
#pragma Unimplemented
d->isSpacious = ::av_sample_fmt_is_planar(d->sampleFormat);
#endif
d->packet = ::av_packet_alloc();
// dump some debugging info
::av_dump_format( d->formatContext, 0, m_filename.toLocal8Bit(), 0 );
return true;
}
void K3bFFMpegFile::close()
{
d->outputBufferSize = 0;
::av_packet_free(&d->packet);
if( d->codec ) {
::avcodec_close(d->codecContext);
d->codec = nullptr;
::avcodec_free_context(&d->codecContext);
d->codecContext = nullptr;
}
if( d->formatContext ) {
::avformat_close_input( &d->formatContext );
d->formatContext = nullptr;
}
d->audio_stream = nullptr;
}
K3b::Msf K3bFFMpegFile::length() const
{
return d->length;
}
int K3bFFMpegFile::sampleRate() const
{
return d->codecContext->sample_rate;
}
int K3bFFMpegFile::channels() const
{
#if LIBAVCODEC_VERSION_MAJOR < 61
return d->codecContext->channels;
#else
#pragma Unimplemented
return 0;
#endif
}
int K3bFFMpegFile::type() const
{
return d->codecContext->codec_id;
}
QString K3bFFMpegFile::typeComment() const
{
switch( type() ) {
case AV_CODEC_ID_WAVPACK:
return i18n("WavPack");
case AV_CODEC_ID_APE:
return i18n("Monkey's Audio (APE)");
case AV_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??
AVDictionaryEntry *ade = av_dict_get( d->formatContext->metadata, "TITLE", nullptr, 0 );
return ade && ade->value && ade->value[0] != '\0' ? QString::fromLocal8Bit( ade->value ) : QString();
}
QString K3bFFMpegFile::author() const
{
// FIXME: is this UTF8 or something??
AVDictionaryEntry *ade = av_dict_get( d->formatContext->metadata, "ARTIST", nullptr, 0 );
return ade && ade->value && ade->value[0] != '\0' ? QString::fromLocal8Bit( ade->value ) : QString();
}
QString K3bFFMpegFile::comment() const
{
// FIXME: is this UTF8 or something??
AVDictionaryEntry *ade = av_dict_get( d->formatContext->metadata, "COMMENT", nullptr, 0 );
return ade && ade->value && ade->value[0] != '\0' ? QString::fromLocal8Bit( ade->value ) : QString();
}
int K3bFFMpegFile::read(char* buf, int bufLen)
{
if (!buf ) {
return -1;
}
if(d->outputBufferSize <= 0)
d->outputBufferPos = new char[bufLen];
int ret = fillOutputBuffer();
if (ret <= 0) {
return ret;
}
int len = qMin(bufLen, ret);
::memcpy(buf, d->outputBufferPos, len);
// TODO: only swap if needed
for(int i = 0; i < len-1; i += 2)
std::swap(buf[i], buf[i+1]); // BE -> LE
d->outputBufferSize -= len;
if(d->outputBufferSize > 0)
d->outputBufferPos += len;
else
delete[] d->outputBufferPos;
return len;
}
int K3bFFMpegFile::readPacket()
{
if( ::av_read_frame( d->formatContext, d->packet ) < 0 ) {
return 0;
}
return d->packet->size;
}
int K3bFFMpegFile::fillOutputBuffer()
{
static int ret = -1;
// decode if the output buffer is empty
while( d->outputBufferSize <= 0 ) {
d->outputBufferSize = 0;
if ( ret >= 0 ) {
ret = ::avcodec_receive_frame( d->codecContext, d->frame );
if ( ret == AVERROR(EAGAIN) || ret == AVERROR_EOF ) {
ret = -1;
continue;
}
else if ( ret < 0 ) {
qDebug() << "(K3bFFMpegFile) decoding failed for " << m_filename;
return -1;
}
int nb_s = d->frame->nb_samples;
const int nb_ch = 2; // copy only 2 channels even if there're more
d->outputBufferSize = nb_s * nb_ch * 2; // 2 means 2 bytes (16bit)
if( d->isSpacious ) {
if( d->sampleFormat == AV_SAMPLE_FMT_FLTP ) {
constexpr int width = sizeof(float); // sample width of float audio
for( int sample = 0; sample < nb_s; sample++ ) {
for( int ch = 0; ch < nb_ch; ch++ ) {
float val = *(reinterpret_cast<float*>(
d->frame->extended_data[ch] + sample * width));
val = ::abs(val) > 1 ? ::copysign(1.0, val) : val;
int16_t result = static_cast<int16_t>(
val * 32767.0 + 32768.5) - 32768;
::memcpy(
d->outputBufferPos + (sample * nb_ch + ch) * 2,
&result,
2 // 2 is sample width of 16 bit audio
);
}
}
} else if ( d->sampleFormat == AV_SAMPLE_FMT_S16P ) {
for(int sample = 0; sample < nb_s; sample++) {
for(int ch = 0; ch < nb_ch; ch++) {
::memcpy(
d->outputBufferPos + (sample * nb_ch + ch) * 2,
d->frame->extended_data[ch] + sample * 2,
2 // 16 bit here as well
);
}
}
} else {
qDebug() << "(K3bFFMpegFile) some planar formats are not supported yet";
return -1;
}
} else {
qDebug() << "(K3bFFMpegFile) non planar and monophonic audio support is not implemented";
return -1;
}
} else {
// make sure we have data to decode
if( readPacket() == 0 ) {
return 0;
}
ret = ::avcodec_send_packet( d->codecContext, d->packet );
if( ret < 0 ) {
qDebug() << "(K3bFFMpegFile) error submitting packet to the decoder";
return -1;
}
continue;
}
}
return d->outputBufferSize;
}
bool K3bFFMpegFile::seek( const K3b::Msf& msf )
{
d->outputBufferSize = 0;
double seconds = (double)msf.totalFrames()/75.0;
quint64 timestamp = (quint64)(seconds * (double)AV_TIME_BASE);
// FIXME: do we really need the start_time and why?
return ( ::av_seek_frame( d->formatContext, -1, timestamp + d->formatContext->start_time, 0 ) >= 0 );
}
K3bFFMpegWrapper::K3bFFMpegWrapper()
{
//::av_register_all();
}
K3bFFMpegWrapper::~K3bFFMpegWrapper()
{
s_instance = nullptr;
}
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() == AV_CODEC_ID_AAC ||
file->type() == AV_CODEC_ID_APE ||
file->type() == AV_CODEC_ID_WAVPACK )
#endif
return file;
}
delete file;
return nullptr;
}