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/*************************************************************************
OpusEncoder.h - sub encoder base class for Opus in an Ogg container
-------------------
begin : Thu Jan 03 2013
copyright : (C) 2013 by Thomas Eschenbacher
email : Thomas.Eschenbacher@gmx.de
***************************************************************************/
/***************************************************************************
* *
* 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. *
* *
***************************************************************************/
#ifndef OPUS_ENCODER_H
#define OPUS_ENCODER_H
#ifdef HAVE_OGG_OPUS
#include "config.h"
#include <ogg/ogg.h>
#include <opus/opus.h>
#include <opus/opus_multistream.h>
#include "libkwave/FileInfo.h"
#include "libkwave/MultiTrackSink.h"
#include "libkwave/VorbisCommentMap.h"
#include "libkwave/modules/SampleBuffer.h"
#include "OggSubEncoder.h"
#include "OpusHeader.h"
class QIODevice;
class QWidget;
namespace Kwave
{
class ChannelMixer;
class FileInfo;
class MultiTrackReader;
class StreamObject;
class OpusEncoder: public Kwave::OggSubEncoder
{
public:
/**
* Constructor
*/
OpusEncoder();
/** Destructor */
~OpusEncoder() override;
/**
* parse the header of the stream and initialize the decoder
* @param widget a QWidget to be used as parent for error messages
* @param info reference to a FileInfo to fill
* @param src MultiTrackReader used as source of the audio data
* @return true if succeeded, false if failed
*/
virtual bool open(QWidget *widget,
const Kwave::FileInfo &info,
Kwave::MultiTrackReader &src) override;
/**
* write the header information
* @param dst a QIODevice that receives the raw data
* @return true if succeeded, false if failed
*/
bool writeHeader(QIODevice &dst) override;
/**
* encode received ogg data
* @param src MultiTrackReader used as source of the audio data
* @param dst a QIODevice that receives the raw data
* @return true if succeeded, false if failed
*/
virtual bool encode(Kwave::MultiTrackReader &src,
QIODevice &dst) override;
/**
* finished the encoding, clean up
*/
void close() override;
private:
/**
* set up the downmixing mode
* @param widget a QWidget to be used as parent for error messages
* @param tracks number of tracks
* @param bitrate in bits/sec or -1 for "auto"
* @return true if succeeded or false if failed/canceled
*/
bool setupDownMix(QWidget *widget, unsigned int tracks, int bitrate);
/**
* determine the bitrate to use for encoding
* @param widget a QWidget to be used as parent for error messages
* @param tracks number of tracks
* @return true if succeeded or false if failed/canceled
*/
bool setupBitrate(QWidget *widget, unsigned int tracks);
/**
* determine the sample rate to use for encoding
* @param widget a QWidget to be used as parent for error messages
* @param tracks number of tracks
* @param rate sample rate of the original in samples/sec
* @return true if succeeded or false if failed/canceled
*/
bool setupCodingRate(QWidget *widget, unsigned int tracks, double rate);
/**
* set up the encoder, including packet size and channel mapping
* @param widget a QWidget to be used as parent for error messages
* @param tracks number of tracks
* @param rate sample rate of the original in samples/sec
* @return true if succeeded or false if failed/canceled
*/
bool setupEncoder(QWidget *widget, unsigned int tracks, double rate);
/**
* set up the bitrate mode, e.g. VBR, CBR etc
* @param widget a QWidget to be used as parent for error messages
* @return true if succeeded or false if failed/canceled
*/
bool setupBitrateMode(QWidget *widget);
/**
* write the Opus header into the Ogg stream
* @param dst a QIODevice that receives the raw data
* @return true if succeeded or false if failed/canceled
*/
bool writeOpusHeader(QIODevice &dst);
/**
* write the Opus tags into the Ogg stream
* @param dst a QIODevice that receives the raw data
* @return true if succeeded or false if failed/canceled
*/
bool writeOpusTags(QIODevice &dst);
/**
* Write the current ogg page to the destination IO device
* @param dst a QIODevice that receives the raw data
* @return true if succeeded or false if failed/canceled
*/
bool writeOggPage(QIODevice &dst);
/**
* Fill the input buffer of the encoder with samples.
* @param src MultiTrackReader used as source of the audio data
* @return number of samples read
*/
unsigned int fillInBuffer(Kwave::MultiTrackReader &src);
private:
/** map for translating Opus comments to Kwave FileInfo */
Kwave::VorbisCommentMap m_comments_map;
/** file info, set in open(...) */
Kwave::FileInfo m_info;
/** take physical pages, weld into a logical stream of packets */
ogg_stream_state m_os;
/** one Ogg bitstream page. Opus packets are inside */
ogg_page m_og;
/** one raw packet of data for decode */
ogg_packet m_op;
/**
* downmix mode: off, automatic, mono or stereo
*/
enum {
DOWNMIX_OFF = -1, /**< no downmixing */
DOWNMIX_AUTO = 0, /**< automatic, based on bitrate */
DOWNMIX_MONO = 1, /**< downmix to mono */
DOWNMIX_STEREO = 2 /**< downmix to stereo */
} m_downmix;
/** bitrate in bits/sec */
int m_bitrate;
/** encoding sample rate in bits/sec */
int m_coding_rate;
/** number of tracks used for encoding, after downmixing */
unsigned int m_encoder_channels;
/** channel mixer (if downmixing is required) */
Kwave::ChannelMixer *m_channel_mixer;
/** sample rate converter (if needed) */
Kwave::StreamObject *m_rate_converter;
/** frame size in samples */
unsigned int m_frame_size;
/** number of samples to pad at the end to compensate preskip */
unsigned int m_extra_out;
/** Opus header, including channel map */
Kwave::opus_header_t m_opus_header;
/** maximum number of bytes per frame */
unsigned int m_max_frame_bytes;
/** buffer for one packet */
unsigned char *m_packet_buffer;
/** the Opus multistream encoder */
OpusMSEncoder *m_encoder;
/** input buffer of the encoder */
float *m_encoder_input;
/**
* end of the queue that possibly consists of a channel mixer (in
* case of downmixing), a rate converter (if needed) and a buffer
* (if one of the two objects mentioned before is present).
*/
Kwave::StreamObject *m_last_queue_element;
/** multi track buffer, for blockwise reading from the source device */
Kwave::MultiTrackSink<Kwave::SampleBuffer, true> *m_buffer;
};
}
#endif /* HAVE_OGG_OPUS */
#endif /* OPUS_ENCODER_H */
//***************************************************************************
//***************************************************************************
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