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FlacEncoder.cpp    345 lines (288 with data), 10.7 kB

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/*************************************************************************
FlacEncoder.cpp - encoder for FLAC data
-------------------
begin : Tue Feb 28 2004
copyright : (C) 2004 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. *
* *
***************************************************************************/
#include "config.h"
#include <math.h>
#include <stdlib.h>
#include <time.h>
#include <QByteArray>
#include <QList>
#include <QVarLengthArray>
#include <klocale.h>
#include <kmimetype.h>
#include <kapplication.h>
#include <kglobal.h>
#include <vorbis/vorbisenc.h>
#include "libkwave/FileInfo.h"
#include "libkwave/MetaDataList.h"
#include "libkwave/MessageBox.h"
#include "libkwave/MultiTrackReader.h"
#include "libkwave/Sample.h"
#include "libkwave/SampleReader.h"
#include "FlacCodecPlugin.h"
#include "FlacEncoder.h"
/***************************************************************************/
FlacEncoder::FlacEncoder()
:Encoder(), FLAC::Encoder::Stream(), m_vorbis_comment_map(), m_dst(0)
{
LOAD_MIME_TYPES;
}
/***************************************************************************/
FlacEncoder::~FlacEncoder()
{
}
/***************************************************************************/
Encoder *FlacEncoder::instance()
{
return new FlacEncoder();
}
/***************************************************************************/
QList<FileProperty> FlacEncoder::supportedProperties()
{
return m_vorbis_comment_map.values();
}
/***************************************************************************/
#if defined(FLAC_API_VERSION_1_1_2)
::FLAC__StreamEncoderWriteStatus FlacEncoder::write_callback(
const FLAC__byte buffer[], unsigned int bytes,
unsigned int /* samples */, unsigned int /* current_frame */)
#else
::FLAC__StreamEncoderWriteStatus FlacEncoder::write_callback(
const FLAC__byte buffer[], size_t bytes,
unsigned /* samples */, unsigned /* current_frame */)
#endif
{
Q_ASSERT(m_dst);
if (!m_dst) return FLAC__STREAM_ENCODER_WRITE_STATUS_FATAL_ERROR;
qint64 written = m_dst->write(
reinterpret_cast<const char *>(&(buffer[0])),
static_cast<qint64>(bytes)
);
return (written == static_cast<qint64>(bytes)) ?
FLAC__STREAM_ENCODER_WRITE_STATUS_OK :
FLAC__STREAM_ENCODER_WRITE_STATUS_FATAL_ERROR;
}
/***************************************************************************/
void FlacEncoder::metadata_callback(const ::FLAC__StreamMetadata *)
{
/* we are not interested in the FLAC metadata */
}
/***************************************************************************/
FlacEncoder::VorbisCommentContainer::VorbisCommentContainer()
:m_vc(0)
{
m_vc = FLAC__metadata_object_new(FLAC__METADATA_TYPE_VORBIS_COMMENT);
Q_ASSERT(m_vc);
}
/***************************************************************************/
FlacEncoder::VorbisCommentContainer::~VorbisCommentContainer()
{
if (m_vc) {
// clean up all vorbis comments
}
}
/***************************************************************************/
void FlacEncoder::VorbisCommentContainer::add(const QString &tag,
const QString &value)
{
Q_ASSERT(m_vc);
if (!m_vc) return;
QString s;
s = tag+"="+value;
// make a plain C string out of it, containing UTF-8
QByteArray val = s.toUtf8();
// put it into a vorbis_comment_entry structure
FLAC__StreamMetadata_VorbisComment_Entry entry;
entry.length = val.length(); // in bytes, not characters !
entry.entry = reinterpret_cast<FLAC__byte *>(val.data());
// insert the comment into the list
unsigned int count = m_vc->data.vorbis_comment.num_comments;
bool ok = FLAC__metadata_object_vorbiscomment_insert_comment(
m_vc, count, entry, true);
Q_ASSERT(ok);
Q_UNUSED(ok);
}
/***************************************************************************/
FLAC__StreamMetadata *FlacEncoder::VorbisCommentContainer::data()
{
return m_vc;
}
/***************************************************************************/
void FlacEncoder::encodeMetaData(const FileInfo &info,
QVector<FLAC__StreamMetadata *> &flac_metadata)
{
// encode all Vorbis comments
VorbisCommentMap::ConstIterator it;
VorbisCommentContainer vc;
for (it = m_vorbis_comment_map.constBegin();
it != m_vorbis_comment_map.constEnd();
++it)
{
if (!info.contains(it.value())) continue; // not present -> skip
QString value = info.get(it.value()).toString();
vc.add(it.key(), value);
}
flac_metadata.append(vc.data());
// todo: add cue sheet etc here...
}
/***************************************************************************/
bool FlacEncoder::encode(QWidget *widget, MultiTrackReader &src,
QIODevice &dst,
const Kwave::MetaDataList &meta_data)
{
bool result = true;
qDebug("FlacEncoder::encode()");
const FileInfo info(meta_data);
m_dst = &dst;
// get info: tracks, sample rate
int tracks = info.tracks();
unsigned int bits = info.bits();
unsigned int length = info.length();
#if defined(FLAC_API_VERSION_1_1_3) /* or above */
set_compression_level(5); // @todo make the FLAC compression configurable
#endif
set_channels(static_cast<unsigned>(tracks));
set_bits_per_sample(static_cast<unsigned>(bits));
set_sample_rate(static_cast<unsigned>(info.rate()));
set_total_samples_estimate(static_cast<FLAC__uint64>(length));
set_verify(false); // <- set to "true" for debugging
// use mid-side stereo encoding if we have two channels
set_do_mid_side_stereo(tracks == 2);
set_loose_mid_side_stereo(tracks == 2);
// encode meta data, most of them as vorbis comments
QVector<FLAC__StreamMetadata *> flac_metadata;
encodeMetaData(info, flac_metadata);
// convert container to a list of pointers
unsigned int meta_count = flac_metadata.size();
if (meta_count) {
// WARNING: this only stores the pointer, it does not copy!
if (!set_metadata(flac_metadata.data(), meta_count)) {
qWarning("FlacEncoder: setting meta data failed !?");
}
}
QVector<FLAC__int32 *> flac_buffer;
do {
// open the output device
if (!dst.open(QIODevice::ReadWrite | QIODevice::Truncate)) {
Kwave::MessageBox::error(widget,
i18n("Unable to open the file for saving."));
result = false;
break;
}
// initialize the FLAC stream, this already writes some meta info
#if defined(FLAC_API_VERSION_1_1_3) /* or above */
FLAC__StreamEncoderInitStatus init_state = init();
if (init_state != FLAC__STREAM_ENCODER_INIT_STATUS_OK) {
qWarning("state = %d", static_cast<int>(init_state));
Kwave::MessageBox::error(widget,
i18n("Unable to open the FLAC encoder."));
result = false;
break;
}
#else
FLAC::Encoder::Stream::State init_state = init();
if (init_state != FLAC__STREAM_ENCODER_OK) {
qWarning("state = %s", init_state.as_cstring());
Kwave::MessageBox::error(widget,
i18n("Unable to open the FLAC encoder."));
m_info = 0;
result = false;
break;
}
#endif
// allocate output buffers, with FLAC 32 bit format
unsigned int len = src.blockSize(); // samples
for (int track=0; track < tracks; track++)
{
FLAC__int32 *buffer =
static_cast<FLAC__int32 *>(malloc(sizeof(FLAC__int32) * len));
Q_ASSERT(buffer);
if (!buffer) break;
flac_buffer.append(buffer);
}
// allocate input buffer, with Kwave's sample_t
Kwave::SampleArray in_buffer(len);
Q_ASSERT(in_buffer.size() == len);
Q_ASSERT(flac_buffer.size() == tracks);
if ((in_buffer.size() < len) || (flac_buffer.size() < tracks))
{
Kwave::MessageBox::error(widget, i18n("Out of memory"));
result = false;
break;
}
// calculate divisor for reaching the proper resolution
int shift = SAMPLE_BITS - bits;
if (shift < 0) shift = 0;
FLAC__int32 div = (1 << shift);
if (div == 1) div = 0;
const FLAC__int32 clip_min = -(1 << bits);
const FLAC__int32 clip_max = (1 << bits) - 1;
unsigned int rest = length;
while (rest && len && !src.isCanceled()) {
// limit to rest of signal
if (len > rest) len = rest;
if (in_buffer.size() != len) in_buffer.resize(len);
// add all samples to one single buffer
for (int track=0; track < tracks; track++) {
SampleReader *reader = src[track];
Q_ASSERT(reader);
if (!reader) break;
(*reader) >> in_buffer; // read samples into in_buffer
unsigned int l = in_buffer.size();// in_buffer might be empty!
if (l < len) {
in_buffer.resize(len);
while (l < len) in_buffer[l++] = 0;
}
FLAC__int32 *buf = flac_buffer.at(track);
Q_ASSERT(buf);
if (!buf) break;
for (register unsigned int in_pos=0; in_pos < len; in_pos++) {
register FLAC__int32 s = in_buffer[in_pos];
if (div) s /= div;
if (s > clip_max) s = clip_max;
if (s < clip_min) s = clip_min;
*buf = s;
buf++;
}
}
// process all collected samples
FLAC__int32 **buffer = flac_buffer.data();
bool processed = process(buffer, static_cast<unsigned>(len));
if (!processed) {
result = false;
break;
}
rest -= len;
}
} while (false);
// close the output device and the FLAC stream
finish();
// clean up all FLAC metadata
while (!flac_metadata.isEmpty()) {
FLAC__StreamMetadata *m = flac_metadata[0];
if (m) FLAC__metadata_object_delete(m);
flac_metadata.remove(0);
}
m_dst = 0;
dst.close();
while (!flac_buffer.isEmpty()) {
FLAC__int32 *buf = flac_buffer.first();
if (buf) free(buf);
flac_buffer.remove(0);
}
return result;
}
/***************************************************************************/
/***************************************************************************/