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/* FileWriter FLAC Plugin
* Copyright (c) 2007 William Pitcock <nenolod@sacredspiral.co.uk>
*
* Partially derived from Og(g)re - Ogg-Output-Plugin:
* Copyright (c) 2002 Lars Siebold <khandha5@gmx.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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "filewriter.h"
#ifdef FILEWRITER_FLAC
#include <FLAC/all.h>
#include <libaudcore/audstrings.h>
static int channels;
static FLAC__StreamEncoder *flac_encoder;
static FLAC__StreamMetadata *flac_metadata;
static FLAC__StreamEncoderWriteStatus flac_write_cb(const FLAC__StreamEncoder *encoder,
const FLAC__byte buffer[], size_t bytes, unsigned samples, unsigned current_frame, void * data)
{
VFSFile *file = (VFSFile *) data;
if (file->fwrite (buffer, 1, bytes) != (int64_t) bytes)
return FLAC__STREAM_ENCODER_WRITE_STATUS_FATAL_ERROR;
return FLAC__STREAM_ENCODER_WRITE_STATUS_OK;
}
static FLAC__StreamEncoderSeekStatus flac_seek_cb(const FLAC__StreamEncoder *encoder,
FLAC__uint64 absolute_byte_offset, void * data)
{
VFSFile *file = (VFSFile *) data;
if (file->fseek (absolute_byte_offset, VFS_SEEK_SET) < 0)
return FLAC__STREAM_ENCODER_SEEK_STATUS_ERROR;
return FLAC__STREAM_ENCODER_SEEK_STATUS_OK;
}
static FLAC__StreamEncoderTellStatus flac_tell_cb(const FLAC__StreamEncoder *encoder,
FLAC__uint64 *absolute_byte_offset, void * data)
{
VFSFile *file = (VFSFile *) data;
*absolute_byte_offset = file->ftell ();
return FLAC__STREAM_ENCODER_TELL_STATUS_OK;
}
static void insert_vorbis_comment (FLAC__StreamMetadata * meta,
const char * name, const Tuple & tuple, Tuple::Field field)
{
Tuple::ValueType type = Tuple::field_get_type (field);
if (tuple.get_value_type (field) != type)
return;
StringBuf temp;
switch (type)
{
case Tuple::Int:
temp = str_printf ("%s=%d", name, tuple.get_int (field));
break;
case Tuple::String:
temp = str_printf ("%s=%s", name, (const char *) tuple.get_str (field));
break;
default:
return;
}
FLAC__StreamMetadata_VorbisComment_Entry comment;
comment.length = temp.len ();
comment.entry = (unsigned char *) (char *) temp;
FLAC__metadata_object_vorbiscomment_insert_comment (meta,
meta->data.vorbis_comment.num_comments, comment, true);
}
static bool flac_open (VFSFile & file, const format_info & info, const Tuple & tuple)
{
flac_encoder = FLAC__stream_encoder_new();
FLAC__stream_encoder_set_channels(flac_encoder, info.channels);
FLAC__stream_encoder_set_sample_rate(flac_encoder, info.frequency);
flac_metadata = FLAC__metadata_object_new(FLAC__METADATA_TYPE_VORBIS_COMMENT);
insert_vorbis_comment (flac_metadata, "TITLE", tuple, Tuple::Title);
insert_vorbis_comment (flac_metadata, "ARTIST", tuple, Tuple::Artist);
insert_vorbis_comment (flac_metadata, "ALBUM", tuple, Tuple::Album);
insert_vorbis_comment (flac_metadata, "GENRE", tuple, Tuple::Genre);
insert_vorbis_comment (flac_metadata, "COMMENT", tuple, Tuple::Comment);
insert_vorbis_comment (flac_metadata, "DATE", tuple, Tuple::Date);
insert_vorbis_comment (flac_metadata, "YEAR", tuple, Tuple::Year);
insert_vorbis_comment (flac_metadata, "TRACKNUMBER", tuple, Tuple::Track);
FLAC__stream_encoder_set_metadata(flac_encoder, &flac_metadata, 1);
FLAC__stream_encoder_init_stream(flac_encoder, flac_write_cb, flac_seek_cb,
flac_tell_cb, nullptr, &file);
channels = info.channels;
return true;
}
static void flac_write (VFSFile & file, const void * data, int length)
{
#if 1
FLAC__int32 *encbuffer[2];
int16_t *tmpdata = (int16_t *) data;
int i;
encbuffer[0] = new FLAC__int32[length / channels];
encbuffer[1] = new FLAC__int32[length / channels];
if (channels == 1)
{
for (i = 0; i < (length / 2); i++)
{
encbuffer[0][i] = tmpdata[i];
encbuffer[1][i] = tmpdata[i];
}
}
else
{
for (i = 0; i < (length / 4); i++)
{
encbuffer[0][i] = tmpdata[2 * i];
encbuffer[1][i] = tmpdata[2 * i + 1];
}
}
FLAC__stream_encoder_process(flac_encoder, (const FLAC__int32 **)encbuffer, length / (channels * 2));
delete[] encbuffer[0];
delete[] encbuffer[1];
#else
FLAC__int32 *encbuffer;
int16_t *tmpdata = (int16_t *) data;
int i;
encbuffer = new FLAC__int32[length];
for (i=0; i < length; i++) {
encbuffer[i] = tmpdata[i];
}
FLAC__stream_encoder_process_interleaved(flac_encoder, encbuffer, length);
delete[] encbuffer;
#endif
}
static void flac_close (VFSFile & file)
{
if (flac_encoder)
{
FLAC__stream_encoder_finish(flac_encoder);
FLAC__stream_encoder_delete(flac_encoder);
flac_encoder = nullptr;
}
if (flac_metadata)
{
FLAC__metadata_object_delete(flac_metadata);
flac_metadata = nullptr;
}
}
static int flac_format_required (int fmt)
{
return FMT_S16_NE;
}
FileWriterImpl flac_plugin = {
nullptr, // init
flac_open,
flac_write,
flac_close,
flac_format_required,
};
#endif
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