/*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "dsf.h"
int
get_dsf_metadata(PerlIO *infile, char *file, HV *info, HV *tags)
{
Buffer buf;
off_t file_size;
int err = 0;
uint64_t chunk_size, total_size, metadata_offset, sample_count, sample_bytes;
uint32_t format_version, format_id, channel_type, channel_num,
sampling_frequency, block_size_per_channel, bits_per_sample;
unsigned char *bptr;
file_size = _file_size(infile);
buffer_init(&buf, DSF_BLOCK_SIZE);
if ( !_check_buf(infile, &buf, 80, DSF_BLOCK_SIZE) ) {
err = -1;
goto out;
}
if ( !strncmp( (char *)buffer_ptr(&buf), "DSD ", 4 ) ) {
buffer_consume(&buf, 4);
my_hv_store( info, "file_size", newSVuv(file_size) );
chunk_size = buffer_get_int64_le(&buf);
total_size = buffer_get_int64_le(&buf);
metadata_offset = buffer_get_int64_le(&buf);
if ((chunk_size != 28) ||
metadata_offset > total_size) {
PerlIO_printf(PerlIO_stderr(), "Invalid DSF file header: %s\n", file);
err = -1;
goto out;
}
if ( strncmp( (char *)buffer_ptr(&buf), "fmt ", 4 ) ) {
PerlIO_printf(PerlIO_stderr(), "Invalid DSF file: missing fmt header: %s\n", file);
err = -1;
goto out;
}
buffer_consume(&buf, 4);
chunk_size = buffer_get_int64_le(&buf);
format_version = buffer_get_int_le(&buf);
format_id = buffer_get_int_le(&buf);
channel_type = buffer_get_int_le(&buf);
channel_num = buffer_get_int_le(&buf);
sampling_frequency = buffer_get_int_le(&buf);
bits_per_sample = buffer_get_int_le(&buf);
sample_count = buffer_get_int64_le(&buf);
block_size_per_channel = buffer_get_int_le(&buf);
if ( (chunk_size != 52) ||
(format_version != 1) ||
(format_id != 0) ||
(channel_type != 2) ||
(channel_num != 2) ||
(block_size_per_channel != 4096) ||
strncmp( (char *)buffer_ptr(&buf), "\0\0\0\0", 4 ) ) {
PerlIO_printf(PerlIO_stderr(), "Invalid DSF file: unsupported fmt header: %s\n", file);
err = -1;
goto out;
}
buffer_consume(&buf, 4);
if ( strncmp( (char *)buffer_ptr(&buf), "data", 4 ) ) {
PerlIO_printf(PerlIO_stderr(), "Invalid DSF file: missing data header: %s\n", file);
err = -1;
goto out;
}
buffer_consume(&buf, 4);
sample_bytes = buffer_get_int64_le(&buf) - 12;
my_hv_store( info, "audio_offset", newSVuv( 28 + 52 + 12 ) );
my_hv_store( info, "audio_size", newSVuv(sample_bytes) );
my_hv_store( info, "samplerate", newSVuv(sampling_frequency) );
my_hv_store( info, "song_length_ms", newSVuv( (sample_count * 1000.) / sampling_frequency ) );
my_hv_store( info, "channels", newSVuv(channel_num) );
my_hv_store( info, "bits_per_sample", newSVuv(1) );
my_hv_store( info, "block_size_per_channel", newSVuv(block_size_per_channel) );
if (metadata_offset) {
PerlIO_seek(infile, metadata_offset, SEEK_SET);
buffer_clear(&buf);
if ( !_check_buf(infile, &buf, 10, WAV_BLOCK_SIZE) ) {
goto out;
}
bptr = buffer_ptr(&buf);
if (
(bptr[0] == 'I' && bptr[1] == 'D' && bptr[2] == '3') &&
bptr[3] < 0xff && bptr[4] < 0xff &&
bptr[6] < 0x80 && bptr[7] < 0x80 && bptr[8] < 0x80 && bptr[9] < 0x80
) {
parse_id3(infile, file, info, tags, metadata_offset, file_size);
}
}
}
else {
PerlIO_printf(PerlIO_stderr(), "Invalid DSF file: missing DSD header: %s\n", file);
err = -1;
goto out;
}
out:
buffer_free(&buf);
if (err) return err;
return 0;
}