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read_dat.c
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read_dat.c
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/*
SYNOPSIS
read_dat [-m minimum_track_length] [-p filename-prefix] [-q] [-v verbosity-level] input-device-or-file
DESCRIPTION
read_dat reads data from a DAT in an audio-capable DDS drive
and produces a series of WAV files containing the audio data. It also
produces a series of ".details" files containing information about each
".wav" file, including the date/time from the subcode data.
See http://www.cse.unsw.edu.au/~andrewt/read_dat/ for the latest version
of this program.
See http://www.btinternet.com/~big.bubbles/personal/ade/dat-dds/drives.html
and http://www.zianet.com/jgray/dat/index.html for more information about
audio-capable DDS drives.
OPTIONS
-a --max_nonaudio_tape
Maximum number of consecutive non-audio frames before program exits.
Default is 10.
-A --max_nonaudio_track
Maximum number of consecutive non-audio frames before track closed
Default is 0.
-d --ignore_date_time
Don't start a new track if the date/time jumps.
-m seconds --minimum_track_length seconds
Tracks less than this length will be ignored. The value is a double.
Default is 1.0 seconds.
-M seconds --maximum_track_length seconds
Do not create tracks longer than this number of seconds. The value is a double.
A new track will be started if this limit is reached. Default is 360000.0 seconds.
-n --ignore_program_number
Don't start a new track if the program number changes.
-p filename-prefix --prefix filename-prefix
Create WAV files named filename-prefix0.wav, filename-prefix1.wav ...
Default is ""
-q --quiet
Turn off warnings.
-r seconds --read_n_seconds seconds
Read at most this number of seconds of audio.
Default is 360000.0 seconds.
-s frames --skip_n_frames
Skip n frames on segment change.
Default is 0.
-S frames --seek_n_frames
Skip (seek) oever the first n frames of the tape
Default is 0.
-v verbosity-level --verbose verbosity-level
Print extra information. The higher the level specified the more
information printed. Verbosity-level should be in the range 1..5
-V --version
Print the program version number
EXAMPLE
If /dev/st0 is an audio-capable DDS drive with a DAT inserted
read_dat /dev/st0
should create a series of ".wav" files containing the audio data
from the tape. An accompany series of ".details" files will
also be created.
AUTHOR
Andrew Taylor (andrewt@cse.unsw.edu.au)
with additions by (Torsten Lang, read_dat@torstenlang.de (use read_dat in subject line))
DATE
February 2001
COPYRIGHT
This software is copyright Andrew Taylor (andrewt@cse.unsw.edu.au).
It is released under the GNU General Public License. See the
terms and condions appended at end of this file.
BUGS
sometimes bad data at start of track encoded with 12-bit non-linear encoding (LP mode)
Untested on big-endian machines.
4-channel DATs untested.
Warning messages confusing.
Handling of bogus tracks of a small number of frames poor.
DISCUSSION
See ftp://ftp.informatik.uni-erlangen.de/pub/DATlib/ for a more
comprehensive library for manipulating DAT-tapes and
http://www.hoxnet.com/dat-tools/datlib/ for a version modified for Linux.
No code from DATlib has been incorporated in this program but DATlib
provided invaluable information about the format of DAT tapes.
See http://www.zianet.com/jgray/dat/notes.html for some explanation of
the DAT data format.
I have not had access to a complete specification of the Audio DAT format.
This is what I've been able to infer:
Data on in an audio DAT tape is laid out in 5822 byte frames.
The first 5760 bytes of each frame are used for sound.
The last 62 bytes of the frame, i.e. frame[5760..5821] contain information
about the recording rather than sound.
The sound data on a DAT tape is either encoded as PCM 16-bit little-endian
samples or as 12-bit non-linear samples.
The follow applies only to 2 channel (stereo) tapes - I don't know
how what format is used if there are more channels.
There are three sampling rates used for 16-bit samples: 48khz, 44.1khz
and 32khz.
At 48khz frame[0..5759] contains are 1440 pairs of left & right 16-bit samples
At 44.1khz frame[0..5291] contains are 1323 pairs of left & right 16-bit samples
At 32khz frame[0..3840] contains are 960 pairs of left & right 16-bit samples
12-bit non-linear encoding is used with a 32khz sample-rate and half tape speed -
frame[0..5759] contains 1920 pairs of left & right 12-bit samples
I don't know how the non-linear encoding is done or how it is laid out
within the frame.
frame[5760..5815] is used for an array of 7 regions, each of 8 bytes.
The most significant 4 bits of the first byte in each 8 byte region
specifies the type of information it contains.
frame[5816..5819] contains the "sub-id".
frame[5820..5821] contains the "main-id".
A description of the encoding of the last 62 bytes should go here but
see the functions parse_frame, parse_subcodepack
for an operational description of the format of the last 62 bytes.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
#include <getopt.h>
#include <utime.h>
#include <errno.h>
#include <stdarg.h>
#define FRAME_SIZE 5822
#define DATA_SIZE 5760
#define SOUND_DATA_SIZE_48KHZ DATA_SIZE
#define SOUND_DATA_SIZE_44_1KHZ 5292
#define SOUND_DATA_SIZE_32KHZ_PCM 3840
#define SOUND_DATA_SIZE_32KHZ_NONLINEAR_PACKED DATA_SIZE
#define SOUND_DATA_SIZE_32KHZ_NONLINEAR_UNPACKED 7680
#define PACKS_OFFSET 5760
#define N_PACKS 7
#define PACK_SIZE 8
#define SUBID_OFFSET (PACKS_OFFSET + (N_PACKS*PACK_SIZE))
#define MAINID_OFFSET (SUBID_OFFSET + 4)
#define MAX_FILENAME 8192
#define WAV_HEADER_LENGTH 44
#define CTRL_PRIO 8
#define CTRL_START 4
#define CTRL_SKIP 2
#define CTRL_TOC 1
typedef struct frame_info {
int invalid; // 0 == valid, 1 == invalid fields, 2 = non-audio
int nChannels;
int sampling_frequency;
int encoding;
int emphasis;
time_t date_time;
int program_number;
int hex_pno;
int interpolate_flags;
int frame_number;
} frame_info_t;
void usage(void);
void process_file(char *filename);
void parse_frame(unsigned char *frame, frame_info_t *info);
int process_frame(unsigned char *frame, frame_info_t *previous_info, frame_info_t *info);
void parse_subcodepack(unsigned char *frame, int pack_index, frame_info_t *next_info);
void write_frame_audio(unsigned char *frame, frame_info_t *info);
void write_frame_nonlinear_audio(unsigned char *frame, frame_info_t *info);
void open_track(frame_info_t *info);
void close_track();
void write_track_details();
void print_frame_time(int frame_number, FILE *fp);
void warn(char *);
void die(char *format, ...);
int dp(int level, char *format, ...);
char *get_16bit_WAV_header(int samples, int channels, int frequency);
void intcpy(char *b, int i);
void shortcpy(char *b, int i);
int unBCD(unsigned int i);
char *decode_sampfreq[] = {"48kHz","44.1kHz","32kHz","reserved"};
char *decode_numchans[] = {"2 channels","4 channels","reserved","reserved"};
char *decode_quantization[] = {"16-bit linear","12-bit non-linear","reserved","reserved"};
char *decode_emphasis[] = {"none", "pre-emphasis"};
char *decode_subcodeid[] = {"Unused", "Program time","Absolute time","Running Time","Table of Contents","Date","Catalog","Catalog Number","International Standard Recording Code","Pro Binary"};
char *decode_weekday[] = {"Sun", "Mon","Tue","Wed","Thu","Fri","Sat"};
extern short decode_lp_sample[];
extern short translate_lp_frame_index[];
extern short decode_lp_sample[4096];
static int option_print_warnings = 1;
static int option_segment_on_datetime = 1;
static int option_segment_on_program_number = 1;
static int skip_frames_on_segment_change = 0;
static int verbosity = 1;
static FILE *debug_stream;
static off_t seek_n_frames = 0;
static double min_track_seconds = 1.0;
static double max_track_seconds = 360000.0; /* 100 hours should be longer than any track or tape */
static double max_audio_seconds_read = 360000.0;
static int max_consecutive_nonaudio_frames_track = 0;
static int max_consecutive_nonaudio_frames_tape = 10;
static char *filename_prefix = "";
static char *myname;
static char *version = "0.9";
static int little_endian;
static int skip_n_frames = 0;
static double audio_seconds_read = 0;
static int consecutive_nonaudio_frames = 0;
static int track_number = 0;
static int track_frame_count = -1;
static int track_fd = -1;
static FILE *track_invalid_frames_fp = NULL;
char track_filename[MAX_FILENAME];
char track_invalid_frames_filename[MAX_FILENAME];
static int track_nSamples;
static int track_first_frame = -1;
static time_t track_first_date_time = -1;
static int track_first_invalid_frame = -1;
static int track_last_invalid_frame = -1;
static int track_invalid_frames = 0;
static frame_info_t track_info;
static struct option long_options[] = {
{"max_nonaudio_tape", 1, 0, 'a'},
{"max_nonaudio_track", 1, 0, 'a'},
{"ignore_date_time", 0, 0, 'd'},
{"minimum_track_length", 1, 0, 'm'},
{"maximum_track_length", 1, 0, 'M'},
{"ignore_program_number", 0, 0, 'n'},
{"prefix", 1, 0, 'p'},
{"quiet", 0, 0, 'q'},
{"read_n_seconds", 1, 0, 'r'},
{"skip_n_frames", 1, 0, 's'},
{"seek_n_frames", 1, 0, 'S'},
{"verbose", 1, 0, 'v'},
{"version", 0, 0, 'V'},
{0, 0, 0, 0}
};
void
usage(void) {
fprintf(stderr, "Usage: %s [-a frame_count] [-A frame_count] [-d] [-m minimum_track_length] [-M maximum_track_length] [-n] [-p filename-prefix] [-r tape_seconds] [-s frames] [-S frames] [-q] [-v verbosity-level] input-device-or-file\n", myname);
exit(1);
}
int
main(int argc, char *argv[]) {
int n;
myname = strrchr(argv[0], '/');
if (myname == NULL)
myname = argv[0];
else
myname++;
n = 1;
little_endian = (*(char *)&n == 1);
if (!little_endian) {
int i;
for (i = 0; i < sizeof(decode_lp_sample)>>1; i++)
decode_lp_sample[i] = (short)((unsigned char)(decode_lp_sample[i] >> 8) | (decode_lp_sample[i] << 8));
}
while (1) {
int option_index;
int c = getopt_long (argc, argv, "a:A:dm:M:np:qr:s:S:v:V", long_options, &option_index);
if (c == -1)
break;
switch (c) {
case 'a':
max_consecutive_nonaudio_frames_tape = atoi(optarg);
break;
case 'A':
max_consecutive_nonaudio_frames_track = atoi(optarg);
if (max_consecutive_nonaudio_frames_tape < max_consecutive_nonaudio_frames_track)
max_consecutive_nonaudio_frames_tape = max_consecutive_nonaudio_frames_track;
break;
case 'd':
option_segment_on_datetime = 0;
break;
case 'm':
min_track_seconds = atof(optarg);
break;
case 'M':
max_track_seconds = atof(optarg);
break;
case 'n':
option_segment_on_program_number = 0;
break;
case 'p':
filename_prefix = optarg;
break;
case 'q':
option_print_warnings = 0;
verbosity = 0;
break;
case 'r':
max_audio_seconds_read = atof(optarg);
break;
case 's':
skip_frames_on_segment_change = atoi(optarg);
if (skip_frames_on_segment_change < 0)
usage();
break;
case 'S':
seek_n_frames = atoi(optarg);
if (seek_n_frames < 0)
usage();
break;
case 'v':
verbosity = atoi(optarg);
break;
case 'V':
printf("%s v%s - see http://www.cse.unsw.edu.au/~andrewt/read_dat/\n",myname, version);
break;
default:
usage();
}
}
if (optind == argc)
usage();
for (;optind < argc;optind++) {
process_file(argv[optind]);
}
return 0;
}
void
process_file(char *filename) {
int fd, n;
unsigned char buffer[FRAME_SIZE], next_buffer[FRAME_SIZE];
frame_info_t info, next_info;
int frame_number = 0;
if ((fd = open(filename, O_RDONLY)) < 0)
die("Can not open input");
if (seek_n_frames) {
dp(1, "Seeking %d frames\n", (int)seek_n_frames);
off_t seek_bytes = seek_n_frames*FRAME_SIZE;
off_t seek_result = lseek(fd, seek_bytes, SEEK_SET);
if (seek_result == seek_bytes) {
dp(2, "Seek succeeded\n");
frame_number = seek_n_frames;
} else if (seek_result <= 0) {
dp(1, "Seeking not possible reading %d frames\n", (int)seek_n_frames);
for (;frame_number < seek_n_frames;frame_number++) {
if (read(fd, buffer, FRAME_SIZE) != FRAME_SIZE)
die("read failed");
}
} else
die("can not recover from partial seek");
}
if ((n = read(fd, buffer, FRAME_SIZE)) != FRAME_SIZE)
die("read of first frame failed");
info.frame_number = frame_number++;
parse_frame(buffer, &info);
for (;;frame_number++) {
if ((n = read(fd, next_buffer, FRAME_SIZE)) != FRAME_SIZE) {
switch (n) {
case -1:
close_track();
die("read failed");
case 0:
process_frame(buffer, &info, &info);// hack to handle last frame
close_track();
exit(0);
default:
close_track();
die("read returned only a partial frame (%d bytes) - %d frames previously read", n, frame_number);
}
break;
}
next_info.frame_number = frame_number;
parse_frame(next_buffer, &next_info);
if (next_info.hex_pno == 0xbb && frame_number < 4) {
// hack so we number frames from first non lead in frame
frame_number = -1;
next_info.frame_number = -1;
}
if (!process_frame(buffer, &info, &next_info))
return;
memcpy(buffer, next_buffer, sizeof buffer);
info = next_info;
}
}
/*
* process one frame (5822 bytes) of data,
* return 0 if no more input should be read
*/
void
parse_frame(unsigned char *frame, frame_info_t *info) {
unsigned char *scode = frame+DATA_SIZE;
unsigned char *subid = scode+7*8;
unsigned char *mainid = subid+4;
int channels = (mainid[0] >> 0) & 0x3;
int samplerate = (mainid[0] >> 2) & 0x3;
int emphasis = (mainid[0] >> 4) & 0x3;
int fmtid = (mainid[0] >> 6) & 0x3;
int datapacket = (mainid[1] >> 0) & 0x3;
int scms = (mainid[1] >> 2) & 0x3;
int width = (mainid[1] >> 4) & 0x3;
int encoding = (mainid[1] >> 6) & 0x3;
int dataid = (subid[0] >> 0) & 0xf;
int ctrlid = (subid[0] >> 4) & 0xf;
int numpacks = (subid[1] >> 0) & 0xf;
int pno1 = (subid[1] >> 4) & 0xf;
int pno2 = (subid[2] >> 4) & 0xf;
int pno3 = (subid[2] >> 0) & 0xf;
int interpolate_flags = subid[3];
int hex_pno = (pno1 << 8) | (pno2 << 4) | (pno3 << 0);
int bcd_pno = pno1 * 100 + pno2 * 10 + pno3 * 1;
int pack_index;
info->invalid = 0;
info->program_number = -1;
info->date_time = -1;
info->nChannels = 2;
info->sampling_frequency = 48000;
info->hex_pno = hex_pno;
info->interpolate_flags = interpolate_flags;
if (dataid) {
dp(5, "Frame %d non audio dataid(%d)\n", info->frame_number, dataid);
info->invalid = 2;
return;
}
if ((ctrlid != 0 && verbosity >= 3) || verbosity >= 4)
printf("Frame %d cntrlid=%d channels=%d samplerate=%d emphasis=%d fmtid=%d datapacket=%d scms=%d width=%d encoding=%d numpacks=%d id=%x pno=%x%x%x\n", info->frame_number, ctrlid, channels, samplerate, emphasis, fmtid, datapacket, scms, width, encoding, numpacks, subid[0], pno1,pno2, pno3);
if (verbosity >= 4) {
short *s;
int i;
printf("Frame %d data:", info->frame_number);
s = (short *)&frame[0];
for (i = 0; i < 10; i+=2)
printf(" %4d", s[i]);
printf(" ....");
s = (short *)&frame[DATA_SIZE-60];
for (i = 0; i < 10; i+=2)
printf(" %4d", s[i]);
printf("\n");
}
/* check for start id */
if ((ctrlid & CTRL_START) && (ctrlid & CTRL_PRIO) && pno1 < 10 && pno2 < 10 && pno3 < 10)
info->program_number = bcd_pno;
for (pack_index = 0; pack_index < N_PACKS; pack_index++)
parse_subcodepack(frame, pack_index, info);
switch (channels) {
case 0:
info->nChannels = 2;
break;
case 1:
info->nChannels = 4;
break;
default:
info->invalid = 1;
dp(1, "Frame %d invalid value for channels(%d)\n", info->frame_number, channels);
}
switch (samplerate) {
case 0:
info->sampling_frequency = 48000;
break;
case 1:
info->sampling_frequency = 44100;
break;
case 2:
info->sampling_frequency = 32000;
break;
default:
dp(1, "Frame %d invalid value for sampling_frequency (%d)\n", info->frame_number, samplerate);
info->invalid = 1;
}
}
char *
frame_info_inconsistent(frame_info_t *i1, frame_info_t *i2) {
if (option_segment_on_datetime && i1->date_time != -1 && i2->date_time != -1 && i1->date_time != i2->date_time && i1->date_time != i2->date_time + 1 && i1->date_time != i2->date_time - 1)
return "jump in subcode date/time";
else if (i1->nChannels != i1->nChannels)
return "change in number of channels";
else if (i1->sampling_frequency != i2->sampling_frequency)
return "change in sampling frequency";
else if (option_segment_on_program_number && i1->program_number != -1 && i2->program_number != -1 && i1->program_number != i2->program_number)
return "change in program number";
else if (i1->encoding != i2->encoding)
return "change in encoding";
else if (i1->emphasis != i2->emphasis)
return "change in emphasis";
else
return NULL;
}
/*
* process one frame (5822 bytes) of data,
* return 0 if no more input should be read
*
* this function should never skip a frame in the middle of a track
* if their problems with a frame they can either be ignored
* or the track closed and the frame skipped
*/
int
process_frame(unsigned char *frame, frame_info_t *info, frame_info_t *next_info) {
int invalid_frame = info->invalid != 0;
if (info->hex_pno == 0x0ee) {
dp(2, "Frame %d end of tape reached (0x0EE pno found)\n", info->frame_number);
close_track();
return 0;
} else if (info->hex_pno == 0x0bb) {
if (track_fd != -1) {
close_track();
dp(1, "Frame %d closing track 0x0BB pno seen\n", info->frame_number);
} else {
dp(2, "Ignoring frame %d - 0x0BB pno\n", info->frame_number);
}
return 1;
}
if (info->invalid != 2)
consecutive_nonaudio_frames = 0;
else {
if (consecutive_nonaudio_frames++ >= max_consecutive_nonaudio_frames_tape) {
close_track();
dp(1, "Exiting because because %d consecutive frames of non-audio data encountered\n", consecutive_nonaudio_frames);
return 0;
} else {
if (track_fd == -1) {
dp(1, "Skipping frame %d because of non-audio dataid and not in track\n", info->frame_number);
return 1;
}
if (next_info->invalid != 2 && !frame_info_inconsistent(&track_info, next_info)) {
dp(1, "Frame %d ignoring non audio dataid because next frame is audio and its frame info is consistent with previous frame\n", info->frame_number);
} else if (consecutive_nonaudio_frames >= max_consecutive_nonaudio_frames_track) {
dp(1, "Skipping frame %d because of non-audio dataid\n", info->frame_number);
dp(1, "Closing track %d because %d frames of non-audio data encountered\n", track_number, consecutive_nonaudio_frames);
close_track();
} else {
dp(1, "Ignoring non audio dataid on frame %d\n", info->frame_number);
}
}
}
if (info->interpolate_flags & (0x40|0x20)) {
dp(2, "Frame %d warning interpolate flags set indicating audio contains errors\n", info->frame_number);
invalid_frame = 1;
}
if (track_fd != -1) {
char *reason = frame_info_inconsistent(&track_info, info);
if (reason != NULL && !frame_info_inconsistent(&track_info, next_info)) {
dp(1, "Frame %d ignoring %s because previous & next frame consistent\n", info->frame_number, reason);
info->nChannels = next_info->nChannels;
info->sampling_frequency = next_info->sampling_frequency;
info->encoding = next_info->encoding;
info->emphasis = next_info->emphasis;
info->program_number = next_info->program_number;
info->date_time = next_info->date_time;
invalid_frame = 1;
reason = NULL;
}
if (reason != NULL) {
close_track();
skip_n_frames = skip_frames_on_segment_change;
dp(2, "Closing track %d because %s\n", track_number, reason);
}
}
if (skip_n_frames > 0) {
skip_n_frames--;
return 1;
}
if (track_fd == -1)
open_track(info);
if (track_first_frame == -1)
track_first_frame = info->frame_number;
track_info.frame_number = info->frame_number;
if (info->date_time != -1) {
track_info.date_time = info->date_time;
if (track_first_date_time == -1)
track_first_date_time = info->date_time;
}
if (info->program_number != -1 && track_info.program_number == -1)
track_info.program_number = info->program_number;
if (invalid_frame) {
track_invalid_frames++;
if (track_first_invalid_frame == -1)
track_first_invalid_frame = info->frame_number;
track_last_invalid_frame = info->frame_number;
} else if (track_first_invalid_frame != -1) {
if (track_first_invalid_frame == track_last_invalid_frame)
fprintf(track_invalid_frames_fp, "Frame %d (", track_first_invalid_frame);
else
fprintf(track_invalid_frames_fp, "Frames %d-%d (", track_first_invalid_frame, track_last_invalid_frame);
print_frame_time(track_first_invalid_frame, track_invalid_frames_fp);
fprintf(track_invalid_frames_fp, "-");
print_frame_time(track_last_invalid_frame+1, track_invalid_frames_fp);
fprintf(track_invalid_frames_fp, ") invalid\n");
track_first_invalid_frame = -1;
track_last_invalid_frame = -1;
}
write_frame_audio(frame, info);
if (audio_seconds_read >= max_audio_seconds_read) {
dp(1, "Closing track %d and exiting, limit of %.2f seconds reached\n", track_number, max_audio_seconds_read);
close_track();
return 0;
}
if (track_nSamples/(double)info->sampling_frequency >= max_track_seconds) {
dp(1, "Closing track %d and exiting, limit of %.2f seconds reached\n", track_number, max_track_seconds);
close_track();
}
return 1;
}
/*
* process one subcode pack (8 bytes of data)
*/
void
parse_subcodepack(unsigned char *frame, int pack_index, frame_info_t *info) {
struct tm t;
int j, weekday;
int parity = 0;
unsigned char *pack = frame + PACKS_OFFSET + pack_index * PACK_SIZE;
int id = (pack[0] >> 4) & 0x0f;
if (id == 0)
return;
for (j=0; j < 7; j++)
parity ^= pack[j];
if (parity != pack[7]) {
dp(2, "Frame %d Subcode[%d] %s: Incorrect parity %x != %x\n", info->frame_number, pack_index, decode_subcodeid[id], parity, pack[7]);
return;
}
switch (id) {
case 1:
case 2:
case 3:
if ((pack[3] != 0xAA && verbosity > 3) || verbosity > 4)
printf("Frame %d Subcode[%d] %s: indexnr=%d %d:%d:%d frame=%d\n", info->frame_number, pack_index, decode_subcodeid[id], unBCD(pack[2]), unBCD(pack[3]), unBCD(pack[4]), unBCD(pack[5]), unBCD(pack[6]));
break;
case 5:
weekday = pack[0]&0xf;
if (weekday > 7) {
dp(4, "Frame %d Subcode[%d] %s: invalid date\n", info->frame_number, pack_index, decode_subcodeid[id]);
break;
}
t.tm_year = unBCD(pack[1]);
if (t.tm_year < 50)
t.tm_year += 100;
t.tm_mon = unBCD(pack[2]) - 1;
t.tm_mday = unBCD(pack[3]);
t.tm_hour = unBCD(pack[4]) - 1; /* maybe be incorrect - but seems necessary for my Sony TCD-D8 */
t.tm_min = unBCD(pack[5]);
t.tm_sec = unBCD(pack[6]);
t.tm_wday = 0;
t.tm_yday = 0;
t.tm_isdst = 0;
if ((info->date_time = mktime(&t)) == (time_t)(-1)) {
dp(1, "Frame %d can not convert time\n");
warn("can not convert time");
break;
}
dp(3, "Frame %d Subcode[%d] %s", info->frame_number, pack_index,ctime(&info->date_time));
if (weekday - 1 != t.tm_wday)
warn("Day of week apparently set incorrectly on recording - using correct day of week");
break;
default:
dp(4, "Frame %d Subcode[%d] %s\n", info->frame_number, pack_index, decode_subcodeid[id]);
}
}
/*
* process the audio data from a signal frame
*/
void
write_frame_audio(unsigned char *frame, frame_info_t *info) {
int n = 0;
if (track_fd == -1)
return;
if (track_info.encoding != 0) {
write_frame_nonlinear_audio(frame, info);
return;
}
switch (track_info.sampling_frequency) {
case 48000:
n = SOUND_DATA_SIZE_48KHZ;
break;
case 44100:
n = SOUND_DATA_SIZE_44_1KHZ;
break;
case 32000:
n = SOUND_DATA_SIZE_32KHZ_PCM;
break;
default:
close_track();
die("internal error invalid track_sampling_frequency in write_frame_audio");
}
if (write(track_fd, frame, n) != n)
die("write");
track_nSamples += n / (2 * track_info.nChannels);
audio_seconds_read += ((double)(n / (2 * track_info.nChannels)))/track_info.sampling_frequency;
return;
}
void
write_frame_nonlinear_audio(unsigned char *frame, frame_info_t *info) {
short buffer[SOUND_DATA_SIZE_32KHZ_NONLINEAR_UNPACKED/2];
int i, j;
j = 0;
for (i = 0; i < SOUND_DATA_SIZE_32KHZ_NONLINEAR_PACKED; i += 3) {
int x0 = frame[translate_lp_frame_index[i]];
int x1 = frame[translate_lp_frame_index[i+1]];
int x2 = frame[translate_lp_frame_index[i+2]];
buffer[j++] = decode_lp_sample[(x0 << 4) | ((x1 >> 4) & 0x0f)];
buffer[j++] = decode_lp_sample[(x2 << 4) | (x1 & 0x0f)];
}
if (write(track_fd, buffer, SOUND_DATA_SIZE_32KHZ_NONLINEAR_UNPACKED) != SOUND_DATA_SIZE_32KHZ_NONLINEAR_UNPACKED)
die("write");
track_nSamples += SOUND_DATA_SIZE_32KHZ_NONLINEAR_UNPACKED / (2 * track_info.nChannels);
audio_seconds_read += ((double)(SOUND_DATA_SIZE_32KHZ_NONLINEAR_UNPACKED / (2 * track_info.nChannels)))/track_info.sampling_frequency;
}
void
create_filename(char *suffix, char *filename) {
if (track_first_date_time > 0) {
struct tm *t = localtime(&track_first_date_time);
if (snprintf(filename, MAX_FILENAME, "%s%4d-%02d-%02d-%02d-%02d-%02d.%s", filename_prefix, t->tm_year+1900, t->tm_mon+1, t->tm_mday, t->tm_hour, t->tm_min, t->tm_sec, suffix) == -1)
die("filename too long");
} else {
if (snprintf(filename, MAX_FILENAME, "%s%d.%s", filename_prefix, track_number, suffix) == -1)
die("filename too long");
}
}
/*
* start a new track
*/
void
open_track(frame_info_t *info) {
if (track_fd != -1)
die("internal error open_track previous track not closed");
track_nSamples = 0;
track_invalid_frames = 0;
track_info = *info;
track_first_frame = info->frame_number;
track_first_date_time = info->date_time;
create_filename("wav", track_filename);
dp(1, "Creating %s\n", track_filename);
if ((track_fd = open(track_filename, O_CREAT|O_WRONLY|O_TRUNC, 0600)) < 0)
die("Can not create file %s", track_filename);
create_filename("invalid_frames", track_invalid_frames_filename);
dp(1, "Creating %s\n", track_invalid_frames_filename);
if ((track_invalid_frames_fp = fopen(track_invalid_frames_filename, "w")) == NULL)
die("Can not create file", track_invalid_frames_filename);
/*
* header will be re-written when track is finished to add correct number of samples
*/
if (write(track_fd, get_16bit_WAV_header(track_nSamples, info->nChannels, info->sampling_frequency), WAV_HEADER_LENGTH) != WAV_HEADER_LENGTH)
die("Can not write to file");
}
void
adjust_creation_time(char *filename) {
struct utimbuf u;
if (track_first_date_time > 0) {
u.actime = track_first_date_time;
u.modtime = track_first_date_time;
utime(filename, &u);
}
}
/*
* finish a track
*/
void
close_track() {
char new_track_filename[MAX_FILENAME];
char new_track_invalid_frames_filename[MAX_FILENAME];
double track_length = track_nSamples/(double)track_info.sampling_frequency;
if (track_fd == -1)
return;
if (track_length < min_track_seconds) {
if (verbosity >= 1) {
if (track_nSamples == 0)
dp(1, "Deleting %s - no data\n", track_filename);
else
dp(1, "Deleting %s because %.2fs long - minimum track length %.2fs\n", track_filename, track_length, min_track_seconds);
}
/*
* This is inefficient but simpler than buffering writes
*/
close(track_fd);
if (unlink(track_filename) < 0)
die("unlink file");
if (track_invalid_frames_fp) {
fclose(track_invalid_frames_fp);
track_invalid_frames_fp = NULL;
}
unlink(track_invalid_frames_filename);
} else {
if (lseek(track_fd, SEEK_SET, 0) < 0)
die("Can not lseek track");
dp(2, "Re-writing header to %s: %d channels of %d samples at %dhz\n", track_filename, track_info.nChannels, track_nSamples, track_info.sampling_frequency);
/*
* Re-write header as we now know how many samples to include
*/
if (write(track_fd, get_16bit_WAV_header(track_nSamples, track_info.nChannels, track_info.sampling_frequency), WAV_HEADER_LENGTH) != WAV_HEADER_LENGTH)
die("Can not write to file");
close(track_fd);
adjust_creation_time(track_filename);
create_filename("wav", new_track_filename);
if (strcmp(track_filename, new_track_filename) != 0) {
dp(1, "Renaming %s to %s\n", track_filename, new_track_filename);
if (rename(track_filename, new_track_filename) != 0)
die("can not rename track filename");
}
write_track_details();
if (track_invalid_frames_fp) {
if (track_first_invalid_frame != -1) {
if (track_first_invalid_frame == track_last_invalid_frame)
fprintf(track_invalid_frames_fp, "Frame %d (", track_first_invalid_frame);
else
fprintf(track_invalid_frames_fp, "Frames %d-%d (", track_first_invalid_frame, track_last_invalid_frame);
print_frame_time(track_first_invalid_frame, track_invalid_frames_fp);
fprintf(track_invalid_frames_fp, "-");
print_frame_time(track_last_invalid_frame+1, track_invalid_frames_fp);
fprintf(track_invalid_frames_fp, ") invalid\n");
track_first_invalid_frame = -1;
track_last_invalid_frame = -1;
}
fclose(track_invalid_frames_fp);
track_invalid_frames_fp = NULL;
if (!track_invalid_frames) {
unlink(track_invalid_frames_filename);
} else {
adjust_creation_time(track_invalid_frames_filename);
create_filename("invalid_frames", new_track_invalid_frames_filename);
if (strcmp(track_invalid_frames_filename, new_track_invalid_frames_filename) != 0) {
dp(1, "Renaming %s to %s\n", track_invalid_frames_filename, new_track_invalid_frames_filename);
if (rename(track_invalid_frames_filename, new_track_invalid_frames_filename) != 0)
die("can not rename track invalid frames filename");
}
}
}
track_number++;
}
track_fd = -1;
track_frame_count = -1;
track_first_date_time = -1;
track_first_invalid_frame = -1;
track_last_invalid_frame = -1;
}
/*
* create a ".details" file for a track
*/
void
write_track_details() {
FILE *details_fp;
char details_filename[MAX_FILENAME];
create_filename("details", details_filename);
dp(1, "Creating %s\n", details_filename);
if ((details_fp = fopen(details_filename, "w")) == NULL)
die("Can not open details file");
fprintf(details_fp, "Sampling frequency: %d\n", track_info.sampling_frequency);
fprintf(details_fp, "Channels: %d\n", track_info.nChannels);
fprintf(details_fp, "Samples: %d\n", track_nSamples);
fprintf(details_fp, "Quantization: %s\n", decode_quantization[track_info.encoding]);
fprintf(details_fp, "Emphasis: %s\n", decode_emphasis[track_info.emphasis]);
if (track_info.program_number < 0)
fprintf(details_fp, "Program_number: --\n");
else if (track_info.program_number != -1)
fprintf(details_fp, "Program_number: %d\n", track_info.program_number);
fprintf(details_fp, "First date: %s", ctime(&track_first_date_time));
fprintf(details_fp, "Last date: %s", ctime(&(track_info.date_time)));
fprintf(details_fp, "First frame: %d\n", track_first_frame);
fprintf(details_fp, "Last frame: %d\n", track_info.frame_number);
fprintf(details_fp, "Invalid frames: %d\n", track_invalid_frames);
fclose(details_fp);
adjust_creation_time(details_filename);
}
void
print_frame_time(int frame_number, FILE *fp) {
int n,hours, minutes;
double seconds;
switch (track_info.sampling_frequency) {
case 48000:
n = SOUND_DATA_SIZE_48KHZ;
break;
case 44100:
n = SOUND_DATA_SIZE_44_1KHZ;
break;
case 32000:
n = SOUND_DATA_SIZE_32KHZ_PCM;
break;
default:
die("internal error invalid track_sampling_frequency in write_frame_audio");
}
seconds = (frame_number-track_first_frame)*((double)(n / (2 * track_info.nChannels)))/track_info.sampling_frequency;
hours = (int)seconds/3600;
seconds -= hours*3600;
minutes = (int)seconds/60;
seconds -= minutes*60;
fprintf(fp, "%d:%02d:%05.3f", hours, minutes, seconds);
}
/*
* convert a BCD-encoded byte to decimal
*/
int
unBCD(unsigned int i) {
return ((i >> 4) & 0x0f) * 10 + (i & 0x0f);
}
/*
* create a suitable header for a WAV file
*/
char *
get_16bit_WAV_header(int samples, int channels, int frequency) {
static char h[44];
int bytesPerSample = 2;
int bitsPerSample = 16;
strcpy(h, "RIFF WAVEfmt ");
intcpy(h + 4, 36 + samples*channels*bytesPerSample);
intcpy(h + 16, 16);
shortcpy(h + 20, 1);
shortcpy(h + 22, channels);
intcpy(h + 24, frequency);
intcpy(h + 28, frequency*channels*bytesPerSample);
shortcpy(h + 32, bytesPerSample);
shortcpy(h + 34, bitsPerSample);