mirror of
https://github.com/cookiengineer/audacity
synced 2025-04-30 23:59:41 +02:00
775 lines
26 KiB
C++
775 lines
26 KiB
C++
#include "assert.h"
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#include "stdlib.h"
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#include "string.h"
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#include "ctype.h"
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#include "trace.h"
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#include <string>
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#include <fstream>
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#include <algorithm>
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#include "strparse.h"
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#include "allegro.h"
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#include "algrd_internal.h"
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using namespace std;
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#define streql(s1, s2) (strcmp(s1, s2) == 0)
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#define field_max 80
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class Alg_reader {
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public:
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istream *file;
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string input_line;
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int line_no;
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String_parse line_parser;
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bool line_parser_flag;
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string field;
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bool error_flag;
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Alg_seq_ptr seq;
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double tsnum;
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double tsden;
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double offset;
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bool offset_found;
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Alg_reader(istream *a_file, Alg_seq_ptr new_seq);
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void readline();
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Alg_parameters_ptr process_attributes(Alg_parameters_ptr attributes,
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double time);
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bool parse();
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long parse_chan(string &field);
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long parse_int(string &field);
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int find_real_in(string &field, int n);
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double parse_real(string &field);
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void parse_error(string &field, long offset, char *message);
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double parse_dur(string &field, double base);
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double parse_after_dur(double dur, string &field, int n, double base);
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double parse_loud(string &field);
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long parse_key(string &field);
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double parse_pitch(string &field);
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long parse_after_key(int key, string &field, int n);
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long find_int_in(string &field, int n);
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bool parse_attribute(string &field, Alg_parameter_ptr parm);
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bool parse_val(Alg_parameter_ptr param, string &s, int i);
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bool check_type(char type_char, Alg_parameter_ptr param);
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};
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double Alg_reader::parse_pitch(string &field)
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{
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if (isdigit(field[1])) {
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int last = find_real_in(field, 1);
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string real_string = field.substr(1, last - 1);
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return atof(real_string.c_str());
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} else {
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return (double) parse_key(field);
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}
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}
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// it is the responsibility of the caller to delete
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// the seq
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Alg_reader::Alg_reader(istream *a_file, Alg_seq_ptr new_seq)
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{
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file = a_file; // save the file
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line_parser_flag = false;
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line_no = 0;
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tsnum = 4; // default time signature
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tsden = 4;
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seq = new_seq;
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offset = 0.0;
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offset_found = false;
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}
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Alg_error alg_read(istream &file, Alg_seq_ptr new_seq, double *offset_ptr)
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// read a sequence from allegro file
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{
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assert(new_seq);
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Alg_reader alg_reader(&file, new_seq);
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bool err = alg_reader.parse();
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if (!err && offset_ptr) {
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*offset_ptr = alg_reader.offset;
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}
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return (err ? alg_error_syntax : alg_no_error);
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}
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void Alg_reader::readline()
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{
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// a word about memory management: this Alg_reader has a
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// member variable input_line that holds a line of input
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// it is reused for each line. input_line is parsed by
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// line_parser, which holds a reference to input_line
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line_parser_flag = false;
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if (getline(*file, input_line)) {
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line_parser.init(&input_line);
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line_parser_flag = true;
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error_flag = false;
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}
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}
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Alg_parameters_ptr Alg_reader::process_attributes(
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Alg_parameters_ptr attributes, double time)
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{
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// print "process_attributes:", attributes
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bool ts_flag = false;
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if (attributes) {
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Alg_parameters_ptr a;
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bool in_seconds = seq->get_units_are_seconds();
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if (a = Alg_parameters::remove_key(&attributes, "tempor")) {
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double tempo = a->parm.r;
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seq->insert_tempo(tempo, seq->get_time_map()->time_to_beat(time));
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}
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if (a = Alg_parameters::remove_key(&attributes, "beatr")) {
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double beat = a->parm.r;
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seq->insert_beat(time, beat);
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}
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if (a = Alg_parameters::remove_key(&attributes, "timesig_numr")) {
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tsnum = a->parm.r;
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ts_flag = true;
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}
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if (a = Alg_parameters::remove_key(&attributes, "timesig_denr")) {
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tsden = a->parm.r;
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ts_flag = true;
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}
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if (ts_flag) {
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seq->set_time_sig(seq->get_time_map()->time_to_beat(time),
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tsnum, tsden);
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}
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if (in_seconds) seq->convert_to_seconds();
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}
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return attributes; // in case it was modified
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}
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bool Alg_reader::parse()
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{
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int voice = 0;
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int key = 60;
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double loud = 100.0;
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double pitch = 60.0;
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double dur = 1.0;
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double time = 0.0;
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int track_num = 0;
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seq->convert_to_seconds();
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//seq->set_real_dur(0.0); // just in case it's not initialized already
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readline();
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bool valid = false; // ignore blank lines
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while (line_parser_flag) {
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bool time_flag = false;
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bool next_flag = false;
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double next;
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bool voice_flag = false;
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bool loud_flag = false;
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bool dur_flag = false;
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bool new_pitch_flag = false; // "P" syntax or "A"-"G" syntax
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double new_pitch = 0.0;
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bool new_key_flag = false; // "K" syntax
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int new_key = 0;
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Alg_parameters_ptr attributes = NULL;
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if (line_parser.peek() == '#') {
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// look for #track
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line_parser.get_nonspace_quoted(field);
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if (streql(field.c_str(), "#track")) {
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line_parser.get_nonspace_quoted(field); // number
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field.insert(0, " "); // need char at beginning because
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// parse_int ignores the first character of the argument
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track_num = parse_int(field);
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seq->add_track(track_num);
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// maybe we have a sequence or track name
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line_parser.get_remainder(field);
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// if there is a non-space character after #track n then
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// use it as sequence or track name. Note that because we
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// skip over spaces, a sequence or track name cannot begin
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// with leading blanks. Another decision is that the name
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// must be at time zero
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if (field.length() > 0) {
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// insert the field as sequence name or track name
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Alg_update_ptr update = new Alg_update;
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update->chan = -1;
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update->time = 0;
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update->set_identifier(-1);
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// sequence name is whatever is on track 0
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// other tracks have track names
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const char *attr =
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(track_num == 0 ? "seqnames" : "tracknames");
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update->parameter.set_attr(
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symbol_table.insert_string(attr));
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update->parameter.s = heapify(field.c_str());
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seq->add_event(update, track_num);
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}
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} else if (streql(field.c_str(), "#offset")) {
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if (offset_found) {
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parse_error(field, 0, "#offset specified twice");
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}
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offset_found = true;
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line_parser.get_nonspace_quoted(field); // number
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field.insert(0, " "); // need char at beginning because
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// parse_real ignores first character in the argument
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offset = parse_real(field);
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}
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} else {
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// we must have a track to insert into
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if (seq->tracks() == 0) seq->add_track(0);
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line_parser.get_nonspace_quoted(field);
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char pk = line_parser.peek();
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// attributes are parsed as two adjacent nonspace_quoted tokens
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// so we have to conditionally call get_nonspace_quoted() again
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if (pk && !isspace(pk)) {
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string field2;
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line_parser.get_nonspace_quoted(field2);
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field.append(field2);
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}
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while (field[0]) {
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char first = toupper(field[0]);
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if (strchr("ABCDEFGKLPUSIQHW-", first)) {
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valid = true; // it's a note or event
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}
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if (first == 'V') {
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if (voice_flag) {
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parse_error(field, 0, "Voice specified twice");
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} else {
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voice = parse_chan(field);
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}
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voice_flag = true;
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} else if (first == 'T') {
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if (time_flag) {
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parse_error(field, 0, "Time specified twice");
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} else {
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time = parse_dur(field, 0.0);
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}
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time_flag = true;
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} else if (first == 'N') {
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if (next_flag) {
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parse_error(field, 0, "Next specified twice");
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} else {
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next = parse_dur(field, time);
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}
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next_flag = true;
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} else if (first == 'K') {
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if (new_key_flag) {
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parse_error(field, 0, "Key specified twice");
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} else {
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new_key = parse_key(field);
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new_key_flag = true;
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}
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} else if (first == 'L') {
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if (loud_flag) {
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parse_error(field, 0, "Loudness specified twice");
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} else {
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loud = parse_loud(field);
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}
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loud_flag = true;
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} else if (first == 'P') {
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if (new_pitch_flag) {
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parse_error(field, 0, "Pitch specified twice");
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} else {
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new_pitch = parse_pitch(field);
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new_pitch_flag = true;
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}
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} else if (first == 'U') {
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if (dur_flag) {
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parse_error(field, 0, "Dur specified twice");
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} else {
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dur = parse_dur(field, time);
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dur_flag = true;
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}
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} else if (strchr("SIQHW", first)) {
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if (dur_flag) {
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parse_error(field, 0, "Dur specified twice");
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} else {
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// prepend 'U' to field, copy EOS too
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field.insert((unsigned int) 0, 1, 'U');
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dur = parse_dur(field, time);
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dur_flag = true;
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}
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} else if (strchr("ABCDEFG", first)) {
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if (new_pitch_flag) {
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parse_error(field, 0, "Pitch specified twice");
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} else {
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// prepend 'P' to field
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field.insert((unsigned int) 0, 1, 'P');
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new_pitch = parse_pitch(field);
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new_pitch_flag = true;
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}
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} else if (first == '-') {
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Alg_parameter parm;
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if (parse_attribute(field, &parm)) { // enter attribute-value pair
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attributes = new Alg_parameters(attributes);
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attributes->parm = parm;
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parm.s = NULL; // protect string from deletion by destructor
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}
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} else {
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parse_error(field, 0, "Unknown field");
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}
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if (error_flag) {
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field[0] = 0; // exit the loop
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} else {
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line_parser.get_nonspace_quoted(field);
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pk = line_parser.peek();
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// attributes are parsed as two adjacent nonspace_quoted
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// tokens so we have to conditionally call
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// get_nonspace_quoted() again
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if (pk && !isspace(pk)) {
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string field2;
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line_parser.get_nonspace_quoted(field2);
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field.append(field2);
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}
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}
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}
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// a case analysis:
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// Key < 128 implies pitch unless pitch is explicitly given
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// Pitch implies Key unless key is explicitly given,
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// Pitch is rounded to nearest integer to determine the Key
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// if necessary, so MIDI files will lose the pitch fraction
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// A-G is a Pitch specification (therefore it implies Key)
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// K60 P60 -- both are specified, use 'em
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// K60 P60 C4 -- overconstrained, an error
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// K60 C4 -- OK, but K60 is already implied by C4
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// K60 -- OK, pitch is 60
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// C4 P60 -- over constrained
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// P60 -- OK, key is 60
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// P60.1 -- OK, key is 60
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// C4 -- OK, key is 60, pitch is 60
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// <nothing> -- OK, key and pitch from before
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// K200 P60 -- ok, pitch is 60
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// K200 with neither P60 nor C4 uses
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// pitch from before
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// figure out what the key/instance is:
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if (new_key_flag) { // it was directly specified
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key = new_key;
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} else if (new_pitch_flag) {
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// pitch was specified, but key was not; get key from pitch
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key = (int) (new_pitch + 0.5); // round to integer key number
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}
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if (new_pitch_flag) {
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pitch = new_pitch;
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} else if (key < 128 && new_key_flag) {
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// no explicit pitch, but key < 128, so it implies pitch
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pitch = key;
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new_pitch_flag = true;
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}
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// now we've acquired new parameters
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// if (it is a note, then enter the note
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if (valid) {
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// change tempo or beat
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attributes = process_attributes(attributes, time);
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// if there's a duration or pitch, make a note:
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if (new_pitch_flag || dur_flag) {
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Alg_note_ptr note_ptr = new Alg_note;
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note_ptr->chan = voice;
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note_ptr->time = time;
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note_ptr->dur = dur;
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note_ptr->set_identifier(key);
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note_ptr->pitch = (float) pitch;
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note_ptr->loud = (float) loud;
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note_ptr->parameters = attributes;
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seq->add_event(note_ptr, track_num); // sort later
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if (seq->get_real_dur() < (time + dur)) seq->set_real_dur(time + dur);
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} else {
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int update_key = -1;
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// key must appear explicitly; otherwise
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// update applies to channel
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if (new_key_flag) {
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update_key = key;
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}
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if (loud_flag) {
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Alg_update_ptr new_upd = new Alg_update;
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new_upd->chan = voice;
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new_upd->time = time;
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new_upd->set_identifier(update_key);
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new_upd->parameter.set_attr(symbol_table.insert_string("loudr"));
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new_upd->parameter.r = pitch;
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seq->add_event(new_upd, track_num);
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if (seq->get_real_dur() < time) seq->set_real_dur(time);
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}
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if (attributes) {
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while (attributes) {
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Alg_update_ptr new_upd = new Alg_update;
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new_upd->chan = voice;
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new_upd->time = time;
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new_upd->set_identifier(update_key);
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new_upd->parameter = attributes->parm;
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seq->add_event(new_upd, track_num);
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Alg_parameters_ptr p = attributes;
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attributes = attributes->next;
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p->parm.s = NULL; // so we don't delete the string
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delete p;
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}
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}
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}
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if (next_flag) {
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time = time + next;
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} else if (dur_flag || new_pitch_flag) { // a note: incr by dur
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time = time + dur;
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}
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}
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}
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readline();
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}
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if (!error_flag) { // why not convert even if there was an error? -RBD
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seq->convert_to_seconds(); // make sure format is correct
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}
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// real_dur is valid, translate to beat_dur
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seq->set_beat_dur((seq->get_time_map())->time_to_beat(seq->get_real_dur()));
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return error_flag;
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}
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long Alg_reader::parse_chan(string &field)
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{
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const char *int_string = field.c_str() + 1;
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char *msg = "Integer or - expected";
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const char *p = int_string;
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char c;
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// check that all chars in int_string are digits or '-':
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while (c = *p++) {
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if (!isdigit(c) && c != '-') {
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parse_error(field, p - field.c_str() - 1, msg);
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return 0;
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}
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}
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p--; // p now points to end-of-string character
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if (p - int_string == 0) {
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// bad: string length is zero
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parse_error(field, 1, msg);
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return 0;
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}
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if (p - int_string == 1 && int_string[0] == '-') {
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// special case: entire string is "-", interpret as -1
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return -1;
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}
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return atoi(int_string);
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}
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long Alg_reader::parse_int(string &field)
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{
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const char *int_string = field.c_str() + 1;
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char *msg = "Integer expected";
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const char *p = int_string;
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char c;
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// check that all chars in int_string are digits:
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while (c = *p++) {
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if (!isdigit(c)) {
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parse_error(field, p - field.c_str() - 1, msg);
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return 0;
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}
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}
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p--; // p now points to end-of-string character
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if (p - int_string == 0) {
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// bad: string length is zero
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parse_error(field, 1, msg);
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return 0;
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}
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return atoi(int_string);
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}
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int Alg_reader::find_real_in(string &field, int n)
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{
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// scans from offset n to the end of a real constant
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bool decimal = false;
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int len = field.length();
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if (n < len && field[n] == '-') n += 1; // parse one minus sign
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for (int i = n; i < len; i++) {
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char c = field[i];
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if (!isdigit(c)) {
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if (c == '.' && !decimal) {
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decimal = true;
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} else {
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return i;
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}
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}
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}
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return len;
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}
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double Alg_reader::parse_real(string &field)
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{
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char *msg = "Real expected";
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int last = find_real_in(field, 1);
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string real_string = field.substr(1, last - 1);
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if (last <= 1 || last < (int) field.length()) {
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parse_error(field, 1, msg);
|
|
return 0;
|
|
}
|
|
return atof(real_string.c_str());
|
|
}
|
|
|
|
|
|
void Alg_reader::parse_error(string &field, long offset, char *message)
|
|
{
|
|
int position = line_parser.pos - field.length() + offset;
|
|
error_flag = true;
|
|
puts(line_parser.str->c_str());
|
|
for (int i = 0; i < position; i++) {
|
|
putc(' ', stdout);
|
|
}
|
|
putc('^', stdout);
|
|
printf(" %s\n", message);
|
|
}
|
|
|
|
|
|
double duration_lookup[] = { 0.25, 0.5, 1.0, 2.0, 4.0 };
|
|
|
|
|
|
double Alg_reader::parse_dur(string &field, double base)
|
|
{
|
|
char *msg = "Duration expected";
|
|
char *durs = "SIQHW";
|
|
char *p;
|
|
int last;
|
|
double dur;
|
|
if (field.length() < 2) {
|
|
// fall through to error message
|
|
return -1;
|
|
} else if (isdigit(field[1])) {
|
|
last = find_real_in(field, 1);
|
|
string real_string = field.substr(1, last - 1);
|
|
dur = atof(real_string.c_str());
|
|
// convert dur from seconds to beats
|
|
dur = seq->get_time_map()->time_to_beat(base + dur) -
|
|
seq->get_time_map()->time_to_beat(base);
|
|
} else if (p = strchr(durs, toupper(field[1]))) {
|
|
dur = duration_lookup[p - durs];
|
|
last = 2;
|
|
} else {
|
|
parse_error(field, 1, msg);
|
|
return 0;
|
|
}
|
|
dur = parse_after_dur(dur, field, last, base);
|
|
dur = seq->get_time_map()->beat_to_time(
|
|
seq->get_time_map()->time_to_beat(base) + dur) - base;
|
|
return dur;
|
|
}
|
|
|
|
|
|
double Alg_reader::parse_after_dur(double dur, string &field,
|
|
int n, double base)
|
|
{
|
|
if ((int) field.length() == n) {
|
|
return dur;
|
|
}
|
|
if (toupper(field[n]) == 'T') {
|
|
return parse_after_dur(dur * 2/3, field, n + 1, base);
|
|
}
|
|
if (field[n] == '.') {
|
|
return parse_after_dur(dur * 1.5, field, n + 1, base);
|
|
}
|
|
if (isdigit(field[n])) {
|
|
int last = find_real_in(field, n);
|
|
string a_string = field.substr(n, last - n);
|
|
double f = atof(a_string.c_str());
|
|
return parse_after_dur(dur * f, field, last, base);
|
|
}
|
|
if (field[n] == '+') {
|
|
string a_string = field.substr(n + 1);
|
|
return dur + parse_dur(
|
|
a_string, seq->get_time_map()->beat_to_time(
|
|
seq->get_time_map()->time_to_beat(base) + dur));
|
|
}
|
|
parse_error(field, n, "Unexpected character in duration");
|
|
return dur;
|
|
}
|
|
|
|
struct loud_lookup_struct {
|
|
char *str;
|
|
int val;
|
|
} loud_lookup[] = { {"FFF", 127}, {"FF", 120}, {"F", 110}, {"MF", 100},
|
|
{"MP", 90}, {"P", 80}, {"PP", 70}, {"PPP", 60},
|
|
{NULL, 0} };
|
|
|
|
|
|
double Alg_reader::parse_loud(string &field)
|
|
{
|
|
char *msg = "Loudness expected";
|
|
if (isdigit(field[1])) {
|
|
return parse_int(field);
|
|
} else {
|
|
string dyn = field.substr(1);
|
|
transform(dyn.begin(), dyn.end(), dyn.begin(), ::toupper);
|
|
for (int i = 0; loud_lookup[i].str; i++) {
|
|
if (streql(loud_lookup[i].str, dyn.c_str())) {
|
|
return (double) loud_lookup[i].val;
|
|
}
|
|
}
|
|
}
|
|
parse_error(field, 1, msg);
|
|
return 100.0;
|
|
}
|
|
|
|
|
|
int key_lookup[] = {21, 23, 12, 14, 16, 17, 19};
|
|
|
|
|
|
// the field can be K<number> or K[A-G]<number> or P[A-G]<number>
|
|
// (this can be called from parse_pitch() to handle [A-G])
|
|
// Notice that the routine ignores the first character: K or P
|
|
//
|
|
long Alg_reader::parse_key(string &field)
|
|
{
|
|
char *msg = "Pitch expected";
|
|
char *pitches = "ABCDEFG";
|
|
char *p;
|
|
if (isdigit(field[1])) {
|
|
// This routine would not have been called if field = "P<number>"
|
|
// so it must be "K<number>" so <number> must be an integer.
|
|
return parse_int(field);
|
|
} else if (p = strchr(pitches, toupper(field[1]))) {
|
|
long key = key_lookup[p - pitches];
|
|
key = parse_after_key(key, field, 2);
|
|
return key;
|
|
}
|
|
parse_error(field, 1, msg);
|
|
return 0;
|
|
}
|
|
|
|
|
|
long Alg_reader::parse_after_key(int key, string &field, int n)
|
|
{
|
|
if ((int) field.length() == n) {
|
|
return key;
|
|
}
|
|
char c = toupper(field[n]);
|
|
if (c == 'S') {
|
|
return parse_after_key(key + 1, field, n + 1);
|
|
}
|
|
if (c == 'F') {
|
|
return parse_after_key(key - 1, field, n + 1);
|
|
}
|
|
if (isdigit(field[n])) {
|
|
int last = find_int_in(field, n);
|
|
string octave = field.substr(n, last - n);
|
|
int oct = atoi(octave.c_str());
|
|
return parse_after_key(key + oct * 12, field, last);
|
|
}
|
|
parse_error(field, n, "Unexpected character in pitch");
|
|
return key;
|
|
}
|
|
|
|
|
|
long Alg_reader::find_int_in(string &field, int n)
|
|
{
|
|
while ((int) field.length() > n && isdigit(field[n])) {
|
|
n = n + 1;
|
|
}
|
|
return n;
|
|
}
|
|
|
|
|
|
bool Alg_reader::parse_attribute(string &field, Alg_parameter_ptr param)
|
|
{
|
|
int i = 1;
|
|
while (i < (int) field.length()) {
|
|
if (field[i] == ':') {
|
|
string attr = field.substr(1, i - 1);
|
|
char type_char = field[i - 1];
|
|
if (strchr("iarsl", type_char)) {
|
|
param->set_attr(symbol_table.insert_string(attr.c_str()));
|
|
parse_val(param, field, i + 1);
|
|
} else {
|
|
parse_error(field, 0, "attribute needs to end with typecode: i,a,r,s, or l");
|
|
}
|
|
return !error_flag;
|
|
}
|
|
i = i + 1;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
|
|
bool Alg_reader::parse_val(Alg_parameter_ptr param, string &s, int i)
|
|
{
|
|
int len = (int) s.length();
|
|
if (i >= len) {
|
|
return false;
|
|
}
|
|
if (s[i] == '"') {
|
|
if (!check_type('s', param)) {
|
|
return false;
|
|
}
|
|
// note: (len - i) includes 2 quote characters but no EOS character
|
|
// so total memory to allocate is (len - i) - 1
|
|
char *r = new char[(len - i) - 1];
|
|
strncpy(r, s.c_str() + i + 1, (len - i) - 2);
|
|
r[(len - i) - 2] = 0; // terminate the string
|
|
param->s = r;
|
|
} else if (s[i] == '\'') {
|
|
if (!check_type('a', param)) {
|
|
return false;
|
|
}
|
|
string r = s.substr(i + 1, len - i - 2);
|
|
param->a = symbol_table.insert_string(r.c_str());
|
|
} else if (param->attr_type() == 'l') {
|
|
if (streql(s.c_str() + i, "true") ||
|
|
streql(s.c_str() + i, "t")) {
|
|
param->l = true;
|
|
} else if (streql(s.c_str() + i, "false") ||
|
|
streql(s.c_str() + i, "nil")) {
|
|
param->l = false;
|
|
} else return false;
|
|
} else if (isdigit(s[i]) || s[i] == '-' || s[i] == '.') {
|
|
int pos = i;
|
|
bool period = false;
|
|
int sign = 1;
|
|
if (s[pos] == '-') {
|
|
sign = -1;
|
|
pos++;
|
|
}
|
|
while (pos < len) {
|
|
if (isdigit(s[pos])) {
|
|
;
|
|
} else if (!period && s[pos] == '.') {
|
|
period = true;
|
|
} else {
|
|
parse_error(s, pos, "Unexpected char in number");
|
|
return false;
|
|
}
|
|
pos = pos + 1;
|
|
}
|
|
string r = s.substr(i, len - i);
|
|
if (period) {
|
|
if (!check_type('r', param)) {
|
|
return false;
|
|
}
|
|
param->r = atof(r.c_str());
|
|
} else {
|
|
if (param->attr_type() == 'r') {
|
|
param->r = atoi(r.c_str());
|
|
} else if (!check_type('i', param)) {
|
|
return false;
|
|
} else {
|
|
param->i = atoi(r.c_str());
|
|
}
|
|
}
|
|
} else {
|
|
parse_error(s, i, "invalid value");
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
|
|
bool Alg_reader::check_type(char type_char, Alg_parameter_ptr param)
|
|
{
|
|
return param->attr_type() == type_char;
|
|
}
|
|
|
|
|
|
//duration_lookup = {"S": 0.5, "I": 0.5, "Q": 1, "H": 2, "W": 4}
|
|
//key_lookup = {"C": 12, "D": 14, "E": 16, "F": 17, "G": 19, "A": 21, "B": 23}
|
|
|
|
/*
|
|
def test():
|
|
reader = Alg_reader(open("data\\test.gro", "r"))
|
|
reader.parse()
|
|
score = reader->seq.notes
|
|
print "score:", score
|
|
reader = nil
|
|
*/
|