cuesheet.c

这是著名的TCPMP播放器在WINDWOWS,和WINCE下编译通过的源程序.笔者对其中的LIBMAD库做了针对ARM MPU的优化. 并增加了词幕功能.

				}
				xx = local__parse_msf_(field);
				if(xx < 0) {
					if(is_cdda) {
						*error_message = "illegal INDEX offset (not of the form MM:SS:FF)";
						return false;
					}
					xx = local__parse_int64_(field);
					if(xx < 0) {
						*error_message = "illegal INDEX offset";
						return false;
					}
				}
				if(is_cdda && cs->num_tracks == 1 && cs->tracks[0].num_indices == 0 && xx != 0) {
					*error_message = "first INDEX of first TRACK must have an offset of 00:00:00";
					return false;
				}
				if(is_cdda && track->num_indices > 0 && (FLAC__uint64)xx <= track->indices[track->num_indices-1].offset) {
					*error_message = "CD-DA INDEX offsets must increase in time";
					return false;
				}
				/* fill in track offset if it's the first index of the track */
				if(track->num_indices == 0)
					track->offset = (FLAC__uint64)xx;
				if(is_cdda && cs->num_tracks > 1) {
					const FLAC__StreamMetadata_CueSheet_Track *prev = &cs->tracks[cs->num_tracks-2];
					if((FLAC__uint64)xx <= prev->offset + prev->indices[prev->num_indices-1].offset) {
						*error_message = "CD-DA INDEX offsets must increase in time";
						return false;
					}
				}
				if(!FLAC__metadata_object_cuesheet_track_insert_blank_index(cuesheet, cs->num_tracks-1, track->num_indices)) {
					*error_message = "memory allocation error";
					return false;
				}
				track->indices[track->num_indices-1].offset = (FLAC__uint64)xx - track->offset;
				track->indices[track->num_indices-1].number = in_index_num;
			}
			else if(0 == FLAC__STRCASECMP(field, "ISRC")) {
				char *l, *r;
				if(track_has_isrc) {
					*error_message = "found multiple ISRC commands";
					return false;
				}
				if(in_track_num < 0 || in_index_num >= 0) {
					*error_message = "ISRC command must come after TRACK but before INDEX";
					return false;
				}
				if(0 == (field = local__get_field_(&line, /*allow_quotes=*/false))) {
					*error_message = "ISRC is missing ISRC number";
					return false;
				}
				/* strip out dashes */
				for(l = r = field; *r; r++) {
					if(*r != '-')
						*l++ = *r;
				}
				*l = '\0';
				if(strlen(field) != 12 || strspn(field, "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789") < 5 || strspn(field+5, "1234567890") != 7) {
					*error_message = "invalid ISRC number";
					return false;
				}
				strcpy(cs->tracks[cs->num_tracks-1].isrc, field);
				track_has_isrc = true;
			}
			else if(0 == FLAC__STRCASECMP(field, "TRACK")) {
				if(cs->num_tracks > 0) {
					const FLAC__StreamMetadata_CueSheet_Track *prev = &cs->tracks[cs->num_tracks-1];
					if(
						prev->num_indices == 0 ||
						(
						 	is_cdda &&
							(
								(prev->num_indices == 1 && prev->indices[0].number != 1) ||
								(prev->num_indices == 2 && prev->indices[0].number != 1 && prev->indices[1].number != 1)
							)
						)
					) {
						*error_message = is_cdda?
							"previous TRACK must specify at least one INDEX 01" :
							"previous TRACK must specify at least one INDEX";
						return false;
					}
				}
				if(0 == (field = local__get_field_(&line, /*allow_quotes=*/false))) {
					*error_message = "TRACK is missing track number";
					return false;
				}
				in_track_num = local__parse_int_(field);
				if(in_track_num < 0) {
					*error_message = "TRACK has invalid track number";
					return false;
				}
				if(in_track_num == 0) {
					*error_message = "TRACK number must be greater than 0";
					return false;
				}
				if(is_cdda && in_track_num > 99) {
					*error_message = "CD-DA TRACK number must be between 1 and 99, inclusive";
					return false;
				}
				if(is_cdda && cs->num_tracks > 0 && in_track_num != cs->tracks[cs->num_tracks-1].number + 1) {
					*error_message = "CD-DA TRACK numbers must be sequential";
					return false;
				}
				/*@@@ search for duplicate track number? */
				if(0 == (field = local__get_field_(&line, /*allow_quotes=*/false))) {
					*error_message = "TRACK is missing a track type after the track number";
					return false;
				}
				if(!FLAC__metadata_object_cuesheet_insert_blank_track(cuesheet, cs->num_tracks)) {
					*error_message = "memory allocation error";
					return false;
				}
				cs->tracks[cs->num_tracks-1].number = in_track_num;
				cs->tracks[cs->num_tracks-1].type = (0 == FLAC__STRCASECMP(field, "AUDIO"))? 0 : 1; /*@@@ should we be more strict with the value here? */
				in_index_num = -1;
				track_has_flags = false;
				track_has_isrc = false;
			}
			else if(0 == FLAC__STRCASECMP(field, "REM")) {
				if(0 != (field = local__get_field_(&line, /*allow_quotes=*/false))) {
					if(0 == strcmp(field, "FLAC__lead-in")) {
						FLAC__int64 xx;
						if(0 == (field = local__get_field_(&line, /*allow_quotes=*/false))) {
							*error_message = "FLAC__lead-in is missing offset";
							return false;
						}
						xx = local__parse_int64_(field);
						if(xx < 0) {
							*error_message = "illegal FLAC__lead-in offset";
							return false;
						}
						if(is_cdda && xx % 588 != 0) {
							*error_message = "illegal CD-DA FLAC__lead-in offset, must be even multiple of 588 samples";
							return false;
						}
						cs->lead_in = (FLAC__uint64)xx;
					}
					else if(0 == strcmp(field, "FLAC__lead-out")) {
						int track_num;
						FLAC__int64 offset;
						if(has_forced_leadout) {
							*error_message = "multiple FLAC__lead-out commands";
							return false;
						}
						if(0 == (field = local__get_field_(&line, /*allow_quotes=*/false))) {
							*error_message = "FLAC__lead-out is missing track number";
							return false;
						}
						track_num = local__parse_int_(field);
						if(track_num < 0) {
							*error_message = "illegal FLAC__lead-out track number";
							return false;
						}
						forced_leadout_track_num = (unsigned)track_num;
						/*@@@ search for duplicate track number? */
						if(0 == (field = local__get_field_(&line, /*allow_quotes=*/false))) {
							*error_message = "FLAC__lead-out is missing offset";
							return false;
						}
						offset = local__parse_int64_(field);
						if(offset < 0) {
							*error_message = "illegal FLAC__lead-out offset";
							return false;
						}
						forced_leadout_track_offset = (FLAC__uint64)offset;
						if(forced_leadout_track_offset != lead_out_offset) {
							*error_message = "FLAC__lead-out offset does not match end-of-stream offset";
							return false;
						}
						has_forced_leadout = true;
					}
				}
			}
		}
	}

	if(cs->num_tracks == 0) {
		*error_message = "there must be at least one TRACK command";
		return false;
	}
	else {
		const FLAC__StreamMetadata_CueSheet_Track *prev = &cs->tracks[cs->num_tracks-1];
		if(
			prev->num_indices == 0 ||
			(
				is_cdda &&
				(
					(prev->num_indices == 1 && prev->indices[0].number != 1) ||
					(prev->num_indices == 2 && prev->indices[0].number != 1 && prev->indices[1].number != 1)
				)
			)
		) {
			*error_message = is_cdda?
				"previous TRACK must specify at least one INDEX 01" :
				"previous TRACK must specify at least one INDEX";
			return false;
		}
	}

	if(!has_forced_leadout) {
		forced_leadout_track_num = is_cdda? 170 : cs->num_tracks;
		forced_leadout_track_offset = lead_out_offset;
	}
	if(!FLAC__metadata_object_cuesheet_insert_blank_track(cuesheet, cs->num_tracks)) {
		*error_message = "memory allocation error";
		return false;
	}
	cs->tracks[cs->num_tracks-1].number = forced_leadout_track_num;
	cs->tracks[cs->num_tracks-1].offset = forced_leadout_track_offset;

	if(!feof(file)) {
		*error_message = "read error";
		return false;
	}
	return true;
#undef FLAC__STRCASECMP
}

FLAC__StreamMetadata *grabbag__cuesheet_parse(FILE *file, const char **error_message, unsigned *last_line_read, FLAC__bool is_cdda, FLAC__uint64 lead_out_offset)
{
	FLAC__StreamMetadata *cuesheet;

	FLAC__ASSERT(0 != file);
	FLAC__ASSERT(0 != error_message);
	FLAC__ASSERT(0 != last_line_read);

	*last_line_read = 0;
	cuesheet = FLAC__metadata_object_new(FLAC__METADATA_TYPE_CUESHEET);

	if(0 == cuesheet) {
		*error_message = "memory allocation error";
		return 0;
	}

	if(!local__cuesheet_parse_(file, error_message, last_line_read, cuesheet, is_cdda, lead_out_offset)) {
		FLAC__metadata_object_delete(cuesheet);
		return 0;
	}

	return cuesheet;
}

void grabbag__cuesheet_emit(FILE *file, const FLAC__StreamMetadata *cuesheet, const char *file_reference)
{
	const FLAC__StreamMetadata_CueSheet *cs;
	unsigned track_num, index_num;

	FLAC__ASSERT(0 != file);
	FLAC__ASSERT(0 != cuesheet);
	FLAC__ASSERT(cuesheet->type == FLAC__METADATA_TYPE_CUESHEET);

	cs = &cuesheet->data.cue_sheet;

	if(*(cs->media_catalog_number))
		fprintf(file, "CATALOG %s\n", cs->media_catalog_number);
	fprintf(file, "FILE %s\n", file_reference);

	for(track_num = 0; track_num < cs->num_tracks-1; track_num++) {
		const FLAC__StreamMetadata_CueSheet_Track *track = cs->tracks + track_num;

		fprintf(file, "  TRACK %02u %s\n", (unsigned)track->number, track->type == 0? "AUDIO" : "DATA");

		if(track->pre_emphasis)
			fprintf(file, "    FLAGS PRE\n");
		if(*(track->isrc))
			fprintf(file, "    ISRC %s\n", track->isrc);

		for(index_num = 0; index_num < track->num_indices; index_num++) {
			const FLAC__StreamMetadata_CueSheet_Index *index = track->indices + index_num;

			fprintf(file, "    INDEX %02u ", (unsigned)index->number);
			if(cs->is_cd) {
				const unsigned logical_frame = (unsigned)((track->offset + index->offset) / (44100 / 75));
				unsigned m, s, f;
				grabbag__cuesheet_frame_to_msf(logical_frame, &m, &s, &f);
				fprintf(file, "%02u:%02u:%02u\n", m, s, f);
			}
			else
#ifdef _MSC_VER
				fprintf(file, "%I64u\n", track->offset + index->offset);
#else
				fprintf(file, "%llu\n", track->offset + index->offset);
#endif
		}
	}

#ifdef _MSC_VER
	fprintf(file, "REM FLAC__lead-in %I64u\n", cs->lead_in);
	fprintf(file, "REM FLAC__lead-out %u %I64u\n", (unsigned)cs->tracks[track_num].number, cs->tracks[track_num].offset);
#else
	fprintf(file, "REM FLAC__lead-in %llu\n", cs->lead_in);
	fprintf(file, "REM FLAC__lead-out %u %llu\n", (unsigned)cs->tracks[track_num].number, cs->tracks[track_num].offset);
#endif
}