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117 lines
3.6 KiB
C
117 lines
3.6 KiB
C
/* --------------------------------------------------------------------------
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MusicBrainz -- The Internet music metadatabase
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Copyright (C) 2006 Lukas Lalinsky
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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--------------------------------------------------------------------------- */
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#ifdef _MSC_VER
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#define _CRT_SECURE_NO_WARNINGS
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#if (_MSC_VER < 1900)
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#define snprintf _snprintf
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#endif
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#endif
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <assert.h>
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#include "discid/discid_private.h"
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#define XA_INTERVAL ((60 + 90 + 2) * 75)
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#define DATA_TRACK 0x04
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int mb_disc_load_toc(mb_disc_private *disc, mb_disc_toc *toc) {
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int first_audio_track, last_audio_track, i;
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mb_disc_toc_track *track;
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if (toc->first_track_num < 1) {
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snprintf(disc->error_msg, MB_ERROR_MSG_LENGTH,
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"invalid CD TOC - first track number must be 1 or higher");
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return 0;
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}
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if (toc->last_track_num < 1) {
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snprintf(disc->error_msg, MB_ERROR_MSG_LENGTH,
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"invalid CD TOC - last track number must be 99 or lower");
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return 0;
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}
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/* we can't just skip data tracks at the front
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* releases are always expected to start with track 1 by MusicBrainz
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*/
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first_audio_track = toc->first_track_num;
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last_audio_track = -1;
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/* scan the TOC for audio tracks */
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for (i = toc->first_track_num; i <= toc->last_track_num; i++) {
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track = &toc->tracks[i];
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if ( !(track->control & DATA_TRACK) ) {
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last_audio_track = i;
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}
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}
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if (last_audio_track < 0) {
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snprintf(disc->error_msg, MB_ERROR_MSG_LENGTH,
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"no actual audio tracks on disc: CDROM or DVD?");
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return 0;
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}
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disc->first_track_num = first_audio_track;
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disc->last_track_num = last_audio_track;
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/* get offsets for all found data tracks */
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for (i = first_audio_track; i <= last_audio_track; i++) {
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track = &toc->tracks[i];
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if (track->address > 0) {
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disc->track_offsets[i] = track->address + 150;
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} else {
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/* this seems to happen on "copy-protected" discs */
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disc->track_offsets[i] = 150;
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}
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}
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/* if the last audio track is not the last track on the CD,
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* use the offset of the next data track as the "lead-out" offset */
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if (last_audio_track < toc->last_track_num) {
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track = &toc->tracks[last_audio_track + 1];
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disc->track_offsets[0] = track->address - XA_INTERVAL + 150;
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} else {
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/* use the regular lead-out track */
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track = &toc->tracks[0];
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disc->track_offsets[0] = track->address + 150;
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}
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/* as long as the lead-out isn't actually bigger than
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* the position of the last track, the last track is invalid.
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* This happens on "copy-protected"/invalid discs.
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* The track is then neither a valid audio track, nor data track.
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*/
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while (disc->track_offsets[0] < disc->track_offsets[last_audio_track]) {
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disc->last_track_num = --last_audio_track;
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disc->track_offsets[last_audio_track + 1] = 0;
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track = &toc->tracks[last_audio_track + 1];
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disc->track_offsets[0] = track->address - XA_INTERVAL + 150;
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}
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return 1;
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}
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/* EOF */
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