diff options
Diffstat (limited to 'Src/external_dependencies/libdiscid-0.6.2/src/toc.c')
| -rw-r--r-- | Src/external_dependencies/libdiscid-0.6.2/src/toc.c | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/Src/external_dependencies/libdiscid-0.6.2/src/toc.c b/Src/external_dependencies/libdiscid-0.6.2/src/toc.c new file mode 100644 index 00000000..b1ec59f2 --- /dev/null +++ b/Src/external_dependencies/libdiscid-0.6.2/src/toc.c @@ -0,0 +1,116 @@ +/* -------------------------------------------------------------------------- + + MusicBrainz -- The Internet music metadatabase + + Copyright (C) 2006 Lukas Lalinsky + + This library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + This library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with this library; if not, write to the Free Software + Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + +--------------------------------------------------------------------------- */ + +#ifdef _MSC_VER + #define _CRT_SECURE_NO_WARNINGS + #if (_MSC_VER < 1900) + #define snprintf _snprintf + #endif +#endif + +#include <stdlib.h> +#include <stdio.h> +#include <string.h> +#include <assert.h> + +#include "discid/discid_private.h" + +#define XA_INTERVAL ((60 + 90 + 2) * 75) +#define DATA_TRACK 0x04 + + +int mb_disc_load_toc(mb_disc_private *disc, mb_disc_toc *toc) { + int first_audio_track, last_audio_track, i; + mb_disc_toc_track *track; + + if (toc->first_track_num < 1) { + snprintf(disc->error_msg, MB_ERROR_MSG_LENGTH, + "invalid CD TOC - first track number must be 1 or higher"); + return 0; + } + + if (toc->last_track_num < 1) { + snprintf(disc->error_msg, MB_ERROR_MSG_LENGTH, + "invalid CD TOC - last track number must be 99 or lower"); + return 0; + } + + /* we can't just skip data tracks at the front + * releases are always expected to start with track 1 by MusicBrainz + */ + first_audio_track = toc->first_track_num; + last_audio_track = -1; + /* scan the TOC for audio tracks */ + for (i = toc->first_track_num; i <= toc->last_track_num; i++) { + track = &toc->tracks[i]; + if ( !(track->control & DATA_TRACK) ) { + last_audio_track = i; + } + } + + if (last_audio_track < 0) { + snprintf(disc->error_msg, MB_ERROR_MSG_LENGTH, + "no actual audio tracks on disc: CDROM or DVD?"); + return 0; + } + + disc->first_track_num = first_audio_track; + disc->last_track_num = last_audio_track; + + /* get offsets for all found data tracks */ + for (i = first_audio_track; i <= last_audio_track; i++) { + track = &toc->tracks[i]; + if (track->address > 0) { + disc->track_offsets[i] = track->address + 150; + } else { + /* this seems to happen on "copy-protected" discs */ + disc->track_offsets[i] = 150; + } + } + + /* if the last audio track is not the last track on the CD, + * use the offset of the next data track as the "lead-out" offset */ + if (last_audio_track < toc->last_track_num) { + track = &toc->tracks[last_audio_track + 1]; + disc->track_offsets[0] = track->address - XA_INTERVAL + 150; + } else { + /* use the regular lead-out track */ + track = &toc->tracks[0]; + disc->track_offsets[0] = track->address + 150; + } + + /* as long as the lead-out isn't actually bigger than + * the position of the last track, the last track is invalid. + * This happens on "copy-protected"/invalid discs. + * The track is then neither a valid audio track, nor data track. + */ + while (disc->track_offsets[0] < disc->track_offsets[last_audio_track]) { + disc->last_track_num = --last_audio_track; + disc->track_offsets[last_audio_track + 1] = 0; + track = &toc->tracks[last_audio_track + 1]; + disc->track_offsets[0] = track->address - XA_INTERVAL + 150; + } + + return 1; +} + +/* EOF */ |