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61dbbd46cc
Original commit message from CVS: Patch by: Brian Koropoff <brianhk at cs dot washington dot edu> * ext/spc/Makefile.am: * ext/spc/gstspc.c: (gst_spc_dec_class_init), (gst_spc_dec_src_query_type), (gst_spc_dec_init), (gst_spc_dec_dispose), (gst_spc_dec_sink_event), (gst_spc_duration), (gst_spc_fadeout), (gst_spc_dec_src_event), (gst_spc_dec_src_query), (spc_play), (spc_setup): * ext/spc/gstspc.h: * ext/spc/tag.c: (spc_tag_is_extended), (spc_tag_is_text_format), (spc_tag_is_present), (spc_tag_unpack_date), (spc_tag_clear), (spc_tag_get_info), (spc_tag_free): * ext/spc/tag.h: Add support for some essential features like seeking, reading song duration and extended tags. Fixes bug #454151.
353 lines
10 KiB
C
353 lines
10 KiB
C
/* Copyright (C) 2007 Brian Koropoff <bkoropoff at gmail com>
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*
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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 Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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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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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include <glib/gstring.h>
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#include <glib/gtypes.h>
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#include <glib/gmem.h>
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#include <glib/gprintf.h>
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#include <tag.h>
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#include <string.h>
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#include <stdlib.h>
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#define EXTENDED_OFFSET 0x10200
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#define EXTENDED_MAGIC ((guint32) ('x' << 0 | 'i' << 8 | 'd' << 16 | '6' << 24))
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#define TYPE_LENGTH 0x0
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#define TYPE_STRING 0x1
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#define TYPE_INTEGER 0x4
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#define TAG_TITLE 0x01
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#define TAG_GAME 0x02
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#define TAG_ARTIST 0x03
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#define TAG_DUMPER 0x04
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#define TAG_DUMP_DATE 0x05
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#define TAG_EMULATOR 0x06
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#define TAG_COMMENT 0x07
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#define TAG_ALBUM 0x10
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#define TAG_DISC 0x11
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#define TAG_TRACK 0x12
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#define TAG_PUBLISHER 0x13
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#define TAG_YEAR 0x14
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#define TAG_INTRO 0x30
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#define TAG_LOOP 0x31
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#define TAG_END 0x32
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#define TAG_FADE 0x33
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#define TAG_MUTED 0x34
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#define TAG_COUNT 0x35
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#define TAG_AMP 0x36
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#define READ_INT8(data, offset) (data[offset])
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#define READ_INT16(data, offset) ((data[offset] << 0) + (data[offset+1] << 8))
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#define READ_INT24(data, offset) ((data[offset] << 0) + (data[offset+1] << 8) + (data[offset+2] << 16))
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#define READ_INT32(data, offset) ((data[offset] << 0) + (data[offset+1] << 8) + (data[offset+2] << 16) + (data[offset+3] << 24))
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static inline gboolean
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spc_tag_is_extended (guchar * data, guint length)
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{
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// Extended tags come at the end of the file (at a known offset)
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// and start with "xid6"
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return (length > EXTENDED_OFFSET + 4
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&& READ_INT32 (data, EXTENDED_OFFSET) == EXTENDED_MAGIC);
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}
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static inline gboolean
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spc_tag_is_text_format (guchar * data, guint length)
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{
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// Because the id666 format is brain dead, there's
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// no definite way to decide if it is in text
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// format. This function implements a set of
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// heuristics to make a best-effort guess.
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// If the date field contains separators, it is probably text
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if (data[0xA0] == '/' || data[0xA0] == '.')
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return TRUE;
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// If the first byte of the date field is small (but not 0,
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// which could indicate an empty string), it's probably binary
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if (data[0x9E] >= 1 && data[0x9E] <= 31)
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return FALSE;
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// If all previous tests turned up nothing, assume it's text
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return TRUE;
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}
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static inline gboolean
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spc_tag_is_present (guchar * data, guint length)
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{
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return data[0x23] == 26;
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}
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static inline GDate *
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spc_tag_unpack_date (guint32 packed)
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{
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guint dump_year = packed / 10000;
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guint dump_month = (packed % 10000) / 100;
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guint dump_day = packed % 100;
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if (dump_month == 0)
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dump_month = 1;
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if (dump_day == 0)
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dump_day = 1;
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if (dump_year != 0)
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return g_date_new_dmy (dump_day, dump_month, dump_year);
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else
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return NULL;
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}
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void
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spc_tag_clear (spc_tag_info * info)
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{
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info->title = info->game = info->publisher = info->artist = info->album =
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info->comment = info->dumper = NULL;
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info->dump_date = NULL;
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info->time_seconds = 0;
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info->time_fade_milliseconds = 0;
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info->time_intro = 0;
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info->time_end = 0;
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info->time_loop = 0;
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info->time_fade = 0;
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info->loop_count = 0;
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info->muted = 0;
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info->disc = 0;
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info->amplification = 0;
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}
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void
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spc_tag_get_info (guchar * data, guint length, spc_tag_info * info)
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{
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spc_tag_clear (info);
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if (spc_tag_is_present (data, length)) {
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gboolean text_format = spc_tag_is_text_format (data, length);
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info->title = g_new0 (gchar, 0x21);
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info->game = g_new0 (gchar, 0x21);
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info->artist = g_new0 (gchar, 0x21);
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info->dumper = g_new0 (gchar, 0x10);
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info->comment = g_new0 (gchar, 0x32);
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strncpy (info->title, (gchar *) & data[0x2E], 32);
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strncpy (info->artist, (gchar *) & data[(text_format ? 0xB1 : 0xB0)], 32);
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strncpy (info->game, (gchar *) & data[0x4E], 32);
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strncpy (info->dumper, (gchar *) & data[0x6E], 16);
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strncpy (info->comment, (gchar *) & data[0x7E], 32);
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if (text_format) {
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gchar time[4];
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gchar fade[6];
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guint dump_year, dump_month, dump_day;
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strncpy (time, (gchar *) data + 0xA9, 3);
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strncpy (fade, (gchar *) data + 0xAC, 5);
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time[3] = fade[5] = 0;
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info->time_seconds = atoi (time);
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info->time_fade_milliseconds = atoi (fade);
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dump_year = (guint) atoi ((gchar *) data + 0x9E);
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dump_month = (guint) atoi ((gchar *) data + 0x9E + 3);
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dump_day = (guint) atoi ((gchar *) data + 0x9E + 3 + 3);
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if (dump_month == 0)
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dump_month = 1;
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if (dump_day == 0)
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dump_day = 1;
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if (dump_year != 0)
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info->dump_date = g_date_new_dmy (dump_day, dump_month, dump_year);
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info->muted = READ_INT8 (data, 0xD1);
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info->emulator = READ_INT8 (data, 0xD2);
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} else {
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info->time_seconds = READ_INT24 (data, 0xA9);
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info->time_fade_milliseconds = READ_INT32 (data, 0xAC);
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info->dump_date = spc_tag_unpack_date (READ_INT32 (data, 0x9E));
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info->muted = READ_INT8 (data, 0xD0);
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info->emulator = READ_INT8 (data, 0xD1);
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}
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}
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if (spc_tag_is_extended (data, length)) {
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guchar *chunk = data + EXTENDED_OFFSET + 8;
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guint32 chunk_size = *((guint32 *) (data + EXTENDED_OFFSET + 4));
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guchar *subchunk, *subchunk_next;
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for (subchunk = chunk; subchunk < chunk + chunk_size;
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subchunk = subchunk_next) {
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guint8 tag = READ_INT8 (subchunk, 0);
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guint8 type = READ_INT8 (subchunk, 1);
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guint16 length = READ_INT16 (subchunk, 2);
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guchar *value = subchunk + 4;
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switch (type) {
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case TYPE_LENGTH:
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{
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switch (tag) {
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case TAG_TRACK:
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info->track = READ_INT8 (subchunk, 2 + 1);
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break;
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case TAG_YEAR:
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info->year = READ_INT16 (subchunk, 2);
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break;
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case TAG_COUNT:
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info->loop_count = READ_INT8 (subchunk, 2);
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break;
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case TAG_EMULATOR:
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info->emulator = READ_INT8 (subchunk, 2);
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break;
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case TAG_DISC:
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info->disc = READ_INT8 (subchunk, 2);
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break;
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case TAG_MUTED:
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info->muted = READ_INT8 (subchunk, 2);
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break;
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default:
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break;
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}
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subchunk_next = subchunk + 4;
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break;
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}
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case TYPE_STRING:
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{
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gchar *dest;
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if (length <= 1)
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dest = NULL;
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else
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switch (tag) {
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case TAG_TITLE:
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dest = info->title = g_renew (gchar, info->title, length);
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break;
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case TAG_GAME:
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dest = info->game = g_renew (gchar, info->game, length);
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break;
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case TAG_ARTIST:
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dest = info->artist = g_renew (gchar, info->artist, length);
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break;
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case TAG_ALBUM:
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dest = info->album = g_renew (gchar, info->album, length);
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break;
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case TAG_DUMPER:
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dest = info->dumper = g_renew (gchar, info->dumper, length);
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break;
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case TAG_COMMENT:
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dest = info->comment = g_renew (gchar, info->comment, length);
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break;
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case TAG_PUBLISHER:
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dest = info->publisher =
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g_renew (gchar, info->publisher, length);
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break;
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default:
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dest = NULL;
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break;
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}
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if (dest)
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strncpy (dest, (gchar *) value, length);
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subchunk_next = value + length;
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break;
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}
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case TYPE_INTEGER:
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{
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switch (tag) {
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case TAG_INTRO:
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info->time_intro = READ_INT32 (value, 0);
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break;
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case TAG_END:
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info->time_end = READ_INT32 (value, 0);
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break;
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case TAG_FADE:
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info->time_fade = READ_INT32 (value, 0);
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break;
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case TAG_LOOP:
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info->time_loop = READ_INT32 (value, 0);
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break;
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case TAG_DUMP_DATE:
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info->dump_date = spc_tag_unpack_date (READ_INT32 (value, 0));
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break;
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case TAG_AMP:
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info->amplification = READ_INT32 (value, 0);
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break;
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default:
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break;
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}
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subchunk_next = value + length;
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break;
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}
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default:
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subchunk_next = value + length;
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break;
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}
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}
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}
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if (info->title && !*info->title) {
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g_free (info->title);
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info->title = NULL;
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}
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if (info->game && !*info->game) {
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g_free (info->game);
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info->game = NULL;
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}
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if (info->artist && !*info->artist) {
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g_free (info->artist);
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info->artist = NULL;
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}
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if (info->album && !*info->album) {
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g_free (info->album);
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info->album = NULL;
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}
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if (info->publisher && !*info->publisher) {
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g_free (info->publisher);
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info->publisher = NULL;
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}
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if (info->comment && !*info->comment) {
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g_free (info->comment);
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info->comment = NULL;
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}
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if (info->dumper && !*info->dumper) {
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g_free (info->dumper);
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info->dumper = NULL;
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}
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}
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void
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spc_tag_free (spc_tag_info * info)
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{
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if (info->title)
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g_free (info->title);
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if (info->game)
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g_free (info->game);
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if (info->artist)
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g_free (info->artist);
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if (info->album)
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g_free (info->album);
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if (info->publisher)
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g_free (info->publisher);
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if (info->comment)
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g_free (info->comment);
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if (info->dumper)
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g_free (info->dumper);
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if (info->dump_date)
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g_date_free (info->dump_date);
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}
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