ext/spc/: Add support for some essential features like seeking, reading song duration and extended tags. Fixes bug #4...

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.
This commit is contained in:
Brian Koropoff 2008-05-20 09:04:48 +00:00 committed by Sebastian Dröge
parent b641c49a4c
commit 61dbbd46cc
6 changed files with 693 additions and 31 deletions

View file

@ -1,3 +1,21 @@
2008-05-20 Sebastian Dröge <slomo@circular-chaos.org>
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.
2008-05-19 Sebastian Dröge <slomo@circular-chaos.org> 2008-05-19 Sebastian Dröge <slomo@circular-chaos.org>
* tests/check/elements/deinterleave.c: (GST_START_TEST): * tests/check/elements/deinterleave.c: (GST_START_TEST):

View file

@ -1,6 +1,6 @@
plugin_LTLIBRARIES = libgstspc.la plugin_LTLIBRARIES = libgstspc.la
libgstspc_la_SOURCES = gstspc.c libgstspc_la_SOURCES = gstspc.c tag.c
libgstspc_la_CFLAGS = $(GST_CFLAGS) $(SPC_CFLAGS) libgstspc_la_CFLAGS = $(GST_CFLAGS) $(SPC_CFLAGS)
libgstspc_la_LIBADD = $(GST_LIBS) $(SPC_LIBS) libgstspc_la_LIBADD = $(GST_LIBS) $(SPC_LIBS)

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@ -1,5 +1,6 @@
/* Copyright (C) 2004-2005 Michael Pyne <michael dot pyne at kdemail net> /* Copyright (C) 2004-2005 Michael Pyne <michael dot pyne at kdemail net>
* Copyright (C) 2004-2006 Chris Lee <clee at kde org> * Copyright (C) 2004-2006 Chris Lee <clee at kde org>
* Copyright (C) 2007 Brian Koropoff <bkoropoff at gmail com>
* *
* This library is free software; you can redistribute it and/or * This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public * modify it under the terms of the GNU Library General Public
@ -24,12 +25,14 @@
#include "gstspc.h" #include "gstspc.h"
#include <string.h> #include <string.h>
#include <glib/gprintf.h>
#include <glib.h>
static const GstElementDetails gst_spc_dec_details = static const GstElementDetails gst_spc_dec_details =
GST_ELEMENT_DETAILS ("OpenSPC SPC decoder", GST_ELEMENT_DETAILS ("OpenSPC SPC decoder",
"Codec/Audio/Decoder", "Codec/Audio/Decoder",
"Uses OpenSPC to emulate an SPC processor", "Uses OpenSPC to emulate an SPC processor",
"Chris Lee <clee@kde.org>"); "Chris Lee <clee@kde.org>, Brian Koropoff <bkoropoff@gmail.com>");
static GstStaticPadTemplate sink_factory = static GstStaticPadTemplate sink_factory =
GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS, GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
@ -52,6 +55,7 @@ static gboolean gst_spc_dec_src_query (GstPad * pad, GstQuery * query);
static GstStateChangeReturn gst_spc_dec_change_state (GstElement * element, static GstStateChangeReturn gst_spc_dec_change_state (GstElement * element,
GstStateChange transition); GstStateChange transition);
static void spc_play (GstPad * pad); static void spc_play (GstPad * pad);
static void gst_spc_dec_dispose (GObject * object);
static gboolean spc_setup (GstSpcDec * spc); static gboolean spc_setup (GstSpcDec * spc);
static gboolean static gboolean
@ -117,15 +121,30 @@ static void
gst_spc_dec_class_init (GstSpcDecClass * klass) gst_spc_dec_class_init (GstSpcDecClass * klass)
{ {
GstElementClass *element_class = (GstElementClass *) klass; GstElementClass *element_class = (GstElementClass *) klass;
GObjectClass *gobject_class = (GObjectClass *) klass;
element_class->change_state = GST_DEBUG_FUNCPTR (gst_spc_dec_change_state); element_class->change_state = GST_DEBUG_FUNCPTR (gst_spc_dec_change_state);
gobject_class->dispose = gst_spc_dec_dispose;
} }
static const GstQueryType *
gst_spc_dec_src_query_type (GstPad * pad)
{
static const GstQueryType query_types[] = {
GST_QUERY_DURATION,
GST_QUERY_POSITION,
(GstQueryType) 0
};
return query_types;
}
static void static void
gst_spc_dec_init (GstSpcDec * spc, GstSpcDecClass * klass) gst_spc_dec_init (GstSpcDec * spc, GstSpcDecClass * klass)
{ {
spc->sinkpad = gst_pad_new_from_static_template (&sink_factory, "sink"); spc->sinkpad = gst_pad_new_from_static_template (&sink_factory, "sink");
gst_pad_set_query_function (spc->sinkpad, NULL); /* gst_pad_set_query_function (spc->sinkpad, NULL); */
gst_pad_set_event_function (spc->sinkpad, gst_spc_dec_sink_event); gst_pad_set_event_function (spc->sinkpad, gst_spc_dec_sink_event);
gst_pad_set_chain_function (spc->sinkpad, gst_spc_dec_chain); gst_pad_set_chain_function (spc->sinkpad, gst_spc_dec_chain);
gst_element_add_pad (GST_ELEMENT (spc), spc->sinkpad); gst_element_add_pad (GST_ELEMENT (spc), spc->sinkpad);
@ -133,11 +152,26 @@ gst_spc_dec_init (GstSpcDec * spc, GstSpcDecClass * klass)
spc->srcpad = gst_pad_new_from_static_template (&src_factory, "src"); spc->srcpad = gst_pad_new_from_static_template (&src_factory, "src");
gst_pad_set_event_function (spc->srcpad, gst_spc_dec_src_event); gst_pad_set_event_function (spc->srcpad, gst_spc_dec_src_event);
gst_pad_set_query_function (spc->srcpad, gst_spc_dec_src_query); gst_pad_set_query_function (spc->srcpad, gst_spc_dec_src_query);
gst_pad_set_query_type_function (spc->srcpad, gst_spc_dec_src_query_type);
gst_pad_use_fixed_caps (spc->srcpad); gst_pad_use_fixed_caps (spc->srcpad);
gst_element_add_pad (GST_ELEMENT (spc), spc->srcpad); gst_element_add_pad (GST_ELEMENT (spc), spc->srcpad);
spc->buf = NULL; spc->buf = NULL;
spc->initialized = FALSE; spc->initialized = FALSE;
spc_tag_clear (&spc->tag_info);
}
static void
gst_spc_dec_dispose (GObject * object)
{
GstSpcDec *spc = GST_SPC_DEC (object);
if (spc->buf) {
gst_buffer_unref (spc->buf);
spc->buf = NULL;
}
spc_tag_free (&spc->tag_info);
} }
static GstFlowReturn static GstFlowReturn
@ -160,7 +194,7 @@ static gboolean
gst_spc_dec_sink_event (GstPad * pad, GstEvent * event) gst_spc_dec_sink_event (GstPad * pad, GstEvent * event)
{ {
GstSpcDec *spc = GST_SPC_DEC (gst_pad_get_parent (pad)); GstSpcDec *spc = GST_SPC_DEC (gst_pad_get_parent (pad));
gboolean result; gboolean result = TRUE;
switch (GST_EVENT_TYPE (event)) { switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_EOS: case GST_EVENT_EOS:
@ -180,6 +214,38 @@ gst_spc_dec_sink_event (GstPad * pad, GstEvent * event)
return result; return result;
} }
static gint64
gst_spc_duration (GstSpcDec * spc)
{
gint64 total_ticks =
spc->tag_info.time_intro +
spc->tag_info.time_loop * spc->tag_info.loop_count +
spc->tag_info.time_end;
if (total_ticks) {
return (gint64) gst_util_uint64_scale (total_ticks, GST_SECOND, 64000);
} else if (spc->tag_info.time_seconds) {
gint64 time = (gint64) spc->tag_info.time_seconds * GST_SECOND;
return time;
} else {
return (gint64) (3 * 60) * GST_SECOND;
}
}
static gint64
gst_spc_fadeout (GstSpcDec * spc)
{
if (spc->tag_info.time_fade) {
return (gint64) gst_util_uint64_scale ((guint64) spc->tag_info.time_fade,
GST_SECOND, 64000);
} else if (spc->tag_info.time_fade_milliseconds) {
return (gint64) (spc->tag_info.time_fade_milliseconds * GST_MSECOND);
} else {
return 10 * GST_SECOND;
}
}
static gboolean static gboolean
gst_spc_dec_src_event (GstPad * pad, GstEvent * event) gst_spc_dec_src_event (GstPad * pad, GstEvent * event)
{ {
@ -187,6 +253,79 @@ gst_spc_dec_src_event (GstPad * pad, GstEvent * event)
gboolean result = FALSE; gboolean result = FALSE;
switch (GST_EVENT_TYPE (event)) { switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_SEEK:
{
gdouble rate;
GstFormat format;
GstSeekFlags flags;
GstSeekType start_type, stop_type;
gint64 start, stop;
gboolean flush;
gst_event_parse_seek (event, &rate, &format, &flags, &start_type, &start,
&stop_type, &stop);
if (format != GST_FORMAT_TIME) {
GST_DEBUG_OBJECT (spc, "seeking is only supported in TIME format");
break;
}
if (start_type != GST_SEEK_TYPE_SET || stop_type != GST_SEEK_TYPE_NONE) {
GST_DEBUG_OBJECT (spc, "unsupported seek type");
break;
}
if (stop_type == GST_SEEK_TYPE_NONE)
stop = GST_CLOCK_TIME_NONE;
if (start_type == GST_SEEK_TYPE_SET) {
guint64 cur =
gst_util_uint64_scale (spc->byte_pos, GST_SECOND, 32000 * 2 * 2);
guint64 dest = (guint64) start;
dest = CLAMP (dest, 0, gst_spc_duration (spc) + gst_spc_fadeout (spc));
if (dest == cur)
break;
flush = (flags & GST_SEEK_FLAG_FLUSH) == GST_SEEK_FLAG_FLUSH;
if (flush) {
gst_pad_push_event (spc->srcpad, gst_event_new_flush_start ());
} else {
gst_pad_stop_task (spc->srcpad);
}
GST_PAD_STREAM_LOCK (spc->srcpad);
if (flags & GST_SEEK_FLAG_SEGMENT) {
gst_element_post_message (GST_ELEMENT (spc),
gst_message_new_segment_start (GST_OBJECT (spc), format, cur));
}
if (flush) {
gst_pad_push_event (spc->srcpad, gst_event_new_flush_stop ());
}
if (stop == GST_CLOCK_TIME_NONE)
stop = (guint64) (gst_spc_duration (spc) + gst_spc_fadeout (spc));
gst_pad_push_event (spc->srcpad, gst_event_new_new_segment (FALSE, rate,
GST_FORMAT_TIME, dest, stop, dest));
/* spc->byte_pos += OSPC_Run(-1, NULL, (unsigned int) (gst_util_uint64_scale(dest - cur, 32000*2*2, GST_SECOND))); */
spc->seekpoint =
gst_util_uint64_scale (dest, 32000 * 2 * 2, GST_SECOND);
spc->seeking = TRUE;
gst_pad_start_task (spc->srcpad, (GstTaskFunction) spc_play,
spc->srcpad);
GST_PAD_STREAM_UNLOCK (spc->srcpad);
result = TRUE;
}
break;
}
default: default:
break; break;
} }
@ -204,6 +343,33 @@ gst_spc_dec_src_query (GstPad * pad, GstQuery * query)
gboolean result = TRUE; gboolean result = TRUE;
switch (GST_QUERY_TYPE (query)) { switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_DURATION:
{
GstFormat format;
gst_query_parse_duration (query, &format, NULL);
if (!spc->initialized || format != GST_FORMAT_TIME) {
result = FALSE;
break;
}
gst_query_set_duration (query, GST_FORMAT_TIME,
gst_spc_duration (spc) + gst_spc_fadeout (spc));
break;
}
case GST_QUERY_POSITION:
{
GstFormat format;
gst_query_parse_position (query, &format, NULL);
if (!spc->initialized || format != GST_FORMAT_TIME) {
result = FALSE;
break;
}
gst_query_set_position (query, GST_FORMAT_TIME,
(gint64) gst_util_uint64_scale (spc->byte_pos, GST_SECOND,
32000 * 2 * 2));
break;
}
default: default:
result = gst_pad_query_default (pad, query); result = gst_pad_query_default (pad, query);
break; break;
@ -220,11 +386,48 @@ spc_play (GstPad * pad)
GstSpcDec *spc = GST_SPC_DEC (gst_pad_get_parent (pad)); GstSpcDec *spc = GST_SPC_DEC (gst_pad_get_parent (pad));
GstFlowReturn flow_return; GstFlowReturn flow_return;
GstBuffer *out; GstBuffer *out;
gboolean seeking = spc->seeking;
gint64 duration, fade, end, position;
out = gst_buffer_new_and_alloc (1600 * 4); if (!seeking) {
gst_buffer_set_caps (out, GST_PAD_CAPS (pad)); out = gst_buffer_new_and_alloc (1600 * 4);
gst_buffer_set_caps (out, GST_PAD_CAPS (pad));
GST_BUFFER_TIMESTAMP (out) =
(gint64) gst_util_uint64_scale ((guint64) spc->byte_pos, GST_SECOND,
32000 * 2 * 2);
spc->byte_pos += OSPC_Run (-1, (short *) GST_BUFFER_DATA (out), 1600 * 4);
} else {
if (spc->seekpoint < spc->byte_pos) {
OSPC_Init (GST_BUFFER_DATA (spc->buf), GST_BUFFER_SIZE (spc->buf));
spc->byte_pos = 0;
}
spc->byte_pos += OSPC_Run (-1, NULL, 1600 * 4);
if (spc->byte_pos >= spc->seekpoint) {
spc->seeking = FALSE;
}
out = gst_buffer_new ();
gst_buffer_set_caps (out, GST_PAD_CAPS (pad));
}
OSPC_Run (-1, (short *) GST_BUFFER_DATA (out), 1600 * 4); duration = gst_spc_duration (spc);
fade = gst_spc_fadeout (spc);
end = duration + fade;
position =
(gint64) gst_util_uint64_scale ((guint64) spc->byte_pos, GST_SECOND,
32000 * 2 * 2);
if (position >= duration) {
gint16 *data = (gint16 *) GST_BUFFER_DATA (out);
guint32 size = GST_BUFFER_SIZE (out) / sizeof (gint16);
unsigned int i;
gint64 num = (fade - (position - duration));
for (i = 0; i < size; i++) {
/* Apply a parabolic volume envelope */
data[i] = (gint16) (data[i] * num / fade * num / fade);
}
}
if ((flow_return = gst_pad_push (spc->srcpad, out)) != GST_FLOW_OK) { if ((flow_return = gst_pad_push (spc->srcpad, out)) != GST_FLOW_OK) {
GST_DEBUG_OBJECT (spc, "pausing task, reason %s", GST_DEBUG_OBJECT (spc, "pausing task, reason %s",
@ -237,6 +440,11 @@ spc_play (GstPad * pad)
} }
} }
if (position >= end) {
gst_pad_pause_task (pad);
gst_pad_push_event (pad, gst_event_new_eos ());
}
gst_object_unref (spc); gst_object_unref (spc);
return; return;
@ -246,38 +454,69 @@ static gboolean
spc_setup (GstSpcDec * spc) spc_setup (GstSpcDec * spc)
{ {
guchar *data = GST_BUFFER_DATA (spc->buf); guchar *data = GST_BUFFER_DATA (spc->buf);
gboolean text_format = FALSE;
if (!spc_negotiate (spc)) { if (!spc_negotiate (spc)) {
return FALSE; return FALSE;
} }
if (data[0x23] == 26) { spc_tag_info *info = &(spc->tag_info);
GstEvent *tagevent;
GstTagList *taglist = gst_tag_list_new ();
if (data[0xA0] == '/') spc_tag_get_info (data, GST_BUFFER_SIZE (spc->buf), info);
text_format = TRUE;
gchar spctitle[0x21]; GstTagList *taglist = gst_tag_list_new ();
gchar spcartist[0x21];
gchar spcgame[0x21];
strncpy (spctitle, (gchar *) & data[0x2E], 32); if (info->title)
strncpy (spcartist, (gchar *) & data[(text_format ? 0xB1 : 0xB0)], 32); gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE, GST_TAG_TITLE,
strncpy (spcgame, (gchar *) & data[0x4E], 32); info->title, NULL);
if (info->artist)
gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE, GST_TAG_ARTIST,
info->artist, NULL);
/* Prefer the name of the official soundtrack over the name of the game (since this is
* how track numbers are derived)
*/
if (info->album)
gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE, GST_TAG_ALBUM,
info->album, NULL);
else if (info->game)
gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE, GST_TAG_ALBUM, info->game,
NULL);
if (info->year) {
GDate *date = g_date_new_dmy (1, 1, info->year);
spctitle[0x20] = '\0'; gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE, GST_TAG_DATE, date, NULL);
spcartist[0x20] = '\0'; g_date_free (date);
spcgame[0x20] = '\0';
gst_tag_list_add (taglist, GST_TAG_MERGE_APPEND,
GST_TAG_TITLE, spctitle,
GST_TAG_ARTIST, spcartist, GST_TAG_ALBUM, spcgame, NULL);
tagevent = gst_event_new_tag (taglist);
gst_element_found_tags_for_pad (GST_ELEMENT (spc), spc->srcpad, taglist);
} }
if (info->track) {
gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE, GST_TAG_TRACK_NUMBER,
info->track, NULL);
}
if (info->comment)
gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE, GST_TAG_COMMENT,
info->comment, NULL);
if (info->disc)
gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE,
GST_TAG_ALBUM_VOLUME_NUMBER, info->disc, NULL);
if (info->publisher)
gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE, GST_TAG_ORGANIZATION,
info->publisher, NULL);
if (info->dumper)
gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE, GST_TAG_CONTACT,
info->dumper, NULL);
if (info->emulator)
gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE, GST_TAG_ENCODER,
info->emulator == EMU_ZSNES ? "ZSNES" : "Snes9x", NULL);
guint64 total_duration =
(guint64) (gst_spc_duration (spc) + gst_spc_fadeout (spc));
gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE,
GST_TAG_DURATION, total_duration,
GST_TAG_GENRE, "Game", GST_TAG_CODEC, "SPC700", NULL);
gst_element_found_tags_for_pad (GST_ELEMENT (spc), spc->srcpad, taglist);
/* spc_tag_info_free(&info); */
if (OSPC_Init (GST_BUFFER_DATA (spc->buf), GST_BUFFER_SIZE (spc->buf)) != 0) { if (OSPC_Init (GST_BUFFER_DATA (spc->buf), GST_BUFFER_SIZE (spc->buf)) != 0) {
return FALSE; return FALSE;
@ -288,9 +527,15 @@ spc_setup (GstSpcDec * spc)
gst_pad_start_task (spc->srcpad, (GstTaskFunction) spc_play, spc->srcpad); gst_pad_start_task (spc->srcpad, (GstTaskFunction) spc_play, spc->srcpad);
gst_buffer_unref (spc->buf); /* We can't unreference this buffer because we might need to re-initialize
spc->buf = NULL; * the emulator with the original data during a reverse seek
* gst_buffer_unref (spc->buf);
* spc->buf = NULL;
*/
spc->initialized = TRUE; spc->initialized = TRUE;
spc->seeking = FALSE;
spc->seekpoint = 0;
spc->byte_pos = 0;
return spc->initialized; return spc->initialized;
} }

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@ -1,5 +1,6 @@
/* Copyright (C) 2004-2005 Michael Pyne <michael dot pyne at kdemail net> /* Copyright (C) 2004-2005 Michael Pyne <michael dot pyne at kdemail net>
* Copyright (C) 2004-2006 Chris Lee <clee at kde org> * Copyright (C) 2004-2006 Chris Lee <clee at kde org>
* Copyright (C) 2007 Brian Koropoff <bkoropoff at gmail com>
* *
* This library is free software; you can redistribute it and/or * This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public * modify it under the terms of the GNU Library General Public
@ -24,6 +25,8 @@
#include <openspc.h> #include <openspc.h>
#include "tag.h"
G_BEGIN_DECLS G_BEGIN_DECLS
#define GST_TYPE_SPC_DEC \ #define GST_TYPE_SPC_DEC \
@ -49,6 +52,12 @@ struct _GstSpcDec
GstBuffer *buf; GstBuffer *buf;
gboolean initialized; gboolean initialized;
gboolean seeking;
guint32 seekpoint;
spc_tag_info tag_info;
guint32 byte_pos;
}; };
struct _GstSpcDecClass struct _GstSpcDecClass

353
ext/spc/tag.c Normal file
View file

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

37
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/* Copyright (C) 2007 Brian Koropoff <bkoropoff at gmail com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include <glib/gtypes.h>
#include <glib.h>
typedef struct
{
gchar *title, *game, *artist, *album, *publisher;
gchar *dumper, *comment;
enum { EMU_SNES9X = 2, EMU_ZSNES = 1, EMU_UNKNOWN = 0 } emulator;
guint8 track, disc, muted, loop_count;
guint16 year;
guint32 time_seconds, time_fade_milliseconds;
guint32 time_intro, time_loop, time_end, time_fade;
guint32 amplification;
GDate *dump_date;
} spc_tag_info;
void spc_tag_clear(spc_tag_info* info);
void spc_tag_get_info(guchar* data, guint length, spc_tag_info* info);
void spc_tag_free(spc_tag_info* info);