1 files changed, 244 insertions, 0 deletions
diff --git a/src/decoder/gme_decoder_plugin.c b/src/decoder/gme_decoder_plugin.c
new file mode 100644
index 000000000..4a5220a3f
--- /dev/null
+++ b/src/decoder/gme_decoder_plugin.c
@@ -0,0 +1,244 @@
+#include "config.h"
+#include "../decoder_api.h"
+#include "audio_check.h"
+#include "uri.h"
+
+#include <glib.h>
+#include <assert.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <gme/gme.h>
+
+#undef G_LOG_DOMAIN
+#define G_LOG_DOMAIN "gme"
+
+#define SUBTUNE_PREFIX "tune_"
+
+enum {
+	GME_SAMPLE_RATE = 44100,
+	GME_CHANNELS = 2,
+	GME_BUFFER_FRAMES = 2048,
+	GME_BUFFER_SAMPLES = GME_BUFFER_FRAMES * GME_CHANNELS,
+};
+
+/**
+ * returns the file path stripped of any /tune_xxx.* subtune
+ * suffix
+ */
+static char *
+get_container_name(const char *path_fs)
+{
+	const char *subtune_suffix = uri_get_suffix(path_fs);
+	char *path_container = g_strdup(path_fs);
+	char *pat = g_strconcat("*/" SUBTUNE_PREFIX "???.", subtune_suffix, NULL);
+	GPatternSpec *path_with_subtune = g_pattern_spec_new(pat);
+	g_free(pat);
+	if (!g_pattern_match(path_with_subtune,
+			     strlen(path_container), path_container, NULL)) {
+		g_pattern_spec_free(path_with_subtune);
+		return path_container;
+	}
+
+	char *ptr = g_strrstr(path_container, "/" SUBTUNE_PREFIX);
+	if (ptr != NULL)
+		*ptr='\0';
+
+	g_pattern_spec_free(path_with_subtune);
+	return path_container;
+}
+
+/**
+ * returns tune number from file.nsf/tune_xxx.* style path or 0 if no subtune
+ * is appended.
+ */
+static int
+get_song_num(const char *path_fs)
+{
+	const char *subtune_suffix = uri_get_suffix(path_fs);
+	char *pat = g_strconcat("*/" SUBTUNE_PREFIX "???.", subtune_suffix, NULL);
+	GPatternSpec *path_with_subtune = g_pattern_spec_new(pat);
+	g_free(pat);
+
+	if (g_pattern_match(path_with_subtune,
+			    strlen(path_fs), path_fs, NULL)) {
+		char *sub = g_strrstr(path_fs, "/" SUBTUNE_PREFIX);
+		g_pattern_spec_free(path_with_subtune);
+		if(!sub)
+			return 0;
+
+		sub += strlen("/" SUBTUNE_PREFIX);
+		int song_num = strtol(sub, NULL, 10);
+
+		return song_num - 1;
+	} else {
+		g_pattern_spec_free(path_with_subtune);
+		return 0;
+	}
+}
+
+static char *
+gme_container_scan(const char *path_fs, const unsigned int tnum)
+{
+	Music_Emu *emu;
+	const char* gme_err;
+	unsigned int num_songs;
+
+	gme_err = gme_open_file(path_fs, &emu, GME_SAMPLE_RATE);
+	if (gme_err != NULL) {
+		g_warning("%s", gme_err);
+		return NULL;
+	}
+
+	num_songs = gme_track_count(emu);
+	/* if it only contains a single tune, don't treat as container */
+	if (num_songs < 2)
+		return NULL;
+
+	const char *subtune_suffix = uri_get_suffix(path_fs);
+	if (tnum <= num_songs){
+		char *subtune = g_strdup_printf(
+			SUBTUNE_PREFIX "%03u.%s", tnum, subtune_suffix);
+		return subtune;
+	} else
+		return NULL;
+}
+
+static void
+gme_file_decode(struct decoder *decoder, const char *path_fs)
+{
+	float song_len;
+	Music_Emu *emu;
+	gme_info_t *ti;
+	struct audio_format audio_format;
+	enum decoder_command cmd;
+	short buf[GME_BUFFER_SAMPLES];
+	const char* gme_err;
+	char *path_container = get_container_name(path_fs);
+	int song_num = get_song_num(path_fs);
+
+	gme_err = gme_open_file(path_container, &emu, GME_SAMPLE_RATE);
+	g_free(path_container);
+	if (gme_err != NULL) {
+		g_warning("%s", gme_err);
+		return;
+	}
+
+	if((gme_err = gme_track_info(emu, &ti, song_num)) != NULL){
+		g_warning("%s", gme_err);
+		gme_delete(emu);
+		return;
+	}
+
+	if(ti->length > 0)
+		song_len = ti->length / 1000.0;
+	else song_len = -1;
+
+	/* initialize the MPD decoder */
+
+	GError *error = NULL;
+	if (!audio_format_init_checked(&audio_format, GME_SAMPLE_RATE,
+				       SAMPLE_FORMAT_S16, GME_CHANNELS,
+				       &error)) {
+		g_warning("%s", error->message);
+		g_error_free(error);
+		gme_free_info(ti);
+		gme_delete(emu);
+		return;
+	}
+
+	decoder_initialized(decoder, &audio_format, true, song_len);
+
+	if((gme_err = gme_start_track(emu, song_num)) != NULL)
+		g_warning("%s", gme_err);
+
+	/* play */
+	do {
+		gme_err = gme_play(emu, GME_BUFFER_SAMPLES, buf);
+		if (gme_err != NULL) {
+			g_warning("%s", gme_err);
+			return;
+		}
+		cmd = decoder_data(decoder, NULL, buf, sizeof(buf), 0);
+
+		if(cmd == DECODE_COMMAND_SEEK) {
+			float where = decoder_seek_where(decoder);
+			if((gme_err = gme_seek(emu, (int)where*1000)) != NULL)
+				g_warning("%s", gme_err);
+			decoder_command_finished(decoder);
+		}
+
+		if(gme_track_ended(emu))
+			break;
+	} while(cmd != DECODE_COMMAND_STOP);
+
+	gme_free_info(ti);
+	gme_delete(emu);
+}
+
+static struct tag *
+gme_tag_dup(const char *path_fs)
+{
+	Music_Emu *emu;
+	gme_info_t *ti;
+	const char* gme_err;
+	char *path_container=get_container_name(path_fs);
+	int song_num;
+	song_num=get_song_num(path_fs);
+
+	gme_err = gme_open_file(path_container, &emu, GME_SAMPLE_RATE);
+	g_free(path_container);
+	if (gme_err != NULL) {
+		g_warning("%s", gme_err);
+		return NULL;
+	}
+	if((gme_err = gme_track_info(emu, &ti, song_num)) != NULL){
+		g_warning("%s", gme_err);
+		gme_delete(emu);
+		return NULL;
+	}
+
+	struct tag *tag = tag_new();
+	if(ti != NULL){
+		if(ti->length > 0)
+			tag->time = ti->length / 1000;
+		if(ti->song != NULL){
+			if(gme_track_count(emu) > 1){
+				/* start numbering subtunes from 1 */
+				char *tag_title=g_strdup_printf("%s (%d/%d)",
+					ti->song, song_num+1, gme_track_count(emu));
+				tag_add_item(tag, TAG_TITLE, tag_title);
+				g_free(tag_title);
+			}else
+				tag_add_item(tag, TAG_TITLE, ti->song);
+		}
+		if(ti->author != NULL)
+			tag_add_item(tag, TAG_ARTIST, ti->author);
+		if(ti->game != NULL)
+			tag_add_item(tag, TAG_ALBUM, ti->game);
+		if(ti->comment != NULL)
+			tag_add_item(tag, TAG_COMMENT, ti->comment);
+		if(ti->copyright != NULL)
+			tag_add_item(tag, TAG_DATE, ti->copyright);
+	}
+
+	gme_free_info(ti);
+	gme_delete(emu);
+	return tag;
+}
+
+static const char *const gme_suffixes[] = {
+	"ay", "gbs", "gym", "hes", "kss", "nsf",
+	"nsfe", "sap", "spc", "vgm", "vgz",
+	NULL
+};
+
+extern const struct decoder_plugin gme_decoder_plugin;
+const struct decoder_plugin gme_decoder_plugin = {
+	.name = "gme",
+	.file_decode = gme_file_decode,
+	.tag_dup = gme_tag_dup,
+	.suffixes = gme_suffixes,
+	.container_scan = gme_container_scan,
+};