Adding upstream version 1.4.3+ds.upstream/1.4.3+dsupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 105 insertions, 0 deletions

diff --git a/src/share/grabbag/seektable.c b/src/share/grabbag/seektable.c
new file mode 100644
index 0000000..01caa99
--- /dev/null
+++ b/src/share/grabbag/seektable.c
@@ -0,0 +1,105 @@
+/* grabbag - Convenience lib for various routines common to several tools
+ * Copyright (C) 2002-2009  Josh Coalson
+ * Copyright (C) 2011-2023  Xiph.Org Foundation
+ *
+ * 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 HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
+#include "share/grabbag.h"
+#include "share/compat.h"
+#include "FLAC/assert.h"
+#include <stdlib.h> /* for atoi() */
+#include <string.h>
+
+FLAC__bool grabbag__seektable_convert_specification_to_template(const char *spec, FLAC__bool only_explicit_placeholders, FLAC__uint64 total_samples_to_encode, uint32_t sample_rate, FLAC__StreamMetadata *seektable_template, FLAC__bool *spec_has_real_points)
+{
+	uint32_t i;
+	const char *pt;
+
+	FLAC__ASSERT(0 != spec);
+	FLAC__ASSERT(0 != seektable_template);
+	FLAC__ASSERT(seektable_template->type == FLAC__METADATA_TYPE_SEEKTABLE);
+
+	if(0 != spec_has_real_points)
+		*spec_has_real_points = false;
+
+	for(pt = spec, i = 0; pt && *pt; i++) {
+		const char *q = strchr(pt, ';');
+		FLAC__ASSERT(0 != q);
+
+		if(q > pt) {
+			if(0 == strncmp(pt, "X;", 2)) { /* -S X */
+				if(!FLAC__metadata_object_seektable_template_append_placeholders(seektable_template, 1))
+					return false;
+			}
+			else if(q[-1] == 'x') { /* -S #x */
+				if(total_samples_to_encode > 0) { /* we can only do these if we know the number of samples to encode up front */
+					if(0 != spec_has_real_points)
+						*spec_has_real_points = true;
+					if(!only_explicit_placeholders) {
+						const int n = (uint32_t)atoi(pt);
+						if(n > 0)
+							if(!FLAC__metadata_object_seektable_template_append_spaced_points(seektable_template, (uint32_t)n, total_samples_to_encode))
+								return false;
+					}
+				}
+			}
+			else if(q[-1] == 's') { /* -S #s */
+				if(total_samples_to_encode > 0 && sample_rate > 0) { /* we can only do these if we know the number of samples and sample rate to encode up front */
+					if(0 != spec_has_real_points)
+						*spec_has_real_points = true;
+					if(!only_explicit_placeholders) {
+						const double sec = atof(pt);
+						if(sec > 0.0) {
+							uint32_t samples = (uint32_t)(sec * (double)sample_rate);
+							/* Restrict seekpoints to two per second of audio. */
+							samples = samples < sample_rate / 2 ? sample_rate / 2 : samples;
+							if(samples > 0) {
+								/* +1 for the initial point at sample 0 */
+								if(!FLAC__metadata_object_seektable_template_append_spaced_points_by_samples(seektable_template, samples, total_samples_to_encode))
+									return false;
+							}
+						}
+					}
+				}
+			}
+			else { /* -S # */
+				if(0 != spec_has_real_points)
+					*spec_has_real_points = true;
+				if(!only_explicit_placeholders) {
+					char *endptr;
+					const FLAC__int64 n = (FLAC__int64)strtoll(pt, &endptr, 10);
+					if(
+						(n > 0 || (endptr > pt && *endptr == ';')) && /* is a valid number (extra check needed for "0") */
+						(total_samples_to_encode == 0 || (FLAC__uint64)n < total_samples_to_encode) /* number is not >= the known total_samples_to_encode */
+					)
+						if(!FLAC__metadata_object_seektable_template_append_point(seektable_template, (FLAC__uint64)n))
+							return false;
+				}
+			}
+		}
+
+		pt = ++q;
+	}
+
+	if(!FLAC__metadata_object_seektable_template_sort(seektable_template, /*compact=*/true))
+		return false;
+
+	return true;
+}