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Diffstat (limited to 'deps/flac-1.3.2/src/share/grabbag/seektable.c')
-rw-r--r--deps/flac-1.3.2/src/share/grabbag/seektable.c106
1 files changed, 106 insertions, 0 deletions
diff --git a/deps/flac-1.3.2/src/share/grabbag/seektable.c b/deps/flac-1.3.2/src/share/grabbag/seektable.c
new file mode 100644
index 0000000..01118d5
--- /dev/null
+++ b/deps/flac-1.3.2/src/share/grabbag/seektable.c
@@ -0,0 +1,106 @@
+/* grabbag - Convenience lib for various routines common to several tools
+ * Copyright (C) 2002-2009 Josh Coalson
+ * Copyright (C) 2011-2016 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, unsigned sample_rate, FLAC__StreamMetadata *seektable_template, FLAC__bool *spec_has_real_points)
+{
+ unsigned 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 = (unsigned)atoi(pt);
+ if(n > 0)
+ if(!FLAC__metadata_object_seektable_template_append_spaced_points(seektable_template, (unsigned)n, total_samples_to_encode))
+ return false;
+ }
+ }
+ }
+ else if(q[-1] == 's') { /* -S #s */
+ if(total_samples_to_encode > 0) { /* we can only do these if we know the number of samples to encode up front */
+ FLAC__ASSERT(sample_rate > 0);
+ if(0 != spec_has_real_points)
+ *spec_has_real_points = true;
+ if(!only_explicit_placeholders) {
+ const double sec = atof(pt);
+ if(sec > 0.0) {
+ unsigned samples = (unsigned)(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;
+}