timecode: introduce timecode and honor it in MPEG-1/2.

This is based on the original work by Baptiste Coudurier.

1 files changed, 58 insertions, 0 deletions

diff --git a/libavcodec/timecode.h b/libavcodec/timecode.h
new file mode 100644
index 0000000000..d2f66065d9
--- /dev/null
+++ b/libavcodec/timecode.h
@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2006 Smartjog S.A.S, Baptiste Coudurier <baptiste.coudurier@gmail.com>
+ * Copyright (C) 2011 Smartjog S.A.S, Clément Bœsch      <clement.boesch@smartjog.com>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation;
+ * version 2 of the License.
+ *
+ * FFmpeg 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
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * Timecode helpers header
+ */
+
+#ifndef AVCODEC_TIMECODE_H
+#define AVCODEC_TIMECODE_H
+
+#include <stdint.h>
+#include "libavutil/rational.h"
+
+#define TIMECODE_OPT(ctx, flags)                                         \
+    "timecode", "set timecode value following hh:mm:ss[:;.]ff format, "  \
+                "use ';' or '.' before frame number for drop frame",     \
+    offsetof(ctx, tc.str),                                               \
+    FF_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, flags
+
+struct ff_timecode {
+    char *str;       ///< string following the hh:mm:ss[:;.]ff format
+    int start;       ///< timecode frame start
+    int drop;        ///< drop flag (1 if drop, else 0)
+    AVRational rate; ///< Frame rate in rationnal form
+};
+
+/**
+ * Parse SMTPE 12M time representation (hh:mm:ss[:;.]ff). str and rate fields
+ * from tc struct must be set.
+ *
+ * @param avcl A pointer to an arbitrary struct of which the first field is a
+ *             pointer to an AVClass struct (used for av_log).
+ * @param tc   Timecode struct pointer
+ * @return     0 on success, negative value on failure
+ * @warning    Adjustement is only valid in NTSC 29.97
+ */
+int ff_init_smtpe_timecode(void *avcl, struct ff_timecode *tc);
+
+#endif /* AVCODEC_TIMECODE_H */