[FFmpeg-devel] [PATCH 3/4] avutil/timecode: add function av_timecode_get_smpte_by_tc_string()

[lance.lmwang at gmail.com]

From: Limin Wang <lance.lmwang at gmail.com>

Signed-off-by: Limin Wang <lance.lmwang at gmail.com>
---
 libavutil/timecode.c | 26 ++++++++++++++++++++++++++
 libavutil/timecode.h |  9 +++++++++
 2 files changed, 35 insertions(+)

diff --git a/libavutil/timecode.c b/libavutil/timecode.c
index 60077ba..7a7ed1d 100644
--- a/libavutil/timecode.c
+++ b/libavutil/timecode.c
@@ -81,6 +81,32 @@ uint32_t av_timecode_get_smpte_from_framenum(const AVTimecode *tc, int framenum)
            (hh % 10);        // units of hours
 }
 
+uint32_t av_timecode_get_smpte_by_tc_string(const char *buf)
+{
+    char c;
+    int hh, mm, ss, ff, drop;
+
+    if (sscanf(buf, "%d:%d:%d%c%d", &hh, &mm, &ss, &c, &ff) != 5) {
+        return AVERROR_INVALIDDATA;
+    }
+    drop = c != ':' ? AV_TIMECODE_FLAG_DROPFRAME : 0; // drop if ';', '.', ...
+
+    return 0         << 31 | // color frame flag (0: unsync mode, 1: sync mode)
+           drop      << 30 | // drop  frame flag (0: non drop,    1: drop)
+           (ff / 10) << 28 | // tens  of frames
+           (ff % 10) << 24 | // units of frames
+           0         << 23 | // PC (NTSC) or BGF0 (PAL)
+           (ss / 10) << 20 | // tens  of seconds
+           (ss % 10) << 16 | // units of seconds
+           0         << 15 | // BGF0 (NTSC) or BGF2 (PAL)
+           (mm / 10) << 12 | // tens  of minutes
+           (mm % 10) <<  8 | // units of minutes
+           0         <<  7 | // BGF2 (NTSC) or PC (PAL)
+           0         <<  6 | // BGF1
+           (hh / 10) <<  4 | // tens  of hours
+           (hh % 10);        // units of hours
+}
+
 char *av_timecode_make_string(const AVTimecode *tc, char *buf, int framenum)
 {
     int fps = tc->fps;
diff --git a/libavutil/timecode.h b/libavutil/timecode.h
index 37c1361..7bb4b78 100644
--- a/libavutil/timecode.h
+++ b/libavutil/timecode.h
@@ -71,6 +71,15 @@ int av_timecode_adjust_ntsc_framenum2(int framenum, int fps);
 uint32_t av_timecode_get_smpte_from_framenum(const AVTimecode *tc, int framenum);
 
 /**
+ * Convert TC string to SMPTE 12M binary representation.
+ *
+ * @param buf      TC string
+ * @return         the SMPTE binary representation, or AVERROR otherwise
+ *
+ */
+uint32_t av_timecode_get_smpte_by_tc_string(const char *buf);
+
+/**
  * Load timecode string in buf.
  *
  * @param buf      destination buffer, must be at least AV_TIMECODE_STR_SIZE long
-- 
1.8.3.1