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dvdemux: Parse SMPTE time codes

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This commit is contained in:
David Schleef 2010-06-04 12:09:23 -07:00
parent f35d546c71
commit 75d0795e53
3 changed files with 57 additions and 1 deletions
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2
ext/dv/Makefile.am
View file

@ -1,6 +1,6 @@
plugin_LTLIBRARIES = libgstdv.la
libgstdv_la_SOURCES = gstdv.c gstdvdec.c gstdvdemux.c
libgstdv_la_SOURCES = gstdv.c gstdvdec.c gstdvdemux.c gstsmptetimecode.c
libgstdv_la_CFLAGS = $(GST_PLUGINS_BASE_CFLAGS) $(GST_BASE_CFLAGS) $(GST_CFLAGS) $(LIBDV_CFLAGS)
libgstdv_la_LIBADD = \
$(GST_PLUGINS_BASE_LIBS) -lgstaudio-$(GST_MAJORMINOR) \

51
ext/dv/gstdvdemux.c
View file

@ -26,6 +26,7 @@
#include <gst/audio/audio.h>
#include "gstdvdemux.h"
#include "gstsmptetimecode.h"
/**
* SECTION:element-dvdemux
@ -1357,6 +1358,48 @@ gst_dvdemux_demux_video (GstDVDemux * dvdemux, GstBuffer * buffer,
return ret;
}
static int
get_ssyb_offset (int dif, int ssyb)
{
int offset;
offset = dif * 12000; /* to dif */
offset += 80 * (1 + (ssyb / 6)); /* to subcode pack */
offset += 3; /* past header */
offset += 8 * (ssyb % 6); /* to ssyb */
return offset;
}
static gboolean
gst_dvdemux_get_timecode (GstDVDemux * dvdemux, GstBuffer * buffer,
GstSMPTETimeCode * timecode)
{
guint8 *data = GST_BUFFER_DATA (buffer);
int offset;
int dif;
int n_difs = dvdemux->decoder->num_dif_seqs;
for (dif = 0; dif < n_difs; dif++) {
offset = get_ssyb_offset (dif, 3);
if (data[offset + 3] == 0x13) {
timecode->frames = ((data[offset + 4] >> 4) & 0x3) * 10 +
(data[offset + 4] & 0xf);
timecode->seconds = ((data[offset + 5] >> 4) & 0x3) * 10 +
(data[offset + 5] & 0xf);
timecode->minutes = ((data[offset + 6] >> 4) & 0x3) * 10 +
(data[offset + 6] & 0xf);
timecode->hours = ((data[offset + 7] >> 4) & 0x3) * 10 +
(data[offset + 7] & 0xf);
GST_DEBUG ("got timecode %" GST_SMPTE_TIME_CODE_FORMAT,
GST_SMPTE_TIME_CODE_ARGS (timecode));
return TRUE;
}
}
return FALSE;
}
static gboolean
gst_dvdemux_is_new_media (GstDVDemux * dvdemux, GstBuffer * buffer)
{
@ -1390,6 +1433,8 @@ gst_dvdemux_demux_frame (GstDVDemux * dvdemux, GstBuffer * buffer)
GstFlowReturn aret, vret, ret;
guint8 *data;
guint64 duration;
GstSMPTETimeCode timecode;
int frame_number;
if (G_UNLIKELY (dvdemux->need_segment)) {
GstEvent *event;
@ -1428,6 +1473,12 @@ gst_dvdemux_demux_frame (GstDVDemux * dvdemux, GstBuffer * buffer)
dvdemux->need_segment = FALSE;
}
gst_dvdemux_get_timecode (dvdemux, buffer, &timecode);
gst_smpte_time_code_get_frame_number (
(dvdemux->decoder->system == e_dv_system_625_50) ?
GST_SMPTE_TIME_CODE_SYSTEM_25 : GST_SMPTE_TIME_CODE_SYSTEM_30,
&frame_number, &timecode);
next_ts = gst_util_uint64_scale_int (
(dvdemux->frame_offset + 1) * GST_SECOND,
dvdemux->framerate_denominator, dvdemux->framerate_numerator);

5
ext/dv/gstsmptetimecode.h
View file

@ -50,6 +50,11 @@ struct _GstSMPTETimeCode {
#define GST_SMPTE_TIME_CODE_SYSTEM_IS_VALID(x) \
((x) >= GST_SMPTE_TIME_CODE_SYSTEM_30 && (x) <= GST_SMPTE_TIME_CODE_SYSTEM_24)
#define GST_SMPTE_TIME_CODE_FORMAT "02d:%02d:%02d:%02d"
#define GST_SMPTE_TIME_CODE_ARGS(timecode) \
(timecode)->hours, (timecode)->minutes, \
(timecode)->seconds, (timecode)->frames
gboolean gst_smpte_time_code_is_valid (GstSMPTETimeCodeSystem system,
GstSMPTETimeCode *time_code);
gboolean gst_smpte_time_code_from_frame_number (GstSMPTETimeCodeSystem system,