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dvdemux: Fix detection of new media

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There are 5 or 6 AAUX source control packs in a frame, and any
of them could have REC_ST cleared, indicating a recording start
point.  libdv only checks the first.
This commit is contained in:
David Schleef 2009-09-13 12:01:27 -07:00
parent b1dab0fce1
commit 1b57f19509
2 changed files with 33 additions and 1 deletions
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33
ext/dv/gstdvdemux.c
View file

@ -1356,6 +1356,31 @@ gst_dvdemux_demux_video (GstDVDemux * dvdemux, GstBuffer * buffer,
return ret;
}
static gboolean
gst_dvdemux_is_new_media (GstDVDemux * dvdemux, GstBuffer * buffer)
{
guint8 *data = GST_BUFFER_DATA (buffer);
int aaux_offset;
int dif;
int n_difs;
n_difs = dvdemux->PAL ? 12 : 10;
for (dif = 0; dif < n_difs; dif++) {
if (dif & 1) {
aaux_offset = (dif * 12000) + (6 + 16 * 1) * 80 + 3;
} else {
aaux_offset = (dif * 12000) + (6 + 16 * 4) * 80 + 3;
}
if (data[aaux_offset + 0] == 0x51) {
if ((data[aaux_offset + 2] & 0x80) == 0)
return TRUE;
}
}
return FALSE;
}
/* takes ownership of buffer */
static GstFlowReturn
gst_dvdemux_demux_frame (GstDVDemux * dvdemux, GstBuffer * buffer)
@ -1410,7 +1435,13 @@ gst_dvdemux_demux_frame (GstDVDemux * dvdemux, GstBuffer * buffer)
data = GST_BUFFER_DATA (buffer);
dv_parse_packs (dvdemux->decoder, data);
dvdemux->new_media = dv_is_new_recording (dvdemux->decoder, data);
dvdemux->new_media = FALSE;
if (gst_dvdemux_is_new_media (dvdemux, buffer) &&
dvdemux->frames_since_new_media > 2) {
dvdemux->new_media = TRUE;
dvdemux->frames_since_new_media = 0;
}
dvdemux->frames_since_new_media++;
/* does not take ownership of buffer */
aret = ret = gst_dvdemux_demux_audio (dvdemux, buffer, duration);

1
ext/dv/gstdvdemux.h
View file

@ -80,6 +80,7 @@ struct _GstDVDemux {
gboolean running;
gboolean need_segment;
gboolean new_media;
int frames_since_new_media;
gint found_header; /* ATOMIC */
GstEvent *seek_event;