From f4cb76e92dc78bdde3dd9be49fc921111a94ee0a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sebastian=20Dr=C3=B6ge?= <slomo@circular-chaos.org>
Date: Sat, 6 Dec 2008 19:46:05 +0000
Subject: gst/mxf/mxfd10.c: Document decoding of the AES3 data and also skip
the 32 bit header in the beginning of every buffer...
Original commit message from CVS:
* gst/mxf/mxfd10.c: (mxf_d10_sound_handle_essence_element):
Document decoding of the AES3 data and also skip the 32 bit
header in the beginning of every buffer, otherwise we get
one broken audio channel.
---
gst/mxf/mxfd10.c | 8 ++++++++
1 file changed, 8 insertions(+)
(limited to 'gst/mxf')
diff --git a/gst/mxf/mxfd10.c b/gst/mxf/mxfd10.c
index 75e74008..d8d19099 100644
--- a/gst/mxf/mxfd10.c
+++ b/gst/mxf/mxfd10.c
@@ -118,10 +118,16 @@ mxf_d10_sound_handle_essence_element (const MXFUL * key, GstBuffer * buffer,
indata = GST_BUFFER_DATA (buffer);
outdata = GST_BUFFER_DATA (*outbuf);
+ /* Skip 32 bit header */
+ indata += 4;
+
for (i = 0; i < nsamples; i++) {
for (j = 0; j < channels; j++) {
guint32 in = GST_READ_UINT32_LE (indata);
+ /* Remove first 4 and last 4 bits as they only
+ * contain status data. Shift the 24 bit samples
+ * to the correct width afterwards. */
if (width == 2) {
in = (in >> 12) & 0xffff;
GST_WRITE_UINT16_LE (outdata, in);
@@ -132,6 +138,8 @@ mxf_d10_sound_handle_essence_element (const MXFUL * key, GstBuffer * buffer,
indata += 4;
outdata += width;
}
+ /* There are always 8 channels but only the first
+ * ones contain valid data, skip the others */
indata += 4 * (8 - channels);
}
--
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