gstreamer/subprojects/gst-plugins-bad/gst/mxf/mxfvanc.c
Edward Hervey 80e83089b5 mxfvanc: Handle empty VANC packets
Some XDCAM recorders store empty packets for VANC, and don't even include the
2byte length.

Handle them in the same way as VANC packets with 0 packets.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/2122>
2022-04-06 10:05:09 +00:00

457 lines
13 KiB
C

/* GStreamer
* Copyright (C) 2020 Sebastian Dröge <sebastian@centricular.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/* Implementation of SMPTE 436M - MXF Mappings for VBI Lines
* and Ancillary Data Packets
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
#include <gst/base/base.h>
#include <gst/video/video.h>
#include <string.h>
#include "mxfvanc.h"
#include "mxfessence.h"
GST_DEBUG_CATEGORY_EXTERN (mxf_debug);
#define GST_CAT_DEFAULT mxf_debug
/* SMPTE S436M 7 */
#define MXF_TYPE_METADATA_VANC_DESCRIPTOR \
(mxf_metadata_vanc_descriptor_get_type())
#define MXF_METADATA_VANC_DESCRIPTOR(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj),MXF_TYPE_METADATA_VANC_DESCRIPTOR, MXFMetadataVANCDescriptor))
#define MXF_IS_METADATA_VANC_DESCRIPTOR(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj),MXF_TYPE_METADATA_VANC_DESCRIPTOR))
typedef struct _MXFMetadataVANCDescriptor MXFMetadataVANCDescriptor;
typedef MXFMetadataClass MXFMetadataVANCDescriptorClass;
GType mxf_metadata_vanc_descriptor_get_type (void);
struct _MXFMetadataVANCDescriptor
{
MXFMetadataGenericDataEssenceDescriptor parent;
};
G_DEFINE_TYPE (MXFMetadataVANCDescriptor,
mxf_metadata_vanc_descriptor,
MXF_TYPE_METADATA_GENERIC_DATA_ESSENCE_DESCRIPTOR);
static void
mxf_metadata_vanc_descriptor_init (MXFMetadataVANCDescriptor * self)
{
}
static void
mxf_metadata_vanc_descriptor_class_init
(MXFMetadataVANCDescriptorClass * klass)
{
MXFMetadataClass *metadata_class = (MXFMetadataClass *) klass;
metadata_class->type = 0x015c;
}
static gboolean
mxf_is_vanc_essence_track (const MXFMetadataTimelineTrack * track)
{
guint i;
g_return_val_if_fail (track != NULL, FALSE);
if (track->parent.descriptor == NULL)
return FALSE;
for (i = 0; i < track->parent.n_descriptor; i++) {
MXFMetadataFileDescriptor *d = track->parent.descriptor[i];
MXFUL *key;
if (!d)
continue;
key = &d->essence_container;
/* SMPTE 436M 4.3 */
if (mxf_is_generic_container_essence_container_label (key) &&
key->u[12] == 0x02 && key->u[13] == 0x0e &&
key->u[14] == 0x00 && key->u[15] == 0x00)
return TRUE;
}
return FALSE;
}
static GstFlowReturn
mxf_vanc_handle_essence_element (const MXFUL * key, GstBuffer * buffer,
GstCaps * caps,
MXFMetadataTimelineTrack * track,
gpointer mapping_data, GstBuffer ** outbuf)
{
GstMapInfo map;
GstByteReader reader;
GstFlowReturn ret = GST_FLOW_ERROR;
guint16 num_packets, i;
/* SMPTE 436M 6.1 */
if (key->u[12] != 0x17 || key->u[14] != 0x02) {
GST_ERROR ("Invalid VANC essence element");
gst_buffer_unref (buffer);
return GST_FLOW_ERROR;
}
/* Either there is no data or there is at least room for the 16bit length,
* therefore the only invalid packet length is 1 */
if (gst_buffer_get_size (buffer) == 1) {
GST_ERROR ("Invalid VANC essence element size");
gst_buffer_unref (buffer);
return GST_FLOW_ERROR;
}
gst_buffer_map (buffer, &map, GST_MAP_READ);
gst_byte_reader_init (&reader, map.data, map.size);
/* Some XDCAM recorders store empty vanc packets (without even the
* length). Treat them as gaps */
if (map.size == 0)
goto no_data;
num_packets = gst_byte_reader_get_uint16_be_unchecked (&reader);
if (num_packets == 0) {
/* SMPTE 436-1:2013 5.5 The Number of VI Lines or ANC Packets Property
*
* One of the properties in the VI Element is the “Number of Lines” which is
* the number of the VI lines contained in this VI Element. This number can
* be zero if the current VI Element does not have any VI lines in the
* payload space. This capability can be used so every Content Package in a
* file can have a VI Element even if the video stream does not have VI
* lines with every frame (or field.)
*
* The same scheme can be used for ANC packets.
*/
goto no_data;
}
for (i = 0; i < num_packets; i++) {
G_GNUC_UNUSED guint16 line_num;
G_GNUC_UNUSED guint8 wrapping_type;
guint8 payload_sample_coding;
guint16 payload_sample_count;
guint32 array_count;
guint32 array_item_size;
guint8 did, sdid;
guint8 cdp_size;
if (gst_byte_reader_get_remaining (&reader) < 16)
goto out;
line_num = gst_byte_reader_get_uint16_be_unchecked (&reader);
wrapping_type = gst_byte_reader_get_uint8_unchecked (&reader);
payload_sample_coding = gst_byte_reader_get_uint8_unchecked (&reader);
payload_sample_count = gst_byte_reader_get_uint16_be_unchecked (&reader);
array_count = gst_byte_reader_get_uint32_be_unchecked (&reader);
array_item_size = gst_byte_reader_get_uint32_be_unchecked (&reader);
/* Skip over anything that is not 8 bit VANC */
if (payload_sample_coding != 4 && payload_sample_coding != 5
&& payload_sample_coding != 6) {
if (!gst_byte_reader_skip (&reader, array_count * array_item_size))
goto out;
continue;
}
if (gst_byte_reader_get_remaining (&reader) < array_count * array_item_size)
goto out;
if (gst_byte_reader_get_remaining (&reader) < payload_sample_count)
goto out;
if (payload_sample_count < 2) {
if (!gst_byte_reader_skip (&reader, array_count * array_item_size))
goto out;
continue;
}
did = gst_byte_reader_get_uint8_unchecked (&reader);
sdid = gst_byte_reader_get_uint8_unchecked (&reader);
/* Not S334 EIA-708 */
if (did != 0x61 && sdid != 0x01) {
GST_TRACE ("Skipping VANC data with DID/SDID 0x%02X/0x%02X", did, sdid);
if (!gst_byte_reader_skip (&reader, array_count * array_item_size - 2))
goto out;
continue;
}
if (payload_sample_count < 2) {
if (!gst_byte_reader_skip (&reader, array_count * array_item_size - 2))
goto out;
continue;
}
cdp_size = gst_byte_reader_get_uint8_unchecked (&reader);
if (payload_sample_count - 3 < cdp_size) {
if (!gst_byte_reader_skip (&reader, array_count * array_item_size - 3))
goto out;
continue;
}
gst_buffer_unmap (buffer, &map);
*outbuf =
gst_buffer_copy_region (buffer, GST_BUFFER_COPY_ALL,
gst_byte_reader_get_pos (&reader), cdp_size);
gst_buffer_unref (buffer);
return GST_FLOW_OK;
}
no_data:
/* No packets or we skipped over all packets */
*outbuf = gst_buffer_new ();
GST_BUFFER_FLAG_SET (*outbuf, GST_BUFFER_FLAG_GAP);
ret = GST_FLOW_OK;
out:
gst_buffer_unmap (buffer, &map);
gst_buffer_unref (buffer);
return ret;
}
static MXFEssenceWrapping
mxf_vanc_get_track_wrapping (const MXFMetadataTimelineTrack * track)
{
g_return_val_if_fail (track != NULL, MXF_ESSENCE_WRAPPING_CUSTOM_WRAPPING);
if (track->parent.descriptor == NULL) {
GST_ERROR ("No descriptor found for this track");
return MXF_ESSENCE_WRAPPING_CUSTOM_WRAPPING;
}
return MXF_ESSENCE_WRAPPING_FRAME_WRAPPING;
}
static GstCaps *
mxf_vanc_create_caps (MXFMetadataTimelineTrack * track, GstTagList ** tags,
gboolean * intra_only, MXFEssenceElementHandleFunc * handler,
gpointer * mapping_data)
{
GstCaps *caps = NULL;
guint i;
MXFMetadataFileDescriptor *f = NULL;
MXFMetadataVANCDescriptor *p = NULL;
g_return_val_if_fail (track != NULL, NULL);
if (track->parent.descriptor == NULL) {
GST_ERROR ("No descriptor found for this track");
return NULL;
}
for (i = 0; i < track->parent.n_descriptor; i++) {
if (!track->parent.descriptor[i])
continue;
if (MXF_IS_METADATA_VANC_DESCRIPTOR (track->parent.descriptor[i])) {
p = (MXFMetadataVANCDescriptor *) track->parent.descriptor[i];
f = track->parent.descriptor[i];
break;
} else if (MXF_IS_METADATA_FILE_DESCRIPTOR (track->parent.descriptor[i]) &&
!MXF_IS_METADATA_MULTIPLE_DESCRIPTOR (track->parent.descriptor[i])) {
f = track->parent.descriptor[i];
}
}
if (!f) {
GST_ERROR ("No descriptor found for this track");
return NULL;
}
*handler = mxf_vanc_handle_essence_element;
caps =
gst_caps_new_simple ("closedcaption/x-cea-708", "format",
G_TYPE_STRING, "cdp", NULL);
if (p && p->parent.parent.sample_rate.d != 0) {
gst_caps_set_simple (caps, "framerate", GST_TYPE_FRACTION,
p->parent.parent.sample_rate.n, p->parent.parent.sample_rate.d, NULL);
}
*intra_only = TRUE;
return caps;
}
static const MXFEssenceElementHandler mxf_vanc_essence_element_handler = {
mxf_is_vanc_essence_track,
mxf_vanc_get_track_wrapping,
mxf_vanc_create_caps
};
static GstFlowReturn
mxf_vanc_write_func (GstBuffer * buffer,
gpointer mapping_data, GstAdapter * adapter, GstBuffer ** outbuf,
gboolean flush)
{
GstMapInfo map;
GstByteWriter writer;
guint8 *data;
guint size;
guint i;
guint8 checksum;
gst_buffer_map (buffer, &map, GST_MAP_READ);
size = GST_ROUND_UP_4 (map.size) + 20;
gst_byte_writer_init_with_size (&writer, size, TRUE);
gst_byte_writer_put_uint16_be_unchecked (&writer, 1);
gst_byte_writer_put_uint16_be_unchecked (&writer, 9);
gst_byte_writer_put_uint8_unchecked (&writer, 1);
gst_byte_writer_put_uint8_unchecked (&writer, 4);
gst_byte_writer_put_uint16_be_unchecked (&writer, map.size + 4);
gst_byte_writer_put_uint32_be_unchecked (&writer,
GST_ROUND_UP_4 (map.size + 4));
gst_byte_writer_put_uint32_be_unchecked (&writer, 1);
gst_byte_writer_put_uint16_be_unchecked (&writer, 0x6101);
gst_byte_writer_put_uint8_unchecked (&writer, map.size);
gst_byte_writer_put_data_unchecked (&writer, map.data, map.size);
checksum = 0x61 + 0x01 + map.size;
for (i = 0; i < map.size; i++)
checksum += map.data[i];
gst_byte_writer_put_uint8_unchecked (&writer, checksum & 0xff);
if (GST_ROUND_UP_4 (map.size) != map.size) {
gst_byte_writer_fill_unchecked (&writer, 0,
GST_ROUND_UP_4 (map.size) - map.size);
}
data = gst_byte_writer_reset_and_get_data (&writer);
gst_buffer_unmap (buffer, &map);
gst_buffer_unref (buffer);
*outbuf = gst_buffer_new_wrapped (data, size);
return GST_FLOW_OK;
}
static const guint8 vanc_essence_container_ul[] = {
0x06, 0x0e, 0x2b, 0x34, 0x04, 0x01, 0x01, 0x09,
0x0d, 0x01, 0x03, 0x01, 0x02, 0x0e, 0x00, 0x00
};
static MXFMetadataFileDescriptor *
mxf_vanc_get_descriptor (GstPadTemplate * tmpl, GstCaps * caps,
MXFEssenceElementWriteFunc * handler, gpointer * mapping_data)
{
MXFMetadataVANCDescriptor *ret;
GstStructure *s;
const gchar *format;
gint fps_n, fps_d;
s = gst_caps_get_structure (caps, 0);
if (strcmp (gst_structure_get_name (s), "closedcaption/x-cea-708") != 0 ||
!(format = gst_structure_get_string (s, "format")) ||
strcmp (format, "cdp") != 0 ||
!gst_structure_get_value (s, "framerate")) {
GST_ERROR ("Invalid caps %" GST_PTR_FORMAT, caps);
return NULL;
}
gst_structure_get_fraction (s, "framerate", &fps_n, &fps_d);
ret = (MXFMetadataVANCDescriptor *)
g_object_new (MXF_TYPE_METADATA_VANC_DESCRIPTOR, NULL);
memcpy (&ret->parent.parent.essence_container, &vanc_essence_container_ul,
16);
*handler = mxf_vanc_write_func;
return (MXFMetadataFileDescriptor *) ret;
}
static void
mxf_vanc_update_descriptor (MXFMetadataFileDescriptor * d, GstCaps * caps,
gpointer mapping_data, GstBuffer * buf)
{
return;
}
static void
mxf_vanc_get_edit_rate (MXFMetadataFileDescriptor * a, GstCaps * caps,
gpointer mapping_data, GstBuffer * buf, MXFMetadataSourcePackage * package,
MXFMetadataTimelineTrack * track, MXFFraction * edit_rate)
{
const GstStructure *s;
gint fps_n, fps_d;
s = gst_caps_get_structure (caps, 0);
if (!gst_structure_get_fraction (s, "framerate", &fps_n, &fps_d))
return;
edit_rate->n = fps_n;
edit_rate->d = fps_d;
}
static guint32
mxf_vanc_get_track_number_template (MXFMetadataFileDescriptor * a,
GstCaps * caps, gpointer mapping_data)
{
return (0x17 << 24) | (0x02 << 8);
}
static MXFEssenceElementWriter mxf_vanc_essence_element_writer = {
mxf_vanc_get_descriptor,
mxf_vanc_update_descriptor,
mxf_vanc_get_edit_rate,
mxf_vanc_get_track_number_template,
NULL,
{{0,}}
};
/**
* GstMXFMux!vanc_sink_%u:
*
* Since: 1.18
*/
void
mxf_vanc_init (void)
{
mxf_metadata_register (MXF_TYPE_METADATA_VANC_DESCRIPTOR);
mxf_essence_element_handler_register (&mxf_vanc_essence_element_handler);
mxf_vanc_essence_element_writer.pad_template =
gst_pad_template_new ("vanc_sink_%u", GST_PAD_SINK,
GST_PAD_REQUEST,
gst_caps_from_string
("closedcaption/x-cea-708, format = (string) cdp, framerate = "
GST_VIDEO_FPS_RANGE));
memcpy (&mxf_vanc_essence_element_writer.data_definition,
mxf_metadata_track_identifier_get (MXF_METADATA_TRACK_DATA_ESSENCE), 16);
mxf_essence_element_writer_register (&mxf_vanc_essence_element_writer);
}