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codecparsers: h264: recognize SVC NAL units.

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Identify SVC NAL units and tag them as such. This is necessary for
gst_h264_parser_parse_slice_hdr() to fail gracefully, if the user
did not perform the check himself.

Signed-off-by: Gwenole Beauchesne <gwenole.beauchesne@intel.com>
This commit is contained in:
Gwenole Beauchesne 2014-05-22 13:13:14 +02:00
parent b50c3e2127
commit 65fc58da4d
2 changed files with 24 additions and 1 deletions
gst-libs/gst/codecparsers
gsth264parser.cgsth264parser.h

12
gst-libs/gst/codecparsers/gsth264parser.c
View file

@ -226,7 +226,11 @@ gst_h264_parse_nalu_header (GstH264NalUnit * nalu)
nalu->size - nalu->header_bytes);
svc_extension_flag = gst_bit_reader_get_bits_uint8_unchecked (&br, 1);
if (!svc_extension_flag) { /* MVC */
if (svc_extension_flag) { /* SVC */
nalu->extension_type = GST_H264_NAL_EXTENSION_SVC;
} else { /* MVC */
GstH264NalUnitExtensionMVC *const mvc = &nalu->extension.mvc;
nalu->extension_type = GST_H264_NAL_EXTENSION_MVC;
@ -2139,6 +2143,12 @@ gst_h264_parser_parse_slice_hdr (GstH264NalParser * nalparser,
return GST_H264_PARSER_BROKEN_LINK;
}
/* Check we can actually parse this slice (AVC, MVC headers only) */
if (sps->extension_type && sps->extension_type != GST_H264_NAL_EXTENSION_MVC) {
GST_WARNING ("failed to parse unsupported slice header");
return GST_H264_PARSER_BROKEN_DATA;
}
/* set default values for fields that might not be present in the bitstream
and have valid defaults */
slice->field_pic_flag = 0;

13
gst-libs/gst/codecparsers/gsth264parser.h
View file

@ -50,6 +50,17 @@ G_BEGIN_DECLS
#define GST_H264_IS_SP_SLICE(slice) (((slice)->type % 5) == GST_H264_SP_SLICE)
#define GST_H264_IS_SI_SLICE(slice) (((slice)->type % 5) == GST_H264_SI_SLICE)
/**
* GST_H264_IS_SVC_NALU:
* @nalu: a #GstH264NalUnit
*
* Check if @nalu is a scalable extension NAL unit.
*
* Since: 1.6
*/
#define GST_H264_IS_SVC_NALU(nalu) \
((nalu)->extension_type == GST_H264_NAL_EXTENSION_SVC)
/**
* GST_H264_IS_MVC_NALU:
* @nalu: a #GstH264NalUnit
@ -147,6 +158,7 @@ typedef enum
/**
* GstH264NalUnitExtensionType:
* @GST_H264_NAL_EXTENSION_NONE: No NAL unit header extension is available
* @GST_H264_NAL_EXTENSION_SVC: NAL unit header extension for SVC (Annex G)
* @GST_H264_NAL_EXTENSION_MVC: NAL unit header extension for MVC (Annex H)
*
* Indicates the type of H.264 NAL unit extension.
@ -156,6 +168,7 @@ typedef enum
typedef enum
{
GST_H264_NAL_EXTENSION_NONE = 0,
GST_H264_NAL_EXTENSION_SVC,
GST_H264_NAL_EXTENSION_MVC,
} GstH264NalUnitExtensionType;