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decoder: h264: fix slice data bit offset with MVC NAL units.

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When MVC slice NAL units (coded slice extension and prefix NAL) are
present, the number of NAL header bytes is 3, not 1 as usual.

Signed-off-by: Li Xiaowei <xiaowei.a.li@intel.com>
Signed-off-by: Gwenole Beauchesne <gwenole.beauchesne@intel.com>
This commit is contained in:
Li Xiaowei 2013-03-07 11:32:20 +08:00 committed by Gwenole Beauchesne
parent 5a3e51472d
commit 3f14745d61
1 changed files with 7 additions and 5 deletions
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12
gst-libs/gst/vaapi/gstvaapidecoder_h264.c
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@ -2672,12 +2672,12 @@ decode_picture(GstVaapiDecoderH264 *decoder, GstVaapiDecoderUnit *unit)
}
static inline guint
get_slice_data_bit_offset(GstH264SliceHdr *slice_hdr)
get_slice_data_bit_offset(GstH264SliceHdr *slice_hdr, guint nal_header_bytes)
{
guint epb_count;
epb_count = slice_hdr->n_emulation_prevention_bytes;
return 8 /* nal_unit_type */ + slice_hdr->header_size - epb_count * 8;
return 8 * nal_header_bytes + slice_hdr->header_size - epb_count * 8;
}
static gboolean
@ -2793,12 +2793,14 @@ fill_RefPicList(GstVaapiDecoderH264 *decoder,
static gboolean
fill_slice(GstVaapiDecoderH264 *decoder,
GstVaapiSlice *slice, GstH264SliceHdr *slice_hdr)
GstVaapiSlice *slice, GstVaapiParserInfoH264 *pi)
{
VASliceParameterBufferH264 * const slice_param = slice->param;
GstH264SliceHdr * const slice_hdr = &pi->data.slice_hdr;
/* Fill in VASliceParameterBufferH264 */
slice_param->slice_data_bit_offset = get_slice_data_bit_offset(slice_hdr);
slice_param->slice_data_bit_offset =
get_slice_data_bit_offset(slice_hdr, pi->nalu.header_bytes);
slice_param->first_mb_in_slice = slice_hdr->first_mb_in_slice;
slice_param->slice_type = slice_hdr->type % 5;
slice_param->direct_spatial_mv_pred_flag = slice_hdr->direct_spatial_mv_pred_flag;
@ -2858,7 +2860,7 @@ decode_slice(GstVaapiDecoderH264 *decoder, GstVaapiDecoderUnit *unit)
return GST_VAAPI_DECODER_STATUS_ERROR_ALLOCATION_FAILED;
}
if (!fill_slice(decoder, slice, slice_hdr)) {
if (!fill_slice(decoder, slice, pi)) {
gst_vaapi_mini_object_unref(GST_VAAPI_MINI_OBJECT(slice));
return GST_VAAPI_DECODER_STATUS_ERROR_UNKNOWN;
}