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h264: improve robustness when packets are missing.

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Improve robustness when some expected packets where not received yet
or that were not correctly decoded. For example, don't try to decode
a picture if there was no valid frame headers parsed so far.

https://bugs.freedesktop.org/show_bug.cgi?id=57902
This commit is contained in:
Gwenole Beauchesne 2013-12-10 16:14:27 +01:00
parent 1dd89800b0
commit 6fe54964bb
1 changed files with 49 additions and 6 deletions
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55
gst-libs/gst/vaapi/gstvaapidecoder_h264.c
View file

@ -349,8 +349,23 @@ gst_vaapi_frame_store_has_reference(GstVaapiFrameStore *fs)
#define GST_VAAPI_DECODER_H264_CAST(decoder) \
((GstVaapiDecoderH264 *)(decoder))
typedef enum {
GST_H264_VIDEO_STATE_GOT_SPS = 1 << 0,
GST_H264_VIDEO_STATE_GOT_PPS = 1 << 1,
GST_H264_VIDEO_STATE_GOT_SLICE = 1 << 2,
GST_H264_VIDEO_STATE_VALID_PICTURE_HEADERS = (
GST_H264_VIDEO_STATE_GOT_SPS |
GST_H264_VIDEO_STATE_GOT_PPS),
GST_H264_VIDEO_STATE_VALID_PICTURE = (
GST_H264_VIDEO_STATE_VALID_PICTURE_HEADERS |
GST_H264_VIDEO_STATE_GOT_SLICE)
} GstH264VideoState;
struct _GstVaapiDecoderH264Private {
GstH264NalParser *parser;
guint parser_state;
guint decoder_state;
GstVaapiPictureH264 *current_picture;
GstVaapiParserInfoH264 *prev_slice_pi;
GstVaapiFrameStore *prev_frame;
@ -383,8 +398,6 @@ struct _GstVaapiDecoderH264Private {
gboolean prev_pic_structure; // previous picture structure
guint is_opened : 1;
guint is_avcC : 1;
guint got_sps : 1;
guint got_pps : 1;
guint has_context : 1;
guint progressive_sequence : 1;
};
@ -949,12 +962,22 @@ ensure_quant_matrix(GstVaapiDecoderH264 *decoder, GstVaapiPictureH264 *picture)
return GST_VAAPI_DECODER_STATUS_SUCCESS;
}
static inline gboolean
is_valid_state(guint state, guint ref_state)
{
return (state & ref_state) == ref_state;
}
static GstVaapiDecoderStatus
decode_current_picture(GstVaapiDecoderH264 *decoder)
{
GstVaapiDecoderH264Private * const priv = &decoder->priv;
GstVaapiPictureH264 * const picture = priv->current_picture;
if (!is_valid_state(priv->decoder_state, GST_H264_VIDEO_STATE_VALID_PICTURE))
goto drop_frame;
priv->decoder_state = 0;
if (!picture)
return GST_VAAPI_DECODER_STATUS_SUCCESS;
@ -972,6 +995,10 @@ error:
/* XXX: fix for cases where first field failed to be decoded */
gst_vaapi_picture_replace(&priv->current_picture, NULL);
return GST_VAAPI_DECODER_STATUS_ERROR_UNKNOWN;
drop_frame:
priv->decoder_state = 0;
return GST_VAAPI_DECODER_STATUS_DROP_FRAME;
}
static GstVaapiDecoderStatus
@ -984,6 +1011,8 @@ parse_sps(GstVaapiDecoderH264 *decoder, GstVaapiDecoderUnit *unit)
GST_DEBUG("parse SPS");
priv->parser_state = 0;
/* Variables that don't have inferred values per the H.264
standard but that should get a default value anyway */
sps->log2_max_pic_order_cnt_lsb_minus4 = 0;
@ -992,7 +1021,7 @@ parse_sps(GstVaapiDecoderH264 *decoder, GstVaapiDecoderUnit *unit)
if (result != GST_H264_PARSER_OK)
return get_status(result);
priv->got_sps = TRUE;
priv->parser_state |= GST_H264_VIDEO_STATE_GOT_SPS;
return GST_VAAPI_DECODER_STATUS_SUCCESS;
}
@ -1006,6 +1035,8 @@ parse_pps(GstVaapiDecoderH264 *decoder, GstVaapiDecoderUnit *unit)
GST_DEBUG("parse PPS");
priv->parser_state &= GST_H264_VIDEO_STATE_GOT_SPS;
/* Variables that don't have inferred values per the H.264
standard but that should get a default value anyway */
pps->slice_group_map_type = 0;
@ -1015,7 +1046,7 @@ parse_pps(GstVaapiDecoderH264 *decoder, GstVaapiDecoderUnit *unit)
if (result != GST_H264_PARSER_OK)
return get_status(result);
priv->got_pps = TRUE;
priv->parser_state |= GST_H264_VIDEO_STATE_GOT_PPS;
return GST_VAAPI_DECODER_STATUS_SUCCESS;
}
@ -1049,6 +1080,9 @@ parse_slice(GstVaapiDecoderH264 *decoder, GstVaapiDecoderUnit *unit)
GST_DEBUG("parse slice");
priv->parser_state &= (GST_H264_VIDEO_STATE_GOT_SPS|
GST_H264_VIDEO_STATE_GOT_PPS);
/* Variables that don't have inferred values per the H.264
standard but that should get a default value anyway */
slice_hdr->cabac_init_idc = 0;
@ -1059,6 +1093,7 @@ parse_slice(GstVaapiDecoderH264 *decoder, GstVaapiDecoderUnit *unit)
if (result != GST_H264_PARSER_OK)
return get_status(result);
priv->parser_state |= GST_H264_VIDEO_STATE_GOT_SLICE;
return GST_VAAPI_DECODER_STATUS_SUCCESS;
}
@ -2502,6 +2537,8 @@ decode_picture(GstVaapiDecoderH264 *decoder, GstVaapiDecoderUnit *unit)
if (status != GST_VAAPI_DECODER_STATUS_SUCCESS)
return status;
priv->decoder_state = 0;
if (priv->current_picture) {
/* Re-use current picture where the first field was decoded */
picture = gst_vaapi_picture_h264_new_field(priv->current_picture);
@ -2543,6 +2580,10 @@ decode_picture(GstVaapiDecoderH264 *decoder, GstVaapiDecoderUnit *unit)
return GST_VAAPI_DECODER_STATUS_ERROR_UNKNOWN;
if (!fill_picture(decoder, picture, pi))
return GST_VAAPI_DECODER_STATUS_ERROR_UNKNOWN;
priv->decoder_state = priv->parser_state & (
GST_H264_VIDEO_STATE_GOT_SPS |
GST_H264_VIDEO_STATE_GOT_PPS);
return GST_VAAPI_DECODER_STATUS_SUCCESS;
}
@ -2704,8 +2745,9 @@ decode_slice(GstVaapiDecoderH264 *decoder, GstVaapiDecoderUnit *unit)
GST_DEBUG("slice (%u bytes)", pi->nalu.size);
if (!priv->got_sps || !priv->got_pps) {
GST_ERROR("not initialized yet");
if (!is_valid_state(priv->decoder_state,
GST_H264_VIDEO_STATE_VALID_PICTURE_HEADERS)) {
GST_WARNING("failed to receive enough headers to decode slice");
return GST_VAAPI_DECODER_STATUS_SUCCESS;
}
@ -2729,6 +2771,7 @@ decode_slice(GstVaapiDecoderH264 *decoder, GstVaapiDecoderUnit *unit)
gst_vaapi_picture_add_slice(GST_VAAPI_PICTURE_CAST(picture), slice);
picture->last_slice_hdr = slice_hdr;
priv->decoder_state |= GST_H264_VIDEO_STATE_GOT_SLICE;
return GST_VAAPI_DECODER_STATUS_SUCCESS;
}