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mpeg2: optimize scan for the end of the frame.

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Heuristic: if the second start-code is available, check whether that
one marks the start of a new frame because e.g. this is a sequence
or picture header. This doesn't save much, since we already cache the
results.
This commit is contained in:
Gwenole Beauchesne 2013-01-09 16:05:39 +01:00
parent 3bc6078f32
commit 0ecb3a627b
1 changed files with 14 additions and 3 deletions
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17
gst-libs/gst/vaapi/gstvaapidecoder_mpeg2.c
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@ -1323,7 +1323,7 @@ gst_vaapi_decoder_mpeg2_parse(GstVaapiDecoder *base_decoder,
GST_VAAPI_DECODER_MPEG2_CAST(base_decoder);
GstVaapiParserState * const ps = GST_VAAPI_PARSER_STATE(base_decoder);
GstVaapiDecoderStatus status;
GstMpegVideoPacketTypeCode type;
GstMpegVideoPacketTypeCode type, type2 = GST_MPEG_VIDEO_PACKET_NONE;
const guchar *buf;
guint buf_size, flags;
gint ofs, ofs1, ofs2;
@ -1350,7 +1350,7 @@ gst_vaapi_decoder_mpeg2_parse(GstVaapiDecoder *base_decoder,
ofs2 = ofs1 + 4;
ofs = G_UNLIKELY(buf_size < ofs2 + 4) ? -1 :
scan_for_start_code(&buf[ofs2], buf_size - ofs2, NULL);
scan_for_start_code(&buf[ofs2], buf_size - ofs2, &type2);
if (ofs < 0) {
// Assume the whole packet is present if end-of-stream
if (!at_eos) {
@ -1386,8 +1386,19 @@ gst_vaapi_decoder_mpeg2_parse(GstVaapiDecoder *base_decoder,
break;
default:
if (type >= GST_MPEG_VIDEO_PACKET_SLICE_MIN &&
type <= GST_MPEG_VIDEO_PACKET_SLICE_MAX)
type <= GST_MPEG_VIDEO_PACKET_SLICE_MAX) {
flags |= GST_VAAPI_DECODER_UNIT_FLAG_SLICE;
switch (type2) {
case GST_MPEG_VIDEO_PACKET_USER_DATA:
case GST_MPEG_VIDEO_PACKET_SEQUENCE:
case GST_MPEG_VIDEO_PACKET_GOP:
case GST_MPEG_VIDEO_PACKET_PICTURE:
flags |= GST_VAAPI_DECODER_UNIT_FLAG_FRAME_END;
break;
default:
break;
}
}
// Ignore system start codes (PES headers)
else if (type >= 0xb9 && type <= 0xff)