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mpegvideoparser: Handle non-hierarchical profiles again

Browse source 
This is a regression from since mpegvideoparser was switched to
use the codecparsing library.

The problem is that the high bit of the profile_and_level is used
to specify non-hierarchical profiles and levels. Unfortunately we
were discarding that information.

Expose that escape bit, and use it in the element

https://bugzilla.gnome.org/show_bug.cgi?id=763220
This commit is contained in:
Edward Hervey 2016-03-07 13:04:08 +01:00 committed by Edward Hervey
parent 1f32d6aff7
commit 5ebf1d477d
3 changed files with 16 additions and 11 deletions
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3
gst-libs/gst/codecparsers/gstmpegvideoparser.c
View file

@ -408,7 +408,8 @@ gst_mpeg_video_packet_parse_sequence_extension (const GstMpegVideoPacket *
}
/* skip profile and level escape bit */
gst_bit_reader_skip_unchecked (&br, 1);
seqext->profile_level_escape_bit =
gst_bit_reader_get_bits_uint8_unchecked (&br, 1);
seqext->profile = gst_bit_reader_get_bits_uint8_unchecked (&br, 3);
seqext->level = gst_bit_reader_get_bits_uint8_unchecked (&br, 4);

4
gst-libs/gst/codecparsers/gstmpegvideoparser.h
View file

@ -249,6 +249,8 @@ struct _GstMpegVideoSequenceHdr
* otherwise
* @fps_n_ext: Framerate nominator code
* @fps_d_ext: Framerate denominator code
* @profile_level_escape_bit: Escape bit. If set, the meaning of the
* @profile and @level fields is different.
*
* The Mpeg2 Video Sequence Extension structure.
**/
@ -269,6 +271,8 @@ struct _GstMpegVideoSequenceExt
guint8 low_delay;
guint8 fps_n_ext, fps_d_ext;
/* Additional information */
guint8 profile_level_escape_bit;
};
/**

20
gst/videoparsers/gstmpegvideoparse.c
View file

@ -815,6 +815,7 @@ gst_mpegv_parse_update_src_caps (GstMpegvParse * mpvparse)
}
if (mpvparse->config_flags & FLAG_SEQUENCE_EXT) {
guint8 escape = mpvparse->sequenceext.profile_level_escape_bit;
const guint profile_c = mpvparse->sequenceext.profile;
const guint level_c = mpvparse->sequenceext.level;
const gchar *profile = NULL, *level = NULL;
@ -824,20 +825,14 @@ gst_mpegv_parse_update_src_caps (GstMpegvParse * mpvparse)
* 4:2:2 and Multi-view have profile = 0, with the escape bit set to 1
*/
const gchar *const profiles[] =
{ "high", "spatial", "snr", "main", "simple" };
{ "4:2:2", "high", "spatial", "snr", "main", "simple" };
/*
* Level indication - 4 => High, 6 => High-1440, 8 => Main, 10 => Low,
* except in the case of profile = 0
*/
const gchar *const levels[] = { "high", "high-1440", "main", "low" };
if (profile_c > 0 && profile_c < 6)
profile = profiles[profile_c - 1];
if ((level_c > 3) && (level_c < 11) && (level_c % 2 == 0))
level = levels[(level_c >> 1) - 2];
if (profile_c == 8) {
if (escape) {
/* Non-hierarchical profile */
switch (level_c) {
case 2:
@ -863,9 +858,14 @@ gst_mpegv_parse_update_src_caps (GstMpegvParse * mpvparse)
default:
break;
}
}
/* FIXME does it make sense to expose profile/level in the caps ? */
} else {
if (profile_c < 6)
profile = profiles[profile_c];
if ((level_c > 3) && (level_c < 11) && (level_c % 2 == 0))
level = levels[(level_c >> 1) - 2];
}
GST_DEBUG_OBJECT (mpvparse, "profile:'%s' level:'%s'", profile, level);