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codecparsers: VC1: Compute par and fps in advanced profile

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This commit is contained in:
Thibault Saunier 2011-10-14 11:07:00 -03:00
parent 14590f06a0
commit 73d847ba24
2 changed files with 67 additions and 0 deletions
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63
gst-libs/gst/codecparsers/gstvc1parser.c
View file

@ -277,6 +277,51 @@ static const VLCTable vc1_norm6_vlc_table[64] = {
{63, (3 << 1) | 1, 6}
};
/* SMPTE 421M Table 7 */
typedef struct
{
gint par_n, par_d;
} PAR;
static PAR aspect_ratios[] = {
{0, 0},
{1, 1},
{12, 11},
{10, 11},
{16, 11},
{40, 33},
{24, 11},
{20, 11},
{32, 11},
{80, 33},
{18, 11},
{15, 11},
{64, 33},
{160, 99},
{0, 0},
{0, 0}
};
/* SMPTE 421M Table 8 */
static const guint framerates_n[] = {
0,
24 * 1000,
25 * 1000,
30 * 1000,
50 * 1000,
60 * 1000,
48 * 1000,
72 * 1000
};
/* SMPTE 421M Table 9 */
static const guint framerates_d[] = {
0,
1000,
1001
};
static inline gboolean
decode_colskip (GstBitReader * br, guint8 * data, guint width, guint height,
guint stride, guint invert)
@ -813,6 +858,10 @@ parse_sequence_header_advanced (GstVC1SeqHdr * seqhdr, GstBitReader * br)
READ_UINT8 (br, tmp, 3);
advanced->level = tmp;
advanced->par_n = 0;
advanced->par_d = 0;
advanced->fps_n = 0;
advanced->fps_d = 0;
READ_UINT8 (br, advanced->colordiff_format, 2);
READ_UINT8 (br, advanced->frmrtq_postproc, 3);
@ -867,6 +916,11 @@ parse_sequence_header_advanced (GstVC1SeqHdr * seqhdr, GstBitReader * br)
if (advanced->aspect_ratio == 15) {
READ_UINT8 (br, advanced->aspect_horiz_size, 8);
READ_UINT8 (br, advanced->aspect_vert_size, 8);
advanced->par_n = advanced->aspect_horiz_size;
advanced->par_d = advanced->aspect_vert_size;
} else {
advanced->par_n = aspect_ratios[advanced->aspect_ratio].par_n;
advanced->par_d = aspect_ratios[advanced->aspect_ratio].par_d;
}
}
READ_UINT8 (br, advanced->framerate_flag, 1);
@ -879,6 +933,15 @@ parse_sequence_header_advanced (GstVC1SeqHdr * seqhdr, GstBitReader * br)
} else {
READ_UINT16 (br, advanced->framerateexp, 16);
}
if (advanced->frameratenr > 0 &&
advanced->frameratenr < 8 &&
advanced->frameratedr > 0 && advanced->frameratedr < 3) {
advanced->fps_n = framerates_n[advanced->frameratenr];
advanced->fps_d = framerates_d[advanced->frameratedr];
} else {
advanced->fps_n = advanced->framerateexp + 1;
advanced->fps_d = 32;
}
}
READ_UINT8 (br, advanced->color_format_flag, 1);

4
gst-libs/gst/codecparsers/gstvc1parser.h
View file

@ -243,6 +243,10 @@ struct _GstVC1AdvancedSeqHdr
/* computed */
guint framerate; /* Around in fps, 0 if unknown*/
guint bitrate; /* Around in kpbs, 0 if unknown*/
guint par_n;
guint par_d;
guint fps_n;
guint fps_d;
/* The last parsed entry point */
GstVC1EntryPointHdr entrypoint;