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vc1dec: interlaced stream decoding support 1/3 

Signed-off-by: Anton Khirnov <anton@khirnov.net>
This commit is contained in:
Mashiat Sarker Shakkhar 2011-10-07 00:00:24 +05:00 committed by Anton Khirnov
parent 53efb758c0
commit d5b015e42d
1 changed files with 57 additions and 4 deletions
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61
libavcodec/vc1.h
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@ -105,12 +105,25 @@ enum MVModes {
};
//@}
/** MBMODE for interlaced frame P-picture */
//@{
enum MBModesIntfr {
MV_PMODE_INTFR_1MV,
MV_PMODE_INTFR_2MV_FIELD,
MV_PMODE_INTFR_2MV,
MV_PMODE_INTFR_4MV_FIELD,
MV_PMODE_INTFR_4MV,
MV_PMODE_INTFR_INTRA,
};
//@}
/** @name MV types for B frames */
//@{
enum BMVTypes {
BMV_TYPE_BACKWARD,
BMV_TYPE_FORWARD,
BMV_TYPE_INTERPOLATED
BMV_TYPE_INTERPOLATED,
BMV_TYPE_DIRECT
};
//@}
@ -260,16 +273,18 @@ typedef struct VC1Context{
* -# 2 -> [-512, 511.f] x [-128, 127.f]
* -# 3 -> [-1024, 1023.f] x [-256, 255.f]
*/
uint8_t mvrange;
uint8_t mvrange; ///< Extended MV range flag
uint8_t pquantizer; ///< Uniform (over sequence) quantizer in use
VLC *cbpcy_vlc; ///< CBPCY VLC table
int tt_index; ///< Index for Transform Type tables
int tt_index; ///< Index for Transform Type tables (to decode TTMB)
uint8_t* mv_type_mb_plane; ///< bitplane for mv_type == (4MV)
uint8_t* direct_mb_plane; ///< bitplane for "direct" MBs
uint8_t* forward_mb_plane; ///< bitplane for "forward" MBs
int mv_type_is_raw; ///< mv type mb plane is not coded
int dmb_is_raw; ///< direct mb plane is raw
int fmb_is_raw; ///< forward mb plane is raw
int skip_is_raw; ///< skip mb plane is not coded
uint8_t luty[256], lutuv[256]; // lookup tables used for intensity compensation
uint8_t luty[256], lutuv[256];///< lookup tables used for intensity compensation
int use_ic; ///< use intensity compensation in B-frames
int rnd; ///< rounding control
@ -307,6 +322,44 @@ typedef struct VC1Context{
uint8_t range_mapuv;
//@}
/** Frame decoding info for interlaced picture */
uint8_t dmvrange; ///< Extended differential MV range flag
int fourmvswitch;
int intcomp;
uint8_t lumscale2; ///< for interlaced field P picture
uint8_t lumshift2;
uint8_t luty2[256], lutuv2[256]; // lookup tables used for intensity compensation
VLC* mbmode_vlc;
VLC* imv_vlc;
VLC* twomvbp_vlc;
VLC* fourmvbp_vlc;
uint8_t twomvbp;
uint8_t fourmvbp;
uint8_t* fieldtx_plane;
int fieldtx_is_raw;
int8_t zzi_8x8[64];
uint8_t *blk_mv_type_base, *blk_mv_type; ///< 0: frame MV, 1: field MV (interlaced frame)
uint8_t *mv_f_base, *mv_f[2]; ///< 0: MV obtained from same field, 1: opposite field
uint8_t *mv_f_last_base, *mv_f_last[2];
uint8_t *mv_f_next_base, *mv_f_next[2];
int field_mode; ///< 1 for interlaced field pictures
int fptype;
int second_field;
int refdist; ///< distance of the current picture from reference
int numref; ///< number of past field pictures used as reference
// 0 corresponds to 1 and 1 corresponds to 2 references
int reffield; ///< if numref = 0 (1 reference) then reffield decides which
// field to use among the two fields from previous frame
int intcompfield; ///< which of the two fields to be intensity compensated
// 0: both fields, 1: bottom field, 2: top field
int cur_field_type; ///< 0: top, 1: bottom
int ref_field_type[2]; ///< forward and backward reference field type (top or bottom)
int blocks_off, mb_off;
int qs_last; ///< if qpel has been used in the previous (tr.) picture
int bmvtype;
int frfd, brfd; ///< reference frame distance (forward or backward)
int pic_header_flag;
/** Frame decoding info for sprite modes */
//@{
int new_sprite;