mpeg4videodec.c File Reference

#include "config_components.h"
#include "libavutil/avassert.h"
#include "libavutil/internal.h"
#include "libavutil/opt.h"
#include "libavutil/thread.h"
#include "codec_internal.h"
#include "error_resilience.h"
#include "hwconfig.h"
#include "idctdsp.h"
#include "mpegutils.h"
#include "mpegvideo.h"
#include "mpegvideodata.h"
#include "mpegvideodec.h"
#include "mpegvideo_unquantize.h"
#include "mpeg4video.h"
#include "mpeg4videodata.h"
#include "mpeg4videodec.h"
#include "mpeg4videodefs.h"
#include "h263.h"
#include "h263data.h"
#include "h263dec.h"
#include "internal.h"
#include "profiles.h"
#include "qpeldsp.h"
#include "threadprogress.h"
#include "unary.h"

Go to the source code of this file.

Macros
#define	UNCHECKED_BITSTREAM_READER   1
#define	IS_3IV1   0
#define	SPRITE_TRAJ_VLC_BITS   6
#define	DC_VLC_BITS   9
#define	MB_TYPE_B_VLC_BITS   4
#define	STUDIO_INTRA_BITS   9

Functions
static Mpeg4DecContext *	h263_to_mpeg4 (H263DecContext *h)
static void	gmc1_motion (MpegEncContext *s, const Mpeg4DecContext *ctx, uint8_t *dest_y, uint8_t *dest_cb, uint8_t *dest_cr, uint8_t *const *ref_picture)
static void	gmc_motion (MpegEncContext *s, const Mpeg4DecContext *ctx, uint8_t *dest_y, uint8_t *dest_cb, uint8_t *dest_cr, uint8_t *const *ref_picture)
void	ff_mpeg4_mcsel_motion (MpegEncContext *s, uint8_t *dest_y, uint8_t *dest_cb, uint8_t *dest_cr, uint8_t *const *ref_picture)
void	ff_mpeg4_decode_studio (MpegEncContext *s, uint8_t *dest_y, uint8_t *dest_cb, uint8_t *dest_cr, int block_size, int uvlinesize, int dct_linesize, int dct_offset)
void	ff_mpeg4_pred_ac (H263DecContext *const h, int16_t *block, int n, int dir)
	Predict the ac.
static int	mpeg4_is_resync (Mpeg4DecContext *ctx)
	check if the next stuff is a resync marker or the end.
static int	mpeg4_decode_sprite_trajectory (Mpeg4DecContext *ctx, GetBitContext *gb)
static int	decode_new_pred (Mpeg4DecContext *ctx, GetBitContext *gb)
int	ff_mpeg4_decode_video_packet_header (H263DecContext *const h)
	Decode the next video packet.
static void	reset_studio_dc_predictors (Mpeg4DecContext *const ctx)
int	ff_mpeg4_decode_studio_slice_header (H263DecContext *const h)
	Decode the next video packet.
static int	get_amv (Mpeg4DecContext *ctx, int n)
	Get the average motion vector for a GMC MB.
static int	mpeg4_pred_dc (MpegEncContext *s, int n, int *dir_ptr)
	Predict the dc.
static int	mpeg4_get_level_dc (MpegEncContext *s, int n, int pred, int level)
static int	mpeg4_decode_dc (H263DecContext *const h, int n, int *dir_ptr)
	Decode the dc value.
static int	mpeg4_decode_partition_a (Mpeg4DecContext *ctx)
	Decode first partition.
static int	mpeg4_decode_partition_b (H263DecContext *const h, int mb_count)
	decode second partition.
int	ff_mpeg4_decode_partitions (H263DecContext *const h)
	Decode the first and second partition.
static int	mpeg4_decode_block (Mpeg4DecContext *ctx, int16_t *block, int n, int coded, int intra, int use_intra_dc_vlc, int rvlc)
	Decode a block.
static int	mpeg4_decode_partitioned_mb (H263DecContext *const h)
	decode partition C of one MB.
static int	mpeg4_decode_mb (H263DecContext *const h)
static void	next_start_code_studio (GetBitContext *gb)
static int	mpeg4_decode_studio_block (Mpeg4DecContext *const ctx, int32_t block[64], int n)
static int	mpeg4_decode_dpcm_macroblock (Mpeg4DecContext *const ctx, int16_t macroblock[256], int n)
static int	mpeg4_decode_studio_mb (H263DecContext *const h)
static int	mpeg4_decode_gop_header (MpegEncContext *s, GetBitContext *gb)
static int	mpeg4_decode_profile_level (MpegEncContext *s, GetBitContext *gb, int *profile, int *level)
static int	mpeg4_decode_visual_object (MpegEncContext *s, GetBitContext *gb)
static void	mpeg4_load_default_matrices (MpegEncContext *s)
static int	read_quant_matrix_ext (MpegEncContext *s, GetBitContext *gb)
static void	extension_and_user_data (MpegEncContext *s, GetBitContext *gb, int id)
static int	decode_studio_vol_header (Mpeg4DecContext *ctx, GetBitContext *gb)
static int	decode_vol_header (Mpeg4DecContext *ctx, GetBitContext *gb)
static int	decode_user_data (Mpeg4DecContext *ctx, GetBitContext *gb)
	Decode the user data stuff in the header.
static int	decode_vop_header (Mpeg4DecContext *ctx, GetBitContext *gb, int parse_only)
static void	decode_smpte_tc (Mpeg4DecContext *ctx, GetBitContext *gb)
static int	decode_studio_vop_header (Mpeg4DecContext *ctx, GetBitContext *gb)
	Decode the next studio vop header.
static int	decode_studiovisualobject (Mpeg4DecContext *ctx, GetBitContext *gb)
int	ff_mpeg4_parse_picture_header (Mpeg4DecContext *ctx, GetBitContext *gb, int header, int parse_only)
	Decode MPEG-4 headers.

Variables
static VLCElem	dc_lum [512]
static VLCElem	dc_chrom [512]
static VLCElem	sprite_trajectory [128]
static VLCElem	mb_type_b_vlc [16]
static const VLCElem *	studio_intra_tab [12]
static VLCElem	studio_luma_dc [528]
static VLCElem	studio_chroma_dc [528]
static const uint8_t	mpeg4_block_count [4] = { 0, 6, 8, 12 }
static const int16_t	mb_type_b_map [4]
static const uint8_t	ac_state_tab [22][2]

Macro Definition Documentation

UNCHECKED_BITSTREAM_READER

#define UNCHECKED_BITSTREAM_READER   1

Definition at line 23 of file mpeg4videodec.c.

IS_3IV1

#define IS_3IV1   0

Definition at line 56 of file mpeg4videodec.c.

Referenced by decode_vop_header(), mpeg4_decode_block(), mpeg4_decode_dc(), and mpeg4_get_level_dc().

SPRITE_TRAJ_VLC_BITS

#define SPRITE_TRAJ_VLC_BITS   6

Definition at line 63 of file mpeg4videodec.c.

Referenced by mpeg4_decode_sprite_trajectory().

DC_VLC_BITS

#define DC_VLC_BITS   9

Definition at line 64 of file mpeg4videodec.c.

MB_TYPE_B_VLC_BITS

#define MB_TYPE_B_VLC_BITS   4

Definition at line 65 of file mpeg4videodec.c.

Referenced by mpeg4_decode_mb().

STUDIO_INTRA_BITS

#define STUDIO_INTRA_BITS   9

Definition at line 66 of file mpeg4videodec.c.

Referenced by mpeg4_decode_studio_block().

Function Documentation

h263_to_mpeg4()

static Mpeg4DecContext * h263_to_mpeg4 ( H263DecContext * h )

inlinestatic

Definition at line 84 of file mpeg4videodec.c.

Referenced by ff_mpeg4_decode_partitions(), ff_mpeg4_decode_studio_slice_header(), ff_mpeg4_decode_video_packet_header(), mpeg4_decode_mb(), mpeg4_decode_partitioned_mb(), and mpeg4_decode_studio_mb().

gmc1_motion()

static void gmc1_motion ( MpegEncContext * s, const Mpeg4DecContext * ctx, uint8_t * dest_y, uint8_t * dest_cb, uint8_t * dest_cr, uint8_t *const * ref_picture )

static

Definition at line 90 of file mpeg4videodec.c.

Referenced by ff_mpeg4_mcsel_motion().

gmc_motion()

static void gmc_motion ( MpegEncContext * s, const Mpeg4DecContext * ctx, uint8_t * dest_y, uint8_t * dest_cb, uint8_t * dest_cr, uint8_t *const * ref_picture )

static

Definition at line 187 of file mpeg4videodec.c.

Referenced by ff_mpeg4_mcsel_motion().

ff_mpeg4_mcsel_motion()

void ff_mpeg4_mcsel_motion	(	MpegEncContext *	s,
		uint8_t *	dest_y,
		uint8_t *	dest_cb,
		uint8_t *	dest_cr,
		uint8_t *const *	ref_picture )

Definition at line 245 of file mpeg4videodec.c.

Referenced by mpv_motion_internal().

ff_mpeg4_decode_studio()

void ff_mpeg4_decode_studio	(	MpegEncContext *	s,
		uint8_t *	dest_y,
		uint8_t *	dest_cb,
		uint8_t *	dest_cr,
		int	block_size,
		int	uvlinesize,
		int	dct_linesize,
		int	dct_offset )

Definition at line 260 of file mpeg4videodec.c.

Referenced by mpv_reconstruct_mb_internal().

ff_mpeg4_pred_ac()

void ff_mpeg4_pred_ac	(	H263DecContext *const	h,
		int16_t *	block,
		int	n,
		int	dir )

Predict the ac.

Parameters

n	block index (0-3 are luma, 4-5 are chroma)
dir	the ac prediction direction

Definition at line 328 of file mpeg4videodec.c.

Referenced by ff_msmpeg4_decode_block(), and mpeg4_decode_block().

mpeg4_is_resync()

static int mpeg4_is_resync ( Mpeg4DecContext * ctx )

inlinestatic

check if the next stuff is a resync marker or the end.

Returns

0 if not

Definition at line 383 of file mpeg4videodec.c.

Referenced by mpeg4_decode_mb(), and mpeg4_decode_partitioned_mb().

mpeg4_decode_sprite_trajectory()

static int mpeg4_decode_sprite_trajectory ( Mpeg4DecContext * ctx, GetBitContext * gb )

static

Definition at line 437 of file mpeg4videodec.c.

Referenced by decode_vop_header(), and ff_mpeg4_decode_video_packet_header().

decode_new_pred()

static int decode_new_pred ( Mpeg4DecContext * ctx, GetBitContext * gb )

static

Definition at line 693 of file mpeg4videodec.c.

Referenced by decode_vop_header(), and ff_mpeg4_decode_video_packet_header().

ff_mpeg4_decode_video_packet_header()

int ff_mpeg4_decode_video_packet_header

(

H263DecContext *const

h

)

Decode the next video packet.

Returns

<0 if something went wrong

Definition at line 708 of file mpeg4videodec.c.

Referenced by ff_h263_resync().

reset_studio_dc_predictors()

static void reset_studio_dc_predictors ( Mpeg4DecContext *const ctx )

static

Definition at line 795 of file mpeg4videodec.c.

Referenced by decode_studio_vop_header(), and ff_mpeg4_decode_studio_slice_header().

ff_mpeg4_decode_studio_slice_header()

int ff_mpeg4_decode_studio_slice_header

(

H263DecContext *const

h

)

Decode the next video packet.

Returns

<0 if something went wrong

Definition at line 808 of file mpeg4videodec.c.

Referenced by decode_slice().

get_amv()

static int get_amv ( Mpeg4DecContext * ctx, int n )

inlinestatic

Get the average motion vector for a GMC MB.

Parameters

n	either 0 for the x component or 1 for y

Returns

the average MV for a GMC MB

Definition at line 850 of file mpeg4videodec.c.

Referenced by mpeg4_decode_mb(), and mpeg4_decode_partition_a().

mpeg4_pred_dc()

static int mpeg4_pred_dc ( MpegEncContext * s, int n, int * dir_ptr )

inlinestatic

Predict the dc.

Parameters

n	block index (0-3 are luma, 4-5 are chroma)
dir_ptr	pointer to an integer where the prediction direction will be stored

Definition at line 902 of file mpeg4videodec.c.

Referenced by mpeg4_decode_block(), and mpeg4_decode_dc().

mpeg4_get_level_dc()

static int mpeg4_get_level_dc ( MpegEncContext * s, int n, int pred, int level )

inlinestatic

Definition at line 940 of file mpeg4videodec.c.

Referenced by mpeg4_decode_block(), and mpeg4_decode_dc().

mpeg4_decode_dc()

static int mpeg4_decode_dc ( H263DecContext *const h, int n, int * dir_ptr )

inlinestatic

Decode the dc value.

Parameters

n	block index (0-3 are luma, 4-5 are chroma)
dir_ptr	the prediction direction will be stored here

Returns

the quantized dc

Definition at line 983 of file mpeg4videodec.c.

Referenced by mpeg4_decode_block(), mpeg4_decode_partition_a(), and mpeg4_decode_partition_b().

mpeg4_decode_partition_a()

static int mpeg4_decode_partition_a ( Mpeg4DecContext * ctx )

static

Decode first partition.

Returns

number of MBs decoded or <0 if an error occurred

Definition at line 1031 of file mpeg4videodec.c.

Referenced by ff_mpeg4_decode_partitions().

mpeg4_decode_partition_b()

static int mpeg4_decode_partition_b ( H263DecContext *const h, int mb_count )

static

decode second partition.

Returns

<0 if an error occurred

Definition at line 1223 of file mpeg4videodec.c.

Referenced by ff_mpeg4_decode_partitions().

ff_mpeg4_decode_partitions()

int ff_mpeg4_decode_partitions

(

H263DecContext *const

h

)

Decode the first and second partition.

Returns

<0 if error (and sets error type in the error_status_table)

Definition at line 1316 of file mpeg4videodec.c.

Referenced by decode_slice().

mpeg4_decode_block()

static int mpeg4_decode_block ( Mpeg4DecContext * ctx, int16_t * block, int n, int coded, int intra, int use_intra_dc_vlc, int rvlc )

inlinestatic

Decode a block.

Returns

<0 if an error occurred

Definition at line 1381 of file mpeg4videodec.c.

Referenced by mpeg4_decode_mb(), and mpeg4_decode_partitioned_mb().

mpeg4_decode_partitioned_mb()

static int mpeg4_decode_partitioned_mb ( H263DecContext *const h )

static

decode partition C of one MB.

Returns

<0 if an error occurred

Definition at line 1654 of file mpeg4videodec.c.

Referenced by decode_vop_header().

mpeg4_decode_mb()

static int mpeg4_decode_mb ( H263DecContext *const h )

static

Definition at line 1741 of file mpeg4videodec.c.

Referenced by decode_vop_header().

next_start_code_studio()

static void next_start_code_studio ( GetBitContext * gb )

static

Definition at line 2120 of file mpeg4videodec.c.

Referenced by decode_studio_vol_header(), decode_studio_vop_header(), decode_studiovisualobject(), ff_mpeg4_parse_picture_header(), mpeg4_decode_studio_mb(), and read_quant_matrix_ext().

mpeg4_decode_studio_block()

static int mpeg4_decode_studio_block ( Mpeg4DecContext *const ctx, int32_t block[64], int n )

static

Definition at line 2156 of file mpeg4videodec.c.

Referenced by mpeg4_decode_studio_mb().

mpeg4_decode_dpcm_macroblock()

static int mpeg4_decode_dpcm_macroblock ( Mpeg4DecContext *const ctx, int16_t macroblock[256], int n )

static

Definition at line 2271 of file mpeg4videodec.c.

Referenced by mpeg4_decode_studio_mb().

mpeg4_decode_studio_mb()

static int mpeg4_decode_studio_mb ( H263DecContext *const h )

static

Definition at line 2356 of file mpeg4videodec.c.

Referenced by decode_studio_vop_header().

mpeg4_decode_gop_header()

static int mpeg4_decode_gop_header ( MpegEncContext * s, GetBitContext * gb )

static

Definition at line 2404 of file mpeg4videodec.c.

Referenced by ff_mpeg4_parse_picture_header().

mpeg4_decode_profile_level()

static int mpeg4_decode_profile_level ( MpegEncContext * s, GetBitContext * gb, int * profile, int * level )

static

Definition at line 2426 of file mpeg4videodec.c.

Referenced by ff_mpeg4_parse_picture_header().

mpeg4_decode_visual_object()

static int mpeg4_decode_visual_object ( MpegEncContext * s, GetBitContext * gb )

static

Definition at line 2440 of file mpeg4videodec.c.

Referenced by ff_mpeg4_parse_picture_header().

mpeg4_load_default_matrices()

static void mpeg4_load_default_matrices ( MpegEncContext * s )

static

Definition at line 2472 of file mpeg4videodec.c.

Referenced by decode_studio_vop_header(), and decode_vol_header().

read_quant_matrix_ext()

static int read_quant_matrix_ext ( MpegEncContext * s, GetBitContext * gb )

static

Definition at line 2489 of file mpeg4videodec.c.

Referenced by extension_and_user_data().

extension_and_user_data()

static void extension_and_user_data ( MpegEncContext * s, GetBitContext * gb, int id )

static

Definition at line 2538 of file mpeg4videodec.c.

Referenced by decode_studio_vol_header(), decode_studio_vop_header(), decode_studiovisualobject(), and ff_mpeg4_parse_picture_header().

decode_studio_vol_header()

static int decode_studio_vol_header ( Mpeg4DecContext * ctx, GetBitContext * gb )

static

Definition at line 2555 of file mpeg4videodec.c.

Referenced by decode_vol_header().

decode_vol_header()

static int decode_vol_header ( Mpeg4DecContext * ctx, GetBitContext * gb )

static

Definition at line 2641 of file mpeg4videodec.c.

Referenced by ff_mpeg4_parse_picture_header().

decode_user_data()

static int decode_user_data ( Mpeg4DecContext * ctx, GetBitContext * gb )

static

Decode the user data stuff in the header.

Also initializes divx/xvid/lavc_version/build.

Definition at line 3011 of file mpeg4videodec.c.

Referenced by ff_mpeg4_parse_picture_header().

decode_vop_header()

static int decode_vop_header ( Mpeg4DecContext * ctx, GetBitContext * gb, int parse_only )

static

Definition at line 3068 of file mpeg4videodec.c.

Referenced by ff_mpeg4_parse_picture_header().

decode_smpte_tc()

static void decode_smpte_tc ( Mpeg4DecContext * ctx, GetBitContext * gb )

static

Definition at line 3348 of file mpeg4videodec.c.

Referenced by decode_studio_vop_header().

decode_studio_vop_header()

static int decode_studio_vop_header ( Mpeg4DecContext * ctx, GetBitContext * gb )

static

Decode the next studio vop header.

Returns

<0 if something went wrong

Definition at line 3367 of file mpeg4videodec.c.

Referenced by ff_mpeg4_parse_picture_header().

decode_studiovisualobject()

static int decode_studiovisualobject ( Mpeg4DecContext * ctx, GetBitContext * gb )

static

Definition at line 3413 of file mpeg4videodec.c.

Referenced by ff_mpeg4_parse_picture_header().

ff_mpeg4_parse_picture_header()

int ff_mpeg4_parse_picture_header	(	Mpeg4DecContext *	ctx,
		GetBitContext *	gb,
		int	header,
		int	parse_only )

Decode MPEG-4 headers.

Parameters

header	If set the absence of a VOP is not treated as error; otherwise, it is treated as such.
parse_only	If set, things only relevant to a decoder may be skipped; furthermore, the VLC tables may be uninitialized.

Returns

<0 if an error occurred FRAME_SKIPPED if a not coded VOP is found 0 else

Definition at line 3440 of file mpeg4videodec.c.

Referenced by mpeg4_decode_header().

Variable Documentation

dc_lum

VLCElem dc_lum[512]

static

Definition at line 68 of file mpeg4videodec.c.

Referenced by mpeg4_decode_dc().

dc_chrom

VLCElem dc_chrom[512]

static

Definition at line 68 of file mpeg4videodec.c.

Referenced by mpeg4_decode_dc().

sprite_trajectory

VLCElem sprite_trajectory[128]

static

Definition at line 69 of file mpeg4videodec.c.

Referenced by mpeg4_decode_sprite_trajectory().

mb_type_b_vlc

VLCElem mb_type_b_vlc[16]

static

Definition at line 70 of file mpeg4videodec.c.

Referenced by mpeg4_decode_mb().

studio_intra_tab

const VLCElem* studio_intra_tab[12]

static

Definition at line 71 of file mpeg4videodec.c.

Referenced by mpeg4_decode_studio_block().

studio_luma_dc

VLCElem studio_luma_dc[528]

static

Definition at line 72 of file mpeg4videodec.c.

Referenced by mpeg4_decode_studio_block().

studio_chroma_dc

VLCElem studio_chroma_dc[528]

static

Definition at line 73 of file mpeg4videodec.c.

Referenced by mpeg4_decode_studio_block().

mpeg4_block_count

const uint8_t mpeg4_block_count[4] = { 0, 6, 8, 12 }

static

Definition at line 75 of file mpeg4videodec.c.

Referenced by mpeg4_decode_studio_mb().

mb_type_b_map

const int16_t mb_type_b_map[4]

static

Initial value:

= {
    MB_TYPE_DIRECT2     | MB_TYPE_BIDIR_MV,
    MB_TYPE_BIDIR_MV    | MB_TYPE_16x16,
    MB_TYPE_BACKWARD_MV | MB_TYPE_16x16,
    MB_TYPE_FORWARD_MV  | MB_TYPE_16x16,
}

Definition at line 77 of file mpeg4videodec.c.

ac_state_tab

const uint8_t ac_state_tab[22][2]

static

Initial value:

=
{
    {0, 0},
    {0, 1},
    {1, 1},
    {2, 1},
    {3, 1},
    {4, 1},
    {5, 1},
    {1, 2},
    {2, 2},
    {3, 2},
    {4, 2},
    {5, 2},
    {6, 2},
    {1, 3},
    {2, 4},
    {3, 5},
    {4, 6},
    {5, 7},
    {6, 8},
    {7, 9},
    {8, 10},
    {0, 11}
}

Definition at line 2130 of file mpeg4videodec.c.

Referenced by mpeg4_decode_studio_block().