Macros | Functions | Variables
mpeg4videodec.c File Reference
#include "mpegvideo.h"
#include "mpeg4video.h"
#include "h263.h"
#include "thread.h"

Go to the source code of this file.

Macros

#define SPRITE_TRAJ_VLC_BITS   6
 
#define DC_VLC_BITS   9
 
#define MB_TYPE_B_VLC_BITS   4
 

Functions

void ff_mpeg4_pred_ac (MpegEncContext *s, DCTELEM *block, int n, int dir)
 Predict the ac. More...
 
static int mpeg4_is_resync (MpegEncContext *s)
 check if the next stuff is a resync marker or the end. More...
 
static int mpeg4_decode_sprite_trajectory (MpegEncContext *s, GetBitContext *gb)
 
int ff_mpeg4_decode_video_packet_header (MpegEncContext *s)
 Decode the next video packet. More...
 
static int get_amv (MpegEncContext *s, int n)
 Get the average motion vector for a GMC MB. More...
 
static int mpeg4_decode_dc (MpegEncContext *s, int n, int *dir_ptr)
 Decode the dc value. More...
 
static int mpeg4_decode_partition_a (MpegEncContext *s)
 Decode first partition. More...
 
static int mpeg4_decode_partition_b (MpegEncContext *s, int mb_count)
 decode second partition. More...
 
int ff_mpeg4_decode_partitions (MpegEncContext *s)
 Decode the first and second partition. More...
 
static int mpeg4_decode_block (MpegEncContext *s, DCTELEM *block, int n, int coded, int intra, int rvlc)
 Decode a block. More...
 
static int mpeg4_decode_partitioned_mb (MpegEncContext *s, DCTELEM block[6][64])
 decode partition C of one MB. More...
 
static int mpeg4_decode_mb (MpegEncContext *s, DCTELEM block[6][64])
 
static int mpeg4_decode_gop_header (MpegEncContext *s, GetBitContext *gb)
 
static int mpeg4_decode_profile_level (MpegEncContext *s, GetBitContext *gb)
 
static int decode_vol_header (MpegEncContext *s, GetBitContext *gb)
 
static int decode_user_data (MpegEncContext *s, GetBitContext *gb)
 Decode the user data stuff in the header. More...
 
static int decode_vop_header (MpegEncContext *s, GetBitContext *gb)
 
int ff_mpeg4_decode_picture_header (MpegEncContext *s, GetBitContext *gb)
 Decode mpeg4 headers. More...
 
static av_cold int decode_init (AVCodecContext *avctx)
 

Variables

static VLC dc_lum
 
static VLC dc_chrom
 
static VLC sprite_trajectory
 
static VLC mb_type_b_vlc
 
static const int mb_type_b_map [4]
 
static const AVProfile mpeg4_video_profiles []
 
AVCodec ff_mpeg4_decoder
 

Macro Definition Documentation

#define DC_VLC_BITS   9

Definition at line 33 of file mpeg4videodec.c.

Referenced by decode_init(), and mpeg4_decode_dc().

#define MB_TYPE_B_VLC_BITS   4

Definition at line 34 of file mpeg4videodec.c.

Referenced by decode_init(), and mpeg4_decode_mb().

#define SPRITE_TRAJ_VLC_BITS   6

Definition at line 32 of file mpeg4videodec.c.

Referenced by decode_init(), and mpeg4_decode_sprite_trajectory().

Function Documentation

static av_cold int decode_init ( AVCodecContext *  avctx)
static

Definition at line 2201 of file mpeg4videodec.c.

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

Decode the user data stuff in the header.

Also initializes divx/xvid/lavc_version/build.

Definition at line 1839 of file mpeg4videodec.c.

Referenced by ff_mpeg4_decode_picture_header().

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

Definition at line 1526 of file mpeg4videodec.c.

Referenced by ff_mpeg4_decode_picture_header().

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

Definition at line 1893 of file mpeg4videodec.c.

Referenced by ff_mpeg4_decode_picture_header().

int ff_mpeg4_decode_partitions ( MpegEncContext *  s)

Decode the first and second partition.

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

Definition at line 796 of file mpeg4videodec.c.

Referenced by decode_slice().

int ff_mpeg4_decode_picture_header ( MpegEncContext *  s,
GetBitContext *  gb 
)

Decode mpeg4 headers.

Returns
<0 if no VOP found (or a damaged one) FRAME_SKIPPED if a not coded VOP is found 0 if a VOP is found

Definition at line 2112 of file mpeg4videodec.c.

Referenced by av_mpeg4_decode_header(), and ff_h263_decode_frame().

int ff_mpeg4_decode_video_packet_header ( MpegEncContext *  s)

Decode the next video packet.

Returns
<0 if something went wrong

Definition at line 353 of file mpeg4videodec.c.

Referenced by ff_h263_resync().

void ff_mpeg4_pred_ac ( MpegEncContext *  s,
DCTELEM *  block,
int  n,
int  dir 
)

Predict the ac.

Parameters
nblock index (0-3 are luma, 4-5 are chroma)
dirthe ac prediction direction

Definition at line 53 of file mpeg4videodec.c.

Referenced by ff_msmpeg4_decode_block(), and mpeg4_decode_block().

static int get_amv ( MpegEncContext *  s,
int  n 
)
inlinestatic

Get the average motion vector for a GMC MB.

Parameters
neither 0 for the x component or 1 for y
Returns
the average MV for a GMC MB

Definition at line 452 of file mpeg4videodec.c.

Referenced by mpeg4_decode_mb(), and mpeg4_decode_partition_a().

static int mpeg4_decode_block ( MpegEncContext *  s,
DCTELEM *  block,
int  n,
int  coded,
int  intra,
int  rvlc 
)
inlinestatic

Decode a block.

Returns
<0 if an error occurred

Definition at line 849 of file mpeg4videodec.c.

Referenced by mpeg4_decode_mb(), and mpeg4_decode_partitioned_mb().

static int mpeg4_decode_dc ( MpegEncContext *  s,
int  n,
int *  dir_ptr 
)
inlinestatic

Decode the dc value.

Parameters
nblock index (0-3 are luma, 4-5 are chroma)
dir_ptrthe prediction direction will be stored here
Returns
the quantized dc

Definition at line 499 of file mpeg4videodec.c.

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

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

Definition at line 1493 of file mpeg4videodec.c.

Referenced by ff_mpeg4_decode_picture_header().

static int mpeg4_decode_mb ( MpegEncContext *  s,
DCTELEM  block[6][64] 
)
static

Definition at line 1155 of file mpeg4videodec.c.

Referenced by decode_init(), and decode_vop_header().

static int mpeg4_decode_partition_a ( MpegEncContext *  s)
static

Decode first partition.

Returns
number of MBs decoded or <0 if an error occurred

Definition at line 544 of file mpeg4videodec.c.

Referenced by ff_mpeg4_decode_partitions().

static int mpeg4_decode_partition_b ( MpegEncContext *  s,
int  mb_count 
)
static

decode second partition.

Returns
<0 if an error occurred

Definition at line 709 of file mpeg4videodec.c.

Referenced by ff_mpeg4_decode_partitions().

static int mpeg4_decode_partitioned_mb ( MpegEncContext *  s,
DCTELEM  block[6][64] 
)
static

decode partition C of one MB.

Returns
<0 if an error occurred

Definition at line 1073 of file mpeg4videodec.c.

Referenced by decode_vop_header().

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

Definition at line 1510 of file mpeg4videodec.c.

Referenced by ff_mpeg4_decode_picture_header().

static int mpeg4_decode_sprite_trajectory ( MpegEncContext *  s,
GetBitContext *  gb 
)
static

Definition at line 155 of file mpeg4videodec.c.

Referenced by decode_vop_header(), and ff_mpeg4_decode_video_packet_header().

static int mpeg4_is_resync ( MpegEncContext *  s)
inlinestatic

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

Returns
0 if not

Definition at line 112 of file mpeg4videodec.c.

Referenced by mpeg4_decode_mb(), and mpeg4_decode_partitioned_mb().

Variable Documentation

VLC dc_chrom
static

Definition at line 37 of file mpeg4videodec.c.

VLC dc_lum
static

Definition at line 37 of file mpeg4videodec.c.

AVCodec ff_mpeg4_decoder
Initial value:
= {
.name = "mpeg4",
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_MPEG4,
.priv_data_size = sizeof(MpegEncContext),
.init = decode_init,
.close = ff_h263_decode_end,
.decode = ff_h263_decode_frame,
.capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
CODEC_CAP_FRAME_THREADS,
.flush = ff_mpeg_flush,
.long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
.pix_fmts = ff_hwaccel_pixfmt_list_420,
.profiles = NULL_IF_CONFIG_SMALL(mpeg4_video_profiles),
.update_thread_context = ONLY_IF_THREADS_ENABLED(ff_mpeg_update_thread_context),
}

Definition at line 2266 of file mpeg4videodec.c.

const int mb_type_b_map[4]
static
Initial value:
= {
MB_TYPE_DIRECT2 | MB_TYPE_L0L1,
MB_TYPE_L0L1 | MB_TYPE_16x16,
MB_TYPE_L1 | MB_TYPE_16x16,
MB_TYPE_L0 | MB_TYPE_16x16,
}

Definition at line 41 of file mpeg4videodec.c.

Referenced by mpeg4_decode_mb().

VLC mb_type_b_vlc
static

Definition at line 39 of file mpeg4videodec.c.

const AVProfile mpeg4_video_profiles[]
static
Initial value:
= {
{ FF_PROFILE_MPEG4_SIMPLE, "Simple Profile" },
{ FF_PROFILE_MPEG4_SIMPLE_SCALABLE, "Simple Scalable Profile" },
{ FF_PROFILE_MPEG4_CORE, "Core Profile" },
{ FF_PROFILE_MPEG4_MAIN, "Main Profile" },
{ FF_PROFILE_MPEG4_N_BIT, "N-bit Profile" },
{ FF_PROFILE_MPEG4_SCALABLE_TEXTURE, "Scalable Texture Profile" },
{ FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION, "Simple Face Animation Profile" },
{ FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE, "Basic Animated Texture Profile" },
{ FF_PROFILE_MPEG4_HYBRID, "Hybrid Profile" },
{ FF_PROFILE_MPEG4_ADVANCED_REAL_TIME, "Advanced Real Time Simple Profile" },
{ FF_PROFILE_MPEG4_CORE_SCALABLE, "Code Scalable Profile" },
{ FF_PROFILE_MPEG4_ADVANCED_CODING, "Advanced Coding Profile" },
{ FF_PROFILE_MPEG4_ADVANCED_CORE, "Advanced Core Profile" },
{ FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE, "Advanced Scalable Texture Profile" },
{ FF_PROFILE_MPEG4_SIMPLE_STUDIO, "Simple Studio Profile" },
{ FF_PROFILE_MPEG4_ADVANCED_SIMPLE, "Advanced Simple Profile" },
}

Definition at line 2247 of file mpeg4videodec.c.

VLC sprite_trajectory
static

Definition at line 38 of file mpeg4videodec.c.