mpeg4videodec.c File Reference

#include "libavutil/opt.h"
#include "error_resilience.h"
#include "internal.h"
#include "mpegvideo.h"
#include "mpeg4video.h"
#include "h263.h"
#include "thread.h"

Include dependency graph for mpeg4videodec.c:

Go to the source code of this file.

Macros
#define	UNCHECKED_BITSTREAM_READER   1
#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, int16_t *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, int16_t *block, int n, int coded, int intra, int rvlc)
	Decode a block. More...
static int	mpeg4_decode_partitioned_mb (MpegEncContext *s, int16_t block[6][64])
	decode partition C of one MB. More...
static int	mpeg4_decode_mb (MpegEncContext *s, int16_t 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...
av_cold void	ff_mpeg4videodec_static_init (void)
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 []
static const AVOption	mpeg4_options []
static const AVClass	mpeg4_class
static const AVClass	mpeg4_vdpau_class
AVCodec	ff_mpeg4_decoder

Macro Definition Documentation

#define DC_VLC_BITS   9

Definition at line 38 of file mpeg4videodec.c.

Referenced by ff_mpeg4videodec_static_init(), and mpeg4_decode_dc().

#define MB_TYPE_B_VLC_BITS   4

Definition at line 39 of file mpeg4videodec.c.

Referenced by ff_mpeg4videodec_static_init(), and mpeg4_decode_mb().

#define SPRITE_TRAJ_VLC_BITS   6

Definition at line 37 of file mpeg4videodec.c.

Referenced by ff_mpeg4videodec_static_init(), and mpeg4_decode_sprite_trajectory().

#define UNCHECKED_BITSTREAM_READER   1

Definition at line 23 of file mpeg4videodec.c.

Function Documentation

static av_cold int decode_init ( AVCodecContext *  avctx )

static

Definition at line 2286 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 1881 of file mpeg4videodec.c.

Referenced by ff_mpeg4_decode_picture_header().

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

static

Definition at line 1553 of file mpeg4videodec.c.

Referenced by ff_mpeg4_decode_picture_header().

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

static

Definition at line 1935 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 795 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 2171 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 363 of file mpeg4videodec.c.

Referenced by ff_h263_resync().

void ff_mpeg4_pred_ac	(	MpegEncContext *	s,
		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 58 of file mpeg4videodec.c.

Referenced by ff_msmpeg4_decode_block(), and mpeg4_decode_block().

av_cold void ff_mpeg4videodec_static_init

(

void

)

Definition at line 2260 of file mpeg4videodec.c.

Referenced by decode_init(), and mpeg4video_parse_init().

static int get_amv ( MpegEncContext *  s, 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 451 of file mpeg4videodec.c.

Referenced by mpeg4_decode_mb(), and mpeg4_decode_partition_a().

static int mpeg4_decode_block ( MpegEncContext *  s, int16_t *  block, int  n, int  coded, int  intra, int  rvlc  )

inlinestatic

Decode a block.

Returns

<0 if an error occurred

Definition at line 848 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

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 498 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 1519 of file mpeg4videodec.c.

Referenced by ff_mpeg4_decode_picture_header().

static int mpeg4_decode_mb ( MpegEncContext *  s, int16_t  block[6][64]  )

static

Definition at line 1176 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 543 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 708 of file mpeg4videodec.c.

Referenced by ff_mpeg4_decode_partitions().

static int mpeg4_decode_partitioned_mb ( MpegEncContext *  s, int16_t  block[6][64]  )

static

decode partition C of one MB.

Returns

<0 if an error occurred

Definition at line 1094 of file mpeg4videodec.c.

Referenced by decode_vop_header().

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

static

Definition at line 1540 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 165 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 117 of file mpeg4videodec.c.

Referenced by mpeg4_decode_mb(), and mpeg4_decode_partitioned_mb().

Variable Documentation

VLC dc_chrom

static

Definition at line 42 of file mpeg4videodec.c.

VLC dc_lum

static

Definition at line 42 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,
    .max_lowres            = 3,
    .long_name             = NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
    .pix_fmts              = ff_h263_hwaccel_pixfmt_list_420,
    .profiles              = NULL_IF_CONFIG_SMALL(mpeg4_video_profiles),
    .update_thread_context = ONLY_IF_THREADS_ENABLED(ff_mpeg_update_thread_context),
    .priv_class = &mpeg4_class,
}

Definition at line 2352 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 46 of file mpeg4videodec.c.

Referenced by mpeg4_decode_mb().

VLC mb_type_b_vlc

static

Definition at line 44 of file mpeg4videodec.c.

const AVClass mpeg4_class

static

Initial value:

= {
    "MPEG4 Video Decoder",
    av_default_item_name,
    mpeg4_options,
    LIBAVUTIL_VERSION_INT,
}

Definition at line 2338 of file mpeg4videodec.c.

Referenced by decode().

const AVOption mpeg4_options[]

static

Initial value:

= {
    {"quarter_sample", "1/4 subpel MC", offsetof(MpegEncContext, quarter_sample), FF_OPT_TYPE_INT, {.i64 = 0}, 0, 1, 0},
    {"divx_packed", "divx style packed b frames", offsetof(MpegEncContext, divx_packed), FF_OPT_TYPE_INT, {.i64 = 0}, 0, 1, 0},
    {NULL}
}

Definition at line 2332 of file mpeg4videodec.c.

const AVClass mpeg4_vdpau_class

static

Initial value:

= {
    "MPEG4 Video VDPAU Decoder",
    av_default_item_name,
    mpeg4_options,
    LIBAVUTIL_VERSION_INT,
}

Definition at line 2345 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" },
    { FF_PROFILE_UNKNOWN },
}

Definition at line 2312 of file mpeg4videodec.c.

VLC sprite_trajectory

static

Definition at line 43 of file mpeg4videodec.c.