libavcodec/mpeg12.c File Reference

MPEG-1/2 decoder. More...

#include "internal.h"
#include "avcodec.h"
#include "dsputil.h"
#include "mpegvideo.h"
#include "mpeg12.h"
#include "mpeg12data.h"
#include "mpeg12decdata.h"
#include "bytestream.h"
#include "vdpau_internal.h"
#include "xvmc_internal.h"

Detailed Description

MPEG-1/2 decoder.

Definition in file mpeg12.c.

Define Documentation

#define DECODE_SLICE_ERROR -1

Definition at line 1657 of file mpeg12.c.

Referenced by mpeg_decode_slice().

#define DECODE_SLICE_OK 0

Definition at line 1658 of file mpeg12.c.

Referenced by mpeg_decode_slice().

#define INIT_2D_VLC_RL	(	rl,
		static_size		)

Value:

{\
    static RL_VLC_ELEM rl_vlc_table[static_size];\
    INIT_VLC_STATIC(&rl.vlc, TEX_VLC_BITS, rl.n + 2,\
             &rl.table_vlc[0][1], 4, 2,\
             &rl.table_vlc[0][0], 4, 2, static_size);\
\
    rl.rl_vlc[0]= rl_vlc_table;\
    init_2d_vlc_rl(&rl);\
}

Definition at line 77 of file mpeg12.c.

Referenced by ff_mpeg12_init_vlcs().

#define MB_BTYPE_VLC_BITS 6

Definition at line 49 of file mpeg12.c.

Referenced by ff_mpeg12_init_vlcs(), and mpeg_decode_mb().

#define MB_PAT_VLC_BITS 9

Definition at line 47 of file mpeg12.c.

Referenced by ff_mpeg12_init_vlcs(), and mpeg_decode_mb().

#define MB_PTYPE_VLC_BITS 6

Definition at line 48 of file mpeg12.c.

Referenced by ff_mpeg12_init_vlcs(), and mpeg_decode_mb().

#define MBINCR_VLC_BITS 9

Definition at line 46 of file mpeg12.c.

Referenced by ff_mpeg12_init_vlcs(), and mpeg_decode_slice().

#define MT_16X8 2

Definition at line 204 of file mpeg12.c.

#define MT_DMV 3

Definition at line 205 of file mpeg12.c.

Referenced by mpeg_decode_mb().

#define MT_FIELD 1

Definition at line 202 of file mpeg12.c.

Referenced by mpeg_decode_mb().

#define MT_FRAME 2

Definition at line 203 of file mpeg12.c.

Referenced by mpeg_decode_mb().

#define MV_VLC_BITS 9

Definition at line 45 of file mpeg12.c.

Function Documentation

static int decode_chunks	(	AVCodecContext *	avctx,
		AVFrame *	picture,
		int *	data_size,
		const uint8_t *	buf,
		int	buf_size
	)			`[static]`

Definition at line 2275 of file mpeg12.c.

Referenced by mpeg_decode_frame().

static void exchange_uv ( MpegEncContext * s ) [static]

Definition at line 1594 of file mpeg12.c.

Referenced by mpeg_decode_mb(), and vcr2_init_sequence().

void ff_mpeg12_common_init ( MpegEncContext * s )

Definition at line 121 of file mpeg12.c.

Referenced by ff_mpeg1_encode_init(), and mpeg_decode_init().

av_cold void ff_mpeg12_init_vlcs ( void )

Definition at line 146 of file mpeg12.c.

Referenced by decode_init(), mpeg_decode_init(), and tqi_decode_init().

void ff_mpeg1_clean_buffers ( MpegEncContext * s )

Definition at line 129 of file mpeg12.c.

Referenced by encode_thread(), and mpeg_decode_slice().

int ff_mpeg1_decode_block_intra	(	MpegEncContext *	s,
		DCTELEM *	block,
		int	n
	)

Definition at line 685 of file mpeg12.c.

Referenced by tqi_decode_mb().

int ff_mpeg1_find_frame_end	(	ParseContext *	pc,
		const uint8_t *	buf,
		int	buf_size,
		AVCodecParserContext *	s
	)

Finds the end of the current frame in the bitstream.

Returns:: the position of the first byte of the next frame, or -1

Definition at line 2161 of file mpeg12.c.

Referenced by mpeg_decode_frame(), and mpegvideo_parse().

static void flush ( AVCodecContext * avctx ) [static]

Definition at line 2486 of file mpeg12.c.

static int get_dmv ( MpegEncContext * s ) [inline, static]

Definition at line 183 of file mpeg12.c.

Referenced by mpeg_decode_mb().

static int get_qscale ( MpegEncContext * s ) [inline, static]

Definition at line 191 of file mpeg12.c.

Referenced by ff_rate_control_init(), ff_rate_estimate_qscale(), init_pass2(), mpeg_decode_mb(), and mpeg_decode_slice().

static void init_2d_vlc_rl ( RLTable * rl ) [static]

Definition at line 88 of file mpeg12.c.

static int load_matrix	(	MpegEncContext *	s,
		uint16_t	matrix0[64],
		uint16_t	matrix1[64],
		int	intra
	)			`[static]`

Definition at line 1486 of file mpeg12.c.

static int mpeg1_decode_block_inter	(	MpegEncContext *	s,
		DCTELEM *	block,
		int	n
	)			`[inline, static]`

Definition at line 692 of file mpeg12.c.

Referenced by mpeg_decode_mb().

static int mpeg1_decode_block_intra	(	MpegEncContext *	s,
		DCTELEM *	block,
		int	n
	)			`[inline, static]`

Definition at line 612 of file mpeg12.c.

Referenced by ff_mpeg1_decode_block_intra(), and mpeg_decode_mb().

static int mpeg1_decode_picture	(	AVCodecContext *	avctx,
		const uint8_t *	buf,
		int	buf_size
	)			`[static]`

Definition at line 1350 of file mpeg12.c.

Referenced by decode_chunks().

static int mpeg1_decode_sequence	(	AVCodecContext *	avctx,
		const uint8_t *	buf,
		int	buf_size
	)			`[static]`

Definition at line 1971 of file mpeg12.c.

Referenced by decode_chunks().

static int mpeg1_fast_decode_block_inter	(	MpegEncContext *	s,
		DCTELEM *	block,
		int	n
	)			`[inline, static]`

Definition at line 777 of file mpeg12.c.

Referenced by mpeg_decode_mb().

static int mpeg2_decode_block_intra	(	MpegEncContext *	s,
		DCTELEM *	block,
		int	n
	)			`[inline, static]`

Definition at line 1017 of file mpeg12.c.

Referenced by mpeg_decode_mb().

static int mpeg2_decode_block_non_intra	(	MpegEncContext *	s,
		DCTELEM *	block,
		int	n
	)			`[inline, static]`

Definition at line 857 of file mpeg12.c.

Referenced by mpeg_decode_mb().

static int mpeg2_fast_decode_block_intra	(	MpegEncContext *	s,
		DCTELEM *	block,
		int	n
	)			`[inline, static]`

Definition at line 1097 of file mpeg12.c.

Referenced by mpeg_decode_mb().

static int mpeg2_fast_decode_block_non_intra	(	MpegEncContext *	s,
		DCTELEM *	block,
		int	n
	)			`[inline, static]`

Definition at line 946 of file mpeg12.c.

Referenced by mpeg_decode_mb().

static int mpeg_decode_end ( AVCodecContext * avctx ) [static]

Definition at line 2494 of file mpeg12.c.

static int mpeg_decode_frame	(	AVCodecContext *	avctx,
		void *	data,
		int *	data_size,
		AVPacket *	avpkt
	)			`[static]`

Definition at line 2223 of file mpeg12.c.

static void mpeg_decode_gop	(	AVCodecContext *	avctx,
		const uint8_t *	buf,
		int	buf_size
	)			`[static]`

Definition at line 2126 of file mpeg12.c.

Referenced by decode_chunks().

static av_cold int mpeg_decode_init ( AVCodecContext * avctx ) [static]

Definition at line 1180 of file mpeg12.c.

static int mpeg_decode_mb	(	MpegEncContext *	s,
		DCTELEM	block[12][64]
	)			`[static]`

Definition at line 207 of file mpeg12.c.

Referenced by mpeg_decode_slice().

static int mpeg_decode_motion	(	MpegEncContext *	s,
		int	fcode,
		int	pred
	)			`[static]`

Definition at line 582 of file mpeg12.c.

Referenced by mpeg_decode_mb().

static void mpeg_decode_picture_coding_extension ( Mpeg1Context * s1 ) [static]

Definition at line 1517 of file mpeg12.c.

Referenced by decode_chunks().

static void mpeg_decode_picture_display_extension ( Mpeg1Context * s1 ) [static]

Definition at line 1452 of file mpeg12.c.

Referenced by decode_chunks().

static int mpeg_decode_postinit ( AVCodecContext * avctx ) [static]

Definition at line 1246 of file mpeg12.c.

Referenced by decode_chunks().

static void mpeg_decode_quant_matrix_extension ( MpegEncContext * s ) [static]

Definition at line 1507 of file mpeg12.c.

Referenced by decode_chunks().

static void mpeg_decode_sequence_display_extension ( Mpeg1Context * s1 ) [static]

Definition at line 1428 of file mpeg12.c.

Referenced by decode_chunks().

static void mpeg_decode_sequence_extension ( Mpeg1Context * s1 ) [static]

Definition at line 1392 of file mpeg12.c.

Referenced by decode_chunks().

static int mpeg_decode_slice	(	Mpeg1Context *	s1,
		int	mb_y,
		const uint8_t **	buf,
		int	buf_size
	)			`[static]`

decodes a slice.

MpegEncContext.mb_y must be set to the MB row from the startcode

Returns:: DECODE_SLICE_ERROR if the slice is damaged
DECODE_SLICE_OK if this slice is ok

Definition at line 1665 of file mpeg12.c.

Referenced by decode_chunks(), and slice_decode_thread().

static void mpeg_decode_user_data	(	AVCodecContext *	avctx,
		const uint8_t *	p,
		int	buf_size
	)			`[static]`

Definition at line 2104 of file mpeg12.c.

Referenced by decode_chunks().

static int mpeg_field_start	(	MpegEncContext *	s,
		const uint8_t *	buf,
		int	buf_size
	)			`[static]`

Definition at line 1602 of file mpeg12.c.

Referenced by decode_chunks().

static enum PixelFormat mpeg_get_pixelformat ( AVCodecContext * avctx ) [static]

Definition at line 1223 of file mpeg12.c.

Referenced by vcr2_init_sequence().

static void quant_matrix_rebuild	(	uint16_t *	matrix,
		const uint8_t *	old_perm,
		const uint8_t *	new_perm
	)			`[static]`

Definition at line 1211 of file mpeg12.c.

static int slice_decode_thread	(	AVCodecContext *	c,
		void *	arg
	)			`[static]`

Definition at line 1886 of file mpeg12.c.

Referenced by decode_chunks().

static int slice_end	(	AVCodecContext *	avctx,
		AVFrame *	pict
	)			`[static]`

Handles slice ends.

Returns:: 1 if it seems to be the last slice

Definition at line 1926 of file mpeg12.c.

Referenced by decode_chunks().

static int vcr2_init_sequence ( AVCodecContext * avctx ) [static]

Definition at line 2049 of file mpeg12.c.

Referenced by mpeg_decode_frame().

Variable Documentation

uint8_t ff_mpeg12_static_rl_table_store[2][2][2 *MAX_RUN+MAX_LEVEL+3]

Definition at line 74 of file mpeg12.c.

Referenced by ff_mpeg12_init_vlcs(), and ff_mpeg1_encode_init().

VLC mb_btype_vlc [static]

Definition at line 143 of file mpeg12.c.

VLC mb_pat_vlc [static]

Definition at line 144 of file mpeg12.c.

VLC mb_ptype_vlc [static]

Definition at line 142 of file mpeg12.c.

VLC mbincr_vlc [static]

Definition at line 141 of file mpeg12.c.

AVCodec mpeg1video_decoder

Initial value:

 {
    "mpeg1video",
    AVMEDIA_TYPE_VIDEO,
    CODEC_ID_MPEG1VIDEO,
    sizeof(Mpeg1Context),
    mpeg_decode_init,
    NULL,
    mpeg_decode_end,
    mpeg_decode_frame,
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
    .flush= flush,
    .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
}

Definition at line 2503 of file mpeg12.c.

AVCodec mpeg2video_decoder

Initial value:

 {
    "mpeg2video",
    AVMEDIA_TYPE_VIDEO,
    CODEC_ID_MPEG2VIDEO,
    sizeof(Mpeg1Context),
    mpeg_decode_init,
    NULL,
    mpeg_decode_end,
    mpeg_decode_frame,
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
    .flush= flush,
    .long_name= NULL_IF_CONFIG_SMALL("MPEG-2 video"),
}

Definition at line 2517 of file mpeg12.c.

AVCodec mpegvideo_decoder

Initial value:

 {
    "mpegvideo",
    AVMEDIA_TYPE_VIDEO,
    CODEC_ID_MPEG2VIDEO,
    sizeof(Mpeg1Context),
    mpeg_decode_init,
    NULL,
    mpeg_decode_end,
    mpeg_decode_frame,
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
    .flush= flush,
    .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
}

Definition at line 2532 of file mpeg12.c.

VLC mv_vlc [static]

Definition at line 140 of file mpeg12.c.

enum PixelFormat pixfmt_xvmc_mpg2_420[] [static]

Initial value:

 {
                                           PIX_FMT_XVMC_MPEG2_IDCT,
                                           PIX_FMT_XVMC_MPEG2_MC,
                                           PIX_FMT_NONE}

Definition at line 69 of file mpeg12.c.

Referenced by mpeg_get_pixelformat().


Data Structures
struct	Mpeg1Context
Defines
#define	MV_VLC_BITS 9
#define	MBINCR_VLC_BITS 9
#define	MB_PAT_VLC_BITS 9
#define	MB_PTYPE_VLC_BITS 6
#define	MB_BTYPE_VLC_BITS 6
#define	INIT_2D_VLC_RL(rl, static_size)
#define	MT_FIELD 1
#define	MT_FRAME 2
#define	MT_16X8 2
#define	MT_DMV 3
#define	DECODE_SLICE_ERROR -1
#define	DECODE_SLICE_OK 0
Functions
static int	mpeg1_decode_block_intra (MpegEncContext s, DCTELEM block, int n)
static int	mpeg1_decode_block_inter (MpegEncContext s, DCTELEM block, int n)
static int	mpeg1_fast_decode_block_inter (MpegEncContext s, DCTELEM block, int n)
static int	mpeg2_decode_block_non_intra (MpegEncContext s, DCTELEM block, int n)
static int	mpeg2_decode_block_intra (MpegEncContext s, DCTELEM block, int n)
static int	mpeg2_fast_decode_block_non_intra (MpegEncContext s, DCTELEM block, int n)
static int	mpeg2_fast_decode_block_intra (MpegEncContext s, DCTELEM block, int n)
static int	mpeg_decode_motion (MpegEncContext *s, int fcode, int pred)
static void	exchange_uv (MpegEncContext *s)
static void	init_2d_vlc_rl (RLTable *rl)
void	ff_mpeg12_common_init (MpegEncContext *s)
void	ff_mpeg1_clean_buffers (MpegEncContext *s)
av_cold void	ff_mpeg12_init_vlcs (void)
static int	get_dmv (MpegEncContext *s)
static int	get_qscale (MpegEncContext *s)
static int	mpeg_decode_mb (MpegEncContext *s, DCTELEM block[12][64])
int	ff_mpeg1_decode_block_intra (MpegEncContext s, DCTELEM block, int n)
static av_cold int	mpeg_decode_init (AVCodecContext *avctx)
static void	quant_matrix_rebuild (uint16_t matrix, const uint8_t old_perm, const uint8_t *new_perm)
static enum PixelFormat	mpeg_get_pixelformat (AVCodecContext *avctx)
static int	mpeg_decode_postinit (AVCodecContext *avctx)
static int	mpeg1_decode_picture (AVCodecContext avctx, const uint8_t buf, int buf_size)
static void	mpeg_decode_sequence_extension (Mpeg1Context *s1)
static void	mpeg_decode_sequence_display_extension (Mpeg1Context *s1)
static void	mpeg_decode_picture_display_extension (Mpeg1Context *s1)
static int	load_matrix (MpegEncContext *s, uint16_t matrix0[64], uint16_t matrix1[64], int intra)
static void	mpeg_decode_quant_matrix_extension (MpegEncContext *s)
static void	mpeg_decode_picture_coding_extension (Mpeg1Context *s1)
static int	mpeg_field_start (MpegEncContext s, const uint8_t buf, int buf_size)
static int	mpeg_decode_slice (Mpeg1Context s1, int mb_y, const uint8_t *buf, int buf_size)
	decodes a slice.
static int	slice_decode_thread (AVCodecContext c, void arg)
static int	slice_end (AVCodecContext avctx, AVFrame pict)
	Handles slice ends.
static int	mpeg1_decode_sequence (AVCodecContext avctx, const uint8_t buf, int buf_size)
static int	vcr2_init_sequence (AVCodecContext *avctx)
static void	mpeg_decode_user_data (AVCodecContext avctx, const uint8_t p, int buf_size)
static void	mpeg_decode_gop (AVCodecContext avctx, const uint8_t buf, int buf_size)
int	ff_mpeg1_find_frame_end (ParseContext pc, const uint8_t buf, int buf_size, AVCodecParserContext *s)
	Finds the end of the current frame in the bitstream.
static int	decode_chunks (AVCodecContext avctx, AVFrame picture, int data_size, const uint8_t buf, int buf_size)
static int	mpeg_decode_frame (AVCodecContext avctx, void data, int data_size, AVPacket avpkt)
static void	flush (AVCodecContext *avctx)
static int	mpeg_decode_end (AVCodecContext *avctx)
Variables
static enum PixelFormat	pixfmt_xvmc_mpg2_420 []
uint8_t	ff_mpeg12_static_rl_table_store [2][2][2 *MAX_RUN+MAX_LEVEL+3]
static VLC	mv_vlc
static VLC	mbincr_vlc
static VLC	mb_ptype_vlc
static VLC	mb_btype_vlc
static VLC	mb_pat_vlc
AVCodec	mpeg1video_decoder
AVCodec	mpeg2video_decoder
AVCodec	mpegvideo_decoder

libavcodec/mpeg12.c File Reference

Data Structures

Defines

Functions

Variables

Detailed Description

Define Documentation

Function Documentation

Variable Documentation