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"

Go to the source code of this file.

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_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 void mpeg_decode_quant_matrix_extension (MpegEncContext *s)
static void mpeg_decode_picture_coding_extension (Mpeg1Context *s1)
static void mpeg_decode_extension (AVCodecContext *avctx, const uint8_t *buf, int buf_size)
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 *buf, 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)
 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, const uint8_t *buf, int buf_size)
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

Detailed Description

MPEG-1/2 decoder.

Definition in file mpeg12.c.

Define Documentation

#define DECODE_SLICE_ERROR   -1

Definition at line 1664 of file mpeg12.c.

Referenced by mpeg_decode_slice().

#define DECODE_SLICE_OK   0

Definition at line 1665 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 74 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 201 of file mpeg12.c.

#define MT_DMV   3

Definition at line 202 of file mpeg12.c.

Referenced by mpeg_decode_mb().

#define MT_FIELD   1

Definition at line 199 of file mpeg12.c.

Referenced by mpeg_decode_mb().

#define MT_FRAME   2

Definition at line 200 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 2308 of file mpeg12.c.

Referenced by mpeg_decode_frame().

static void exchange_uv ( MpegEncContext *  s  )  [static]

Definition at line 1601 of file mpeg12.c.

Referenced by mpeg_decode_mb(), and vcr2_init_sequence().

void ff_mpeg12_common_init ( MpegEncContext *  s  ) 

Definition at line 118 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 143 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 126 of file mpeg12.c.

Referenced by encode_thread(), and mpeg_decode_slice().

int ff_mpeg1_decode_block_intra ( MpegEncContext *  s,
DCTELEM *  block,
int  n 
) [inline]

Definition at line 607 of file mpeg12.c.

Referenced by mpeg_decode_mb(), and tqi_decode_mb().

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

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 2199 of file mpeg12.c.

Referenced by mpeg_decode_frame(), and mpegvideo_parse().

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

Definition at line 180 of file mpeg12.c.

Referenced by mpeg_decode_mb().

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

Definition at line 188 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 85 of file mpeg12.c.

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

Definition at line 680 of file mpeg12.c.

Referenced by mpeg_decode_mb().

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

Definition at line 1331 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 1975 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 765 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 1005 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 845 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 1085 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 934 of file mpeg12.c.

Referenced by mpeg_decode_mb().

static int mpeg_decode_end ( AVCodecContext *  avctx  )  [static]

Definition at line 2457 of file mpeg12.c.

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

Definition at line 1572 of file mpeg12.c.

Referenced by decode_chunks().

static int mpeg_decode_frame ( AVCodecContext *  avctx,
void *  data,
int *  data_size,
const uint8_t *  buf,
int  buf_size 
) [static]

Definition at line 2258 of file mpeg12.c.

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

Definition at line 2164 of file mpeg12.c.

Referenced by decode_chunks().

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

Definition at line 1168 of file mpeg12.c.

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

Definition at line 204 of file mpeg12.c.

Referenced by mpeg_decode_slice().

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

Definition at line 577 of file mpeg12.c.

Referenced by mpeg_decode_mb().

static void mpeg_decode_picture_coding_extension ( Mpeg1Context *  s1  )  [static]

Definition at line 1509 of file mpeg12.c.

Referenced by mpeg_decode_extension().

static void mpeg_decode_picture_display_extension ( Mpeg1Context *  s1  )  [static]

Definition at line 1437 of file mpeg12.c.

Referenced by mpeg_decode_extension().

static int mpeg_decode_postinit ( AVCodecContext *  avctx  )  [static]

Definition at line 1229 of file mpeg12.c.

Referenced by mpeg1_decode_picture().

static void mpeg_decode_quant_matrix_extension ( MpegEncContext *  s  )  [static]

Definition at line 1471 of file mpeg12.c.

Referenced by mpeg_decode_extension().

static void mpeg_decode_sequence_display_extension ( Mpeg1Context *  s1  )  [static]

Definition at line 1413 of file mpeg12.c.

Referenced by mpeg_decode_extension().

static void mpeg_decode_sequence_extension ( Mpeg1Context *  s1  )  [static]

Definition at line 1377 of file mpeg12.c.

Referenced by mpeg_decode_extension().

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 1672 of file mpeg12.c.

Referenced by decode_chunks(), and slice_decode_thread().

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

Definition at line 2135 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 1609 of file mpeg12.c.

Referenced by decode_chunks().

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

Definition at line 1206 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 1194 of file mpeg12.c.

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

Definition at line 1891 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 1930 of file mpeg12.c.

Referenced by decode_chunks().

static int vcr2_init_sequence ( AVCodecContext *  avctx  )  [static]

Definition at line 2083 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 71 of file mpeg12.c.

Referenced by ff_mpeg12_init_vlcs(), and ff_mpeg1_encode_init().

VLC mb_btype_vlc [static]

Definition at line 140 of file mpeg12.c.

VLC mb_pat_vlc [static]

Definition at line 141 of file mpeg12.c.

VLC mb_ptype_vlc [static]

Definition at line 139 of file mpeg12.c.

VLC mbincr_vlc [static]

Definition at line 138 of file mpeg12.c.

AVCodec mpeg1video_decoder

Initial value:

 {
    "mpeg1video",
    CODEC_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= ff_mpeg_flush,
    .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
}

Definition at line 2466 of file mpeg12.c.

AVCodec mpeg2video_decoder

Initial value:

 {
    "mpeg2video",
    CODEC_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= ff_mpeg_flush,
    .long_name= NULL_IF_CONFIG_SMALL("MPEG-2 video"),
}

Definition at line 2480 of file mpeg12.c.

AVCodec mpegvideo_decoder

Initial value:

 {
    "mpegvideo",
    CODEC_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= ff_mpeg_flush,
    .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
}

Definition at line 2495 of file mpeg12.c.

VLC mv_vlc [static]

Definition at line 137 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 66 of file mpeg12.c.

Referenced by mpeg_get_pixelformat().

Generated on Fri Oct 26 02:35:43 2012 for FFmpeg by  doxygen 1.5.8