libavcodec/mpegvideo.c File Reference

The simplest mpeg encoder (well, it was the simplest!). More...

#include "avcodec.h"
#include "dsputil.h"
#include "mpegvideo.h"
#include "mpegvideo_common.h"
#include "mjpegenc.h"
#include "msmpeg4.h"
#include "faandct.h"
#include <limits.h>

Go to the source code of this file.

Defines

#define COPY(a)   bak->a= src->a
#define COLOR(theta, r)

Functions

static void dct_unquantize_mpeg1_intra_c (MpegEncContext *s, DCTELEM *block, int n, int qscale)
static void dct_unquantize_mpeg1_inter_c (MpegEncContext *s, DCTELEM *block, int n, int qscale)
static void dct_unquantize_mpeg2_intra_c (MpegEncContext *s, DCTELEM *block, int n, int qscale)
static void dct_unquantize_mpeg2_intra_bitexact (MpegEncContext *s, DCTELEM *block, int n, int qscale)
static void dct_unquantize_mpeg2_inter_c (MpegEncContext *s, DCTELEM *block, int n, int qscale)
static void dct_unquantize_h263_intra_c (MpegEncContext *s, DCTELEM *block, int n, int qscale)
static void dct_unquantize_h263_inter_c (MpegEncContext *s, DCTELEM *block, int n, int qscale)
static void draw_edges_c (uint8_t *buf, int wrap, int width, int height, int w)
void ff_init_scantable (uint8_t *permutation, ScanTable *st, const uint8_t *src_scantable)
const uint8_tff_find_start_code (const uint8_t *restrict p, const uint8_t *end, uint32_t *restrict state)
int ff_dct_common_init (MpegEncContext *s)
void copy_picture (Picture *dst, Picture *src)
int alloc_picture (MpegEncContext *s, Picture *pic, int shared)
 allocates a Picture The pixels are allocated/set by calling get_buffer() if shared=0
static void free_picture (MpegEncContext *s, Picture *pic)
 deallocates a picture
static int init_duplicate_context (MpegEncContext *s, MpegEncContext *base)
static void free_duplicate_context (MpegEncContext *s)
static void backup_duplicate_context (MpegEncContext *bak, MpegEncContext *src)
void ff_update_duplicate_context (MpegEncContext *dst, MpegEncContext *src)
void MPV_common_defaults (MpegEncContext *s)
 sets the given MpegEncContext to common defaults (same for encoding and decoding).
void MPV_decode_defaults (MpegEncContext *s)
 sets the given MpegEncContext to defaults for decoding.
int MPV_common_init (MpegEncContext *s)
 init common structure for both encoder and decoder.
void MPV_common_end (MpegEncContext *s)
void init_rl (RLTable *rl, uint8_t static_store[2][2 *MAX_RUN+MAX_LEVEL+3])
void init_vlc_rl (RLTable *rl, int use_static)
int ff_find_unused_picture (MpegEncContext *s, int shared)
static void update_noise_reduction (MpegEncContext *s)
int MPV_frame_start (MpegEncContext *s, AVCodecContext *avctx)
 generic function for encode/decode called after coding/decoding the header and before a frame is coded/decoded
void MPV_frame_end (MpegEncContext *s)
static void draw_line (uint8_t *buf, int sx, int sy, int ex, int ey, int w, int h, int stride, int color)
 draws an line from (ex, ey) -> (sx, sy).
static void draw_arrow (uint8_t *buf, int sx, int sy, int ex, int ey, int w, int h, int stride, int color)
 draws an arrow from (ex, ey) -> (sx, sy).
void ff_print_debug_info (MpegEncContext *s, AVFrame *pict)
 prints debuging info for the given picture.
void ff_emulated_edge_mc (uint8_t *buf, uint8_t *src, int linesize, int block_w, int block_h, int src_x, int src_y, int w, int h)
 Copies a rectangular area of samples to a temporary buffer and replicates the boarder samples.
static int hpel_motion_lowres (MpegEncContext *s, uint8_t *dest, uint8_t *src, int field_based, int field_select, int src_x, int src_y, int width, int height, int stride, int h_edge_pos, int v_edge_pos, int w, int h, h264_chroma_mc_func *pix_op, int motion_x, int motion_y)
static av_always_inline void mpeg_motion_lowres (MpegEncContext *s, uint8_t *dest_y, uint8_t *dest_cb, uint8_t *dest_cr, int field_based, int bottom_field, int field_select, uint8_t **ref_picture, h264_chroma_mc_func *pix_op, int motion_x, int motion_y, int h)
static void chroma_4mv_motion_lowres (MpegEncContext *s, uint8_t *dest_cb, uint8_t *dest_cr, uint8_t **ref_picture, h264_chroma_mc_func *pix_op, int mx, int my)
static void MPV_motion_lowres (MpegEncContext *s, uint8_t *dest_y, uint8_t *dest_cb, uint8_t *dest_cr, int dir, uint8_t **ref_picture, h264_chroma_mc_func *pix_op)
 motion compensation of a single macroblock
static void put_dct (MpegEncContext *s, DCTELEM *block, int i, uint8_t *dest, int line_size, int qscale)
static void add_dct (MpegEncContext *s, DCTELEM *block, int i, uint8_t *dest, int line_size)
static void add_dequant_dct (MpegEncContext *s, DCTELEM *block, int i, uint8_t *dest, int line_size, int qscale)
void ff_clean_intra_table_entries (MpegEncContext *s)
 cleans dc, ac, coded_block for the current non intra MB
static av_always_inline void MPV_decode_mb_internal (MpegEncContext *s, DCTELEM block[12][64], int lowres_flag)
void MPV_decode_mb (MpegEncContext *s, DCTELEM block[12][64])
void ff_draw_horiz_band (MpegEncContext *s, int y, int h)
void ff_init_block_index (MpegEncContext *s)
void ff_mpeg_flush (AVCodecContext *avctx)
void ff_set_qscale (MpegEncContext *s, int qscale)
 set qscale and update qscale dependent variables.

Variables

void(* draw_edges )(uint8_t *buf, int wrap, int width, int height, int w) = draw_edges_c
static const uint8_t ff_default_chroma_qscale_table [32]


Detailed Description

The simplest mpeg encoder (well, it was the simplest!).

Definition in file mpegvideo.c.


Define Documentation

#define COLOR ( theta,
 ) 

Value:

u= (int)(128 + r*cos(theta*3.141592/180));\
v= (int)(128 + r*sin(theta*3.141592/180));

Referenced by ff_print_debug_info().

#define COPY (  )     bak->a= src->a


Function Documentation

static void add_dct ( MpegEncContext s,
DCTELEM block,
int  i,
uint8_t dest,
int  line_size 
) [inline, static]

Definition at line 1797 of file mpegvideo.c.

Referenced by MPV_decode_mb_internal().

static void add_dequant_dct ( MpegEncContext s,
DCTELEM block,
int  i,
uint8_t dest,
int  line_size,
int  qscale 
) [inline, static]

Definition at line 1805 of file mpegvideo.c.

Referenced by MPV_decode_mb_internal().

int alloc_picture ( MpegEncContext s,
Picture pic,
int  shared 
)

allocates a Picture The pixels are allocated/set by calling get_buffer() if shared=0

Definition at line 185 of file mpegvideo.c.

static void backup_duplicate_context ( MpegEncContext bak,
MpegEncContext src 
) [static]

Definition at line 349 of file mpegvideo.c.

Referenced by ff_update_duplicate_context().

static void chroma_4mv_motion_lowres ( MpegEncContext s,
uint8_t dest_cb,
uint8_t dest_cr,
uint8_t **  ref_picture,
h264_chroma_mc_func pix_op,
int  mx,
int  my 
) [inline, static]

Definition at line 1612 of file mpegvideo.c.

Referenced by MPV_motion_lowres().

void copy_picture ( Picture dst,
Picture src 
)

Definition at line 176 of file mpegvideo.c.

Referenced by select_input_picture().

static void dct_unquantize_h263_inter_c ( MpegEncContext s,
DCTELEM block,
int  n,
int  qscale 
) [static]

Definition at line 2390 of file mpegvideo.c.

Referenced by ff_dct_common_init().

static void dct_unquantize_h263_intra_c ( MpegEncContext s,
DCTELEM block,
int  n,
int  qscale 
) [static]

Definition at line 2353 of file mpegvideo.c.

Referenced by ff_dct_common_init().

static void dct_unquantize_mpeg1_inter_c ( MpegEncContext s,
DCTELEM block,
int  n,
int  qscale 
) [static]

Definition at line 2230 of file mpegvideo.c.

Referenced by ff_dct_common_init().

static void dct_unquantize_mpeg1_intra_c ( MpegEncContext s,
DCTELEM block,
int  n,
int  qscale 
) [static]

Definition at line 2198 of file mpegvideo.c.

Referenced by ff_dct_common_init().

static void dct_unquantize_mpeg2_inter_c ( MpegEncContext s,
DCTELEM block,
int  n,
int  qscale 
) [static]

Definition at line 2322 of file mpegvideo.c.

Referenced by ff_dct_common_init().

static void dct_unquantize_mpeg2_intra_bitexact ( MpegEncContext s,
DCTELEM block,
int  n,
int  qscale 
) [static]

Definition at line 2289 of file mpegvideo.c.

Referenced by ff_dct_common_init().

static void dct_unquantize_mpeg2_intra_c ( MpegEncContext s,
DCTELEM block,
int  n,
int  qscale 
) [static]

Definition at line 2259 of file mpegvideo.c.

Referenced by ff_dct_common_init().

static void draw_arrow ( uint8_t buf,
int  sx,
int  sy,
int  ex,
int  ey,
int  w,
int  h,
int  stride,
int  color 
) [static]

draws an arrow from (ex, ey) -> (sx, sy).

Parameters:
w width of the image
h height of the image
stride stride/linesize of the image
color color of the arrow

Definition at line 1115 of file mpegvideo.c.

Referenced by ff_print_debug_info().

static void draw_edges_c ( uint8_t buf,
int  wrap,
int  width,
int  height,
int  w 
) [static]

Definition at line 800 of file mpegvideo.c.

static void draw_line ( uint8_t buf,
int  sx,
int  sy,
int  ex,
int  ey,
int  w,
int  h,
int  stride,
int  color 
) [static]

draws an line from (ex, ey) -> (sx, sy).

Parameters:
w width of the image
h height of the image
stride stride/linesize of the image
color color of the arrow

Definition at line 1066 of file mpegvideo.c.

Referenced by draw_arrow().

void ff_clean_intra_table_entries ( MpegEncContext s  ) 

cleans dc, ac, coded_block for the current non intra MB

Definition at line 1818 of file mpegvideo.c.

Referenced by encode_thread(), mpeg4_decode_partition_a(), and MPV_decode_mb_internal().

int ff_dct_common_init ( MpegEncContext s  ) 

Definition at line 133 of file mpegvideo.c.

Referenced by dnxhd_encode_init(), and MPV_common_init().

void ff_draw_horiz_band ( MpegEncContext s,
int  y,
int  h 
)

Parameters:
h is the normal height, this will be reduced automatically if needed for the last row

Definition at line 2108 of file mpegvideo.c.

Referenced by decode_slice(), ff_intrax8_decode_picture(), mpeg_decode_slice(), svq3_decode_frame(), vc1_decode_b_blocks(), vc1_decode_i_blocks(), vc1_decode_i_blocks_adv(), vc1_decode_p_blocks(), and vc1_decode_skip_blocks().

void ff_emulated_edge_mc ( uint8_t buf,
uint8_t src,
int  linesize,
int  block_w,
int  block_h,
int  src_x,
int  src_y,
int  w,
int  h 
)

Copies a rectangular area of samples to a temporary buffer and replicates the boarder samples.

Parameters:
buf destination buffer
src source buffer
linesize number of bytes between 2 vertically adjacent samples in both the source and destination buffers
block_w width of block
block_h height of block
src_x x coordinate of the top left sample of the block in the source buffer
src_y y coordinate of the top left sample of the block in the source buffer
w width of the source buffer
h height of the source buffer

Definition at line 1414 of file mpegvideo.c.

Referenced by chroma_4mv_motion(), chroma_4mv_motion_lowres(), encode_mb_internal(), ff_mspel_motion(), gmc1_motion(), gmc_mmx(), hpel_motion(), hpel_motion_lowres(), mc_dir_part(), mca(), mpeg_motion(), mpeg_motion_lowres(), MPV_motion(), qpel_motion(), render_slice(), rv34_mc(), svq3_mc_dir_part(), vc1_interp_mc(), vc1_mc_1mv(), vc1_mc_4mv_chroma(), vc1_mc_4mv_luma(), and vp56_mc().

const uint8_t* ff_find_start_code ( const uint8_t *restrict  p,
const uint8_t end,
uint32_t *restrict  state 
)

int ff_find_unused_picture ( MpegEncContext s,
int  shared 
)

void ff_init_block_index ( MpegEncContext s  ) 

void ff_init_scantable ( uint8_t permutation,
ScanTable st,
const uint8_t src_scantable 
)

void ff_mpeg_flush ( AVCodecContext avctx  ) 

Definition at line 2172 of file mpegvideo.c.

Referenced by flush_dpb().

void ff_print_debug_info ( MpegEncContext s,
AVFrame pict 
)

prints debuging info for the given picture.

Definition at line 1144 of file mpegvideo.c.

Referenced by decode_frame(), ff_h263_decode_frame(), ff_rv34_decode_frame(), h261_decode_frame(), rv10_decode_frame(), slice_end(), and vc1_decode_frame().

void ff_set_qscale ( MpegEncContext s,
int  qscale 
)

void ff_update_duplicate_context ( MpegEncContext dst,
MpegEncContext src 
)

Definition at line 371 of file mpegvideo.c.

Referenced by encode_picture(), and mpeg_decode_frame().

static void free_duplicate_context ( MpegEncContext s  )  [static]

Definition at line 333 of file mpegvideo.c.

Referenced by MPV_common_end().

static void free_picture ( MpegEncContext s,
Picture pic 
) [static]

deallocates a picture

Definition at line 273 of file mpegvideo.c.

Referenced by MPV_common_end().

static int hpel_motion_lowres ( MpegEncContext s,
uint8_t dest,
uint8_t src,
int  field_based,
int  field_select,
int  src_x,
int  src_y,
int  width,
int  height,
int  stride,
int  h_edge_pos,
int  v_edge_pos,
int  w,
int  h,
h264_chroma_mc_func pix_op,
int  motion_x,
int  motion_y 
) [inline, static]

Definition at line 1473 of file mpegvideo.c.

Referenced by MPV_motion_lowres().

static int init_duplicate_context ( MpegEncContext s,
MpegEncContext base 
) [static]

Definition at line 303 of file mpegvideo.c.

Referenced by MPV_common_init().

void init_rl ( RLTable rl,
uint8_t  static_store[2][2 *MAX_RUN+MAX_LEVEL+3] 
)

Parameters:
static_store static uint8_t array[2][2*MAX_RUN + MAX_LEVEL + 3] which will hold the level and run tables, if this is NULL av_malloc() will be used

Definition at line 694 of file mpegvideo.c.

Referenced by ff_h261_encode_init(), ff_mpeg1_encode_init(), ff_msmpeg4_decode_init(), h261_decode_init_vlc(), h263_decode_init_vlc(), and init_vlcs().

void init_vlc_rl ( RLTable rl,
int  use_static 
)

Definition at line 745 of file mpegvideo.c.

Referenced by ff_msmpeg4_decode_init(), h261_decode_init_vlc(), and h263_decode_init_vlc().

static av_always_inline void mpeg_motion_lowres ( MpegEncContext s,
uint8_t dest_y,
uint8_t dest_cb,
uint8_t dest_cr,
int  field_based,
int  bottom_field,
int  field_select,
uint8_t **  ref_picture,
h264_chroma_mc_func pix_op,
int  motion_x,
int  motion_y,
int  h 
) [static]

Definition at line 1516 of file mpegvideo.c.

Referenced by MPV_motion_lowres().

void MPV_common_defaults ( MpegEncContext s  ) 

sets the given MpegEncContext to common defaults (same for encoding and decoding).

the changed fields will not depend upon the prior state of the MpegEncContext.

Definition at line 389 of file mpegvideo.c.

Referenced by MPV_decode_defaults(), and MPV_encode_defaults().

void MPV_common_end ( MpegEncContext s  ) 

int MPV_common_init ( MpegEncContext s  ) 

init common structure for both encoder and decoder.

this assumes that some variables like width/height are already set

Definition at line 419 of file mpegvideo.c.

Referenced by decode_pic(), decode_slice_header(), ff_h263_decode_frame(), ff_h263_decode_init(), ff_rv34_decode_init(), h261_decode_frame(), MPV_encode_init(), rv10_decode_init(), rv20_decode_picture_header(), rv34_decode_slice(), svq1_decode_init(), svq3_decode_frame(), and vcr2_init_sequence().

void MPV_decode_defaults ( MpegEncContext s  ) 

sets the given MpegEncContext to defaults for decoding.

the changed fields will not depend upon the prior state of the MpegEncContext.

Definition at line 411 of file mpegvideo.c.

Referenced by decode_init(), ff_cavs_init(), ff_h263_decode_init(), ff_rv34_decode_init(), h261_decode_init(), mpeg_decode_init(), rv10_decode_init(), and svq1_decode_init().

void MPV_decode_mb ( MpegEncContext s,
DCTELEM  block[12][64] 
)

static av_always_inline void MPV_decode_mb_internal ( MpegEncContext s,
DCTELEM  block[12][64],
int  lowres_flag 
) [static]

Definition at line 1858 of file mpegvideo.c.

Referenced by MPV_decode_mb().

void MPV_frame_end ( MpegEncContext s  ) 

int MPV_frame_start ( MpegEncContext s,
AVCodecContext avctx 
)

generic function for encode/decode called after coding/decoding the header and before a frame is coded/decoded

Definition at line 879 of file mpegvideo.c.

Referenced by ff_h263_decode_frame(), frame_start(), h261_decode_frame(), mpeg_field_start(), MPV_encode_picture(), rv10_decode_packet(), rv34_decode_slice(), svq1_decode_frame(), and vc1_decode_frame().

static void MPV_motion_lowres ( MpegEncContext s,
uint8_t dest_y,
uint8_t dest_cb,
uint8_t dest_cr,
int  dir,
uint8_t **  ref_picture,
h264_chroma_mc_func pix_op 
) [inline, static]

motion compensation of a single macroblock

Parameters:
s context
dest_y luma destination pointer
dest_cb chroma cb/u destination pointer
dest_cr chroma cr/v destination pointer
dir direction (0->forward, 1->backward)
ref_picture array[3] of pointers to the 3 planes of the reference picture
pic_op halfpel motion compensation function (average or put normally) the motion vectors are taken from s->mv and the MV type from s->mv_type

Definition at line 1673 of file mpegvideo.c.

Referenced by MPV_decode_mb_internal().

static void put_dct ( MpegEncContext s,
DCTELEM block,
int  i,
uint8_t dest,
int  line_size,
int  qscale 
) [inline, static]

Definition at line 1789 of file mpegvideo.c.

Referenced by MPV_decode_mb_internal().

static void update_noise_reduction ( MpegEncContext s  )  [static]

Definition at line 859 of file mpegvideo.c.


Variable Documentation

void(* draw_edges)(uint8_t *buf, int wrap, int width, int height, int w) = draw_edges_c

Initial value:

{

    0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31
}

Definition at line 73 of file mpegvideo.c.

Referenced by MPV_common_defaults().


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