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 "xvmc_internal.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)
const uint8_t * ff_find_start_code (const uint8_t *restrict p, const uint8_t *end, uint32_t *restrict state)
av_cold int ff_dct_common_init (MpegEncContext *s)
void ff_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.
av_cold 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 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.
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, int is_mpeg12)
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

static const uint8_t ff_default_chroma_qscale_table [32]
const uint8_t ff_mpeg1_dc_scale_table [128]
enum PixelFormat ff_pixfmt_list_420 []
enum PixelFormat ff_hwaccel_pixfmt_list_420 []

Detailed Description

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

Definition in file mpegvideo.c.

Define Documentation

#define COLOR ( theta,
r   ) 

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 ( a   )     bak->a= src->a

Referenced by backup_duplicate_context(), idct_put_altivec(), and update_duplicate_context_after_me().

Function Documentation

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

Definition at line 1681 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 1689 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 171 of file mpegvideo.c.

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

Definition at line 337 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 1496 of file mpegvideo.c.

Referenced by MPV_motion_lowres().

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

Definition at line 2280 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 2243 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 2120 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 2088 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 2212 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 2179 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 2149 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 1068 of file mpegvideo.c.

Referenced by ff_print_debug_info().

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 1019 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 1702 of file mpegvideo.c.

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

void ff_copy_picture ( Picture *  dst,
Picture *  src 
)

Definition at line 162 of file mpegvideo.c.

Referenced by decode_slice_header(), and select_input_picture().

av_cold int ff_dct_common_init ( MpegEncContext *  s  ) 

Definition at line 119 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 1998 of file mpegvideo.c.

Referenced by decode_slice(), ff_intrax8_decode_picture(), ff_vdpau_h264_picture_complete(), ff_vdpau_mpeg_picture_complete(), ff_vdpau_vc1_decode_picture(), ff_xvmc_decode_mb(), ff_xvmc_field_end(), 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().

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

Definition at line 88 of file mpegvideo.c.

Referenced by cavs_decode_frame(), decode_chunks(), ff_mpeg1_find_frame_end(), ff_rtp_send_mpegvideo(), mpeg_decode_slice(), mpegts_write_packet(), mpegvideo_extract_headers(), parse_nal_units(), and slice_decode_thread().

int ff_find_unused_picture ( MpegEncContext *  s,
int  shared 
)

Definition at line 779 of file mpegvideo.c.

Referenced by ff_h263_decode_frame(), h261_decode_frame(), load_input_picture(), MPV_frame_start(), select_input_picture(), and vc1_decode_frame().

void ff_init_block_index ( MpegEncContext *  s  ) 

Definition at line 2037 of file mpegvideo.c.

Referenced by decode_slice(), encode_thread(), estimate_motion_thread(), ff_h261_reorder_mb_index(), h261_decode_mb(), h261_decode_mb_skipped(), mpeg4_decode_partition_a(), mpeg4_decode_partition_b(), mpeg_decode_slice(), rv10_decode_packet(), rv34_decode_slice(), svq1_encode_plane(), vc1_decode_b_blocks(), vc1_decode_i_blocks(), vc1_decode_i_blocks_adv(), vc1_decode_p_blocks(), and vc1_decode_skip_blocks().

void ff_mpeg_flush ( AVCodecContext *  avctx  ) 

Definition at line 2062 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 1097 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 
)

set qscale and update qscale dependent variables.

Definition at line 2309 of file mpegvideo.c.

Referenced by decode_slice(), encode_mb_internal(), encode_thread(), ff_h261_encode_mb(), ff_mpeg4_decode_mb(), h261_decode_gob(), h261_decode_mb(), h263_decode_dquant(), mpeg4_decode_partition_a(), mpeg4_decode_partition_b(), mpeg4_decode_partitioned_mb(), and rv10_decode_packet().

void ff_update_duplicate_context ( MpegEncContext *  dst,
MpegEncContext *  src 
)

Definition at line 360 of file mpegvideo.c.

Referenced by decode_chunks(), and encode_picture().

static void free_duplicate_context ( MpegEncContext *  s  )  [static]

Definition at line 320 of file mpegvideo.c.

Referenced by MPV_common_end().

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

deallocates a picture

Definition at line 259 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 1357 of file mpegvideo.c.

Referenced by MPV_motion_lowres().

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

Definition at line 289 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 688 of file mpegvideo.c.

Referenced by ff_h261_encode_init(), ff_mpeg12_init_vlcs(), ff_mpeg1_encode_init(), ff_msmpeg4_decode_init(), h261_decode_init_vlc(), and h263_decode_init_vlc().

void init_vlc_rl ( RLTable *  rl  ) 

Definition at line 739 of file mpegvideo.c.

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 1400 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 378 of file mpegvideo.c.

Referenced by MPV_decode_defaults(), and MPV_encode_defaults().

void MPV_common_end ( MpegEncContext *  s  ) 

Definition at line 605 of file mpegvideo.c.

Referenced by decode_end(), decode_slice_header(), ff_h263_decode_end(), ff_h263_decode_frame(), ff_rv34_decode_end(), h261_decode_end(), h261_decode_frame(), mpeg_decode_end(), mpeg_decode_postinit(), MPV_common_init(), MPV_encode_end(), rv10_decode_end(), rv20_decode_picture_header(), rv34_decode_slice(), svq1_decode_end(), vc1_decode_end(), and vcr2_init_sequence().

av_cold 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 408 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_init(), 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 400 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] 
)

Definition at line 1983 of file mpegvideo.c.

Referenced by decode_mb(), decode_slice(), encode_mb_hq(), encode_thread(), h261_decode_mb(), h261_decode_mb_skipped(), mpeg_decode_slice(), and rv10_decode_packet().

static av_always_inline void MPV_decode_mb_internal ( MpegEncContext *  s,
DCTELEM  block[12][64],
int  lowres_flag,
int  is_mpeg12 
) [static]

Definition at line 1743 of file mpegvideo.c.

Referenced by MPV_decode_mb().

void MPV_frame_end ( MpegEncContext *  s  ) 

Definition at line 960 of file mpegvideo.c.

Referenced by decode_frame(), ff_h263_decode_frame(), ff_rv34_decode_frame(), h261_decode_frame(), MPV_encode_picture(), rv10_decode_frame(), rv10_decode_packet(), slice_end(), svq1_decode_frame(), svq3_decode_frame(), and vc1_decode_frame().

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 831 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 1557 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 1673 of file mpegvideo.c.

Referenced by MPV_decode_mb_internal().

static void update_noise_reduction ( MpegEncContext *  s  )  [static]

Definition at line 811 of file mpegvideo.c.

Variable Documentation

const uint8_t ff_default_chroma_qscale_table[32] [static]

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 65 of file mpegvideo.c.

Referenced by MPV_common_defaults().

enum PixelFormat ff_hwaccel_pixfmt_list_420[]

Initial value:

 {
    PIX_FMT_YUV420P,
    PIX_FMT_NONE
}

Definition at line 83 of file mpegvideo.c.

Referenced by mpeg_get_pixelformat().

const uint8_t ff_mpeg1_dc_scale_table[128]

Initial value:

{

    8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
    8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
    8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
    8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
}

Definition at line 70 of file mpegvideo.c.

Referenced by common_init(), ff_h261_encode_init(), flv_h263_decode_picture_header(), h263_decode_picture_header(), intel_h263_decode_picture_header(), MPV_common_defaults(), and rv10_decode_packet().

enum PixelFormat ff_pixfmt_list_420[]

Initial value:

 {
    PIX_FMT_YUV420P,
    PIX_FMT_NONE
}

Definition at line 78 of file mpegvideo.c.

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