vp8.c File Reference
#include "libavutil/imgutils.h"
#include "avcodec.h"
#include "internal.h"
#include "vp8.h"
#include "vp8data.h"
#include "rectangle.h"
#include "thread.h"

Go to the source code of this file.

Macros

#define MV_EDGE_CHECK(n)
#define XCHG(a, b, xchg)
#define MARGIN   (16 << 2)
#define REBASE(pic)   pic ? pic - &s_src->frames[0] + &s->frames[0] : NULL

Functions

static void free_buffers (VP8Context *s)
 VP8 compatible video decoder.
static int vp8_alloc_frame (VP8Context *s, AVFrame *f)
static void vp8_release_frame (VP8Context *s, AVFrame *f, int prefer_delayed_free, int can_direct_free)
static void vp8_decode_flush_impl (AVCodecContext *avctx, int prefer_delayed_free, int can_direct_free, int free_mem)
static void vp8_decode_flush (AVCodecContext *avctx)
static int update_dimensions (VP8Context *s, int width, int height)
static void parse_segment_info (VP8Context *s)
static void update_lf_deltas (VP8Context *s)
static int setup_partitions (VP8Context *s, const uint8_t *buf, int buf_size)
static void get_quants (VP8Context *s)
static VP56Frame ref_to_update (VP8Context *s, int update, VP56Frame ref)
 Determine which buffers golden and altref should be updated with after this frame.
static void update_refs (VP8Context *s)
static int decode_frame_header (VP8Context *s, const uint8_t *buf, int buf_size)
static av_always_inline void clamp_mv (VP8Context *s, VP56mv *dst, const VP56mv *src)
static int read_mv_component (VP56RangeCoder *c, const uint8_t *p)
 Motion vector coding, 17.1.
static av_always_inline const
uint8_t * 
get_submv_prob (uint32_t left, uint32_t top)
static av_always_inline int decode_splitmvs (VP8Context *s, VP56RangeCoder *c, VP8Macroblock *mb)
 Split motion vector prediction, 16.4.
static av_always_inline void decode_mvs (VP8Context *s, VP8Macroblock *mb, int mb_x, int mb_y)
static av_always_inline void decode_intra4x4_modes (VP8Context *s, VP56RangeCoder *c, int mb_x, int keyframe)
static av_always_inline void decode_mb_mode (VP8Context *s, VP8Macroblock *mb, int mb_x, int mb_y, uint8_t *segment, uint8_t *ref)
static int decode_block_coeffs_internal (VP56RangeCoder *c, DCTELEM block[16], uint8_t probs[16][3][NUM_DCT_TOKENS-1], int i, uint8_t *token_prob, int16_t qmul[2])
static av_always_inline int decode_block_coeffs (VP56RangeCoder *c, DCTELEM block[16], uint8_t probs[16][3][NUM_DCT_TOKENS-1], int i, int zero_nhood, int16_t qmul[2])
static av_always_inline void decode_mb_coeffs (VP8Context *s, VP56RangeCoder *c, VP8Macroblock *mb, uint8_t t_nnz[9], uint8_t l_nnz[9])
static av_always_inline void backup_mb_border (uint8_t *top_border, uint8_t *src_y, uint8_t *src_cb, uint8_t *src_cr, int linesize, int uvlinesize, int simple)
static av_always_inline void xchg_mb_border (uint8_t *top_border, uint8_t *src_y, uint8_t *src_cb, uint8_t *src_cr, int linesize, int uvlinesize, int mb_x, int mb_y, int mb_width, int simple, int xchg)
static av_always_inline int check_dc_pred8x8_mode (int mode, int mb_x, int mb_y)
static av_always_inline int check_tm_pred8x8_mode (int mode, int mb_x, int mb_y)
static av_always_inline int check_intra_pred8x8_mode (int mode, int mb_x, int mb_y)
static av_always_inline int check_intra_pred8x8_mode_emuedge (int mode, int mb_x, int mb_y)
static av_always_inline int check_tm_pred4x4_mode (int mode, int mb_x, int mb_y)
static av_always_inline int check_intra_pred4x4_mode_emuedge (int mode, int mb_x, int mb_y, int *copy_buf)
static av_always_inline void intra_predict (VP8Context *s, uint8_t *dst[3], VP8Macroblock *mb, int mb_x, int mb_y)
static av_always_inline void vp8_mc_luma (VP8Context *s, uint8_t *dst, AVFrame *ref, const VP56mv *mv, int x_off, int y_off, int block_w, int block_h, int width, int height, int linesize, vp8_mc_func mc_func[3][3])
 luma MC function
static av_always_inline void vp8_mc_chroma (VP8Context *s, uint8_t *dst1, uint8_t *dst2, AVFrame *ref, const VP56mv *mv, int x_off, int y_off, int block_w, int block_h, int width, int height, int linesize, vp8_mc_func mc_func[3][3])
 chroma MC function
static av_always_inline void vp8_mc_part (VP8Context *s, uint8_t *dst[3], AVFrame *ref_frame, int x_off, int y_off, int bx_off, int by_off, int block_w, int block_h, int width, int height, VP56mv *mv)
static av_always_inline void prefetch_motion (VP8Context *s, VP8Macroblock *mb, int mb_x, int mb_y, int mb_xy, int ref)
static av_always_inline void inter_predict (VP8Context *s, uint8_t *dst[3], VP8Macroblock *mb, int mb_x, int mb_y)
 Apply motion vectors to prediction buffer, chapter 18.
static av_always_inline void idct_mb (VP8Context *s, uint8_t *dst[3], VP8Macroblock *mb)
static av_always_inline void filter_level_for_mb (VP8Context *s, VP8Macroblock *mb, VP8FilterStrength *f)
static av_always_inline void filter_mb (VP8Context *s, uint8_t *dst[3], VP8FilterStrength *f, int mb_x, int mb_y)
static av_always_inline void filter_mb_simple (VP8Context *s, uint8_t *dst, VP8FilterStrength *f, int mb_x, int mb_y)
static void filter_mb_row (VP8Context *s, AVFrame *curframe, int mb_y)
static void filter_mb_row_simple (VP8Context *s, AVFrame *curframe, int mb_y)
static void release_queued_segmaps (VP8Context *s, int is_close)
static int vp8_decode_frame (AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt)
static av_cold int vp8_decode_init (AVCodecContext *avctx)
static av_cold int vp8_decode_free (AVCodecContext *avctx)
static av_cold int vp8_decode_init_thread_copy (AVCodecContext *avctx)
static int vp8_decode_update_thread_context (AVCodecContext *dst, const AVCodecContext *src)

Variables

static const uint8_t subpel_idx [3][8]
AVCodec ff_vp8_decoder

Macro Definition Documentation

#define MARGIN   (16 << 2)

Referenced by vp8_decode_frame().

#define MV_EDGE_CHECK (   n)
Value:
{\
VP8Macroblock *edge = mb_edge[n];\
int edge_ref = edge->ref_frame;\
if (edge_ref != VP56_FRAME_CURRENT) {\
uint32_t mv = AV_RN32A(&edge->mv);\
if (mv) {\
if (cur_sign_bias != sign_bias[edge_ref]) {\
/* SWAR negate of the values in mv. */\
mv = ~mv;\
mv = ((mv&0x7fff7fff) + 0x00010001) ^ (mv&0x80008000);\
}\
if (!n || mv != AV_RN32A(&near_mv[idx]))\
AV_WN32A(&near_mv[++idx], mv);\
cnt[idx] += 1 + (n != 2);\
} else\
cnt[CNT_ZERO] += 1 + (n != 2);\
}\
}

Referenced by decode_mvs().

#define REBASE (   pic)    pic ? pic - &s_src->frames[0] + &s->frames[0] : NULL

Definition at line 1809 of file vp8.c.

Referenced by vp8_decode_update_thread_context().

#define XCHG (   a,
  b,
  xchg 
)
Value:
do { \
if (xchg) AV_SWAP64(b,a); \
else AV_COPY64(b,a); \
} while (0)

Function Documentation

static av_always_inline void backup_mb_border ( uint8_t *  top_border,
uint8_t *  src_y,
uint8_t *  src_cb,
uint8_t *  src_cr,
int  linesize,
int  uvlinesize,
int  simple 
)
static

Definition at line 837 of file vp8.c.

Referenced by filter_mb_row(), and filter_mb_row_simple().

static av_always_inline int check_dc_pred8x8_mode ( int  mode,
int  mb_x,
int  mb_y 
)
static

Definition at line 879 of file vp8.c.

Referenced by check_intra_pred8x8_mode(), and check_intra_pred8x8_mode_emuedge().

static av_always_inline int check_intra_pred4x4_mode_emuedge ( int  mode,
int  mb_x,
int  mb_y,
int *  copy_buf 
)
static

Definition at line 935 of file vp8.c.

Referenced by intra_predict().

static av_always_inline int check_intra_pred8x8_mode ( int  mode,
int  mb_x,
int  mb_y 
)
static

Definition at line 899 of file vp8.c.

Referenced by intra_predict().

static av_always_inline int check_intra_pred8x8_mode_emuedge ( int  mode,
int  mb_x,
int  mb_y 
)
static

Definition at line 909 of file vp8.c.

Referenced by intra_predict().

static av_always_inline int check_tm_pred4x4_mode ( int  mode,
int  mb_x,
int  mb_y 
)
static

Definition at line 925 of file vp8.c.

Referenced by check_intra_pred4x4_mode_emuedge().

static av_always_inline int check_tm_pred8x8_mode ( int  mode,
int  mb_x,
int  mb_y 
)
static

Definition at line 889 of file vp8.c.

Referenced by check_intra_pred8x8_mode_emuedge().

static av_always_inline void clamp_mv ( VP8Context s,
VP56mv dst,
const VP56mv src 
)
static

Definition at line 408 of file vp8.c.

Referenced by decode_mvs().

static av_always_inline int decode_block_coeffs ( VP56RangeCoder c,
DCTELEM  block[16],
uint8_t  probs[16][3][NUM_DCT_TOKENS-1],
int  i,
int  zero_nhood,
int16_t  qmul[2] 
)
static
Parameters
carithmetic bitstream reader context
blockdestination for block coefficients
probsprobabilities to use when reading trees from the bitstream
iinitial coeff index, 0 unless a separate DC block is coded
zero_nhoodthe initial prediction context for number of surrounding all-zero blocks (only left/top, so 0-2)
qmularray holding the dc/ac dequant factor at position 0/1
Returns
0 if no coeffs were decoded otherwise, the index of the last coeff decoded plus one

Definition at line 765 of file vp8.c.

Referenced by decode_mb_coeffs().

static int decode_block_coeffs_internal ( VP56RangeCoder c,
DCTELEM  block[16],
uint8_t  probs[16][3][NUM_DCT_TOKENS-1],
int  i,
uint8_t *  token_prob,
int16_t  qmul[2] 
)
static
Parameters
carithmetic bitstream reader context
blockdestination for block coefficients
probsprobabilities to use when reading trees from the bitstream
iinitial coeff index, 0 unless a separate DC block is coded
qmularray holding the dc/ac dequant factor at position 0/1
Returns
0 if no coeffs were decoded otherwise, the index of the last coeff decoded plus one

Definition at line 699 of file vp8.c.

Referenced by decode_block_coeffs().

static int decode_frame_header ( VP8Context s,
const uint8_t *  buf,
int  buf_size 
)
static

Definition at line 270 of file vp8.c.

Referenced by vp8_decode_frame().

static av_always_inline void decode_intra4x4_modes ( VP8Context s,
VP56RangeCoder c,
int  mb_x,
int  keyframe 
)
static

Definition at line 614 of file vp8.c.

Referenced by decode_mb_mode().

static av_always_inline void decode_mb_coeffs ( VP8Context s,
VP56RangeCoder c,
VP8Macroblock mb,
uint8_t  t_nnz[9],
uint8_t  l_nnz[9] 
)
static

Definition at line 776 of file vp8.c.

Referenced by vp8_decode_frame().

static av_always_inline void decode_mb_mode ( VP8Context s,
VP8Macroblock mb,
int  mb_x,
int  mb_y,
uint8_t *  segment,
uint8_t *  ref 
)
static

Definition at line 639 of file vp8.c.

Referenced by vp8_decode_frame().

static av_always_inline void decode_mvs ( VP8Context s,
VP8Macroblock mb,
int  mb_x,
int  mb_y 
)
static

Definition at line 524 of file vp8.c.

Referenced by decode_mb_mode().

static av_always_inline int decode_splitmvs ( VP8Context s,
VP56RangeCoder c,
VP8Macroblock mb 
)
static

Split motion vector prediction, 16.4.

Returns
the number of motion vectors parsed (2, 4 or 16)

Definition at line 460 of file vp8.c.

Referenced by decode_mvs().

static av_always_inline void filter_level_for_mb ( VP8Context s,
VP8Macroblock mb,
VP8FilterStrength f 
)
static

Definition at line 1393 of file vp8.c.

Referenced by vp8_decode_frame().

static av_always_inline void filter_mb ( VP8Context s,
uint8_t *  dst[3],
VP8FilterStrength f,
int  mb_x,
int  mb_y 
)
static

Definition at line 1423 of file vp8.c.

Referenced by filter_mb_row().

static void filter_mb_row ( VP8Context s,
AVFrame curframe,
int  mb_y 
)
static

Definition at line 1524 of file vp8.c.

Referenced by vp8_decode_frame().

static void filter_mb_row_simple ( VP8Context s,
AVFrame curframe,
int  mb_y 
)
static

Definition at line 1543 of file vp8.c.

Referenced by vp8_decode_frame().

static av_always_inline void filter_mb_simple ( VP8Context s,
uint8_t *  dst,
VP8FilterStrength f,
int  mb_x,
int  mb_y 
)
static

Definition at line 1493 of file vp8.c.

Referenced by filter_mb_row_simple().

static void free_buffers ( VP8Context s)
static

VP8 compatible video decoder.

Copyright (C) 2010 David Conrad Copyright (C) 2010 Ronald S. Bultje Copyright (C) 2010 Jason Garrett-Glaser

This file is part of Libav.

Libav is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version.

Libav is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with Libav; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

Definition at line 37 of file vp8.c.

Referenced by vp8_decode_flush_impl(), and vp8_decode_update_thread_context().

static void get_quants ( VP8Context s)
static

Definition at line 198 of file vp8.c.

Referenced by decode_frame_header().

static av_always_inline const uint8_t* get_submv_prob ( uint32_t  left,
uint32_t  top 
)
static

Definition at line 446 of file vp8.c.

Referenced by decode_splitmvs().

static av_always_inline void idct_mb ( VP8Context s,
uint8_t *  dst[3],
VP8Macroblock mb 
)
static

Definition at line 1341 of file vp8.c.

Referenced by vp8_decode_frame().

static av_always_inline void inter_predict ( VP8Context s,
uint8_t *  dst[3],
VP8Macroblock mb,
int  mb_x,
int  mb_y 
)
static

Apply motion vectors to prediction buffer, chapter 18.

Definition at line 1261 of file vp8.c.

Referenced by vp8_decode_frame().

static av_always_inline void intra_predict ( VP8Context s,
uint8_t *  dst[3],
VP8Macroblock mb,
int  mb_x,
int  mb_y 
)
static

Definition at line 969 of file vp8.c.

Referenced by vp8_decode_frame().

static void parse_segment_info ( VP8Context s)
static

Definition at line 139 of file vp8.c.

Referenced by decode_frame_header().

static av_always_inline void prefetch_motion ( VP8Context s,
VP8Macroblock mb,
int  mb_x,
int  mb_y,
int  mb_xy,
int  ref 
)
static

Definition at line 1239 of file vp8.c.

Referenced by vp8_decode_frame().

static int read_mv_component ( VP56RangeCoder c,
const uint8_t *  p 
)
static

Motion vector coding, 17.1.

Definition at line 417 of file vp8.c.

Referenced by decode_mvs(), and decode_splitmvs().

static VP56Frame ref_to_update ( VP8Context s,
int  update,
VP56Frame  ref 
)
static

Determine which buffers golden and altref should be updated with after this frame.

The spec isn't clear here, so I'm going by my understanding of what libvpx does

Intra frames update all 3 references Inter frames update VP56_FRAME_PREVIOUS if the update_last flag is set If the update (golden|altref) flag is set, it's updated with the current frame if update_last is set, and VP56_FRAME_PREVIOUS otherwise. If the flag is not set, the number read means: 0: no update 1: VP56_FRAME_PREVIOUS 2: update golden with altref, or update altref with golden

Definition at line 243 of file vp8.c.

Referenced by update_refs().

static void release_queued_segmaps ( VP8Context s,
int  is_close 
)
static

Definition at line 1556 of file vp8.c.

Referenced by vp8_decode_frame(), and vp8_decode_free().

static int setup_partitions ( VP8Context s,
const uint8_t *  buf,
int  buf_size 
)
static

Definition at line 172 of file vp8.c.

Referenced by decode_frame_header().

static int update_dimensions ( VP8Context s,
int  width,
int  height 
)
static

Definition at line 109 of file vp8.c.

Referenced by decode_frame_header().

static void update_lf_deltas ( VP8Context s)
static

Definition at line 160 of file vp8.c.

Referenced by decode_frame_header().

static void update_refs ( VP8Context s)
static

Definition at line 259 of file vp8.c.

Referenced by decode_frame_header().

static int vp8_alloc_frame ( VP8Context s,
AVFrame f 
)
static

Definition at line 49 of file vp8.c.

Referenced by vp8_decode_frame().

static void vp8_decode_flush ( AVCodecContext avctx)
static

Definition at line 104 of file vp8.c.

static void vp8_decode_flush_impl ( AVCodecContext avctx,
int  prefer_delayed_free,
int  can_direct_free,
int  free_mem 
)
static

Definition at line 85 of file vp8.c.

Referenced by update_dimensions(), vp8_decode_flush(), and vp8_decode_free().

static int vp8_decode_frame ( AVCodecContext avctx,
void data,
int *  data_size,
AVPacket avpkt 
)
static

Definition at line 1564 of file vp8.c.

static av_cold int vp8_decode_free ( AVCodecContext avctx)
static

Definition at line 1793 of file vp8.c.

static av_cold int vp8_decode_init ( AVCodecContext avctx)
static

Definition at line 1779 of file vp8.c.

static av_cold int vp8_decode_init_thread_copy ( AVCodecContext avctx)
static

Definition at line 1800 of file vp8.c.

static int vp8_decode_update_thread_context ( AVCodecContext dst,
const AVCodecContext src 
)
static

Definition at line 1812 of file vp8.c.

static av_always_inline void vp8_mc_chroma ( VP8Context s,
uint8_t *  dst1,
uint8_t *  dst2,
AVFrame ref,
const VP56mv mv,
int  x_off,
int  y_off,
int  block_w,
int  block_h,
int  width,
int  height,
int  linesize,
vp8_mc_func  mc_func[3][3] 
)
static

chroma MC function

Parameters
sVP8 decoding context
dst1target buffer for block data at block position (U plane)
dst2target buffer for block data at block position (V plane)
refreference picture buffer at origin (0, 0)
mvmotion vector (relative to block position) to get pixel data from
x_offhorizontal position of block from origin (0, 0)
y_offvertical position of block from origin (0, 0)
block_wwidth of block (16, 8 or 4)
block_hheight of block (always same as block_w)
widthwidth of src/dst plane data
heightheight of src/dst plane data
linesizesize of a single line of plane data, including padding
mc_funcmotion compensation function pointers (bilinear or sixtap MC)

Definition at line 1164 of file vp8.c.

Referenced by inter_predict(), and vp8_mc_part().

static av_always_inline void vp8_mc_luma ( VP8Context s,
uint8_t *  dst,
AVFrame ref,
const VP56mv mv,
int  x_off,
int  y_off,
int  block_w,
int  block_h,
int  width,
int  height,
int  linesize,
vp8_mc_func  mc_func[3][3] 
)
static

luma MC function

Parameters
sVP8 decoding context
dsttarget buffer for block data at block position
refreference picture buffer at origin (0, 0)
mvmotion vector (relative to block position) to get pixel data from
x_offhorizontal position of block from origin (0, 0)
y_offvertical position of block from origin (0, 0)
block_wwidth of block (16, 8 or 4)
block_hheight of block (always same as block_w)
widthwidth of src/dst plane data
heightheight of src/dst plane data
linesizesize of a single line of plane data, including padding
mc_funcmotion compensation function pointers (bilinear or sixtap MC)

Definition at line 1114 of file vp8.c.

Referenced by inter_predict(), and vp8_mc_part().

static av_always_inline void vp8_mc_part ( VP8Context s,
uint8_t *  dst[3],
AVFrame ref_frame,
int  x_off,
int  y_off,
int  bx_off,
int  by_off,
int  block_w,
int  block_h,
int  width,
int  height,
VP56mv mv 
)
static

Definition at line 1207 of file vp8.c.

Referenced by inter_predict().

static void vp8_release_frame ( VP8Context s,
AVFrame f,
int  prefer_delayed_free,
int  can_direct_free 
)
static

Definition at line 63 of file vp8.c.

Referenced by vp8_decode_flush_impl(), and vp8_decode_frame().

static av_always_inline void xchg_mb_border ( uint8_t *  top_border,
uint8_t *  src_y,
uint8_t *  src_cb,
uint8_t *  src_cr,
int  linesize,
int  uvlinesize,
int  mb_x,
int  mb_y,
int  mb_width,
int  simple,
int  xchg 
)
static

Definition at line 848 of file vp8.c.

Referenced by intra_predict().

Variable Documentation

AVCodec ff_vp8_decoder
Initial value:
{
.name = "vp8",
.id = CODEC_ID_VP8,
.priv_data_size = sizeof(VP8Context),
.long_name = NULL_IF_CONFIG_SMALL("On2 VP8"),
}

Definition at line 1836 of file vp8.c.

const uint8_t subpel_idx[3][8]
static
Initial value:
{
{ 0, 1, 2, 1, 2, 1, 2, 1 },
{ 0, 3, 5, 3, 5, 3, 5, 3 },
{ 0, 2, 3, 2, 3, 2, 3, 2 },
}

Definition at line 1090 of file vp8.c.

Referenced by vp8_mc_chroma(), and vp8_mc_luma().