libavcodec/cavsdec.c File Reference

Chinese AVS video (AVS1-P2, JiZhun profile) decoder. More...

#include "libavutil/avassert.h"
#include "avcodec.h"
#include "get_bits.h"
#include "golomb.h"
#include "cavs.h"

Go to the source code of this file.

Defines

#define EOB   0,0,0

Functions

static void store_mvs (AVSContext *h)
static void mv_pred_direct (AVSContext *h, cavs_vector *pmv_fw, cavs_vector *col_mv)
static void mv_pred_sym (AVSContext *h, cavs_vector *src, enum cavs_block size)
static int get_ue_code (GetBitContext *gb, int order)
 kth-order exponential golomb code
static int dequant (AVSContext *h, DCTELEM *level_buf, uint8_t *run_buf, DCTELEM *dst, int mul, int shift, int coeff_num)
static int decode_residual_block (AVSContext *h, GetBitContext *gb, const struct dec_2dvlc *r, int esc_golomb_order, int qp, uint8_t *dst, int stride)
 decode coefficients from one 8x8 block, dequantize, inverse transform and add them to sample block
static void decode_residual_chroma (AVSContext *h)
static int decode_residual_inter (AVSContext *h)
static void set_mv_intra (AVSContext *h)
static int decode_mb_i (AVSContext *h, int cbp_code)
static void set_intra_mode_default (AVSContext *h)
static void decode_mb_p (AVSContext *h, enum cavs_mb mb_type)
static int decode_mb_b (AVSContext *h, enum cavs_mb mb_type)
static int decode_slice_header (AVSContext *h, GetBitContext *gb)
static int check_for_slice (AVSContext *h)
static int decode_pic (AVSContext *h)
static int decode_seq_header (AVSContext *h)
static void cavs_flush (AVCodecContext *avctx)
static int cavs_decode_frame (AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt)

Variables

static const uint8_t mv_scan [4]
static const uint8_t cbp_tab [64][2]
static const uint8_t scan3x3 [4] = { 4, 5, 7, 8 }
static const uint8_t cavs_chroma_qp [64]
static const uint8_t dequant_shift [64]
static const uint16_t dequant_mul [64]
static struct dec_2dvlc intra_dec [7]
static struct dec_2dvlc inter_dec [7]
static struct dec_2dvlc chroma_dec [5]
AVCodec ff_cavs_decoder

Detailed Description

Chinese AVS video (AVS1-P2, JiZhun profile) decoder.

Author:
Stefan Gehrer <stefan.gehrer@gmx.de>

Definition in file cavsdec.c.

Define Documentation

#define EOB   0,0,0

Definition at line 81 of file cavsdec.c.

Function Documentation

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

Definition at line 1112 of file cavsdec.c.

static void cavs_flush ( AVCodecContext *  avctx  )  [static]

Definition at line 1107 of file cavsdec.c.

static int check_for_slice ( AVSContext *  h  )  [inline, static]

Definition at line 897 of file cavsdec.c.

Referenced by decode_pic().

static int decode_mb_b ( AVSContext *  h,
enum cavs_mb  mb_type 
) [static]

Definition at line 752 of file cavsdec.c.

Referenced by decode_pic().

static int decode_mb_i ( AVSContext *  h,
int  cbp_code 
) [static]

Definition at line 631 of file cavsdec.c.

Referenced by decode_pic().

static void decode_mb_p ( AVSContext *  h,
enum cavs_mb  mb_type 
) [static]

Definition at line 708 of file cavsdec.c.

Referenced by decode_pic().

static int decode_pic ( AVSContext *  h  )  [static]

Definition at line 924 of file cavsdec.c.

Referenced by cavs_decode_frame().

static int decode_residual_block ( AVSContext *  h,
GetBitContext *  gb,
const struct dec_2dvlc *  r,
int  esc_golomb_order,
int  qp,
uint8_t *  dst,
int  stride 
) [static]

decode coefficients from one 8x8 block, dequantize, inverse transform and add them to sample block

Parameters:
r pointer to 2D VLC table
esc_golomb_order escape codes are k-golomb with this order k
qp quantizer
dst location of sample block
stride line stride in frame buffer

Definition at line 544 of file cavsdec.c.

Referenced by decode_mb_i(), decode_residual_chroma(), and decode_residual_inter().

static void decode_residual_chroma ( AVSContext *  h  )  [inline, static]

Definition at line 584 of file cavsdec.c.

Referenced by decode_mb_i(), and decode_residual_inter().

static int decode_residual_inter ( AVSContext *  h  )  [inline, static]

Definition at line 593 of file cavsdec.c.

Referenced by decode_mb_b(), and decode_mb_p().

static int decode_seq_header ( AVSContext *  h  )  [static]

Definition at line 1068 of file cavsdec.c.

Referenced by cavs_decode_frame().

static int decode_slice_header ( AVSContext *  h,
GetBitContext *  gb 
) [inline, static]

Definition at line 872 of file cavsdec.c.

Referenced by cavs_decode_frame(), check_for_slice(), decode_nal_units(), and decode_slice().

static int dequant ( AVSContext *  h,
DCTELEM *  level_buf,
uint8_t *  run_buf,
DCTELEM *  dst,
int  mul,
int  shift,
int  coeff_num 
) [inline, static]

Definition at line 515 of file cavsdec.c.

Referenced by decode_residual_block(), lsf_decode_fp(), lsf_decode_fp_16k(), and read_and_decode_spectrum().

static int get_ue_code ( GetBitContext *  gb,
int  order 
) [inline, static]

kth-order exponential golomb code

Definition at line 507 of file cavsdec.c.

Referenced by decode_residual_block().

static void mv_pred_direct ( AVSContext *  h,
cavs_vector *  pmv_fw,
cavs_vector *  col_mv 
) [inline, static]

Definition at line 471 of file cavsdec.c.

Referenced by decode_mb_b().

static void mv_pred_sym ( AVSContext *  h,
cavs_vector *  src,
enum cavs_block  size 
) [inline, static]

Definition at line 489 of file cavsdec.c.

Referenced by decode_mb_b().

static void set_intra_mode_default ( AVSContext *  h  )  [inline, static]

Definition at line 698 of file cavsdec.c.

Referenced by decode_mb_b(), and decode_mb_p().

static void set_mv_intra ( AVSContext *  h  )  [inline, static]

Definition at line 622 of file cavsdec.c.

Referenced by decode_mb_i().

static void store_mvs ( AVSContext *  h  )  [inline, static]

Definition at line 464 of file cavsdec.c.

Referenced by decode_mb_p().

Variable Documentation

const uint8_t cavs_chroma_qp[64] [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,
  32,33,34,35,36,37,38,39,40,41,42,42,43,43,44,44,
  45,45,46,46,47,47,48,48,48,49,49,49,50,50,50,51
}

Definition at line 52 of file cavsdec.c.

Referenced by decode_residual_chroma().

const uint8_t cbp_tab[64][2] [static]

Initial value:

 {
  {63, 0},{15,15},{31,63},{47,31},{ 0,16},{14,32},{13,47},{11,13},
  { 7,14},{ 5,11},{10,12},{ 8, 5},{12,10},{61, 7},{ 4,48},{55, 3},
  { 1, 2},{ 2, 8},{59, 4},{ 3, 1},{62,61},{ 9,55},{ 6,59},{29,62},
  {45,29},{51,27},{23,23},{39,19},{27,30},{46,28},{53, 9},{30, 6},
  {43,60},{37,21},{60,44},{16,26},{21,51},{28,35},{19,18},{35,20},
  {42,24},{26,53},{44,17},{32,37},{58,39},{24,45},{20,58},{17,43},
  {18,42},{48,46},{22,36},{33,33},{25,34},{49,40},{40,52},{36,49},
  {34,50},{50,56},{52,25},{54,22},{41,54},{56,57},{38,41},{57,38}
}

Definition at line 39 of file cavsdec.c.

Referenced by decode_mb_i(), and decode_residual_inter().

struct dec_2dvlc chroma_dec[5] [static]

Definition at line 357 of file cavsdec.c.

const uint16_t dequant_mul[64] [static]

Initial value:

 {
  32768,36061,38968,42495,46341,50535,55437,60424,
  32932,35734,38968,42495,46177,50535,55109,59933,
  65535,35734,38968,42577,46341,50617,55027,60097,
  32809,35734,38968,42454,46382,50576,55109,60056,
  65535,35734,38968,42495,46320,50515,55109,60076,
  65535,35744,38968,42495,46341,50535,55099,60087,
  65535,35734,38973,42500,46341,50535,55109,60097,
  32771,35734,38965,42497,46341,50535,55109,60099
}

Definition at line 70 of file cavsdec.c.

Referenced by decode_residual_block().

const uint8_t dequant_shift[64] [static]

Initial value:

 {
  14,14,14,14,14,14,14,14,
  13,13,13,13,13,13,13,13,
  13,12,12,12,12,12,12,12,
  11,11,11,11,11,11,11,11,
  11,10,10,10,10,10,10,10,
  10, 9, 9, 9, 9, 9, 9, 9,
  9, 8, 8, 8, 8, 8, 8, 8,
  7, 7, 7, 7, 7, 7, 7, 7
}

Definition at line 59 of file cavsdec.c.

Referenced by decode_residual_block().

AVCodec ff_cavs_decoder

Initial value:

 {
    .name           = "cavs",
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_CAVS,
    .priv_data_size = sizeof(AVSContext),
    .init           = ff_cavs_init,
    .close          = ff_cavs_end,
    .decode         = cavs_decode_frame,
    .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_DELAY,
    .flush          = cavs_flush,
    .long_name      = NULL_IF_CONFIG_SMALL("Chinese AVS (Audio Video Standard) (AVS1-P2, JiZhun profile)"),
}

Definition at line 1191 of file cavsdec.c.

struct dec_2dvlc inter_dec[7] [static]

Definition at line 220 of file cavsdec.c.

struct dec_2dvlc intra_dec[7] [static]

Definition at line 83 of file cavsdec.c.

const uint8_t mv_scan[4] [static]

Initial value:

 {
    MV_FWD_X0,MV_FWD_X1,
    MV_FWD_X2,MV_FWD_X3
}

Definition at line 34 of file cavsdec.c.

Referenced by decode_mb_b().

const uint8_t scan3x3[4] = { 4, 5, 7, 8 } [static]

Definition at line 50 of file cavsdec.c.

Referenced by decode_mb_i().

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