cavsdec.c File Reference

#include "libavutil/avassert.h"
#include "libavutil/emms.h"
#include "libavutil/mem.h"
#include "avcodec.h"
#include "get_bits.h"
#include "golomb.h"
#include "cavs.h"
#include "codec_internal.h"
#include "decode.h"
#include "mathops.h"
#include "mpeg12data.h"
#include "startcode.h"

Go to the source code of this file.

Macros
#define	EOB   0, 0, 0
#define	TMP_UNUSED_INX   7

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 More...
static int	dequant (AVSContext *h, int16_t *level_buf, uint8_t *run_buf, int16_t *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, ptrdiff_t stride)
	decode coefficients from one 8x8 block, dequantize, inverse transform and add them to sample block More...
static int	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, AVFrame *rframe, int *got_frame, 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	dequant_shift [64]
static const uint16_t	dequant_mul [64]
static const struct dec_2dvlc	intra_dec [7]
static const struct dec_2dvlc	inter_dec [7]
static const struct dec_2dvlc	chroma_dec [5]
const FFCodec	ff_cavs_decoder

Detailed Description

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

Author

Stefan Gehrer stefa.nosp@m.n.ge.nosp@m.hrer@.nosp@m.gmx..nosp@m.de

Definition in file cavsdec.c.

Macro Definition Documentation

EOB

#define EOB   0, 0, 0

Definition at line 81 of file cavsdec.c.

TMP_UNUSED_INX

#define TMP_UNUSED_INX   7

Function Documentation

store_mvs()

static void store_mvs ( AVSContext *  h )

inlinestatic

Definition at line 461 of file cavsdec.c.

Referenced by decode_mb_p().

mv_pred_direct()

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

inlinestatic

Definition at line 469 of file cavsdec.c.

Referenced by decode_mb_b().

mv_pred_sym()

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

inlinestatic

Definition at line 488 of file cavsdec.c.

Referenced by decode_mb_b().

get_ue_code()

static int get_ue_code ( GetBitContext *  gb, int  order  )

inlinestatic

kth-order exponential golomb code

Definition at line 508 of file cavsdec.c.

Referenced by decode_residual_block().

dequant()

static int dequant ( AVSContext *  h, int16_t *  level_buf, uint8_t *  run_buf, int16_t *  dst, int  mul, int  shift, int  coeff_num  )

inlinestatic

Definition at line 521 of file cavsdec.c.

Referenced by calc_dequant(), decode_block(), decode_residual_block(), and lead_decode_frame().

decode_residual_block()

static int decode_residual_block ( AVSContext *  h, GetBitContext *  gb, const struct dec_2dvlc *  r, int  esc_golomb_order, int  qp, uint8_t *  dst, ptrdiff_t  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 551 of file cavsdec.c.

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

decode_residual_chroma()

static int decode_residual_chroma ( AVSContext *  h )

inlinestatic

Definition at line 599 of file cavsdec.c.

Referenced by decode_mb_i(), and decode_residual_inter().

decode_residual_inter()

static int decode_residual_inter ( AVSContext *  h )

inlinestatic

Definition at line 616 of file cavsdec.c.

Referenced by decode_mb_b(), and decode_mb_p().

set_mv_intra()

static void set_mv_intra ( AVSContext *  h )

inlinestatic

Definition at line 646 of file cavsdec.c.

Referenced by decode_mb_i().

decode_mb_i()

static int decode_mb_i ( AVSContext *  h, int  cbp_code  )

static

Definition at line 656 of file cavsdec.c.

Referenced by decode_pic().

set_intra_mode_default()

static void set_intra_mode_default ( AVSContext *  h )

inlinestatic

Definition at line 730 of file cavsdec.c.

Referenced by decode_mb_b(), and decode_mb_p().

decode_mb_p()

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

static

Definition at line 741 of file cavsdec.c.

Referenced by decode_pic().

decode_mb_b()

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

static

Definition at line 786 of file cavsdec.c.

Referenced by decode_pic().

decode_slice_header()

static int decode_slice_header ( AVSContext *  h, GetBitContext *  gb  )

inlinestatic

Definition at line 929 of file cavsdec.c.

Referenced by cavs_decode_frame(), and check_for_slice().

check_for_slice()

static int check_for_slice ( AVSContext *  h )

inlinestatic

Definition at line 958 of file cavsdec.c.

Referenced by decode_pic().

decode_pic()

static int decode_pic ( AVSContext *  h )

static

Definition at line 986 of file cavsdec.c.

Referenced by cavs_decode_frame().

decode_seq_header()

static int decode_seq_header ( AVSContext *  h )

static

Definition at line 1178 of file cavsdec.c.

Referenced by cavs_decode_frame().

cavs_flush()

static void cavs_flush ( AVCodecContext *  avctx )

static

Definition at line 1233 of file cavsdec.c.

cavs_decode_frame()

static int cavs_decode_frame ( AVCodecContext *  avctx, AVFrame *  rframe, int *  got_frame, AVPacket *  avpkt  )

static

Definition at line 1239 of file cavsdec.c.

Variable Documentation

mv_scan

const uint8_t mv_scan[4]

static

Initial value:

= {
    MV_FWD_X0, MV_FWD_X1,
    MV_FWD_X2, MV_FWD_X3
}

Definition at line 41 of file cavsdec.c.

Referenced by decode_mb_b().

cbp_tab

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 46 of file cavsdec.c.

Referenced by decode_mb_i(), and decode_residual_inter().

scan3x3

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

static

Definition at line 57 of file cavsdec.c.

Referenced by decode_mb_i().

dequant_shift

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().

dequant_mul

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().

intra_dec

const struct dec_2dvlc intra_dec[7]

static

Definition at line 83 of file cavsdec.c.

Referenced by decode_mb_i().

inter_dec

const struct dec_2dvlc inter_dec[7]

static

Definition at line 219 of file cavsdec.c.

Referenced by decode_residual_inter().

chroma_dec

const struct dec_2dvlc chroma_dec[5]

static

Definition at line 355 of file cavsdec.c.

Referenced by decode_residual_chroma().

ff_cavs_decoder

const FFCodec ff_cavs_decoder

Initial value:

= {
    .p.name         = "cavs",
    CODEC_LONG_NAME("Chinese AVS (Audio Video Standard) (AVS1-P2, JiZhun profile)"),
    .p.type         = AVMEDIA_TYPE_VIDEO,
    .p.id           = AV_CODEC_ID_CAVS,
    .priv_data_size = sizeof(AVSContext),
    .init           = ff_cavs_init,
    .close          = ff_cavs_end,
    FF_CODEC_DECODE_CB(cavs_decode_frame),
    .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY,
    .flush          = cavs_flush,
    .caps_internal  = FF_CODEC_CAP_INIT_CLEANUP,
}

Definition at line 1323 of file cavsdec.c.