libavcodec/cavsdec.c File Reference

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

#include "avcodec.h"
#include "get_bits.h"
#include "golomb.h"
#include "cavs.h"

Go to the source code of this file.

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	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 int	decode_mb_i (AVSContext *h, int cbp_code)
static void	decode_mb_p (AVSContext *h, enum cavs_mb mb_type)
static void	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]
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.

---

Function Documentation

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

Definition at line 651 of file cavsdec.c.

static void cavs_flush

(

AVCodecContext *

avctx

)

[static]

Definition at line 646 of file cavsdec.c.

static int check_for_slice

(

AVSContext *

h

)

[inline, static]

Definition at line 439 of file cavsdec.c.

Referenced by decode_pic().

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

Definition at line 304 of file cavsdec.c.

Referenced by decode_pic().

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

Definition at line 193 of file cavsdec.c.

Referenced by decode_pic().

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

Definition at line 260 of file cavsdec.c.

Referenced by decode_pic().

static int decode_pic

(

AVSContext *

h

)

[static]

Definition at line 466 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 115 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 155 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 164 of file cavsdec.c.

Referenced by decode_mb_b(), and decode_mb_p().

static int decode_seq_header

(

AVSContext *

h

)

[static]

Definition at line 609 of file cavsdec.c.

Referenced by cavs_decode_frame().

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

Definition at line 418 of file cavsdec.c.

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

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

kth-order exponential golomb code

Definition at line 98 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 62 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 80 of file cavsdec.c.

Referenced by decode_mb_b().

static void store_mvs

(

AVSContext *

h

)

[inline, static]

Definition at line 55 of file cavsdec.c.

Referenced by decode_mb_p().

---

Variable Documentation

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 38 of file cavsdec.c.

Referenced by decode_mb_i(), and decode_residual_inter().

AVCodec ff_cavs_decoder

Initial value:

 {
    .name           = "cavs",
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = 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 video (AVS1-P2, JiZhun profile)"),
}

Definition at line 728 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 33 of file cavsdec.c.

Referenced by decode_mb_b().