On2 VP3 Video Decoder. More...

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "libavutil/imgutils.h"
#include "avcodec.h"
#include "internal.h"
#include "dsputil.h"
#include "get_bits.h"
#include "vp3data.h"
#include "xiph.h"
#include "thread.h"

Data Structures
struct	Vp3Fragment
struct	Vp3DecodeContext
Defines
#define	FRAGMENT_PIXELS 8
#define	SB_NOT_CODED 0
#define	SB_PARTIALLY_CODED 1
#define	SB_FULLY_CODED 2
#define	MAXIMUM_LONG_BIT_RUN 4129
#define	MODE_INTER_NO_MV 0
#define	MODE_INTRA 1
#define	MODE_INTER_PLUS_MV 2
#define	MODE_INTER_LAST_MV 3
#define	MODE_INTER_PRIOR_LAST 4
#define	MODE_USING_GOLDEN 5
#define	MODE_GOLDEN_MV 6
#define	MODE_INTER_FOURMV 7
#define	CODING_MODE_COUNT 8
#define	MODE_COPY 8
#define	MIN_DEQUANT_VAL 2
#define	TOKEN_EOB(eob_run) ((eob_run) << 2)
#define	TOKEN_ZERO_RUN(coeff, zero_run) (((coeff) << 9) + ((zero_run) << 2) + 1)
#define	TOKEN_COEFF(coeff) (((coeff) << 2) + 2)
#define	BLOCK_X (2*mb_x + (k&1))
#define	BLOCK_Y (2*mb_y + (k>>1))
#define	SET_CHROMA_MODES
#define	COMPATIBLE_FRAME(x) (compatible_frame[s->all_fragments[x].coding_method] == current_frame_type)
#define	DC_COEFF(u) s->all_fragments[u].dc
#define	PUL 8
#define	PU 4
#define	PUR 2
#define	PL 1
#define	copy_fields(to, from, start_field, end_field) memcpy(&to->start_field, &from->start_field, (char)&to->end_field - (char)&to->start_field)
Typedefs
typedef struct Vp3Fragment	Vp3Fragment
typedef struct Vp3DecodeContext	Vp3DecodeContext
Functions
static void	vp3_decode_flush (AVCodecContext *avctx)
static av_cold int	vp3_decode_end (AVCodecContext *avctx)
static int	init_block_mapping (Vp3DecodeContext *s)
static void	init_dequantizer (Vp3DecodeContext *s, int qpi)
static void	init_loop_filter (Vp3DecodeContext *s)
static int	unpack_superblocks (Vp3DecodeContext s, GetBitContext gb)
static int	unpack_modes (Vp3DecodeContext s, GetBitContext gb)
static int	unpack_vectors (Vp3DecodeContext s, GetBitContext gb)
static int	unpack_block_qpis (Vp3DecodeContext s, GetBitContext gb)
static int	unpack_vlcs (Vp3DecodeContext s, GetBitContext gb, VLC *table, int coeff_index, int plane, int eob_run)
static void	reverse_dc_prediction (Vp3DecodeContext *s, int first_fragment, int fragment_width, int fragment_height)
static int	unpack_dct_coeffs (Vp3DecodeContext s, GetBitContext gb)
static void	apply_loop_filter (Vp3DecodeContext *s, int plane, int ystart, int yend)
static int	vp3_dequant (Vp3DecodeContext s, Vp3Fragment frag, int plane, int inter, DCTELEM block[64])
	Pull DCT tokens from the 64 levels to decode and dequant the coefficients for the next block in coding order.
static void	vp3_draw_horiz_band (Vp3DecodeContext *s, int y)
	called when all pixels up to row y are complete
static void	await_reference_row (Vp3DecodeContext s, Vp3Fragment fragment, int motion_y, int y)
	Wait for the reference frame of the current fragment.
static void	render_slice (Vp3DecodeContext *s, int slice)
static av_cold int	allocate_tables (AVCodecContext *avctx)
	Allocate tables for per-frame data in Vp3DecodeContext.
static av_cold int	vp3_decode_init (AVCodecContext *avctx)
static void	update_frames (AVCodecContext *avctx)
	Release and shuffle frames after decode finishes.
static int	vp3_update_thread_context (AVCodecContext dst, const AVCodecContext src)
static int	vp3_decode_frame (AVCodecContext avctx, void data, int data_size, AVPacket avpkt)
static int	read_huffman_tree (AVCodecContext avctx, GetBitContext gb)
static int	vp3_init_thread_copy (AVCodecContext *avctx)
static int	theora_decode_header (AVCodecContext avctx, GetBitContext gb)
static int	theora_decode_tables (AVCodecContext avctx, GetBitContext gb)
static av_cold int	theora_decode_init (AVCodecContext *avctx)
Variables
static const int	ModeAlphabet [6][CODING_MODE_COUNT]
static const uint8_t	hilbert_offset [16][2]
static enum PixelFormat	theora_pix_fmts [4]
AVCodec	ff_theora_decoder
AVCodec	ff_vp3_decoder

Detailed Description

On2 VP3 Video Decoder.

VP3 Video Decoder by Mike Melanson (mike at multimedia.cx) For more information about the VP3 coding process, visit: http://wiki.multimedia.cx/index.php?title=On2_VP3

Theora decoder by Alex Beregszaszi

Definition in file vp3.c.

Define Documentation

#define BLOCK_X (2*mb_x + (k&1))

#define BLOCK_Y (2*mb_y + (k>>1))

Referenced by unpack_modes(), and unpack_vectors().

#define CODING_MODE_COUNT 8

Definition at line 72 of file vp3.c.

#define COMPATIBLE_FRAME ( x ) (compatible_frame[s->all_fragments[x].coding_method] == current_frame_type)

Definition at line 1126 of file vp3.c.

Referenced by reverse_dc_prediction().

#define copy_fields	(	to,
		from,
		start_field,
		end_field
	)		memcpy(&to->start_field, &from->start_field, (char)&to->end_field - (char)&to->start_field)

#define DC_COEFF ( u ) s->all_fragments[u].dc

Definition at line 1128 of file vp3.c.

Referenced by reverse_dc_prediction().

#define FRAGMENT_PIXELS 8

Definition at line 46 of file vp3.c.

#define MAXIMUM_LONG_BIT_RUN 4129

Definition at line 62 of file vp3.c.

Referenced by unpack_block_qpis(), and unpack_superblocks().

#define MIN_DEQUANT_VAL 2

Definition at line 125 of file vp3.c.

#define MODE_COPY 8

Definition at line 75 of file vp3.c.

Referenced by apply_loop_filter(), render_slice(), reverse_dc_prediction(), unpack_modes(), unpack_superblocks(), and unpack_vectors().

#define MODE_GOLDEN_MV 6

Definition at line 70 of file vp3.c.

Referenced by await_reference_row(), render_slice(), and unpack_vectors().

#define MODE_INTER_FOURMV 7

Definition at line 71 of file vp3.c.

Referenced by unpack_vectors().

#define MODE_INTER_LAST_MV 3

Definition at line 67 of file vp3.c.

Referenced by unpack_vectors().

#define MODE_INTER_NO_MV 0

Definition at line 64 of file vp3.c.

Referenced by unpack_modes().

#define MODE_INTER_PLUS_MV 2

Definition at line 66 of file vp3.c.

Referenced by unpack_vectors().

#define MODE_INTER_PRIOR_LAST 4

Definition at line 68 of file vp3.c.

Referenced by unpack_vectors().

#define MODE_INTRA 1

Definition at line 65 of file vp3.c.

Referenced by render_slice(), and unpack_modes().

#define MODE_USING_GOLDEN 5

Definition at line 69 of file vp3.c.

Referenced by await_reference_row(), and render_slice().

#define PL 1

#define PU 4

#define PUL 8

#define PUR 2

#define SB_FULLY_CODED 2

Definition at line 57 of file vp3.c.

Referenced by unpack_superblocks().

#define SB_NOT_CODED 0

Definition at line 55 of file vp3.c.

Referenced by unpack_superblocks().

#define SB_PARTIALLY_CODED 1

Definition at line 56 of file vp3.c.

Referenced by unpack_superblocks().

#define SET_CHROMA_MODES

Value:

if (frag[s->fragment_start[1]].coding_method != MODE_COPY) \
        frag[s->fragment_start[1]].coding_method = coding_mode;\
    if (frag[s->fragment_start[2]].coding_method != MODE_COPY) \
        frag[s->fragment_start[2]].coding_method = coding_mode;

Referenced by unpack_modes().

#define TOKEN_COEFF ( coeff ) (((coeff) << 2) + 2)

Definition at line 202 of file vp3.c.

Referenced by unpack_vlcs().

#define TOKEN_EOB ( eob_run ) ((eob_run) << 2)

Definition at line 200 of file vp3.c.

Referenced by unpack_vlcs().

#define TOKEN_ZERO_RUN	(	coeff,
		zero_run
	)		(((coeff) << 9) + ((zero_run) << 2) + 1)

Definition at line 201 of file vp3.c.

Referenced by unpack_vlcs().

Typedef Documentation

typedef struct Vp3DecodeContext Vp3DecodeContext

typedef struct Vp3Fragment Vp3Fragment

Function Documentation

static av_cold int allocate_tables ( AVCodecContext * avctx ) [static]

Allocate tables for per-frame data in Vp3DecodeContext.

Definition at line 1628 of file vp3.c.

Referenced by vp3_decode_init(), and vp3_update_thread_context().

static void apply_loop_filter	(	Vp3DecodeContext *	s,
		int	plane,
		int	ystart,
		int	yend
	)			`[static]`

Definition at line 1280 of file vp3.c.

Referenced by render_slice().

static void await_reference_row	(	Vp3DecodeContext *	s,
		Vp3Fragment *	fragment,
		int	motion_y,
		int	y
	)			`[static]`

Wait for the reference frame of the current fragment.

The progress value is in luma pixel rows.

Definition at line 1432 of file vp3.c.

Referenced by render_slice().

static int init_block_mapping ( Vp3DecodeContext * s ) [static]

Definition at line 320 of file vp3.c.

Referenced by allocate_tables().

static void init_dequantizer	(	Vp3DecodeContext *	s,
		int	qpi
	)			`[static]`

Definition at line 351 of file vp3.c.

static void init_loop_filter ( Vp3DecodeContext * s ) [static]

Definition at line 391 of file vp3.c.

static int read_huffman_tree	(	AVCodecContext *	avctx,
		GetBitContext *	gb
	)			`[static]`

Definition at line 2064 of file vp3.c.

Referenced by theora_decode_tables().

static void render_slice	(	Vp3DecodeContext *	s,
		int	slice
	)			`[static]`

Definition at line 1454 of file vp3.c.

static void reverse_dc_prediction	(	Vp3DecodeContext *	s,
		int	first_fragment,
		int	fragment_width,
		int	fragment_height
	)			`[static]`

Definition at line 1130 of file vp3.c.

Referenced by unpack_dct_coeffs().

static int theora_decode_header	(	AVCodecContext *	avctx,
		GetBitContext *	gb
	)			`[static]`

Definition at line 2120 of file vp3.c.

Referenced by theora_decode_init().

static av_cold int theora_decode_init ( AVCodecContext * avctx ) [static]

Definition at line 2313 of file vp3.c.

static int theora_decode_tables	(	AVCodecContext *	avctx,
		GetBitContext *	gb
	)			`[static]`

Definition at line 2206 of file vp3.c.

Referenced by theora_decode_init().

static int unpack_block_qpis	(	Vp3DecodeContext *	s,
		GetBitContext *	gb
	)			`[static]`

Definition at line 856 of file vp3.c.

static int unpack_dct_coeffs	(	Vp3DecodeContext *	s,
		GetBitContext *	gb
	)			`[static]`

Definition at line 1034 of file vp3.c.

static int unpack_modes	(	Vp3DecodeContext *	s,
		GetBitContext *	gb
	)			`[static]`

Definition at line 573 of file vp3.c.

static int unpack_superblocks	(	Vp3DecodeContext *	s,
		GetBitContext *	gb
	)			`[static]`

Definition at line 419 of file vp3.c.

static int unpack_vectors	(	Vp3DecodeContext *	s,
		GetBitContext *	gb
	)			`[static]`

Definition at line 679 of file vp3.c.

static int unpack_vlcs	(	Vp3DecodeContext *	s,
		GetBitContext *	gb,
		VLC *	table,
		int	coeff_index,
		int	plane,
		int	eob_run
	)			`[static]`

Definition at line 910 of file vp3.c.

Referenced by unpack_dct_coeffs().

static void update_frames ( AVCodecContext * avctx ) [static]

Release and shuffle frames after decode finishes.

Definition at line 1835 of file vp3.c.

Referenced by vp3_update_thread_context().

static av_cold int vp3_decode_end ( AVCodecContext * avctx ) [static]

Definition at line 276 of file vp3.c.

Referenced by allocate_tables().

static void vp3_decode_flush ( AVCodecContext * avctx ) [static]

Definition at line 256 of file vp3.c.

Referenced by vp3_decode_end().

static int vp3_decode_frame	(	AVCodecContext *	avctx,
		void *	data,
		int *	data_size,
		AVPacket *	avpkt
	)			`[static]`

Definition at line 1910 of file vp3.c.

static av_cold int vp3_decode_init ( AVCodecContext * avctx ) [static]

Definition at line 1659 of file vp3.c.

Referenced by theora_decode_init().

static int vp3_dequant	(	Vp3DecodeContext *	s,
		Vp3Fragment *	frag,
		int	plane,
		int	inter,
		DCTELEM	block[64]
	)			`[inline, static]`

Pull DCT tokens from the 64 levels to decode and dequant the coefficients for the next block in coding order.

Definition at line 1347 of file vp3.c.

Referenced by render_slice().

static void vp3_draw_horiz_band	(	Vp3DecodeContext *	s,
		int	y
	)			`[static]`

called when all pixels up to row y are complete

Definition at line 1392 of file vp3.c.

Referenced by render_slice().

static int vp3_init_thread_copy ( AVCodecContext * avctx ) [static]

Definition at line 2098 of file vp3.c.

static int vp3_update_thread_context	(	AVCodecContext *	dst,
		const AVCodecContext *	src
	)			`[static]`

Definition at line 1857 of file vp3.c.

Variable Documentation

AVCodec ff_theora_decoder

Initial value:

 {
    .name           = "theora",
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = CODEC_ID_THEORA,
    .priv_data_size = sizeof(Vp3DecodeContext),
    .init           = theora_decode_init,
    .close          = vp3_decode_end,
    .decode         = vp3_decode_frame,
    .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_FRAME_THREADS,
    .flush = vp3_decode_flush,
    .long_name = NULL_IF_CONFIG_SMALL("Theora"),
    .init_thread_copy      = ONLY_IF_THREADS_ENABLED(vp3_init_thread_copy),
    .update_thread_context = ONLY_IF_THREADS_ENABLED(vp3_update_thread_context)
}

Definition at line 2376 of file vp3.c.

AVCodec ff_vp3_decoder

Initial value:

 {
    .name           = "vp3",
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = CODEC_ID_VP3,
    .priv_data_size = sizeof(Vp3DecodeContext),
    .init           = vp3_decode_init,
    .close          = vp3_decode_end,
    .decode         = vp3_decode_frame,
    .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_FRAME_THREADS,
    .flush = vp3_decode_flush,
    .long_name = NULL_IF_CONFIG_SMALL("On2 VP3"),
    .init_thread_copy      = ONLY_IF_THREADS_ENABLED(vp3_init_thread_copy),
    .update_thread_context = ONLY_IF_THREADS_ENABLED(vp3_update_thread_context)
}

Definition at line 2392 of file vp3.c.

const uint8_t hilbert_offset[16][2] [static]

Initial value:

 {
    {0,0}, {1,0}, {1,1}, {0,1},
    {0,2}, {0,3}, {1,3}, {1,2},
    {2,2}, {2,3}, {3,3}, {3,2},
    {3,1}, {2,1}, {2,0}, {3,0}
}

Definition at line 118 of file vp3.c.

Referenced by init_block_mapping(), and render_slice().

const int ModeAlphabet[6][CODING_MODE_COUNT] [static]

Definition at line 78 of file vp3.c.

Referenced by unpack_modes().

enum PixelFormat theora_pix_fmts[4] [static]

Initial value:

 {
    PIX_FMT_YUV420P, PIX_FMT_NONE, PIX_FMT_YUV422P, PIX_FMT_YUV444P
}

Definition at line 2116 of file vp3.c.

libavcodec/vp3.c File Reference

Data Structures

Defines

Typedefs

Functions

Variables

Detailed Description

Define Documentation

Typedef Documentation

Function Documentation

Variable Documentation