flashsv2enc.c File Reference

Flash Screen Video Version 2 encoder. More...

#include <stdio.h>
#include <stdlib.h>
#include <zlib.h>
#include "libavutil/imgutils.h"
#include "avcodec.h"
#include "internal.h"
#include "put_bits.h"
#include "bytestream.h"

Go to the source code of this file.

Data Structures
struct	Block
struct	Palette
struct	FlashSV2Context

Macros
#define	HAS_IFRAME_IMAGE   0x02
#define	HAS_PALLET_INFO   0x01
#define	COLORSPACE_BGR   0x00
#define	COLORSPACE_15_7   0x10
#define	HAS_DIFF_BLOCKS   0x04
#define	ZLIB_PRIME_COMPRESS_CURRENT   0x02
#define	ZLIB_PRIME_COMPRESS_PREVIOUS   0x01
#define	FLASHSV2_DUMB

Functions
static av_cold void	cleanup (FlashSV2Context *s)
static void	init_blocks (FlashSV2Context *s, Block *blocks, uint8_t *encbuf, uint8_t *databuf)
static void	reset_stats (FlashSV2Context *s)
static av_cold int	flashsv2_encode_init (AVCodecContext *avctx)
static int	new_key_frame (FlashSV2Context *s)
static int	write_palette (FlashSV2Context *s, uint8_t *buf, int buf_size)
static int	write_header (FlashSV2Context *s, uint8_t *buf, int buf_size)
static int	write_block (Block *b, uint8_t *buf, int buf_size)
static int	encode_zlib (Block *b, uint8_t *buf, unsigned long *buf_size, int comp)
static int	encode_zlibprime (Block *b, Block *prime, uint8_t *buf, int *buf_size, int comp)
static int	encode_bgr (Block *b, const uint8_t *src, int stride)
static unsigned	pixel_color15 (const uint8_t *src)
static unsigned int	chroma_diff (unsigned int c1, unsigned int c2)
static int	pixel_color7_fast (Palette *palette, unsigned c15)
static int	pixel_color7_slow (Palette *palette, unsigned color)
static unsigned	pixel_bgr (const uint8_t *src)
static int	write_pixel_15_7 (Palette *palette, uint8_t *dest, const uint8_t *src, int dist)
static int	update_palette_index (Palette *palette)
static int	generate_default_palette (Palette *palette)
static int	generate_optimum_palette (Palette *palette, const uint8_t *image, int width, int height, int stride)
static int	encode_15_7_sl (Palette *palette, uint8_t *dest, const uint8_t *src, int width, int dist)
static int	encode_15_7 (Palette *palette, Block *b, const uint8_t *src, int stride, int dist)
static int	encode_block (FlashSV2Context *s, Palette *palette, Block *b, Block *prev, const uint8_t *src, int stride, int comp, int dist, int keyframe)
static int	compare_sl (FlashSV2Context *s, Block *b, const uint8_t *src, uint8_t *frame, uint8_t *key, int y, int keyframe)
static int	mark_all_blocks (FlashSV2Context *s, const uint8_t *src, int stride, int keyframe)
static int	encode_all_blocks (FlashSV2Context *s, int keyframe)
static int	write_all_blocks (FlashSV2Context *s, uint8_t *buf, int buf_size)
static int	write_bitstream (FlashSV2Context *s, const uint8_t *src, int stride, uint8_t *buf, int buf_size, int keyframe)
static void	recommend_keyframe (FlashSV2Context *s, int *keyframe)
static int	optimum_block_width (FlashSV2Context *s)
static int	optimum_block_height (FlashSV2Context *s)
static int	optimum_use15_7 (FlashSV2Context *s)
static int	optimum_dist (FlashSV2Context *s)
static int	reconfigure_at_keyframe (FlashSV2Context *s, const uint8_t *image, int stride)
static int	flashsv2_encode_frame (AVCodecContext *avctx, AVPacket *pkt, const AVFrame *p, int *got_packet)
static av_cold int	flashsv2_encode_end (AVCodecContext *avctx)

Variables
static const unsigned int	default_screen_video_v2_palette [128]
static const double	block_size_fraction = 1.0 / 300
static const double	use15_7_threshold = 8192
static const double	color15_7_factor = 100
AVCodec	ff_flashsv2_encoder

Detailed Description

Flash Screen Video Version 2 encoder.

Author

Joshua Warner

Definition in file flashsv2enc.c.

Macro Definition Documentation

#define HAS_IFRAME_IMAGE   0x02

Definition at line 55 of file flashsv2enc.c.

#define HAS_PALLET_INFO   0x01

Definition at line 56 of file flashsv2enc.c.

Referenced by write_header().

#define COLORSPACE_BGR   0x00

Definition at line 58 of file flashsv2enc.c.

#define COLORSPACE_15_7   0x10

Definition at line 59 of file flashsv2enc.c.

Referenced by encode_all_blocks(), and encode_block().

#define HAS_DIFF_BLOCKS   0x04

Definition at line 60 of file flashsv2enc.c.

Referenced by encode_all_blocks(), and write_block().

#define ZLIB_PRIME_COMPRESS_CURRENT   0x02

Definition at line 61 of file flashsv2enc.c.

Referenced by write_block().

#define ZLIB_PRIME_COMPRESS_PREVIOUS   0x01

Definition at line 62 of file flashsv2enc.c.

Referenced by encode_block().

#define FLASHSV2_DUMB

Definition at line 66 of file flashsv2enc.c.

Function Documentation

static av_cold void cleanup ( FlashSV2Context *  s )

static

Definition at line 127 of file flashsv2enc.c.

Referenced by flashsv2_encode_end(), flashsv2_encode_init(), and open_input().

static void init_blocks ( FlashSV2Context *  s, Block *  blocks, uint8_t *  encbuf, uint8_t *  databuf  )

static

Definition at line 140 of file flashsv2enc.c.

Referenced by flashsv2_encode_init(), and reconfigure_at_keyframe().

static void reset_stats ( FlashSV2Context *  s )

static

Definition at line 166 of file flashsv2enc.c.

Referenced by flashsv2_encode_init(), and reconfigure_at_keyframe().

static av_cold int flashsv2_encode_init ( AVCodecContext *  avctx )

static

Definition at line 177 of file flashsv2enc.c.

static int new_key_frame ( FlashSV2Context *  s )

static

Definition at line 259 of file flashsv2enc.c.

Referenced by flashsv2_encode_frame().

static int write_palette ( FlashSV2Context *  s, uint8_t *  buf, int  buf_size  )

static

Definition at line 276 of file flashsv2enc.c.

Referenced by write_header().

static int write_header ( FlashSV2Context *  s, uint8_t *  buf, int  buf_size  )

static

Definition at line 282 of file flashsv2enc.c.

Referenced by write_bitstream().

static int write_block ( Block *  b, uint8_t *  buf, int  buf_size  )

static

Definition at line 312 of file flashsv2enc.c.

Referenced by write_all_blocks().

static int encode_zlib ( Block *  b, uint8_t *  buf, unsigned long *  buf_size, int  comp  )

static

Definition at line 352 of file flashsv2enc.c.

Referenced by encode_block().

static int encode_zlibprime ( Block *  b, Block *  prime, uint8_t *  buf, int *  buf_size, int  comp  )

static

Definition at line 358 of file flashsv2enc.c.

Referenced by encode_block().

static int encode_bgr ( Block *  b, const uint8_t *  src, int  stride  )

static

Definition at line 392 of file flashsv2enc.c.

Referenced by encode_block().

static unsigned pixel_color15 ( const uint8_t *  src )

inlinestatic

Definition at line 408 of file flashsv2enc.c.

Referenced by write_pixel_15_7().

static unsigned int chroma_diff ( unsigned int  c1, unsigned int  c2  )

inlinestatic

Definition at line 413 of file flashsv2enc.c.

Referenced by pixel_color7_slow(), and write_pixel_15_7().

static int pixel_color7_fast ( Palette *  palette, unsigned  c15  )

inlinestatic

Definition at line 423 of file flashsv2enc.c.

Referenced by write_pixel_15_7().

static int pixel_color7_slow ( Palette *  palette, unsigned  color  )

static

Definition at line 428 of file flashsv2enc.c.

Referenced by update_palette_index().

static unsigned pixel_bgr ( const uint8_t *  src )

inlinestatic

Definition at line 443 of file flashsv2enc.c.

Referenced by write_pixel_15_7().

static int write_pixel_15_7 ( Palette *  palette, uint8_t *  dest, const uint8_t *  src, int  dist  )

static

Definition at line 448 of file flashsv2enc.c.

Referenced by encode_15_7_sl().

static int update_palette_index ( Palette *  palette )

static

Definition at line 466 of file flashsv2enc.c.

Referenced by generate_default_palette().

static int generate_default_palette ( Palette *  palette )

static

Definition at line 509 of file flashsv2enc.c.

Referenced by reconfigure_at_keyframe().

static int generate_optimum_palette ( Palette *  palette, const uint8_t *  image, int  width, int  height, int  stride  )

static

Definition at line 517 of file flashsv2enc.c.

Referenced by reconfigure_at_keyframe().

static int encode_15_7_sl ( Palette *  palette, uint8_t *  dest, const uint8_t *  src, int  width, int  dist  )

inlinestatic

Definition at line 524 of file flashsv2enc.c.

Referenced by encode_15_7().

static int encode_15_7 ( Palette *  palette, Block *  b, const uint8_t *  src, int  stride, int  dist  )

static

Definition at line 534 of file flashsv2enc.c.

Referenced by encode_block().

static int encode_block ( FlashSV2Context *  s, Palette *  palette, Block *  b, Block *  prev, const uint8_t *  src, int  stride, int  comp, int  dist, int  keyframe  )

static

Definition at line 551 of file flashsv2enc.c.

Referenced by encode_all_blocks().

static int compare_sl ( FlashSV2Context *  s, Block *  b, const uint8_t *  src, uint8_t *  frame, uint8_t *  key, int  y, int  keyframe  )

static

Definition at line 588 of file flashsv2enc.c.

Referenced by mark_all_blocks().

static int mark_all_blocks ( FlashSV2Context *  s, const uint8_t *  src, int  stride, int  keyframe  )

static

Definition at line 606 of file flashsv2enc.c.

Referenced by write_bitstream().

static int encode_all_blocks ( FlashSV2Context *  s, int  keyframe  )

static

Definition at line 627 of file flashsv2enc.c.

Referenced by write_bitstream().

static int write_all_blocks ( FlashSV2Context *  s, uint8_t *  buf, int  buf_size  )

static

Definition at line 667 of file flashsv2enc.c.

Referenced by write_bitstream().

static int write_bitstream ( FlashSV2Context *  s, const uint8_t *  src, int  stride, uint8_t *  buf, int  buf_size, int  keyframe  )

static

Definition at line 685 of file flashsv2enc.c.

Referenced by flashsv2_encode_frame().

static void recommend_keyframe ( FlashSV2Context *  s, int *  keyframe  )

static

Definition at line 714 of file flashsv2enc.c.

Referenced by flashsv2_encode_frame().

static int optimum_block_width ( FlashSV2Context *  s )

static

Definition at line 736 of file flashsv2enc.c.

Referenced by reconfigure_at_keyframe().

static int optimum_block_height ( FlashSV2Context *  s )

static

Definition at line 748 of file flashsv2enc.c.

Referenced by reconfigure_at_keyframe().

static int optimum_use15_7 ( FlashSV2Context *  s )

static

Definition at line 762 of file flashsv2enc.c.

Referenced by reconfigure_at_keyframe().

static int optimum_dist ( FlashSV2Context *  s )

static

Definition at line 779 of file flashsv2enc.c.

Referenced by flashsv2_encode_frame().

static int reconfigure_at_keyframe ( FlashSV2Context *  s, const uint8_t *  image, int  stride  )

static

Definition at line 794 of file flashsv2enc.c.

Referenced by flashsv2_encode_frame().

static int flashsv2_encode_frame ( AVCodecContext *  avctx, AVPacket *  pkt, const AVFrame *  p, int *  got_packet  )

static

Definition at line 850 of file flashsv2enc.c.

static av_cold int flashsv2_encode_end ( AVCodecContext *  avctx )

static

Definition at line 901 of file flashsv2enc.c.

Variable Documentation

const unsigned int default_screen_video_v2_palette[128]

static

Initial value:

= {
    0x00000000, 0x00333333, 0x00666666, 0x00999999, 0x00CCCCCC, 0x00FFFFFF,
    0x00330000, 0x00660000, 0x00990000, 0x00CC0000, 0x00FF0000, 0x00003300,
    0x00006600, 0x00009900, 0x0000CC00, 0x0000FF00, 0x00000033, 0x00000066,
    0x00000099, 0x000000CC, 0x000000FF, 0x00333300, 0x00666600, 0x00999900,
    0x00CCCC00, 0x00FFFF00, 0x00003333, 0x00006666, 0x00009999, 0x0000CCCC,
    0x0000FFFF, 0x00330033, 0x00660066, 0x00990099, 0x00CC00CC, 0x00FF00FF,
    0x00FFFF33, 0x00FFFF66, 0x00FFFF99, 0x00FFFFCC, 0x00FF33FF, 0x00FF66FF,
    0x00FF99FF, 0x00FFCCFF, 0x0033FFFF, 0x0066FFFF, 0x0099FFFF, 0x00CCFFFF,
    0x00CCCC33, 0x00CCCC66, 0x00CCCC99, 0x00CCCCFF, 0x00CC33CC, 0x00CC66CC,
    0x00CC99CC, 0x00CCFFCC, 0x0033CCCC, 0x0066CCCC, 0x0099CCCC, 0x00FFCCCC,
    0x00999933, 0x00999966, 0x009999CC, 0x009999FF, 0x00993399, 0x00996699,
    0x0099CC99, 0x0099FF99, 0x00339999, 0x00669999, 0x00CC9999, 0x00FF9999,
    0x00666633, 0x00666699, 0x006666CC, 0x006666FF, 0x00663366, 0x00669966,
    0x0066CC66, 0x0066FF66, 0x00336666, 0x00996666, 0x00CC6666, 0x00FF6666,
    0x00333366, 0x00333399, 0x003333CC, 0x003333FF, 0x00336633, 0x00339933,
    0x0033CC33, 0x0033FF33, 0x00663333, 0x00993333, 0x00CC3333, 0x00FF3333,
    0x00003366, 0x00336600, 0x00660033, 0x00006633, 0x00330066, 0x00663300,
    0x00336699, 0x00669933, 0x00993366, 0x00339966, 0x00663399, 0x00996633,
    0x006699CC, 0x0099CC66, 0x00CC6699, 0x0066CC99, 0x009966CC, 0x00CC9966,
    0x0099CCFF, 0x00CCFF99, 0x00FF99CC, 0x0099FFCC, 0x00CC99FF, 0x00FFCC99,
    0x00111111, 0x00222222, 0x00444444, 0x00555555, 0x00AAAAAA, 0x00BBBBBB,
    0x00DDDDDD, 0x00EEEEEE
}

Definition at line 484 of file flashsv2enc.c.

Referenced by generate_default_palette().

const double block_size_fraction = 1.0 / 300

static

Definition at line 735 of file flashsv2enc.c.

Referenced by optimum_block_height(), and optimum_block_width().

const double use15_7_threshold = 8192

static

Definition at line 760 of file flashsv2enc.c.

const double color15_7_factor = 100

static

Definition at line 777 of file flashsv2enc.c.

Referenced by optimum_dist().

AVCodec ff_flashsv2_encoder

Initial value:

= {
    .name           = "flashsv2",
    .long_name      = NULL_IF_CONFIG_SMALL("Flash Screen Video Version 2"),
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_FLASHSV2,
    .priv_data_size = sizeof(FlashSV2Context),
    .init           = flashsv2_encode_init,
    .encode2        = flashsv2_encode_frame,
    .close          = flashsv2_encode_end,
    .pix_fmts       = (const enum AVPixelFormat[]){ AV_PIX_FMT_BGR24, AV_PIX_FMT_NONE },
}

Definition at line 910 of file flashsv2enc.c.