screenpresso.c File Reference

Screenpresso decoder. More...

#include <stdint.h>
#include <zlib.h>
#include "libavutil/imgutils.h"
#include "libavutil/internal.h"
#include "libavutil/mem.h"
#include "avcodec.h"
#include "codec_internal.h"
#include "decode.h"

Go to the source code of this file.

Data Structures
struct	ScreenpressoContext

Functions
static av_cold int	screenpresso_close (AVCodecContext *avctx)
static av_cold int	screenpresso_init (AVCodecContext *avctx)
static void	sum_delta_flipped (uint8_t *dst, int dst_linesize, const uint8_t *src, int src_linesize, int bytewidth, int height)
static int	screenpresso_decode_frame (AVCodecContext *avctx, AVFrame *frame, int *got_frame, AVPacket *avpkt)

Variables
const FFCodec	ff_screenpresso_decoder

Detailed Description

Screenpresso decoder.

Fourcc: SPV1

Screenpresso simply horizontally flips and then deflates frames, alternating full pictures and deltas. Deltas are related to the currently rebuilt frame (not the reference), and since there is no coordinate system they contain exactly as many pixel as the keyframe.

Supports: BGR0, BGR24, RGB555

Definition in file screenpresso.c.

Function Documentation

screenpresso_close()

static av_cold int screenpresso_close ( AVCodecContext * avctx )

static

Definition at line 55 of file screenpresso.c.

screenpresso_init()

static av_cold int screenpresso_init ( AVCodecContext * avctx )

static

Definition at line 65 of file screenpresso.c.

sum_delta_flipped()

static void sum_delta_flipped ( uint8_t * dst, int dst_linesize, const uint8_t * src, int src_linesize, int bytewidth, int height )

static

Definition at line 91 of file screenpresso.c.

Referenced by screenpresso_decode_frame().

screenpresso_decode_frame()

static int screenpresso_decode_frame ( AVCodecContext * avctx, AVFrame * frame, int * got_frame, AVPacket * avpkt )

static

Definition at line 104 of file screenpresso.c.

Variable Documentation

ff_screenpresso_decoder

const FFCodec ff_screenpresso_decoder

Initial value:

= {
    .p.name         = "screenpresso",
    CODEC_LONG_NAME("Screenpresso"),
    .p.type         = AVMEDIA_TYPE_VIDEO,
    .p.id           = AV_CODEC_ID_SCREENPRESSO,
    .init           = screenpresso_init,
    FF_CODEC_DECODE_CB(screenpresso_decode_frame),
    .close          = screenpresso_close,
    .priv_data_size = sizeof(ScreenpressoContext),
    .p.capabilities = AV_CODEC_CAP_DR1,
    .caps_internal  = FF_CODEC_CAP_INIT_CLEANUP,
}

Definition at line 190 of file screenpresso.c.