pngdec.c File Reference
#include "libavutil/imgutils.h"
#include "avcodec.h"
#include "bytestream.h"
#include "internal.h"
#include "png.h"
#include "pngdsp.h"
#include <zlib.h>

Go to the source code of this file.

Data Structures

struct  PNGDecContext
 

Macros

#define UNROLL1(bpp, op)
 
#define UNROLL_FILTER(op)
 
#define OP_SUB(x, s, l)   x+s
 
#define OP_AVG(x, s, l)   (((x + l) >> 1) + s) & 0xff
 

Typedefs

typedef struct PNGDecContext PNGDecContext
 

Functions

static void png_put_interlaced_row (uint8_t *dst, int width, int bits_per_pixel, int pass, int color_type, const uint8_t *src)
 
void ff_add_png_paeth_prediction (uint8_t *dst, uint8_t *src, uint8_t *top, int w, int bpp)
 
static void png_filter_row (PNGDSPContext *dsp, uint8_t *dst, int filter_type, uint8_t *src, uint8_t *last, int size, int bpp)
 
static av_always_inline void convert_to_rgb32_loco (uint8_t *dst, const uint8_t *src, int width, int loco)
 
static void convert_to_rgb32 (uint8_t *dst, const uint8_t *src, int width, int loco)
 
static void deloco_rgb24 (uint8_t *dst, int size)
 
static void png_handle_row (PNGDecContext *s)
 
static int png_decode_idat (PNGDecContext *s, int length)
 
static int decode_frame (AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
 
static av_cold int png_dec_init (AVCodecContext *avctx)
 
static av_cold int png_dec_end (AVCodecContext *avctx)
 

Variables

static const uint8_t png_pass_dsp_ymask [NB_PASSES]
 
static const uint8_t png_pass_dsp_mask [NB_PASSES]
 
AVCodec ff_png_decoder
 

Macro Definition Documentation

#define OP_AVG (   x,
  s,
 
)    (((x + l) >> 1) + s) & 0xff

Referenced by DEF(), and png_filter_row().

#define OP_SUB (   x,
  s,
 
)    x+s

Referenced by png_filter_row().

#define UNROLL1 (   bpp,
  op 
)
Value:
{\
r = dst[0];\
if(bpp >= 2) g = dst[1];\
if(bpp >= 3) b = dst[2];\
if(bpp >= 4) a = dst[3];\
for(; i < size; i+=bpp) {\
dst[i+0] = r = op(r, src[i+0], last[i+0]);\
if(bpp == 1) continue;\
dst[i+1] = g = op(g, src[i+1], last[i+1]);\
if(bpp == 2) continue;\
dst[i+2] = b = op(b, src[i+2], last[i+2]);\
if(bpp == 3) continue;\
dst[i+3] = a = op(a, src[i+3], last[i+3]);\
}\
}
int size
#define b
Definition: input.c:52
#define r
Definition: input.c:51
g
Definition: yuv2rgb.c:540
static int op(uint8_t **dst, const uint8_t *dst_end, GetByteContext *gb, int pixel, int count, int *x, int width, int linesize)
Perform decode operation.
Definition: anm.c:72
for(j=16;j >0;--j)
if(!(ptr_align%ac->ptr_align)&&samples_align >=aligned_len)

Definition at line 163 of file pngdec.c.

#define UNROLL_FILTER (   op)
Value:
if(bpp == 1) UNROLL1(1, op)\
else if(bpp == 2) UNROLL1(2, op)\
else if(bpp == 3) UNROLL1(3, op)\
else if(bpp == 4) UNROLL1(4, op)\
for (; i < size; i += bpp) {\
int j;\
for (j = 0; j < bpp; j++)\
dst[i+j] = op(dst[i+j-bpp], src[i+j], last[i+j]);\
}\
}
int size
static int op(uint8_t **dst, const uint8_t *dst_end, GetByteContext *gb, int pixel, int count, int *x, int width, int linesize)
Perform decode operation.
Definition: anm.c:72
#define UNROLL1(bpp, op)
Definition: pngdec.c:163
for(j=16;j >0;--j)

Definition at line 179 of file pngdec.c.

Referenced by png_filter_row().

Typedef Documentation

typedef struct PNGDecContext PNGDecContext

Function Documentation

static void convert_to_rgb32 ( uint8_t dst,
const uint8_t src,
int  width,
int  loco 
)
static

Definition at line 265 of file pngdec.c.

Referenced by png_handle_row().

static av_always_inline void convert_to_rgb32_loco ( uint8_t dst,
const uint8_t src,
int  width,
int  loco 
)
static

Definition at line 245 of file pngdec.c.

Referenced by convert_to_rgb32().

static int decode_frame ( AVCodecContext avctx,
void data,
int *  got_frame,
AVPacket avpkt 
)
static

Definition at line 389 of file pngdec.c.

static void deloco_rgb24 ( uint8_t dst,
int  size 
)
static

Definition at line 273 of file pngdec.c.

Referenced by png_handle_row().

void ff_add_png_paeth_prediction ( uint8_t dst,
uint8_t src,
uint8_t top,
int  w,
int  bpp 
)

Definition at line 136 of file pngdec.c.

Referenced by ff_pngdsp_init(), and png_filter_row().

static av_cold int png_dec_end ( AVCodecContext avctx)
static

Definition at line 645 of file pngdec.c.

static av_cold int png_dec_init ( AVCodecContext avctx)
static

Definition at line 633 of file pngdec.c.

static int png_decode_idat ( PNGDecContext s,
int  length 
)
static

Definition at line 361 of file pngdec.c.

Referenced by decode_frame().

static void png_filter_row ( PNGDSPContext dsp,
uint8_t dst,
int  filter_type,
uint8_t src,
uint8_t last,
int  size,
int  bpp 
)
static

Definition at line 193 of file pngdec.c.

Referenced by png_handle_row().

static void png_handle_row ( PNGDecContext s)
static

Definition at line 284 of file pngdec.c.

Referenced by png_decode_idat().

static void png_put_interlaced_row ( uint8_t dst,
int  width,
int  bits_per_pixel,
int  pass,
int  color_type,
const uint8_t src 
)
static

Definition at line 81 of file pngdec.c.

Referenced by png_handle_row().

Variable Documentation

AVCodec ff_png_decoder
Initial value:
= {
.name = "png",
.priv_data_size = sizeof(PNGDecContext),
.capabilities = CODEC_CAP_DR1 ,
.long_name = NULL_IF_CONFIG_SMALL("PNG (Portable Network Graphics) image"),
}
static int decode(MimicContext *ctx, int quality, int num_coeffs, int is_iframe)
Definition: mimic.c:228
static int init(AVCodecParserContext *s)
Definition: h264_parser.c:335
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:88
static av_cold int png_dec_init(AVCodecContext *avctx)
Definition: pngdec.c:633
static void close(AVCodecParserContext *s)
Definition: h264_parser.c:326
struct PNGDecContext PNGDecContext
static av_cold int png_dec_end(AVCodecContext *avctx)
Definition: pngdec.c:645
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: pngdec.c:389

Definition at line 657 of file pngdec.c.

const uint8_t png_pass_dsp_mask[NB_PASSES]
static
Initial value:
= {
0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff
}

Definition at line 74 of file pngdec.c.

Referenced by png_put_interlaced_row().

const uint8_t png_pass_dsp_ymask[NB_PASSES]
static
Initial value:
= {
0xff, 0xff, 0x0f, 0xcc, 0x33, 0xff, 0x55,
}

Definition at line 69 of file pngdec.c.

Referenced by png_handle_row().