FFmpeg  4.4.7
Macros | Functions
mjpegdec.c File Reference

MJPEG decoder. More...

#include "libavutil/imgutils.h"
#include "libavutil/avassert.h"
#include "libavutil/opt.h"
#include "avcodec.h"
#include "blockdsp.h"
#include "copy_block.h"
#include "decode.h"
#include "hwconfig.h"
#include "idctdsp.h"
#include "internal.h"
#include "jpegtables.h"
#include "mjpeg.h"
#include "mjpegdec.h"
#include "jpeglsdec.h"
#include "profiles.h"
#include "put_bits.h"
#include "tiff.h"
#include "exif.h"
#include "bytestream.h"

Go to the source code of this file.

Macros

#define REFINE_BIT(j)
 
#define ZERO_RUN
 
#define copy_data_segment(skip)
 

Functions

static int init_default_huffman_tables (MJpegDecodeContext *s)
 
static void parse_avid (MJpegDecodeContext *s, uint8_t *buf, int len)
 
static void init_idct (AVCodecContext *avctx)
 
av_cold int ff_mjpeg_decode_init (AVCodecContext *avctx)
 
int ff_mjpeg_decode_dqt (MJpegDecodeContext *s)
 
int ff_mjpeg_decode_dht (MJpegDecodeContext *s)
 
int ff_mjpeg_decode_sof (MJpegDecodeContext *s)
 
static int mjpeg_decode_dc (MJpegDecodeContext *s, int dc_index)
 
static int decode_block (MJpegDecodeContext *s, int16_t *block, int component, int dc_index, int ac_index, uint16_t *quant_matrix)
 
static int decode_dc_progressive (MJpegDecodeContext *s, int16_t *block, int component, int dc_index, uint16_t *quant_matrix, int Al)
 
static int decode_block_progressive (MJpegDecodeContext *s, int16_t *block, uint8_t *last_nnz, int ac_index, uint16_t *quant_matrix, int ss, int se, int Al, int *EOBRUN)
 
static int decode_block_refinement (MJpegDecodeContext *s, int16_t *block, uint8_t *last_nnz, int ac_index, uint16_t *quant_matrix, int ss, int se, int Al, int *EOBRUN)
 
static int handle_rstn (MJpegDecodeContext *s, int nb_components)
 
static int ljpeg_decode_rgb_scan (MJpegDecodeContext *s, int nb_components, int predictor, int point_transform)
 
static int ljpeg_decode_yuv_scan (MJpegDecodeContext *s, int predictor, int point_transform, int nb_components)
 
static av_always_inline void mjpeg_copy_block (MJpegDecodeContext *s, uint8_t *dst, const uint8_t *src, int linesize, int lowres)
 
static void shift_output (MJpegDecodeContext *s, uint8_t *ptr, int linesize)
 
static int mjpeg_decode_scan (MJpegDecodeContext *s, int nb_components, int Ah, int Al, const uint8_t *mb_bitmask, int mb_bitmask_size, const AVFrame *reference)
 
static int mjpeg_decode_scan_progressive_ac (MJpegDecodeContext *s, int ss, int se, int Ah, int Al)
 
static void mjpeg_idct_scan_progressive_ac (MJpegDecodeContext *s)
 
int ff_mjpeg_decode_sos (MJpegDecodeContext *s, const uint8_t *mb_bitmask, int mb_bitmask_size, const AVFrame *reference)
 
static int mjpeg_decode_dri (MJpegDecodeContext *s)
 
static int mjpeg_decode_app (MJpegDecodeContext *s)
 
static int mjpeg_decode_com (MJpegDecodeContext *s)
 
static int find_marker (const uint8_t **pbuf_ptr, const uint8_t *buf_end)
 
int ff_mjpeg_find_marker (MJpegDecodeContext *s, const uint8_t **buf_ptr, const uint8_t *buf_end, const uint8_t **unescaped_buf_ptr, int *unescaped_buf_size)
 
static void reset_icc_profile (MJpegDecodeContext *s)
 
static int smv_process_frame (AVCodecContext *avctx, AVFrame *frame)
 
static int mjpeg_get_packet (AVCodecContext *avctx)
 
int ff_mjpeg_receive_frame (AVCodecContext *avctx, AVFrame *frame)
 
av_cold int ff_mjpeg_decode_end (AVCodecContext *avctx)
 
static void decode_flush (AVCodecContext *avctx)
 

Detailed Description

MJPEG decoder.

Definition in file mjpegdec.c.

Macro Definition Documentation

◆ REFINE_BIT

#define REFINE_BIT (   j)
Value:
{ \
UPDATE_CACHE(re, &s->gb); \
sign = block[j] >> 15; \
block[j] += SHOW_UBITS(re, &s->gb, 1) * \
((quant_matrix[i] ^ sign) - sign) << Al; \
LAST_SKIP_BITS(re, &s->gb, 1); \
}
s
#define s(width, name)
Definition: cbs_vp9.c:257
re
float re
Definition: fft.c:82
SHOW_UBITS
#define SHOW_UBITS(name, gb, num)
Definition: get_bits.h:211
i
int i
Definition: input.c:407
block
static int16_t block[64]
Definition: dct.c:116

Definition at line 947 of file mjpegdec.c.

◆ ZERO_RUN

#define ZERO_RUN
Value:
for (; ; i++) { \
if (i > last) { \
i += run; \
if (i > se) { \
av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i); \
return -1; \
} \
break; \
} \
j = s->scantable.permutated[i]; \
if (block[j]) \
REFINE_BIT(j) \
else if (run-- == 0) \
break; \
}
se
#define se(name, range_min, range_max)
Definition: cbs_h2645.c:275
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
run
uint8_t run
Definition: svq3.c:205

Definition at line 955 of file mjpegdec.c.

◆ copy_data_segment

#define copy_data_segment (   skip)
Value:
do { \
ptrdiff_t length = (ptr - src) - (skip); \
if (length > 0) { \
memcpy(dst, src, length); \
dst += length; \
src = ptr; \
} \
} while (0)
src
#define src
Definition: vp8dsp.c:255

Function Documentation

◆ init_default_huffman_tables()

static int init_default_huffman_tables ( MJpegDecodeContext *  s)
static

Definition at line 54 of file mjpegdec.c.

Referenced by ff_mjpeg_decode_init().

◆ parse_avid()

static void parse_avid ( MJpegDecodeContext *  s,
uint8_t *  buf,
int  len 
)
static

Definition at line 97 of file mjpegdec.c.

Referenced by ff_mjpeg_decode_init(), and mjpeg_decode_com().

◆ init_idct()

static void init_idct ( AVCodecContext *  avctx)
static

Definition at line 108 of file mjpegdec.c.

Referenced by ff_mjpeg_decode_init(), and ff_mjpeg_decode_sof().

◆ ff_mjpeg_decode_init()

av_cold int ff_mjpeg_decode_init ( AVCodecContext *  avctx)

Definition at line 117 of file mjpegdec.c.

Referenced by mxpeg_decode_init().

◆ ff_mjpeg_decode_dqt()

int ff_mjpeg_decode_dqt ( MJpegDecodeContext *  s)

Definition at line 195 of file mjpegdec.c.

Referenced by ff_mjpeg_receive_frame(), mjpegb_decode_frame(), and mxpeg_decode_frame().

◆ ff_mjpeg_decode_dht()

int ff_mjpeg_decode_dht ( MJpegDecodeContext *  s)

Definition at line 236 of file mjpegdec.c.

Referenced by ff_mjpeg_decode_init(), ff_mjpeg_receive_frame(), mjpegb_decode_frame(), and mxpeg_decode_frame().

◆ ff_mjpeg_decode_sof()

int ff_mjpeg_decode_sof ( MJpegDecodeContext *  s)

Definition at line 297 of file mjpegdec.c.

Referenced by ff_mjpeg_receive_frame(), mjpegb_decode_frame(), and mxpeg_decode_frame().

◆ mjpeg_decode_dc()

static int mjpeg_decode_dc ( MJpegDecodeContext *  s,
int  dc_index 
)
inlinestatic

Definition at line 789 of file mjpegdec.c.

Referenced by decode_block(), decode_dc_progressive(), ljpeg_decode_rgb_scan(), and ljpeg_decode_yuv_scan().

◆ decode_block()

static int decode_block ( MJpegDecodeContext *  s,
int16_t *  block,
int  component,
int  dc_index,
int  ac_index,
uint16_t *  quant_matrix 
)
static

Definition at line 807 of file mjpegdec.c.

Referenced by mjpeg_decode_scan().

◆ decode_dc_progressive()

static int decode_dc_progressive ( MJpegDecodeContext *  s,
int16_t *  block,
int  component,
int  dc_index,
uint16_t *  quant_matrix,
int  Al 
)
static

Definition at line 856 of file mjpegdec.c.

Referenced by mjpeg_decode_scan().

◆ decode_block_progressive()

static int decode_block_progressive ( MJpegDecodeContext *  s,
int16_t *  block,
uint8_t *  last_nnz,
int  ac_index,
uint16_t *  quant_matrix,
int  ss,
int  se,
int  Al,
int *  EOBRUN 
)
static

Definition at line 874 of file mjpegdec.c.

Referenced by mjpeg_decode_scan_progressive_ac().

◆ decode_block_refinement()

static int decode_block_refinement ( MJpegDecodeContext *  s,
int16_t *  block,
uint8_t *  last_nnz,
int  ac_index,
uint16_t *  quant_matrix,
int  ss,
int  se,
int  Al,
int *  EOBRUN 
)
static

Definition at line 973 of file mjpegdec.c.

Referenced by mjpeg_decode_scan_progressive_ac().

◆ handle_rstn()

static int handle_rstn ( MJpegDecodeContext *  s,
int  nb_components 
)
static

Definition at line 1038 of file mjpegdec.c.

Referenced by mjpeg_decode_scan(), and mjpeg_decode_scan_progressive_ac().

◆ ljpeg_decode_rgb_scan()

static int ljpeg_decode_rgb_scan ( MJpegDecodeContext *  s,
int  nb_components,
int  predictor,
int  point_transform 
)
static

Definition at line 1073 of file mjpegdec.c.

Referenced by ff_mjpeg_decode_sos().

◆ ljpeg_decode_yuv_scan()

static int ljpeg_decode_yuv_scan ( MJpegDecodeContext *  s,
int  predictor,
int  point_transform,
int  nb_components 
)
static

Definition at line 1245 of file mjpegdec.c.

Referenced by ff_mjpeg_decode_sos().

◆ mjpeg_copy_block()

static av_always_inline void mjpeg_copy_block ( MJpegDecodeContext *  s,
uint8_t *  dst,
const uint8_t *  src,
int  linesize,
int  lowres 
)
static

Definition at line 1399 of file mjpegdec.c.

Referenced by mjpeg_decode_scan().

◆ shift_output()

static void shift_output ( MJpegDecodeContext *  s,
uint8_t *  ptr,
int  linesize 
)
static

Definition at line 1415 of file mjpegdec.c.

Referenced by mjpeg_decode_scan(), and mjpeg_idct_scan_progressive_ac().

◆ mjpeg_decode_scan()

static int mjpeg_decode_scan ( MJpegDecodeContext *  s,
int  nb_components,
int  Ah,
int  Al,
const uint8_t *  mb_bitmask,
int  mb_bitmask_size,
const AVFrame *  reference 
)
static

Definition at line 1430 of file mjpegdec.c.

Referenced by ff_mjpeg_decode_sos().

◆ mjpeg_decode_scan_progressive_ac()

static int mjpeg_decode_scan_progressive_ac ( MJpegDecodeContext *  s,
int  ss,
int  se,
int  Ah,
int  Al 
)
static

Definition at line 1551 of file mjpegdec.c.

Referenced by ff_mjpeg_decode_sos().

◆ mjpeg_idct_scan_progressive_ac()

static void mjpeg_idct_scan_progressive_ac ( MJpegDecodeContext *  s)
static

Definition at line 1606 of file mjpegdec.c.

Referenced by ff_mjpeg_receive_frame().

◆ ff_mjpeg_decode_sos()

int ff_mjpeg_decode_sos ( MJpegDecodeContext *  s,
const uint8_t *  mb_bitmask,
int  mb_bitmask_size,
const AVFrame *  reference 
)

Definition at line 1641 of file mjpegdec.c.

Referenced by ff_mjpeg_receive_frame(), mjpegb_decode_frame(), and mxpeg_decode_frame().

◆ mjpeg_decode_dri()

static int mjpeg_decode_dri ( MJpegDecodeContext *  s)
static

Definition at line 1819 of file mjpegdec.c.

Referenced by ff_mjpeg_receive_frame().

◆ mjpeg_decode_app()

static int mjpeg_decode_app ( MJpegDecodeContext *  s)
static

Definition at line 1831 of file mjpegdec.c.

Referenced by ff_mjpeg_receive_frame().

◆ mjpeg_decode_com()

static int mjpeg_decode_com ( MJpegDecodeContext *  s)
static

Definition at line 2148 of file mjpegdec.c.

Referenced by ff_mjpeg_receive_frame().

◆ find_marker()

static int find_marker ( const uint8_t **  pbuf_ptr,
const uint8_t *  buf_end 
)
static

Definition at line 2188 of file mjpegdec.c.

Referenced by ff_mjpeg_find_marker().

◆ ff_mjpeg_find_marker()

int ff_mjpeg_find_marker ( MJpegDecodeContext *  s,
const uint8_t **  buf_ptr,
const uint8_t *  buf_end,
const uint8_t **  unescaped_buf_ptr,
int *  unescaped_buf_size 
)

Definition at line 2213 of file mjpegdec.c.

Referenced by ff_mjpeg_receive_frame(), and mxpeg_decode_frame().

◆ reset_icc_profile()

static void reset_icc_profile ( MJpegDecodeContext *  s)
static

Definition at line 2333 of file mjpegdec.c.

Referenced by ff_mjpeg_decode_end(), and ff_mjpeg_receive_frame().

◆ smv_process_frame()

static int smv_process_frame ( AVCodecContext *  avctx,
AVFrame *  frame 
)
static

Definition at line 2349 of file mjpegdec.c.

Referenced by ff_mjpeg_receive_frame().

◆ mjpeg_get_packet()

static int mjpeg_get_packet ( AVCodecContext *  avctx)
static

Definition at line 2383 of file mjpegdec.c.

Referenced by ff_mjpeg_receive_frame().

◆ ff_mjpeg_receive_frame()

int ff_mjpeg_receive_frame ( AVCodecContext *  avctx,
AVFrame *  frame 
)

Definition at line 2407 of file mjpegdec.c.

◆ ff_mjpeg_decode_end()

av_cold int ff_mjpeg_decode_end ( AVCodecContext *  avctx)

Definition at line 2900 of file mjpegdec.c.

Referenced by mxpeg_decode_end().

◆ decode_flush()

static void decode_flush ( AVCodecContext *  avctx)
static

Definition at line 2941 of file mjpegdec.c.

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