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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 "idctdsp.h"
#include "internal.h"
#include "jpegtables.h"
#include "mjpeg.h"
#include "mjpegdec.h"
#include "jpeglsdec.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 build_vlc (VLC *vlc, const uint8_t *bits_table, const uint8_t *val_table, int nb_codes, int use_static, int is_ac)
 
static void build_basic_mjpeg_vlc (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, int16_t *quant_matrix)
 
static int decode_dc_progressive (MJpegDecodeContext *s, int16_t *block, int component, int dc_index, int16_t *quant_matrix, int Al)
 
static int decode_block_progressive (MJpegDecodeContext *s, int16_t *block, uint8_t *last_nnz, int ac_index, int16_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, int16_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)
 
int ff_mjpeg_decode_frame (AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
 
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

#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
const char * s
Definition: avisynth_c.h:768
re
float re
Definition: fft.c:82
block
static int16_t block[64]
Definition: dct.c:113
UPDATE_CACHE
#define UPDATE_CACHE(name, gb)
Definition: get_bits.h:160
LAST_SKIP_BITS
#define LAST_SKIP_BITS(name, gb, num)
Definition: get_bits.h:181
SHOW_UBITS
#define SHOW_UBITS(name, gb, num)
Definition: get_bits.h:193

Definition at line 823 of file mjpegdec.c.

Referenced by decode_block_refinement().

#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; \
}
s
const char * s
Definition: avisynth_c.h:768
run
uint8_t run
Definition: svq3.c:206
block
static int16_t block[64]
Definition: dct.c:113
se
#define se(...)
Definition: vaapi_encode_h26x.h:38
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
else
else
Definition: h264pred_template.c:463
return
return
Definition: audio_convert.c:415
if
if(ret< 0)
Definition: vf_mcdeint.c:282
REFINE_BIT
#define REFINE_BIT(j)
Definition: mjpegdec.c:823

Definition at line 831 of file mjpegdec.c.

Referenced by decode_block_refinement().

#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)
length
GLsizei GLsizei * length
Definition: opengl_enc.c:115
src
#define src
Definition: vp9dsp.c:530
if
if(ret< 0)
Definition: vf_mcdeint.c:282

Referenced by ff_mjpeg_find_marker().

Function Documentation

static int build_vlc ( VLC *  vlc,
const uint8_t *  bits_table,
const uint8_t *  val_table,
int  nb_codes,
int  use_static,
int  is_ac 
)
static

Definition at line 51 of file mjpegdec.c.

Referenced by build_basic_mjpeg_vlc(), and ff_mjpeg_decode_dht().

static void build_basic_mjpeg_vlc ( MJpegDecodeContext *  s)
static

Definition at line 74 of file mjpegdec.c.

Referenced by ff_mjpeg_decode_init().

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

Definition at line 90 of file mjpegdec.c.

Referenced by ff_mjpeg_decode_init(), and mjpeg_decode_com().

static void init_idct ( AVCodecContext *  avctx)
static

Definition at line 101 of file mjpegdec.c.

Referenced by ff_mjpeg_decode_init(), and ff_mjpeg_decode_sof().

av_cold int ff_mjpeg_decode_init ( AVCodecContext *  avctx)

Definition at line 110 of file mjpegdec.c.

Referenced by mxpeg_decode_init().

int ff_mjpeg_decode_dqt ( MJpegDecodeContext *  s)

Definition at line 167 of file mjpegdec.c.

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

int ff_mjpeg_decode_dht ( MJpegDecodeContext *  s)

Definition at line 204 of file mjpegdec.c.

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

int ff_mjpeg_decode_sof ( MJpegDecodeContext *  s)

Definition at line 263 of file mjpegdec.c.

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

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

Definition at line 666 of file mjpegdec.c.

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

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

Definition at line 684 of file mjpegdec.c.

Referenced by mjpeg_decode_scan().

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

Definition at line 733 of file mjpegdec.c.

Referenced by mjpeg_decode_scan().

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

Definition at line 751 of file mjpegdec.c.

Referenced by mjpeg_decode_scan_progressive_ac().

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

Definition at line 849 of file mjpegdec.c.

Referenced by mjpeg_decode_scan_progressive_ac().

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

Definition at line 914 of file mjpegdec.c.

Referenced by mjpeg_decode_scan(), and mjpeg_decode_scan_progressive_ac().

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

Definition at line 948 of file mjpegdec.c.

Referenced by ff_mjpeg_decode_sos().

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

Definition at line 1070 of file mjpegdec.c.

Referenced by ff_mjpeg_decode_sos().

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 1220 of file mjpegdec.c.

Referenced by mjpeg_decode_scan().

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

Definition at line 1236 of file mjpegdec.c.

Referenced by mjpeg_decode_scan(), and mjpeg_idct_scan_progressive_ac().

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 1251 of file mjpegdec.c.

Referenced by ff_mjpeg_decode_sos().

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

Definition at line 1372 of file mjpegdec.c.

Referenced by ff_mjpeg_decode_sos().

static void mjpeg_idct_scan_progressive_ac ( MJpegDecodeContext *  s)
static

Definition at line 1420 of file mjpegdec.c.

Referenced by ff_mjpeg_decode_frame().

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

Definition at line 1455 of file mjpegdec.c.

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

static int mjpeg_decode_dri ( MJpegDecodeContext *  s)
static

Definition at line 1615 of file mjpegdec.c.

Referenced by ff_mjpeg_decode_frame().

static int mjpeg_decode_app ( MJpegDecodeContext *  s)
static

Definition at line 1627 of file mjpegdec.c.

Referenced by ff_mjpeg_decode_frame().

static int mjpeg_decode_com ( MJpegDecodeContext *  s)
static

Definition at line 1878 of file mjpegdec.c.

Referenced by ff_mjpeg_decode_frame().

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

Definition at line 1918 of file mjpegdec.c.

Referenced by 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 1943 of file mjpegdec.c.

Referenced by ff_mjpeg_decode_frame(), and mxpeg_decode_frame().

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

Definition at line 2063 of file mjpegdec.c.

Referenced by sp5x_decode_frame().

av_cold int ff_mjpeg_decode_end ( AVCodecContext *  avctx)

Definition at line 2478 of file mjpegdec.c.

Referenced by mxpeg_decode_end().

static void decode_flush ( AVCodecContext *  avctx)
static

Definition at line 2510 of file mjpegdec.c.

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