mjpegdec.c File Reference

#include "config_components.h"
#include "libavutil/attributes.h"
#include "libavutil/imgutils.h"
#include "libavutil/avassert.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "avcodec.h"
#include "blockdsp.h"
#include "codec_internal.h"
#include "copy_block.h"
#include "decode.h"
#include "exif.h"
#include "exif_internal.h"
#include "hwaccel_internal.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"

Go to the source code of this file.

Macros
#define	REFINE_BIT(j)
#define	ZERO_RUN

Functions
static void	mjpeg_find_raw_scan_data (MJpegDecodeContext *s, const uint8_t **pbuf_ptr, size_t *pbuf_size)
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)
static int	mjpeg_parse_len (MJpegDecodeContext *s, int *plen, const char *name)
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, int *val)
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	ljpeg_decode_rgb_scan (MJpegDecodeContext *s)
static int	ljpeg_decode_yuv_scan (MJpegDecodeContext *s)
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)
static int	mjpeg_decode_scan_progressive_ac (MJpegDecodeContext *s)
static void	mjpeg_idct_scan_progressive_ac (MJpegDecodeContext *s)
int	ff_mjpeg_decode_sos (MJpegDecodeContext *s)
static int	mjpeg_decode_dri (MJpegDecodeContext *s)
static int	mjpeg_decode_app (MJpegDecodeContext *s, int start_code)
static int	mjpeg_decode_com (MJpegDecodeContext *s)
int	ff_mjpeg_find_marker (const uint8_t **pbuf_ptr, const uint8_t *buf_end)
int	ff_mjpeg_unescape_sos (MJpegDecodeContext *s)
static void	reset_icc_profile (MJpegDecodeContext *s)
int	ff_mjpeg_decode_frame_from_buf (AVCodecContext *avctx, AVFrame *frame, int *got_frame, const AVPacket *avpkt, const uint8_t *buf, const int buf_size)
int	ff_mjpeg_decode_frame (AVCodecContext *avctx, AVFrame *frame, int *got_frame, AVPacket *avpkt)
av_cold int	ff_mjpeg_decode_end (AVCodecContext *avctx)
static av_cold 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);                                  \
}

Definition at line 992 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->permutated_scantable[i];                                 \
    if (block[j])                                                   \
        REFINE_BIT(j)                                               \
    else if (run-- == 0)                                            \
        break;                                                      \
}

Definition at line 1000 of file mjpegdec.c.

Function Documentation

mjpeg_find_raw_scan_data()

static void mjpeg_find_raw_scan_data ( MJpegDecodeContext *  s, const uint8_t **  pbuf_ptr, size_t *  pbuf_size  )

static

Definition at line 2210 of file mjpegdec.c.

Referenced by ff_mjpeg_decode_sos().

init_default_huffman_tables()

static int init_default_huffman_tables ( MJpegDecodeContext *  s )

static

Definition at line 62 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 105 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 115 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 124 of file mjpegdec.c.

Referenced by mxpeg_decode_init().

mjpeg_parse_len()

static int mjpeg_parse_len ( MJpegDecodeContext *  s, int *  plen, const char *  name  )

static

Definition at line 196 of file mjpegdec.c.

Referenced by ff_mjpeg_decode_dht(), ff_mjpeg_decode_dqt(), ff_mjpeg_decode_sof(), ff_mjpeg_decode_sos(), mjpeg_decode_app(), and mjpeg_decode_com().

ff_mjpeg_decode_dqt()

int ff_mjpeg_decode_dqt

(

MJpegDecodeContext *

s

)

Definition at line 208 of file mjpegdec.c.

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

ff_mjpeg_decode_dht()

int ff_mjpeg_decode_dht

(

MJpegDecodeContext *

s

)

Definition at line 251 of file mjpegdec.c.

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

ff_mjpeg_decode_sof()

int ff_mjpeg_decode_sof

(

MJpegDecodeContext *

s

)

Definition at line 310 of file mjpegdec.c.

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

mjpeg_decode_dc()

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

inlinestatic

Definition at line 839 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 854 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 903 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 920 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 1018 of file mjpegdec.c.

Referenced by mjpeg_decode_scan_progressive_ac().

ljpeg_decode_rgb_scan()

static int ljpeg_decode_rgb_scan ( MJpegDecodeContext *  s )

static

Definition at line 1084 of file mjpegdec.c.

Referenced by ff_mjpeg_decode_sos().

ljpeg_decode_yuv_scan()

static int ljpeg_decode_yuv_scan ( MJpegDecodeContext *  s )

static

Definition at line 1237 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 1398 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 1414 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 )

static

Definition at line 1429 of file mjpegdec.c.

Referenced by ff_mjpeg_decode_sos().

mjpeg_decode_scan_progressive_ac()

static int mjpeg_decode_scan_progressive_ac ( MJpegDecodeContext *  s )

static

Definition at line 1589 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 1644 of file mjpegdec.c.

Referenced by ff_mjpeg_decode_frame_from_buf().

ff_mjpeg_decode_sos()

int ff_mjpeg_decode_sos

(

MJpegDecodeContext *

s

)

Definition at line 1679 of file mjpegdec.c.

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

mjpeg_decode_dri()

static int mjpeg_decode_dri ( MJpegDecodeContext *  s )

static

Definition at line 1824 of file mjpegdec.c.

Referenced by ff_mjpeg_decode_frame_from_buf().

mjpeg_decode_app()

static int mjpeg_decode_app ( MJpegDecodeContext *  s, int  start_code  )

static

Definition at line 1835 of file mjpegdec.c.

Referenced by ff_mjpeg_decode_frame_from_buf().

mjpeg_decode_com()

static int mjpeg_decode_com ( MJpegDecodeContext *  s )

static

Definition at line 2140 of file mjpegdec.c.

Referenced by ff_mjpeg_decode_frame_from_buf().

ff_mjpeg_find_marker()

int ff_mjpeg_find_marker	(	const uint8_t **	pbuf_ptr,
		const uint8_t *	buf_end
	)

Definition at line 2184 of file mjpegdec.c.

Referenced by ff_mjpeg_decode_frame_from_buf(), and mxpeg_decode_frame().

ff_mjpeg_unescape_sos()

int ff_mjpeg_unescape_sos

(

MJpegDecodeContext *

s

)

Definition at line 2240 of file mjpegdec.c.

Referenced by ff_mjpeg_handle_restart(), and mjpeg_decode_scan().

reset_icc_profile()

static void reset_icc_profile ( MJpegDecodeContext *  s )

static

Definition at line 2369 of file mjpegdec.c.

Referenced by ff_mjpeg_decode_end(), and ff_mjpeg_decode_frame_from_buf().

ff_mjpeg_decode_frame_from_buf()

int ff_mjpeg_decode_frame_from_buf	(	AVCodecContext *	avctx,
		AVFrame *	frame,
		int *	got_frame,
		const AVPacket *	avpkt,
		const uint8_t *	buf,
		const int	buf_size
	)

Definition at line 2383 of file mjpegdec.c.

Referenced by ff_mjpeg_decode_frame(), and sp5x_decode_frame().

ff_mjpeg_decode_frame()

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

Definition at line 2888 of file mjpegdec.c.

ff_mjpeg_decode_end()

av_cold int ff_mjpeg_decode_end

(

AVCodecContext *

avctx

)

Definition at line 2898 of file mjpegdec.c.

Referenced by mxpeg_decode_end().

decode_flush()

static av_cold void decode_flush ( AVCodecContext *  avctx )

static

Definition at line 2935 of file mjpegdec.c.