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 "hwaccel.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"

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 int	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, 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)

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

◆ 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 893 of file mjpegdec.c.

Referenced by decode_block_refinement().

◆ 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;                                                      \
}

Definition at line 901 of file mjpegdec.c.

Referenced by decode_block_refinement().

◆ 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)

Referenced by ff_mjpeg_find_marker().

Function Documentation

◆ build_vlc()

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 52 of file mjpegdec.c.

Referenced by build_basic_mjpeg_vlc(), and ff_mjpeg_decode_dht().

◆ build_basic_mjpeg_vlc()

static int build_basic_mjpeg_vlc ( MJpegDecodeContext * s )

static

Definition at line 75 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 107 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 118 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 127 of file mjpegdec.c.

Referenced by decode_flush(), mxpeg_decode_init(), and sp5x_decode_frame().

◆ ff_mjpeg_decode_dqt()

int ff_mjpeg_decode_dqt ( MJpegDecodeContext * s )

Definition at line 188 of file mjpegdec.c.

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

◆ ff_mjpeg_decode_dht()

int ff_mjpeg_decode_dht ( MJpegDecodeContext * s )

Definition at line 229 of file mjpegdec.c.

Referenced by ff_mjpeg_decode_frame(), 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 293 of file mjpegdec.c.

Referenced by ff_mjpeg_decode_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 735 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 753 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 802 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 820 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 919 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 984 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 1018 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 1143 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 1297 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 1313 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 1328 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 1449 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 1501 of file mjpegdec.c.

Referenced by ff_mjpeg_decode_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 1536 of file mjpegdec.c.

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

◆ mjpeg_decode_dri()

static int mjpeg_decode_dri ( MJpegDecodeContext * s )

static

Definition at line 1716 of file mjpegdec.c.

Referenced by ff_mjpeg_decode_frame().

◆ mjpeg_decode_app()

static int mjpeg_decode_app ( MJpegDecodeContext * s )

static

Definition at line 1728 of file mjpegdec.c.

Referenced by ff_mjpeg_decode_frame().

◆ mjpeg_decode_com()

static int mjpeg_decode_com ( MJpegDecodeContext * s )

static

Definition at line 2037 of file mjpegdec.c.

Referenced by ff_mjpeg_decode_frame().

◆ find_marker()

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

static

Definition at line 2077 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 2102 of file mjpegdec.c.

Referenced by ff_mjpeg_decode_frame(), and mxpeg_decode_frame().

◆ reset_icc_profile()

static void reset_icc_profile ( MJpegDecodeContext * s )

static

Definition at line 2222 of file mjpegdec.c.

Referenced by ff_mjpeg_decode_end(), and ff_mjpeg_decode_frame().

◆ ff_mjpeg_decode_frame()

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

Definition at line 2236 of file mjpegdec.c.

Referenced by decode_flush(), and sp5x_decode_frame().

◆ ff_mjpeg_decode_end()

av_cold int ff_mjpeg_decode_end ( AVCodecContext * avctx )

Definition at line 2715 of file mjpegdec.c.

Referenced by decode_flush(), mxpeg_decode_end(), and sp5x_decode_frame().

◆ decode_flush()

static void decode_flush ( AVCodecContext * avctx )

static

Definition at line 2752 of file mjpegdec.c.

Macros

Functions

Detailed Description

Macro Definition Documentation

◆ REFINE_BIT

◆ ZERO_RUN

◆ copy_data_segment

Function Documentation

◆ build_vlc()

◆ build_basic_mjpeg_vlc()

◆ parse_avid()

◆ init_idct()

◆ ff_mjpeg_decode_init()

◆ ff_mjpeg_decode_dqt()

◆ ff_mjpeg_decode_dht()

◆ ff_mjpeg_decode_sof()

◆ mjpeg_decode_dc()

◆ decode_block()

◆ decode_dc_progressive()

◆ decode_block_progressive()

◆ decode_block_refinement()

◆ handle_rstn()

◆ ljpeg_decode_rgb_scan()

◆ ljpeg_decode_yuv_scan()

◆ mjpeg_copy_block()

◆ shift_output()

◆ mjpeg_decode_scan()

◆ mjpeg_decode_scan_progressive_ac()

◆ mjpeg_idct_scan_progressive_ac()

◆ ff_mjpeg_decode_sos()

◆ mjpeg_decode_dri()

◆ mjpeg_decode_app()

◆ mjpeg_decode_com()

◆ find_marker()

◆ ff_mjpeg_find_marker()

◆ reset_icc_profile()

◆ ff_mjpeg_decode_frame()

◆ ff_mjpeg_decode_end()

◆ decode_flush()