MJPEG decoder. More...

#include "libavutil/imgutils.h"
#include "libavutil/avassert.h"
#include "libavutil/opt.h"
#include "avcodec.h"
#include "copy_block.h"
#include "internal.h"
#include "mjpeg.h"
#include "mjpegdec.h"
#include "jpeglsdec.h"

Macros
#define	REFINE_BIT(j)

#define	ZERO_RUN

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)

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 void	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 nb_components, int predictor, int point_transform)

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

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

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

int	ff_mjpeg_decode_sos (MJpegDecodeContext s, const uint8_t mb_bitmask, 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[j] ^ sign) - sign) << Al;            \
    LAST_SKIP_BITS(re, &s->gb, 1);                                  \
}

Definition at line 646 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;                                                      \
}

Definition at line 654 of file mjpegdec.c.

Referenced by decode_block_refinement().

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 44 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 67 of file mjpegdec.c.

Referenced by ff_mjpeg_decode_init().

av_cold int ff_mjpeg_decode_init ( AVCodecContext * avctx )

Definition at line 83 of file mjpegdec.c.

Referenced by init(), and mxpeg_decode_init().

int ff_mjpeg_decode_dqt ( MJpegDecodeContext * s )

Definition at line 125 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 158 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 212 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 490 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 508 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 556 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 574 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 672 of file mjpegdec.c.

Referenced by mjpeg_decode_scan_progressive_ac().

static void handle_rstn	(	MJpegDecodeContext *	s,
		int	nb_components
	)

static

Definition at line 737 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 767 of file mjpegdec.c.

Referenced by ff_mjpeg_decode_sos().

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

static

Definition at line 854 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 997 of file mjpegdec.c.

Referenced by mjpeg_decode_scan().

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

static

Definition at line 1013 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 1124 of file mjpegdec.c.

Referenced by ff_mjpeg_decode_sos().

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

Definition at line 1182 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 1339 of file mjpegdec.c.

Referenced by ff_mjpeg_decode_frame().

static int mjpeg_decode_app ( MJpegDecodeContext * s )

static

Definition at line 1351 of file mjpegdec.c.

Referenced by ff_mjpeg_decode_frame().

static int mjpeg_decode_com ( MJpegDecodeContext * s )

static

Definition at line 1487 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 1522 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 1546 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 1634 of file mjpegdec.c.

Referenced by decode_frame(), and sp5x_decode_frame().

av_cold int ff_mjpeg_decode_end ( AVCodecContext * avctx )

Definition at line 1869 of file mjpegdec.c.

Referenced by end(), and mxpeg_decode_end().

static void decode_flush ( AVCodecContext * avctx )

static

Definition at line 1893 of file mjpegdec.c.

Macros

Functions

Detailed Description

Macro Definition Documentation

Function Documentation