FFmpeg
Macros | Functions | Variables
mjpegenc.c File Reference
#include "libavutil/pixdesc.h"
#include "avcodec.h"
#include "jpegtables.h"
#include "mjpegenc_common.h"
#include "mjpegenc_huffman.h"
#include "mpegvideo.h"
#include "mjpeg.h"
#include "mjpegenc.h"
#include "profiles.h"

Go to the source code of this file.

Macros

#define OFFSET(x)   offsetof(MpegEncContext, x)
 
#define VE   AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
 

Functions

static av_cold void init_uni_ac_vlc (const uint8_t huff_size_ac[256], uint8_t *uni_ac_vlc_len)
 
int ff_mjpeg_encode_stuffing (MpegEncContext *s)
 Writes the complete JPEG frame when optimal huffman tables are enabled, otherwise writes the stuffing. More...
 
static int alloc_huffman (MpegEncContext *s)
 
av_cold int ff_mjpeg_encode_init (MpegEncContext *s)
 
av_cold void ff_mjpeg_encode_close (MpegEncContext *s)
 
static void ff_mjpeg_encode_code (MJpegContext *s, uint8_t table_id, int code)
 Add code and table_id to the JPEG buffer. More...
 
static void ff_mjpeg_encode_coef (MJpegContext *s, uint8_t table_id, int val, int run)
 Add the coefficient's data to the JPEG buffer. More...
 
static void record_block (MpegEncContext *s, int16_t *block, int n)
 Add the block's data into the JPEG buffer. More...
 
static void encode_block (MpegEncContext *s, int16_t *block, int n)
 
void ff_mjpeg_encode_mb (MpegEncContext *s, int16_t block[12][64])
 

Variables

static const AVOption options []
 

Detailed Description

MJPEG encoder.

Definition in file mjpegenc.c.

Macro Definition Documentation

◆ OFFSET

#define OFFSET (   x)    offsetof(MpegEncContext, x)

Definition at line 585 of file mjpegenc.c.

◆ VE

Definition at line 586 of file mjpegenc.c.

Function Documentation

◆ init_uni_ac_vlc()

static av_cold void init_uni_ac_vlc ( const uint8_t  huff_size_ac[256],
uint8_t *  uni_ac_vlc_len 
)
static

Definition at line 44 of file mjpegenc.c.

Referenced by ff_mjpeg_encode_init(), and ff_mjpeg_encode_stuffing().

◆ ff_mjpeg_encode_stuffing()

int ff_mjpeg_encode_stuffing ( MpegEncContext s)

Writes the complete JPEG frame when optimal huffman tables are enabled, otherwise writes the stuffing.

Header + values + stuffing.

Parameters
sThe MpegEncContext.
Returns
int Error code, 0 if successful.

Definition at line 186 of file mjpegenc.c.

Referenced by write_slice_end().

◆ alloc_huffman()

static int alloc_huffman ( MpegEncContext s)
static

Definition at line 233 of file mjpegenc.c.

Referenced by ff_mjpeg_encode_init().

◆ ff_mjpeg_encode_init()

av_cold int ff_mjpeg_encode_init ( MpegEncContext s)

Definition at line 261 of file mjpegenc.c.

Referenced by ff_mpv_encode_init().

◆ ff_mjpeg_encode_close()

av_cold void ff_mjpeg_encode_close ( MpegEncContext s)

Definition at line 323 of file mjpegenc.c.

Referenced by ff_mpv_encode_end().

◆ ff_mjpeg_encode_code()

static void ff_mjpeg_encode_code ( MJpegContext s,
uint8_t  table_id,
int  code 
)
inlinestatic

Add code and table_id to the JPEG buffer.

Parameters
sThe MJpegContext which contains the JPEG buffer.
table_idWhich Huffman table the code belongs to.
codeThe encoded exponent of the coefficients and the run-bits.

Definition at line 338 of file mjpegenc.c.

Referenced by ff_mjpeg_encode_coef(), and record_block().

◆ ff_mjpeg_encode_coef()

static void ff_mjpeg_encode_coef ( MJpegContext s,
uint8_t  table_id,
int  val,
int  run 
)
static

Add the coefficient's data to the JPEG buffer.

Parameters
sThe MJpegContext which contains the JPEG buffer.
table_idWhich Huffman table the code belongs to.
valThe coefficient.
runThe run-bits.

Definition at line 353 of file mjpegenc.c.

Referenced by record_block().

◆ record_block()

static void record_block ( MpegEncContext s,
int16_t *  block,
int  n 
)
static

Add the block's data into the JPEG buffer.

Parameters
sThe MJpegEncContext that contains the JPEG buffer.
blockThe block.
nThe block's index or number.

Definition at line 381 of file mjpegenc.c.

Referenced by ff_mjpeg_encode_mb().

◆ encode_block()

static void encode_block ( MpegEncContext s,
int16_t *  block,
int  n 
)
static

Definition at line 424 of file mjpegenc.c.

Referenced by ff_mjpeg_encode_mb().

◆ ff_mjpeg_encode_mb()

void ff_mjpeg_encode_mb ( MpegEncContext s,
int16_t  block[12][64] 
)

Definition at line 482 of file mjpegenc.c.

Referenced by encode_mb_internal().

Variable Documentation

◆ options

const AVOption options[]
static
Initial value:
= {
{ "pred", "Prediction method", OFFSET(pred), AV_OPT_TYPE_INT, { .i64 = 1 }, 1, 3, VE, "pred" },
{ "left", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 1 }, INT_MIN, INT_MAX, VE, "pred" },
{ "plane", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 2 }, INT_MIN, INT_MAX, VE, "pred" },
{ "median", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 3 }, INT_MIN, INT_MAX, VE, "pred" },
{ "huffman", "Huffman table strategy", OFFSET(huffman), AV_OPT_TYPE_INT, { .i64 = HUFFMAN_TABLE_OPTIMAL }, 0, NB_HUFFMAN_TABLE_OPTION - 1, VE, "huffman" },
{ "default", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = HUFFMAN_TABLE_DEFAULT }, INT_MIN, INT_MAX, VE, "huffman" },
{ "optimal", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = HUFFMAN_TABLE_OPTIMAL }, INT_MIN, INT_MAX, VE, "huffman" },
{ "force_duplicated_matrix", "Always write luma and chroma matrix for mjpeg, useful for rtp streaming.", OFFSET(force_duplicated_matrix), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, VE },
{ NULL},
}

Definition at line 587 of file mjpegenc.c.

FF_MPV_DEPRECATED_A53_CC_OPT
#define FF_MPV_DEPRECATED_A53_CC_OPT
Definition: mpegvideo.h:665
HUFFMAN_TABLE_OPTIMAL
@ HUFFMAN_TABLE_OPTIMAL
Compute and use optimal Huffman tables.
Definition: mjpegenc.h:97
NB_HUFFMAN_TABLE_OPTION
@ NB_HUFFMAN_TABLE_OPTION
Definition: mjpegenc.h:98
NULL
#define NULL
Definition: coverity.c:32
FF_MPV_DEPRECATED_BFRAME_OPTS
#define FF_MPV_DEPRECATED_BFRAME_OPTS
Definition: mpegvideo.h:669
FF_MPV_DEPRECATED_MPEG_QUANT_OPT
#define FF_MPV_DEPRECATED_MPEG_QUANT_OPT
Definition: mpegvideo.h:663
HUFFMAN_TABLE_DEFAULT
@ HUFFMAN_TABLE_DEFAULT
Use the default Huffman tables.
Definition: mjpegenc.h:96
OFFSET
#define OFFSET(x)
Definition: mjpegenc.c:585
VE
#define VE
Definition: mjpegenc.c:586
pred
static const float pred[4]
Definition: siprdata.h:259
AV_OPT_TYPE_INT
@ AV_OPT_TYPE_INT
Definition: opt.h:224
AV_OPT_TYPE_BOOL
@ AV_OPT_TYPE_BOOL
Definition: opt.h:241
FF_MPV_COMMON_OPTS
#define FF_MPV_COMMON_OPTS
Definition: mpegvideo.h:610
AV_OPT_TYPE_CONST
@ AV_OPT_TYPE_CONST
Definition: opt.h:233