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

Go to the source code of this file.

Data Structures

struct  MJPEGEncContext
 

Macros

#define OFFSET(x)   offsetof(MJPEGEncContext, mjpeg.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)
 
static void mjpeg_encode_picture_header (MpegEncContext *s)
 
void ff_mjpeg_amv_encode_picture_header (MpegEncContext *s)
 
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)
 
static av_cold int mjpeg_encode_close (AVCodecContext *avctx)
 
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(MJPEGEncContext, mjpeg.x)

Definition at line 626 of file mjpegenc.c.

◆ VE

Definition at line 627 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 57 of file mjpegenc.c.

Referenced by ff_mjpeg_encode_init(), and ff_mjpeg_encode_stuffing().

◆ mjpeg_encode_picture_header()

static void mjpeg_encode_picture_header ( MpegEncContext s)
static

Definition at line 81 of file mjpegenc.c.

Referenced by ff_mjpeg_amv_encode_picture_header(), and ff_mjpeg_encode_stuffing().

◆ ff_mjpeg_amv_encode_picture_header()

void ff_mjpeg_amv_encode_picture_header ( MpegEncContext s)

Definition at line 93 of file mjpegenc.c.

Referenced by encode_picture().

◆ 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 220 of file mjpegenc.c.

Referenced by write_slice_end().

◆ alloc_huffman()

static int alloc_huffman ( MpegEncContext s)
static

Definition at line 266 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 294 of file mjpegenc.c.

Referenced by ff_mpv_encode_init().

◆ mjpeg_encode_close()

static av_cold int mjpeg_encode_close ( AVCodecContext avctx)
static

Definition at line 364 of file mjpegenc.c.

◆ 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 379 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 394 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 MpegEncContext that contains the JPEG buffer.
blockThe block.
nThe block's index or number.

Definition at line 422 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 465 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 523 of file mjpegenc.c.

Referenced by encode_mb_internal().

Variable Documentation

◆ options

const AVOption options[]
static
Initial value:
= {
{ "huffman", "Huffman table strategy", OFFSET(huffman), AV_OPT_TYPE_INT, { .i64 = HUFFMAN_TABLE_OPTIMAL }, 0, NB_HUFFMAN_TABLE_OPTION - 1, VE, .unit = "huffman" },
{ "default", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = HUFFMAN_TABLE_DEFAULT }, INT_MIN, INT_MAX, VE, .unit = "huffman" },
{ "optimal", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = HUFFMAN_TABLE_OPTIMAL }, INT_MIN, INT_MAX, VE, .unit = "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 628 of file mjpegenc.c.

FF_MPV_COMMON_OPTS
#define FF_MPV_COMMON_OPTS
Definition: mpegvideoenc.h:65
HUFFMAN_TABLE_OPTIMAL
@ HUFFMAN_TABLE_OPTIMAL
Compute and use optimal Huffman tables.
Definition: mjpegenc.h:100
NB_HUFFMAN_TABLE_OPTION
@ NB_HUFFMAN_TABLE_OPTION
Definition: mjpegenc.h:101
NULL
#define NULL
Definition: coverity.c:32
HUFFMAN_TABLE_DEFAULT
@ HUFFMAN_TABLE_DEFAULT
Use the default Huffman tables.
Definition: mjpegenc.h:99
OFFSET
#define OFFSET(x)
Definition: mjpegenc.c:626
VE
#define VE
Definition: mjpegenc.c:627
AV_OPT_TYPE_INT
@ AV_OPT_TYPE_INT
Definition: opt.h:225
AV_OPT_TYPE_BOOL
@ AV_OPT_TYPE_BOOL
Definition: opt.h:244
AV_OPT_TYPE_CONST
@ AV_OPT_TYPE_CONST
Definition: opt.h:234