FFmpeg
Macros | Functions
mpegvideo.c File Reference
#include "libavutil/attributes.h"
#include "libavutil/avassert.h"
#include "libavutil/imgutils.h"
#include "libavutil/internal.h"
#include "libavutil/mem.h"
#include "avcodec.h"
#include "blockdsp.h"
#include "idctdsp.h"
#include "mathops.h"
#include "mpeg_er.h"
#include "mpegutils.h"
#include "mpegvideo.h"
#include "mpegvideodata.h"
#include "refstruct.h"

Go to the source code of this file.

Macros

#define COPY(a)   bak->a = src->a
 
#define ALLOC_POOL(name, size, flags)
 

Functions

static void dct_unquantize_mpeg1_intra_c (MpegEncContext *s, int16_t *block, int n, int qscale)
 
static void dct_unquantize_mpeg1_inter_c (MpegEncContext *s, int16_t *block, int n, int qscale)
 
static void dct_unquantize_mpeg2_intra_c (MpegEncContext *s, int16_t *block, int n, int qscale)
 
static void dct_unquantize_mpeg2_intra_bitexact (MpegEncContext *s, int16_t *block, int n, int qscale)
 
static void dct_unquantize_mpeg2_inter_c (MpegEncContext *s, int16_t *block, int n, int qscale)
 
static void dct_unquantize_h263_intra_c (MpegEncContext *s, int16_t *block, int n, int qscale)
 
static void dct_unquantize_h263_inter_c (MpegEncContext *s, int16_t *block, int n, int qscale)
 
static void gray16 (uint8_t *dst, const uint8_t *src, ptrdiff_t linesize, int h)
 
static void gray8 (uint8_t *dst, const uint8_t *src, ptrdiff_t linesize, int h)
 
static av_cold void dsp_init (MpegEncContext *s)
 
av_cold void ff_init_scantable (const uint8_t *permutation, ScanTable *st, const uint8_t *src_scantable)
 
av_cold void ff_mpv_idct_init (MpegEncContext *s)
 
static int init_duplicate_context (MpegEncContext *s)
 
int ff_mpv_init_duplicate_contexts (MpegEncContext *s)
 Initialize an MpegEncContext's thread contexts. More...
 
static void free_duplicate_context (MpegEncContext *s)
 
static void free_duplicate_contexts (MpegEncContext *s)
 
static void backup_duplicate_context (MpegEncContext *bak, MpegEncContext *src)
 
int ff_update_duplicate_context (MpegEncContext *dst, const MpegEncContext *src)
 
void ff_mpv_common_defaults (MpegEncContext *s)
 Set the given MpegEncContext to common defaults (same for encoding and decoding). More...
 
static void free_buffer_pools (BufferPoolContext *pools)
 
int ff_mpv_init_context_frame (MpegEncContext *s)
 Initialize and allocates MpegEncContext fields dependent on the resolution. More...
 
static void clear_context (MpegEncContext *s)
 
av_cold int ff_mpv_common_init (MpegEncContext *s)
 init common structure for both encoder and decoder. More...
 
void ff_mpv_free_context_frame (MpegEncContext *s)
 Frees and resets MpegEncContext fields depending on the resolution as well as the slice thread contexts. More...
 
void ff_mpv_common_end (MpegEncContext *s)
 
void ff_clean_intra_table_entries (MpegEncContext *s)
 Clean dc, ac for the current non-intra MB. More...
 
void ff_init_block_index (MpegEncContext *s)
 
void ff_set_qscale (MpegEncContext *s, int qscale)
 set qscale and update qscale dependent variables. More...
 

Detailed Description

The simplest mpeg encoder (well, it was the simplest!).

Definition in file mpegvideo.c.

Macro Definition Documentation

◆ COPY

#define COPY (   a)    bak->a = src->a

◆ ALLOC_POOL

#define ALLOC_POOL (   name,
  size,
  flags 
)
Value:
do { \
pools->name ##_pool = ff_refstruct_pool_alloc((size), (flags)); \
if (!pools->name ##_pool) \
return AVERROR(ENOMEM); \
} while (0)

Function Documentation

◆ dct_unquantize_mpeg1_intra_c()

static void dct_unquantize_mpeg1_intra_c ( MpegEncContext s,
int16_t *  block,
int  n,
int  qscale 
)
static

Definition at line 46 of file mpegvideo.c.

Referenced by ff_mpv_idct_init().

◆ dct_unquantize_mpeg1_inter_c()

static void dct_unquantize_mpeg1_inter_c ( MpegEncContext s,
int16_t *  block,
int  n,
int  qscale 
)
static

Definition at line 75 of file mpegvideo.c.

Referenced by ff_mpv_idct_init().

◆ dct_unquantize_mpeg2_intra_c()

static void dct_unquantize_mpeg2_intra_c ( MpegEncContext s,
int16_t *  block,
int  n,
int  qscale 
)
static

Definition at line 104 of file mpegvideo.c.

Referenced by ff_mpv_idct_init().

◆ dct_unquantize_mpeg2_intra_bitexact()

static void dct_unquantize_mpeg2_intra_bitexact ( MpegEncContext s,
int16_t *  block,
int  n,
int  qscale 
)
static

Definition at line 134 of file mpegvideo.c.

Referenced by ff_mpv_idct_init().

◆ dct_unquantize_mpeg2_inter_c()

static void dct_unquantize_mpeg2_inter_c ( MpegEncContext s,
int16_t *  block,
int  n,
int  qscale 
)
static

Definition at line 168 of file mpegvideo.c.

Referenced by ff_mpv_idct_init().

◆ dct_unquantize_h263_intra_c()

static void dct_unquantize_h263_intra_c ( MpegEncContext s,
int16_t *  block,
int  n,
int  qscale 
)
static

Definition at line 202 of file mpegvideo.c.

Referenced by ff_mpv_idct_init().

◆ dct_unquantize_h263_inter_c()

static void dct_unquantize_h263_inter_c ( MpegEncContext s,
int16_t *  block,
int  n,
int  qscale 
)
static

Definition at line 236 of file mpegvideo.c.

Referenced by ff_mpv_idct_init().

◆ gray16()

static void gray16 ( uint8_t *  dst,
const uint8_t *  src,
ptrdiff_t  linesize,
int  h 
)
static

Definition at line 263 of file mpegvideo.c.

Referenced by dsp_init().

◆ gray8()

static void gray8 ( uint8_t *  dst,
const uint8_t *  src,
ptrdiff_t  linesize,
int  h 
)
static

Definition at line 269 of file mpegvideo.c.

Referenced by dsp_init().

◆ dsp_init()

static av_cold void dsp_init ( MpegEncContext s)
static

Definition at line 276 of file mpegvideo.c.

Referenced by ff_mpv_common_init().

◆ ff_init_scantable()

av_cold void ff_init_scantable ( const uint8_t *  permutation,
ScanTable st,
const uint8_t *  src_scantable 
)

◆ ff_mpv_idct_init()

av_cold void ff_mpv_idct_init ( MpegEncContext s)

◆ init_duplicate_context()

static int init_duplicate_context ( MpegEncContext s)
static

Definition at line 355 of file mpegvideo.c.

Referenced by ff_mpv_init_duplicate_contexts().

◆ ff_mpv_init_duplicate_contexts()

int ff_mpv_init_duplicate_contexts ( MpegEncContext s)

Initialize an MpegEncContext's thread contexts.

Presumes that slice_context_count is already set and that all the fields that are freed/reset in free_duplicate_context() are NULL.

Definition at line 389 of file mpegvideo.c.

Referenced by ff_mpv_common_frame_size_change(), and ff_mpv_common_init().

◆ free_duplicate_context()

static void free_duplicate_context ( MpegEncContext s)
static

Definition at line 413 of file mpegvideo.c.

Referenced by free_duplicate_contexts().

◆ free_duplicate_contexts()

static void free_duplicate_contexts ( MpegEncContext s)
static

Definition at line 432 of file mpegvideo.c.

Referenced by ff_mpv_free_context_frame().

◆ backup_duplicate_context()

static void backup_duplicate_context ( MpegEncContext bak,
MpegEncContext src 
)
static

Definition at line 441 of file mpegvideo.c.

Referenced by ff_update_duplicate_context().

◆ ff_update_duplicate_context()

int ff_update_duplicate_context ( MpegEncContext dst,
const MpegEncContext src 
)

Definition at line 462 of file mpegvideo.c.

Referenced by decode_chunks(), and encode_picture().

◆ ff_mpv_common_defaults()

void ff_mpv_common_defaults ( MpegEncContext s)

Set the given MpegEncContext to common defaults (same for encoding and decoding).

The changed fields will not depend upon the prior state of the MpegEncContext.

Definition at line 486 of file mpegvideo.c.

Referenced by ff_mpv_decode_init(), and mpv_encode_defaults().

◆ free_buffer_pools()

static void free_buffer_pools ( BufferPoolContext pools)
static

Definition at line 503 of file mpegvideo.c.

Referenced by ff_mpv_free_context_frame().

◆ ff_mpv_init_context_frame()

int ff_mpv_init_context_frame ( MpegEncContext s)

Initialize and allocates MpegEncContext fields dependent on the resolution.

Definition at line 513 of file mpegvideo.c.

Referenced by ff_mpv_common_frame_size_change(), and ff_mpv_common_init().

◆ clear_context()

static void clear_context ( MpegEncContext s)
static

Definition at line 643 of file mpegvideo.c.

Referenced by ff_mpv_common_init().

◆ ff_mpv_common_init()

av_cold int ff_mpv_common_init ( MpegEncContext s)

init common structure for both encoder and decoder.

this assumes that some variables like width/height are already set

Definition at line 690 of file mpegvideo.c.

Referenced by ff_h263_decode_frame(), ff_h263_decode_init(), ff_mpeg_update_thread_context(), ff_mpv_encode_init(), ff_rv34_decode_init(), ff_vc1_decode_init(), h261_decode_frame(), mpeg_decode_postinit(), rv20_decode_picture_header(), svq1_encode_init(), and vcr2_init_sequence().

◆ ff_mpv_free_context_frame()

void ff_mpv_free_context_frame ( MpegEncContext s)

Frees and resets MpegEncContext fields depending on the resolution as well as the slice thread contexts.

Is used during resolution changes to avoid a full reinitialization of the codec.

Definition at line 752 of file mpegvideo.c.

Referenced by ff_mpv_common_end(), and ff_mpv_common_frame_size_change().

◆ ff_mpv_common_end()

void ff_mpv_common_end ( MpegEncContext s)

◆ ff_clean_intra_table_entries()

void ff_clean_intra_table_entries ( MpegEncContext s)

Clean dc, ac for the current non-intra MB.

Definition at line 799 of file mpegvideo.c.

Referenced by encode_thread(), mpeg4_decode_partition_a(), and mpv_reconstruct_mb_internal().

◆ ff_init_block_index()

void ff_init_block_index ( MpegEncContext s)

◆ ff_set_qscale()

void ff_set_qscale ( MpegEncContext s,
int  qscale 
)
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
ff_refstruct_pool_alloc
FFRefStructPool * ff_refstruct_pool_alloc(size_t size, unsigned flags)
Equivalent to ff_refstruct_pool_alloc(size, flags, NULL, NULL, NULL, NULL, NULL)
Definition: refstruct.c:335
size
int size
Definition: twinvq_data.h:10344
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:474