FFmpeg
Macros | Functions
mpegpicture.c File Reference
#include <stdint.h>
#include "libavutil/avassert.h"
#include "libavutil/common.h"
#include "libavutil/pixdesc.h"
#include "libavutil/imgutils.h"
#include "avcodec.h"
#include "motion_est.h"
#include "mpegpicture.h"
#include "mpegutils.h"

Go to the source code of this file.

Macros

#define MAKE_WRITABLE(table)
 
#define EMU_EDGE_HEIGHT   (4 * 70)
 
#define UPDATE_TABLE(table)
 

Functions

static int make_tables_writable (Picture *pic)
 
int ff_mpeg_framesize_alloc (AVCodecContext *avctx, MotionEstContext *me, ScratchpadContext *sc, int linesize)
 
static int alloc_frame_buffer (AVCodecContext *avctx, Picture *pic, MotionEstContext *me, ScratchpadContext *sc, int chroma_x_shift, int chroma_y_shift, int linesize, int uvlinesize)
 Allocate a frame buffer. More...
 
static int alloc_picture_tables (AVCodecContext *avctx, Picture *pic, int encoding, int out_format, int mb_stride, int mb_width, int mb_height, int b8_stride)
 
int ff_alloc_picture (AVCodecContext *avctx, Picture *pic, MotionEstContext *me, ScratchpadContext *sc, int shared, int encoding, int chroma_x_shift, int chroma_y_shift, int out_format, int mb_stride, int mb_width, int mb_height, int b8_stride, ptrdiff_t *linesize, ptrdiff_t *uvlinesize)
 Allocate a Picture. More...
 
void ff_mpeg_unref_picture (AVCodecContext *avctx, Picture *pic)
 Deallocate a picture. More...
 
int ff_update_picture_tables (Picture *dst, Picture *src)
 
int ff_mpeg_ref_picture (AVCodecContext *avctx, Picture *dst, Picture *src)
 
static int pic_is_unused (Picture *pic)
 
static int find_unused_picture (AVCodecContext *avctx, Picture *picture, int shared)
 
int ff_find_unused_picture (AVCodecContext *avctx, Picture *picture, int shared)
 
void ff_free_picture_tables (Picture *pic)
 

Macro Definition Documentation

◆ MAKE_WRITABLE

#define MAKE_WRITABLE (   table)
Value:
do {\
if (pic->table &&\
(ret = av_buffer_make_writable(&pic->table)) < 0)\
return ret;\
} while (0)

◆ EMU_EDGE_HEIGHT

#define EMU_EDGE_HEIGHT   (4 * 70)

◆ UPDATE_TABLE

#define UPDATE_TABLE (   table)
Value:
do { \
if (src->table && \
(!dst->table || dst->table->buffer != src->table->buffer)) { \
av_buffer_unref(&dst->table); \
dst->table = av_buffer_ref(src->table); \
if (!dst->table) { \
ff_free_picture_tables(dst); \
return AVERROR(ENOMEM); \
} \
} \
} while (0)

Function Documentation

◆ make_tables_writable()

static int make_tables_writable ( Picture *  pic)
static

Definition at line 33 of file mpegpicture.c.

Referenced by ff_alloc_picture().

◆ ff_mpeg_framesize_alloc()

int ff_mpeg_framesize_alloc ( AVCodecContext *  avctx,
MotionEstContext *  me,
ScratchpadContext *  sc,
int  linesize 
)

Definition at line 58 of file mpegpicture.c.

Referenced by alloc_frame_buffer(), ff_mpeg_update_thread_context(), and ff_update_duplicate_context().

◆ alloc_frame_buffer()

static int alloc_frame_buffer ( AVCodecContext *  avctx,
Picture *  pic,
MotionEstContext *  me,
ScratchpadContext *  sc,
int  chroma_x_shift,
int  chroma_y_shift,
int  linesize,
int  uvlinesize 
)
static

Allocate a frame buffer.

Definition at line 100 of file mpegpicture.c.

Referenced by ff_alloc_picture().

◆ alloc_picture_tables()

static int alloc_picture_tables ( AVCodecContext *  avctx,
Picture *  pic,
int  encoding,
int  out_format,
int  mb_stride,
int  mb_width,
int  mb_height,
int  b8_stride 
)
static

Definition at line 186 of file mpegpicture.c.

Referenced by ff_alloc_picture().

◆ ff_alloc_picture()

int ff_alloc_picture ( AVCodecContext *  avctx,
Picture *  pic,
MotionEstContext *  me,
ScratchpadContext *  sc,
int  shared,
int  encoding,
int  chroma_x_shift,
int  chroma_y_shift,
int  out_format,
int  mb_stride,
int  mb_width,
int  mb_height,
int  b8_stride,
ptrdiff_t *  linesize,
ptrdiff_t *  uvlinesize 
)

Allocate a Picture.

The pixels are allocated/set by calling get_buffer() if shared = 0

Definition at line 236 of file mpegpicture.c.

Referenced by alloc_picture().

◆ ff_mpeg_unref_picture()

void ff_mpeg_unref_picture ( AVCodecContext *  avctx,
Picture *  pic 
)

Deallocate a picture.

Definition at line 299 of file mpegpicture.c.

Referenced by alloc_frame_buffer(), ff_alloc_picture(), ff_find_unused_picture(), ff_mpeg_flush(), ff_mpeg_ref_picture(), ff_mpeg_update_thread_context(), ff_mpv_common_end(), ff_mpv_encode_end(), ff_mpv_encode_picture(), ff_mpv_frame_start(), frame_start(), and select_input_picture().

◆ ff_update_picture_tables()

int ff_update_picture_tables ( Picture *  dst,
Picture *  src 
)

Definition at line 321 of file mpegpicture.c.

Referenced by ff_mpeg_ref_picture().

◆ ff_mpeg_ref_picture()

int ff_mpeg_ref_picture ( AVCodecContext *  avctx,
Picture *  dst,
Picture *  src 
)

Definition at line 366 of file mpegpicture.c.

Referenced by ff_mpeg_update_thread_context(), ff_mpv_frame_start(), frame_start(), and select_input_picture().

◆ pic_is_unused()

static int pic_is_unused ( Picture *  pic)
inlinestatic

Definition at line 409 of file mpegpicture.c.

Referenced by find_unused_picture().

◆ find_unused_picture()

static int find_unused_picture ( AVCodecContext *  avctx,
Picture *  picture,
int  shared 
)
static

Definition at line 418 of file mpegpicture.c.

Referenced by ff_find_unused_picture().

◆ ff_find_unused_picture()

int ff_find_unused_picture ( AVCodecContext *  avctx,
Picture *  picture,
int  shared 
)

Definition at line 451 of file mpegpicture.c.

Referenced by ff_h263_decode_frame(), ff_mpv_frame_start(), load_input_picture(), and select_input_picture().

◆ ff_free_picture_tables()

void ff_free_picture_tables ( Picture *  pic)

Definition at line 465 of file mpegpicture.c.

Referenced by ff_alloc_picture(), ff_find_unused_picture(), ff_mpeg_unref_picture(), ff_mpv_common_end(), and ff_mpv_encode_end().

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
src
#define src
Definition: vp8dsp.c:254
av_buffer_make_writable
int av_buffer_make_writable(AVBufferRef **pbuf)
Create a writable reference from a given buffer reference, avoiding data copy if possible.
Definition: buffer.c:151
ret
ret
Definition: filter_design.txt:187
av_buffer_ref
AVBufferRef * av_buffer_ref(AVBufferRef *buf)
Create a new reference to an AVBuffer.
Definition: buffer.c:93
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