Frame parsing

Граф связей класса Frame parsing:

Классы
struct	AVCodecParserContext
struct	AVCodecParser

Определения типов
typedef struct AVCodecParserContext	AVCodecParserContext
typedef struct AVCodecParser	AVCodecParser

Перечисления
enum	AVPictureStructure { AV_PICTURE_STRUCTURE_UNKNOWN, AV_PICTURE_STRUCTURE_TOP_FIELD, AV_PICTURE_STRUCTURE_BOTTOM_FIELD, AV_PICTURE_STRUCTURE_FRAME }

Функции
const AVCodecParser *	av_parser_iterate (void **opaque)
attribute_deprecated AVCodecParser *	av_parser_next (const AVCodecParser *c)
attribute_deprecated void	av_register_codec_parser (AVCodecParser *parser)
AVCodecParserContext *	av_parser_init (int codec_id)
int	av_parser_parse2 (AVCodecParserContext *s, AVCodecContext *avctx, uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size, int64_t pts, int64_t dts, int64_t pos)
int	av_parser_change (AVCodecParserContext *s, AVCodecContext *avctx, uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size, int keyframe)
void	av_parser_close (AVCodecParserContext *s)

Подробное описание

Типы

AVCodecParserContext

typedef struct AVCodecParserContext AVCodecParserContext

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavcodec/avcodec.h>

AVCodecParser

typedef struct AVCodecParser AVCodecParser

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavcodec/avcodec.h>

Перечисления

AVPictureStructure

enum AVPictureStructure

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavcodec/avcodec.h>

Элементы перечислений
AV_PICTURE_STRUCTURE_UNKNOWN
AV_PICTURE_STRUCTURE_TOP_FIELD
AV_PICTURE_STRUCTURE_BOTTOM_FIELD
AV_PICTURE_STRUCTURE_FRAME

См. определение в файле avcodec.h строка 5101

                        {
    AV_PICTURE_STRUCTURE_UNKNOWN,      //< unknown
    AV_PICTURE_STRUCTURE_TOP_FIELD,    //< coded as top field
    AV_PICTURE_STRUCTURE_BOTTOM_FIELD, //< coded as bottom field
    AV_PICTURE_STRUCTURE_FRAME,        //< coded as frame
};

Функции

av_parser_iterate()

const AVCodecParser* av_parser_iterate

(

void **

opaque

)

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavcodec/avcodec.h>

Iterate over all registered codec parsers.

Аргументы

opaque

a pointer where libavcodec will store the iteration state. Must point to NULL to start the iteration.

Возвращает

the next registered codec parser or NULL when the iteration is finished

av_parser_next()

attribute_deprecated AVCodecParser* av_parser_next

(

const AVCodecParser *

c

)

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavcodec/avcodec.h>

av_register_codec_parser()

attribute_deprecated void av_register_codec_parser

(

AVCodecParser *

parser

)

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavcodec/avcodec.h>

av_parser_init()

AVCodecParserContext* av_parser_init

(

int

codec_id

)

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavcodec/avcodec.h>

av_parser_parse2()

int av_parser_parse2	(	AVCodecParserContext *	s,
		AVCodecContext *	avctx,
		uint8_t **	poutbuf,
		int *	poutbuf_size,
		const uint8_t *	buf,
		int	buf_size,
		int64_t	pts,
		int64_t	dts,
		int64_t	pos
	)

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavcodec/avcodec.h>

Parse a packet.

Аргументы

s	parser context.
avctx	codec context.
poutbuf	set to pointer to parsed buffer or NULL if not yet finished.
poutbuf_size	set to size of parsed buffer or zero if not yet finished.
buf	input buffer.
buf_size	buffer size in bytes without the padding. I.e. the full buffer size is assumed to be buf_size + AV_INPUT_BUFFER_PADDING_SIZE. To signal EOF, this should be 0 (so that the last frame can be output).
pts	input presentation timestamp.
dts	input decoding timestamp.
pos	input byte position in stream.

Возвращает

the number of bytes of the input bitstream used.

Example:

while(in_len){
    len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
                                     in_data, in_len,
                                     pts, dts, pos);
    in_data += len;
    in_len  -= len;
 
    if(size)
       decode_frame(data, size);
}

av_parser_change()

int av_parser_change	(	AVCodecParserContext *	s,
		AVCodecContext *	avctx,
		uint8_t **	poutbuf,
		int *	poutbuf_size,
		const uint8_t *	buf,
		int	buf_size,
		int	keyframe
	)

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavcodec/avcodec.h>

Возвращает

0 if the output buffer is a subset of the input, 1 if it is allocated and must be freed

Уст.:

use AVBitStreamFilter

av_parser_close()

void av_parser_close

(

AVCodecParserContext *

s

)

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavcodec/avcodec.h>