FFmpeg: Frame parsing

FFmpeg

Data Structures | Enumerations | Functions

Frame parsing

Data Structures

struct AVCodecParserContext

struct AVCodecParser

Enumerations

enum AVPictureStructure { AV_PICTURE_STRUCTURE_UNKNOWN, AV_PICTURE_STRUCTURE_TOP_FIELD, AV_PICTURE_STRUCTURE_BOTTOM_FIELD, AV_PICTURE_STRUCTURE_FRAME }

Functions

const AVCodecParser * av_parser_iterate (void **opaque)

Iterate over all registered codec parsers. More...

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)

Parse a packet. More...

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)

Detailed Description

Enumeration Type Documentation

enum AVPictureStructure

Enumerator
AV_PICTURE_STRUCTURE_UNKNOWN
AV_PICTURE_STRUCTURE_TOP_FIELD
AV_PICTURE_STRUCTURE_BOTTOM_FIELD
AV_PICTURE_STRUCTURE_FRAME

Definition at line 5025 of file avcodec.h.

Function Documentation

const AVCodecParser* av_parser_iterate ( void ** opaque )

Iterate over all registered codec parsers.

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

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

Definition at line 103 of file parser.c.

Referenced by av_parser_init().

attribute_deprecated AVCodecParser* av_parser_next ( const AVCodecParser * c )

Definition at line 93 of file parser.c.

attribute_deprecated void av_register_codec_parser ( AVCodecParser * parser )

Definition at line 114 of file parser.c.

AVCodecParserContext* av_parser_init ( int codec_id )

Examples:: decode_audio.c, and decode_video.c.

Definition at line 119 of file parser.c.

Referenced by avformat_find_stream_info(), ff_qsv_process_data(), flac_read_timestamp(), main(), old_flac_header(), read_frame_internal(), and remove_extradata_init().

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

)

Parse a packet.

Parameters: 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.

Returns: 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);

}

Examples:: decode_audio.c, and decode_video.c.

Definition at line 205 of file parser.c.

Referenced by ff_qsv_process_data(), flac_read_timestamp(), main(), old_flac_header(), and parse_packet().

int av_parser_change ( AVCodecParserContext * s,

AVCodecContext * avctx,

uint8_t ** poutbuf,

int * poutbuf_size,

const uint8_t * buf,

int buf_size,

int keyframe

)

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

Deprecated:: use AVBitStreamFilter

Definition at line 274 of file parser.c.

void av_parser_close ( AVCodecParserContext * s )

Examples:: decode_audio.c, and decode_video.c.

Definition at line 309 of file parser.c.

Referenced by estimate_timings_from_pts(), ff_qsv_decode_close(), ff_read_frame_flush(), flac_read_timestamp(), free_stream(), main(), old_flac_header(), read_frame_internal(), remove_extradata_close(), and update_stream_avctx().

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