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Data Fields
AVHWAccel Struct Reference

#include <avcodec.h>

Data Fields

const char * name
 Name of the hardware accelerated codec.
 
enum AVMediaType type
 Type of codec implemented by the hardware accelerator.
 
enum AVCodecID id
 Codec implemented by the hardware accelerator.
 
enum AVPixelFormat pix_fmt
 Supported pixel format.
 
int capabilities
 Hardware accelerated codec capabilities.
 
struct AVHWAccelnext
 
int(* alloc_frame )(AVCodecContext *avctx, AVFrame *frame)
 Allocate a custom buffer.
 
int(* start_frame )(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size)
 Called at the beginning of each frame or field picture.
 
int(* decode_slice )(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size)
 Callback for each slice.
 
int(* end_frame )(AVCodecContext *avctx)
 Called at the end of each frame or field picture.
 
int frame_priv_data_size
 Size of per-frame hardware accelerator private data.
 
void(* decode_mb )(struct MpegEncContext *s)
 Called for every Macroblock in a slice.
 
int(* init )(AVCodecContext *avctx)
 Initialize the hwaccel private data.
 
int(* uninit )(AVCodecContext *avctx)
 Uninitialize the hwaccel private data.
 
int priv_data_size
 Size of the private data to allocate in AVCodecInternal.hwaccel_priv_data.
 

Detailed Description

Definition at line 3255 of file avcodec.h.

Field Documentation

const char* AVHWAccel::name

Name of the hardware accelerated codec.

The name is globally unique among encoders and among decoders (but an encoder and a decoder can share the same name).

Definition at line 3261 of file avcodec.h.

enum AVMediaType AVHWAccel::type

Type of codec implemented by the hardware accelerator.

See AVMEDIA_TYPE_xxx

Definition at line 3268 of file avcodec.h.

enum AVCodecID AVHWAccel::id

Codec implemented by the hardware accelerator.

See AV_CODEC_ID_xxx

Definition at line 3275 of file avcodec.h.

Referenced by find_hwaccel().

enum AVPixelFormat AVHWAccel::pix_fmt

Supported pixel format.

Only hardware accelerated formats are supported here.

Definition at line 3282 of file avcodec.h.

Referenced by find_hwaccel().

int AVHWAccel::capabilities

Hardware accelerated codec capabilities.

see FF_HWACCEL_CODEC_CAP_*

Definition at line 3288 of file avcodec.h.

struct AVHWAccel* AVHWAccel::next

Definition at line 3297 of file avcodec.h.

Referenced by av_hwaccel_next(), and av_register_hwaccel().

int(* AVHWAccel::alloc_frame)(AVCodecContext *avctx, AVFrame *frame)

Allocate a custom buffer.

Definition at line 3302 of file avcodec.h.

Referenced by get_buffer_internal().

int(* AVHWAccel::start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size)

Called at the beginning of each frame or field picture.

Meaningful frame information (codec specific) is guaranteed to be parsed at this point. This function is mandatory.

Note that buf can be NULL along with buf_size set to 0. Otherwise, this means the whole frame is available at this point.

Parameters
avctxthe codec context
bufthe frame data buffer base
buf_sizethe size of the frame in bytes
Returns
zero if successful, a negative value otherwise

Definition at line 3318 of file avcodec.h.

Referenced by decode_nal_units(), ff_h263_decode_frame(), mpeg_field_start(), and vc1_decode_frame().

int(* AVHWAccel::decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size)

Callback for each slice.

Meaningful slice information (codec specific) is guaranteed to be parsed at this point. This function is mandatory. The only exception is XvMC, that works on MB level.

Parameters
avctxthe codec context
bufthe slice data buffer base
buf_sizethe size of the slice in bytes
Returns
zero if successful, a negative value otherwise

Definition at line 3332 of file avcodec.h.

Referenced by decode_nal_units(), decode_slice(), er_supported(), ff_er_add_slice(), mpeg_decode_slice(), and vc1_decode_frame().

int(* AVHWAccel::end_frame)(AVCodecContext *avctx)

Called at the end of each frame or field picture.

The whole picture is parsed at this point and can now be sent to the hardware accelerator. This function is mandatory.

Parameters
avctxthe codec context
Returns
zero if successful, a negative value otherwise

Definition at line 3343 of file avcodec.h.

Referenced by ff_h263_decode_frame(), ff_h264_field_end(), mpeg_field_start(), slice_end(), and vc1_decode_frame().

int AVHWAccel::frame_priv_data_size

Size of per-frame hardware accelerator private data.

Private data is allocated with av_mallocz() before AVCodecContext.get_buffer() and deallocated after AVCodecContext.release_buffer().

Definition at line 3352 of file avcodec.h.

Referenced by alloc_frame_buffer(), and alloc_picture().

void(* AVHWAccel::decode_mb)(struct MpegEncContext *s)

Called for every Macroblock in a slice.

XvMC uses it to replace the ff_mpv_decode_mb(). Instead of decoding to raw picture, MB parameters are stored in an array provided by the video driver.

Parameters
sthe mpeg context

Definition at line 3363 of file avcodec.h.

Referenced by ff_blockdsp_init_x86(), ff_er_frame_end(), is_intra_more_likely(), and mpv_decode_mb_internal().

int(* AVHWAccel::init)(AVCodecContext *avctx)

Initialize the hwaccel private data.

This will be called from ff_get_format(), after hwaccel and hwaccel_context are set and the hwaccel private data in AVCodecInternal is allocated.

Definition at line 3372 of file avcodec.h.

Referenced by ff_vdpau_common_reinit(), and setup_hwaccel().

int(* AVHWAccel::uninit)(AVCodecContext *avctx)

Uninitialize the hwaccel private data.

This will be called from get_format() or avcodec_close(), after hwaccel and hwaccel_context are already uninitialized.

Definition at line 3380 of file avcodec.h.

Referenced by avcodec_close(), ff_get_format(), and ff_vdpau_common_reinit().

int AVHWAccel::priv_data_size

Size of the private data to allocate in AVCodecInternal.hwaccel_priv_data.

Definition at line 3386 of file avcodec.h.

Referenced by setup_hwaccel().


The documentation for this struct was generated from the following file: