thread.h File Reference

Multithreading support functions. More...

#include "libavutil/buffer.h"
#include "config.h"
#include "avcodec.h"

Go to the source code of this file.

Data Structures
struct	ThreadFrame

Functions
void	ff_thread_flush (AVCodecContext *avctx)
	Wait for decoding threads to finish and reset internal state.
int	ff_thread_decode_frame (AVCodecContext *avctx, AVFrame *picture, int *got_picture_ptr, AVPacket *avpkt)
	Submit a new frame to a decoding thread.
void	ff_thread_finish_setup (AVCodecContext *avctx)
	If the codec defines update_thread_context(), call this when they are ready for the next thread to start decoding the next frame.
void	ff_thread_report_progress (ThreadFrame *f, int progress, int field)
	Notify later decoding threads when part of their reference picture is ready.
void	ff_thread_await_progress (ThreadFrame *f, int progress, int field)
	Wait for earlier decoding threads to finish reference pictures.
enum AVPixelFormat	ff_thread_get_format (AVCodecContext *avctx, const enum AVPixelFormat *fmt)
	Wrapper around get_format() for frame-multithreaded codecs.
int	ff_thread_get_buffer (AVCodecContext *avctx, ThreadFrame *f, int flags)
	Wrapper around get_buffer() for frame-multithreaded codecs.
void	ff_thread_release_buffer (AVCodecContext *avctx, ThreadFrame *f)
	Wrapper around release_buffer() frame-for multithreaded codecs.
int	ff_thread_ref_frame (ThreadFrame *dst, ThreadFrame *src)
int	ff_thread_init (AVCodecContext *s)
void	ff_thread_free (AVCodecContext *s)

Detailed Description

Multithreading support functions.

Author

Alexander Strange astra.nosp@m.nge@.nosp@m.ithin.nosp@m.ksw..nosp@m.com

Definition in file thread.h.

Function Documentation

void ff_thread_flush

(

AVCodecContext *

avctx

)

Wait for decoding threads to finish and reset internal state.

Called by avcodec_flush_buffers().

Parameters

avctx

The context.

Definition at line 881 of file pthread.c.

Referenced by avcodec_flush_buffers().

int ff_thread_decode_frame	(	AVCodecContext *	avctx,
		AVFrame *	picture,
		int *	got_picture_ptr,
		AVPacket *	avpkt
	)

Submit a new frame to a decoding thread.

Returns the next available frame in picture. *got_picture_ptr will be 0 if none is available. The return value on success is the size of the consumed packet for compatibility with avcodec_decode_video2(). This means the decoder has to consume the full packet.

Parameters are the same as avcodec_decode_video2().

Definition at line 581 of file pthread.c.

Referenced by avcodec_decode_audio4(), and avcodec_decode_video2().

void ff_thread_finish_setup

(

AVCodecContext *

avctx

)

If the codec defines update_thread_context(), call this when they are ready for the next thread to start decoding the next frame.

After calling it, do not change any variables read by the update_thread_context() method, or call ff_thread_get_buffer().

Parameters

avctx

The context.

Definition at line 691 of file pthread.c.

Referenced by decode_frame(), decode_postinit(), ff_h263_decode_frame(), ff_rv34_decode_frame(), frame_worker_thread(), mimic_decode_frame(), mpeg_field_start(), tak_decode_frame(), thread_get_buffer_internal(), and vp8_decode_frame().

void ff_thread_report_progress	(	ThreadFrame *	f,
		int	progress,
		int	field
	)

Notify later decoding threads when part of their reference picture is ready.

Call this when some part of the picture is finished decoding. Later calls with lower values of progress have no effect.

Parameters

f	The picture being decoded.
progress	Value, in arbitrary units, of how much of the picture has decoded.
field	The field being decoded, for field-picture codecs. 0 for top field or frame pictures, 1 for bottom field.

Definition at line 655 of file pthread.c.

Referenced by decode(), decode_finish_row(), decode_frame(), decode_nal_units(), decode_slice_header(), ff_MPV_frame_end(), ff_MPV_frame_start(), ff_MPV_report_decode_progress(), ff_rv34_decode_frame(), field_end(), finish_frame(), mimic_decode_frame(), rv34_decode_slice(), vp3_draw_horiz_band(), vp8_decode_frame(), and vp8_decode_mb_row_sliced().

void ff_thread_await_progress	(	ThreadFrame *	f,
		int	progress,
		int	field
	)

Wait for earlier decoding threads to finish reference pictures.

Call this before accessing some part of a picture, with a given value for progress, and it will return after the responsible decoding thread calls ff_thread_report_progress() with the same or higher value for progress.

Parameters

f	The picture being referenced.
progress	Value, in arbitrary units, to wait for.
field	The field being referenced, for field-picture codecs. 0 for top field or frame pictures, 1 for bottom field.

Definition at line 673 of file pthread.c.

Referenced by await_reference_mb_row(), await_reference_row(), await_references(), decode(), decode_frame(), decode_slice(), ff_er_frame_end(), guess_mv(), is_intra_more_likely(), mpeg4_decode_mb(), MPV_decode_mb_internal(), rv34_decode_mv(), rv34_mc(), vp8_decode_frame(), vp8_decode_mb_row_no_filter(), vp8_mc_chroma(), and vp8_mc_luma().

enum AVPixelFormat ff_thread_get_format	(	AVCodecContext *	avctx,
		const enum AVPixelFormat *	fmt
	)

Wrapper around get_format() for frame-multithreaded codecs.

Call this function instead of avctx->get_format(). Cannot be called after the codec has called ff_thread_finish_setup().

Parameters

avctx	The current context.
fmt	The list of available formats.

Definition at line 982 of file pthread.c.

Referenced by get_pixel_format(), and mpeg_get_pixelformat().

int ff_thread_get_buffer	(	AVCodecContext *	avctx,
		ThreadFrame *	f,
		int	flags
	)

Wrapper around get_buffer() for frame-multithreaded codecs.

Call this function instead of ff_get_buffer(f). Cannot be called after the codec has called ff_thread_finish_setup().

Parameters

avctx	The current context.
f	The frame to write into.

Definition at line 1008 of file pthread.c.

Referenced by alloc_frame_buffer(), alloc_picture(), decode_element(), decode_frame(), dnxhd_decode_frame(), flac_decode_frame(), jpeg2000_decode_frame(), lag_decode_frame(), libopenjpeg_decode_frame(), mimic_decode_frame(), tak_decode_frame(), tta_decode_frame(), vp8_alloc_frame(), and wavpack_decode_block().

void ff_thread_release_buffer	(	AVCodecContext *	avctx,
		ThreadFrame *	f
	)

Wrapper around release_buffer() frame-for multithreaded codecs.

Call this function instead of avctx->release_buffer(f). The AVFrame will be copied and the actual release_buffer() call will be performed later. The contents of data pointed to by the AVFrame should not be changed until ff_thread_get_buffer() is called on it.

Parameters

avctx	The current context.
f	The picture being released.

Definition at line 1016 of file pthread.c.

Referenced by decode_frame(), ff_mpeg_unref_picture(), ff_thread_ref_frame(), ffv1_close(), mimic_decode_end(), mimic_decode_frame(), mimic_decode_update_thread_context(), ref_frame(), unref_picture(), update_frames(), update_thread_context(), vp3_decode_flush(), vp8_alloc_frame(), and vp8_release_frame().

int ff_thread_ref_frame	(	ThreadFrame *	dst,
		ThreadFrame *	src
	)

Definition at line 3095 of file utils.c.

Referenced by ff_mpeg_ref_picture(), mimic_decode_update_thread_context(), ref_frame(), ref_picture(), update_frames(), update_thread_context(), and vp8_ref_frame().

int ff_thread_init

(

AVCodecContext *

s

)

Definition at line 1097 of file pthread.c.

Referenced by avcodec_open2().

void ff_thread_free

(

AVCodecContext *

s

)

Definition at line 1113 of file pthread.c.

Referenced by avcodec_close(), and avcodec_thread_init().