libavcodec/pthread.c File Reference

Multithreading support functions. More...

#include "config.h"
#include "avcodec.h"
#include "internal.h"
#include "thread.h"

Go to the source code of this file.

Data Structures
struct	ThreadContext
struct	PerThreadContext
	Context used by codec threads and stored in their AVCodecContext thread_opaque. More...
struct	FrameThreadContext
	Context stored in the client AVCodecContext thread_opaque. More...
Defines
#define	MAX_BUFFERS   (32+1)
	Max number of frame buffers that can be allocated when using frame threads.
#define	MAX_AUTO_THREADS   16
#define	copy_fields(s, e)   memcpy(&dst->s, &src->s, (char*)&dst->e - (char*)&dst->s);
Typedefs
typedef int(	action_func )(AVCodecContext *c, void *arg)
typedef int(	action_func2 )(AVCodecContext *c, void *arg, int jobnr, int threadnr)
Functions
static int	get_logical_cpus (AVCodecContext *avctx)
static void *attribute_align_arg	worker (void *v)
static av_always_inline void	avcodec_thread_park_workers (ThreadContext *c, int thread_count)
static void	thread_free (AVCodecContext *avctx)
static int	avcodec_thread_execute (AVCodecContext *avctx, action_func *func, void *arg, int *ret, int job_count, int job_size)
static int	avcodec_thread_execute2 (AVCodecContext *avctx, action_func2 *func2, void *arg, int *ret, int job_count)
static int	thread_init (AVCodecContext *avctx)
static attribute_align_arg void *	frame_worker_thread (void *arg)
	Codec worker thread.
static int	update_context_from_thread (AVCodecContext *dst, AVCodecContext *src, int for_user)
	Update the next thread's AVCodecContext with values from the reference thread's context.
static int	update_context_from_user (AVCodecContext *dst, AVCodecContext *src)
	Update the next thread's AVCodecContext with values set by the user.
static void	free_progress (AVFrame *f)
static void	release_delayed_buffers (PerThreadContext *p)
	Releases the buffers that this decoding thread was the last user of.
static int	submit_packet (PerThreadContext *p, AVPacket *avpkt)
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_report_progress (AVFrame *f, int n, int field)
	Notify later decoding threads when part of their reference picture is ready.
void	ff_thread_await_progress (AVFrame *f, int n, int field)
	Wait for earlier decoding threads to finish reference pictures.
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.
static void	park_frame_worker_threads (FrameThreadContext *fctx, int thread_count)
	Waits for all threads to finish.
static void	frame_thread_free (AVCodecContext *avctx, int thread_count)
static int	frame_thread_init (AVCodecContext *avctx)
void	ff_thread_flush (AVCodecContext *avctx)
	Wait for decoding threads to finish and reset internal state.
static int *	allocate_progress (PerThreadContext *p)
int	ff_thread_get_buffer (AVCodecContext *avctx, AVFrame *f)
	Wrapper around get_buffer() for frame-multithreaded codecs.
void	ff_thread_release_buffer (AVCodecContext *avctx, AVFrame *f)
	Wrapper around release_buffer() frame-for multithreaded codecs.
static void	validate_thread_parameters (AVCodecContext *avctx)
	Set the threading algorithms used.
int	ff_thread_init (AVCodecContext *avctx)
void	ff_thread_free (AVCodecContext *avctx)

---

Detailed Description

Multithreading support functions.

See also:

doc/multithreading.txt

Definition in file pthread.c.

---

Define Documentation

#define copy_fields	(	s,
		e		)	memcpy(&dst->s, &src->s, (char*)&dst->e - (char*)&dst->s);

#define MAX_AUTO_THREADS   16

Definition at line 162 of file pthread.c.

Referenced by frame_thread_init(), and thread_init().

#define MAX_BUFFERS   (32+1)

Max number of frame buffers that can be allocated when using frame threads.

Definition at line 87 of file pthread.c.

Referenced by allocate_progress(), ff_thread_release_buffer(), and frame_worker_thread().

---

Typedef Documentation

typedef int( action_func)(AVCodecContext *c, void *arg)

Definition at line 65 of file pthread.c.

typedef int( action_func2)(AVCodecContext *c, void *arg, int jobnr, int threadnr)

Definition at line 66 of file pthread.c.

---

Function Documentation

static int* allocate_progress

(

PerThreadContext *

p

)

[static]

Definition at line 921 of file pthread.c.

Referenced by ff_thread_get_buffer().

static int avcodec_thread_execute	(	AVCodecContext *	avctx,
		action_func *	func,
		void *	arg,
		int *	ret,
		int	job_count,
		int	job_size
	)			[static]

Definition at line 265 of file pthread.c.

Referenced by avcodec_thread_execute2(), and thread_init().

static int avcodec_thread_execute2	(	AVCodecContext *	avctx,
		action_func2 *	func2,
		void *	arg,
		int *	ret,
		int	job_count
	)			[static]

Definition at line 298 of file pthread.c.

Referenced by thread_init().

static av_always_inline void avcodec_thread_park_workers	(	ThreadContext *	c,
		int	thread_count
	)			[static]

Definition at line 238 of file pthread.c.

Referenced by avcodec_thread_execute(), and thread_init().

void ff_thread_await_progress	(	AVFrame *	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 700 of file pthread.c.

Referenced by await_reference_mb_row(), await_reference_row(), await_references(), decode(), 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_mc_chroma(), and vp8_mc_luma().

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 compatiblity 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 606 of file pthread.c.

Referenced by 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 718 of file pthread.c.

Referenced by decode_frame(), decode_postinit(), dnxhd_decode_frame(), ff_h263_decode_frame(), ff_rv34_decode_frame(), ff_thread_get_buffer(), frame_worker_thread(), mimic_decode_frame(), mpeg_field_start(), and vp8_decode_frame().

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 902 of file pthread.c.

Referenced by avcodec_flush_buffers().

void ff_thread_free

(

AVCodecContext *

avctx

)

Definition at line 1071 of file pthread.c.

Referenced by avcodec_close(), and thread_init().

int ff_thread_get_buffer	(	AVCodecContext *	avctx,
		AVFrame *	f
	)

Wrapper around get_buffer() for frame-multithreaded codecs.

Call this function instead of avctx->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 938 of file pthread.c.

Referenced by alloc_frame_buffer(), decode_frame(), dnxhd_decode_frame(), libopenjpeg_decode_frame(), mimic_decode_frame(), and vp8_alloc_frame().

int ff_thread_init

(

AVCodecContext *

avctx

)

Definition at line 1048 of file pthread.c.

Referenced by avcodec_open2(), and avcodec_thread_init().

void ff_thread_release_buffer	(	AVCodecContext *	avctx,
		AVFrame *	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 995 of file pthread.c.

Referenced by decode_end(), decode_frame(), dnxhd_decode_close(), dnxhd_decode_frame(), free_frame_buffer(), libopenjpeg_decode_close(), libopenjpeg_decode_frame(), mimic_decode_end(), mimic_decode_frame(), update_frames(), vp3_decode_flush(), vp8_alloc_frame(), and vp8_release_frame().

void ff_thread_report_progress	(	AVFrame *	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 682 of file pthread.c.

Referenced by decode(), decode_finish_row(), decode_nal_units(), decode_slice_header(), ff_rv34_decode_frame(), field_end(), finish_frame(), mimic_decode_frame(), MPV_frame_end(), MPV_frame_start(), MPV_report_decode_progress(), rv34_decode_slice(), vp3_draw_horiz_band(), and vp8_decode_frame().

static void frame_thread_free	(	AVCodecContext *	avctx,
		int	thread_count
	)			[static]

Definition at line 751 of file pthread.c.

Referenced by ff_thread_free(), and frame_thread_init().

static int frame_thread_init

(

AVCodecContext *

avctx

)

[static]

Definition at line 809 of file pthread.c.

Referenced by ff_thread_init().

static attribute_align_arg void* frame_worker_thread

(

void *

arg

)

[static]

Codec worker thread.

Automatically calls ff_thread_finish_setup() if the codec does not provide an update_thread_context method, or if the codec returns before calling it.

Definition at line 367 of file pthread.c.

Referenced by frame_thread_init().

static void free_progress

(

AVFrame *

f

)

[static]

Definition at line 513 of file pthread.c.

Referenced by release_delayed_buffers().

static int get_logical_cpus

(

AVCodecContext *

avctx

)

[static]

Definition at line 164 of file pthread.c.

Referenced by frame_thread_init(), and thread_init().

static void park_frame_worker_threads	(	FrameThreadContext *	fctx,
		int	thread_count
	)			[static]

Waits for all threads to finish.

Definition at line 734 of file pthread.c.

Referenced by ff_thread_flush(), and frame_thread_free().

static void release_delayed_buffers

(

PerThreadContext *

p

)

[static]

Releases the buffers that this decoding thread was the last user of.

Definition at line 522 of file pthread.c.

Referenced by frame_thread_free(), and submit_packet().

static int submit_packet	(	PerThreadContext *	p,
		AVPacket *	avpkt
	)			[static]

Definition at line 539 of file pthread.c.

Referenced by ff_thread_decode_frame().

static void thread_free

(

AVCodecContext *

avctx

)

[static]

Definition at line 245 of file pthread.c.

Referenced by ff_thread_free().

static int thread_init

(

AVCodecContext *

avctx

)

[static]

Definition at line 305 of file pthread.c.

Referenced by ff_thread_init().

static int update_context_from_thread	(	AVCodecContext *	dst,
		AVCodecContext *	src,
		int	for_user
	)			[static]

Update the next thread's AVCodecContext with values from the reference thread's context.

Parameters:

	dst	The destination context.
	src	The source context.
	for_user	0 if the destination is a codec thread, 1 if the destination is the user's thread

Definition at line 420 of file pthread.c.

Referenced by ff_thread_decode_frame(), ff_thread_flush(), frame_thread_free(), frame_thread_init(), and submit_packet().

static int update_context_from_user	(	AVCodecContext *	dst,
		AVCodecContext *	src
	)			[static]

Update the next thread's AVCodecContext with values set by the user.

Parameters:

	dst	The destination context.
	src	The source context.

Returns:

0 on success, negative error code on failure

Definition at line 472 of file pthread.c.

Referenced by ff_thread_decode_frame().

static void validate_thread_parameters

(

AVCodecContext *

avctx

)

[static]

Set the threading algorithms used.

Threading requires more than one thread. Frame threading requires entire frames to be passed to the codec, and introduces extra decoding delay, so is incompatible with low_delay.

Parameters:

avctx

The context.

Definition at line 1029 of file pthread.c.

Referenced by ff_thread_init().

static void* attribute_align_arg worker

(

void *

v

)

[static]

Definition at line 202 of file pthread.c.

Referenced by thread_init().