libavcodec/libxvidff.c File Reference

Interface to xvidcore for MPEG-4 compliant encoding. More...

#include <xvid.h>
#include <unistd.h>
#include "avcodec.h"
#include "libavutil/intreadwrite.h"
#include "libxvid_internal.h"

Go to the source code of this file.

Data Structures

struct xvid_context

Structure for the private Xvid context. More...

struct xvid_ff_pass1

Structure for the private first-pass plugin. More...

Defines

#define BUFFER_SIZE   1024

Buffer management macros.

#define BUFFER_REMAINING(x)   (BUFFER_SIZE - strlen(x))

#define BUFFER_CAT(x)   (&((x)[strlen(x)]))

Functions

int has_altivec (void)

This function MAY rely on signal() or fork() in order to make sure AltiVec is present.

int xvid_strip_vol_header (AVCodecContext *avctx, unsigned char *frame, unsigned int header_len, unsigned int frame_len)

Routine to create a global VO/VOL header for MP4 container.

int xvid_ff_2pass (void *ref, int cmd, void *p1, void *p2)

Dispatch function for our custom plugin.

void xvid_correct_framerate (AVCodecContext *avctx)

Routine to correct a possibly erroneous framerate being fed to us.

static av_cold int xvid_encode_init (AVCodecContext *avctx)

Creates the private context for the encoder.

static int xvid_encode_frame (AVCodecContext *avctx, unsigned char *frame, int buf_size, void *data)

Encodes a single frame.

static av_cold int xvid_encode_close (AVCodecContext *avctx)

Destroys the private context for the encoder.

static int xvid_ff_2pass_create (xvid_plg_create_t *param, void **handle)

Initializes the two-pass plugin and context.

static int xvid_ff_2pass_destroy (struct xvid_context *ref, xvid_plg_destroy_t *param)

Destroys the two-pass plugin context.

static int xvid_ff_2pass_before (struct xvid_context *ref, xvid_plg_data_t *param)

Enables fast encode mode during the first pass.

static int xvid_ff_2pass_after (struct xvid_context *ref, xvid_plg_data_t *param)

Captures statistic data and writes it during first pass.

Variables

AVCodec libxvid_encoder

Xvid codec definition for libavcodec.

Detailed Description

Interface to xvidcore for MPEG-4 compliant encoding.

Author:: Adam Thayer (krevnik@comcast.net)

Definition in file libxvidff.c.

Define Documentation

#define BUFFER_CAT ( x ) (&((x)[strlen(x)]))

Definition at line 39 of file libxvidff.c.

Referenced by xvid_ff_2pass_after(), and xvid_ff_2pass_create().

#define BUFFER_REMAINING ( x ) (BUFFER_SIZE - strlen(x))

Definition at line 38 of file libxvidff.c.

Referenced by xvid_ff_2pass_after(), and xvid_ff_2pass_create().

#define BUFFER_SIZE 1024

Buffer management macros.

Definition at line 37 of file libxvidff.c.

Function Documentation

int has_altivec ( void )

This function MAY rely on signal() or fork() in order to make sure AltiVec is present.

Definition at line 46 of file check_altivec.c.

Referenced by dsputil_h264_init_ppc(), dsputil_init_ppc(), ff_h264dsp_init_ppc(), mm_support(), and xvid_encode_init().

void xvid_correct_framerate ( AVCodecContext * avctx )

Routine to correct a possibly erroneous framerate being fed to us.

Xvid currently chokes on framerates where the ticks per frame is extremely large. This function works to correct problems in this area by estimating a new framerate and taking the simpler fraction of the two presented.

Parameters:

avctx

Context that contains the framerate to correct.

Definition at line 552 of file libxvidff.c.

Referenced by xvid_encode_init().

static av_cold int xvid_encode_close ( AVCodecContext * avctx ) [static]

Destroys the private context for the encoder.

All buffers are freed, and the Xvid encoder context is destroyed.

Parameters:

avctx

AVCodecContext pointer to context

Returns:: Returns 0, success guaranteed

Definition at line 478 of file libxvidff.c.

static int xvid_encode_frame	(	AVCodecContext *	avctx,
		unsigned char *	frame,
		int	buf_size,
		void *	data
	)			`[static]`

Encodes a single frame.

Parameters:

	avctx	AVCodecContext pointer to context
	frame	Pointer to encoded frame buffer
	buf_size	Size of encoded frame buffer
	data	Pointer to AVFrame of unencoded frame

Returns:: Returns 0 on success, -1 on failure

Definition at line 370 of file libxvidff.c.

static av_cold int xvid_encode_init ( AVCodecContext * avctx ) [static]

Creates the private context for the encoder.

All buffers are allocated, settings are loaded from the user, and the encoder context created.

Parameters:

avctx

AVCodecContext pointer to context

Returns:: Returns 0 on success, -1 on failure

Definition at line 85 of file libxvidff.c.

int xvid_ff_2pass	(	void *	ref,
		int	cmd,
		void *	p1,
		void *	p2
	)

Dispatch function for our custom plugin.

This handles the dispatch for the Xvid plugin. It passes data on to other functions for actual processing.

Parameters:

	ref	Context pointer for the plugin
	cmd	The task given for us to complete
	p1	First parameter (varies)
	p2	Second parameter (varies)

Returns:: Returns XVID_ERR_xxxx on failure, or 0 on success

Definition at line 744 of file libxvidff.c.

Referenced by xvid_encode_init().

static int xvid_ff_2pass_after	(	struct xvid_context *	ref,
		xvid_plg_data_t *	param
	)			`[static]`

Captures statistic data and writes it during first pass.

Parameters:

	ref	Context pointer for the plugin
	param	Statistic data

Returns:: Returns XVID_ERR_xxxx on failure, or 0 on success

Definition at line 708 of file libxvidff.c.

Referenced by xvid_ff_2pass().

static int xvid_ff_2pass_before	(	struct xvid_context *	ref,
		xvid_plg_data_t *	param
	)			`[static]`

Enables fast encode mode during the first pass.

Parameters:

	ref	Context pointer for the plugin
	param	Frame data

Returns:: Returns 0, success guaranteed

Definition at line 665 of file libxvidff.c.

Referenced by xvid_ff_2pass().

static int xvid_ff_2pass_create	(	xvid_plg_create_t *	param,
		void **	handle
	)			`[static]`

Initializes the two-pass plugin and context.

Parameters:

	param	Input construction parameter structure
	handle	Private context handle

Returns:: Returns XVID_ERR_xxxx on failure, or 0 on success.

Definition at line 618 of file libxvidff.c.

Referenced by xvid_ff_2pass().

static int xvid_ff_2pass_destroy	(	struct xvid_context *	ref,
		xvid_plg_destroy_t *	param
	)			`[static]`

Destroys the two-pass plugin context.

Parameters:

	ref	Context pointer for the plugin
	param	Destrooy context

Returns:: Returns 0, success guaranteed

Definition at line 649 of file libxvidff.c.

Referenced by xvid_ff_2pass().

int xvid_strip_vol_header	(	AVCodecContext *	avctx,
		unsigned char *	frame,
		unsigned int	header_len,
		unsigned int	frame_len
	)

Routine to create a global VO/VOL header for MP4 container.

What we do here is extract the header from the Xvid bitstream as it is encoded. We also strip the repeated headers from the bitstream when a global header is requested for MPEG-4 ISO compliance.

Parameters:

	avctx	AVCodecContext pointer to context
	frame	Pointer to encoded frame data
	header_len	Length of header to search
	frame_len	Length of encoded frame data

Returns:: Returns new length of frame data

Definition at line 512 of file libxvidff.c.

Referenced by xvid_encode_frame().

Variable Documentation

AVCodec libxvid_encoder

Initial value:

 {
    "libxvid",
    AVMEDIA_TYPE_VIDEO,
    CODEC_ID_MPEG4,
    sizeof(struct xvid_context),
    xvid_encode_init,
    xvid_encode_frame,
    xvid_encode_close,
    .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
    .long_name= NULL_IF_CONFIG_SMALL("libxvidcore MPEG-4 part 2"),
}

Xvid codec definition for libavcodec.

Definition at line 770 of file libxvidff.c.


Data Structures
struct	xvid_context
	Structure for the private Xvid context. More...
struct	xvid_ff_pass1
	Structure for the private first-pass plugin. More...
Defines
#define	BUFFER_SIZE 1024
	Buffer management macros.
#define	BUFFER_REMAINING(x) (BUFFER_SIZE - strlen(x))
#define	BUFFER_CAT(x) (&((x)[strlen(x)]))
Functions
int	has_altivec (void)
	This function MAY rely on signal() or fork() in order to make sure AltiVec is present.
int	xvid_strip_vol_header (AVCodecContext avctx, unsigned char frame, unsigned int header_len, unsigned int frame_len)
	Routine to create a global VO/VOL header for MP4 container.
int	xvid_ff_2pass (void ref, int cmd, void p1, void *p2)
	Dispatch function for our custom plugin.
void	xvid_correct_framerate (AVCodecContext *avctx)
	Routine to correct a possibly erroneous framerate being fed to us.
static av_cold int	xvid_encode_init (AVCodecContext *avctx)
	Creates the private context for the encoder.
static int	xvid_encode_frame (AVCodecContext avctx, unsigned char frame, int buf_size, void *data)
	Encodes a single frame.
static av_cold int	xvid_encode_close (AVCodecContext *avctx)
	Destroys the private context for the encoder.
static int	xvid_ff_2pass_create (xvid_plg_create_t param, void *handle)
	Initializes the two-pass plugin and context.
static int	xvid_ff_2pass_destroy (struct xvid_context ref, xvid_plg_destroy_t param)
	Destroys the two-pass plugin context.
static int	xvid_ff_2pass_before (struct xvid_context ref, xvid_plg_data_t param)
	Enables fast encode mode during the first pass.
static int	xvid_ff_2pass_after (struct xvid_context ref, xvid_plg_data_t param)
	Captures statistic data and writes it during first pass.
Variables
AVCodec	libxvid_encoder
	Xvid codec definition for libavcodec.