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libxvid.c File Reference

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

#include <xvid.h>
#include "libavutil/cpu.h"
#include "libavutil/file.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/mathematics.h"
#include "avcodec.h"
#include "internal.h"
#include "libxvid.h"
#include "mpegvideo.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...
 

Macros

#define BUFFER_SIZE   1024
 Buffer management macros.
 
#define BUFFER_REMAINING(x)   (BUFFER_SIZE - strlen(x))
 
#define BUFFER_CAT(x)   (&((x)[strlen(x)]))
 
#define OFFSET(x)   offsetof(struct xvid_context, x)
 
#define VE   AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
 

Functions

static int xvid_encode_close (AVCodecContext *avctx)
 
static int xvid_ff_2pass_create (xvid_plg_create_t *param, void **handle)
 Initialize the two-pass plugin and context.
 
static int xvid_ff_2pass_destroy (struct xvid_context *ref, xvid_plg_destroy_t *param)
 Destroy the two-pass plugin context.
 
static int xvid_ff_2pass_before (struct xvid_context *ref, xvid_plg_data_t *param)
 Enable fast encode mode during the first pass.
 
static int xvid_ff_2pass_after (struct xvid_context *ref, xvid_plg_data_t *param)
 Capture statistic data and write it during first pass.
 
static int xvid_ff_2pass (void *ref, int cmd, void *p1, void *p2)
 Dispatch function for our custom plugin.
 
static int xvid_strip_vol_header (AVCodecContext *avctx, AVPacket *pkt, unsigned int header_len, unsigned int frame_len)
 Routine to create a global VO/VOL header for MP4 container.
 
static 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)
 
static int xvid_encode_frame (AVCodecContext *avctx, AVPacket *pkt, const AVFrame *picture, int *got_packet)
 

Variables

static const AVOption options []
 
static const AVClass xvid_class
 
AVCodec ff_libxvid_encoder
 

Detailed Description

Interface to xvidcore for MPEG-4 compliant encoding.

Author
Adam Thayer (krevn.nosp@m.ik@c.nosp@m.omcas.nosp@m.t.ne.nosp@m.t)

Definition in file libxvid.c.

Macro Definition Documentation

#define BUFFER_SIZE   1024

Buffer management macros.

Definition at line 51 of file libxvid.c.

Referenced by xvid_encode_init().

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

Definition at line 52 of file libxvid.c.

Referenced by xvid_ff_2pass_after(), and xvid_ff_2pass_create().

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

Definition at line 53 of file libxvid.c.

Referenced by xvid_ff_2pass_after(), and xvid_ff_2pass_create().

#define OFFSET (   x)    offsetof(struct xvid_context, x)

Definition at line 842 of file libxvid.c.

Definition at line 843 of file libxvid.c.

Function Documentation

static av_cold int xvid_encode_close ( AVCodecContext avctx)
static

Definition at line 815 of file libxvid.c.

Referenced by xvid_encode_init().

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

Initialize the two-pass plugin and context.

Parameters
paramInput construction parameter structure
handlePrivate context handle
Returns
Returns XVID_ERR_xxxx on failure, or 0 on success.

Definition at line 109 of file libxvid.c.

Referenced by xvid_ff_2pass().

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

Destroy the two-pass plugin context.

Parameters
refContext pointer for the plugin
paramDestrooy context
Returns
Returns 0, success guaranteed

Definition at line 140 of file libxvid.c.

Referenced by xvid_ff_2pass().

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

Enable fast encode mode during the first pass.

Parameters
refContext pointer for the plugin
paramFrame data
Returns
Returns 0, success guaranteed

Definition at line 157 of file libxvid.c.

Referenced by xvid_ff_2pass().

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

Capture statistic data and write it during first pass.

Parameters
refContext pointer for the plugin
paramStatistic data
Returns
Returns XVID_ERR_xxxx on failure, or 0 on success

Definition at line 201 of file libxvid.c.

Referenced by xvid_ff_2pass().

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

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
refContext pointer for the plugin
cmdThe task given for us to complete
p1First parameter (varies)
p2Second parameter (varies)
Returns
Returns XVID_ERR_xxxx on failure, or 0 on success

Definition at line 238 of file libxvid.c.

Referenced by xvid_encode_init().

static int xvid_strip_vol_header ( AVCodecContext avctx,
AVPacket pkt,
unsigned int  header_len,
unsigned int  frame_len 
)
static

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
avctxAVCodecContext pointer to context
framePointer to encoded frame data
header_lenLength of header to search
frame_lenLength of encoded frame data
Returns
Returns new length of frame data

Definition at line 270 of file libxvid.c.

Referenced by xvid_encode_frame().

static void xvid_correct_framerate ( AVCodecContext avctx)
static

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
avctxContext that contains the framerate to correct.

Definition at line 310 of file libxvid.c.

Referenced by xvid_encode_init().

static av_cold int xvid_encode_init ( AVCodecContext avctx)
static

Definition at line 360 of file libxvid.c.

static int xvid_encode_frame ( AVCodecContext avctx,
AVPacket pkt,
const AVFrame picture,
int *  got_packet 
)
static

Definition at line 693 of file libxvid.c.

Variable Documentation

const AVOption options[]
static
Initial value:
= {
{ "lumi_aq", "Luminance masking AQ", OFFSET(lumi_aq), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
{ "variance_aq", "Variance AQ", OFFSET(variance_aq), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
{ "ssim", "Show SSIM information to stdout", OFFSET(ssim), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 2, VE, "ssim" },
{ "off", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 0 }, INT_MIN, INT_MAX, VE, "ssim" },
{ "avg", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 1 }, INT_MIN, INT_MAX, VE, "ssim" },
{ "frame", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 2 }, INT_MIN, INT_MAX, VE, "ssim" },
{ "ssim_acc", "SSIM accuracy", OFFSET(ssim_acc), AV_OPT_TYPE_INT, { .i64 = 2 }, 0, 4, VE },
{ "gmc", "use GMC", OFFSET(gmc), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
{ NULL },
}

Definition at line 844 of file libxvid.c.

const AVClass xvid_class
static
Initial value:
= {
.class_name = "libxvid",
.item_name = av_default_item_name,
.option = options,
}

Definition at line 856 of file libxvid.c.

AVCodec ff_libxvid_encoder
Initial value:
= {
.name = "libxvid",
.long_name = NULL_IF_CONFIG_SMALL("libxvidcore MPEG-4 part 2"),
.priv_data_size = sizeof(struct xvid_context),
.encode2 = xvid_encode_frame,
.pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE },
.priv_class = &xvid_class,
}

Definition at line 863 of file libxvid.c.