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h264dec.c File Reference

H.264 / AVC / MPEG-4 part10 codec. More...

#include "libavutil/avassert.h"
#include "libavutil/display.h"
#include "libavutil/imgutils.h"
#include "libavutil/opt.h"
#include "libavutil/stereo3d.h"
#include "libavutil/timer.h"
#include "internal.h"
#include "bytestream.h"
#include "cabac.h"
#include "cabac_functions.h"
#include "error_resilience.h"
#include "avcodec.h"
#include "h264.h"
#include "h264dec.h"
#include "h2645_parse.h"
#include "h264data.h"
#include "h264chroma.h"
#include "h264_mvpred.h"
#include "h264_ps.h"
#include "golomb.h"
#include "hwaccel.h"
#include "mathops.h"
#include "me_cmp.h"
#include "mpegutils.h"
#include "profiles.h"
#include "rectangle.h"
#include "thread.h"

Go to the source code of this file.

Macros

#define UNCHECKED_BITSTREAM_READER   1
 
#define OFFSET(x)   offsetof(H264Context, x)
 
#define VD   AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
 

Functions

int avpriv_h264_has_num_reorder_frames (AVCodecContext *avctx)
 
static void h264_er_decode_mb (void *opaque, int ref, int mv_dir, int mv_type, int(*mv)[2][4][2], int mb_x, int mb_y, int mb_intra, int mb_skipped)
 
void ff_h264_draw_horiz_band (const H264Context *h, H264SliceContext *sl, int y, int height)
 
void ff_h264_free_tables (H264Context *h)
 
int ff_h264_alloc_tables (H264Context *h)
 Allocate tables. More...
 
int ff_h264_slice_context_init (H264Context *h, H264SliceContext *sl)
 Init context Allocate buffers which are not shared amongst multiple threads. More...
 
static int h264_init_context (AVCodecContext *avctx, H264Context *h)
 
static av_cold int h264_decode_end (AVCodecContext *avctx)
 
static av_cold int h264_decode_init (AVCodecContext *avctx)
 
static void idr (H264Context *h)
 instantaneous decoder refresh. More...
 
void ff_h264_flush_change (H264Context *h)
 
static void flush_dpb (AVCodecContext *avctx)
 
static int get_last_needed_nal (H264Context *h)
 
static void debug_green_metadata (const H264SEIGreenMetaData *gm, void *logctx)
 
static int decode_nal_units (H264Context *h, const uint8_t *buf, int buf_size)
 
static int get_consumed_bytes (int pos, int buf_size)
 Return the number of bytes consumed for building the current frame. More...
 
static int output_frame (H264Context *h, AVFrame *dst, H264Picture *srcp)
 
static int is_extra (const uint8_t *buf, int buf_size)
 
static int finalize_frame (H264Context *h, AVFrame *dst, H264Picture *out, int *got_frame)
 
static int send_next_delayed_frame (H264Context *h, AVFrame *dst_frame, int *got_frame, int buf_index)
 
static int h264_decode_frame (AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
 

Variables

const uint16_t ff_h264_mb_sizes [4] = { 256, 384, 512, 768 }
 
static AVOnce h264_vlc_init = AV_ONCE_INIT
 
static const AVOption h264_options []
 
static const AVClass h264_class
 
AVCodec ff_h264_decoder
 

Detailed Description

H.264 / AVC / MPEG-4 part10 codec.

Author
Michael Niedermayer micha.nosp@m.elni.nosp@m.@gmx..nosp@m.at

Definition in file h264dec.c.

Macro Definition Documentation

#define UNCHECKED_BITSTREAM_READER   1

Definition at line 28 of file h264dec.c.

#define OFFSET (   x)    offsetof(H264Context, x)

Definition at line 1028 of file h264dec.c.

#define VD   AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM

Definition at line 1029 of file h264dec.c.

Function Documentation

int avpriv_h264_has_num_reorder_frames ( AVCodecContext *  avctx)

Definition at line 60 of file h264dec.c.

Referenced by has_decode_delay_been_guessed().

static void h264_er_decode_mb ( void *  opaque,
int  ref,
int  mv_dir,
int  mv_type,
int(*)  mv[2][4][2],
int  mb_x,
int  mb_y,
int  mb_intra,
int  mb_skipped 
)
static

Definition at line 66 of file h264dec.c.

Referenced by ff_h264_slice_context_init().

void ff_h264_draw_horiz_band ( const H264Context *  h,
H264SliceContext *  sl,
int  y,
int  height 
)

Definition at line 102 of file h264dec.c.

Referenced by decode_finish_row(), dxva2_h264_end_frame(), vaapi_h264_end_frame(), and vdpau_h264_end_frame().

void ff_h264_free_tables ( H264Context *  h)

Definition at line 137 of file h264dec.c.

Referenced by ff_h264_alloc_tables(), flush_dpb(), h264_decode_end(), and h264_slice_header_init().

int ff_h264_alloc_tables ( H264Context *  h)

Allocate tables.

needs width/height

Definition at line 180 of file h264dec.c.

Referenced by h264_slice_header_init().

int ff_h264_slice_context_init ( H264Context *  h,
H264SliceContext *  sl 
)

Init context Allocate buffers which are not shared amongst multiple threads.

Definition at line 238 of file h264dec.c.

Referenced by h264_slice_header_init().

static int h264_init_context ( AVCodecContext *  avctx,
H264Context *  h 
)
static

Definition at line 303 of file h264dec.c.

Referenced by h264_decode_init().

static av_cold int h264_decode_end ( AVCodecContext *  avctx)
static

Definition at line 358 of file h264dec.c.

Referenced by h264_decode_init().

static av_cold int h264_decode_init ( AVCodecContext *  avctx)
static

Definition at line 392 of file h264dec.c.

static void idr ( H264Context *  h)
static

instantaneous decoder refresh.

Definition at line 470 of file h264dec.c.

Referenced by decode_nal_units(), ff_h264_flush_change(), and h264_probe().

void ff_h264_flush_change ( H264Context *  h)

Definition at line 483 of file h264dec.c.

Referenced by flush_dpb(), h264_decode_init(), and h264_init_ps().

static void flush_dpb ( AVCodecContext *  avctx)
static

Definition at line 509 of file h264dec.c.

static int get_last_needed_nal ( H264Context *  h)
static

Definition at line 530 of file h264dec.c.

Referenced by decode_nal_units().

static void debug_green_metadata ( const H264SEIGreenMetaData *  gm,
void *  logctx 
)
static

Definition at line 572 of file h264dec.c.

Referenced by decode_nal_units().

static int decode_nal_units ( H264Context *  h,
const uint8_t *  buf,
int  buf_size 
)
static

< number of NALs that need decoding before the next frame thread starts

Definition at line 600 of file h264dec.c.

Referenced by h264_decode_frame().

static int get_consumed_bytes ( int  pos,
int  buf_size 
)
static

Return the number of bytes consumed for building the current frame.

Definition at line 822 of file h264dec.c.

Referenced by h264_decode_frame().

static int output_frame ( H264Context *  h,
AVFrame *  dst,
H264Picture *  srcp 
)
static
Examples:
transcode_aac.c.

Definition at line 832 of file h264dec.c.

Referenced by deint_vaapi_filter_frame(), finalize_frame(), load_encode_and_write(), misc_vaapi_filter_frame(), procamp_vaapi_filter_frame(), and scale_vaapi_filter_frame().

static int is_extra ( const uint8_t *  buf,
int  buf_size 
)
static

Definition at line 849 of file h264dec.c.

Referenced by h264_decode_frame().

static int finalize_frame ( H264Context *  h,
AVFrame *  dst,
H264Picture *  out,
int *  got_frame 
)
static

Definition at line 873 of file h264dec.c.

Referenced by h264_decode_frame(), and send_next_delayed_frame().

static int send_next_delayed_frame ( H264Context *  h,
AVFrame *  dst_frame,
int *  got_frame,
int  buf_index 
)
static

Definition at line 923 of file h264dec.c.

Referenced by h264_decode_frame().

static int h264_decode_frame ( AVCodecContext *  avctx,
void *  data,
int *  got_frame,
AVPacket *  avpkt 
)
static

Definition at line 956 of file h264dec.c.

Variable Documentation

const uint16_t ff_h264_mb_sizes[4] = { 256, 384, 512, 768 }

Definition at line 58 of file h264dec.c.

Referenced by ff_h264_decode_mb_cabac(), ff_h264_decode_mb_cavlc(), and hl_decode_mb().

AVOnce h264_vlc_init = AV_ONCE_INIT
static

Definition at line 390 of file h264dec.c.

const AVOption h264_options[]
static
Initial value:
= {
{ "is_avc", "is avc", OFFSET(is_avc), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, 0 },
{ "nal_length_size", "nal_length_size", OFFSET(nal_length_size), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 4, 0 },
{ "enable_er", "Enable error resilience on damaged frames (unsafe)", OFFSET(enable_er), AV_OPT_TYPE_BOOL, { .i64 = -1 }, -1, 1, VD },
{ "x264_build", "Assume this x264 version if no x264 version found in any SEI", OFFSET(x264_build), AV_OPT_TYPE_INT, {.i64 = -1}, -1, INT_MAX, VD },
{ NULL },
}
NULL
#define NULL
Definition: coverity.c:32
AV_OPT_TYPE_INT
Definition: opt.h:223
AV_OPT_TYPE_BOOL
Definition: opt.h:240
OFFSET
#define OFFSET(x)
Definition: h264dec.c:1028
VD
#define VD
Definition: h264dec.c:1029

Definition at line 1030 of file h264dec.c.

const AVClass h264_class
static
Initial value:
= {
.class_name = "H264 Decoder",
.item_name = av_default_item_name,
.option = h264_options,
.version = LIBAVUTIL_VERSION_INT,
}
LIBAVUTIL_VERSION_INT
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
av_default_item_name
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:191
h264_options
static const AVOption h264_options[]
Definition: h264dec.c:1030

Definition at line 1038 of file h264dec.c.

AVCodec ff_h264_decoder

Definition at line 1045 of file h264dec.c.

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