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h264.c File Reference

H.264 / AVC / MPEG4 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 "cabac.h"
#include "cabac_functions.h"
#include "error_resilience.h"
#include "avcodec.h"
#include "h264.h"
#include "h264data.h"
#include "h264chroma.h"
#include "h264_mvpred.h"
#include "golomb.h"
#include "mathops.h"
#include "me_cmp.h"
#include "mpegutils.h"
#include "profiles.h"
#include "rectangle.h"
#include "svq3.h"
#include "thread.h"
#include "vdpau_compat.h"

Go to the source code of this file.

Macros

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

Functions

static int h264_decode_end (AVCodecContext *avctx)
 
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)
 
int ff_h264_check_intra4x4_pred_mode (const H264Context *h, H264SliceContext *sl)
 Check if the top & left blocks are available if needed and change the dc mode so it only uses the available blocks. More...
 
int ff_h264_check_intra_pred_mode (const H264Context *h, H264SliceContext *sl, int mode, int is_chroma)
 Check if the top & left blocks are available if needed and change the dc mode so it only uses the available blocks. More...
 
const uint8_t * ff_h264_decode_nal (H264Context *h, H264SliceContext *sl, const uint8_t *src, int *dst_length, int *consumed, int length)
 Decode a network abstraction layer unit. More...
 
static int decode_rbsp_trailing (H264Context *h, const uint8_t *src)
 Identify the exact end of the bitstream. More...
 
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 decode_nal_units (H264Context *h, const uint8_t *buf, int buf_size, int parse_extradata)
 
int ff_h264_decode_extradata (H264Context *h, const uint8_t *buf, int size)
 
static int h264_init_context (AVCodecContext *avctx, H264Context *h)
 
av_cold int ff_h264_decode_init (AVCodecContext *avctx)
 
static void decode_postinit (H264Context *h, int setup_finished)
 Run setup operations that must be run after slice header decoding. More...
 
int ff_pred_weight_table (H264Context *h, H264SliceContext *sl)
 
static void idr (H264Context *h)
 instantaneous decoder refresh. More...
 
void ff_h264_flush_change (H264Context *h)
 
static void flush_dpb (AVCodecContext *avctx)
 
int ff_init_poc (H264Context *h, int pic_field_poc[2], int *pic_poc)
 
int ff_h264_get_profile (SPS *sps)
 Compute profile from profile_idc and constraint_set?_flags. More...
 
int ff_set_ref_count (H264Context *h, H264SliceContext *sl)
 
static int get_bit_length (H264Context *h, const uint8_t *buf, const uint8_t *ptr, int dst_length, int i, int next_avc)
 
static int get_last_needed_nal (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 h264_decode_frame (AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
 
av_cold void ff_h264_free_context (H264Context *h)
 Free any data that may have been allocated in the H264 context like SPS, PPS etc. More...
 

Variables

const uint16_t ff_h264_mb_sizes [4] = { 256, 384, 512, 768 }
 
static AVOnce h264_vlc_init = AV_ONCE_INIT
 
static const uint8_t start_code [] = { 0x00, 0x00, 0x01 }
 
static const AVOption h264_options []
 
static const AVClass h264_class
 
AVCodec ff_h264_decoder
 

Detailed Description

H.264 / AVC / MPEG4 part10 codec.

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

Definition in file h264.c.

Macro Definition Documentation

#define UNCHECKED_BITSTREAM_READER   1

Definition at line 28 of file h264.c.

#define STARTCODE_TEST
Value:
if (i + 2 < length && src[i + 1] == 0 && src[i + 2] <= 3) { \
if (src[i + 2] != 3 && src[i + 2] != 0) { \
/* startcode, so we must be past the end */ \
length = i; \
} \
break; \
}
length
GLsizei GLsizei * length
Definition: opengl_enc.c:115
src
#define src
Definition: vp9dsp.c:530
if
if(ret< 0)
Definition: vf_mcdeint.c:282

Referenced by ff_h264_decode_nal().

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

Definition at line 1955 of file h264.c.

#define VD   AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM

Definition at line 1956 of file h264.c.

Function Documentation

static av_cold int h264_decode_end ( AVCodecContext *  avctx)
static

Definition at line 1940 of file h264.c.

Referenced by ff_h264_decode_init().

int avpriv_h264_has_num_reorder_frames ( AVCodecContext *  avctx)

Definition at line 59 of file h264.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 65 of file h264.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 101 of file h264.c.

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

int ff_h264_check_intra4x4_pred_mode ( const H264Context *  h,
H264SliceContext *  sl 
)

Check if the top & left blocks are available if needed and change the dc mode so it only uses the available blocks.

Check if the top & left blocks are available if needed & change the dc mode so it only uses the available blocks.

Definition at line 140 of file h264.c.

Referenced by ff_h264_decode_mb_cabac(), ff_h264_decode_mb_cavlc(), and svq3_decode_mb().

int ff_h264_check_intra_pred_mode ( const H264Context *  h,
H264SliceContext *  sl,
int  mode,
int  is_chroma 
)

Check if the top & left blocks are available if needed and change the dc mode so it only uses the available blocks.

Check if the top & left blocks are available if needed & change the dc mode so it only uses the available blocks.

Definition at line 187 of file h264.c.

Referenced by ff_h264_decode_mb_cabac(), ff_h264_decode_mb_cavlc(), and svq3_decode_mb().

const uint8_t* ff_h264_decode_nal ( H264Context *  h,
H264SliceContext *  sl,
const uint8_t *  src,
int *  dst_length,
int *  consumed,
int  length 
)

Decode a network abstraction layer unit.

Parameters
consumedis the number of bytes used as input
lengthis the length of the array
dst_lengthis the number of decoded bytes FIXME here or a decode rbsp tailing?
Returns
decoded bytes, might be src+1 if no escapes

Definition at line 229 of file h264.c.

Referenced by decode_nal_units(), get_last_needed_nal(), and parse_nal_units().

static int decode_rbsp_trailing ( H264Context *  h,
const uint8_t *  src 
)
static

Identify the exact end of the bitstream.

Returns
the length of the trailing, or 0 if damaged

Definition at line 343 of file h264.c.

Referenced by get_bit_length().

void ff_h264_free_tables ( H264Context *  h)

Definition at line 358 of file h264.c.

Referenced by ff_h264_alloc_tables(), ff_h264_free_context(), flush_dpb(), and h264_slice_header_init().

int ff_h264_alloc_tables ( H264Context *  h)

Allocate tables.

needs width/height

Definition at line 401 of file h264.c.

Referenced by h264_slice_header_init(), and svq3_decode_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 462 of file h264.c.

Referenced by h264_slice_header_init().

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

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

Definition at line 1383 of file h264.c.

Referenced by ff_h264_decode_extradata(), and h264_decode_frame().

int ff_h264_decode_extradata ( H264Context *  h,
const uint8_t *  buf,
int  size 
)

Definition at line 530 of file h264.c.

Referenced by ff_h264_decode_init(), h264_decode_frame(), and h264_parse().

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

Definition at line 592 of file h264.c.

Referenced by ff_h264_decode_init().

av_cold int ff_h264_decode_init ( AVCodecContext *  avctx)

Definition at line 652 of file h264.c.

Referenced by svq3_decode_init().

static void decode_postinit ( H264Context *  h,
int  setup_finished 
)
static

Run setup operations that must be run after slice header decoding.

This includes finding the next displayed frame.

Parameters
hh264 master context
setup_finishedenough NALs have been read that we can call ff_thread_finish_setup()

Definition at line 740 of file h264.c.

Referenced by decode_nal_units(), and h264_decode_frame().

int ff_pred_weight_table ( H264Context *  h,
H264SliceContext *  sl 
)

Definition at line 1002 of file h264.c.

Referenced by ff_h264_decode_slice_header(), and scan_mmco_reset().

static void idr ( H264Context *  h)
static

instantaneous decoder refresh.

Definition at line 1077 of file h264.c.

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

void ff_h264_flush_change ( H264Context *  h)

Definition at line 1090 of file h264.c.

Referenced by ff_h264_decode_init(), ff_h264_decode_slice_header(), and flush_dpb().

static void flush_dpb ( AVCodecContext *  avctx)
static

Definition at line 1119 of file h264.c.

int ff_init_poc ( H264Context *  h,
int  pic_field_poc[2],
int *  pic_poc 
)

Definition at line 1139 of file h264.c.

Referenced by ff_h264_decode_slice_header(), and parse_nal_units().

int ff_h264_get_profile ( SPS *  sps)

Compute profile from profile_idc and constraint_set?_flags.

compute profile from sps

Parameters
spsSPS
Returns
profile as defined by FF_PROFILE_H264_*

Definition at line 1224 of file h264.c.

Referenced by ff_h264_decode_slice_header(), and parse_nal_units().

int ff_set_ref_count ( H264Context *  h,
H264SliceContext *  sl 
)

Definition at line 1244 of file h264.c.

Referenced by ff_h264_decode_slice_header(), and scan_mmco_reset().

static int get_bit_length ( H264Context *  h,
const uint8_t *  buf,
const uint8_t *  ptr,
int  dst_length,
int  i,
int  next_avc 
)
static

Definition at line 1300 of file h264.c.

Referenced by decode_nal_units(), and get_last_needed_nal().

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

Definition at line 1319 of file h264.c.

Referenced by decode_nal_units().

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 1693 of file h264.c.

Referenced by h264_decode_frame().

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

Definition at line 1703 of file h264.c.

Referenced by h264_decode_frame(), and load_encode_and_write().

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

Definition at line 1737 of file h264.c.

Referenced by h264_decode_frame().

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

Definition at line 1759 of file h264.c.

av_cold void ff_h264_free_context ( H264Context *  h)

Free any data that may have been allocated in the H264 context like SPS, PPS etc.

Definition at line 1911 of file h264.c.

Referenced by h264_close(), h264_decode_end(), and svq3_decode_end().

Variable Documentation

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

Definition at line 57 of file h264.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 650 of file h264.c.

const uint8_t start_code[] = { 0x00, 0x00, 0x01 }
static

Definition at line 1298 of file h264.c.

Referenced by commit_bitstream_and_slice_buffer(), decode_chunks(), ff_mjpeg_decode_frame(), ff_mjpeg_find_marker(), ff_msmpeg4_decode_picture_header(), ff_rtp_send_mpegvideo(), mpeg_decode_slice(), mpegvideo_extract_headers(), mxpeg_decode_frame(), and slice_decode_thread().

const AVOption h264_options[]
static
Initial value:
= {
{"is_avc", "is avc", 0x42, AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, 0},
{"nal_length_size", "nal_length_size", 0x42, 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 },
{ NULL },
}
NULL
#define NULL
Definition: coverity.c:32
AV_OPT_TYPE_INT
Definition: opt.h:223
OFFSET
#define OFFSET(x)
Definition: h264.c:1955
AV_OPT_TYPE_BOOL
Definition: opt.h:239
VD
#define VD
Definition: h264.c:1956

Definition at line 1957 of file h264.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:70
av_default_item_name
av_default_item_name
Definition: libopenh264enc.c:68
h264_options
static const AVOption h264_options[]
Definition: h264.c:1957

Definition at line 1964 of file h264.c.

AVCodec ff_h264_decoder
Initial value:
= {
.name = "h264",
.long_name = NULL_IF_CONFIG_SMALL("H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_H264,
.priv_data_size = sizeof(H264Context),
.init = ff_h264_decode_init,
.close = h264_decode_end,
.decode = h264_decode_frame,
.capabilities = AV_CODEC_CAP_DR1 |
AV_CODEC_CAP_DELAY | AV_CODEC_CAP_SLICE_THREADS |
AV_CODEC_CAP_FRAME_THREADS,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
.flush = flush_dpb,
.init_thread_copy = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy),
.update_thread_context = ONLY_IF_THREADS_ENABLED(ff_h264_update_thread_context),
.profiles = NULL_IF_CONFIG_SMALL(ff_h264_profiles),
.priv_class = &h264_class,
}
h264_class
static const AVClass h264_class
Definition: h264.c:1964
flush
static void flush(AVCodecContext *avctx)
Definition: aacdec_template.c:496
init_thread_copy
static int init_thread_copy(AVCodecContext *avctx)
Definition: tta.c:390
init
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
ff_h264_decode_init
av_cold int ff_h264_decode_init(AVCodecContext *avctx)
Definition: h264.c:652
H264Context
H264Context.
Definition: h264.h:522
AV_CODEC_ID_H264
Definition: avcodec.h:134
AV_CODEC_CAP_DELAY
#define AV_CODEC_CAP_DELAY
Encoder or decoder requires flushing with NULL input at the end in order to give the complete and cor...
Definition: avcodec.h:881
FF_CODEC_CAP_INIT_THREADSAFE
#define FF_CODEC_CAP_INIT_THREADSAFE
The codec does not modify any global variables in the init function, allowing to call the init functi...
Definition: internal.h:40
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:176
flush_dpb
static void flush_dpb(AVCodecContext *avctx)
Definition: h264.c:1119
AV_CODEC_CAP_FRAME_THREADS
#define AV_CODEC_CAP_FRAME_THREADS
Codec supports frame-level multithreading.
Definition: avcodec.h:919
ONLY_IF_THREADS_ENABLED
#define ONLY_IF_THREADS_ENABLED(x)
Define a function with only the non-default version specified.
Definition: internal.h:215
h264_decode_frame
static int h264_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: h264.c:1759
AV_CODEC_CAP_SLICE_THREADS
#define AV_CODEC_CAP_SLICE_THREADS
Codec supports slice-based (or partition-based) multithreading.
Definition: avcodec.h:923
ff_h264_update_thread_context
int ff_h264_update_thread_context(AVCodecContext *dst, const AVCodecContext *src)
Definition: h264_slice.c:433
h264_decode_end
static int h264_decode_end(AVCodecContext *avctx)
Definition: h264.c:1940
decode
static int decode(AVCodecContext *avctx, void *data, int *got_sub, AVPacket *avpkt)
Definition: ccaption_dec.c:572
ff_h264_profiles
const AVProfile ff_h264_profiles[]
Definition: profiles.c:50
AVMEDIA_TYPE_VIDEO
Definition: avutil.h:193
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:856

Definition at line 1971 of file h264.c.

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