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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 "dsputil.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 "mpegutils.h"
#include "rectangle.h"
#include "svq3.h"
#include "thread.h"
#include "vdpau_internal.h"
#include <assert.h>

Go to the source code of this file.

Macros

#define UNCHECKED_BITSTREAM_READER   1
 
#define STARTCODE_TEST
 

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 (H264Context *h, int y, int height)
 
int ff_h264_check_intra4x4_pred_mode (H264Context *h)
 Check if the top & left blocks are available if needed and change the dc mode so it only uses the available blocks.
 
int ff_h264_check_intra_pred_mode (H264Context *h, 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.
 
const uint8_t * ff_h264_decode_nal (H264Context *h, const uint8_t *src, int *dst_length, int *consumed, int length)
 Decode a network abstraction layer unit.
 
static int decode_rbsp_trailing (H264Context *h, const uint8_t *src)
 Identify the exact end of the bitstream.
 
void ff_h264_free_tables (H264Context *h, int free_rbsp)
 
int ff_h264_alloc_tables (H264Context *h)
 Allocate tables.
 
int ff_h264_context_init (H264Context *h)
 Init context Allocate buffers which are not shared amongst multiple threads.
 
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)
 
av_cold int ff_h264_decode_init (AVCodecContext *avctx)
 
static int decode_init_thread_copy (AVCodecContext *avctx)
 
static void decode_postinit (H264Context *h, int setup_finished)
 Run setup operations that must be run after slice header decoding.
 
int ff_pred_weight_table (H264Context *h)
 
static void idr (H264Context *h)
 instantaneous decoder refresh.
 
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.
 
int ff_h264_set_parameter_from_sps (H264Context *h)
 
int ff_set_ref_count (H264Context *h)
 
static int find_start_code (const uint8_t *buf, int buf_size, int buf_index, int next_avc)
 
static int get_avc_nalsize (H264Context *h, const uint8_t *buf, int buf_size, int *buf_index)
 
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.
 
static int output_frame (H264Context *h, AVFrame *dst, H264Picture *srcp)
 
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.
 
static av_cold int h264_decode_end (AVCodecContext *avctx)
 

Variables

const uint16_t ff_h264_mb_sizes [4] = { 256, 384, 512, 768 }
 
static const uint8_t start_code [] = { 0x00, 0x00, 0x01 }
 
static const AVProfile profiles []
 
static const AVOption h264_options []
 
static const AVClass h264_class
 
static const AVClass h264_vdpau_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) { \
/* startcode, so we must be past the end */ \
length = i; \
} \
break; \
}

Referenced by ff_h264_decode_nal(), and ff_hevc_extract_rbsp().

Function Documentation

int avpriv_h264_has_num_reorder_frames ( AVCodecContext *  avctx)

Definition at line 58 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 64 of file h264.c.

Referenced by ff_h264_context_init().

void ff_h264_draw_horiz_band ( H264Context *  h,
int  y,
int  height 
)

Definition at line 99 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 ( H264Context *  h)

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 147 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 ( H264Context *  h,
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 194 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,
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 235 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 353 of file h264.c.

Referenced by get_bit_length().

void ff_h264_free_tables ( H264Context *  h,
int  free_rbsp 
)

Definition at line 368 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 429 of file h264.c.

Referenced by ff_h264_update_thread_context(), h264_slice_header_init(), and svq3_decode_init().

int ff_h264_context_init ( H264Context *  h)

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

Definition at line 494 of file h264.c.

Referenced by ff_h264_update_thread_context(), and h264_slice_header_init().

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

< thread context

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

Definition at line 1452 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 566 of file h264.c.

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

av_cold int ff_h264_decode_init ( AVCodecContext *  avctx)

Definition at line 628 of file h264.c.

Referenced by svq3_decode_init().

static int decode_init_thread_copy ( AVCodecContext *  avctx)
static

Definition at line 718 of file h264.c.

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 744 of file h264.c.

Referenced by decode_nal_units(), and h264_decode_frame().

int ff_pred_weight_table ( H264Context *  h)

Definition at line 983 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 1048 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 1061 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 1091 of file h264.c.

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

Definition at line 1123 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 1208 of file h264.c.

Referenced by ff_h264_decode_slice_header(), and parse_nal_units().

int ff_h264_set_parameter_from_sps ( H264Context *  h)

Definition at line 1228 of file h264.c.

Referenced by ff_h264_decode_slice_header(), and ff_h264_update_thread_context().

int ff_set_ref_count ( H264Context *  h)

Definition at line 1277 of file h264.c.

Referenced by ff_h264_decode_slice_header(), and scan_mmco_reset().

static int find_start_code ( const uint8_t *  buf,
int  buf_size,
int  buf_index,
int  next_avc 
)
static

Definition at line 1333 of file h264.c.

Referenced by decode_nal_units(), and get_last_needed_nal().

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

Definition at line 1352 of file h264.c.

Referenced by decode_nal_units(), and get_last_needed_nal().

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 1370 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 1389 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 1783 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 1793 of file h264.c.

Referenced by h264_decode_frame(), and load_encode_and_write().

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

Definition at line 1819 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 1943 of file h264.c.

Referenced by close(), ff_h264_decode_init(), h264_decode_end(), and svq3_decode_end().

static av_cold int h264_decode_end ( AVCodecContext *  avctx)
static

Definition at line 1956 of file h264.c.

Variable Documentation

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

Definition at line 56 of file h264.c.

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

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

Definition at line 1331 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 AVProfile profiles[]
static
Initial value:
= {
{ FF_PROFILE_H264_BASELINE, "Baseline" },
{ FF_PROFILE_H264_CONSTRAINED_BASELINE, "Constrained Baseline" },
{ FF_PROFILE_H264_MAIN, "Main" },
{ FF_PROFILE_H264_EXTENDED, "Extended" },
{ FF_PROFILE_H264_HIGH, "High" },
{ FF_PROFILE_H264_HIGH_10, "High 10" },
{ FF_PROFILE_H264_HIGH_10_INTRA, "High 10 Intra" },
{ FF_PROFILE_H264_HIGH_422, "High 4:2:2" },
{ FF_PROFILE_H264_HIGH_422_INTRA, "High 4:2:2 Intra" },
{ FF_PROFILE_H264_HIGH_444, "High 4:4:4" },
{ FF_PROFILE_H264_HIGH_444_PREDICTIVE, "High 4:4:4 Predictive" },
{ FF_PROFILE_H264_HIGH_444_INTRA, "High 4:4:4 Intra" },
{ FF_PROFILE_H264_CAVLC_444, "CAVLC 4:4:4" },
{ FF_PROFILE_UNKNOWN },
}

Definition at line 1968 of file h264.c.

const AVOption h264_options[]
static
Initial value:
= {
{"is_avc", "is avc", 0x42, FF_OPT_TYPE_INT, {.i64 = 0}, 0, 1, 0},
{"nal_length_size", "nal_length_size", 0x42, FF_OPT_TYPE_INT, {.i64 = 0}, 0, 4, 0},
{NULL}
}

Definition at line 1985 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,
}

Definition at line 1991 of file h264.c.

const AVClass h264_vdpau_class
static
Initial value:
= {
.class_name = "H264 VDPAU Decoder",
.item_name = av_default_item_name,
.option = h264_options,
.version = LIBAVUTIL_VERSION_INT,
}

Definition at line 1998 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 = CODEC_CAP_DR1 |
CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS |
CODEC_CAP_FRAME_THREADS,
.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(profiles),
.priv_class = &h264_class,
}

Definition at line 2005 of file h264.c.

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