FFmpeg
Macros | Functions | Variables
ffv1dec.c File Reference
#include "libavutil/avassert.h"
#include "libavutil/crc.h"
#include "libavutil/mem.h"
#include "libavutil/imgutils.h"
#include "libavutil/pixdesc.h"
#include "avcodec.h"
#include "codec_internal.h"
#include "get_bits.h"
#include "rangecoder.h"
#include "golomb.h"
#include "mathops.h"
#include "ffv1.h"
#include "progressframe.h"
#include "libavutil/refstruct.h"
#include "thread.h"
#include "decode.h"
#include "hwconfig.h"
#include "hwaccel_internal.h"
#include "config_components.h"
#include "ffv1dec_template.c"

Go to the source code of this file.

Macros

#define  TYPE   int16_t
 
#define  RENAME(name)   name
 
#define  TYPE   int32_t
 
#define  RENAME(name)   name ## 32
 

Functions

static int  get_vlc_symbol (GetBitContext *gb, VlcState *const state, int bits)
 
static int  is_input_end (RangeCoder *c, GetBitContext *gb, int ac)
 
static int  decode_plane (FFV1Context *f, FFV1SliceContext *sc, GetBitContext *gb, uint8_t *src, int w, int h, int stride, int plane_index, int remap_index, int pixel_stride, int ac)
 
static int  decode_slice_header (const FFV1Context *f, FFV1SliceContext *sc, AVFrame *frame)
 
static void  slice_set_damaged (FFV1Context *f, FFV1SliceContext *sc)
 
static int  decode_current_mul (RangeCoder *rc, uint8_t state[32], int *mul, int mul_count, int64_t i)
 
static int  decode_remap (FFV1Context *f, FFV1SliceContext *sc)
 
static int  decode_slice (AVCodecContext *c, void *arg)
 
static enum AVPixelFormat  get_pixel_format (FFV1Context *f)
 
static int  read_header (FFV1Context *f, RangeCoder *c)
 
static av_cold int  decode_init (AVCodecContext *avctx)
 
static int  find_next_slice (AVCodecContext *avctx, uint8_t *buf, uint8_t *buf_end, int idx, uint8_t **pos, uint32_t *len)
 
static int  decode_header (AVCodecContext *avctx, RangeCoder *c, uint8_t *buf, size_t buf_size)
 
static int  decode_slices (AVCodecContext *avctx, RangeCoder c, AVPacket *avpkt)
 
static int  decode_frame (AVCodecContext *avctx, AVFrame *rframe, int *got_frame, AVPacket *avpkt)
 
static av_cold int  ffv1_decode_close (AVCodecContext *avctx)
 

Variables

const FFCodec  ff_ffv1_decoder
 

Detailed Description

FF Video Codec 1 (a lossless codec) decoder

Definition in file ffv1dec.c.

Macro Definition Documentation

◆ TYPE [1/2]

#define TYPE   int16_t

Definition at line 96 of file ffv1dec.c.

◆ RENAME [1/2]

#define RENAME (   name )    name

Definition at line 97 of file ffv1dec.c.

◆ TYPE [2/2]

#define TYPE   int32_t

Definition at line 96 of file ffv1dec.c.

◆ RENAME [2/2]

#define RENAME (   name )    name ## 32

Definition at line 97 of file ffv1dec.c.

Function Documentation

◆ get_vlc_symbol()

static int get_vlc_symbol ( GetBitContext *  gb,
VlcState *const  state,
int  bits 
)
inlinestatic

Definition at line 48 of file ffv1dec.c.

Referenced by decode_line().

◆ is_input_end()

static int is_input_end ( RangeCoder *  c,
GetBitContext *  gb,
int  ac 
)
static

Definition at line 78 of file ffv1dec.c.

Referenced by decode_line().

◆ decode_plane()

static int decode_plane ( FFV1Context *  f,
FFV1SliceContext *  sc,
GetBitContext *  gb,
uint8_t *  src,
int  w,
int  h,
int  stride,
int  plane_index,
int  remap_index,
int  pixel_stride,
int  ac 
)
static

Definition at line 100 of file ffv1dec.c.

Referenced by decode_slice().

◆ decode_slice_header()

static int decode_slice_header ( const FFV1Context *  f,
FFV1SliceContext *  sc,
AVFrame *  frame 
)
static

Definition at line 174 of file ffv1dec.c.

Referenced by decode_slice().

◆ slice_set_damaged()

static void slice_set_damaged ( FFV1Context *  f,
FFV1SliceContext *  sc 
)
static

Definition at line 277 of file ffv1dec.c.

Referenced by decode_slice(), and decode_slices().

◆ decode_current_mul()

static int decode_current_mul ( RangeCoder *  rc,
uint8_t  state[32],
int *  mul,
int  mul_count,
int64_t  i 
)
static

Definition at line 287 of file ffv1dec.c.

Referenced by decode_remap().

◆ decode_remap()

static int decode_remap ( FFV1Context *  f,
FFV1SliceContext *  sc 
)
static

Definition at line 298 of file ffv1dec.c.

Referenced by decode_slice().

◆ decode_slice()

static int decode_slice ( AVCodecContext *  c,
void *  arg 
)
static

Definition at line 360 of file ffv1dec.c.

Referenced by av1_receive_frame_internal(), decode_nal_units(), decode_slices(), dxtory_decode_v2(), ff_mjpeg_decode_sos(), and mpeg_decode_slice().

◆ get_pixel_format()

static enum AVPixelFormat get_pixel_format ( FFV1Context *  f )
static

Definition at line 485 of file ffv1dec.c.

Referenced by read_header().

◆ read_header()

static int read_header ( FFV1Context *  f,
RangeCoder *  c 
)
static

Definition at line 498 of file ffv1dec.c.

Referenced by decode_header(), and mjpegb_decode_frame().

◆ decode_init()

static av_cold int decode_init ( AVCodecContext *  avctx )
static

Definition at line 603 of file ffv1dec.c.

◆ find_next_slice()

static int find_next_slice ( AVCodecContext *  avctx,
uint8_t *  buf,
uint8_t *  buf_end,
int  idx,
uint8_t **  pos,
uint32_t *  len 
)
static

Definition at line 623 of file ffv1dec.c.

Referenced by decode_frame(), and decode_slices().

◆ decode_header()

static int decode_header ( AVCodecContext *  avctx,
RangeCoder *  c,
uint8_t *  buf,
size_t  buf_size 
)
static

Definition at line 655 of file ffv1dec.c.

Referenced by decode_frame().

◆ decode_slices()

static int decode_slices ( AVCodecContext *  avctx,
RangeCoder  c,
AVPacket *  avpkt 
)
static

Definition at line 699 of file ffv1dec.c.

Referenced by decode_frame().

◆ decode_frame()

static int decode_frame ( AVCodecContext *  avctx,
AVFrame *  rframe,
int *  got_frame,
AVPacket *  avpkt 
)
static

Definition at line 789 of file ffv1dec.c.

◆ ffv1_decode_close()

static av_cold int ffv1_decode_close ( AVCodecContext *  avctx )
static

Definition at line 962 of file ffv1dec.c.

Variable Documentation

◆ ff_ffv1_decoder

const FFCodec ff_ffv1_decoder
Initial value:
= {
.p.name = "ffv1",
CODEC_LONG_NAME("FFmpeg video codec #1"),
.p.type = AVMEDIA_TYPE_VIDEO,
.priv_data_size = sizeof(FFV1Context),
.p.capabilities = AV_CODEC_CAP_DR1 |
.caps_internal = FF_CODEC_CAP_INIT_CLEANUP |
.hw_configs = (const AVCodecHWConfigInternal *const []) {
},
}

Definition at line 977 of file ffv1dec.c.

FF_CODEC_CAP_INIT_CLEANUP
#define FF_CODEC_CAP_INIT_CLEANUP
The codec allows calling the close function for deallocation even if the init function returned a fai...
Definition: codec_internal.h:42
close
static av_cold void close(AVCodecParserContext *s)
Definition: apv_parser.c:135
ffv1_decode_close
static av_cold int ffv1_decode_close(AVCodecContext *avctx)
Definition: ffv1dec.c:962
FF_CODEC_CAP_USES_PROGRESSFRAMES
#define FF_CODEC_CAP_USES_PROGRESSFRAMES
The decoder might make use of the ProgressFrame API.
Definition: codec_internal.h:68
FF_CODEC_DECODE_CB
#define FF_CODEC_DECODE_CB(func)
Definition: codec_internal.h:346
decode_frame
static int decode_frame(AVCodecContext *avctx, AVFrame *rframe, int *got_frame, AVPacket *avpkt)
Definition: ffv1dec.c:789
CODEC_LONG_NAME
#define CODEC_LONG_NAME(str)
Definition: codec_internal.h:331
AV_CODEC_CAP_FRAME_THREADS
#define AV_CODEC_CAP_FRAME_THREADS
Codec supports frame-level multithreading.
Definition: codec.h:95
NULL
#define NULL
Definition: coverity.c:32
UPDATE_THREAD_CONTEXT
#define UPDATE_THREAD_CONTEXT(func)
Definition: codec_internal.h:340
AV_CODEC_ID_FFV1
@ AV_CODEC_ID_FFV1
Definition: codec_id.h:85
init
int(* init)(AVBSFContext *ctx)
Definition: dts2pts.c:368
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:52
FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM
#define FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM
The decoder extracts and fills its parameters even if the frame is skipped due to the skip_frame sett...
Definition: codec_internal.h:54
AVCodecHWConfigInternal
Definition: hwconfig.h:25
AV_CODEC_CAP_SLICE_THREADS
#define AV_CODEC_CAP_SLICE_THREADS
Codec supports slice-based (or partition-based) multithreading.
Definition: codec.h:99
decode_init
static av_cold int decode_init(AVCodecContext *avctx)
Definition: ffv1dec.c:603
update_thread_context
the pkt_dts and pkt_pts fields in AVFrame will work as usual Restrictions on codec whose streams don t reset across will not work because their bitstreams cannot be decoded in parallel *The contents of buffers must not be read before as well as code calling up to before the decode process starts Call have update_thread_context() run it in the next thread. Add AV_CODEC_CAP_FRAME_THREADS to the codec capabilities. There will be very little speed gain at this point but it should work. Use ff_thread_get_buffer()(or ff_progress_frame_get_buffer() in case you have inter-frame dependencies and use the ProgressFrame API) to allocate frame buffers. Call ff_progress_frame_report() after some part of the current picture has decoded. A good place to put this is where draw_horiz_band() is called - add this if it isn 't called anywhere
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:200
FFV1Context
Definition: ffv1.h:122
Generated on Sat Oct 18 2025 19:23:51 for FFmpeg by   doxygen 1.8.17

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