FFmpeg  4.0
Data Structures | Functions | Variables
dvdec.c File Reference

DV decoder. More...

#include "libavutil/avassert.h"
#include "libavutil/imgutils.h"
#include "libavutil/internal.h"
#include "libavutil/pixdesc.h"
#include "avcodec.h"
#include "dv.h"
#include "dv_profile_internal.h"
#include "dvdata.h"
#include "get_bits.h"
#include "idctdsp.h"
#include "internal.h"
#include "put_bits.h"
#include "simple_idct.h"

Go to the source code of this file.

Data Structures

struct  BlockInfo
 

Functions

static void dv_init_weight_tables (DVVideoContext *ctx, const AVDVProfile *d)
 
static av_cold int dvvideo_decode_init (AVCodecContext *avctx)
 
static void dv_decode_ac (GetBitContext *gb, BlockInfo *mb, int16_t *block)
 
static void bit_copy (PutBitContext *pb, GetBitContext *gb)
 
static int dv_decode_video_segment (AVCodecContext *avctx, void *arg)
 
static int dvvideo_decode_frame (AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
 

Variables

static const int dv_iweight_bits = 14
 
static const uint16_t dv_iweight_88 [64]
 
static const uint16_t dv_iweight_248 [64]
 
static const uint16_t dv_iweight_1080_y [64]
 The "inverse" DV100 weights are actually just the spec weights (zig-zagged). More...
 
static const uint16_t dv_iweight_1080_c [64]
 
static const uint16_t dv_iweight_720_y [64]
 
static const uint16_t dv_iweight_720_c [64]
 
AVCodec ff_dvvideo_decoder
 

Detailed Description

DV decoder.

Definition in file dvdec.c.

Function Documentation

◆ dv_init_weight_tables()

static void dv_init_weight_tables ( DVVideoContext *  ctx,
const AVDVProfile *  d 
)
static

Definition at line 130 of file dvdec.c.

Referenced by dvvideo_decode_frame().

◆ dvvideo_decode_init()

static av_cold int dvvideo_decode_init ( AVCodecContext *  avctx)
static

Definition at line 176 of file dvdec.c.

◆ dv_decode_ac()

static void dv_decode_ac ( GetBitContext *  gb,
BlockInfo *  mb,
int16_t *  block 
)
static

Definition at line 203 of file dvdec.c.

Referenced by dv_decode_video_segment().

◆ bit_copy()

static void bit_copy ( PutBitContext *  pb,
GetBitContext *  gb 
)
inlinestatic

Definition at line 263 of file dvdec.c.

Referenced by dv_decode_video_segment().

◆ dv_decode_video_segment()

static int dv_decode_video_segment ( AVCodecContext *  avctx,
void *  arg 
)
static

Definition at line 275 of file dvdec.c.

Referenced by dvvideo_decode_frame().

◆ dvvideo_decode_frame()

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

Definition at line 496 of file dvdec.c.

Variable Documentation

◆ dv_iweight_bits

const int dv_iweight_bits = 14
static

Definition at line 63 of file dvdec.c.

Referenced by dv_decode_ac().

◆ dv_iweight_88

const uint16_t dv_iweight_88[64]
static
Initial value:
= {
32768, 16705, 16705, 17734, 17032, 17734, 18205, 18081,
18081, 18205, 18725, 18562, 19195, 18562, 18725, 19266,
19091, 19705, 19705, 19091, 19266, 21407, 19643, 20267,
20228, 20267, 19643, 21407, 22725, 21826, 20853, 20806,
20806, 20853, 21826, 22725, 23170, 23170, 21407, 21400,
21407, 23170, 23170, 24598, 23786, 22018, 22018, 23786,
24598, 25251, 24465, 22654, 24465, 25251, 25972, 25172,
25172, 25972, 26722, 27969, 26722, 29692, 29692, 31521,
}

Definition at line 65 of file dvdec.c.

Referenced by dv_init_weight_tables().

◆ dv_iweight_248

const uint16_t dv_iweight_248[64]
static
Initial value:
= {
32768, 16384, 16705, 16705, 17734, 17734, 17734, 17734,
18081, 18081, 18725, 18725, 21407, 21407, 19091, 19091,
19195, 19195, 18205, 18205, 18725, 18725, 19705, 19705,
20267, 20267, 21826, 21826, 23170, 23170, 20806, 20806,
20267, 20267, 19266, 19266, 21407, 21407, 20853, 20853,
21400, 21400, 23786, 23786, 24465, 24465, 22018, 22018,
23170, 23170, 22725, 22725, 24598, 24598, 24465, 24465,
25172, 25172, 27969, 27969, 25972, 25972, 29692, 29692
}

Definition at line 75 of file dvdec.c.

Referenced by dv_init_weight_tables().

◆ dv_iweight_1080_y

const uint16_t dv_iweight_1080_y[64]
static
Initial value:
= {
128, 16, 16, 17, 17, 17, 18, 18,
18, 18, 18, 18, 19, 18, 18, 19,
19, 19, 19, 19, 19, 42, 38, 40,
40, 40, 38, 42, 44, 43, 41, 41,
41, 41, 43, 44, 45, 45, 42, 42,
42, 45, 45, 48, 46, 43, 43, 46,
48, 49, 48, 44, 48, 49, 101, 98,
98, 101, 104, 109, 104, 116, 116, 123,
}

The "inverse" DV100 weights are actually just the spec weights (zig-zagged).

Definition at line 89 of file dvdec.c.

Referenced by dv_init_weight_tables().

◆ dv_iweight_1080_c

const uint16_t dv_iweight_1080_c[64]
static
Initial value:
= {
128, 16, 16, 17, 17, 17, 25, 25,
25, 25, 26, 25, 26, 25, 26, 26,
26, 27, 27, 26, 26, 42, 38, 40,
40, 40, 38, 42, 44, 43, 41, 41,
41, 41, 43, 44, 91, 91, 84, 84,
84, 91, 91, 96, 93, 86, 86, 93,
96, 197, 191, 177, 191, 197, 203, 197,
197, 203, 209, 219, 209, 232, 232, 246,
}

Definition at line 99 of file dvdec.c.

Referenced by dv_init_weight_tables().

◆ dv_iweight_720_y

const uint16_t dv_iweight_720_y[64]
static
Initial value:
= {
128, 16, 16, 17, 17, 17, 18, 18,
18, 18, 18, 18, 19, 18, 18, 19,
19, 19, 19, 19, 19, 42, 38, 40,
40, 40, 38, 42, 44, 43, 41, 41,
41, 41, 43, 44, 68, 68, 63, 63,
63, 68, 68, 96, 92, 86, 86, 92,
96, 98, 96, 88, 96, 98, 202, 196,
196, 202, 208, 218, 208, 232, 232, 246,
}

Definition at line 109 of file dvdec.c.

Referenced by dv_init_weight_tables().

◆ dv_iweight_720_c

const uint16_t dv_iweight_720_c[64]
static
Initial value:
= {
128, 24, 24, 26, 26, 26, 36, 36,
36, 36, 36, 36, 38, 36, 36, 38,
38, 38, 38, 38, 38, 84, 76, 80,
80, 80, 76, 84, 88, 86, 82, 82,
82, 82, 86, 88, 182, 182, 168, 168,
168, 182, 182, 192, 186, 192, 172, 186,
192, 394, 382, 354, 382, 394, 406, 394,
394, 406, 418, 438, 418, 464, 464, 492,
}

Definition at line 119 of file dvdec.c.

Referenced by dv_init_weight_tables().

◆ ff_dvvideo_decoder

AVCodec ff_dvvideo_decoder
Initial value:
= {
.name = "dvvideo",
.long_name = NULL_IF_CONFIG_SMALL("DV (Digital Video)"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_DVVIDEO,
.priv_data_size = sizeof(DVVideoContext),
.init = dvvideo_decode_init,
.decode = dvvideo_decode_frame,
.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_SLICE_THREADS,
.max_lowres = 3,
}
init
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
decode
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:42
dvvideo_decode_init
static av_cold int dvvideo_decode_init(AVCodecContext *avctx)
Definition: dvdec.c:176
AV_CODEC_ID_DVVIDEO
Definition: avcodec.h:242
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:186
AV_CODEC_CAP_SLICE_THREADS
#define AV_CODEC_CAP_SLICE_THREADS
Codec supports slice-based (or partition-based) multithreading.
Definition: avcodec.h:1019
dvvideo_decode_frame
static int dvvideo_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: dvdec.c:496
AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:959

Definition at line 564 of file dvdec.c.

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