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mpeg12dec.c File Reference

MPEG-1/2 decoder. More...

#include "libavutil/attributes.h"
#include "libavutil/internal.h"
#include "libavutil/stereo3d.h"
#include "avcodec.h"
#include "bytestream.h"
#include "dsputil.h"
#include "error_resilience.h"
#include "internal.h"
#include "mpeg12.h"
#include "mpeg12data.h"
#include "mpegvideo.h"
#include "thread.h"
#include "version.h"
#include "xvmc_internal.h"

Go to the source code of this file.

Data Structures

struct  Mpeg1Context

Macros

#define MB_TYPE_ZERO_MV   0x20000000
#define check_scantable_index(ctx, x)
#define MT_FIELD   1
#define MT_FRAME   2
#define MT_16X8   2
#define MT_DMV   3
#define DECODE_SLICE_ERROR   -1
#define DECODE_SLICE_OK   0

Functions

static int mpeg_decode_motion (MpegEncContext *s, int fcode, int pred)
static int mpeg1_decode_block_intra (MpegEncContext *s, int16_t *block, int n)
int ff_mpeg1_decode_block_intra (MpegEncContext *s, int16_t *block, int n)
static int mpeg1_decode_block_inter (MpegEncContext *s, int16_t *block, int n)
static int mpeg1_fast_decode_block_inter (MpegEncContext *s, int16_t *block, int n)
static int mpeg2_decode_block_non_intra (MpegEncContext *s, int16_t *block, int n)
static int mpeg2_fast_decode_block_non_intra (MpegEncContext *s, int16_t *block, int n)
static int mpeg2_decode_block_intra (MpegEncContext *s, int16_t *block, int n)
static int mpeg2_fast_decode_block_intra (MpegEncContext *s, int16_t *block, int n)
static int get_dmv (MpegEncContext *s)
static int get_qscale (MpegEncContext *s)
static int mpeg_decode_mb (MpegEncContext *s, int16_t block[12][64])
static av_cold int mpeg_decode_init (AVCodecContext *avctx)
static int mpeg_decode_update_thread_context (AVCodecContext *avctx, const AVCodecContext *avctx_from)
static void quant_matrix_rebuild (uint16_t *matrix, const uint8_t *old_perm, const uint8_t *new_perm)
static enum AVPixelFormat mpeg_get_pixelformat (AVCodecContext *avctx)
static int mpeg_decode_postinit (AVCodecContext *avctx)
static int mpeg1_decode_picture (AVCodecContext *avctx, const uint8_t *buf, int buf_size)
static void mpeg_decode_sequence_extension (Mpeg1Context *s1)
static void mpeg_decode_sequence_display_extension (Mpeg1Context *s1)
static void mpeg_decode_picture_display_extension (Mpeg1Context *s1)
static int load_matrix (MpegEncContext *s, uint16_t matrix0[64], uint16_t matrix1[64], int intra)
static void mpeg_decode_quant_matrix_extension (MpegEncContext *s)
static void mpeg_decode_picture_coding_extension (Mpeg1Context *s1)
static int mpeg_field_start (MpegEncContext *s, const uint8_t *buf, int buf_size)
static int mpeg_decode_slice (MpegEncContext *s, int mb_y, const uint8_t **buf, int buf_size)
 Decode a slice.
static int slice_decode_thread (AVCodecContext *c, void *arg)
static int slice_end (AVCodecContext *avctx, AVFrame *pict)
 Handle slice ends.
static int mpeg1_decode_sequence (AVCodecContext *avctx, const uint8_t *buf, int buf_size)
static int vcr2_init_sequence (AVCodecContext *avctx)
static int mpeg_decode_a53_cc (AVCodecContext *avctx, const uint8_t *p, int buf_size)
static void mpeg_decode_user_data (AVCodecContext *avctx, const uint8_t *p, int buf_size)
static void mpeg_decode_gop (AVCodecContext *avctx, const uint8_t *buf, int buf_size)
static int decode_chunks (AVCodecContext *avctx, AVFrame *picture, int *got_output, const uint8_t *buf, int buf_size)
static int mpeg_decode_frame (AVCodecContext *avctx, void *data, int *got_output, AVPacket *avpkt)
static void flush (AVCodecContext *avctx)
static av_cold int mpeg_decode_end (AVCodecContext *avctx)

Variables

static const uint32_t ptype2mb_type [7]
static const uint32_t btype2mb_type [11]
static const uint8_t non_linear_qscale [32]
static enum AVPixelFormat mpeg12_hwaccel_pixfmt_list_420 []
static const AVProfile mpeg2_video_profiles []
AVCodec ff_mpeg1video_decoder
AVCodec ff_mpeg2video_decoder

Detailed Description

MPEG-1/2 decoder.

Definition in file mpeg12dec.c.

Macro Definition Documentation

#define MB_TYPE_ZERO_MV   0x20000000

Definition at line 63 of file mpeg12dec.c.

Referenced by mpeg_decode_mb().

#define check_scantable_index (   ctx,
  x 
)
Value:
do { \
if ((x) > 63) { \
av_log(ctx->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", \
ctx->mb_x, ctx->mb_y); \
return AVERROR_INVALIDDATA; \
} \
} while (0)

Definition at line 123 of file mpeg12dec.c.

Referenced by mpeg1_decode_block_inter(), mpeg1_decode_block_intra(), mpeg1_fast_decode_block_inter(), mpeg2_decode_block_intra(), mpeg2_decode_block_non_intra(), mpeg2_fast_decode_block_intra(), and mpeg2_fast_decode_block_non_intra().

#define MT_FIELD   1

Definition at line 699 of file mpeg12dec.c.

Referenced by mpeg_decode_mb().

#define MT_FRAME   2

Definition at line 700 of file mpeg12dec.c.

Referenced by mpeg_decode_mb().

#define MT_16X8   2

Definition at line 701 of file mpeg12dec.c.

#define MT_DMV   3

Definition at line 702 of file mpeg12dec.c.

Referenced by mpeg_decode_mb().

#define DECODE_SLICE_ERROR   -1

Definition at line 1671 of file mpeg12dec.c.

Referenced by mpeg_decode_slice().

#define DECODE_SLICE_OK   0

Definition at line 1672 of file mpeg12dec.c.

Referenced by mpeg_decode_slice().

Function Documentation

static int mpeg_decode_motion ( MpegEncContext *  s,
int  fcode,
int  pred 
)
static

Definition at line 97 of file mpeg12dec.c.

Referenced by mpeg_decode_mb().

static int mpeg1_decode_block_intra ( MpegEncContext *  s,
int16_t *  block,
int  n 
)
inlinestatic

Definition at line 132 of file mpeg12dec.c.

Referenced by ff_mpeg1_decode_block_intra(), and mpeg_decode_mb().

int ff_mpeg1_decode_block_intra ( MpegEncContext *  s,
int16_t *  block,
int  n 
)

Definition at line 208 of file mpeg12dec.c.

Referenced by tqi_decode_mb().

static int mpeg1_decode_block_inter ( MpegEncContext *  s,
int16_t *  block,
int  n 
)
inlinestatic

Definition at line 213 of file mpeg12dec.c.

Referenced by mpeg_decode_mb().

static int mpeg1_fast_decode_block_inter ( MpegEncContext *  s,
int16_t *  block,
int  n 
)
inlinestatic

Definition at line 293 of file mpeg12dec.c.

Referenced by mpeg_decode_mb().

static int mpeg2_decode_block_non_intra ( MpegEncContext *  s,
int16_t *  block,
int  n 
)
inlinestatic

Definition at line 373 of file mpeg12dec.c.

Referenced by mpeg_decode_mb().

static int mpeg2_fast_decode_block_non_intra ( MpegEncContext *  s,
int16_t *  block,
int  n 
)
inlinestatic

Definition at line 455 of file mpeg12dec.c.

Referenced by mpeg_decode_mb().

static int mpeg2_decode_block_intra ( MpegEncContext *  s,
int16_t *  block,
int  n 
)
inlinestatic

Definition at line 521 of file mpeg12dec.c.

Referenced by mpeg_decode_mb().

static int mpeg2_fast_decode_block_intra ( MpegEncContext *  s,
int16_t *  block,
int  n 
)
inlinestatic

Definition at line 602 of file mpeg12dec.c.

Referenced by mpeg_decode_mb().

static int get_dmv ( MpegEncContext *  s)
inlinestatic

Definition at line 681 of file mpeg12dec.c.

Referenced by mpeg_decode_mb().

static int get_qscale ( MpegEncContext *  s)
inlinestatic

Definition at line 689 of file mpeg12dec.c.

Referenced by mpeg_decode_mb(), and mpeg_decode_slice().

static int mpeg_decode_mb ( MpegEncContext *  s,
int16_t  block[12][64] 
)
static

Definition at line 704 of file mpeg12dec.c.

Referenced by mpeg_decode_slice().

static av_cold int mpeg_decode_init ( AVCodecContext *  avctx)
static

Definition at line 1090 of file mpeg12dec.c.

static int mpeg_decode_update_thread_context ( AVCodecContext *  avctx,
const AVCodecContext *  avctx_from 
)
static

Definition at line 1121 of file mpeg12dec.c.

static void quant_matrix_rebuild ( uint16_t *  matrix,
const uint8_t *  old_perm,
const uint8_t *  new_perm 
)
static

Definition at line 1146 of file mpeg12dec.c.

static enum AVPixelFormat mpeg_get_pixelformat ( AVCodecContext *  avctx)
static

Definition at line 1180 of file mpeg12dec.c.

Referenced by vcr2_init_sequence().

static int mpeg_decode_postinit ( AVCodecContext *  avctx)
static

Definition at line 1202 of file mpeg12dec.c.

Referenced by decode_chunks().

static int mpeg1_decode_picture ( AVCodecContext *  avctx,
const uint8_t *  buf,
int  buf_size 
)
static

Definition at line 1322 of file mpeg12dec.c.

Referenced by decode_chunks().

static void mpeg_decode_sequence_extension ( Mpeg1Context *  s1)
static

Definition at line 1366 of file mpeg12dec.c.

Referenced by decode_chunks().

static void mpeg_decode_sequence_display_extension ( Mpeg1Context *  s1)
static

Definition at line 1403 of file mpeg12dec.c.

Referenced by decode_chunks().

static void mpeg_decode_picture_display_extension ( Mpeg1Context *  s1)
static

Definition at line 1427 of file mpeg12dec.c.

Referenced by decode_chunks().

static int load_matrix ( MpegEncContext *  s,
uint16_t  matrix0[64],
uint16_t  matrix1[64],
int  intra 
)
static

Definition at line 1460 of file mpeg12dec.c.

Referenced by mpeg1_decode_sequence(), and mpeg_decode_quant_matrix_extension().

static void mpeg_decode_quant_matrix_extension ( MpegEncContext *  s)
static

Definition at line 1483 of file mpeg12dec.c.

Referenced by decode_chunks().

static void mpeg_decode_picture_coding_extension ( Mpeg1Context *  s1)
static

Definition at line 1497 of file mpeg12dec.c.

Referenced by decode_chunks().

static int mpeg_field_start ( MpegEncContext *  s,
const uint8_t *  buf,
int  buf_size 
)
static

Definition at line 1577 of file mpeg12dec.c.

Referenced by decode_chunks().

static int mpeg_decode_slice ( MpegEncContext *  s,
int  mb_y,
const uint8_t **  buf,
int  buf_size 
)
static

Decode a slice.

MpegEncContext.mb_y must be set to the MB row from the startcode.

Returns
DECODE_SLICE_ERROR if the slice is damaged, DECODE_SLICE_OK if this slice is OK

Definition at line 1680 of file mpeg12dec.c.

Referenced by decode_chunks(), and slice_decode_thread().

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

Definition at line 1925 of file mpeg12dec.c.

Referenced by decode_chunks().

static int slice_end ( AVCodecContext *  avctx,
AVFrame *  pict 
)
static

Handle slice ends.

Returns
1 if it seems to be the last slice

Definition at line 1973 of file mpeg12dec.c.

Referenced by decode_chunks(), decode_frame(), filter_slice(), filter_slice_chroma(), and filter_slice_luma().

static int mpeg1_decode_sequence ( AVCodecContext *  avctx,
const uint8_t *  buf,
int  buf_size 
)
static

Definition at line 2026 of file mpeg12dec.c.

Referenced by decode_chunks().

static int vcr2_init_sequence ( AVCodecContext *  avctx)
static

Definition at line 2108 of file mpeg12dec.c.

Referenced by mpeg_decode_frame().

static int mpeg_decode_a53_cc ( AVCodecContext *  avctx,
const uint8_t *  p,
int  buf_size 
)
static

Definition at line 2162 of file mpeg12dec.c.

Referenced by mpeg_decode_user_data().

static void mpeg_decode_user_data ( AVCodecContext *  avctx,
const uint8_t *  p,
int  buf_size 
)
static

Definition at line 2215 of file mpeg12dec.c.

Referenced by decode_chunks().

static void mpeg_decode_gop ( AVCodecContext *  avctx,
const uint8_t *  buf,
int  buf_size 
)
static

Definition at line 2268 of file mpeg12dec.c.

Referenced by decode_chunks().

static int decode_chunks ( AVCodecContext *  avctx,
AVFrame *  picture,
int *  got_output,
const uint8_t *  buf,
int  buf_size 
)
static

Definition at line 2301 of file mpeg12dec.c.

Referenced by mpeg_decode_frame().

static int mpeg_decode_frame ( AVCodecContext *  avctx,
void *  data,
int *  got_output,
AVPacket *  avpkt 
)
static

Definition at line 2567 of file mpeg12dec.c.

static void flush ( AVCodecContext *  avctx)
static

Definition at line 2616 of file mpeg12dec.c.

static av_cold int mpeg_decode_end ( AVCodecContext *  avctx)
static

Definition at line 2626 of file mpeg12dec.c.

Variable Documentation

const uint32_t ptype2mb_type[7]
static
Initial value:
{
MB_TYPE_INTRA,
MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
MB_TYPE_L0,
MB_TYPE_L0 | MB_TYPE_CBP,
MB_TYPE_QUANT | MB_TYPE_INTRA,
MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP,
}

Definition at line 65 of file mpeg12dec.c.

Referenced by mpeg_decode_mb().

const uint32_t btype2mb_type[11]
static
Initial value:
{
MB_TYPE_INTRA,
MB_TYPE_L1,
MB_TYPE_L1 | MB_TYPE_CBP,
MB_TYPE_L0,
MB_TYPE_L0 | MB_TYPE_CBP,
MB_TYPE_L0L1,
MB_TYPE_L0L1 | MB_TYPE_CBP,
MB_TYPE_QUANT | MB_TYPE_INTRA,
MB_TYPE_QUANT | MB_TYPE_L1 | MB_TYPE_CBP,
MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP,
MB_TYPE_QUANT | MB_TYPE_L0L1 | MB_TYPE_CBP,
}

Definition at line 75 of file mpeg12dec.c.

Referenced by mpeg_decode_mb().

const uint8_t non_linear_qscale[32]
static
Initial value:
{
0, 1, 2, 3, 4, 5, 6, 7,
8, 10, 12, 14, 16, 18, 20, 22,
24, 28, 32, 36, 40, 44, 48, 52,
56, 64, 72, 80, 88, 96, 104, 112,
}

Definition at line 89 of file mpeg12dec.c.

Referenced by get_qscale().

enum AVPixelFormat mpeg12_hwaccel_pixfmt_list_420[]
static
Initial value:
{
AV_PIX_FMT_YUV420P,
AV_PIX_FMT_NONE
}

Definition at line 1166 of file mpeg12dec.c.

Referenced by mpeg_get_pixelformat().

const AVProfile mpeg2_video_profiles[]
static
Initial value:
{
{ FF_PROFILE_MPEG2_422, "4:2:2" },
{ FF_PROFILE_MPEG2_HIGH, "High" },
{ FF_PROFILE_MPEG2_SS, "Spatially Scalable" },
{ FF_PROFILE_MPEG2_SNR_SCALABLE, "SNR Scalable" },
{ FF_PROFILE_MPEG2_MAIN, "Main" },
{ FF_PROFILE_MPEG2_SIMPLE, "Simple" },
{ FF_PROFILE_RESERVED, "Reserved" },
{ FF_PROFILE_RESERVED, "Reserved" },
{ FF_PROFILE_UNKNOWN },
}

Definition at line 2636 of file mpeg12dec.c.

AVCodec ff_mpeg1video_decoder
Initial value:
{
.name = "mpeg1video",
.long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_MPEG1VIDEO,
.priv_data_size = sizeof(Mpeg1Context),
.init = mpeg_decode_init,
.close = mpeg_decode_end,
.decode = mpeg_decode_frame,
.capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
CODEC_CAP_SLICE_THREADS,
.flush = flush,
.update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context)
}

Definition at line 2648 of file mpeg12dec.c.

AVCodec ff_mpeg2video_decoder
Initial value:
{
.name = "mpeg2video",
.long_name = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_MPEG2VIDEO,
.priv_data_size = sizeof(Mpeg1Context),
.init = mpeg_decode_init,
.close = mpeg_decode_end,
.decode = mpeg_decode_frame,
.capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
CODEC_CAP_SLICE_THREADS,
.flush = flush,
.profiles = NULL_IF_CONFIG_SMALL(mpeg2_video_profiles),
}

Definition at line 2664 of file mpeg12dec.c.

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