hvirtual/quicktime/ffmpeg/libavcodec/h261.c File Reference

#include "common.h"
#include "dsputil.h"
#include "avcodec.h"
#include "mpegvideo.h"
#include "h261data.h"

Include dependency graph for h261.c:

Go to the source code of this file.

Data Structures

struct  H261Context

Defines

#define H261_MBA_VLC_BITS   9
#define H261_MTYPE_VLC_BITS   6
#define H261_MV_VLC_BITS   7
#define H261_CBP_VLC_BITS   9
#define TCOEFF_VLC_BITS   9
#define MBA_STUFFING   33
#define MBA_STARTCODE   34
#define IS_FIL(a)   ((a)&MB_TYPE_H261_FIL)

Functions

void ff_h261_loop_filter (MpegEncContext *s)
static int ff_h261_get_picture_format (int width, int height)
static void h261_encode_block (H261Context *h, DCTELEM *block, int n)
static int h261_decode_block (H261Context *h, DCTELEM *block, int n, int coded)
void ff_h261_encode_picture_header (MpegEncContext *s, int picture_number)
static void h261_encode_gob_header (MpegEncContext *s, int mb_line)
void ff_h261_reorder_mb_index (MpegEncContext *s)
static void h261_encode_motion (H261Context *h, int val)
static int get_cbp (MpegEncContext *s, DCTELEM block[6][64])
void ff_h261_encode_mb (MpegEncContext *s, DCTELEM block[6][64], int motion_x, int motion_y)
void ff_h261_encode_init (MpegEncContext *s)
void init_vlc_rl (RLTable *rl, int use_static)
static void h261_decode_init_vlc (H261Context *h)
static int h261_decode_init (AVCodecContext *avctx)
static int h261_decode_gob_header (H261Context *h)
static int ff_h261_resync (H261Context *h)
static int h261_decode_mb_skipped (H261Context *h, int mba1, int mba2)
static int decode_mv_component (GetBitContext *gb, int v)
static int h261_decode_mb (H261Context *h)
int h261_decode_picture_header (H261Context *h)
static int h261_decode_gob (H261Context *h)
static int h261_find_frame_end (ParseContext *pc, AVCodecContext *avctx, const uint8_t *buf, int buf_size)
static int h261_parse (AVCodecParserContext *s, AVCodecContext *avctx, uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size)
static int get_consumed_bytes (MpegEncContext *s, int buf_size)
static int h261_decode_frame (AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size)
static int h261_decode_end (AVCodecContext *avctx)

Variables

static VLC h261_mba_vlc
static VLC h261_mtype_vlc
static VLC h261_mv_vlc
static VLC h261_cbp_vlc
AVCodec h261_decoder
AVCodecParser h261_parser

Detailed Description

h261codec.

Definition in file h261.c.

Define Documentation

#define H261_CBP_VLC_BITS   9

Definition at line 36 of file h261.c.

Referenced by h261_decode_init_vlc(), and h261_decode_mb().

#define H261_MBA_VLC_BITS   9

Definition at line 33 of file h261.c.

Referenced by h261_decode_init_vlc(), and h261_decode_mb().

#define H261_MTYPE_VLC_BITS   6

Definition at line 34 of file h261.c.

Referenced by h261_decode_init_vlc(), and h261_decode_mb().

#define H261_MV_VLC_BITS   7

Definition at line 35 of file h261.c.

Referenced by decode_mv_component(), and h261_decode_init_vlc().

#define IS_FIL ( a   )     ((a)&MB_TYPE_H261_FIL)

Definition at line 41 of file h261.c.

Referenced by ff_h261_loop_filter().

#define MBA_STARTCODE   34

Definition at line 40 of file h261.c.

Referenced by h261_decode_mb().

#define MBA_STUFFING   33

Definition at line 39 of file h261.c.

Referenced by h261_decode_gob(), and h261_decode_mb().

#define TCOEFF_VLC_BITS   9

Definition at line 37 of file h261.c.

Referenced by h261_decode_block().

Function Documentation

static int decode_mv_component ( GetBitContext *  gb,
int  v 
) [static]

Definition at line 552 of file h261.c.

References get_bits1(), get_vlc2(), H261_MV_VLC_BITS, mvmap, and VLC::table.

Referenced by h261_decode_mb().

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void ff_h261_encode_init ( MpegEncContext *  s  ) 

Definition at line 280 of file h261.c.

References MpegEncContext::c_dc_scale_table, ff_mpeg1_dc_scale_table, h261_rl_tcoeff, init_rl(), MpegEncContext::max_qcoeff, MpegEncContext::min_qcoeff, and MpegEncContext::y_dc_scale_table.

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void ff_h261_encode_mb ( MpegEncContext *  s,
DCTELEM  block[6][64],
int  motion_x,
int  motion_y 
)

Definition at line 199 of file h261.c.

References H261Context::current_mba, H261Context::current_mv_x, H261Context::current_mv_y, MpegEncContext::dquant, ff_set_qscale(), get_cbp(), h261_cbp_tab, h261_encode_block(), h261_encode_motion(), h261_mba_bits, h261_mba_code, h261_mtype_bits, h261_mtype_code, h261_mtype_map, HAS_CBP, IS_16X16, IS_QUANT, MpegEncContext::loop_filter, MpegEncContext::mb_intra, H261Context::mtype, MpegEncContext::pb, H261Context::previous_mba, put_bits(), MpegEncContext::qscale, and MpegEncContext::skip_count.

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void ff_h261_encode_picture_header ( MpegEncContext *  s,
int  picture_number 
)

Definition at line 95 of file h261.c.

References align_put_bits(), MpegEncContext::avctx, H261Context::current_mba, AVRational::den, ff_h261_get_picture_format(), H261Context::gob_number, MpegEncContext::height, AVRational::num, MpegEncContext::pb, pbBufPtr(), MpegEncContext::picture_number, MpegEncContext::ptr_lastgob, put_bits(), AVCodecContext::time_base, and MpegEncContext::width.

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static int ff_h261_get_picture_format ( int  width,
int  height 
) [static]

Definition at line 78 of file h261.c.

Referenced by ff_h261_encode_picture_header(), ff_h261_reorder_mb_index(), and h261_encode_gob_header().

void ff_h261_loop_filter ( MpegEncContext *  s  ) 

Definition at line 59 of file h261.c.

References MpegEncContext::dest, MpegEncContext::dsp, DSPContext::h261_loop_filter, IS_FIL, MpegEncContext::linesize, H261Context::mtype, and MpegEncContext::uvlinesize.

Referenced by mpeg_motion().

void ff_h261_reorder_mb_index ( MpegEncContext *  s  ) 

Definition at line 150 of file h261.c.

References ff_h261_get_picture_format(), ff_init_block_index(), ff_update_block_index(), h261_encode_gob_header(), MpegEncContext::height, MpegEncContext::mb_width, MpegEncContext::mb_x, MpegEncContext::mb_y, and MpegEncContext::width.

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static int ff_h261_resync ( H261Context *  h  )  [static]

decodes the group of blocks / video packet header.

Returns:
<0 if no resync found

Definition at line 478 of file h261.c.

References align_get_bits(), MpegEncContext::gb, get_bits_count(), H261Context::gob_start_code_skipped, h261_decode_gob_header(), MpegEncContext::last_resync_gb, H261Context::s, s, show_bits(), GetBitContext::size_in_bits, and skip_bits().

Referenced by h261_decode_frame().

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static int get_cbp ( MpegEncContext *  s,
DCTELEM  block[6][64] 
) [inline, static]

Definition at line 188 of file h261.c.

References MpegEncContext::block_last_index.

Referenced by ff_h261_encode_mb().

static int get_consumed_bytes ( MpegEncContext *  s,
int  buf_size 
) [static]

returns the number of bytes consumed for building the current frame

Definition at line 906 of file h261.c.

References MpegEncContext::gb, and get_bits_count().

Referenced by decode_frame(), ff_h263_decode_frame(), and h261_decode_frame().

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static int h261_decode_block ( H261Context *  h,
DCTELEM *  block,
int  n,
int  coded 
) [static]

decodes a macroblock

Returns:
<0 if an error occured

Definition at line 683 of file h261.c.

References av_log(), AV_LOG_ERROR, MpegEncContext::avctx, MpegEncContext::block_last_index, check, MpegEncContext::gb, get_bits(), get_bits1(), get_sbits(), get_vlc2(), h261_rl_tcoeff, MpegEncContext::intra_scantable, level, MpegEncContext::mb_intra, MpegEncContext::mb_x, MpegEncContext::mb_y, RLTable::n, ScanTable::permutated, run, H261Context::s, s, show_bits(), skip_bits(), VLC::table, RLTable::table_level, RLTable::table_run, TCOEFF_VLC_BITS, and RLTable::vlc.

Referenced by h261_decode_mb().

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static int h261_decode_end ( AVCodecContext *  avctx  )  [static]

Definition at line 1008 of file h261.c.

References MPV_common_end(), AVCodecContext::priv_data, H261Context::s, and s.

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static int h261_decode_frame ( AVCodecContext *  avctx,
void *  data,
int *  data_size,
uint8_t *  buf,
int  buf_size 
) [static]

Definition at line 914 of file h261.c.

References av_log(), AV_LOG_ERROR, avcodec_set_dimensions(), MpegEncContext::avctx, AVDISCARD_ALL, AVDISCARD_NONKEY, AVDISCARD_NONREF, B_TYPE, ParseContext::buffer, AVCodecContext::coded_height, AVCodecContext::coded_width, MpegEncContext::context_initialized, MpegEncContext::current_picture, MpegEncContext::current_picture_ptr, ff_er_frame_start(), ff_find_unused_picture(), ff_h261_resync(), ff_print_debug_info(), AVCodecContext::flags, MpegEncContext::flags, AVCodecContext::flags2, MpegEncContext::flags2, AVCodecContext::frame_number, MpegEncContext::gb, get_consumed_bytes(), H261Context::gob_number, H261Context::gob_start_code_skipped, h261_decode_gob(), h261_decode_picture_header(), MpegEncContext::height, AVCodecContext::hurry_up, I_TYPE, init_get_bits(), MpegEncContext::mb_height, MpegEncContext::mb_x, MpegEncContext::mb_y, MPV_common_end(), MPV_common_init(), MPV_frame_end(), MPV_frame_start(), NULL, MpegEncContext::parse_context, MpegEncContext::pict_type, MpegEncContext::picture, MpegEncContext::picture_number, AVCodecContext::priv_data, H261Context::s, s, AVCodecContext::skip_frame, and MpegEncContext::width.

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static int h261_decode_gob ( H261Context *  h  )  [static]

Definition at line 823 of file h261.c.

References av_log(), AV_LOG_ERROR, MpegEncContext::avctx, H261Context::current_mba, ff_set_qscale(), h261_decode_mb(), h261_decode_mb_skipped(), MpegEncContext::mb_stride, MpegEncContext::mb_x, MpegEncContext::mb_y, H261Context::mba_diff, MBA_STUFFING, MpegEncContext::qscale, H261Context::s, s, and SLICE_END.

Referenced by h261_decode_frame().

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static int h261_decode_gob_header ( H261Context *  h  )  [static]

decodes the group of blocks header or slice header.

Returns:
<0 if an error occured

Definition at line 428 of file h261.c.

References H261Context::current_mba, MpegEncContext::gb, get_bits(), get_bits1(), H261Context::gob_number, H261Context::gob_start_code_skipped, MpegEncContext::mb_height, H261Context::mba_diff, MpegEncContext::qscale, H261Context::s, s, show_bits(), and skip_bits().

Referenced by ff_h261_resync().

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static int h261_decode_init ( AVCodecContext *  avctx  )  [static]

Definition at line 399 of file h261.c.

References MpegEncContext::avctx, AVCodecContext::codec, MpegEncContext::codec_id, AVCodecContext::coded_height, AVCodecContext::coded_width, FMT_H261, H261Context::gob_start_code_skipped, h261_decode_init_vlc(), MpegEncContext::height, AVCodec::id, MpegEncContext::low_delay, MPV_decode_defaults(), MpegEncContext::out_format, AVCodecContext::pix_fmt, PIX_FMT_YUV420P, AVCodecContext::priv_data, H261Context::s, s, and MpegEncContext::width.

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static void h261_decode_init_vlc ( H261Context *  h  )  [static]

Definition at line 377 of file h261.c.

References h261_cbp_tab, H261_CBP_VLC_BITS, h261_mba_bits, h261_mba_code, H261_MBA_VLC_BITS, h261_mtype_bits, h261_mtype_code, H261_MTYPE_VLC_BITS, h261_mv_tab, H261_MV_VLC_BITS, h261_rl_tcoeff, init_rl(), init_vlc(), and init_vlc_rl().

Referenced by h261_decode_init().

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static int h261_decode_mb ( H261Context *  h  )  [static]

Definition at line 571 of file h261.c.

References av_log(), AV_LOG_ERROR, MpegEncContext::avctx, MpegEncContext::block, MpegEncContext::block_last_index, DSPContext::clear_blocks, H261Context::current_mba, H261Context::current_mv_x, H261Context::current_mv_y, MpegEncContext::current_picture, decode_mv_component(), MpegEncContext::dsp, ff_init_block_index(), ff_set_qscale(), ff_update_block_index(), MpegEncContext::gb, get_bits(), get_bits_count(), get_vlc2(), H261Context::gob_number, H261Context::gob_start_code_skipped, H261_CBP_VLC_BITS, h261_decode_block(), H261_MBA_VLC_BITS, h261_mtype_map, H261_MTYPE_VLC_BITS, HAS_CBP, IS_16X16, IS_INTRA4x4, IS_QUANT, MpegEncContext::mb_intra, MpegEncContext::mb_stride, MB_TYPE_16x16, MB_TYPE_INTRA, MB_TYPE_L0, MpegEncContext::mb_x, MpegEncContext::mb_y, H261Context::mba_diff, MBA_STARTCODE, MBA_STUFFING, MPV_decode_mb(), H261Context::mtype, MpegEncContext::mv, MpegEncContext::mv_dir, MV_DIR_FORWARD, MpegEncContext::mv_type, MV_TYPE_16X16, H261Context::s, s, GetBitContext::size_in_bits, SLICE_END, SLICE_ERROR, SLICE_OK, and VLC::table.

Referenced by h261_decode_gob().

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static int h261_decode_mb_skipped ( H261Context *  h,
int  mba1,
int  mba2 
) [static]

decodes skipped macroblocks

Returns:
0

Definition at line 519 of file h261.c.

References MpegEncContext::block, MpegEncContext::block_last_index, MpegEncContext::current_picture, ff_init_block_index(), ff_update_block_index(), H261Context::gob_number, MpegEncContext::mb_intra, MpegEncContext::mb_skipped, MpegEncContext::mb_stride, MB_TYPE_16x16, MB_TYPE_H261_FIL, MB_TYPE_L0, MB_TYPE_SKIP, MpegEncContext::mb_x, MpegEncContext::mb_y, MPV_decode_mb(), H261Context::mtype, MpegEncContext::mv, MpegEncContext::mv_dir, MV_DIR_FORWARD, MpegEncContext::mv_type, MV_TYPE_16X16, H261Context::s, and s.

Referenced by h261_decode_gob().

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int h261_decode_picture_header ( H261Context *  h  ) 

decodes the H261 picture header.

Returns:
<0 if no startcode found

Definition at line 765 of file h261.c.

References av_log(), AV_LOG_ERROR, MpegEncContext::avctx, MpegEncContext::gb, get_bits(), get_bits1(), get_bits_count(), H261Context::gob_number, MpegEncContext::height, MpegEncContext::mb_height, MpegEncContext::mb_num, MpegEncContext::mb_width, P_TYPE, MpegEncContext::pict_type, MpegEncContext::picture_number, H261Context::s, s, GetBitContext::size_in_bits, skip_bits(), skip_bits1(), and MpegEncContext::width.

Referenced by h261_decode_frame().

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static void h261_encode_block ( H261Context *  h,
DCTELEM *  block,
int  n 
) [static]

encodes a 8x8 block.

Parameters:
block the 8x8 block
n block index (0-3 are luma, 4-5 are chroma)

Definition at line 300 of file h261.c.

References MpegEncContext::block_last_index, get_rl_index(), h261_rl_tcoeff, MpegEncContext::intra_scantable, level, MpegEncContext::mb_intra, RLTable::n, MpegEncContext::pb, ScanTable::permutated, put_bits(), run, H261Context::s, s, and RLTable::table_vlc.

Referenced by ff_h261_encode_mb().

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static void h261_encode_gob_header ( MpegEncContext *  s,
int  mb_line 
) [static]

Encodes a group of blocks header.

Definition at line 132 of file h261.c.

References H261Context::current_mba, H261Context::current_mv_x, H261Context::current_mv_y, ff_h261_get_picture_format(), H261Context::gob_number, MpegEncContext::height, MpegEncContext::pb, H261Context::previous_mba, put_bits(), MpegEncContext::qscale, and MpegEncContext::width.

Referenced by ff_h261_reorder_mb_index().

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static void h261_encode_motion ( H261Context *  h,
int  val 
) [static]

Definition at line 169 of file h261.c.

References h261_mv_tab, MpegEncContext::pb, put_bits(), H261Context::s, and s.

Referenced by ff_h261_encode_mb().

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static int h261_find_frame_end ( ParseContext *  pc,
AVCodecContext *  avctx,
const uint8_t *  buf,
int  buf_size 
) [static]

Definition at line 849 of file h261.c.

References END_NOT_FOUND, ParseContext::frame_start_found, and ParseContext::state.

Referenced by h261_parse().

static int h261_parse ( AVCodecParserContext *  s,
AVCodecContext *  avctx,
uint8_t **  poutbuf,
int *  poutbuf_size,
const uint8_t *  buf,
int  buf_size 
) [static]

Definition at line 884 of file h261.c.

References ff_combine_frame(), h261_find_frame_end(), NULL, and AVCodecParserContext::priv_data.

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void init_vlc_rl ( RLTable *  rl,
int  use_static 
)

Definition at line 2865 of file h263.c.

Referenced by ff_msmpeg4_decode_init(), h261_decode_init_vlc(), and h263_decode_init_vlc().

Variable Documentation

VLC h261_cbp_vlc [static]

Definition at line 373 of file h261.c.

AVCodec h261_decoder

Initial value:

 {
    "h261",
    CODEC_TYPE_VIDEO,
    CODEC_ID_H261,
    sizeof(H261Context),
    h261_decode_init,
    NULL,
    h261_decode_end,
    h261_decode_frame,
    CODEC_CAP_DR1,
}

Definition at line 1029 of file h261.c.

Referenced by avcodec_register_all().

VLC h261_mba_vlc [static]

Definition at line 370 of file h261.c.

VLC h261_mtype_vlc [static]

Definition at line 371 of file h261.c.

VLC h261_mv_vlc [static]

Definition at line 372 of file h261.c.

AVCodecParser h261_parser

Initial value:

 {
    { CODEC_ID_H261 },
    sizeof(ParseContext),
    NULL,
    h261_parse,
    ff_parse_close,
}

Definition at line 1041 of file h261.c.

Referenced by avcodec_register_all().

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