indeo3.c File Reference

This is a decoder for Intel Indeo Video v3. More...

#include "libavutil/imgutils.h"
#include "libavutil/intreadwrite.h"
#include "avcodec.h"
#include "copy_block.h"
#include "bytestream.h"
#include "get_bits.h"
#include "hpeldsp.h"
#include "internal.h"
#include "indeo3data.h"

Classes
struct	Plane
struct	Cell
struct	Indeo3DecodeContext

Macros
#define	BS_8BIT_PEL   (1 << 1)
	8-bit pixel bitdepth indicator
#define	BS_KEYFRAME   (1 << 2)
	intra frame indicator
#define	BS_MV_Y_HALF   (1 << 4)
	vertical mv halfpel resolution indicator
#define	BS_MV_X_HALF   (1 << 5)
	horizontal mv halfpel resolution indicator
#define	BS_NONREF   (1 << 8)
	nonref (discardable) frame indicator
#define	BS_BUFFER   9
	indicates which of two frame buffers should be used
#define	CELL_STACK_MAX   20
#define	AVG_32(dst, src, ref)   AV_WN32A(dst, ((AV_RN32(src) + AV_RN32(ref)) >> 1) & 0x7F7F7F7FUL)
#define	AVG_64(dst, src, ref)   AV_WN64A(dst, ((AV_RN64(src) + AV_RN64(ref)) >> 1) & 0x7F7F7F7F7F7F7F7FULL)
#define	BUFFER_PRECHECK
#define	RLE_BLOCK_COPY
#define	RLE_BLOCK_COPY_8
#define	RLE_LINES_COPY   copy_block4(dst, ref, row_offset, row_offset, num_lines << v_zoom)
#define	RLE_LINES_COPY_M10
#define	APPLY_DELTA_4
#define	APPLY_DELTA_8
#define	APPLY_DELTA_1011_INTER
#define	SPLIT_CELL(size, new_size)   (new_size) = ((size) > 2) ? ((((size) + 2) >> 2) << 1) : 1
#define	UPDATE_BITPOS(n)
#define	RESYNC_BITSTREAM
#define	CHECK_CELL
#define	OS_HDR_ID   MKBETAG('F', 'R', 'M', 'H')

Typedefs
typedef struct Plane	Plane
typedef struct Cell	Cell
typedef struct Indeo3DecodeContext	Indeo3DecodeContext

Enumerations
enum	{   RLE_ESC_F9 = 249, RLE_ESC_FA = 250, RLE_ESC_FB = 251, RLE_ESC_FC = 252,   RLE_ESC_FD = 253, RLE_ESC_FE = 254, RLE_ESC_FF = 255 }
enum	{   IV3_NOERR = 0, IV3_BAD_RLE = 1, IV3_BAD_DATA = 2, IV3_BAD_COUNTER = 3,   IV3_UNSUPPORTED = 4, IV3_OUT_OF_DATA = 5 }
enum	{ H_SPLIT = 0, V_SPLIT = 1, INTRA_NULL = 2, INTER_DATA = 3 }

Variables
AVCodec	ff_indeo3_decoder

Detailed Description

This is a decoder for Intel Indeo Video v3.

It is based on vector quantization, run-length coding and motion compensation. Known container formats: .avi and .mov Known FOURCCs: 'IV31', 'IV32'

See also

http://wiki.multimedia.cx/index.php?title=Indeo_3

Macro Definition Documentation

APPLY_DELTA_1011_INTER

#define APPLY_DELTA_1011_INTER

Value:

if (mode == 10) { \
        AV_WN32A(dst                 , \
                 (AV_RN32(dst                 ) + delta_tab->deltas_m10[dyad1]) & 0x7F7F7F7F);\
        AV_WN32A(dst + 4             , \
                 (AV_RN32(dst + 4             ) + delta_tab->deltas_m10[dyad2]) & 0x7F7F7F7F);\
        AV_WN32A(dst + row_offset    , \
                 (AV_RN32(dst + row_offset    ) + delta_tab->deltas_m10[dyad1]) & 0x7F7F7F7F);\
        AV_WN32A(dst + row_offset + 4, \
                 (AV_RN32(dst + row_offset + 4) + delta_tab->deltas_m10[dyad2]) & 0x7F7F7F7F);\
    } else { \
        AV_WN16A(dst                 , \
                 (AV_RN16(dst                 ) + delta_tab->deltas[dyad1]) & 0x7F7F);\
        AV_WN16A(dst + 2             , \
                 (AV_RN16(dst + 2             ) + delta_tab->deltas[dyad2]) & 0x7F7F);\
        AV_WN16A(dst + row_offset    , \
                 (AV_RN16(dst + row_offset    ) + delta_tab->deltas[dyad1]) & 0x7F7F);\
        AV_WN16A(dst + row_offset + 2, \
                 (AV_RN16(dst + row_offset + 2) + delta_tab->deltas[dyad2]) & 0x7F7F);\
    }

APPLY_DELTA_4

#define APPLY_DELTA_4

Value:

AV_WN16A(dst + line_offset    ,\
             (AV_RN16(ref    ) + delta_tab->deltas[dyad1]) & 0x7F7F);\
    AV_WN16A(dst + line_offset + 2,\
             (AV_RN16(ref + 2) + delta_tab->deltas[dyad2]) & 0x7F7F);\
    if (mode >= 3) {\
        if (is_top_of_cell && !cell->ypos) {\
            AV_COPY32U(dst, dst + row_offset);\
        } else {\
            AVG_32(dst, ref, dst + row_offset);\
        }\
    }

APPLY_DELTA_8

#define APPLY_DELTA_8

Value:

/* apply two 32-bit VQ deltas to next even line */\
    if (is_top_of_cell) { \
        AV_WN32A(dst + row_offset    , \
                 (replicate32(AV_RN32(ref    )) + delta_tab->deltas_m10[dyad1]) & 0x7F7F7F7F);\
        AV_WN32A(dst + row_offset + 4, \
                 (replicate32(AV_RN32(ref + 4)) + delta_tab->deltas_m10[dyad2]) & 0x7F7F7F7F);\
    } else { \
        AV_WN32A(dst + row_offset    , \
                 (AV_RN32(ref    ) + delta_tab->deltas_m10[dyad1]) & 0x7F7F7F7F);\
        AV_WN32A(dst + row_offset + 4, \
                 (AV_RN32(ref + 4) + delta_tab->deltas_m10[dyad2]) & 0x7F7F7F7F);\
    } \
    /* odd lines are not coded but rather interpolated/replicated */\
    /* first line of the cell on the top of image? - replicate */\
    /* otherwise - interpolate */\
    if (is_top_of_cell && !cell->ypos) {\
        AV_COPY64U(dst, dst + row_offset);\
    } else \
        AVG_64(dst, ref, dst + row_offset);

BUFFER_PRECHECK

#define BUFFER_PRECHECK

Value:

if (*data_ptr >= last_ptr) \
    return IV3_OUT_OF_DATA; \

CHECK_CELL

#define CHECK_CELL

Value:

if (curr_cell.xpos + curr_cell.width > (plane->width >> 2) ||               \
        curr_cell.ypos + curr_cell.height > (plane->height >> 2)) {             \
        av_log(avctx, AV_LOG_ERROR, "Invalid cell: x=%d, y=%d, w=%d, h=%d\n",   \
               curr_cell.xpos, curr_cell.ypos, curr_cell.width, curr_cell.height); \
        return AVERROR_INVALIDDATA;                                                              \
    }

RESYNC_BITSTREAM

#define RESYNC_BITSTREAM

Value:

if (ctx->need_resync && !(get_bits_count(&ctx->gb) & 7)) { \
        skip_bits_long(&ctx->gb, ctx->skip_bits);              \
        ctx->skip_bits   = 0;                                  \
        ctx->need_resync = 0;                                  \
    }

RLE_BLOCK_COPY

#define RLE_BLOCK_COPY

Value:

if (cell->mv_ptr || !skip_flag) \
        copy_block4(dst, ref, row_offset, row_offset, 4 << v_zoom)

RLE_BLOCK_COPY_8

#define RLE_BLOCK_COPY_8

Value:

pix64 = AV_RN64(ref);\
    if (is_first_row) {/* special prediction case: top line of a cell */\
        pix64 = replicate64(pix64);\
        fill_64(dst + row_offset, pix64, 7, row_offset);\
        AVG_64(dst, ref, dst + row_offset);\
    } else \
        fill_64(dst, pix64, 8, row_offset)

RLE_LINES_COPY_M10

#define RLE_LINES_COPY_M10

Value:

pix64 = AV_RN64(ref);\
    if (is_top_of_cell) {\
        pix64 = replicate64(pix64);\
        fill_64(dst + row_offset, pix64, (num_lines << 1) - 1, row_offset);\
        AVG_64(dst, ref, dst + row_offset);\
    } else \
        fill_64(dst, pix64, num_lines << 1, row_offset)

UPDATE_BITPOS

#define UPDATE_BITPOS

(

n

)

Value:

ctx->skip_bits  += (n); \
    ctx->need_resync = 1

Enumeration Type Documentation

anonymous enum

anonymous enum

Enumerator
RLE_ESC_F9	same as RLE_ESC_FA + do the same with next block
RLE_ESC_FA	INTRA: skip block, INTER: copy data from reference.
RLE_ESC_FB	apply null delta to N blocks / skip N blocks
RLE_ESC_FC	same as RLE_ESC_FD + do the same with next block
RLE_ESC_FD	apply null delta to all remaining lines of this block
RLE_ESC_FE	apply null delta to all lines up to the 3rd line
RLE_ESC_FF	apply null delta to all lines up to the 2nd line

Variable Documentation

ff_indeo3_decoder

AVCodec ff_indeo3_decoder

Initial value:

= {
    .name           = "indeo3",
    .long_name      = NULL_IF_CONFIG_SMALL("Intel Indeo 3"),
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_INDEO3,
    .priv_data_size = sizeof(Indeo3DecodeContext),
    .init           = decode_init,
    .close          = decode_close,
    .decode         = decode_frame,
    .capabilities   = AV_CODEC_CAP_DR1,
}