ivi_common.c File Reference

This file contains functions and data shared by both Indeo4 and Indeo5 decoders. More...

#include "avcodec.h"
#include "get_bits.h"
#include "ivi_common.h"
#include "libavutil/common.h"
#include "ivi_dsp.h"

Go to the source code of this file.

Macros

#define BITSTREAM_READER_LE

Functions

static uint16_t inv_bits (uint16_t val, int nbits)
 Reverse "nbits" bits of the value "val" and return the result in the least significant bits.
int ff_ivi_create_huff_from_desc (const IVIHuffDesc *cb, VLC *vlc, int flag)
 Generate a huffman codebook from the given descriptor and convert it into the Libav VLC table.
void ff_ivi_init_static_vlc (void)
 Initialize static codes used for macroblock and block decoding.
int ff_ivi_dec_huff_desc (GetBitContext *gb, int desc_coded, int which_tab, IVIHuffTab *huff_tab, AVCodecContext *avctx)
 Decode a huffman codebook descriptor from the bitstream and select specified huffman table.
int ff_ivi_huff_desc_cmp (const IVIHuffDesc *desc1, const IVIHuffDesc *desc2)
 Compare two huffman codebook descriptors.
void ff_ivi_huff_desc_copy (IVIHuffDesc *dst, const IVIHuffDesc *src)
 Copy huffman codebook descriptors.
int av_cold ff_ivi_init_planes (IVIPlaneDesc *planes, const IVIPicConfig *cfg)
 Initialize planes (prepares descriptors, allocates buffers etc).
void av_cold ff_ivi_free_buffers (IVIPlaneDesc *planes)
 Free planes, bands and macroblocks buffers.
int av_cold ff_ivi_init_tiles (IVIPlaneDesc *planes, int tile_width, int tile_height)
 Initialize tile and macroblock descriptors.
int ff_ivi_dec_tile_data_size (GetBitContext *gb)
 Decode size of the tile data.
int ff_ivi_decode_blocks (GetBitContext *gb, IVIBandDesc *band, IVITile *tile)
 Decode block data: extract huffman-coded transform coefficients from the bitstream, dequantize them, apply inverse transform and motion compensation in order to reconstruct the picture.
void ff_ivi_process_empty_tile (AVCodecContext *avctx, IVIBandDesc *band, IVITile *tile, int32_t mv_scale)
 Handle empty tiles by performing data copying and motion compensation respectively.
void ff_ivi_output_plane (IVIPlaneDesc *plane, uint8_t *dst, int dst_pitch)
 Convert and output the current plane.

Variables

const IVIHuffDesc ff_ivi_mb_huff_desc [8]
 static macroblock huffman tables
const IVIHuffDesc ff_ivi_blk_huff_desc [8]
 static block huffman tables
VLC ff_ivi_mb_vlc_tabs [8]
 static macroblock Huffman tables
VLC ff_ivi_blk_vlc_tabs [8]
 static block Huffman tables
const uint8_t ff_ivi_vertical_scan_8x8 [64]
 Scan patterns shared between indeo4 and indeo5.
const uint8_t ff_ivi_horizontal_scan_8x8 [64]
const uint8_t ff_ivi_direct_scan_4x4 [16]
const RVMapDesc ff_ivi_rvmap_tabs [9]
 Run-value (RLE) tables.

Detailed Description

This file contains functions and data shared by both Indeo4 and Indeo5 decoders.

Definition in file ivi_common.c.


Macro Definition Documentation

#define BITSTREAM_READER_LE

Definition at line 29 of file ivi_common.c.


Function Documentation

int ff_ivi_create_huff_from_desc ( const IVIHuffDesc cb,
VLC vlc,
int  flag 
)

Generate a huffman codebook from the given descriptor and convert it into the Libav VLC table.

Parameters:
[in]cbpointer to codebook descriptor
[out]vlcwhere to place the generated VLC table
[in]flagflag: 1 - for static or 0 for dynamic tables
Returns:
result code: 0 - OK, -1 = error (invalid codebook descriptor)

Definition at line 58 of file ivi_common.c.

Referenced by ff_ivi_dec_huff_desc(), and ff_ivi_init_static_vlc().

int ff_ivi_dec_huff_desc ( GetBitContext gb,
int  desc_coded,
int  which_tab,
IVIHuffTab huff_tab,
AVCodecContext avctx 
)

Decode a huffman codebook descriptor from the bitstream and select specified huffman table.

Parameters:
[in,out]gbthe GetBit context
[in]desc_codedflag signalling if table descriptor was coded
[in]which_tabcodebook purpose (IVI_MB_HUFF or IVI_BLK_HUFF)
[out]huff_tabpointer to the descriptor of the selected table
[in]avctxAVCodecContext pointer
Returns:
zero on success, negative value otherwise

Definition at line 111 of file ivi_common.c.

Referenced by decode_band_hdr(), and decode_pic_hdr().

int ff_ivi_dec_tile_data_size ( GetBitContext gb)

Decode size of the tile data.

The size is stored as a variable-length field having the following format: if (tile_data_size < 255) than this field is only one byte long if (tile_data_size >= 255) than this field four is byte long: 0xFF X1 X2 X3 where X1-X3 is size of the tile data

Parameters:
[in,out]gbthe GetBit context
Returns:
size of the tile data in bytes

Definition at line 313 of file ivi_common.c.

Referenced by decode_band().

int ff_ivi_decode_blocks ( GetBitContext gb,
IVIBandDesc band,
IVITile tile 
)

Decode block data: extract huffman-coded transform coefficients from the bitstream, dequantize them, apply inverse transform and motion compensation in order to reconstruct the picture.

Parameters:
[in,out]gbthe GetBit context
[in]bandpointer to the band descriptor
[in]tilepointer to the tile descriptor
Returns:
result code: 0 - OK, -1 = error (corrupted blocks data)

Definition at line 330 of file ivi_common.c.

Referenced by decode_band().

void av_cold ff_ivi_free_buffers ( IVIPlaneDesc planes)

Free planes, bands and macroblocks buffers.

Parameters:
[in]planespointer to the array of the plane descriptors

Definition at line 229 of file ivi_common.c.

Referenced by decode_close(), and ff_ivi_init_planes().

int ff_ivi_huff_desc_cmp ( const IVIHuffDesc desc1,
const IVIHuffDesc desc2 
)

Compare two huffman codebook descriptors.

Parameters:
[in]desc1ptr to the 1st descriptor to compare
[in]desc2ptr to the 2nd descriptor to compare
Returns:
comparison result: 0 - equal, 1 - not equal

Definition at line 155 of file ivi_common.c.

Referenced by ff_ivi_dec_huff_desc().

void ff_ivi_huff_desc_copy ( IVIHuffDesc dst,
const IVIHuffDesc src 
)

Copy huffman codebook descriptors.

Parameters:
[out]dstptr to the destination descriptor
[in]srcptr to the source descriptor

Definition at line 161 of file ivi_common.c.

Referenced by ff_ivi_dec_huff_desc().

int av_cold ff_ivi_init_planes ( IVIPlaneDesc planes,
const IVIPicConfig cfg 
)

Initialize planes (prepares descriptors, allocates buffers etc).

Parameters:
[in,out]planespointer to the array of the plane descriptors
[in]cfgpointer to the ivi_pic_config structure describing picture layout
Returns:
result code: 0 - OK

Definition at line 167 of file ivi_common.c.

Referenced by decode_gop_header(), decode_init(), and decode_pic_hdr().

void ff_ivi_init_static_vlc ( void  )

Initialize static codes used for macroblock and block decoding.

Definition at line 92 of file ivi_common.c.

Referenced by decode_init().

int av_cold ff_ivi_init_tiles ( IVIPlaneDesc planes,
int  tile_width,
int  tile_height 
)

Initialize tile and macroblock descriptors.

Parameters:
[in,out]planespointer to the array of the plane descriptors
[in]tile_widthtile width
[in]tile_heighttile height
Returns:
result code: 0 - OK

Definition at line 249 of file ivi_common.c.

Referenced by decode_gop_header(), and decode_pic_hdr().

void ff_ivi_output_plane ( IVIPlaneDesc plane,
uint8_t *  dst,
int  dst_pitch 
)

Convert and output the current plane.

This conversion is done by adding back the bias value of 128 (subtracted in the encoder) and clipping the result.

Parameters:
[in]planepointer to the descriptor of the plane being processed
[out]dstpointer to the buffer receiving converted pixels
[in]dst_pitchpitch for moving to the next y line

Definition at line 608 of file ivi_common.c.

Referenced by decode_frame().

void ff_ivi_process_empty_tile ( AVCodecContext avctx,
IVIBandDesc band,
IVITile tile,
int32_t  mv_scale 
)

Handle empty tiles by performing data copying and motion compensation respectively.

Parameters:
[in]avctxptr to the AVCodecContext
[in]bandpointer to the band descriptor
[in]tilepointer to the tile descriptor
[in]mv_scalescaling factor for motion vectors

Definition at line 472 of file ivi_common.c.

Referenced by decode_band().

static uint16_t inv_bits ( uint16_t  val,
int  nbits 
)
static

Reverse "nbits" bits of the value "val" and return the result in the least significant bits.

Definition at line 46 of file ivi_common.c.

Referenced by ff_ivi_create_huff_from_desc().


Variable Documentation

const IVIHuffDesc ff_ivi_blk_huff_desc
Initial value:
{
{10, {1, 2, 3, 4, 4, 7, 5, 5, 4, 1}},
{11, {2, 3, 4, 4, 4, 7, 5, 4, 3, 3, 2}},
{12, {2, 4, 5, 5, 5, 5, 6, 4, 4, 3, 1, 1}},
{13, {3, 3, 4, 4, 5, 6, 6, 4, 4, 3, 2, 1, 1}},
{11, {3, 4, 4, 5, 5, 5, 6, 5, 4, 2, 2}},
{13, {3, 4, 5, 5, 5, 5, 6, 4, 3, 3, 2, 1, 1}},
{13, {3, 4, 5, 5, 5, 6, 5, 4, 3, 3, 2, 1, 1}},
{9, {3, 4, 4, 5, 5, 5, 6, 5, 5}}
}

static block huffman tables

Definition at line 643 of file ivi_common.c.

VLC ff_ivi_blk_vlc_tabs[8]

static block Huffman tables

Definition at line 40 of file ivi_common.c.

const uint8_t ff_ivi_direct_scan_4x4[16]
Initial value:
{
0, 1, 4, 8, 5, 2, 3, 6, 9, 12, 13, 10, 7, 11, 14, 15
}

Definition at line 680 of file ivi_common.c.

Referenced by decode_gop_header().

const uint8_t ff_ivi_horizontal_scan_8x8[64]
Initial value:
{
0, 1, 2, 3, 4, 5, 6, 7,
8, 9, 10, 11, 12, 13, 14, 15,
16, 17, 18, 19, 20, 21, 22, 23,
24, 25, 26, 27, 28, 29, 30, 31,
32, 33, 34, 35, 36, 37, 38, 39,
40, 41, 42, 43, 44, 45, 46, 47,
48, 49, 50, 51, 52, 53, 54, 55,
56, 57, 58, 59, 60, 61, 62, 63
}

Definition at line 669 of file ivi_common.c.

Referenced by decode_gop_header().

const IVIHuffDesc ff_ivi_mb_huff_desc
Initial value:
{
{8, {0, 4, 5, 4, 4, 4, 6, 6}},
{12, {0, 2, 2, 3, 3, 3, 3, 5, 3, 2, 2, 2}},
{12, {0, 2, 3, 4, 3, 3, 3, 3, 4, 3, 2, 2}},
{12, {0, 3, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2}},
{13, {0, 4, 4, 3, 3, 3, 3, 2, 3, 3, 2, 1, 1}},
{9, {0, 4, 4, 4, 4, 3, 3, 3, 2}},
{10, {0, 4, 4, 4, 4, 3, 3, 2, 2, 2}},
{12, {0, 4, 4, 4, 3, 3, 2, 3, 2, 2, 2, 2}}
}

static macroblock huffman tables

These are 2x8 predefined Huffman codebooks for coding macroblock/block signals.

They are specified using "huffman descriptors" in order to avoid huge static tables. The decoding tables will be generated at startup from these descriptors.

Definition at line 632 of file ivi_common.c.

VLC ff_ivi_mb_vlc_tabs[8]

static macroblock Huffman tables

Definition at line 39 of file ivi_common.c.

const RVMapDesc ff_ivi_rvmap_tabs[9]

Run-value (RLE) tables.

Definition at line 688 of file ivi_common.c.

Referenced by decode_init().

const uint8_t ff_ivi_vertical_scan_8x8[64]
Initial value:
{
0, 8, 16, 24, 32, 40, 48, 56,
1, 9, 17, 25, 33, 41, 49, 57,
2, 10, 18, 26, 34, 42, 50, 58,
3, 11, 19, 27, 35, 43, 51, 59,
4, 12, 20, 28, 36, 44, 52, 60,
5, 13, 21, 29, 37, 45, 53, 61,
6, 14, 22, 30, 38, 46, 54, 62,
7, 15, 23, 31, 39, 47, 55, 63
}

Scan patterns shared between indeo4 and indeo5.

Common scan patterns (defined in ivi_common.c)

Definition at line 658 of file ivi_common.c.

Referenced by decode_gop_header().