libavcodec/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.

Defines

#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 FFmpeg 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.
static int 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.
static int decode_band (IVI45DecContext *ctx, int plane_num, IVIBandDesc *band, AVCodecContext *avctx)
 Decode an Indeo 4 or 5 band.
int ff_ivi_decode_frame (AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt)
av_cold int ff_ivi_decode_close (AVCodecContext *avctx)
 Close Indeo5 decoder and clean up its context.

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.

Define Documentation

#define BITSTREAM_READER_LE

Definition at line 29 of file ivi_common.c.

Function Documentation

static int decode_band ( IVI45DecContext *  ctx,
int  plane_num,
IVIBandDesc *  band,
AVCodecContext *  avctx 
) [static]

Decode an Indeo 4 or 5 band.

Parameters:
[in,out] ctx ptr to the decoder context
[in,out] band ptr to the band descriptor
[in] avctx ptr to the AVCodecContext
Returns:
result code: 0 = OK, -1 = error

Definition at line 675 of file ivi_common.c.

Referenced by ff_ivi_decode_frame().

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 FFmpeg VLC table.

Parameters:
[in] cb pointer to codebook descriptor
[out] vlc where to place the generated VLC table
[in] flag flag: 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] gb the GetBit context
[in] desc_coded flag signalling if table descriptor was coded
[in] which_tab codebook purpose (IVI_MB_HUFF or IVI_BLK_HUFF)
[out] huff_tab pointer to the descriptor of the selected table
[in] avctx AVCodecContext 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] gb the GetBit context
Returns:
size of the tile data in bytes

Definition at line 322 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] gb the GetBit context
[in] band pointer to the band descriptor
[in] tile pointer to the tile descriptor
Returns:
result code: 0 - OK, -1 = error (corrupted blocks data)

Definition at line 339 of file ivi_common.c.

Referenced by decode_band().

av_cold int ff_ivi_decode_close ( AVCodecContext *  avctx  ) 

Close Indeo5 decoder and clean up its context.

Definition at line 855 of file ivi_common.c.

int ff_ivi_decode_frame ( AVCodecContext *  avctx,
void *  data,
int *  data_size,
AVPacket *  avpkt 
)

Definition at line 769 of file ivi_common.c.

void av_cold ff_ivi_free_buffers ( IVIPlaneDesc *  planes  ) 

Free planes, bands and macroblocks buffers.

Parameters:
[in] planes pointer to the array of the plane descriptors

Definition at line 235 of file ivi_common.c.

Referenced by ff_ivi_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] desc1 ptr to the 1st descriptor to compare
[in] desc2 ptr to the 2nd descriptor to compare
Returns:
comparison result: 0 - equal, 1 - not equal

Definition at line 160 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] dst ptr to the destination descriptor
[in] src ptr to the source descriptor

Definition at line 166 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] planes pointer to the array of the plane descriptors
[in] cfg pointer to the ivi_pic_config structure describing picture layout
Returns:
result code: 0 - OK

Definition at line 172 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] planes pointer to the array of the plane descriptors
[in] tile_width tile width
[in] tile_height tile height
Returns:
result code: 0 - OK

Definition at line 255 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] plane pointer to the descriptor of the plane being processed
[out] dst pointer to the buffer receiving converted pixels
[in] dst_pitch pitch for moving to the next y line

Definition at line 650 of file ivi_common.c.

Referenced by ff_ivi_decode_frame().

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().

static int ivi_process_empty_tile ( AVCodecContext *  avctx,
IVIBandDesc *  band,
IVITile *  tile,
int32_t  mv_scale 
) [static]

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

Parameters:
[in] avctx ptr to the AVCodecContext
[in] band pointer to the band descriptor
[in] tile pointer to the tile descriptor
[in] mv_scale scaling factor for motion vectors

Definition at line 505 of file ivi_common.c.

Referenced by decode_band().

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 905 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 942 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 931 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 894 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 950 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 920 of file ivi_common.c.

Referenced by decode_gop_header().

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