ivi_common.c File Reference

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

#include "libavutil/attributes.h"
#include "avcodec.h"
#include "get_bits.h"
#include "internal.h"
#include "mathops.h"
#include "ivi_common.h"
#include "ivi_dsp.h"
Include dependency graph for ivi_common.c:

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. More...
 
static int ivi_create_huff_from_desc (const IVIHuffDesc *cb, VLC *vlc, int flag)
 
void ff_ivi_init_static_vlc (void)
 Initialize static codes used for macroblock and block decoding. More...
 
static void ivi_huff_desc_copy (IVIHuffDesc *dst, const IVIHuffDesc *src)
 
static int ivi_huff_desc_cmp (const IVIHuffDesc *desc1, const IVIHuffDesc *desc2)
 
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. More...
 
static av_cold void ivi_free_buffers (IVIPlaneDesc *planes)
 
av_cold int ff_ivi_init_planes (IVIPlaneDesc *planes, const IVIPicConfig *cfg)
 Initialize planes (prepares descriptors, allocates buffers etc). More...
 
av_cold int ff_ivi_init_tiles (IVIPlaneDesc *planes, int tile_width, int tile_height)
 Initialize tile and macroblock descriptors. More...
 
static int ivi_dec_tile_data_size (GetBitContext *gb)
 
static int ivi_decode_blocks (GetBitContext *gb, IVIBandDesc *band, IVITile *tile, AVCodecContext *avctx)
 
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. More...
 
static void ivi_output_plane (IVIPlaneDesc *plane, uint8_t *dst, int dst_pitch)
 
static int decode_band (IVI45DecContext *ctx, IVIBandDesc *band, AVCodecContext *avctx)
 Decode an Indeo 4 or 5 band. More...
 
int ff_ivi_decode_frame (AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
 
av_cold int ff_ivi_decode_close (AVCodecContext *avctx)
 Close Indeo5 decoder and clean up its context. More...
 

Variables

const IVIHuffDesc ff_ivi_mb_huff_desc [8]
 static macroblock huffman tables More...
 
const IVIHuffDesc ff_ivi_blk_huff_desc [8]
 static block huffman tables More...
 
static VLC ivi_mb_vlc_tabs [8]
 static macroblock Huffman tables More...
 
static VLC ivi_blk_vlc_tabs [8]
 static block Huffman tables More...
 
const uint8_t ff_ivi_vertical_scan_8x8 [64]
 Scan patterns shared between indeo4 and indeo5. More...
 
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. More...
 

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

static int decode_band ( IVI45DecContext ctx,
IVIBandDesc band,
AVCodecContext avctx 
)
static

Decode an Indeo 4 or 5 band.

Parameters
[in,out]ctxptr to the decoder context
[in,out]bandptr to the band descriptor
[in]avctxptr to the AVCodecContext
Returns
result code: 0 = OK, -1 = error

Definition at line 737 of file ivi_common.c.

Referenced by ff_ivi_decode_frame().

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 147 of file ivi_common.c.

Referenced by decode_band_hdr(), decode_pic_hdr(), and ivi_scale_mv().

av_cold int ff_ivi_decode_close ( AVCodecContext avctx)

Close Indeo5 decoder and clean up its context.

Definition at line 931 of file ivi_common.c.

Referenced by ivi_scale_mv().

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

Definition at line 844 of file ivi_common.c.

Referenced by ivi_scale_mv().

av_cold int 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 222 of file ivi_common.c.

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

void ff_ivi_init_static_vlc ( void  )

Initialize static codes used for macroblock and block decoding.

Definition at line 103 of file ivi_common.c.

Referenced by decode_init(), and ivi_scale_mv().

av_cold int 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 286 of file ivi_common.c.

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

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 48 of file ivi_common.c.

Referenced by ivi_create_huff_from_desc().

static int ivi_create_huff_from_desc ( const IVIHuffDesc cb,
VLC vlc,
int  flag 
)
static

Definition at line 69 of file ivi_common.c.

Referenced by ff_ivi_dec_huff_desc(), and ff_ivi_init_static_vlc().

static int ivi_dec_tile_data_size ( GetBitContext gb)
static

Definition at line 366 of file ivi_common.c.

Referenced by decode_band().

static int ivi_decode_blocks ( GetBitContext gb,
IVIBandDesc band,
IVITile tile,
AVCodecContext avctx 
)
static

Definition at line 394 of file ivi_common.c.

Referenced by decode_band().

static av_cold void ivi_free_buffers ( IVIPlaneDesc planes)
static

Definition at line 201 of file ivi_common.c.

Referenced by ff_ivi_decode_close(), and ff_ivi_init_planes().

static int ivi_huff_desc_cmp ( const IVIHuffDesc desc1,
const IVIHuffDesc desc2 
)
static

Definition at line 141 of file ivi_common.c.

Referenced by ff_ivi_dec_huff_desc().

static void ivi_huff_desc_copy ( IVIHuffDesc dst,
const IVIHuffDesc src 
)
static

Definition at line 128 of file ivi_common.c.

Referenced by ff_ivi_dec_huff_desc().

static void ivi_output_plane ( IVIPlaneDesc plane,
uint8_t dst,
int  dst_pitch 
)
static

Definition at line 712 of file ivi_common.c.

Referenced by ff_ivi_decode_frame().

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]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 567 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 978 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 1015 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 1004 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 967 of file ivi_common.c.

const RVMapDesc ff_ivi_rvmap_tabs[9]

Run-value (RLE) tables.

Definition at line 1023 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 993 of file ivi_common.c.

Referenced by decode_gop_header().

VLC ivi_blk_vlc_tabs[8]
static

static block Huffman tables

Definition at line 42 of file ivi_common.c.

VLC ivi_mb_vlc_tabs[8]
static

static macroblock Huffman tables

Definition at line 41 of file ivi_common.c.