takdec.c File Reference

TAK (Tom's lossless Audio Kompressor) decoder. More...

#include "libavutil/internal.h"
#include "libavutil/samplefmt.h"
#include "tak.h"
#include "thread.h"
#include "avcodec.h"
#include "dsputil.h"
#include "internal.h"
#include "unary.h"

Go to the source code of this file.

Data Structures
struct	MCDParam
struct	TAKDecContext
struct	CParam

Macros
#define	MAX_SUBFRAMES   8
	max number of subframes per channel
#define	MAX_PREDICTORS   256

Functions
static int	set_bps_params (AVCodecContext *avctx)
static void	set_sample_rate_params (AVCodecContext *avctx)
static av_cold int	tak_decode_init (AVCodecContext *avctx)
static void	decode_lpc (int32_t *coeffs, int mode, int length)
static int	decode_segment (TAKDecContext *s, int8_t mode, int32_t *decoded, int len)
static int	decode_residues (TAKDecContext *s, int32_t *decoded, int length)
static int	get_bits_esc4 (GetBitContext *gb)
static int	decode_subframe (TAKDecContext *s, int32_t *decoded, int subframe_size, int prev_subframe_size)
static int	decode_channel (TAKDecContext *s, int chan)
static int	decorrelate (TAKDecContext *s, int c1, int c2, int length)
static int	tak_decode_frame (AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *pkt)
static int	init_thread_copy (AVCodecContext *avctx)
static int	update_thread_context (AVCodecContext *dst, const AVCodecContext *src)
static av_cold int	tak_decode_close (AVCodecContext *avctx)

Variables
static const int8_t	mc_dmodes [] = { 1, 3, 4, 6, }
static const uint16_t	predictor_sizes []
static struct CParam	xcodes [50]
AVCodec	ff_tak_decoder

Detailed Description

TAK (Tom's lossless Audio Kompressor) decoder.

Author

Paul B Mahol

Definition in file takdec.c.

Macro Definition Documentation

#define MAX_SUBFRAMES   8

max number of subframes per channel

Definition at line 37 of file takdec.c.

#define MAX_PREDICTORS   256

Definition at line 38 of file takdec.c.

Referenced by decode_subframe().

Function Documentation

static int set_bps_params ( AVCodecContext *  avctx )

static

Definition at line 140 of file takdec.c.

Referenced by tak_decode_frame(), and tak_decode_init().

static void set_sample_rate_params ( AVCodecContext *  avctx )

static

Definition at line 161 of file takdec.c.

Referenced by tak_decode_frame(), and tak_decode_init().

static av_cold int tak_decode_init ( AVCodecContext *  avctx )

static

Definition at line 170 of file takdec.c.

static void decode_lpc ( int32_t *  coeffs, int  mode, int  length  )

static

Definition at line 185 of file takdec.c.

Referenced by decode_subframe(), and tak_decode_frame().

static int decode_segment ( TAKDecContext *  s, int8_t  mode, int32_t *  decoded, int  len  )

static

Definition at line 240 of file takdec.c.

Referenced by decode_residues().

static int decode_residues ( TAKDecContext *  s, int32_t *  decoded, int  length  )

static

Definition at line 284 of file takdec.c.

Referenced by decode_subframe().

static int get_bits_esc4 ( GetBitContext *  gb )

static

Definition at line 363 of file takdec.c.

Referenced by decode_channel(), decode_subframe(), and decorrelate().

static int decode_subframe ( TAKDecContext *  s, int32_t *  decoded, int  subframe_size, int  prev_subframe_size  )

static

Definition at line 371 of file takdec.c.

Referenced by decode_channel().

static int decode_channel ( TAKDecContext *  s, int  chan  )

static

Definition at line 496 of file takdec.c.

Referenced by tak_decode_frame().

static int decorrelate ( TAKDecContext *  s, int  c1, int  c2, int  length  )

static

Definition at line 543 of file takdec.c.

Referenced by tak_decode_frame().

static int tak_decode_frame ( AVCodecContext *  avctx, void *  data, int *  got_frame_ptr, AVPacket *  pkt  )

static

Definition at line 672 of file takdec.c.

static int init_thread_copy ( AVCodecContext *  avctx )

static

Definition at line 905 of file takdec.c.

static int update_thread_context ( AVCodecContext *  dst, const AVCodecContext *  src  )

static

Definition at line 912 of file takdec.c.

static av_cold int tak_decode_close ( AVCodecContext *  avctx )

static

Definition at line 924 of file takdec.c.

Variable Documentation

const int8_t mc_dmodes[] = { 1, 3, 4, 6, }

static

Definition at line 75 of file takdec.c.

Referenced by tak_decode_frame().

const uint16_t predictor_sizes[]

static

Initial value:

= {
    4, 8, 12, 16, 24, 32, 48, 64, 80, 96, 128, 160, 192, 224, 256, 0,
}

Definition at line 77 of file takdec.c.

Referenced by decode_subframe().

struct CParam xcodes[50]

static

Referenced by decode_segment().

AVCodec ff_tak_decoder

Initial value:

= {
    .name             = "tak",
    .type             = AVMEDIA_TYPE_AUDIO,
    .id               = AV_CODEC_ID_TAK,
    .priv_data_size   = sizeof(TAKDecContext),
    .init             = tak_decode_init,
    .close            = tak_decode_close,
    .decode           = tak_decode_frame,
    .init_thread_copy = ONLY_IF_THREADS_ENABLED(init_thread_copy),
    .update_thread_context = ONLY_IF_THREADS_ENABLED(update_thread_context),
    .capabilities     = CODEC_CAP_DR1 | CODEC_CAP_FRAME_THREADS,
    .long_name        = NULL_IF_CONFIG_SMALL("TAK (Tom's lossless Audio Kompressor)"),
    .sample_fmts      = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_U8P,
                                                        AV_SAMPLE_FMT_S16P,
                                                        AV_SAMPLE_FMT_S32P,
                                                        AV_SAMPLE_FMT_NONE },
}

Definition at line 933 of file takdec.c.