misc4.c File Reference

#include "libavutil/internal.h"
#include "libavutil/intreadwrite.h"
#include "avcodec.h"
#include "codec_internal.h"
#include "decode.h"
#include "bytestream.h"
#include "mathops.h"

Go to the source code of this file.

Data Structures
struct	ChannelContext
struct	MISC4Context

Macros
#define	FRACBITS   12
#define	WEIGHTSBITS   26

Functions
static av_cold int	misc4_init (AVCodecContext *avctx)
static int64_t	prediction (int delta, ChannelContext *c)
static int16_t	decode (ChannelContext *c, unsigned nibble)
static int	misc4_decode (AVCodecContext *avctx, AVFrame *frame, int *got_frame_ptr, AVPacket *pkt)

Variables
static const int16_t	steps [16]
static const int16_t	diffs [16]
const FFCodec	ff_misc4_decoder

Macro Definition Documentation

FRACBITS

#define FRACBITS   12

Definition at line 75 of file misc4.c.

WEIGHTSBITS

#define WEIGHTSBITS   26

Definition at line 76 of file misc4.c.

Function Documentation

misc4_init()

static av_cold int misc4_init ( AVCodecContext *  avctx )

static

Definition at line 56 of file misc4.c.

prediction()

static int64_t prediction ( int  delta, ChannelContext *  c  )

static

Definition at line 78 of file misc4.c.

Referenced by aptx_prediction_filtering(), aptx_process_subband(), aptx_reconstructed_differences_update(), decode(), encode_plane_slice(), encode_plane_slice_raw(), and ff_aptx_init().

decode()

static int16_t decode ( ChannelContext *  c, unsigned  nibble  )

static

Definition at line 107 of file misc4.c.

Referenced by misc4_decode().

misc4_decode()

static int misc4_decode ( AVCodecContext *  avctx, AVFrame *  frame, int *  got_frame_ptr, AVPacket *  pkt  )

static

Definition at line 131 of file misc4.c.

Variable Documentation

steps

const int16_t steps[16]

static

Initial value:

= {
    4084, 18, 41, 64, 112, 198, 355, 1122,
    1122, 355, 198, 112, 64, 41, 18, 4084,
}

Definition at line 30 of file misc4.c.

Referenced by av_get_padded_bits_per_pixel(), check_horiz_slice(), check_verti_slice(), decode(), do_elbg(), do_vertical_columns(), encode_frame(), filter_horizontally(), filter_vertically(), horiz_slice_c(), l2_unscale_group(), mp_decode_layer2(), mpegaudiodec_common_init_static(), set_params(), twiddle(), and verti_slice_c().

diffs

const int16_t diffs[16]

static

Initial value:

= {
    2048, 4, 135, 213, 273, 323, 373, 425,
    425, 373, 323, 273, 213, 135, 4, 2048,
}

Definition at line 35 of file misc4.c.

Referenced by decode().

ff_misc4_decoder

const FFCodec ff_misc4_decoder

Initial value:

= {
    .p.name           = "misc4",
    CODEC_LONG_NAME("Micronas SC-4 Audio"),
    .p.type           = AVMEDIA_TYPE_AUDIO,
    .p.id             = AV_CODEC_ID_MISC4,
    .priv_data_size   = sizeof(MISC4Context),
    .init             = misc4_init,
    FF_CODEC_DECODE_CB(misc4_decode),
    .p.capabilities   = AV_CODEC_CAP_DR1 |
 
                        AV_CODEC_CAP_SUBFRAMES |
 
                        AV_CODEC_CAP_CHANNEL_CONF,
    .p.sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16,
                                                        AV_SAMPLE_FMT_NONE },
}

Definition at line 174 of file misc4.c.