qoadec.c File Reference

#include "avcodec.h"
#include "codec_internal.h"
#include "decode.h"
#include "get_bits.h"
#include "bytestream.h"
#include "mathops.h"

Go to the source code of this file.

Data Structures
struct	QOAChannel
struct	QOAContext

Macros
#define	QOA_SLICE_LEN   20
#define	QOA_LMS_LEN   4

Functions
static av_cold int	qoa_decode_init (AVCodecContext *avctx)
static int	qoa_lms_predict (QOAChannel *lms)
static void	qoa_lms_update (QOAChannel *lms, int sample, int residual)
static int	qoa_decode_frame (AVCodecContext *avctx, AVFrame *frame, int *got_frame_ptr, AVPacket *avpkt)

Variables
static const int16_t	qoa_dequant_tab [16][8]
const FFCodec	ff_qoa_decoder

Macro Definition Documentation

QOA_SLICE_LEN

#define QOA_SLICE_LEN   20

Definition at line 28 of file qoadec.c.

QOA_LMS_LEN

#define QOA_LMS_LEN   4

Definition at line 29 of file qoadec.c.

Function Documentation

qoa_decode_init()

static av_cold int qoa_decode_init ( AVCodecContext *  avctx )

static

Definition at line 59 of file qoadec.c.

qoa_lms_predict()

static int qoa_lms_predict ( QOAChannel *  lms )

static

Definition at line 66 of file qoadec.c.

Referenced by qoa_decode_frame().

qoa_lms_update()

static void qoa_lms_update ( QOAChannel *  lms, int  sample, int  residual  )

static

Definition at line 74 of file qoadec.c.

Referenced by qoa_decode_frame().

qoa_decode_frame()

static int qoa_decode_frame ( AVCodecContext *  avctx, AVFrame *  frame, int *  got_frame_ptr, AVPacket *  avpkt  )

static

Definition at line 84 of file qoadec.c.

Variable Documentation

qoa_dequant_tab

const int16_t qoa_dequant_tab[16][8]

static

Initial value:

= {
    {   1,    -1,    3,    -3,    5,    -5,     7,     -7},
    {   5,    -5,   18,   -18,   32,   -32,    49,    -49},
    {  16,   -16,   53,   -53,   95,   -95,   147,   -147},
    {  34,   -34,  113,  -113,  203,  -203,   315,   -315},
    {  63,   -63,  210,  -210,  378,  -378,   588,   -588},
    { 104,  -104,  345,  -345,  621,  -621,   966,   -966},
    { 158,  -158,  528,  -528,  950,  -950,  1477,  -1477},
    { 228,  -228,  760,  -760, 1368, -1368,  2128,  -2128},
    { 316,  -316, 1053, -1053, 1895, -1895,  2947,  -2947},
    { 422,  -422, 1405, -1405, 2529, -2529,  3934,  -3934},
    { 548,  -548, 1828, -1828, 3290, -3290,  5117,  -5117},
    { 696,  -696, 2320, -2320, 4176, -4176,  6496,  -6496},
    { 868,  -868, 2893, -2893, 5207, -5207,  8099,  -8099},
    {1064, -1064, 3548, -3548, 6386, -6386,  9933,  -9933},
    {1286, -1286, 4288, -4288, 7718, -7718, 12005, -12005},
    {1536, -1536, 5120, -5120, 9216, -9216, 14336, -14336},
}

Definition at line 40 of file qoadec.c.

Referenced by qoa_decode_frame().

ff_qoa_decoder

const FFCodec ff_qoa_decoder

Initial value:

= {
    .p.name         = "qoa",
    CODEC_LONG_NAME("QOA (Quite OK Audio)"),
    .p.type         = AVMEDIA_TYPE_AUDIO,
    .p.id           = AV_CODEC_ID_QOA,
    .priv_data_size = sizeof(QOAContext),
    .init           = qoa_decode_init,
    FF_CODEC_DECODE_CB(qoa_decode_frame),
    .p.capabilities = AV_CODEC_CAP_CHANNEL_CONF |
                      AV_CODEC_CAP_DR1,
    .p.sample_fmts  = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16,
                                                      AV_SAMPLE_FMT_NONE },
}

Definition at line 158 of file qoadec.c.