QDM2 decoder. More...

#include <math.h>
#include <stddef.h>
#include <stdio.h>
#include "libavutil/channel_layout.h"
#include "avcodec.h"
#include "get_bits.h"
#include "bytestream.h"
#include "internal.h"
#include "mpegaudio.h"
#include "mpegaudiodsp.h"
#include "rdft.h"
#include "qdm2_tablegen.h"

Classes
struct	QDM2SubPacket
	Subpacket. More...

struct	QDM2SubPNode
	A node in the subpacket list. More...

struct	QDM2Complex

struct	FFTTone

struct	FFTCoefficient

struct	QDM2FFT

struct	QDM2Context
	QDM2 decoder context. More...

Macros
#define	BITSTREAM_READER_LE

#define	QDM2_LIST_ADD(list, size, packet)

#define	QDM2_SB_USED(sub_sampling) (((sub_sampling) >= 2) ? 30 : 8 << (sub_sampling))

#define	FIX_NOISE_IDX(noise_idx)

#define	SB_DITHERING_NOISE(sb, noise_idx) (noise_table[(noise_idx)++] * sb_noise_attenuation[(sb)])

#define	SAMPLES_NEEDED av_log (NULL,AV_LOG_INFO,"This file triggers some untested code. Please contact the developers.\n");

#define	SAMPLES_NEEDED_2(why) av_log (NULL,AV_LOG_INFO,"This file triggers some missing code. Please contact the developers.\nPosition: %s\n",why);

#define	QDM2_MAX_FRAME_SIZE 512

Typedefs
typedef int8_t	sb_int8_array[2][30][64]

typedef struct QDM2SubPacket	QDM2SubPacket
	Subpacket.

typedef struct QDM2SubPNode	QDM2SubPNode
	A node in the subpacket list.

typedef struct QDM2Complex	QDM2Complex

typedef struct FFTTone	FFTTone

typedef struct FFTCoefficient	FFTCoefficient

typedef struct QDM2FFT	QDM2FFT

typedef struct QDM2Context	QDM2Context
	QDM2 decoder context.

Variables
AVCodec	ff_qdm2_decoder

Detailed Description

QDM2 decoder.

Author: Ewald Snel, Benjamin Larsson, Alex Beregszaszi, Roberto Togni

The decoder is not perfect yet, there are still some distortions especially on files encoded with 16 or 8 subbands.

Macro Definition Documentation

§ FIX_NOISE_IDX

#define FIX_NOISE_IDX ( noise_idx )

Value:

if ((noise_idx) >= 3840) \

(noise_idx) -= 3840; \

§ QDM2_LIST_ADD

#define QDM2_LIST_ADD	(	list,
		size,
		packet
	)

Value:

do { \
      if (size > 0) { \
    list[size - 1].next = &list[size]; \
      } \
      list[size].packet = packet; \
      list[size].next = NULL; \
      size++; \
} while(0)

Variable Documentation

§ ff_qdm2_decoder

AVCodec ff_qdm2_decoder

Initial value:

= {
    .name             = "qdm2",
    .long_name        = NULL_IF_CONFIG_SMALL("QDesign Music Codec 2"),
    .type             = AVMEDIA_TYPE_AUDIO,
    .id               = AV_CODEC_ID_QDM2,
    .priv_data_size   = sizeof(QDM2Context),
    .init             = qdm2_decode_init,
    .close            = qdm2_decode_close,
    .decode           = qdm2_decode_frame,
    .capabilities     = AV_CODEC_CAP_DR1,
}

Classes

Macros