dec.c File Reference

Opus decoder. More...

#include <stdint.h>
#include "libavutil/attributes.h"
#include "libavutil/audio_fifo.h"
#include "libavutil/channel_layout.h"
#include "libavutil/ffmath.h"
#include "libavutil/float_dsp.h"
#include "libavutil/frame.h"
#include "libavutil/mem.h"
#include "libavutil/mem_internal.h"
#include "libavutil/opt.h"
#include "libswresample/swresample.h"
#include "libavcodec/avcodec.h"
#include "libavcodec/codec_internal.h"
#include "libavcodec/decode.h"
#include "opus.h"
#include "tab.h"
#include "celt.h"
#include "parse.h"
#include "rc.h"
#include "silk.h"

Go to the source code of this file.

Data Structures
struct	OpusStreamContext
struct	OpusContext

Macros
#define	OFFSET(x)
#define	AD   AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_DECODING_PARAM

Functions
static int	get_silk_samplerate (int config)
static void	opus_fade (float *out, const float *in1, const float *in2, const float *window, int len)
static int	opus_flush_resample (OpusStreamContext *s, int nb_samples)
static int	opus_init_resample (OpusStreamContext *s)
static int	opus_decode_redundancy (OpusStreamContext *s, const uint8_t *data, int size)
static int	opus_decode_frame (OpusStreamContext *s, const uint8_t *data, int size)
static int	opus_decode_subpacket (OpusStreamContext *s, const uint8_t *buf)
static int	opus_decode_packet (AVCodecContext *avctx, AVFrame *frame, int *got_frame_ptr, AVPacket *avpkt)
static av_cold void	opus_decode_flush (AVCodecContext *ctx)
static av_cold int	opus_decode_close (AVCodecContext *avctx)
static av_cold int	opus_decode_init (AVCodecContext *avctx)

Variables
static const uint16_t	silk_frame_duration_ms [16]
static const int	silk_resample_delay []
static const AVOption	opus_options []
static const AVClass	opus_class
const FFCodec	ff_opus_decoder

Detailed Description

Opus decoder.

Author

Andrew D'Addesio, Anton Khirnov

Codec homepage: http://opus-codec.org/ Specification: http://tools.ietf.org/html/rfc6716 Ogg Opus specification: https://tools.ietf.org/html/draft-ietf-codec-oggopus-03

Ogg-contained .opus files can be produced with opus-tools: http://git.xiph.org/?p=opus-tools.git

Definition in file dec.c.

Macro Definition Documentation

OFFSET

#define OFFSET

(

x

)

Value:

offsetof(OpusContext, x)

Definition at line 759 of file dec.c.

AD

#define AD   AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_DECODING_PARAM

Definition at line 760 of file dec.c.

Function Documentation

get_silk_samplerate()

static int get_silk_samplerate ( int config )

static

Definition at line 132 of file dec.c.

Referenced by opus_decode_packet().

opus_fade()

static void opus_fade ( float * out, const float * in1, const float * in2, const float * window, int len )

static

Definition at line 141 of file dec.c.

Referenced by opus_decode_frame(), and opus_flush_resample().

opus_flush_resample()

static int opus_flush_resample ( OpusStreamContext * s, int nb_samples )

static

Definition at line 150 of file dec.c.

Referenced by opus_decode_subpacket().

opus_init_resample()

static int opus_init_resample ( OpusStreamContext * s )

static

Definition at line 193 of file dec.c.

Referenced by opus_decode_frame().

opus_decode_redundancy()

static int opus_decode_redundancy ( OpusStreamContext * s, const uint8_t * data, int size )

static

Definition at line 218 of file dec.c.

Referenced by opus_decode_frame().

opus_decode_frame()

static int opus_decode_frame ( OpusStreamContext * s, const uint8_t * data, int size )

static

Definition at line 238 of file dec.c.

Referenced by opus_decode_subpacket().

opus_decode_subpacket()

static int opus_decode_subpacket ( OpusStreamContext * s, const uint8_t * buf )

static

Definition at line 397 of file dec.c.

Referenced by opus_decode_packet().

opus_decode_packet()

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

static

Definition at line 477 of file dec.c.

opus_decode_flush()

static av_cold void opus_decode_flush ( AVCodecContext * ctx )

static

Definition at line 634 of file dec.c.

opus_decode_close()

static av_cold int opus_decode_close ( AVCodecContext * avctx )

static

Definition at line 654 of file dec.c.

opus_decode_init()

static av_cold int opus_decode_init ( AVCodecContext * avctx )

static

Definition at line 682 of file dec.c.

Variable Documentation

silk_frame_duration_ms

const uint16_t silk_frame_duration_ms[16]

static

Initial value:

= {
    10, 20, 40, 60,
    10, 20, 40, 60,
    10, 20, 40, 60,
    10, 20,
    10, 20,
}

Definition at line 61 of file dec.c.

Referenced by opus_decode_frame().

silk_resample_delay

const int silk_resample_delay[]

static

Initial value:

= {
    4, 8, 11, 11, 11
}

Definition at line 71 of file dec.c.

Referenced by opus_init_resample().

opus_options

const AVOption opus_options[]

static

Initial value:

= {
    { "apply_phase_inv", "Apply intensity stereo phase inversion", OFFSET(apply_phase_inv), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, AD },
    { NULL },
}

Definition at line 761 of file dec.c.

opus_class

const AVClass opus_class

static

Initial value:

= {
    .class_name = "Opus Decoder",
    .item_name  = av_default_item_name,
    .option     = opus_options,
    .version    = LIBAVUTIL_VERSION_INT,
}

Definition at line 766 of file dec.c.

ff_opus_decoder

const FFCodec ff_opus_decoder

Initial value:

= {
    .p.name          = "opus",
    CODEC_LONG_NAME("Opus"),
    .p.priv_class    = &opus_class,
    .p.type          = AVMEDIA_TYPE_AUDIO,
    .p.id            = AV_CODEC_ID_OPUS,
    .priv_data_size  = sizeof(OpusContext),
    .init            = opus_decode_init,
    .close           = opus_decode_close,
    FF_CODEC_DECODE_CB(opus_decode_packet),
    .flush           = opus_decode_flush,
    .p.capabilities  = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY | AV_CODEC_CAP_CHANNEL_CONF,
    .caps_internal   = FF_CODEC_CAP_INIT_CLEANUP,
}

Definition at line 773 of file dec.c.