ffwavesynth.c File Reference

#include "libavutil/intreadwrite.h"
#include "libavutil/log.h"
#include "libavutil/mem.h"
#include "avcodec.h"
#include "codec_internal.h"
#include "decode.h"

Go to the source code of this file.

Data Structures
struct	ws_interval
struct	wavesynth_context

Macros
#define	SIN_BITS   14
#define	WS_MAX_CHANNELS   32
#define	INF_TS   0x7FFFFFFFFFFFFFFF
#define	PINK_UNIT   128
#define	LCG_A   1284865837
#define	LCG_C   4150755663
#define	LCG_AI   849225893 /* A*AI = 1 [mod 1<<32] */

Enumerations
enum	ws_interval_type { WS_SINE = MKTAG('S','I','N','E') , WS_NOISE = MKTAG('N','O','I','S') }

Functions
static uint32_t	lcg_next (uint32_t *s)
static void	lcg_seek (uint32_t *s, uint32_t dt)
static void	pink_fill (struct wavesynth_context *ws)
static uint64_t	frac64 (uint64_t a, uint64_t b)
static uint64_t	phi_at (struct ws_interval *in, int64_t ts)
static void	wavesynth_seek (struct wavesynth_context *ws, int64_t ts)
static int	wavesynth_parse_extradata (AVCodecContext *avc)
static av_cold int	wavesynth_init (AVCodecContext *avc)
static void	wavesynth_synth_sample (struct wavesynth_context *ws, int64_t ts, int32_t *channels)
static void	wavesynth_enter_intervals (struct wavesynth_context *ws, int64_t ts)
static int	wavesynth_decode (AVCodecContext *avc, AVFrame *frame, int *rgot_frame, AVPacket *packet)
static av_cold int	wavesynth_close (AVCodecContext *avc)

Variables
const FFCodec	ff_ffwavesynth_decoder

Macro Definition Documentation

SIN_BITS

#define SIN_BITS   14

Definition at line 30 of file ffwavesynth.c.

Referenced by wavesynth_init(), and wavesynth_synth_sample().

WS_MAX_CHANNELS

#define WS_MAX_CHANNELS   32

Definition at line 31 of file ffwavesynth.c.

Referenced by wavesynth_decode(), and wavesynth_init().

INF_TS

#define INF_TS   0x7FFFFFFFFFFFFFFF

Definition at line 32 of file ffwavesynth.c.

Referenced by wavesynth_enter_intervals(), and wavesynth_seek().

PINK_UNIT

#define PINK_UNIT   128

Definition at line 34 of file ffwavesynth.c.

Referenced by pink_fill(), wavesynth_init(), wavesynth_seek(), and wavesynth_synth_sample().

LCG_A

#define LCG_A   1284865837

Definition at line 108 of file ffwavesynth.c.

Referenced by lcg_next(), and lcg_seek().

LCG_C

#define LCG_C   4150755663

Definition at line 109 of file ffwavesynth.c.

Referenced by lcg_next(), and lcg_seek().

LCG_AI

#define LCG_AI   849225893 /* A*AI = 1 [mod 1<<32] */

Definition at line 110 of file ffwavesynth.c.

Enumeration Type Documentation

ws_interval_type

enum ws_interval_type

Enumerator
WS_SINE
WS_NOISE

Definition at line 79 of file ffwavesynth.c.

Function Documentation

lcg_next()

static uint32_t lcg_next ( uint32_t * s )

static

Definition at line 112 of file ffwavesynth.c.

Referenced by pink_fill(), and wavesynth_synth_sample().

lcg_seek()

static void lcg_seek ( uint32_t * s, uint32_t dt )

static

Definition at line 118 of file ffwavesynth.c.

Referenced by wavesynth_seek().

pink_fill()

static void pink_fill ( struct wavesynth_context * ws )

static

Definition at line 139 of file ffwavesynth.c.

Referenced by wavesynth_seek(), and wavesynth_synth_sample().

frac64()

static uint64_t frac64 ( uint64_t a, uint64_t b )

static

Returns

(1<<64) * a / b, without overflow, if a < b

Definition at line 163 of file ffwavesynth.c.

Referenced by wavesynth_parse_extradata().

phi_at()

static uint64_t phi_at ( struct ws_interval * in, int64_t ts )

static

Definition at line 191 of file ffwavesynth.c.

Referenced by wavesynth_parse_extradata(), and wavesynth_seek().

wavesynth_seek()

static void wavesynth_seek ( struct wavesynth_context * ws, int64_t ts )

static

Definition at line 199 of file ffwavesynth.c.

Referenced by wavesynth_decode(), and wavesynth_init().

wavesynth_parse_extradata()

static int wavesynth_parse_extradata ( AVCodecContext * avc )

static

Definition at line 236 of file ffwavesynth.c.

Referenced by wavesynth_init().

wavesynth_init()

static av_cold int wavesynth_init ( AVCodecContext * avc )

static

Definition at line 314 of file ffwavesynth.c.

wavesynth_synth_sample()

static void wavesynth_synth_sample ( struct wavesynth_context * ws, int64_t ts, int32_t * channels )

static

Definition at line 345 of file ffwavesynth.c.

Referenced by wavesynth_decode().

wavesynth_enter_intervals()

static void wavesynth_enter_intervals ( struct wavesynth_context * ws, int64_t ts )

static

Definition at line 392 of file ffwavesynth.c.

Referenced by wavesynth_decode().

wavesynth_decode()

static int wavesynth_decode ( AVCodecContext * avc, AVFrame * frame, int * rgot_frame, AVPacket * packet )

static

Definition at line 417 of file ffwavesynth.c.

wavesynth_close()

static av_cold int wavesynth_close ( AVCodecContext * avc )

static

Definition at line 454 of file ffwavesynth.c.

Variable Documentation

ff_ffwavesynth_decoder

const FFCodec ff_ffwavesynth_decoder

Initial value:

= {
    .p.name         = "wavesynth",
    CODEC_LONG_NAME("Wave synthesis pseudo-codec"),
    .p.type         = AVMEDIA_TYPE_AUDIO,
    .p.id           = AV_CODEC_ID_FFWAVESYNTH,
    .priv_data_size = sizeof(struct wavesynth_context),
    .init           = wavesynth_init,
    .close          = wavesynth_close,
    FF_CODEC_DECODE_CB(wavesynth_decode),
    .p.capabilities = AV_CODEC_CAP_DR1,
    .caps_internal  = FF_CODEC_CAP_INIT_CLEANUP,
}

Definition at line 463 of file ffwavesynth.c.