ffwavesynth.c File Reference

#include "libavutil/intreadwrite.h"
#include "libavutil/log.h"
#include "avcodec.h"
#include "internal.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'), 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, int64_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, void *rframe, int *rgot_frame, AVPacket *packet)
static av_cold int	wavesynth_close (AVCodecContext *avc)

Variables
AVCodec	ff_ffwavesynth_decoder

Macro Definition Documentation

#define SIN_BITS   14

Definition at line 28 of file ffwavesynth.c.

Referenced by wavesynth_init(), and wavesynth_synth_sample().

#define WS_MAX_CHANNELS   32

Definition at line 29 of file ffwavesynth.c.

Referenced by wavesynth_decode(), and wavesynth_init().

#define INF_TS   0x7FFFFFFFFFFFFFFF

Definition at line 30 of file ffwavesynth.c.

Referenced by wavesynth_enter_intervals(), and wavesynth_seek().

#define PINK_UNIT   128

Definition at line 32 of file ffwavesynth.c.

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

#define LCG_A   1284865837

Definition at line 106 of file ffwavesynth.c.

Referenced by lcg_next(), and lcg_seek().

#define LCG_C   4150755663

Definition at line 107 of file ffwavesynth.c.

Referenced by lcg_next(), and lcg_seek().

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

Definition at line 108 of file ffwavesynth.c.

Referenced by lcg_seek().

Enumeration Type Documentation

enum ws_interval_type

Enumerator
WS_SINE
WS_NOISE
WS_SINE
WS_NOISE

Definition at line 77 of file ffwavesynth.c.

Function Documentation

static uint32_t lcg_next ( uint32_t *  s )

static

Definition at line 110 of file ffwavesynth.c.

Referenced by pink_fill(), and wavesynth_synth_sample().

static void lcg_seek ( uint32_t *  s, int64_t  dt  )

static

Definition at line 116 of file ffwavesynth.c.

Referenced by wavesynth_seek().

static void pink_fill ( struct wavesynth_context *  ws )

static

Definition at line 143 of file ffwavesynth.c.

Referenced by wavesynth_seek(), and wavesynth_synth_sample().

static uint64_t frac64 ( uint64_t  a, uint64_t  b  )

static

Returns

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

Definition at line 167 of file ffwavesynth.c.

Referenced by wavesynth_parse_extradata().

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

static

Definition at line 195 of file ffwavesynth.c.

Referenced by wavesynth_parse_extradata(), and wavesynth_seek().

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

static

Definition at line 203 of file ffwavesynth.c.

Referenced by wavesynth_decode(), and wavesynth_init().

static int wavesynth_parse_extradata ( AVCodecContext *  avc )

static

Definition at line 240 of file ffwavesynth.c.

Referenced by wavesynth_init().

static av_cold int wavesynth_init ( AVCodecContext *  avc )

static

Definition at line 315 of file ffwavesynth.c.

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

static

Definition at line 353 of file ffwavesynth.c.

Referenced by wavesynth_decode().

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

static

Definition at line 399 of file ffwavesynth.c.

Referenced by wavesynth_decode().

static int wavesynth_decode ( AVCodecContext *  avc, void *  rframe, int *  rgot_frame, AVPacket *  packet  )

static

Definition at line 424 of file ffwavesynth.c.

static av_cold int wavesynth_close ( AVCodecContext *  avc )

static

Definition at line 462 of file ffwavesynth.c.

Variable Documentation

AVCodec ff_ffwavesynth_decoder

Initial value:

= {
    .name           = "wavesynth",
    .long_name      = NULL_IF_CONFIG_SMALL("Wave synthesis pseudo-codec"),
    .type           = AVMEDIA_TYPE_AUDIO,
    .id             = AV_CODEC_ID_FFWAVESYNTH,
    .priv_data_size = sizeof(struct wavesynth_context),
    .init           = wavesynth_init,
    .close          = wavesynth_close,
    .decode         = wavesynth_decode,
    .capabilities   = AV_CODEC_CAP_DR1,
}

Definition at line 471 of file ffwavesynth.c.