libavfilter/asrc_aevalsrc.c File Reference

eval audio source More...

#include "libavutil/audioconvert.h"
#include "libavutil/avassert.h"
#include "libavutil/avstring.h"
#include "libavutil/eval.h"
#include "libavutil/opt.h"
#include "libavutil/parseutils.h"
#include "avfilter.h"
#include "internal.h"

Go to the source code of this file.

Data Structures
struct	EvalContext
Defines
#define	OFFSET(x)   offsetof(EvalContext, x)
Enumerations
enum	var_name {   VAR_B1, VAR_B2, VAR_S1, VAR_S2,   VAR_T1, VAR_T2, VAR_NB, VAR_N,   VAR_T, VAR_S, VAR_VARS_NB, VAR_W,   VAR_H, VAR_CW, VAR_CH, VAR_HSUB,   VAR_VSUB, VARS_NB, VAR_IN_W, VAR_IW,   VAR_IN_H, VAR_IH, VAR_OUT_W, VAR_OW,   VAR_OUT_H, VAR_OH, VAR_A, VAR_SAR,   VAR_DAR, VAR_HSUB, VAR_VSUB, VAR_X,   VAR_Y, VAR_N, VAR_POS, VAR_T,   VAR_VARS_NB, VAR_MAIN_W, VAR_w, VAR_W,   VAR_MAIN_H, VAR_h, VAR_H, VAR_TW,   VAR_TEXT_W, VAR_TH, VAR_TEXT_H, VAR_MAX_GLYPH_W,   VAR_MAX_GLYPH_H, VAR_MAX_GLYPH_A, VAR_ASCENT, VAR_MAX_GLYPH_D,   VAR_DESCENT, VAR_LINE_H, VAR_LH, VAR_SAR,   VAR_DAR, VAR_HSUB, VAR_VSUB, VAR_X,   VAR_Y, VAR_N, VAR_T, VAR_VARS_NB,   VAR_W, VAR_H, VAR_VAL, VAR_MAXVAL,   VAR_MINVAL, VAR_NEGVAL, VAR_CLIPVAL, VAR_VARS_NB,   VAR_MAIN_W, VAR_MW, VAR_MAIN_H, VAR_MH,   VAR_OVERLAY_W, VAR_OW, VAR_OVERLAY_H, VAR_OH,   VAR_VARS_NB, VAR_IN_W, VAR_IW, VAR_IN_H,   VAR_IH, VAR_OUT_W, VAR_OW, VAR_OUT_H,   VAR_OH, VAR_X, VAR_Y, VAR_A,   VAR_SAR, VAR_DAR, VAR_HSUB, VAR_VSUB,   VARS_NB, VAR_IN_W, VAR_IW, VAR_IN_H,   VAR_IH, VAR_OUT_W, VAR_OW, VAR_OUT_H,   VAR_OH, VAR_A, VAR_SAR, VAR_DAR,   VAR_HSUB, VAR_VSUB, VARS_NB, VAR_TB,   VAR_PTS, VAR_START_PTS, VAR_PREV_PTS, VAR_PREV_SELECTED_PTS,   VAR_T, VAR_START_T, VAR_PREV_T, VAR_PREV_SELECTED_T,   VAR_PICT_TYPE, VAR_PICT_TYPE_I, VAR_PICT_TYPE_P, VAR_PICT_TYPE_B,   VAR_PICT_TYPE_S, VAR_PICT_TYPE_SI, VAR_PICT_TYPE_SP, VAR_PICT_TYPE_BI,   VAR_INTERLACE_TYPE, VAR_INTERLACE_TYPE_P, VAR_INTERLACE_TYPE_T, VAR_INTERLACE_TYPE_B,   VAR_N, VAR_SELECTED_N, VAR_PREV_SELECTED_N, VAR_KEY,   VAR_POS, VAR_VARS_NB, VAR_INTERLACED, VAR_N,   VAR_POS, VAR_PREV_INPTS, VAR_PREV_OUTPTS, VAR_PTS,   VAR_STARTPTS, VAR_TB, VAR_VARS_NB, VAR_AVTB,   VAR_INTB, VAR_VARS_NB, VAR_X, VAR_Y,   VAR_W, VAR_H, VAR_TIME, VAR_SPEED,   VAR_TEMPO, VAR_ORDER, VAR_PATTERN, VAR_ROW,   VAR_VARS_NB }
Functions
static const char *	eval_get_name (void *ctx)
static int	init (AVFilterContext *ctx, const char *args, void *opaque)
static void	uninit (AVFilterContext *ctx)
static int	config_props (AVFilterLink *outlink)
static int	query_formats (AVFilterContext *ctx)
static int	request_frame (AVFilterLink *outlink)
Variables
static const char *const	var_names []
static const AVOption	eval_options []
static const AVClass	eval_class
AVFilter	avfilter_asrc_aevalsrc

---

Detailed Description

eval audio source

Definition in file asrc_aevalsrc.c.

---

Define Documentation

#define OFFSET

(

x

)

offsetof(EvalContext, x)

Definition at line 65 of file asrc_aevalsrc.c.

---

Enumeration Type Documentation

enum var_name

Enumerator:

VAR_B1
VAR_B2
VAR_S1
VAR_S2
VAR_T1
VAR_T2
VAR_NB
VAR_N
VAR_T
VAR_S
VAR_VARS_NB
VAR_W
VAR_H
VAR_CW
VAR_CH
VAR_HSUB
VAR_VSUB
VARS_NB
VAR_IN_W
VAR_IW
VAR_IN_H
VAR_IH
VAR_OUT_W
VAR_OW
VAR_OUT_H
VAR_OH
VAR_A
VAR_SAR
VAR_DAR
VAR_HSUB
VAR_VSUB
VAR_X
VAR_Y
VAR_N
VAR_POS
VAR_T
VAR_VARS_NB
VAR_MAIN_W
VAR_w
VAR_W
VAR_MAIN_H
VAR_h
VAR_H
VAR_TW
VAR_TEXT_W
VAR_TH
VAR_TEXT_H
VAR_MAX_GLYPH_W
VAR_MAX_GLYPH_H
VAR_MAX_GLYPH_A
VAR_ASCENT
VAR_MAX_GLYPH_D
VAR_DESCENT
VAR_LINE_H
VAR_LH
VAR_SAR
VAR_DAR
VAR_HSUB
VAR_VSUB
VAR_X
VAR_Y
VAR_N
VAR_T
VAR_VARS_NB
VAR_W
VAR_H
VAR_VAL
VAR_MAXVAL
VAR_MINVAL
VAR_NEGVAL
VAR_CLIPVAL
VAR_VARS_NB
VAR_MAIN_W
VAR_MW
VAR_MAIN_H
VAR_MH
VAR_OVERLAY_W
VAR_OW
VAR_OVERLAY_H
VAR_OH
VAR_VARS_NB
VAR_IN_W
VAR_IW
VAR_IN_H
VAR_IH
VAR_OUT_W
VAR_OW
VAR_OUT_H
VAR_OH
VAR_X
VAR_Y
VAR_A
VAR_SAR
VAR_DAR
VAR_HSUB
VAR_VSUB
VARS_NB
VAR_IN_W
VAR_IW
VAR_IN_H
VAR_IH
VAR_OUT_W
VAR_OW
VAR_OUT_H
VAR_OH
VAR_A
VAR_SAR
VAR_DAR
VAR_HSUB
VAR_VSUB
VARS_NB
VAR_TB
VAR_PTS
VAR_START_PTS
VAR_PREV_PTS
VAR_PREV_SELECTED_PTS
VAR_T
VAR_START_T
VAR_PREV_T
VAR_PREV_SELECTED_T
VAR_PICT_TYPE
VAR_PICT_TYPE_I
VAR_PICT_TYPE_P
VAR_PICT_TYPE_B
VAR_PICT_TYPE_S
VAR_PICT_TYPE_SI
VAR_PICT_TYPE_SP
VAR_PICT_TYPE_BI
VAR_INTERLACE_TYPE
VAR_INTERLACE_TYPE_P
VAR_INTERLACE_TYPE_T
VAR_INTERLACE_TYPE_B
VAR_N
VAR_SELECTED_N
VAR_PREV_SELECTED_N
VAR_KEY
VAR_POS
VAR_VARS_NB
VAR_INTERLACED
VAR_N
VAR_POS
VAR_PREV_INPTS
VAR_PREV_OUTPTS
VAR_PTS
VAR_STARTPTS
VAR_TB
VAR_VARS_NB
VAR_AVTB
VAR_INTB
VAR_VARS_NB
VAR_X
VAR_Y
VAR_W
VAR_H
VAR_TIME
VAR_SPEED
VAR_TEMPO
VAR_ORDER
VAR_PATTERN
VAR_ROW
VAR_VARS_NB

Definition at line 42 of file asrc_aevalsrc.c.

---

Function Documentation

static int config_props

(

AVFilterLink *

outlink

)

[static]

Definition at line 171 of file asrc_aevalsrc.c.

static const char* eval_get_name

(

void *

ctx

)

[static]

Definition at line 77 of file asrc_aevalsrc.c.

static int init	(	AVFilterContext *	ctx,
		const char *	args,
		void *	opaque
	)			[static]

Definition at line 88 of file asrc_aevalsrc.c.

static int query_formats

(

AVFilterContext *

ctx

)

[static]

Definition at line 190 of file asrc_aevalsrc.c.

static int request_frame

(

AVFilterLink *

outlink

)

[static]

Definition at line 204 of file asrc_aevalsrc.c.

static void uninit

(

AVFilterContext *

ctx

)

[static]

Definition at line 158 of file asrc_aevalsrc.c.

---

Variable Documentation

AVFilter avfilter_asrc_aevalsrc

Initial value:

 {
    .name        = "aevalsrc",
    .description = NULL_IF_CONFIG_SMALL("Generate an audio signal generated by an expression."),

    .query_formats = query_formats,
    .init        = init,
    .uninit      = uninit,
    .priv_size   = sizeof(EvalContext),

    .inputs      = (const AVFilterPad[]) {{ .name = NULL}},

    .outputs     = (const AVFilterPad[]) {{ .name = "default",
                                      .type = AVMEDIA_TYPE_AUDIO,
                                      .config_props = config_props,
                                      .request_frame = request_frame, },
                                    { .name = NULL}},
}

Definition at line 237 of file asrc_aevalsrc.c.

const AVClass eval_class [static]

Initial value:

 {
    "AEvalSrcContext",
    eval_get_name,
    eval_options
}

Definition at line 82 of file asrc_aevalsrc.c.

const AVOption eval_options[] [static]

Initial value:

 {
    { "nb_samples",  "set the number of samples per requested frame", OFFSET(nb_samples),      AV_OPT_TYPE_INT,    {.dbl = 1024},    0,        INT_MAX },
    { "n",           "set the number of samples per requested frame", OFFSET(nb_samples),      AV_OPT_TYPE_INT,    {.dbl = 1024},    0,        INT_MAX },
    { "sample_rate", "set the sample rate",                           OFFSET(sample_rate_str), AV_OPT_TYPE_STRING, {.str = "44100"}, CHAR_MIN, CHAR_MAX },
    { "s",           "set the sample rate",                           OFFSET(sample_rate_str), AV_OPT_TYPE_STRING, {.str = "44100"}, CHAR_MIN, CHAR_MAX },
    { "duration",    "set audio duration", OFFSET(duration_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0 },
    { "d",           "set audio duration", OFFSET(duration_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0 },
{NULL},
}

Definition at line 67 of file asrc_aevalsrc.c.

const char* const var_names[] [static]

Initial value:

 {
    "n",            
    "t",            
    "s",            
    NULL
}

Definition at line 35 of file asrc_aevalsrc.c.