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 "audio.h"
#include "internal.h"

Go to the source code of this file.

Data Structures
struct	EvalContext
Defines
#define	OFFSET(x)   offsetof(EvalContext, x)
#define	FLAGS   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
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_FRAME_RATE,   VAR_INTERLACED, VAR_N, VAR_NB_CONSUMED_SAMPLES, VAR_NB_SAMPLES,   VAR_POS, VAR_PREV_INPTS, VAR_PREV_INT, VAR_PREV_OUTPTS,   VAR_PREV_OUTT, VAR_PTS, VAR_SAMPLE_RATE, VAR_STARTPTS,   VAR_STARTT, VAR_T, VAR_TB, VAR_VARS_NB,   VAR_AVTB, VAR_INTB, VAR_SR, 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_DAR, VAR_HSUB,   VAR_VSUB, VAR_LINE_H, VAR_LH, VAR_MAIN_H,   VAR_h, VAR_H, VAR_MAIN_W, VAR_w,   VAR_W, VAR_MAX_GLYPH_A, VAR_ASCENT, VAR_MAX_GLYPH_D,   VAR_DESCENT, VAR_MAX_GLYPH_H, VAR_MAX_GLYPH_W, VAR_N,   VAR_SAR, VAR_T, VAR_TEXT_H, VAR_TH,   VAR_TEXT_W, VAR_TW, VAR_X, VAR_Y,   VAR_VARS_NB, VAR_N, VAR_PTS, VAR_R,   VAR_T, VAR_TB, VAR_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_SCENE, 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
	AVFILTER_DEFINE_CLASS (aevalsrc)
static int	init (AVFilterContext *ctx, const char *args)
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	aevalsrc_options []
AVFilter	avfilter_asrc_aevalsrc

---

Detailed Description

eval audio source

Definition in file asrc_aevalsrc.c.

---

Define Documentation

#define FLAGS   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Definition at line 68 of file asrc_aevalsrc.c.

#define OFFSET

(

x

)

offsetof(EvalContext, x)

Definition at line 67 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_FRAME_RATE
VAR_INTERLACED
VAR_N
VAR_NB_CONSUMED_SAMPLES
VAR_NB_SAMPLES
VAR_POS
VAR_PREV_INPTS
VAR_PREV_INT
VAR_PREV_OUTPTS
VAR_PREV_OUTT
VAR_PTS
VAR_SAMPLE_RATE
VAR_STARTPTS
VAR_STARTT
VAR_T
VAR_TB
VAR_VARS_NB
VAR_AVTB
VAR_INTB
VAR_SR
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_DAR
VAR_HSUB
VAR_VSUB
VAR_LINE_H
VAR_LH
VAR_MAIN_H
VAR_h
VAR_H
VAR_MAIN_W
VAR_w
VAR_W
VAR_MAX_GLYPH_A
VAR_ASCENT
VAR_MAX_GLYPH_D
VAR_DESCENT
VAR_MAX_GLYPH_H
VAR_MAX_GLYPH_W
VAR_N
VAR_SAR
VAR_T
VAR_TEXT_H
VAR_TH
VAR_TEXT_W
VAR_TW
VAR_X
VAR_Y
VAR_VARS_NB
VAR_N
VAR_PTS
VAR_R
VAR_T
VAR_TB
VAR_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_SCENE
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 43 of file asrc_aevalsrc.c.

---

Function Documentation

AVFILTER_DEFINE_CLASS

(

aevalsrc

)

static int config_props

(

AVFilterLink *

outlink

)

[static]

Definition at line 173 of file asrc_aevalsrc.c.

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

Definition at line 84 of file asrc_aevalsrc.c.

static int query_formats

(

AVFilterContext *

ctx

)

[static]

Definition at line 192 of file asrc_aevalsrc.c.

static int request_frame

(

AVFilterLink *

outlink

)

[static]

Definition at line 206 of file asrc_aevalsrc.c.

static void uninit

(

AVFilterContext *

ctx

)

[static]

Definition at line 159 of file asrc_aevalsrc.c.

---

Variable Documentation

const AVOption aevalsrc_options[] [static]

Initial value:

 {
    { "nb_samples",  "set the number of samples per requested frame", OFFSET(nb_samples),      AV_OPT_TYPE_INT,    {.i64 = 1024},    0,        INT_MAX, FLAGS },
    { "n",           "set the number of samples per requested frame", OFFSET(nb_samples),      AV_OPT_TYPE_INT,    {.i64 = 1024},    0,        INT_MAX, FLAGS },
    { "sample_rate", "set the sample rate",                           OFFSET(sample_rate_str), AV_OPT_TYPE_STRING, {.str = "44100"}, CHAR_MIN, CHAR_MAX, FLAGS },
    { "s",           "set the sample rate",                           OFFSET(sample_rate_str), AV_OPT_TYPE_STRING, {.str = "44100"}, CHAR_MIN, CHAR_MAX, FLAGS },
    { "duration",    "set audio duration", OFFSET(duration_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS },
    { "d",           "set audio duration", OFFSET(duration_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS },
    { "channel_layout", "set channel layout", OFFSET(chlayout_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS },
    { "c",              "set channel layout", OFFSET(chlayout_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS },
{NULL},
}

Definition at line 70 of file asrc_aevalsrc.c.

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}},
    .priv_class = &aevalsrc_class,
}

Definition at line 239 of file asrc_aevalsrc.c.

const char* const var_names[] [static]

Initial value:

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

Definition at line 36 of file asrc_aevalsrc.c.