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/*
* This file is part of MPlayer.
*
* MPlayer is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* MPlayer is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with MPlayer; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef MPLAYER_AF_H
#define MPLAYER_AF_H
#include <stdio.h>
#include <stdbool.h>
#include "config.h"
#include "mpvcore/options.h"
#include "audio/format.h"
#include "audio/chmap.h"
#include "audio/audio.h"
#include "control.h"
#include "mpvcore/mp_msg.h"
struct af_instance;
// Number of channels
#define AF_NCH MP_NUM_CHANNELS
// Flags used for defining the behavior of an audio filter
#define AF_FLAGS_REENTRANT 0x00000000
#define AF_FLAGS_NOT_REENTRANT 0x00000001
/* Audio filter information not specific for current instance, but for
a specific filter */
struct af_info {
const char *info;
const char *name;
const int flags;
int (*open)(struct af_instance *vf);
bool (*test_conversion)(int src_format, int dst_format);
int priv_size;
const void *priv_defaults;
const struct m_option *options;
};
// Linked list of audio filters
struct af_instance {
const struct af_info *info;
int (*control)(struct af_instance *af, int cmd, void *arg);
void (*uninit)(struct af_instance *af);
struct mp_audio * (*play)(struct af_instance *af, struct mp_audio *data);
void *setup; // old field for priv structs
void *priv;
struct mp_audio *data; // configuration and buffer for outgoing data stream
struct af_instance *next;
struct af_instance *prev;
double delay; /* Delay caused by the filter, in seconds of audio consumed
* without corresponding output */
double mul; /* length multiplier: how much does this instance change
* the number of samples passed though. (Ratio of input
* and output, e.g. mul=4 => 1 sample becomes 4 samples) .*/
bool auto_inserted; // inserted by af.c, such as conversion filters
};
// Current audio stream
struct af_stream {
// The first and last filter in the list
struct af_instance *first;
struct af_instance *last;
// The user sets the input format (what the decoder outputs), and sets some
// or all fields in output to the output format the AO accepts.
// See fixup_output_format().
struct mp_audio input;
struct mp_audio output;
struct mp_audio filter_output;
struct MPOpts *opts;
};
// Return values
#define AF_DETACH 2
#define AF_OK 1
#define AF_TRUE 1
#define AF_FALSE 0
#define AF_UNKNOWN -1
#define AF_ERROR -2
#define AF_FATAL -3
struct af_stream *af_new(struct MPOpts *opts);
void af_destroy(struct af_stream *s);
int af_init(struct af_stream *s);
void af_uninit(struct af_stream *s);
struct af_instance *af_add(struct af_stream *s, char *name, char **args);
struct mp_audio *af_play(struct af_stream *s, struct mp_audio *data);
struct af_instance *af_control_any_rev(struct af_stream *s, int cmd, void *arg);
double af_calc_filter_multiplier(struct af_stream *s);
double af_calc_delay(struct af_stream *s);
int af_test_output(struct af_instance *af, struct mp_audio *out);
int af_from_dB(int n, float *in, float *out, float k, float mi, float ma);
int af_to_dB(int n, float *in, float *out, float k);
int af_from_ms(int n, float *in, int *out, int rate, float mi, float ma);
int af_to_ms(int n, int *in, float *out, int rate);
float af_softclip(float a);
#endif /* MPLAYER_AF_H */
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