From 95a98fe6f2002c9dd448b70bb6944541b5616df3 Mon Sep 17 00:00:00 2001 From: Lennart Poettering Date: Sat, 24 Nov 2007 16:26:49 +0000 Subject: Add new subsystem for applying envelopes (such as volume ramps) to audio signals git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@2082 fefdeb5f-60dc-0310-8127-8f9354f1896f --- src/pulsecore/envelope.h | 55 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 55 insertions(+) create mode 100644 src/pulsecore/envelope.h (limited to 'src/pulsecore/envelope.h') diff --git a/src/pulsecore/envelope.h b/src/pulsecore/envelope.h new file mode 100644 index 00000000..23be8f6a --- /dev/null +++ b/src/pulsecore/envelope.h @@ -0,0 +1,55 @@ +#ifndef foopulseenvelopehfoo +#define foopulseenvelopehfoo + +/* $Id$ */ + +/*** + This file is part of PulseAudio. + + Copyright 2007 Lennart Poettering + + PulseAudio is free software; you can redistribute it and/or modify + it under the terms of the GNU Lesser General Public License as + published by the Free Software Foundation; either version 2.1 of the + License, or (at your option) any later version. + + PulseAudio 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with PulseAudio; if not, write to the Free Software + Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 + USA. +***/ + +#include +#include + +#include + +#define PA_ENVELOPE_POINTS_MAX 4 + +typedef struct pa_envelope pa_envelope; +typedef struct pa_envelope_item pa_envelope_item; + +typedef struct pa_envelope_def { + unsigned n_points; + + pa_usec_t points_x[PA_ENVELOPE_POINTS_MAX]; + struct { + int32_t i[PA_ENVELOPE_POINTS_MAX]; + float f[PA_ENVELOPE_POINTS_MAX]; + } points_y; +} pa_envelope_def; + +pa_envelope *pa_envelope_new(const pa_sample_spec *ss); +void pa_envelope_free(pa_envelope *e); +pa_envelope_item *pa_envelope_add(pa_envelope *e, const pa_envelope_def *def); +pa_envelope_item *pa_envelope_replace(pa_envelope *e, pa_envelope_item *i, const pa_envelope_def *def); +void pa_envelope_remove(pa_envelope *e, pa_envelope_item *i); +void pa_envelope_apply(pa_envelope *e, pa_memchunk *chunk); +void pa_envelope_rewind(pa_envelope *e, size_t n_bytes); + +#endif -- cgit