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path: root/meta-ivi-common/recipes-multimedia/pulseaudio/pulseaudio-8.0/0002-volume-ramp-additions-to-the-low-level-infra.patch

blob: 9cee6f5de4e71adaa99a

--[[
    Copyright (C) 2018 "IoT.bzh"
    Author Romain Forlot <romain.forlot@iot.bzh>

    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at

      http://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.


    NOTE: strict mode: every global variables should be prefixed by '_'
--]]

function _subscribe(source, args)
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end

function _unsubscribe(source, args)
  AFB:success(source)
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  AFB:success(source)
end

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  AFB:success(source)
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  AFB:success(source)
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  AFB:success(source)
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From 7757059ffc6e63ea20ba9013682d72d619e7aefc Mon Sep 17 00:00:00 2001
From: Sangchul Lee <sangchul1011@gmail.com>
Date: Sat, 27 Aug 2016 21:33:16 +0900
Subject: [PATCH 2/6] volume ramp: additions to the low level infra

The original patch is
 - https://review.tizen.org/git/?p=platform/upstream/pulseaudio.git;a=commit;h=df1c4275ed79e0b708c75b92f9d247e0492bc1f0
 - by Jaska Uimonen <jaska.uimonen <at> helsinki.fi>

Signed-off-by: Sangchul Lee <sc11.lee@samsung.com>
---
 src/map-file        |   4 +
 src/pulse/def.h     |  13 ++-
 src/pulse/volume.c  |  74 ++++++++++++-
 src/pulse/volume.h  |  33 ++++++
 src/pulsecore/mix.c | 310 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/pulsecore/mix.h |  27 +++++
 6 files changed, 459 insertions(+), 2 deletions(-)

diff --git a/src/map-file b/src/map-file
index 93a62b8..ef9b57d 100644
--- a/src/map-file
+++ b/src/map-file
@@ -138,6 +138,10 @@ pa_cvolume_max_mask;
 pa_cvolume_merge;
 pa_cvolume_min;
 pa_cvolume_min_mask;
+pa_cvolume_ramp_equal;
+pa_cvolume_ramp_init;
+pa_cvolume_ramp_set;
+pa_cvolume_ramp_channel_ramp_set;
 pa_cvolume_remap;
 pa_cvolume_scale;
 pa_cvolume_scale_mask;
diff --git a/src/pulse/def.h b/src/pulse/def.h
index 680bdc9..bc3cedd 100644
--- a/src/pulse/def.h
+++ b/src/pulse/def.h
@@ -347,11 +347,15 @@ typedef enum pa_stream_flags {
      * consider absolute when the sink is in flat volume mode,
      * relative otherwise. \since 0.9.20 */
 
-    PA_STREAM_PASSTHROUGH = 0x80000U
+    PA_STREAM_PASSTHROUGH = 0x80000U,
     /**< Used to tag content that will be rendered by passthrough sinks.
      * The data will be left as is and not reformatted, resampled.
      * \since 1.0 */
 
+    PA_STREAM_START_RAMP_MUTED = 0x100000U
+    /**< Used to tag content that the stream will be started ramp volume
+     * muted so that you can nicely fade it in */
+
 } pa_stream_flags_t;
 
 /** \cond fulldocs */
@@ -380,6 +384,7 @@ typedef enum pa_stream_flags {
 #define PA_STREAM_FAIL_ON_SUSPEND PA_STREAM_FAIL_ON_SUSPEND
 #define PA_STREAM_RELATIVE_VOLUME PA_STREAM_RELATIVE_VOLUME
 #define PA_STREAM_PASSTHROUGH PA_STREAM_PASSTHROUGH
+#define PA_STREAM_START_RAMP_MUTED PA_STREAM_START_RAMP_MUTED
 
 /** \endcond */
 
@@ -1047,6 +1052,12 @@ typedef enum pa_port_available {
 /** \endcond */
 #endif
 
+/** \cond fulldocs */
+#define PA_VOLUMER_RAMP_TYPE_LINEAR PA_VOLUMER_RAMP_TYPE_LINEAR
+#define PA_VOLUMER_RAMP_TYPE_LOGARITHMIC PA_VOLUMER_RAMP_TYPE_LOGARITHMIC
+#define PA_VOLUMER_RAMP_TYPE_CUBIC PA_VOLUMER_RAMP_TYPE_CUBIC
+/** \endcond */
+
 PA_C_DECL_END
 
 #endif
diff --git a/src/pulse/volume.c b/src/pulse/volume.c
index 1667b94..85072c1 100644
--- a/src/pulse/volume.c
+++ b/src/pulse/volume.c
@@ -445,7 +445,10 @@ int pa_cvolume_channels_equal_to(const pa_cvolume *a, pa_volume_t v) {
     unsigned c;
     pa_assert(a);
 
-    pa_return_val_if_fail(pa_cvolume_valid(a), 0);
+    if (pa_cvolume_valid(a) == 0)
+        abort();
+
+    /* pa_return_val_if_fail(pa_cvolume_valid(a), 0); */
     pa_return_val_if_fail(PA_VOLUME_IS_VALID(v), 0);
 
     for (c = 0; c < a->channels; c++)
@@ -977,3 +980,72 @@ pa_cvolume* pa_cvolume_dec(pa_cvolume *v, pa_volume_t dec) {
 
     return pa_cvolume_scale(v, m);
 }
+
+int pa_cvolume_ramp_equal(const pa_cvolume_ramp *a, const pa_cvolume_ramp *b) {
+    int i;
+    pa_assert(a);
+    pa_assert(b);
+
+    if (PA_UNLIKELY(a == b))
+        return 1;
+
+    if (a->channels != b->channels)
+        return 0;
+
+    for (i = 0; i < a->channels; i++) {
+        if (a->ramps[i].type != b->ramps[i].type ||
+            a->ramps[i].length != b->ramps[i].length ||
+            a->ramps[i].target != b->ramps[i].target)
+            return 0;
+    }
+
+    return 1;
+}
+
+pa_cvolume_ramp* pa_cvolume_ramp_init(pa_cvolume_ramp *ramp) {
+    unsigned c;
+
+    pa_assert(ramp);
+
+    ramp->channels = 0;
+
+    for (c = 0; c < PA_CHANNELS_MAX; c++) {
+        ramp->ramps[c].type = PA_VOLUME_RAMP_TYPE_LINEAR;
+        ramp->ramps[c].length = 0;
+        ramp->ramps[c].target = PA_VOLUME_INVALID;
+    }
+
+    return ramp;
+}
+
+pa_cvolume_ramp* pa_cvolume_ramp_set(pa_cvolume_ramp *ramp, unsigned channels, pa_volume_ramp_type_t type, long time, pa_volume_t vol) {
+    int i;
+
+    pa_assert(ramp);
+    pa_assert(channels > 0);
+    pa_assert(time >= 0);
+    pa_assert(channels <= PA_CHANNELS_MAX);
+
+    ramp->channels = (uint8_t) channels;
+
+    for (i = 0; i < ramp->channels; i++) {
+        ramp->ramps[i].type = type;
+        ramp->ramps[i].length = time;
+        ramp->ramps[i].target = PA_CLAMP_VOLUME(vol);
+    }
+
+    return ramp;
+}
+
+pa_cvolume_ramp* pa_cvolume_ramp_channel_ramp_set(pa_cvolume_ramp *ramp, unsigned channel, pa_volume_ramp_type_t type, long time, pa_volume_t vol) {
+
+    pa_assert(ramp);
+    pa_assert(channel <= ramp->channels);
+    pa_assert(time >= 0);
+
+    ramp->ramps[channel].type = type;
+    ramp->ramps[channel].length = time;
+    ramp->ramps[channel].target = PA_CLAMP_VOLUME(vol);
+
+    return ramp;
+}
diff --git a/src/pulse/volume.h b/src/pulse/volume.h
index 8cf4fa4..2ae3451 100644
--- a/src/pulse/volume.h
+++ b/src/pulse/volume.h
@@ -431,6 +431,39 @@ pa_cvolume* pa_cvolume_inc(pa_cvolume *v, pa_volume_t inc);
  * the channels are kept. \since 0.9.16 */
 pa_cvolume* pa_cvolume_dec(pa_cvolume *v, pa_volume_t dec);
 
+/** Volume ramp type
+*/
+typedef enum pa_volume_ramp_type {
+    PA_VOLUME_RAMP_TYPE_LINEAR = 0,        /**< linear */
+    PA_VOLUME_RAMP_TYPE_LOGARITHMIC = 1,   /**< logarithmic */
+    PA_VOLUME_RAMP_TYPE_CUBIC = 2,
+} pa_volume_ramp_type_t;
+
+/** A structure encapsulating a volume ramp */
+typedef struct pa_volume_ramp_t {
+    pa_volume_ramp_type_t type;
+    long length;
+    pa_volume_t target;
+} pa_volume_ramp_t;
+
+/** A structure encapsulating a multichannel volume ramp */
+typedef struct pa_cvolume_ramp {
+    uint8_t channels;
+    pa_volume_ramp_t ramps[PA_CHANNELS_MAX];
+} pa_cvolume_ramp;
+
+/** Return non-zero when *a == *b */
+int pa_cvolume_ramp_equal(const pa_cvolume_ramp *a, const pa_cvolume_ramp *b);
+
+/** Init volume ramp struct */
+pa_cvolume_ramp* pa_cvolume_ramp_init(pa_cvolume_ramp *ramp);
+
+/** Set first n channels of ramp struct to certain value */
+pa_cvolume_ramp* pa_cvolume_ramp_set(pa_cvolume_ramp *ramp, unsigned channel, pa_volume_ramp_type_t type, long time, pa_volume_t vol);
+
+/** Set individual channel in the channel struct */
+pa_cvolume_ramp* pa_cvolume_ramp_channel_ramp_set(pa_cvolume_ramp *ramp, unsigned channel, pa_volume_ramp_type_t type, long time, pa_volume_t vol);
+
 PA_C_DECL_END
 
 #endif
diff --git a/src/pulsecore/mix.c b/src/pulsecore/mix.c
index 59622d7..1e4cc1e 100644
--- a/src/pulsecore/mix.c
+++ b/src/pulsecore/mix.c
@@ -724,3 +724,313 @@ void pa_volume_memchunk(
 
     pa_memblock_release(c->memblock);
 }
+
+static void calc_linear_integer_volume_no_mapping(int32_t linear[], float volume[], unsigned nchannels) {
+    unsigned channel, padding;
+
+    pa_assert(linear);
+    pa_assert(volume);
+
+    for (channel = 0; channel < nchannels; channel++)
+        linear[channel] = (int32_t) lrint(volume[channel] * 0x10000U);
+
+    for (padding = 0; padding < VOLUME_PADDING; padding++, channel++)
+        linear[channel] = linear[padding];
+}
+
+static void calc_linear_float_volume_no_mapping(float linear[], float volume[], unsigned nchannels) {
+    unsigned channel, padding;
+
+    pa_assert(linear);
+    pa_assert(volume);
+
+    for (channel = 0; channel < nchannels; channel++)
+        linear[channel] = volume[channel];
+
+    for (padding = 0; padding < VOLUME_PADDING; padding++, channel++)
+        linear[channel] = linear[padding];
+}
+
+typedef void (*pa_calc_volume_no_mapping_func_t) (void *volumes, float *volume, int channels);
+
+static const pa_calc_volume_no_mapping_func_t calc_volume_table_no_mapping[] = {
+  [PA_SAMPLE_U8]        = (pa_calc_volume_no_mapping_func_t) calc_linear_integer_volume_no_mapping,
+  [PA_SAMPLE_ALAW]      = (pa_calc_volume_no_mapping_func_t) calc_linear_integer_volume_no_mapping,
+  [PA_SAMPLE_ULAW]      = (pa_calc_volume_no_mapping_func_t) calc_linear_integer_volume_no_mapping,
+  [PA_SAMPLE_S16LE]     = (pa_calc_volume_no_mapping_func_t) calc_linear_integer_volume_no_mapping,
+  [PA_SAMPLE_S16BE]     = (pa_calc_volume_no_mapping_func_t) calc_linear_integer_volume_no_mapping,
+  [PA_SAMPLE_FLOAT32LE] = (pa_calc_volume_no_mapping_func_t) calc_linear_float_volume_no_mapping,
+  [PA_SAMPLE_FLOAT32BE] = (pa_calc_volume_no_mapping_func_t) calc_linear_float_volume_no_mapping,
+  [PA_SAMPLE_S32LE]     = (pa_calc_volume_no_mapping_func_t) calc_linear_integer_volume_no_mapping,
+  [PA_SAMPLE_S32BE]     = (pa_calc_volume_no_mapping_func_t) calc_linear_integer_volume_no_mapping,
+  [PA_SAMPLE_S24LE]     = (pa_calc_volume_no_mapping_func_t) calc_linear_integer_volume_no_mapping,
+  [PA_SAMPLE_S24BE]     = (pa_calc_volume_no_mapping_func_t) calc_linear_integer_volume_no_mapping,
+  [PA_SAMPLE_S24_32LE]  = (pa_calc_volume_no_mapping_func_t) calc_linear_integer_volume_no_mapping,
+  [PA_SAMPLE_S24_32BE]  = (pa_calc_volume_no_mapping_func_t) calc_linear_integer_volume_no_mapping
+};
+
+static const unsigned format_sample_size_table[] = {
+  [PA_SAMPLE_U8]        = 1,
+  [PA_SAMPLE_ALAW]      = 1,
+  [PA_SAMPLE_ULAW]      = 1,
+  [PA_SAMPLE_S16LE]     = 2,
+  [PA_SAMPLE_S16BE]     = 2,
+  [PA_SAMPLE_FLOAT32LE] = 4,
+  [PA_SAMPLE_FLOAT32BE] = 4,
+  [PA_SAMPLE_S32LE]     = 4,
+  [PA_SAMPLE_S32BE]     = 4,
+  [PA_SAMPLE_S24LE]     = 3,
+  [PA_SAMPLE_S24BE]     = 3,
+  [PA_SAMPLE_S24_32LE]  = 4,
+  [PA_SAMPLE_S24_32BE]  = 4
+};
+
+static float calc_volume_ramp_linear(pa_volume_ramp_int_t *ramp) {
+    pa_assert(ramp);
+    pa_assert(ramp->length > 0);
+
+    /* basic linear interpolation */
+    return ramp->start + (ramp->length - ramp->left) * (ramp->end - ramp->start) / (float) ramp->length;
+}
+
+static float calc_volume_ramp_logarithmic(pa_volume_ramp_int_t *ramp) {
+    float x_val, s, e;
+    long temp;
+
+    pa_assert(ramp);
+    pa_assert(ramp->length > 0);
+
+    if (ramp->end > ramp->start) {
+        temp = ramp->left;
+        s = ramp->end;
+        e = ramp->start;
+    } else {
+        temp = ramp->length - ramp->left;
+        s = ramp->start;
+        e = ramp->end;
+    }
+
+    x_val = temp == 0 ? 0.0 : powf(temp, 10);
+
+    /* base 10 logarithmic interpolation */
+    return s + x_val * (e - s) / powf(ramp->length, 10);
+}
+
+static float calc_volume_ramp_cubic(pa_volume_ramp_int_t *ramp) {
+    float x_val, s, e;
+    long temp;
+
+    pa_assert(ramp);
+    pa_assert(ramp->length > 0);
+
+    if (ramp->end > ramp->start) {
+        temp = ramp->left;
+        s = ramp->end;
+        e = ramp->start;
+    } else {
+        temp = ramp->length - ramp->left;
+        s = ramp->start;
+        e = ramp->end;
+    }
+
+    x_val = temp == 0 ? 0.0 : cbrtf(temp);
+
+    /* cubic interpolation */
+    return s + x_val * (e - s) / cbrtf(ramp->length);
+}
+
+typedef float (*pa_calc_volume_ramp_func_t) (pa_volume_ramp_int_t *);
+
+static const pa_calc_volume_ramp_func_t calc_volume_ramp_table[] = {
+    [PA_VOLUME_RAMP_TYPE_LINEAR] = (pa_calc_volume_ramp_func_t) calc_volume_ramp_linear,
+    [PA_VOLUME_RAMP_TYPE_LOGARITHMIC] = (pa_calc_volume_ramp_func_t) calc_volume_ramp_logarithmic,
+    [PA_VOLUME_RAMP_TYPE_CUBIC] = (pa_calc_volume_ramp_func_t) calc_volume_ramp_cubic
+};
+
+static void calc_volume_ramps(pa_cvolume_ramp_int *ram, float *vol)
+{
+    int i;
+
+    for (i = 0; i < ram->channels; i++) {
+        if (ram->ramps[i].left <= 0) {
+            if (ram->ramps[i].target == PA_VOLUME_NORM) {
+                vol[i] = 1.0;
+            }
+        } else {
+            vol[i] = ram->ramps[i].curr = calc_volume_ramp_table[ram->ramps[i].type] (&ram->ramps[i]);
+            ram->ramps[i].left--;
+        }
+    }
+}
+
+void pa_volume_ramp_memchunk(
+        pa_memchunk *c,
+        const pa_sample_spec *spec,
+        pa_cvolume_ramp_int *ramp) {
+
+    void *ptr;
+    volume_val linear[PA_CHANNELS_MAX + VOLUME_PADDING];
+    float vol[PA_CHANNELS_MAX + VOLUME_PADDING];
+    pa_do_volume_func_t do_volume;
+    long length_in_frames;
+    int i;
+
+    pa_assert(c);
+    pa_assert(spec);
+    pa_assert(pa_frame_aligned(c->length, spec));
+    pa_assert(ramp);
+
+    length_in_frames = c->length / format_sample_size_table[spec->format] / spec->channels;
+
+    if (pa_memblock_is_silence(c->memblock)) {
+        for (i = 0; i < ramp->channels; i++) {
+            if (ramp->ramps[i].length > 0)
+                ramp->ramps[i].length -= length_in_frames;
+        }
+        return;
+    }
+
+    if (spec->format < 0 || spec->format >= PA_SAMPLE_MAX) {
+      pa_log_warn("Unable to change volume of format");
+      return;
+    }
+
+    do_volume = pa_get_volume_func(spec->format);
+    pa_assert(do_volume);
+
+    ptr = (uint8_t*) pa_memblock_acquire(c->memblock) + c->index;
+
+    for (i = 0; i < length_in_frames; i++) {
+        calc_volume_ramps(ramp, vol);
+        calc_volume_table_no_mapping[spec->format] ((void *)linear, vol, spec->channels);
+
+        /* we only process one frame per iteration */
+        do_volume (ptr, (void *)linear, spec->channels, format_sample_size_table[spec->format] * spec->channels);
+
+        /* pa_log_debug("1: %d  2: %d", linear[0], linear[1]); */
+
+        ptr = (uint8_t*)ptr + format_sample_size_table[spec->format] * spec->channels;
+    }
+
+    pa_memblock_release(c->memblock);
+}
+
+pa_cvolume_ramp_int* pa_cvolume_ramp_convert(const pa_cvolume_ramp *src, pa_cvolume_ramp_int *dst, int sample_rate) {
+
+    int i, j, channels, remaining_channels;
+    float temp;
+
+    if (dst->channels < src->channels) {
+        channels = dst->channels;
+        remaining_channels = 0;
+    }
+    else {
+        channels = src->channels;
+        remaining_channels = dst->channels;
+    }
+
+    for (i = 0; i < channels; i++) {
+        dst->ramps[i].type = src->ramps[i].type;
+        /* ms to samples */
+        dst->ramps[i].length = src->ramps[i].length * sample_rate / 1000;
+        dst->ramps[i].left = dst->ramps[i].length;
+        dst->ramps[i].start = dst->ramps[i].end;
+        dst->ramps[i].target = src->ramps[i].target;
+        /* scale to pulse internal mapping so that when ramp is over there's no glitch in volume */
+        temp = src->ramps[i].target / (float)0x10000U;
+        dst->ramps[i].end = temp * temp * temp;
+    }
+
+    j = i;
+
+    for (i--; j < remaining_channels; j++) {
+        dst->ramps[j].type = dst->ramps[i].type;
+        dst->ramps[j].length = dst->ramps[i].length;
+        dst->ramps[j].left = dst->ramps[i].left;
+        dst->ramps[j].start = dst->ramps[i].start;
+        dst->ramps[j].target = dst->ramps[i].target;
+        dst->ramps[j].end = dst->ramps[i].end;
+    }
+
+    return dst;
+}
+
+bool pa_cvolume_ramp_active(pa_cvolume_ramp_int *ramp) {
+    int i;
+
+    for (i = 0; i < ramp->channels; i++) {
+        if (ramp->ramps[i].left > 0)
+            return true;
+    }
+
+    return false;
+}
+
+bool pa_cvolume_ramp_target_active(pa_cvolume_ramp_int *ramp) {
+    int i;
+
+    for (i = 0; i < ramp->channels; i++) {
+        if (ramp->ramps[i].target != PA_VOLUME_NORM)
+            return true;
+    }
+
+    return false;
+}
+
+pa_cvolume * pa_cvolume_ramp_get_targets(pa_cvolume_ramp_int *ramp, pa_cvolume *volume) {
+    int i = 0;
+
+    volume->channels = ramp->channels;
+
+    for (i = 0; i < ramp->channels; i++)
+        volume->values[i] = ramp->ramps[i].target;
+
+    return volume;
+}
+
+pa_cvolume_ramp_int* pa_cvolume_ramp_start_from(pa_cvolume_ramp_int *src, pa_cvolume_ramp_int *dst) {
+    int i;
+
+    for (i = 0; i < src->channels; i++) {
+        /* if new vols are invalid, copy old ramp i.e. no effect */
+        if (dst->ramps[i].target == PA_VOLUME_INVALID)
+            dst->ramps[i] = src->ramps[i];
+        /* if there's some old ramp still left */
+        else if (src->ramps[i].left > 0)
+            dst->ramps[i].start = src->ramps[i].curr;
+    }
+
+    return dst;
+}
+
+pa_cvolume_ramp_int* pa_cvolume_ramp_int_init(pa_cvolume_ramp_int *src, pa_volume_t vol, int channels) {
+    int i;
+    float temp;
+
+    src->channels = channels;
+
+    for (i = 0; i < channels; i++) {
+        src->ramps[i].type = PA_VOLUME_RAMP_TYPE_LINEAR;
+        src->ramps[i].length = 0;
+        src->ramps[i].left = 0;
+        if (vol == PA_VOLUME_NORM) {
+            src->ramps[i].start = 1.0;
+            src->ramps[i].end = 1.0;
+            src->ramps[i].curr = 1.0;
+        }
+        else if (vol == PA_VOLUME_MUTED) {
+            src->ramps[i].start = 0.0;
+            src->ramps[i].end = 0.0;
+            src->ramps[i].curr = 0.0;
+        }
+        else {
+            temp = vol / (float)0x10000U;
+            src->ramps[i].start = temp * temp * temp;
+            src->ramps[i].end = src->ramps[i].start;
+            src->ramps[i].curr = src->ramps[i].start;
+        }
+        src->ramps[i].target = vol;
+    }
+
+    return src;
+}
diff --git a/src/pulsecore/mix.h b/src/pulsecore/mix.h
index 8102bcd..0f86b6f 100644
--- a/src/pulsecore/mix.h
+++ b/src/pulsecore/mix.h
@@ -59,4 +59,31 @@ void pa_volume_memchunk(
     const pa_sample_spec *spec,
     const pa_cvolume *volume);
 
+typedef struct pa_volume_ramp_int_t {
+    pa_volume_ramp_type_t type;
+    long length;
+    long left;
+    float start;
+    float end;
+    float curr;
+    pa_volume_t target;
+} pa_volume_ramp_int_t;
+
+typedef struct pa_cvolume_ramp_int {
+    uint8_t channels;
+    pa_volume_ramp_int_t ramps[PA_CHANNELS_MAX];
+} pa_cvolume_ramp_int;
+
+pa_cvolume_ramp_int* pa_cvolume_ramp_convert(const pa_cvolume_ramp *src, pa_cvolume_ramp_int *dst, int sample_rate);
+bool pa_cvolume_ramp_active(pa_cvolume_ramp_int *ramp);
+bool pa_cvolume_ramp_target_active(pa_cvolume_ramp_int *ramp);
+pa_cvolume_ramp_int* pa_cvolume_ramp_start_from(pa_cvolume_ramp_int *src, pa_cvolume_ramp_int *dst);
+pa_cvolume_ramp_int* pa_cvolume_ramp_int_init(pa_cvolume_ramp_int *src, pa_volume_t vol, int channels);
+pa_cvolume * pa_cvolume_ramp_get_targets(pa_cvolume_ramp_int *ramp, pa_cvolume *volume);
+
+void pa_volume_ramp_memchunk(
+        pa_memchunk *c,
+        const pa_sample_spec *spec,
+        pa_cvolume_ramp_int *ramp);
+
 #endif
-- 
1.9.1