[PATCH] add module-virtual-surround-sink

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It provides a virtual surround sound effect

v2: Normalize hrir to avoid clipping, some cleanups
v3: use fabs, not abs
v4: implement changes proposed by Tanu Kaskinen
---
 src/Makefile.am                                    |    7 +
 ...rtual-sink.c => module-virtual-surround-sink.c} |  344 ++++++++++++++++----
 2 files changed, 288 insertions(+), 63 deletions(-)
 copy src/modules/{module-virtual-sink.c => module-virtual-surround-sink.c} (63%)

diff --git a/src/Makefile.am b/src/Makefile.am
index 521bf50..8f942f0 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -1009,6 +1009,7 @@ modlibexec_LTLIBRARIES += \
 		module-loopback.la \
 		module-virtual-sink.la \
 		module-virtual-source.la \
+		module-virtual-surround-sink.la \
 		module-switch-on-connect.la \
 		module-filter-apply.la \
 		module-filter-heuristics.la
@@ -1309,6 +1310,7 @@ SYMDEF_FILES = \
 		module-loopback-symdef.h \
 		module-virtual-sink-symdef.h \
 		module-virtual-source-symdef.h \
+		module-virtual-surround-sink-symdef.h \
 		module-switch-on-connect-symdef.h \
 		module-filter-apply-symdef.h \
 		module-filter-heuristics-symdef.h
@@ -1525,6 +1527,11 @@ module_virtual_source_la_CFLAGS = $(AM_CFLAGS) $(SERVER_CFLAGS)
 module_virtual_source_la_LDFLAGS = $(MODULE_LDFLAGS)
 module_virtual_source_la_LIBADD = $(MODULE_LIBADD)
 
+module_virtual_surround_sink_la_SOURCES = modules/module-virtual-surround-sink.c
+module_virtual_surround_sink_la_CFLAGS = $(AM_CFLAGS) $(SERVER_CFLAGS)
+module_virtual_surround_sink_la_LDFLAGS = $(MODULE_LDFLAGS)
+module_virtual_surround_sink_la_LIBADD = $(MODULE_LIBADD)
+
 # X11
 
 module_x11_bell_la_SOURCES = modules/x11/module-x11-bell.c
diff --git a/src/modules/module-virtual-sink.c b/src/modules/module-virtual-surround-sink.c
similarity index 63%
copy from src/modules/module-virtual-sink.c
copy to src/modules/module-virtual-surround-sink.c
index cf11ffa..d3dfe6f 100644
--- a/src/modules/module-virtual-sink.c
+++ b/src/modules/module-virtual-surround-sink.c
@@ -3,6 +3,7 @@
 
     Copyright 2010 Intel Corporation
     Contributor: Pierre-Louis Bossart <pierre-louis.bossart at intel.com>
+    Copyright 2012 Niels Ole Salscheider <niels_ole at salscheider-online.de>
 
     PulseAudio is free software; you can redistribute it and/or modify
     it under the terms of the GNU Lesser General Public License as published
@@ -37,11 +38,15 @@
 #include <pulsecore/rtpoll.h>
 #include <pulsecore/sample-util.h>
 #include <pulsecore/ltdl-helper.h>
+#include <pulsecore/sound-file.h>
+#include <pulsecore/resampler.h>
 
-#include "module-virtual-sink-symdef.h"
+#include <math.h>
 
-PA_MODULE_AUTHOR("Pierre-Louis Bossart");
-PA_MODULE_DESCRIPTION(_("Virtual sink"));
+#include "module-virtual-surround-sink-symdef.h"
+
+PA_MODULE_AUTHOR("Niels Ole Salscheider");
+PA_MODULE_DESCRIPTION(_("Virtual surround sink"));
 PA_MODULE_VERSION(PACKAGE_VERSION);
 PA_MODULE_LOAD_ONCE(FALSE);
 PA_MODULE_USAGE(
@@ -54,6 +59,8 @@ PA_MODULE_USAGE(
           "channel_map=<channel map> "
           "use_volume_sharing=<yes or no> "
           "force_flat_volume=<yes or no> "
+          "hrir=/path/to/left_hrir.wav "
+          "hrir_channel_map=<channel map> "
         ));
 
 #define MEMBLOCKQ_MAXLENGTH (16*1024*1024)
@@ -71,6 +78,23 @@ struct userdata {
 
     pa_bool_t auto_desc;
     unsigned channels;
+    unsigned hrir_channels;
+    unsigned master_channels;
+
+    unsigned fs, sink_fs;
+
+    unsigned *mapping_left;
+    unsigned *mapping_right;
+
+    unsigned output_left, output_right;
+
+    unsigned hrir_samples;
+    pa_sample_spec hrir_ss;
+    pa_channel_map hrir_map;
+    pa_memchunk hrir_chunk;
+
+    pa_memchunk input_buffer_chunk;
+    int input_buffer_offset;
 };
 
 static const char* const valid_modargs[] = {
@@ -83,6 +107,8 @@ static const char* const valid_modargs[] = {
     "channel_map",
     "use_volume_sharing",
     "force_flat_volume",
+    "hrir",
+    "hrir_channel_map",
     NULL
 };
 
@@ -198,10 +224,14 @@ static void sink_set_mute_cb(pa_sink *s) {
 static int sink_input_pop_cb(pa_sink_input *i, size_t nbytes, pa_memchunk *chunk) {
     struct userdata *u;
     float *src, *dst;
-    size_t fs;
-    unsigned n, c;
+    unsigned n;
     pa_memchunk tchunk;
-    pa_usec_t current_latency PA_GCC_UNUSED;
+
+    unsigned j, k, l;
+    float sum_right, sum_left;
+    float current_sample;
+    float *hrir_data;
+    float *input_buffer_data;
 
     pa_sink_input_assert_ref(i);
     pa_assert(chunk);
@@ -210,60 +240,69 @@ static int sink_input_pop_cb(pa_sink_input *i, size_t nbytes, pa_memchunk *chunk
     /* Hmm, process any rewind request that might be queued up */
     pa_sink_process_rewind(u->sink, 0);
 
-    /* (1) IF YOU NEED A FIXED BLOCK SIZE USE
-     * pa_memblockq_peek_fixed_size() HERE INSTEAD. NOTE THAT FILTERS
-     * WHICH CAN DEAL WITH DYNAMIC BLOCK SIZES ARE HIGHLY
-     * PREFERRED. */
     while (pa_memblockq_peek(u->memblockq, &tchunk) < 0) {
         pa_memchunk nchunk;
 
-        pa_sink_render(u->sink, nbytes, &nchunk);
+        pa_sink_render(u->sink, nbytes * u->sink_fs / u->fs, &nchunk);
         pa_memblockq_push(u->memblockq, &nchunk);
         pa_memblock_unref(nchunk.memblock);
     }
 
-    /* (2) IF YOU NEED A FIXED BLOCK SIZE, THIS NEXT LINE IS NOT
-     * NECESSARY */
-    tchunk.length = PA_MIN(nbytes, tchunk.length);
+    tchunk.length = PA_MIN(nbytes * u->sink_fs / u->fs, tchunk.length);
     pa_assert(tchunk.length > 0);
 
-    fs = pa_frame_size(&i->sample_spec);
-    n = (unsigned) (tchunk.length / fs);
+    n = (unsigned) (tchunk.length / u->sink_fs);
 
     pa_assert(n > 0);
 
     chunk->index = 0;
-    chunk->length = n*fs;
+    chunk->length = n * u->fs;
     chunk->memblock = pa_memblock_new(i->sink->core->mempool, chunk->length);
 
-    pa_memblockq_drop(u->memblockq, chunk->length);
+    pa_memblockq_drop(u->memblockq, n * u->sink_fs);
 
     src = (float*) ((uint8_t*) pa_memblock_acquire(tchunk.memblock) + tchunk.index);
     dst = (float*) pa_memblock_acquire(chunk->memblock);
+    hrir_data = (float*) pa_memblock_acquire(u->hrir_chunk.memblock);
+    input_buffer_data = (float*) pa_memblock_acquire(u->input_buffer_chunk.memblock);
+
+    for (l = 0; l < n; l++) {
+        memcpy(((char*) input_buffer_data) + u->input_buffer_offset * u->sink_fs, ((char *) src) + l * u->sink_fs, u->sink_fs);
 
-    /* (3) PUT YOUR CODE HERE TO DO SOMETHING WITH THE DATA */
+        sum_right = 0;
+        sum_left = 0;
 
-    /* As an example, copy input to output */
-    for (c = 0; c < u->channels; c++) {
-        pa_sample_clamp(PA_SAMPLE_FLOAT32NE,
-                        dst+c, u->channels * sizeof(float),
-                        src+c, u->channels * sizeof(float),
-                        n);
+        /* fold the input buffer with the impulse response */
+        for (j = 0; j < u->hrir_samples; j++) {
+            for (k = 0; k < u->channels; k++) {
+                current_sample = input_buffer_data[((u->input_buffer_offset + j) % u->hrir_samples) * u->channels + k];
+
+                sum_left += current_sample * hrir_data[j * u->hrir_channels + u->mapping_left[k]];
+                sum_right += current_sample * hrir_data[j * u->hrir_channels + u->mapping_right[k]];
+            }
+        }
+
+        for (k = 0; k < u->master_channels; k++) {
+            if (k == u->output_left)
+                dst[u->master_channels * l + k] = PA_CLAMP_UNLIKELY(sum_left, -1.0f, 1.0f);
+            else if (k == u->output_right)
+                dst[u->master_channels * l + k] = PA_CLAMP_UNLIKELY(sum_right, -1.0f, 1.0f);
+            else
+                dst[u->master_channels * l + k] = 0;
+        }
+
+        u->input_buffer_offset--;
+        if (u->input_buffer_offset < 0)
+            u->input_buffer_offset += u->hrir_samples;
     }
 
     pa_memblock_release(tchunk.memblock);
     pa_memblock_release(chunk->memblock);
+    pa_memblock_release(u->hrir_chunk.memblock);
+    pa_memblock_release(u->input_buffer_chunk.memblock);
 
     pa_memblock_unref(tchunk.memblock);
 
-    /* (4) IF YOU NEED THE LATENCY FOR SOMETHING ACQUIRE IT LIKE THIS: */
-    current_latency =
-        /* Get the latency of the master sink */
-        pa_sink_get_latency_within_thread(i->sink) +
-
-        /* Add the latency internal to our sink input on top */
-        pa_bytes_to_usec(pa_memblockq_get_length(i->thread_info.render_memblockq), &i->sink->sample_spec);
-
     return 0;
 }
 
@@ -271,6 +310,7 @@ static int sink_input_pop_cb(pa_sink_input *i, size_t nbytes, pa_memchunk *chunk
 static void sink_input_process_rewind_cb(pa_sink_input *i, size_t nbytes) {
     struct userdata *u;
     size_t amount = 0;
+    char *input_buffer;
 
     pa_sink_input_assert_ref(i);
     pa_assert_se(u = i->userdata);
@@ -278,19 +318,23 @@ static void sink_input_process_rewind_cb(pa_sink_input *i, size_t nbytes) {
     if (u->sink->thread_info.rewind_nbytes > 0) {
         size_t max_rewrite;
 
-        max_rewrite = nbytes + pa_memblockq_get_length(u->memblockq);
-        amount = PA_MIN(u->sink->thread_info.rewind_nbytes, max_rewrite);
+        max_rewrite = nbytes * u->sink_fs / u->fs + pa_memblockq_get_length(u->memblockq);
+        amount = PA_MIN(u->sink->thread_info.rewind_nbytes * u->sink_fs / u->fs, max_rewrite);
         u->sink->thread_info.rewind_nbytes = 0;
 
         if (amount > 0) {
             pa_memblockq_seek(u->memblockq, - (int64_t) amount, PA_SEEK_RELATIVE, TRUE);
 
-            /* (5) PUT YOUR CODE HERE TO RESET YOUR FILTER  */
+            /* Reset the input buffer */
+            input_buffer = (char *) pa_memblock_acquire(u->input_buffer_chunk.memblock);
+            memset(input_buffer, 0, u->input_buffer_chunk.length);
+            pa_memblock_release(u->input_buffer_chunk.memblock);
+            u->input_buffer_offset = 0;
         }
     }
 
     pa_sink_process_rewind(u->sink, amount);
-    pa_memblockq_rewind(u->memblockq, nbytes);
+    pa_memblockq_rewind(u->memblockq, nbytes * u->sink_fs / u->fs);
 }
 
 /* Called from I/O thread context */
@@ -300,8 +344,8 @@ static void sink_input_update_max_rewind_cb(pa_sink_input *i, size_t nbytes) {
     pa_sink_input_assert_ref(i);
     pa_assert_se(u = i->userdata);
 
-    pa_memblockq_set_maxrewind(u->memblockq, nbytes);
-    pa_sink_set_max_rewind_within_thread(u->sink, nbytes);
+    pa_memblockq_set_maxrewind(u->memblockq, nbytes * u->sink_fs / u->fs);
+    pa_sink_set_max_rewind_within_thread(u->sink, nbytes * u->sink_fs / u->fs);
 }
 
 /* Called from I/O thread context */
@@ -311,10 +355,7 @@ static void sink_input_update_max_request_cb(pa_sink_input *i, size_t nbytes) {
     pa_sink_input_assert_ref(i);
     pa_assert_se(u = i->userdata);
 
-    /* (6) IF YOU NEED A FIXED BLOCK SIZE ROUND nbytes UP TO MULTIPLES
-     * OF IT HERE. THE PA_ROUND_UP MACRO IS USEFUL FOR THAT. */
-
-    pa_sink_set_max_request_within_thread(u->sink, nbytes);
+    pa_sink_set_max_request_within_thread(u->sink, nbytes * u->sink_fs / u->fs);
 }
 
 /* Called from I/O thread context */
@@ -334,10 +375,6 @@ static void sink_input_update_sink_fixed_latency_cb(pa_sink_input *i) {
     pa_sink_input_assert_ref(i);
     pa_assert_se(u = i->userdata);
 
-    /* (7) IF YOU NEED A FIXED BLOCK SIZE ADD THE LATENCY FOR ONE
-     * BLOCK MINUS ONE SAMPLE HERE. pa_usec_to_bytes_round_up() IS
-     * USEFUL FOR THAT. */
-
     pa_sink_set_fixed_latency_within_thread(u->sink, i->sink->thread_info.fixed_latency);
 }
 
@@ -363,13 +400,8 @@ static void sink_input_attach_cb(pa_sink_input *i) {
     pa_sink_set_rtpoll(u->sink, i->sink->thread_info.rtpoll);
     pa_sink_set_latency_range_within_thread(u->sink, i->sink->thread_info.min_latency, i->sink->thread_info.max_latency);
 
-    /* (8.1) IF YOU NEED A FIXED BLOCK SIZE ADD THE LATENCY FOR ONE
-     * BLOCK MINUS ONE SAMPLE HERE. SEE (7) */
     pa_sink_set_fixed_latency_within_thread(u->sink, i->sink->thread_info.fixed_latency);
 
-    /* (8.2) IF YOU NEED A FIXED BLOCK SIZE ROUND
-     * pa_sink_input_get_max_request(i) UP TO MULTIPLES OF IT
-     * HERE. SEE (6) */
     pa_sink_set_max_request_within_thread(u->sink, pa_sink_input_get_max_request(i));
     pa_sink_set_max_rewind_within_thread(u->sink, pa_sink_input_get_max_rewind(i));
 
@@ -471,10 +503,53 @@ static void sink_input_mute_changed_cb(pa_sink_input *i) {
     pa_sink_mute_changed(u->sink, i->muted);
 }
 
+static pa_channel_position_t mirror_channel(pa_channel_position_t channel) {
+    switch (channel) {
+    case PA_CHANNEL_POSITION_FRONT_LEFT:
+        return PA_CHANNEL_POSITION_FRONT_RIGHT;
+
+    case PA_CHANNEL_POSITION_FRONT_RIGHT:
+        return PA_CHANNEL_POSITION_FRONT_LEFT;
+
+    case PA_CHANNEL_POSITION_REAR_LEFT:
+        return PA_CHANNEL_POSITION_REAR_RIGHT;
+
+    case PA_CHANNEL_POSITION_REAR_RIGHT:
+        return PA_CHANNEL_POSITION_REAR_LEFT;
+
+    case PA_CHANNEL_POSITION_SIDE_LEFT:
+        return PA_CHANNEL_POSITION_SIDE_RIGHT;
+
+    case PA_CHANNEL_POSITION_SIDE_RIGHT:
+        return PA_CHANNEL_POSITION_SIDE_LEFT;
+
+    case PA_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER:
+        return PA_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER;
+
+    case PA_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER:
+        return PA_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER;
+
+    case PA_CHANNEL_POSITION_TOP_FRONT_LEFT:
+        return PA_CHANNEL_POSITION_TOP_FRONT_RIGHT;
+
+    case PA_CHANNEL_POSITION_TOP_FRONT_RIGHT:
+        return PA_CHANNEL_POSITION_TOP_FRONT_LEFT;
+
+    case PA_CHANNEL_POSITION_TOP_REAR_LEFT:
+        return PA_CHANNEL_POSITION_TOP_REAR_RIGHT;
+
+    case PA_CHANNEL_POSITION_TOP_REAR_RIGHT:
+        return PA_CHANNEL_POSITION_TOP_REAR_LEFT;
+
+    default:
+        return channel;
+    }
+}
+
 int pa__init(pa_module*m) {
     struct userdata *u;
-    pa_sample_spec ss;
-    pa_channel_map map;
+    pa_sample_spec ss, sink_input_ss;
+    pa_channel_map map, sink_input_map;
     pa_modargs *ma;
     pa_sink *master=NULL;
     pa_sink_input_new_data sink_input_data;
@@ -483,6 +558,17 @@ int pa__init(pa_module*m) {
     pa_bool_t force_flat_volume = FALSE;
     pa_memchunk silence;
 
+    const char *hrir_file;
+    char *input_buffer;
+    unsigned i, j, found_channel;
+    float hrir_sum, hrir_max;
+    float *hrir_data;
+
+    pa_sample_spec hrir_temp_ss;
+    pa_channel_map hrir_temp_map;
+    pa_memchunk hrir_temp_chunk;
+    pa_resampler *resampler;
+
     pa_assert(m);
 
     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
@@ -497,13 +583,15 @@ int pa__init(pa_module*m) {
 
     pa_assert(master);
 
-    ss = master->sample_spec;
+    /* sample spec of sink */
+    ss.rate = master->sample_spec.rate;
     ss.format = PA_SAMPLE_FLOAT32;
-    map = master->channel_map;
-    if (pa_modargs_get_sample_spec_and_channel_map(ma, &ss, &map, PA_CHANNEL_MAP_DEFAULT) < 0) {
-        pa_log("Invalid sample format specification or channel map");
+    ss.channels = 6;    /* default to 6 channels */
+    if (pa_modargs_get_sample_spec(ma, &ss) < 0) {
+        pa_log("Invalid sample format specification");
         goto fail;
     }
+    ss.format = PA_SAMPLE_FLOAT32;
 
     if (pa_modargs_get_value_boolean(ma, "use_volume_sharing", &use_volume_sharing) < 0) {
         pa_log("use_volume_sharing= expects a boolean argument");
@@ -524,6 +612,53 @@ int pa__init(pa_module*m) {
     u->module = m;
     m->userdata = u;
     u->channels = ss.channels;
+    u->master_channels = 2;
+
+    /* Initialize hrir and input buffer */
+    /* this is the hrir file for the left ear! */
+    hrir_file = pa_modargs_get_value(ma, "hrir", NULL);
+
+    if (pa_sound_file_load(master->core->mempool, hrir_file, &hrir_temp_ss, &hrir_temp_map, &hrir_temp_chunk, NULL) < 0) {
+        pa_log("Cannot load hrir file.");
+        goto fail;
+    }
+
+    /* sample spec / map of hrir */
+    u->hrir_ss.format = ss.format;
+    u->hrir_ss.rate = ss.rate;
+    u->hrir_ss.channels = hrir_temp_ss.channels;
+
+    /* default hrir channel map */
+    if (u->hrir_ss.channels == 6) {
+        u->hrir_map.channels = 6;
+        u->hrir_map.map[0] = PA_CHANNEL_POSITION_FRONT_LEFT;
+        u->hrir_map.map[1] = PA_CHANNEL_POSITION_FRONT_RIGHT;
+        u->hrir_map.map[2] = PA_CHANNEL_POSITION_FRONT_CENTER;
+        u->hrir_map.map[3] = PA_CHANNEL_POSITION_LFE;
+        u->hrir_map.map[4] = PA_CHANNEL_POSITION_REAR_LEFT;
+        u->hrir_map.map[5] = PA_CHANNEL_POSITION_REAR_RIGHT;
+    }
+
+    if (pa_modargs_get_channel_map(ma, "hrir_channel_map", &u->hrir_map) < 0) {
+        pa_log("Invalid hrir channel map");
+        goto fail;
+    }
+
+    /* map of sink */
+    map = u->hrir_map;
+    if (pa_modargs_get_channel_map(ma, NULL, &map) < 0) {
+        pa_log("Invalid channel map");
+        goto fail;
+    }
+
+    /* sample spec / map of sink input */
+    pa_channel_map_init_stereo(&sink_input_map);
+    sink_input_ss.channels = 2;
+    sink_input_ss.format = PA_SAMPLE_FLOAT32;
+    sink_input_ss.rate = ss.rate;
+
+    u->sink_fs = pa_frame_size(&ss);
+    u->fs = pa_frame_size(&sink_input_ss);
 
     /* Create sink */
     pa_sink_new_data_init(&sink_data);
@@ -583,8 +718,8 @@ int pa__init(pa_module*m) {
     sink_input_data.origin_sink = u->sink;
     pa_proplist_setf(sink_input_data.proplist, PA_PROP_MEDIA_NAME, "Virtual Sink Stream from %s", pa_proplist_gets(u->sink->proplist, PA_PROP_DEVICE_DESCRIPTION));
     pa_proplist_sets(sink_input_data.proplist, PA_PROP_MEDIA_ROLE, "filter");
-    pa_sink_input_new_data_set_sample_spec(&sink_input_data, &ss);
-    pa_sink_input_new_data_set_channel_map(&sink_input_data, &map);
+    pa_sink_input_new_data_set_sample_spec(&sink_input_data, &sink_input_ss);
+    pa_sink_input_new_data_set_channel_map(&sink_input_data, &sink_input_map);
 
     pa_sink_input_new(&u->sink_input, m->core, &sink_input_data);
     pa_sink_input_new_data_done(&sink_input_data);
@@ -611,16 +746,88 @@ int pa__init(pa_module*m) {
     u->sink->input_to_master = u->sink_input;
 
     pa_sink_input_get_silence(u->sink_input, &silence);
-    u->memblockq = pa_memblockq_new("module-virtual-sink memblockq", 0, MEMBLOCKQ_MAXLENGTH, 0, &ss, 1, 1, 0, &silence);
+    u->memblockq = pa_memblockq_new("module-virtual-surround-sink memblockq", 0, MEMBLOCKQ_MAXLENGTH, 0, &sink_input_ss, 1, 1, 0, &silence);
     pa_memblock_unref(silence.memblock);
 
-    /* (9) INITIALIZE ANYTHING ELSE YOU NEED HERE */
+    /* resample hrir */
+    resampler = pa_resampler_new(u->sink->core->mempool, &hrir_temp_ss, &u->hrir_map, &u->hrir_ss, &u->hrir_map,
+                                 PA_RESAMPLER_SRC_SINC_BEST_QUALITY, PA_RESAMPLER_NO_REMAP);
+    pa_resampler_run(resampler, &hrir_temp_chunk, &u->hrir_chunk);
+    pa_resampler_free(resampler);
+    pa_memblock_unref(hrir_temp_chunk.memblock);
+
+    u->hrir_samples =  u->hrir_chunk.length / pa_frame_size(&u->hrir_ss);
+    u->hrir_channels = u->hrir_ss.channels;
+
+    if (u->hrir_map.channels != u->hrir_channels) {
+        pa_log("number of channels in hrir file does not match number of channels in hrir channel map");
+        goto fail;
+    }
+
+    if (u->hrir_map.channels < map.channels) {
+        pa_log("hrir file does not have enough channels!");
+        goto fail;
+    }
+
+    /* normalize hrir to avoid clipping */
+    hrir_data = (float*) pa_memblock_acquire(u->hrir_chunk.memblock);
+    hrir_max = 0;
+    for (i = 0; i < u->hrir_samples; i++) {
+        hrir_sum = 0;
+        for (j = 0; j < u->hrir_channels; j++)
+            hrir_sum += fabs(hrir_data[i * u->hrir_channels + j]);
+
+        if (hrir_sum > hrir_max)
+            hrir_max = hrir_sum;
+    }
+    if (hrir_max > 1) {
+        for (i = 0; i < u->hrir_samples; i++) {
+            for (j = 0; j < u->hrir_channels; j++)
+                hrir_data[i * u->hrir_channels + j] /= hrir_max * 1.2;
+        }
+    }
+    pa_memblock_release(u->hrir_chunk.memblock);
+
+    /* create mapping between hrir and input */
+    u->mapping_left = (unsigned *) pa_xnew0(unsigned, u->channels);
+    u->mapping_right = (unsigned *) pa_xnew0(unsigned, u->channels);
+    for (i = 0; i < map.channels; i++) {
+        found_channel = 0;
+
+        for (j = 0; j < u->hrir_map.channels; j++) {
+            if (u->hrir_map.map[j] == map.map[i]) {
+                u->mapping_left[i] = j;
+                found_channel = 1;
+            }
+
+            if (u->hrir_map.map[j] == mirror_channel(map.map[i]))
+                u->mapping_right[i] = j;
+        }
+
+        if (!found_channel) {
+            pa_log("Cannot find mapping for channel %s", pa_channel_position_to_string(map.map[i]));
+            goto fail;
+        }
+
+        if (map.map[i] == PA_CHANNEL_POSITION_FRONT_LEFT)
+            u->output_left = i;
+        if (map.map[i] == PA_CHANNEL_POSITION_FRONT_RIGHT)
+            u->output_right = i;
+    }
+
+    u->input_buffer_chunk.length = u->hrir_chunk.length;
+    u->input_buffer_chunk.index = 0;
+    u->input_buffer_chunk.memblock = pa_memblock_new_pool(u->sink->core->mempool, u->input_buffer_chunk.length);
+
+    input_buffer = (char *) pa_memblock_acquire(u->input_buffer_chunk.memblock);
+    memset(input_buffer, 0, u->input_buffer_chunk.length);
+    pa_memblock_release(u->input_buffer_chunk.memblock);
+    u->input_buffer_offset = 0;
 
     pa_sink_put(u->sink);
     pa_sink_input_put(u->sink_input);
 
     pa_modargs_free(ma);
-
     return 0;
 
 fail:
@@ -667,5 +874,16 @@ void pa__done(pa_module*m) {
     if (u->memblockq)
         pa_memblockq_free(u->memblockq);
 
+    if (u->hrir_chunk.memblock)
+        pa_memblock_unref(u->hrir_chunk.memblock);
+
+    if (u->input_buffer_chunk.memblock)
+        pa_memblock_unref(u->input_buffer_chunk.memblock);
+
+    if (u->mapping_left)
+        pa_xfree(u->mapping_left);
+    if (u->mapping_right)
+        pa_xfree(u->mapping_right);
+
     pa_xfree(u);
 }
-- 
1.7.8.4


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