--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/java.desktop/linux/native/libjsound/PLATFORM_API_LinuxOS_ALSA_Ports.c Fri Mar 23 09:51:02 2018 +0100
@@ -0,0 +1,724 @@
+/*
+ * Copyright (c) 2003, 2016, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation. Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code 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
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+#define USE_ERROR
+//#define USE_TRACE
+
+#include "Ports.h"
+#include "PLATFORM_API_LinuxOS_ALSA_CommonUtils.h"
+#include <alsa/asoundlib.h>
+
+#if USE_PORTS == TRUE
+
+#define MAX_ELEMS (300)
+#define MAX_CONTROLS (MAX_ELEMS * 4)
+
+#define CHANNELS_MONO (SND_MIXER_SCHN_LAST + 1)
+#define CHANNELS_STEREO (SND_MIXER_SCHN_LAST + 2)
+
+typedef struct {
+ snd_mixer_elem_t* elem;
+ INT32 portType; /* one of PORT_XXX_xx */
+ char* controlType; /* one of CONTROL_TYPE_xx */
+ /* Values: either SND_MIXER_SCHN_FRONT_xx, CHANNELS_MONO or CHANNELS_STEREO.
+ For SND_MIXER_SCHN_FRONT_xx, exactly this channel is set/retrieved directly.
+ For CHANNELS_MONO, ALSA channel SND_MIXER_SCHN_MONO is set/retrieved directly.
+ For CHANNELS_STEREO, ALSA channels SND_MIXER_SCHN_FRONT_LEFT and SND_MIXER_SCHN_FRONT_RIGHT
+ are set after a calculation that takes balance into account. Retrieved? Average of both
+ channels? (Using a cached value is not a good idea since the value in the HW may have been
+ altered.) */
+ INT32 channel;
+} PortControl;
+
+
+typedef struct tag_PortMixer {
+ snd_mixer_t* mixer_handle;
+ /* Number of array elements used in elems and types. */
+ int numElems;
+ snd_mixer_elem_t** elems;
+ /* Array of port types (PORT_SRC_UNKNOWN etc.). Indices are the same as in elems. */
+ INT32* types;
+ /* Number of array elements used in controls. */
+ int numControls;
+ PortControl* controls;
+} PortMixer;
+
+
+///// implemented functions of Ports.h
+
+INT32 PORT_GetPortMixerCount() {
+ INT32 mixerCount;
+ int card;
+ char devname[16];
+ int err;
+ snd_ctl_t *handle;
+ snd_ctl_card_info_t* info;
+
+ TRACE0("> PORT_GetPortMixerCount\n");
+
+ initAlsaSupport();
+
+ snd_ctl_card_info_malloc(&info);
+ card = -1;
+ mixerCount = 0;
+ if (snd_card_next(&card) >= 0) {
+ while (card >= 0) {
+ sprintf(devname, ALSA_HARDWARE_CARD, card);
+ TRACE1("PORT_GetPortMixerCount: Opening alsa device \"%s\"...\n", devname);
+ err = snd_ctl_open(&handle, devname, 0);
+ if (err < 0) {
+ ERROR2("ERROR: snd_ctl_open, card=%d: %s\n", card, snd_strerror(err));
+ } else {
+ mixerCount++;
+ snd_ctl_close(handle);
+ }
+ if (snd_card_next(&card) < 0) {
+ break;
+ }
+ }
+ }
+ snd_ctl_card_info_free(info);
+ TRACE0("< PORT_GetPortMixerCount\n");
+ return mixerCount;
+}
+
+
+INT32 PORT_GetPortMixerDescription(INT32 mixerIndex, PortMixerDescription* description) {
+ snd_ctl_t* handle;
+ snd_ctl_card_info_t* card_info;
+ char devname[16];
+ int err;
+ char buffer[100];
+
+ TRACE0("> PORT_GetPortMixerDescription\n");
+ snd_ctl_card_info_malloc(&card_info);
+
+ sprintf(devname, ALSA_HARDWARE_CARD, (int) mixerIndex);
+ TRACE1("Opening alsa device \"%s\"...\n", devname);
+ err = snd_ctl_open(&handle, devname, 0);
+ if (err < 0) {
+ ERROR2("ERROR: snd_ctl_open, card=%d: %s\n", (int) mixerIndex, snd_strerror(err));
+ return FALSE;
+ }
+ err = snd_ctl_card_info(handle, card_info);
+ if (err < 0) {
+ ERROR2("ERROR: snd_ctl_card_info, card=%d: %s\n", (int) mixerIndex, snd_strerror(err));
+ }
+ strncpy(description->name, snd_ctl_card_info_get_id(card_info), PORT_STRING_LENGTH - 1);
+ sprintf(buffer, " [%s]", devname);
+ strncat(description->name, buffer, PORT_STRING_LENGTH - 1 - strlen(description->name));
+ strncpy(description->vendor, "ALSA (http://www.alsa-project.org)", PORT_STRING_LENGTH - 1);
+ strncpy(description->description, snd_ctl_card_info_get_name(card_info), PORT_STRING_LENGTH - 1);
+ strncat(description->description, ", ", PORT_STRING_LENGTH - 1 - strlen(description->description));
+ strncat(description->description, snd_ctl_card_info_get_mixername(card_info), PORT_STRING_LENGTH - 1 - strlen(description->description));
+ getALSAVersion(description->version, PORT_STRING_LENGTH - 1);
+
+ snd_ctl_close(handle);
+ snd_ctl_card_info_free(card_info);
+ TRACE0("< PORT_GetPortMixerDescription\n");
+ return TRUE;
+}
+
+
+void* PORT_Open(INT32 mixerIndex) {
+ char devname[16];
+ snd_mixer_t* mixer_handle;
+ int err;
+ PortMixer* handle;
+
+ TRACE0("> PORT_Open\n");
+ sprintf(devname, ALSA_HARDWARE_CARD, (int) mixerIndex);
+ if ((err = snd_mixer_open(&mixer_handle, 0)) < 0) {
+ ERROR2("Mixer %s open error: %s", devname, snd_strerror(err));
+ return NULL;
+ }
+ if ((err = snd_mixer_attach(mixer_handle, devname)) < 0) {
+ ERROR2("Mixer attach %s error: %s", devname, snd_strerror(err));
+ snd_mixer_close(mixer_handle);
+ return NULL;
+ }
+ if ((err = snd_mixer_selem_register(mixer_handle, NULL, NULL)) < 0) {
+ ERROR1("Mixer register error: %s", snd_strerror(err));
+ snd_mixer_close(mixer_handle);
+ return NULL;
+ }
+ err = snd_mixer_load(mixer_handle);
+ if (err < 0) {
+ ERROR2("Mixer %s load error: %s", devname, snd_strerror(err));
+ snd_mixer_close(mixer_handle);
+ return NULL;
+ }
+ handle = (PortMixer*) calloc(1, sizeof(PortMixer));
+ if (handle == NULL) {
+ ERROR0("malloc() failed.");
+ snd_mixer_close(mixer_handle);
+ return NULL;
+ }
+ handle->numElems = 0;
+ handle->elems = (snd_mixer_elem_t**) calloc(MAX_ELEMS, sizeof(snd_mixer_elem_t*));
+ if (handle->elems == NULL) {
+ ERROR0("malloc() failed.");
+ snd_mixer_close(mixer_handle);
+ free(handle);
+ return NULL;
+ }
+ handle->types = (INT32*) calloc(MAX_ELEMS, sizeof(INT32));
+ if (handle->types == NULL) {
+ ERROR0("malloc() failed.");
+ snd_mixer_close(mixer_handle);
+ free(handle->elems);
+ free(handle);
+ return NULL;
+ }
+ handle->controls = (PortControl*) calloc(MAX_CONTROLS, sizeof(PortControl));
+ if (handle->controls == NULL) {
+ ERROR0("malloc() failed.");
+ snd_mixer_close(mixer_handle);
+ free(handle->elems);
+ free(handle->types);
+ free(handle);
+ return NULL;
+ }
+ handle->mixer_handle = mixer_handle;
+ // necessary to initialize data structures
+ PORT_GetPortCount(handle);
+ TRACE0("< PORT_Open\n");
+ return handle;
+}
+
+
+void PORT_Close(void* id) {
+ TRACE0("> PORT_Close\n");
+ if (id != NULL) {
+ PortMixer* handle = (PortMixer*) id;
+ if (handle->mixer_handle != NULL) {
+ snd_mixer_close(handle->mixer_handle);
+ }
+ if (handle->elems != NULL) {
+ free(handle->elems);
+ }
+ if (handle->types != NULL) {
+ free(handle->types);
+ }
+ if (handle->controls != NULL) {
+ free(handle->controls);
+ }
+ free(handle);
+ }
+ TRACE0("< PORT_Close\n");
+}
+
+
+
+INT32 PORT_GetPortCount(void* id) {
+ PortMixer* portMixer;
+ snd_mixer_elem_t *elem;
+
+ TRACE0("> PORT_GetPortCount\n");
+ if (id == NULL) {
+ // $$mp: Should become a descriptive error code (invalid handle).
+ return -1;
+ }
+ portMixer = (PortMixer*) id;
+ if (portMixer->numElems == 0) {
+ for (elem = snd_mixer_first_elem(portMixer->mixer_handle); elem; elem = snd_mixer_elem_next(elem)) {
+ if (!snd_mixer_selem_is_active(elem))
+ continue;
+ TRACE2("Simple mixer control '%s',%i\n",
+ snd_mixer_selem_get_name(elem),
+ snd_mixer_selem_get_index(elem));
+ if (snd_mixer_selem_has_playback_volume(elem)) {
+ portMixer->elems[portMixer->numElems] = elem;
+ portMixer->types[portMixer->numElems] = PORT_DST_UNKNOWN;
+ portMixer->numElems++;
+ }
+ // to prevent buffer overflow
+ if (portMixer->numElems >= MAX_ELEMS) {
+ break;
+ }
+ /* If an element has both playback an capture volume, it is put into the arrays
+ twice. */
+ if (snd_mixer_selem_has_capture_volume(elem)) {
+ portMixer->elems[portMixer->numElems] = elem;
+ portMixer->types[portMixer->numElems] = PORT_SRC_UNKNOWN;
+ portMixer->numElems++;
+ }
+ // to prevent buffer overflow
+ if (portMixer->numElems >= MAX_ELEMS) {
+ break;
+ }
+ }
+ }
+ TRACE0("< PORT_GetPortCount\n");
+ return portMixer->numElems;
+}
+
+
+INT32 PORT_GetPortType(void* id, INT32 portIndex) {
+ PortMixer* portMixer;
+ INT32 type;
+ TRACE0("> PORT_GetPortType\n");
+ if (id == NULL) {
+ // $$mp: Should become a descriptive error code (invalid handle).
+ return -1;
+ }
+ portMixer = (PortMixer*) id;
+ if (portIndex < 0 || portIndex >= portMixer->numElems) {
+ // $$mp: Should become a descriptive error code (index out of bounds).
+ return -1;
+ }
+ type = portMixer->types[portIndex];
+ TRACE0("< PORT_GetPortType\n");
+ return type;
+}
+
+
+INT32 PORT_GetPortName(void* id, INT32 portIndex, char* name, INT32 len) {
+ PortMixer* portMixer;
+ const char* nam;
+
+ TRACE0("> PORT_GetPortName\n");
+ if (id == NULL) {
+ // $$mp: Should become a descriptive error code (invalid handle).
+ return -1;
+ }
+ portMixer = (PortMixer*) id;
+ if (portIndex < 0 || portIndex >= portMixer->numElems) {
+ // $$mp: Should become a descriptive error code (index out of bounds).
+ return -1;
+ }
+ nam = snd_mixer_selem_get_name(portMixer->elems[portIndex]);
+ strncpy(name, nam, len - 1);
+ name[len - 1] = 0;
+ TRACE0("< PORT_GetPortName\n");
+ return TRUE;
+}
+
+
+static int isPlaybackFunction(INT32 portType) {
+ return (portType & PORT_DST_MASK);
+}
+
+
+/* Sets portControl to a pointer to the next free array element in the PortControl (pointer)
+ array of the passed portMixer. Returns TRUE if successful. May return FALSE if there is no
+ free slot. In this case, portControl is not altered */
+static int getControlSlot(PortMixer* portMixer, PortControl** portControl) {
+ if (portMixer->numControls >= MAX_CONTROLS) {
+ return FALSE;
+ } else {
+ *portControl = &(portMixer->controls[portMixer->numControls]);
+ portMixer->numControls++;
+ return TRUE;
+ }
+}
+
+
+/* Protect against illegal min-max values, preventing divisions by zero.
+ */
+inline static long getRange(long min, long max) {
+ if (max > min) {
+ return max - min;
+ } else {
+ return 1;
+ }
+}
+
+
+/* Idea: we may specify that if unit is an empty string, the values are linear and if unit is "dB",
+ the values are logarithmic.
+*/
+static void* createVolumeControl(PortControlCreator* creator,
+ PortControl* portControl,
+ snd_mixer_elem_t* elem, int isPlayback) {
+ void* control;
+ float precision;
+ long min, max;
+
+ if (isPlayback) {
+ snd_mixer_selem_get_playback_volume_range(elem, &min, &max);
+ } else {
+ snd_mixer_selem_get_capture_volume_range(elem, &min, &max);
+ }
+ /* $$mp: The volume values retrieved with the ALSA API are strongly supposed to be logarithmic.
+ So the following calculation is wrong. However, there is no correct calculation, since
+ for equal-distant logarithmic steps, the precision expressed in linear varies over the
+ scale. */
+ precision = 1.0F / getRange(min, max);
+ control = (creator->newFloatControl)(creator, portControl, CONTROL_TYPE_VOLUME, 0.0F, +1.0F, precision, "");
+ return control;
+}
+
+
+void PORT_GetControls(void* id, INT32 portIndex, PortControlCreator* creator) {
+ PortMixer* portMixer;
+ snd_mixer_elem_t* elem;
+ void* control;
+ PortControl* portControl;
+ void* controls[10];
+ int numControls;
+ char* portName;
+ int isPlayback = 0;
+ int isMono;
+ int isStereo;
+ char* type;
+ snd_mixer_selem_channel_id_t channel;
+ memset(controls, 0, sizeof(controls));
+
+ TRACE0("> PORT_GetControls\n");
+ if (id == NULL) {
+ ERROR0("Invalid handle!");
+ // $$mp: an error code should be returned.
+ return;
+ }
+ portMixer = (PortMixer*) id;
+ if (portIndex < 0 || portIndex >= portMixer->numElems) {
+ ERROR0("Port index out of range!");
+ // $$mp: an error code should be returned.
+ return;
+ }
+ numControls = 0;
+ elem = portMixer->elems[portIndex];
+ if (snd_mixer_selem_has_playback_volume(elem) || snd_mixer_selem_has_capture_volume(elem)) {
+ /* Since we've split/duplicated elements with both playback and capture on the recovery
+ of elements, we now can assume that we handle only to deal with either playback or
+ capture. */
+ isPlayback = isPlaybackFunction(portMixer->types[portIndex]);
+ isMono = (isPlayback && snd_mixer_selem_is_playback_mono(elem)) ||
+ (!isPlayback && snd_mixer_selem_is_capture_mono(elem));
+ isStereo = (isPlayback &&
+ snd_mixer_selem_has_playback_channel(elem, SND_MIXER_SCHN_FRONT_LEFT) &&
+ snd_mixer_selem_has_playback_channel(elem, SND_MIXER_SCHN_FRONT_RIGHT)) ||
+ (!isPlayback &&
+ snd_mixer_selem_has_capture_channel(elem, SND_MIXER_SCHN_FRONT_LEFT) &&
+ snd_mixer_selem_has_capture_channel(elem, SND_MIXER_SCHN_FRONT_RIGHT));
+ // single volume control
+ if (isMono || isStereo) {
+ if (getControlSlot(portMixer, &portControl)) {
+ portControl->elem = elem;
+ portControl->portType = portMixer->types[portIndex];
+ portControl->controlType = CONTROL_TYPE_VOLUME;
+ if (isMono) {
+ portControl->channel = CHANNELS_MONO;
+ } else {
+ portControl->channel = CHANNELS_STEREO;
+ }
+ control = createVolumeControl(creator, portControl, elem, isPlayback);
+ if (control != NULL) {
+ controls[numControls++] = control;
+ }
+ }
+ } else { // more than two channels, each channels has its own control.
+ for (channel = SND_MIXER_SCHN_FRONT_LEFT; channel <= SND_MIXER_SCHN_LAST; channel++) {
+ if ((isPlayback && snd_mixer_selem_has_playback_channel(elem, channel)) ||
+ (!isPlayback && snd_mixer_selem_has_capture_channel(elem, channel))) {
+ if (getControlSlot(portMixer, &portControl)) {
+ portControl->elem = elem;
+ portControl->portType = portMixer->types[portIndex];
+ portControl->controlType = CONTROL_TYPE_VOLUME;
+ portControl->channel = channel;
+ control = createVolumeControl(creator, portControl, elem, isPlayback);
+ // We wrap in a compound control to provide the channel name.
+ if (control != NULL) {
+ /* $$mp 2003-09-14: The following cast shouln't be necessary. Instead, the
+ declaration of PORT_NewCompoundControlPtr in Ports.h should be changed
+ to take a const char* parameter. */
+ control = (creator->newCompoundControl)(creator, (char*) snd_mixer_selem_channel_name(channel), &control, 1);
+ }
+ if (control != NULL) {
+ controls[numControls++] = control;
+ }
+ }
+ }
+ }
+ }
+ // BALANCE control
+ if (isStereo) {
+ if (getControlSlot(portMixer, &portControl)) {
+ portControl->elem = elem;
+ portControl->portType = portMixer->types[portIndex];
+ portControl->controlType = CONTROL_TYPE_BALANCE;
+ portControl->channel = CHANNELS_STEREO;
+ /* $$mp: The value for precision is chosen more or less arbitrarily. */
+ control = (creator->newFloatControl)(creator, portControl, CONTROL_TYPE_BALANCE, -1.0F, 1.0F, 0.01F, "");
+ if (control != NULL) {
+ controls[numControls++] = control;
+ }
+ }
+ }
+ }
+ if (snd_mixer_selem_has_playback_switch(elem) || snd_mixer_selem_has_capture_switch(elem)) {
+ if (getControlSlot(portMixer, &portControl)) {
+ type = isPlayback ? CONTROL_TYPE_MUTE : CONTROL_TYPE_SELECT;
+ portControl->elem = elem;
+ portControl->portType = portMixer->types[portIndex];
+ portControl->controlType = type;
+ control = (creator->newBooleanControl)(creator, portControl, type);
+ if (control != NULL) {
+ controls[numControls++] = control;
+ }
+ }
+ }
+ /* $$mp 2003-09-14: The following cast shouln't be necessary. Instead, the
+ declaration of PORT_NewCompoundControlPtr in Ports.h should be changed
+ to take a const char* parameter. */
+ portName = (char*) snd_mixer_selem_get_name(elem);
+ control = (creator->newCompoundControl)(creator, portName, controls, numControls);
+ if (control != NULL) {
+ (creator->addControl)(creator, control);
+ }
+ TRACE0("< PORT_GetControls\n");
+}
+
+
+INT32 PORT_GetIntValue(void* controlIDV) {
+ PortControl* portControl = (PortControl*) controlIDV;
+ int value = 0;
+ snd_mixer_selem_channel_id_t channel;
+
+ if (portControl != NULL) {
+ switch (portControl->channel) {
+ case CHANNELS_MONO:
+ channel = SND_MIXER_SCHN_MONO;
+ break;
+
+ case CHANNELS_STEREO:
+ channel = SND_MIXER_SCHN_FRONT_LEFT;
+ break;
+
+ default:
+ channel = portControl->channel;
+ }
+ if (portControl->controlType == CONTROL_TYPE_MUTE ||
+ portControl->controlType == CONTROL_TYPE_SELECT) {
+ if (isPlaybackFunction(portControl->portType)) {
+ snd_mixer_selem_get_playback_switch(portControl->elem, channel, &value);
+ } else {
+ snd_mixer_selem_get_capture_switch(portControl->elem, channel, &value);
+ }
+ if (portControl->controlType == CONTROL_TYPE_MUTE) {
+ value = ! value;
+ }
+ } else {
+ ERROR1("PORT_GetIntValue(): inappropriate control type: %s\n",
+ portControl->controlType);
+ }
+ }
+ return (INT32) value;
+}
+
+
+void PORT_SetIntValue(void* controlIDV, INT32 value) {
+ PortControl* portControl = (PortControl*) controlIDV;
+ snd_mixer_selem_channel_id_t channel;
+
+ if (portControl != NULL) {
+ if (portControl->controlType == CONTROL_TYPE_MUTE) {
+ value = ! value;
+ }
+ if (portControl->controlType == CONTROL_TYPE_MUTE ||
+ portControl->controlType == CONTROL_TYPE_SELECT) {
+ if (isPlaybackFunction(portControl->portType)) {
+ snd_mixer_selem_set_playback_switch_all(portControl->elem, value);
+ } else {
+ snd_mixer_selem_set_capture_switch_all(portControl->elem, value);
+ }
+ } else {
+ ERROR1("PORT_SetIntValue(): inappropriate control type: %s\n",
+ portControl->controlType);
+ }
+ }
+}
+
+
+static float scaleVolumeValueToNormalized(long value, long min, long max) {
+ return (float) (value - min) / getRange(min, max);
+}
+
+
+static long scaleVolumeValueToHardware(float value, long min, long max) {
+ return (long)(value * getRange(min, max) + min);
+}
+
+
+float getRealVolume(PortControl* portControl,
+ snd_mixer_selem_channel_id_t channel) {
+ float fValue;
+ long lValue = 0;
+ long min = 0;
+ long max = 0;
+
+ if (isPlaybackFunction(portControl->portType)) {
+ snd_mixer_selem_get_playback_volume_range(portControl->elem,
+ &min, &max);
+ snd_mixer_selem_get_playback_volume(portControl->elem,
+ channel, &lValue);
+ } else {
+ snd_mixer_selem_get_capture_volume_range(portControl->elem,
+ &min, &max);
+ snd_mixer_selem_get_capture_volume(portControl->elem,
+ channel, &lValue);
+ }
+ fValue = scaleVolumeValueToNormalized(lValue, min, max);
+ return fValue;
+}
+
+
+void setRealVolume(PortControl* portControl,
+ snd_mixer_selem_channel_id_t channel, float value) {
+ long lValue = 0;
+ long min = 0;
+ long max = 0;
+
+ if (isPlaybackFunction(portControl->portType)) {
+ snd_mixer_selem_get_playback_volume_range(portControl->elem,
+ &min, &max);
+ lValue = scaleVolumeValueToHardware(value, min, max);
+ snd_mixer_selem_set_playback_volume(portControl->elem,
+ channel, lValue);
+ } else {
+ snd_mixer_selem_get_capture_volume_range(portControl->elem,
+ &min, &max);
+ lValue = scaleVolumeValueToHardware(value, min, max);
+ snd_mixer_selem_set_capture_volume(portControl->elem,
+ channel, lValue);
+ }
+}
+
+
+static float getFakeBalance(PortControl* portControl) {
+ float volL, volR;
+
+ // pan is the ratio of left and right
+ volL = getRealVolume(portControl, SND_MIXER_SCHN_FRONT_LEFT);
+ volR = getRealVolume(portControl, SND_MIXER_SCHN_FRONT_RIGHT);
+ if (volL > volR) {
+ return -1.0f + (volR / volL);
+ }
+ else if (volR > volL) {
+ return 1.0f - (volL / volR);
+ }
+ return 0.0f;
+}
+
+
+static float getFakeVolume(PortControl* portControl) {
+ float valueL;
+ float valueR;
+ float value;
+
+ valueL = getRealVolume(portControl, SND_MIXER_SCHN_FRONT_LEFT);
+ valueR = getRealVolume(portControl, SND_MIXER_SCHN_FRONT_RIGHT);
+ // volume is the greater value of both
+ value = valueL > valueR ? valueL : valueR ;
+ return value;
+}
+
+
+/*
+ * sets the unsigned values for left and right volume according to
+ * the given volume (0...1) and balance (-1..0..+1)
+ */
+static void setFakeVolume(PortControl* portControl, float vol, float bal) {
+ float volumeLeft;
+ float volumeRight;
+
+ if (bal < 0.0f) {
+ volumeLeft = vol;
+ volumeRight = vol * (bal + 1.0f);
+ } else {
+ volumeLeft = vol * (1.0f - bal);
+ volumeRight = vol;
+ }
+ setRealVolume(portControl, SND_MIXER_SCHN_FRONT_LEFT, volumeLeft);
+ setRealVolume(portControl, SND_MIXER_SCHN_FRONT_RIGHT, volumeRight);
+}
+
+
+float PORT_GetFloatValue(void* controlIDV) {
+ PortControl* portControl = (PortControl*) controlIDV;
+ float value = 0.0F;
+
+ if (portControl != NULL) {
+ if (portControl->controlType == CONTROL_TYPE_VOLUME) {
+ switch (portControl->channel) {
+ case CHANNELS_MONO:
+ value = getRealVolume(portControl, SND_MIXER_SCHN_MONO);
+ break;
+
+ case CHANNELS_STEREO:
+ value = getFakeVolume(portControl);
+ break;
+
+ default:
+ value = getRealVolume(portControl, portControl->channel);
+ }
+ } else if (portControl->controlType == CONTROL_TYPE_BALANCE) {
+ if (portControl->channel == CHANNELS_STEREO) {
+ value = getFakeBalance(portControl);
+ } else {
+ ERROR0("PORT_GetFloatValue(): Balance only allowed for stereo channels!\n");
+ }
+ } else {
+ ERROR1("PORT_GetFloatValue(): inappropriate control type: %s!\n",
+ portControl->controlType);
+ }
+ }
+ return value;
+}
+
+
+void PORT_SetFloatValue(void* controlIDV, float value) {
+ PortControl* portControl = (PortControl*) controlIDV;
+
+ if (portControl != NULL) {
+ if (portControl->controlType == CONTROL_TYPE_VOLUME) {
+ switch (portControl->channel) {
+ case CHANNELS_MONO:
+ setRealVolume(portControl, SND_MIXER_SCHN_MONO, value);
+ break;
+
+ case CHANNELS_STEREO:
+ setFakeVolume(portControl, value, getFakeBalance(portControl));
+ break;
+
+ default:
+ setRealVolume(portControl, portControl->channel, value);
+ }
+ } else if (portControl->controlType == CONTROL_TYPE_BALANCE) {
+ if (portControl->channel == CHANNELS_STEREO) {
+ setFakeVolume(portControl, getFakeVolume(portControl), value);
+ } else {
+ ERROR0("PORT_SetFloatValue(): Balance only allowed for stereo channels!\n");
+ }
+ } else {
+ ERROR1("PORT_SetFloatValue(): inappropriate control type: %s!\n",
+ portControl->controlType);
+ }
+ }
+}
+
+
+#endif // USE_PORTS