| /* |
| * 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_BsdOS_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 |