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/*
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* Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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#define USE_ERROR
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//#define USE_TRACE
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#include "Ports.h"
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#include "PLATFORM_API_BsdOS_ALSA_CommonUtils.h"
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#include <alsa/asoundlib.h>
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#if USE_PORTS == TRUE
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#define MAX_ELEMS (300)
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#define MAX_CONTROLS (MAX_ELEMS * 4)
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#define CHANNELS_MONO (SND_MIXER_SCHN_LAST + 1)
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#define CHANNELS_STEREO (SND_MIXER_SCHN_LAST + 2)
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typedef struct {
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snd_mixer_elem_t* elem;
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INT32 portType; /* one of PORT_XXX_xx */
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char* controlType; /* one of CONTROL_TYPE_xx */
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/* Values: either SND_MIXER_SCHN_FRONT_xx, CHANNELS_MONO or CHANNELS_STEREO.
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For SND_MIXER_SCHN_FRONT_xx, exactly this channel is set/retrieved directly.
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For CHANNELS_MONO, ALSA channel SND_MIXER_SCHN_MONO is set/retrieved directly.
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For CHANNELS_STEREO, ALSA channels SND_MIXER_SCHN_FRONT_LEFT and SND_MIXER_SCHN_FRONT_RIGHT
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are set after a calculation that takes balance into account. Retrieved? Average of both
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channels? (Using a cached value is not a good idea since the value in the HW may have been
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altered.) */
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INT32 channel;
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} PortControl;
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typedef struct tag_PortMixer {
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snd_mixer_t* mixer_handle;
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/* Number of array elements used in elems and types. */
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int numElems;
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snd_mixer_elem_t** elems;
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/* Array of port types (PORT_SRC_UNKNOWN etc.). Indices are the same as in elems. */
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INT32* types;
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/* Number of array elements used in controls. */
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int numControls;
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PortControl* controls;
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} PortMixer;
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///// implemented functions of Ports.h
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INT32 PORT_GetPortMixerCount() {
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INT32 mixerCount;
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int card;
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char devname[16];
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int err;
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snd_ctl_t *handle;
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snd_ctl_card_info_t* info;
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TRACE0("> PORT_GetPortMixerCount\n");
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initAlsaSupport();
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snd_ctl_card_info_malloc(&info);
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card = -1;
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mixerCount = 0;
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if (snd_card_next(&card) >= 0) {
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while (card >= 0) {
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sprintf(devname, ALSA_HARDWARE_CARD, card);
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TRACE1("PORT_GetPortMixerCount: Opening alsa device \"%s\"...\n", devname);
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err = snd_ctl_open(&handle, devname, 0);
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if (err < 0) {
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ERROR2("ERROR: snd_ctl_open, card=%d: %s\n", card, snd_strerror(err));
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} else {
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mixerCount++;
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snd_ctl_close(handle);
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}
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if (snd_card_next(&card) < 0) {
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break;
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}
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}
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}
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snd_ctl_card_info_free(info);
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TRACE0("< PORT_GetPortMixerCount\n");
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return mixerCount;
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}
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INT32 PORT_GetPortMixerDescription(INT32 mixerIndex, PortMixerDescription* description) {
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snd_ctl_t* handle;
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snd_ctl_card_info_t* card_info;
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char devname[16];
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int err;
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char buffer[100];
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TRACE0("> PORT_GetPortMixerDescription\n");
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snd_ctl_card_info_malloc(&card_info);
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sprintf(devname, ALSA_HARDWARE_CARD, (int) mixerIndex);
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TRACE1("Opening alsa device \"%s\"...\n", devname);
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err = snd_ctl_open(&handle, devname, 0);
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if (err < 0) {
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ERROR2("ERROR: snd_ctl_open, card=%d: %s\n", (int) mixerIndex, snd_strerror(err));
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return FALSE;
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}
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err = snd_ctl_card_info(handle, card_info);
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if (err < 0) {
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ERROR2("ERROR: snd_ctl_card_info, card=%d: %s\n", (int) mixerIndex, snd_strerror(err));
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}
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strncpy(description->name, snd_ctl_card_info_get_id(card_info), PORT_STRING_LENGTH - 1);
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sprintf(buffer, " [%s]", devname);
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strncat(description->name, buffer, PORT_STRING_LENGTH - 1 - strlen(description->name));
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strncpy(description->vendor, "ALSA (http://www.alsa-project.org)", PORT_STRING_LENGTH - 1);
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strncpy(description->description, snd_ctl_card_info_get_name(card_info), PORT_STRING_LENGTH - 1);
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strncat(description->description, ", ", PORT_STRING_LENGTH - 1 - strlen(description->description));
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strncat(description->description, snd_ctl_card_info_get_mixername(card_info), PORT_STRING_LENGTH - 1 - strlen(description->description));
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getALSAVersion(description->version, PORT_STRING_LENGTH - 1);
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snd_ctl_close(handle);
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snd_ctl_card_info_free(card_info);
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TRACE0("< PORT_GetPortMixerDescription\n");
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return TRUE;
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}
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void* PORT_Open(INT32 mixerIndex) {
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char devname[16];
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snd_mixer_t* mixer_handle;
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int err;
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PortMixer* handle;
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TRACE0("> PORT_Open\n");
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sprintf(devname, ALSA_HARDWARE_CARD, (int) mixerIndex);
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if ((err = snd_mixer_open(&mixer_handle, 0)) < 0) {
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ERROR2("Mixer %s open error: %s", devname, snd_strerror(err));
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return NULL;
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}
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if ((err = snd_mixer_attach(mixer_handle, devname)) < 0) {
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ERROR2("Mixer attach %s error: %s", devname, snd_strerror(err));
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snd_mixer_close(mixer_handle);
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return NULL;
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}
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if ((err = snd_mixer_selem_register(mixer_handle, NULL, NULL)) < 0) {
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ERROR1("Mixer register error: %s", snd_strerror(err));
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snd_mixer_close(mixer_handle);
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return NULL;
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}
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err = snd_mixer_load(mixer_handle);
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if (err < 0) {
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ERROR2("Mixer %s load error: %s", devname, snd_strerror(err));
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snd_mixer_close(mixer_handle);
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return NULL;
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}
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handle = (PortMixer*) calloc(1, sizeof(PortMixer));
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if (handle == NULL) {
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ERROR0("malloc() failed.");
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snd_mixer_close(mixer_handle);
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return NULL;
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}
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handle->numElems = 0;
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handle->elems = (snd_mixer_elem_t**) calloc(MAX_ELEMS, sizeof(snd_mixer_elem_t*));
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if (handle->elems == NULL) {
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ERROR0("malloc() failed.");
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snd_mixer_close(mixer_handle);
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free(handle);
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return NULL;
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}
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handle->types = (INT32*) calloc(MAX_ELEMS, sizeof(INT32));
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if (handle->types == NULL) {
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ERROR0("malloc() failed.");
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snd_mixer_close(mixer_handle);
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free(handle->elems);
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free(handle);
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return NULL;
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}
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handle->controls = (PortControl*) calloc(MAX_CONTROLS, sizeof(PortControl));
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if (handle->controls == NULL) {
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ERROR0("malloc() failed.");
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snd_mixer_close(mixer_handle);
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free(handle->elems);
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free(handle->types);
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free(handle);
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return NULL;
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}
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handle->mixer_handle = mixer_handle;
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// necessary to initialize data structures
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PORT_GetPortCount(handle);
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TRACE0("< PORT_Open\n");
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return handle;
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}
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void PORT_Close(void* id) {
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TRACE0("> PORT_Close\n");
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if (id != NULL) {
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PortMixer* handle = (PortMixer*) id;
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if (handle->mixer_handle != NULL) {
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snd_mixer_close(handle->mixer_handle);
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}
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if (handle->elems != NULL) {
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free(handle->elems);
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}
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if (handle->types != NULL) {
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free(handle->types);
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}
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if (handle->controls != NULL) {
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free(handle->controls);
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}
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free(handle);
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}
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TRACE0("< PORT_Close\n");
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}
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INT32 PORT_GetPortCount(void* id) {
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PortMixer* portMixer;
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snd_mixer_elem_t *elem;
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TRACE0("> PORT_GetPortCount\n");
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if (id == NULL) {
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// $$mp: Should become a descriptive error code (invalid handle).
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return -1;
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}
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portMixer = (PortMixer*) id;
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if (portMixer->numElems == 0) {
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for (elem = snd_mixer_first_elem(portMixer->mixer_handle); elem; elem = snd_mixer_elem_next(elem)) {
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if (!snd_mixer_selem_is_active(elem))
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continue;
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TRACE2("Simple mixer control '%s',%i\n",
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snd_mixer_selem_get_name(elem),
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snd_mixer_selem_get_index(elem));
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if (snd_mixer_selem_has_playback_volume(elem)) {
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portMixer->elems[portMixer->numElems] = elem;
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portMixer->types[portMixer->numElems] = PORT_DST_UNKNOWN;
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portMixer->numElems++;
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}
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// to prevent buffer overflow
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if (portMixer->numElems >= MAX_ELEMS) {
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break;
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}
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/* If an element has both playback an capture volume, it is put into the arrays
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twice. */
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if (snd_mixer_selem_has_capture_volume(elem)) {
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portMixer->elems[portMixer->numElems] = elem;
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portMixer->types[portMixer->numElems] = PORT_SRC_UNKNOWN;
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portMixer->numElems++;
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}
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// to prevent buffer overflow
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if (portMixer->numElems >= MAX_ELEMS) {
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break;
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}
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}
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}
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TRACE0("< PORT_GetPortCount\n");
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return portMixer->numElems;
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}
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INT32 PORT_GetPortType(void* id, INT32 portIndex) {
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PortMixer* portMixer;
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INT32 type;
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TRACE0("> PORT_GetPortType\n");
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if (id == NULL) {
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// $$mp: Should become a descriptive error code (invalid handle).
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return -1;
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}
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portMixer = (PortMixer*) id;
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if (portIndex < 0 || portIndex >= portMixer->numElems) {
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// $$mp: Should become a descriptive error code (index out of bounds).
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return -1;
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}
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type = portMixer->types[portIndex];
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TRACE0("< PORT_GetPortType\n");
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return type;
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}
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INT32 PORT_GetPortName(void* id, INT32 portIndex, char* name, INT32 len) {
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PortMixer* portMixer;
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const char* nam;
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TRACE0("> PORT_GetPortName\n");
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if (id == NULL) {
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// $$mp: Should become a descriptive error code (invalid handle).
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return -1;
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}
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portMixer = (PortMixer*) id;
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if (portIndex < 0 || portIndex >= portMixer->numElems) {
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// $$mp: Should become a descriptive error code (index out of bounds).
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return -1;
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}
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nam = snd_mixer_selem_get_name(portMixer->elems[portIndex]);
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strncpy(name, nam, len - 1);
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name[len - 1] = 0;
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TRACE0("< PORT_GetPortName\n");
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return TRUE;
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}
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static int isPlaybackFunction(INT32 portType) {
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return (portType & PORT_DST_MASK);
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}
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/* Sets portControl to a pointer to the next free array element in the PortControl (pointer)
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array of the passed portMixer. Returns TRUE if successful. May return FALSE if there is no
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free slot. In this case, portControl is not altered */
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static int getControlSlot(PortMixer* portMixer, PortControl** portControl) {
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if (portMixer->numControls >= MAX_CONTROLS) {
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return FALSE;
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} else {
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*portControl = &(portMixer->controls[portMixer->numControls]);
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portMixer->numControls++;
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return TRUE;
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}
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}
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/* Protect against illegal min-max values, preventing divisions by zero.
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*/
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inline static long getRange(long min, long max) {
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if (max > min) {
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return max - min;
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} else {
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return 1;
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}
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}
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/* Idea: we may specify that if unit is an empty string, the values are linear and if unit is "dB",
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the values are logarithmic.
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*/
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static void* createVolumeControl(PortControlCreator* creator,
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PortControl* portControl,
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snd_mixer_elem_t* elem, int isPlayback) {
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void* control;
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float precision;
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long min, max;
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if (isPlayback) {
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snd_mixer_selem_get_playback_volume_range(elem, &min, &max);
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} else {
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snd_mixer_selem_get_capture_volume_range(elem, &min, &max);
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}
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/* $$mp: The volume values retrieved with the ALSA API are strongly supposed to be logarithmic.
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So the following calculation is wrong. However, there is no correct calculation, since
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for equal-distant logarithmic steps, the precision expressed in linear varies over the
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scale. */
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precision = 1.0F / getRange(min, max);
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control = (creator->newFloatControl)(creator, portControl, CONTROL_TYPE_VOLUME, 0.0F, +1.0F, precision, "");
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return control;
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}
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void PORT_GetControls(void* id, INT32 portIndex, PortControlCreator* creator) {
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PortMixer* portMixer;
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snd_mixer_elem_t* elem;
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void* control;
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PortControl* portControl;
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void* controls[10];
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int numControls;
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char* portName;
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int isPlayback = 0;
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384 |
int isMono;
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int isStereo;
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char* type;
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snd_mixer_selem_channel_id_t channel;
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TRACE0("> PORT_GetControls\n");
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390 |
if (id == NULL) {
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ERROR0("Invalid handle!");
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392 |
// $$mp: an error code should be returned.
|
|
393 |
return;
|
|
394 |
}
|
|
395 |
portMixer = (PortMixer*) id;
|
|
396 |
if (portIndex < 0 || portIndex >= portMixer->numElems) {
|
|
397 |
ERROR0("Port index out of range!");
|
|
398 |
// $$mp: an error code should be returned.
|
|
399 |
return;
|
|
400 |
}
|
|
401 |
numControls = 0;
|
|
402 |
elem = portMixer->elems[portIndex];
|
|
403 |
if (snd_mixer_selem_has_playback_volume(elem) || snd_mixer_selem_has_capture_volume(elem)) {
|
21278
|
404 |
/* Since we've split/duplicated elements with both playback and capture on the recovery
|
12047
|
405 |
of elements, we now can assume that we handle only to deal with either playback or
|
|
406 |
capture. */
|
|
407 |
isPlayback = isPlaybackFunction(portMixer->types[portIndex]);
|
|
408 |
isMono = (isPlayback && snd_mixer_selem_is_playback_mono(elem)) ||
|
|
409 |
(!isPlayback && snd_mixer_selem_is_capture_mono(elem));
|
|
410 |
isStereo = (isPlayback &&
|
|
411 |
snd_mixer_selem_has_playback_channel(elem, SND_MIXER_SCHN_FRONT_LEFT) &&
|
|
412 |
snd_mixer_selem_has_playback_channel(elem, SND_MIXER_SCHN_FRONT_RIGHT)) ||
|
|
413 |
(!isPlayback &&
|
|
414 |
snd_mixer_selem_has_capture_channel(elem, SND_MIXER_SCHN_FRONT_LEFT) &&
|
|
415 |
snd_mixer_selem_has_capture_channel(elem, SND_MIXER_SCHN_FRONT_RIGHT));
|
|
416 |
// single volume control
|
|
417 |
if (isMono || isStereo) {
|
|
418 |
if (getControlSlot(portMixer, &portControl)) {
|
|
419 |
portControl->elem = elem;
|
|
420 |
portControl->portType = portMixer->types[portIndex];
|
|
421 |
portControl->controlType = CONTROL_TYPE_VOLUME;
|
|
422 |
if (isMono) {
|
|
423 |
portControl->channel = CHANNELS_MONO;
|
|
424 |
} else {
|
|
425 |
portControl->channel = CHANNELS_STEREO;
|
|
426 |
}
|
|
427 |
control = createVolumeControl(creator, portControl, elem, isPlayback);
|
|
428 |
if (control != NULL) {
|
|
429 |
controls[numControls++] = control;
|
|
430 |
}
|
|
431 |
}
|
|
432 |
} else { // more than two channels, each channels has its own control.
|
|
433 |
for (channel = SND_MIXER_SCHN_FRONT_LEFT; channel <= SND_MIXER_SCHN_LAST; channel++) {
|
|
434 |
if (isPlayback && snd_mixer_selem_has_playback_channel(elem, channel) ||
|
|
435 |
!isPlayback && snd_mixer_selem_has_capture_channel(elem, channel)) {
|
|
436 |
if (getControlSlot(portMixer, &portControl)) {
|
|
437 |
portControl->elem = elem;
|
|
438 |
portControl->portType = portMixer->types[portIndex];
|
|
439 |
portControl->controlType = CONTROL_TYPE_VOLUME;
|
|
440 |
portControl->channel = channel;
|
|
441 |
control = createVolumeControl(creator, portControl, elem, isPlayback);
|
|
442 |
// We wrap in a compound control to provide the channel name.
|
|
443 |
if (control != NULL) {
|
|
444 |
/* $$mp 2003-09-14: The following cast shouln't be necessary. Instead, the
|
|
445 |
declaration of PORT_NewCompoundControlPtr in Ports.h should be changed
|
|
446 |
to take a const char* parameter. */
|
|
447 |
control = (creator->newCompoundControl)(creator, (char*) snd_mixer_selem_channel_name(channel), &control, 1);
|
|
448 |
}
|
|
449 |
if (control != NULL) {
|
|
450 |
controls[numControls++] = control;
|
|
451 |
}
|
|
452 |
}
|
|
453 |
}
|
|
454 |
}
|
|
455 |
}
|
|
456 |
// BALANCE control
|
|
457 |
if (isStereo) {
|
|
458 |
if (getControlSlot(portMixer, &portControl)) {
|
|
459 |
portControl->elem = elem;
|
|
460 |
portControl->portType = portMixer->types[portIndex];
|
|
461 |
portControl->controlType = CONTROL_TYPE_BALANCE;
|
|
462 |
portControl->channel = CHANNELS_STEREO;
|
|
463 |
/* $$mp: The value for precision is chosen more or less arbitrarily. */
|
|
464 |
control = (creator->newFloatControl)(creator, portControl, CONTROL_TYPE_BALANCE, -1.0F, 1.0F, 0.01F, "");
|
|
465 |
if (control != NULL) {
|
|
466 |
controls[numControls++] = control;
|
|
467 |
}
|
|
468 |
}
|
|
469 |
}
|
|
470 |
}
|
|
471 |
if (snd_mixer_selem_has_playback_switch(elem) || snd_mixer_selem_has_capture_switch(elem)) {
|
|
472 |
if (getControlSlot(portMixer, &portControl)) {
|
|
473 |
type = isPlayback ? CONTROL_TYPE_MUTE : CONTROL_TYPE_SELECT;
|
|
474 |
portControl->elem = elem;
|
|
475 |
portControl->portType = portMixer->types[portIndex];
|
|
476 |
portControl->controlType = type;
|
|
477 |
control = (creator->newBooleanControl)(creator, portControl, type);
|
|
478 |
if (control != NULL) {
|
|
479 |
controls[numControls++] = control;
|
|
480 |
}
|
|
481 |
}
|
|
482 |
}
|
|
483 |
/* $$mp 2003-09-14: The following cast shouln't be necessary. Instead, the
|
|
484 |
declaration of PORT_NewCompoundControlPtr in Ports.h should be changed
|
|
485 |
to take a const char* parameter. */
|
|
486 |
portName = (char*) snd_mixer_selem_get_name(elem);
|
|
487 |
control = (creator->newCompoundControl)(creator, portName, controls, numControls);
|
|
488 |
if (control != NULL) {
|
|
489 |
(creator->addControl)(creator, control);
|
|
490 |
}
|
|
491 |
TRACE0("< PORT_GetControls\n");
|
|
492 |
}
|
|
493 |
|
|
494 |
|
|
495 |
INT32 PORT_GetIntValue(void* controlIDV) {
|
|
496 |
PortControl* portControl = (PortControl*) controlIDV;
|
|
497 |
int value = 0;
|
|
498 |
snd_mixer_selem_channel_id_t channel;
|
|
499 |
|
|
500 |
if (portControl != NULL) {
|
|
501 |
switch (portControl->channel) {
|
|
502 |
case CHANNELS_MONO:
|
|
503 |
channel = SND_MIXER_SCHN_MONO;
|
|
504 |
break;
|
|
505 |
|
|
506 |
case CHANNELS_STEREO:
|
|
507 |
channel = SND_MIXER_SCHN_FRONT_LEFT;
|
|
508 |
break;
|
|
509 |
|
|
510 |
default:
|
|
511 |
channel = portControl->channel;
|
|
512 |
}
|
|
513 |
if (portControl->controlType == CONTROL_TYPE_MUTE ||
|
|
514 |
portControl->controlType == CONTROL_TYPE_SELECT) {
|
|
515 |
if (isPlaybackFunction(portControl->portType)) {
|
|
516 |
snd_mixer_selem_get_playback_switch(portControl->elem, channel, &value);
|
|
517 |
} else {
|
|
518 |
snd_mixer_selem_get_capture_switch(portControl->elem, channel, &value);
|
|
519 |
}
|
|
520 |
if (portControl->controlType == CONTROL_TYPE_MUTE) {
|
|
521 |
value = ! value;
|
|
522 |
}
|
|
523 |
} else {
|
|
524 |
ERROR1("PORT_GetIntValue(): inappropriate control type: %s\n",
|
|
525 |
portControl->controlType);
|
|
526 |
}
|
|
527 |
}
|
|
528 |
return (INT32) value;
|
|
529 |
}
|
|
530 |
|
|
531 |
|
|
532 |
void PORT_SetIntValue(void* controlIDV, INT32 value) {
|
|
533 |
PortControl* portControl = (PortControl*) controlIDV;
|
|
534 |
snd_mixer_selem_channel_id_t channel;
|
|
535 |
|
|
536 |
if (portControl != NULL) {
|
|
537 |
if (portControl->controlType == CONTROL_TYPE_MUTE) {
|
|
538 |
value = ! value;
|
|
539 |
}
|
|
540 |
if (portControl->controlType == CONTROL_TYPE_MUTE ||
|
|
541 |
portControl->controlType == CONTROL_TYPE_SELECT) {
|
|
542 |
if (isPlaybackFunction(portControl->portType)) {
|
|
543 |
snd_mixer_selem_set_playback_switch_all(portControl->elem, value);
|
|
544 |
} else {
|
|
545 |
snd_mixer_selem_set_capture_switch_all(portControl->elem, value);
|
|
546 |
}
|
|
547 |
} else {
|
|
548 |
ERROR1("PORT_SetIntValue(): inappropriate control type: %s\n",
|
|
549 |
portControl->controlType);
|
|
550 |
}
|
|
551 |
}
|
|
552 |
}
|
|
553 |
|
|
554 |
|
|
555 |
static float scaleVolumeValueToNormalized(long value, long min, long max) {
|
|
556 |
return (float) (value - min) / getRange(min, max);
|
|
557 |
}
|
|
558 |
|
|
559 |
|
|
560 |
static long scaleVolumeValueToHardware(float value, long min, long max) {
|
|
561 |
return (long)(value * getRange(min, max) + min);
|
|
562 |
}
|
|
563 |
|
|
564 |
|
|
565 |
float getRealVolume(PortControl* portControl,
|
|
566 |
snd_mixer_selem_channel_id_t channel) {
|
|
567 |
float fValue;
|
|
568 |
long lValue = 0;
|
|
569 |
long min = 0;
|
|
570 |
long max = 0;
|
|
571 |
|
|
572 |
if (isPlaybackFunction(portControl->portType)) {
|
|
573 |
snd_mixer_selem_get_playback_volume_range(portControl->elem,
|
|
574 |
&min, &max);
|
|
575 |
snd_mixer_selem_get_playback_volume(portControl->elem,
|
|
576 |
channel, &lValue);
|
|
577 |
} else {
|
|
578 |
snd_mixer_selem_get_capture_volume_range(portControl->elem,
|
|
579 |
&min, &max);
|
|
580 |
snd_mixer_selem_get_capture_volume(portControl->elem,
|
|
581 |
channel, &lValue);
|
|
582 |
}
|
|
583 |
fValue = scaleVolumeValueToNormalized(lValue, min, max);
|
|
584 |
return fValue;
|
|
585 |
}
|
|
586 |
|
|
587 |
|
|
588 |
void setRealVolume(PortControl* portControl,
|
|
589 |
snd_mixer_selem_channel_id_t channel, float value) {
|
|
590 |
long lValue = 0;
|
|
591 |
long min = 0;
|
|
592 |
long max = 0;
|
|
593 |
|
|
594 |
if (isPlaybackFunction(portControl->portType)) {
|
|
595 |
snd_mixer_selem_get_playback_volume_range(portControl->elem,
|
|
596 |
&min, &max);
|
|
597 |
lValue = scaleVolumeValueToHardware(value, min, max);
|
|
598 |
snd_mixer_selem_set_playback_volume(portControl->elem,
|
|
599 |
channel, lValue);
|
|
600 |
} else {
|
|
601 |
snd_mixer_selem_get_capture_volume_range(portControl->elem,
|
|
602 |
&min, &max);
|
|
603 |
lValue = scaleVolumeValueToHardware(value, min, max);
|
|
604 |
snd_mixer_selem_set_capture_volume(portControl->elem,
|
|
605 |
channel, lValue);
|
|
606 |
}
|
|
607 |
}
|
|
608 |
|
|
609 |
|
|
610 |
static float getFakeBalance(PortControl* portControl) {
|
|
611 |
float volL, volR;
|
|
612 |
|
|
613 |
// pan is the ratio of left and right
|
|
614 |
volL = getRealVolume(portControl, SND_MIXER_SCHN_FRONT_LEFT);
|
|
615 |
volR = getRealVolume(portControl, SND_MIXER_SCHN_FRONT_RIGHT);
|
|
616 |
if (volL > volR) {
|
|
617 |
return -1.0f + (volR / volL);
|
|
618 |
}
|
|
619 |
else if (volR > volL) {
|
|
620 |
return 1.0f - (volL / volR);
|
|
621 |
}
|
|
622 |
return 0.0f;
|
|
623 |
}
|
|
624 |
|
|
625 |
|
|
626 |
static float getFakeVolume(PortControl* portControl) {
|
|
627 |
float valueL;
|
|
628 |
float valueR;
|
|
629 |
float value;
|
|
630 |
|
|
631 |
valueL = getRealVolume(portControl, SND_MIXER_SCHN_FRONT_LEFT);
|
|
632 |
valueR = getRealVolume(portControl, SND_MIXER_SCHN_FRONT_RIGHT);
|
|
633 |
// volume is the greater value of both
|
|
634 |
value = valueL > valueR ? valueL : valueR ;
|
|
635 |
return value;
|
|
636 |
}
|
|
637 |
|
|
638 |
|
|
639 |
/*
|
|
640 |
* sets the unsigned values for left and right volume according to
|
|
641 |
* the given volume (0...1) and balance (-1..0..+1)
|
|
642 |
*/
|
|
643 |
static void setFakeVolume(PortControl* portControl, float vol, float bal) {
|
|
644 |
float volumeLeft;
|
|
645 |
float volumeRight;
|
|
646 |
|
|
647 |
if (bal < 0.0f) {
|
|
648 |
volumeLeft = vol;
|
|
649 |
volumeRight = vol * (bal + 1.0f);
|
|
650 |
} else {
|
|
651 |
volumeLeft = vol * (1.0f - bal);
|
|
652 |
volumeRight = vol;
|
|
653 |
}
|
|
654 |
setRealVolume(portControl, SND_MIXER_SCHN_FRONT_LEFT, volumeLeft);
|
|
655 |
setRealVolume(portControl, SND_MIXER_SCHN_FRONT_RIGHT, volumeRight);
|
|
656 |
}
|
|
657 |
|
|
658 |
|
|
659 |
float PORT_GetFloatValue(void* controlIDV) {
|
|
660 |
PortControl* portControl = (PortControl*) controlIDV;
|
|
661 |
float value = 0.0F;
|
|
662 |
|
|
663 |
if (portControl != NULL) {
|
|
664 |
if (portControl->controlType == CONTROL_TYPE_VOLUME) {
|
|
665 |
switch (portControl->channel) {
|
|
666 |
case CHANNELS_MONO:
|
|
667 |
value = getRealVolume(portControl, SND_MIXER_SCHN_MONO);
|
|
668 |
break;
|
|
669 |
|
|
670 |
case CHANNELS_STEREO:
|
|
671 |
value = getFakeVolume(portControl);
|
|
672 |
break;
|
|
673 |
|
|
674 |
default:
|
|
675 |
value = getRealVolume(portControl, portControl->channel);
|
|
676 |
}
|
|
677 |
} else if (portControl->controlType == CONTROL_TYPE_BALANCE) {
|
|
678 |
if (portControl->channel == CHANNELS_STEREO) {
|
|
679 |
value = getFakeBalance(portControl);
|
|
680 |
} else {
|
|
681 |
ERROR0("PORT_GetFloatValue(): Balance only allowed for stereo channels!\n");
|
|
682 |
}
|
|
683 |
} else {
|
|
684 |
ERROR1("PORT_GetFloatValue(): inappropriate control type: %s!\n",
|
|
685 |
portControl->controlType);
|
|
686 |
}
|
|
687 |
}
|
|
688 |
return value;
|
|
689 |
}
|
|
690 |
|
|
691 |
|
|
692 |
void PORT_SetFloatValue(void* controlIDV, float value) {
|
|
693 |
PortControl* portControl = (PortControl*) controlIDV;
|
|
694 |
|
|
695 |
if (portControl != NULL) {
|
|
696 |
if (portControl->controlType == CONTROL_TYPE_VOLUME) {
|
|
697 |
switch (portControl->channel) {
|
|
698 |
case CHANNELS_MONO:
|
|
699 |
setRealVolume(portControl, SND_MIXER_SCHN_MONO, value);
|
|
700 |
break;
|
|
701 |
|
|
702 |
case CHANNELS_STEREO:
|
|
703 |
setFakeVolume(portControl, value, getFakeBalance(portControl));
|
|
704 |
break;
|
|
705 |
|
|
706 |
default:
|
|
707 |
setRealVolume(portControl, portControl->channel, value);
|
|
708 |
}
|
|
709 |
} else if (portControl->controlType == CONTROL_TYPE_BALANCE) {
|
|
710 |
if (portControl->channel == CHANNELS_STEREO) {
|
|
711 |
setFakeVolume(portControl, getFakeVolume(portControl), value);
|
|
712 |
} else {
|
|
713 |
ERROR0("PORT_SetFloatValue(): Balance only allowed for stereo channels!\n");
|
|
714 |
}
|
|
715 |
} else {
|
|
716 |
ERROR1("PORT_SetFloatValue(): inappropriate control type: %s!\n",
|
|
717 |
portControl->controlType);
|
|
718 |
}
|
|
719 |
}
|
|
720 |
}
|
|
721 |
|
|
722 |
|
|
723 |
#endif // USE_PORTS
|