| /* |
| * A simple PCM loopback utility |
| * Copyright (c) 2010 by Jaroslav Kysela <perex@perex.cz> |
| * |
| * Author: Jaroslav Kysela <perex@perex.cz> |
| * |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program 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 for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| * |
| */ |
| |
| #include <ctype.h> |
| #include <syslog.h> |
| #include <alsa/asoundlib.h> |
| #include "alsaloop.h" |
| |
| static char *id_str(snd_ctl_elem_id_t *id) |
| { |
| static char str[128]; |
| |
| sprintf(str, "%i,%s,%i,%i,%s,%i", |
| snd_ctl_elem_id_get_numid(id), |
| snd_ctl_elem_iface_name(snd_ctl_elem_id_get_interface(id)), |
| snd_ctl_elem_id_get_device(id), |
| snd_ctl_elem_id_get_subdevice(id), |
| snd_ctl_elem_id_get_name(id), |
| snd_ctl_elem_id_get_index(id)); |
| return str; |
| } |
| |
| int control_parse_id(const char *str, snd_ctl_elem_id_t *id) |
| { |
| int c, size, numid; |
| char *ptr; |
| |
| while (*str == ' ' || *str == '\t') |
| str++; |
| if (!(*str)) |
| return -EINVAL; |
| snd_ctl_elem_id_set_interface(id, SND_CTL_ELEM_IFACE_MIXER); /* default */ |
| while (*str) { |
| if (!strncasecmp(str, "numid=", 6)) { |
| str += 6; |
| numid = atoi(str); |
| if (numid <= 0) { |
| logit(LOG_CRIT, "Invalid numid %d\n", numid); |
| return -EINVAL; |
| } |
| snd_ctl_elem_id_set_numid(id, atoi(str)); |
| while (isdigit(*str)) |
| str++; |
| } else if (!strncasecmp(str, "iface=", 6)) { |
| str += 6; |
| if (!strncasecmp(str, "card", 4)) { |
| snd_ctl_elem_id_set_interface(id, SND_CTL_ELEM_IFACE_CARD); |
| str += 4; |
| } else if (!strncasecmp(str, "mixer", 5)) { |
| snd_ctl_elem_id_set_interface(id, SND_CTL_ELEM_IFACE_MIXER); |
| str += 5; |
| } else if (!strncasecmp(str, "pcm", 3)) { |
| snd_ctl_elem_id_set_interface(id, SND_CTL_ELEM_IFACE_PCM); |
| str += 3; |
| } else if (!strncasecmp(str, "rawmidi", 7)) { |
| snd_ctl_elem_id_set_interface(id, SND_CTL_ELEM_IFACE_RAWMIDI); |
| str += 7; |
| } else if (!strncasecmp(str, "timer", 5)) { |
| snd_ctl_elem_id_set_interface(id, SND_CTL_ELEM_IFACE_TIMER); |
| str += 5; |
| } else if (!strncasecmp(str, "sequencer", 9)) { |
| snd_ctl_elem_id_set_interface(id, SND_CTL_ELEM_IFACE_SEQUENCER); |
| str += 9; |
| } else { |
| return -EINVAL; |
| } |
| } else if (!strncasecmp(str, "name=", 5)) { |
| char buf[64]; |
| str += 5; |
| ptr = buf; |
| size = 0; |
| if (*str == '\'' || *str == '\"') { |
| c = *str++; |
| while (*str && *str != c) { |
| if (size < (int)sizeof(buf)) { |
| *ptr++ = *str; |
| size++; |
| } |
| str++; |
| } |
| if (*str == c) |
| str++; |
| } else { |
| while (*str && *str != ',') { |
| if (size < (int)sizeof(buf)) { |
| *ptr++ = *str; |
| size++; |
| } |
| str++; |
| } |
| } |
| *ptr = '\0'; |
| snd_ctl_elem_id_set_name(id, buf); |
| } else if (!strncasecmp(str, "index=", 6)) { |
| str += 6; |
| snd_ctl_elem_id_set_index(id, atoi(str)); |
| while (isdigit(*str)) |
| str++; |
| } else if (!strncasecmp(str, "device=", 7)) { |
| str += 7; |
| snd_ctl_elem_id_set_device(id, atoi(str)); |
| while (isdigit(*str)) |
| str++; |
| } else if (!strncasecmp(str, "subdevice=", 10)) { |
| str += 10; |
| snd_ctl_elem_id_set_subdevice(id, atoi(str)); |
| while (isdigit(*str)) |
| str++; |
| } |
| if (*str == ',') { |
| str++; |
| } else { |
| if (*str) |
| return -EINVAL; |
| } |
| } |
| return 0; |
| } |
| |
| int control_id_match(snd_ctl_elem_id_t *id1, snd_ctl_elem_id_t *id2) |
| { |
| if (snd_ctl_elem_id_get_interface(id1) != |
| snd_ctl_elem_id_get_interface(id2)) |
| return 0; |
| if (snd_ctl_elem_id_get_device(id1) != |
| snd_ctl_elem_id_get_device(id2)) |
| return 0; |
| if (snd_ctl_elem_id_get_subdevice(id1) != |
| snd_ctl_elem_id_get_subdevice(id2)) |
| return 0; |
| if (strcmp(snd_ctl_elem_id_get_name(id1), |
| snd_ctl_elem_id_get_name(id2)) != 0) |
| return 0; |
| if (snd_ctl_elem_id_get_index(id1) != |
| snd_ctl_elem_id_get_index(id2)) |
| return 0; |
| return 1; |
| } |
| |
| static int control_init1(struct loopback_handle *lhandle, |
| struct loopback_control *ctl) |
| { |
| int err; |
| |
| snd_ctl_elem_info_set_id(ctl->info, ctl->id); |
| snd_ctl_elem_value_set_id(ctl->value, ctl->id); |
| if (lhandle->ctl == NULL) { |
| logit(LOG_WARNING, "Unable to read control info for '%s'\n", id_str(ctl->id)); |
| return -EIO; |
| } |
| err = snd_ctl_elem_info(lhandle->ctl, ctl->info); |
| if (err < 0) { |
| logit(LOG_WARNING, "Unable to read control info '%s': %s\n", id_str(ctl->id), snd_strerror(err)); |
| return err; |
| } |
| err = snd_ctl_elem_read(lhandle->ctl, ctl->value); |
| if (err < 0) { |
| logit(LOG_WARNING, "Unable to read control value (init1) '%s': %s\n", id_str(ctl->id), snd_strerror(err)); |
| return err; |
| } |
| return 0; |
| } |
| |
| static int copy_value(struct loopback_control *dst, |
| struct loopback_control *src) |
| { |
| snd_ctl_elem_type_t type; |
| unsigned int count; |
| int i; |
| |
| type = snd_ctl_elem_info_get_type(dst->info); |
| count = snd_ctl_elem_info_get_count(dst->info); |
| switch (type) { |
| case SND_CTL_ELEM_TYPE_BOOLEAN: |
| for (i = 0; i < count; i++) |
| snd_ctl_elem_value_set_boolean(dst->value, |
| i, snd_ctl_elem_value_get_boolean(src->value, i)); |
| break; |
| case SND_CTL_ELEM_TYPE_INTEGER: |
| for (i = 0; i < count; i++) { |
| snd_ctl_elem_value_set_integer(dst->value, |
| i, snd_ctl_elem_value_get_integer(src->value, i)); |
| } |
| break; |
| default: |
| logit(LOG_CRIT, "Unable to copy control value for type %s\n", snd_ctl_elem_type_name(type)); |
| return -EINVAL; |
| } |
| return 0; |
| } |
| |
| static int oss_set(struct loopback *loop, |
| struct loopback_ossmixer *ossmix, |
| int enable) |
| { |
| char buf[128], file[128]; |
| int fd; |
| |
| if (loop->capt->card_number < 0) |
| return 0; |
| if (!enable) { |
| sprintf(buf, "%s \"\" 0\n", ossmix->oss_id); |
| } else { |
| sprintf(buf, "%s \"%s\" %i\n", ossmix->oss_id, ossmix->alsa_id, ossmix->alsa_index); |
| } |
| sprintf(file, "/proc/asound/card%i/oss_mixer", loop->capt->card_number); |
| if (verbose) |
| snd_output_printf(loop->output, "%s: Initialize OSS volume %s: %s", loop->id, file, buf); |
| fd = open(file, O_WRONLY); |
| if (fd >= 0 && write(fd, buf, strlen(buf)) == strlen(buf)) { |
| close(fd); |
| return 0; |
| } |
| if (fd >= 0) |
| close(fd); |
| logit(LOG_INFO, "%s: Unable to initialize OSS Mixer ID '%s'\n", loop->id, ossmix->oss_id); |
| return -1; |
| } |
| |
| static int control_init2(struct loopback *loop, |
| struct loopback_mixer *mix) |
| { |
| snd_ctl_elem_type_t type; |
| unsigned int count; |
| int err; |
| |
| snd_ctl_elem_info_copy(mix->dst.info, mix->src.info); |
| snd_ctl_elem_info_set_id(mix->dst.info, mix->dst.id); |
| snd_ctl_elem_value_clear(mix->dst.value); |
| snd_ctl_elem_value_set_id(mix->dst.value, mix->dst.id); |
| type = snd_ctl_elem_info_get_type(mix->dst.info); |
| count = snd_ctl_elem_info_get_count(mix->dst.info); |
| snd_ctl_elem_remove(loop->capt->ctl, mix->dst.id); |
| switch (type) { |
| case SND_CTL_ELEM_TYPE_BOOLEAN: |
| err = snd_ctl_elem_add_boolean(loop->capt->ctl, |
| mix->dst.id, count); |
| copy_value(&mix->dst, &mix->src); |
| break; |
| case SND_CTL_ELEM_TYPE_INTEGER: |
| err = snd_ctl_elem_add_integer(loop->capt->ctl, |
| mix->dst.id, count, |
| snd_ctl_elem_info_get_min(mix->dst.info), |
| snd_ctl_elem_info_get_max(mix->dst.info), |
| snd_ctl_elem_info_get_step(mix->dst.info)); |
| copy_value(&mix->dst, &mix->src); |
| break; |
| default: |
| logit(LOG_CRIT, "Unable to handle control type %s\n", snd_ctl_elem_type_name(type)); |
| err = -EINVAL; |
| break; |
| } |
| if (err < 0) { |
| logit(LOG_CRIT, "Unable to create control '%s': %s\n", id_str(mix->dst.id), snd_strerror(err)); |
| return err; |
| } |
| err = snd_ctl_elem_unlock(loop->capt->ctl, mix->dst.id); |
| if (err < 0) { |
| logit(LOG_CRIT, "Unable to unlock control info '%s': %s\n", id_str(mix->dst.id), snd_strerror(err)); |
| return err; |
| } |
| err = snd_ctl_elem_info(loop->capt->ctl, mix->dst.info); |
| if (err < 0) { |
| logit(LOG_CRIT, "Unable to read control info '%s': %s\n", id_str(mix->dst.id), snd_strerror(err)); |
| return err; |
| } |
| if (snd_ctl_elem_info_is_tlv_writable(mix->dst.info)) { |
| unsigned int tlv[64]; |
| err = snd_ctl_elem_tlv_read(loop->play->ctl, |
| mix->src.id, |
| tlv, sizeof(tlv)); |
| if (err < 0) { |
| logit(LOG_CRIT, "Unable to read TLV for '%s': %s\n", id_str(mix->src.id), snd_strerror(err)); |
| tlv[0] = tlv[1] = 0; |
| } |
| err = snd_ctl_elem_tlv_write(loop->capt->ctl, |
| mix->dst.id, |
| tlv); |
| if (err < 0) { |
| logit(LOG_CRIT, "Unable to write TLV for '%s': %s\n", id_str(mix->src.id), snd_strerror(err)); |
| return err; |
| } |
| } |
| err = snd_ctl_elem_write(loop->capt->ctl, mix->dst.value); |
| if (err < 0) { |
| logit(LOG_CRIT, "Unable to write control value '%s': %s\n", id_str(mix->dst.id), snd_strerror(err)); |
| return err; |
| } |
| return 0; |
| } |
| |
| int control_init(struct loopback *loop) |
| { |
| struct loopback_mixer *mix; |
| struct loopback_ossmixer *ossmix; |
| int err; |
| |
| for (ossmix = loop->oss_controls; ossmix; ossmix = ossmix->next) |
| oss_set(loop, ossmix, 0); |
| for (mix = loop->controls; mix; mix = mix->next) { |
| err = control_init1(loop->play, &mix->src); |
| if (err < 0) { |
| logit(LOG_WARNING, "%s: Disabling playback control '%s'\n", loop->id, id_str(mix->src.id)); |
| mix->skip = 1; |
| continue; |
| } |
| err = control_init2(loop, mix); |
| if (err < 0) |
| return err; |
| } |
| for (ossmix = loop->oss_controls; ossmix; ossmix = ossmix->next) { |
| err = oss_set(loop, ossmix, 1); |
| if (err < 0) { |
| ossmix->skip = 1; |
| logit(LOG_WARNING, "%s: Disabling OSS mixer ID '%s'\n", loop->id, ossmix->oss_id); |
| } |
| } |
| return 0; |
| } |
| |
| int control_done(struct loopback *loop) |
| { |
| struct loopback_mixer *mix; |
| struct loopback_ossmixer *ossmix; |
| int err; |
| |
| if (loop->capt->ctl == NULL) |
| return 0; |
| for (ossmix = loop->oss_controls; ossmix; ossmix = ossmix->next) { |
| err = oss_set(loop, ossmix, 0); |
| if (err < 0) |
| logit(LOG_WARNING, "%s: Unable to remove OSS control '%s'\n", loop->id, ossmix->oss_id); |
| } |
| for (mix = loop->controls; mix; mix = mix->next) { |
| if (mix->skip) |
| continue; |
| err = snd_ctl_elem_remove(loop->capt->ctl, mix->dst.id); |
| if (err < 0) |
| logit(LOG_WARNING, "%s: Unable to remove control '%s': %s\n", loop->id, id_str(mix->dst.id), snd_strerror(err)); |
| } |
| return 0; |
| } |
| |
| static int control_event1(struct loopback *loop, |
| struct loopback_mixer *mix, |
| snd_ctl_event_t *ev, |
| int capture) |
| { |
| unsigned int mask = snd_ctl_event_elem_get_mask(ev); |
| int err; |
| |
| if (mask == SND_CTL_EVENT_MASK_REMOVE) |
| return 0; |
| if ((mask & SND_CTL_EVENT_MASK_VALUE) == 0) |
| return 0; |
| if (!capture) { |
| snd_ctl_elem_value_set_id(mix->src.value, mix->src.id); |
| err = snd_ctl_elem_read(loop->play->ctl, mix->src.value); |
| if (err < 0) { |
| logit(LOG_CRIT, "Unable to read control value (event1) '%s': %s\n", id_str(mix->src.id), snd_strerror(err)); |
| return err; |
| } |
| copy_value(&mix->dst, &mix->src); |
| err = snd_ctl_elem_write(loop->capt->ctl, mix->dst.value); |
| if (err < 0) { |
| logit(LOG_CRIT, "Unable to write control value (event1) '%s': %s\n", id_str(mix->dst.id), snd_strerror(err)); |
| return err; |
| } |
| } else { |
| err = snd_ctl_elem_read(loop->capt->ctl, mix->dst.value); |
| if (err < 0) { |
| logit(LOG_CRIT, "Unable to read control value (event2) '%s': %s\n", id_str(mix->dst.id), snd_strerror(err)); |
| return err; |
| } |
| copy_value(&mix->src, &mix->dst); |
| err = snd_ctl_elem_write(loop->play->ctl, mix->src.value); |
| if (err < 0) { |
| logit(LOG_CRIT, "Unable to write control value (event2) '%s': %s\n", id_str(mix->src.id), snd_strerror(err)); |
| return err; |
| } |
| } |
| return 0; |
| } |
| |
| int control_event(struct loopback_handle *lhandle, snd_ctl_event_t *ev) |
| { |
| snd_ctl_elem_id_t *id2; |
| struct loopback_mixer *mix; |
| int capt = lhandle == lhandle->loopback->capt; |
| int err; |
| |
| snd_ctl_elem_id_alloca(&id2); |
| snd_ctl_event_elem_get_id(ev, id2); |
| for (mix = lhandle->loopback->controls; mix; mix = mix->next) { |
| if (mix->skip) |
| continue; |
| if (control_id_match(id2, capt ? mix->dst.id : mix->src.id)) { |
| err = control_event1(lhandle->loopback, mix, ev, capt); |
| if (err < 0) |
| return err; |
| } |
| } |
| return 0; |
| } |