mirror of
https://github.com/alsa-project/alsa-utils
synced 2024-11-10 00:05:42 +01:00
alsactl - restore dB level
When alsactl saved state has dB level information and an attribute of a control element is changed after save (e.g. volume range is changed), try to restore the values to keep the same dB level. This change requires the new alsa-lib functions for TLV dB conversion, so we check it in configure (until AM_PATH_ALSA(1.0.16) works).
This commit is contained in:
Takashi Iwai
parent
030686a847
commit
c88c15a478
2 changed files with 247 additions and 36 deletions
279
alsactl/state.c
279
alsactl/state.c
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@ -188,6 +188,46 @@ static unsigned int *str_to_tlv(const char *s)
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return tlv;
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}
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/*
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* add the TLV string and dB ranges to comment fields
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*/
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static int add_tlv_comments(snd_ctl_t *handle, snd_ctl_elem_id_t *id,
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snd_ctl_elem_info_t *info, snd_config_t *comment)
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{
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unsigned int tlv[MAX_USER_TLV_SIZE];
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unsigned int *db;
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long dbmin, dbmax;
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int err;
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if (snd_ctl_elem_tlv_read(handle, id, tlv, sizeof(tlv)) < 0)
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return 0; /* ignore error */
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if (snd_ctl_elem_info_is_tlv_writable(info)) {
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char *s = tlv_to_str(tlv);
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if (s) {
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err = snd_config_string_add(comment, "tlv", s);
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if (err < 0) {
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error("snd_config_string_add: %s", snd_strerror(err));
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return err;
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}
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free(s);
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}
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}
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err = snd_tlv_parse_dB_info(tlv, sizeof(tlv), &db);
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if (err <= 0)
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return 0;
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snd_tlv_get_dB_range(db, snd_ctl_elem_info_get_min(info),
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snd_ctl_elem_info_get_max(info),
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&dbmin, &dbmax);
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if (err < 0)
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return err;
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snd_config_integer_add(comment, "dbmin", dbmin);
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snd_config_integer_add(comment, "dbmax", dbmax);
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return 0;
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}
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static int get_control(snd_ctl_t *handle, snd_ctl_elem_id_t *id, snd_config_t *top)
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{
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snd_ctl_elem_value_t *ctl;
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@ -285,8 +325,12 @@ static int get_control(snd_ctl_t *handle, snd_ctl_elem_id_t *id, snd_config_t *t
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error("snd_config_string_add: %s", snd_strerror(err));
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return err;
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}
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if (snd_ctl_elem_info_is_tlv_readable(info) &&
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snd_ctl_elem_info_is_tlv_writable(info)) {
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if (snd_ctl_elem_info_is_tlv_readable(info)) {
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err = add_tlv_comments(handle, id, info, comment);
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if (err < 0)
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return err;
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}
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if (snd_ctl_elem_info_is_tlv_readable(info)) {
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unsigned int tlv[MAX_USER_TLV_SIZE];
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err = snd_ctl_elem_tlv_read(handle, id, tlv, sizeof(tlv));
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if (err >= 0) {
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@ -765,6 +809,56 @@ static int is_user_control(snd_config_t *conf)
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return 0;
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}
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/*
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* get the item type from the given comment config
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*/
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static int get_comment_type(snd_config_t *n)
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{
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const char *type;
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if (snd_config_get_string(n, &type) < 0)
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return -EINVAL;
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if (strcmp(type, "BOOLEAN") == 0)
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return SND_CTL_ELEM_TYPE_BOOLEAN;
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else if (strcmp(type, "INTEGER") == 0)
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return SND_CTL_ELEM_TYPE_INTEGER;
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else if (strcmp(type, "ENUMERATED") == 0)
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return SND_CTL_ELEM_TYPE_ENUMERATED;
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else if (strcmp(type, "INTEGER64") == 0)
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return SND_CTL_ELEM_TYPE_INTEGER;
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else if (strcmp(type, "IEC958") == 0)
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return SND_CTL_ELEM_TYPE_IEC958;
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else
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return -EINVAL;
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}
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/*
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* get the value range from the given comment config
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*/
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static int get_comment_range(snd_config_t *n, int ctype,
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long *imin, long *imax, long *istep)
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{
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const char *s;
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int err;
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if (snd_config_get_string(n, &s) < 0)
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return -EINVAL;
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switch (ctype) {
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case SND_CTL_ELEM_TYPE_INTEGER:
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err = sscanf(s, "%li - %li (step %li)", imin, imax, istep);
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if (err != 3) {
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istep = 0;
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err = sscanf(s, "%li - %li", imin, imax);
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if (err != 2)
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return -EINVAL;
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}
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static int add_user_control(snd_ctl_t *handle, snd_ctl_elem_info_t *info, snd_config_t *conf)
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{
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snd_ctl_elem_id_t *id;
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@ -781,39 +875,20 @@ static int add_user_control(snd_ctl_t *handle, snd_ctl_elem_info_t *info, snd_co
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tlv = NULL;
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snd_config_for_each(i, next, conf) {
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snd_config_t *n = snd_config_iterator_entry(i);
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const char *id, *type;
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const char *id;
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if (snd_config_get_id(n, &id) < 0)
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continue;
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if (strcmp(id, "type") == 0) {
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if ((err = snd_config_get_string(n, &type)) < 0)
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return -EINVAL;
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if (strcmp(type, "BOOLEAN") == 0)
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ctype = SND_CTL_ELEM_TYPE_BOOLEAN;
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else if (strcmp(type, "INTEGER") == 0)
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ctype = SND_CTL_ELEM_TYPE_INTEGER;
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else if (strcmp(type, "IEC958") == 0)
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ctype = SND_CTL_ELEM_TYPE_IEC958;
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else
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return -EINVAL;
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err = get_comment_type(n);
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if (err < 0)
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return err;
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ctype = err;
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continue;
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}
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if (strcmp(id, "range") == 0) {
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const char *s;
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if ((err = snd_config_get_string(n, &s)) < 0)
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return -EINVAL;
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switch (ctype) {
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case SND_CTL_ELEM_TYPE_INTEGER:
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err = sscanf(s, "%li - %li (step %li)", &imin, &imax, &istep);
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if (err != 3) {
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istep = 0;
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err = sscanf(s, "%li - %li", &imin, &imax);
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if (err != 2)
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return -EINVAL;
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}
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break;
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default:
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return -EINVAL;
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}
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err = get_comment_range(n, ctype, &imin, &imax, &istep);
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if (err < 0)
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return err;
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continue;
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}
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if (strcmp(id, "count") == 0) {
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@ -867,6 +942,137 @@ static int add_user_control(snd_ctl_t *handle, snd_ctl_elem_info_t *info, snd_co
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return snd_ctl_elem_info(handle, info);
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}
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/*
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* look for a config node with the given item name
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*/
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static snd_config_t *search_comment_item(snd_config_t *conf, const char *name)
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{
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snd_config_iterator_t i, next;
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snd_config_for_each(i, next, conf) {
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snd_config_t *n = snd_config_iterator_entry(i);
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const char *id;
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if (snd_config_get_id(n, &id) < 0)
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continue;
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if (strcmp(id, name) == 0)
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return n;
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}
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return NULL;
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}
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/*
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* check whether the config item has the same of compatible type
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*/
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static int check_comment_type(snd_config_t *conf, int type)
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{
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snd_config_t *n = search_comment_item(conf, "type");
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int ctype;
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if (!n)
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return 0; /* not defined */
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ctype = get_comment_type(n);
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if (ctype == type)
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return 0;
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if ((ctype == SND_CTL_ELEM_TYPE_BOOLEAN ||
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ctype == SND_CTL_ELEM_TYPE_INTEGER ||
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ctype == SND_CTL_ELEM_TYPE_INTEGER64 ||
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ctype == SND_CTL_ELEM_TYPE_ENUMERATED) &&
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(type == SND_CTL_ELEM_TYPE_BOOLEAN ||
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type == SND_CTL_ELEM_TYPE_INTEGER ||
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type == SND_CTL_ELEM_TYPE_INTEGER64 ||
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type == SND_CTL_ELEM_TYPE_ENUMERATED))
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return 0; /* OK, compatible */
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return -EINVAL;
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}
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/*
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* convert from an old value to a new value with the same dB level
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*/
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static int convert_to_new_db(snd_config_t *value, long omin, long omax,
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long nmin, long nmax,
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long odbmin, long odbmax,
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long ndbmin, long ndbmax)
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{
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long val;
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if (config_integer(value, &val) < 0)
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return -EINVAL;
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if (val < omin || val > omax)
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return -EINVAL;
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val = ((val - omin) * (odbmax - odbmin)) / (omax - omin) + odbmin;
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if (val < ndbmin)
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val = ndbmin;
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else if (val > ndbmax)
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val = ndbmax;
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val = ((val - ndbmin) * (nmax - nmin)) / (ndbmax - ndbmin) + nmin;
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return snd_config_set_integer(value, val);
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}
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/*
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* compare the current value range with the old range in comments.
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* also, if dB information is available, try to compare them.
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* if any change occurs, try to keep the same dB level.
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*/
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static int check_comment_range(snd_ctl_t *handle, snd_config_t *conf,
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snd_ctl_elem_info_t *info, snd_config_t *value)
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{
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snd_config_t *n;
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long omin, omax, ostep;
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long nmin, nmax;
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long odbmin, odbmax;
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long ndbmin, ndbmax;
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snd_ctl_elem_id_t *id;
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n = search_comment_item(conf, "range");
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if (!n)
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return 0;
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if (get_comment_range(n, SND_CTL_ELEM_TYPE_INTEGER,
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&omin, &omax, &ostep) < 0)
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return 0;
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nmin = snd_ctl_elem_info_get_min(info);
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nmax = snd_ctl_elem_info_get_max(info);
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if (omin != nmin && omax != nmax) {
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/* Hey, the range mismatches */
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if (!force_restore)
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return -EINVAL;
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}
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if (omin >= omax || nmin >= nmax)
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return 0; /* invalid values */
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n = search_comment_item(conf, "dbmin");
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if (!n)
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return 0;
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if (config_integer(n, &odbmin) < 0)
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return 0;
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n = search_comment_item(conf, "dbmax");
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if (!n)
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return 0;
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if (config_integer(n, &odbmax) < 0)
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return 0;
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if (odbmin >= odbmax)
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return 0; /* invalid values */
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snd_ctl_elem_id_alloca(&id);
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snd_ctl_elem_info_get_id(info, id);
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if (snd_ctl_get_dB_range(handle, id, &ndbmin, &ndbmax) < 0)
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return 0;
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if (ndbmin >= ndbmax)
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return 0; /* invalid values */
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if (omin == nmin && omax == nmax &&
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odbmin == ndbmin && odbmax == ndbmax)
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return 0; /* OK, identical one */
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/* Let's guess the current value from dB range */
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if (snd_config_get_type(value) == SND_CONFIG_TYPE_COMPOUND) {
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snd_config_iterator_t i, next;
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snd_config_for_each(i, next, value) {
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snd_config_t *n = snd_config_iterator_entry(i);
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convert_to_new_db(n, omin, omax, nmin, nmax,
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odbmin, odbmax, ndbmin, ndbmax);
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}
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} else
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convert_to_new_db(value, omin, omax, nmin, nmax,
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odbmin, odbmax, ndbmin, ndbmax);
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return 0;
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}
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static int restore_config_value(snd_ctl_t *handle, snd_ctl_elem_info_t *info,
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snd_ctl_elem_iface_t type,
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snd_config_t *value,
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@ -1104,14 +1310,17 @@ static int set_control(snd_ctl_t *handle, snd_config_t *control)
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return -ENOENT;
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}
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#if 0
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if (comment) {
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check_comment_type(comment, type);
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if (type == SND_CTL_ELEM_TYPE_INTEGER ||
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type == SND_CTL_ELEM_TYPE_INTEGER64)
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check_comment_range(comment, info);
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if (check_comment_type(comment, type) < 0)
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error("incompatible field type for control #%d", numid);
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if (type == SND_CTL_ELEM_TYPE_INTEGER) {
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if (check_comment_range(handle, comment, info, value) < 0) {
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error("value range mismatch for control #%d",
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numid);
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return -EINVAL;
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}
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}
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}
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#endif
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if (!snd_ctl_elem_info_is_writable(info))
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return 0;
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@ -27,7 +27,9 @@ AC_PROG_CC
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dnl AC_PROG_CXX
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AC_PROG_INSTALL
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AC_PROG_LN_S
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AM_PATH_ALSA(1.0.12)
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AM_PATH_ALSA(1.0.15)
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AC_CHECK_FUNC(snd_tlv_get_dB_range,,
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AC_ERROR([No TLV support code in alsa-lib]))
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AC_ARG_ENABLE(alsamixer,
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[ --disable-alsamixer Disable alsamixer compilation],
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